KEMET-UB2-12NUN-L

Miniature Signal Relays  

UA2/UB2  

Overview  

Applications  

The KEMET UA2/UB2 miniature signal relays offer a super  

compact case size in a slim package. Minimal board space  

is consumed with either a through-hole or surface mount  

configuration.ꢀTheseꢀrelaysꢀareꢀrecognizedꢀbyꢀULꢀandꢀCSA,ꢀ  

while also being compliant with Part 68 of the FCC’s 1,500  

V surge capacity.  

• Electronic

 

switching systems  

• PBX  

• Terminal

 

equipment  

• Telephone

 

systems  

Benefits  

• Low

 

power consumption (< 140 mW)  

• Super

 

compact and lightweight  

• Slim

 

package for dense mounting  

• Low

 

magnetic interference  

• Tube

 

or embossed tape and reel packaging  

•ꢀ ULꢀrecognizedꢀ(E73266)ꢀandꢀCSAꢀcertifiedꢀ(LR46266)  

• Surface

 

mount and through-hole options  

Part Number System  

UB2-  

3

S

NU  

Lead Type  

-L  

Series  

Coil Voltage  

Latch Type  

Packaging  

UA2- = Through-hole mount

 

3 = 3 VDC  

UB2- = Surface mount  

Blank = Non-latch type  

4.5 = 4.5 VDC

 

S = Single coil latch type

 

NE = Low power consumption (Non-latch)  

NU = Standard  

Blank = Tube  

-L = Embossed tape on reel  

5 = 5 VDC  

NUN = Minimum footprint  

9 = 9 VDC  

12 = 12 VDC  

24 = 24 VDC  

NEN = Low power consumption (Non-latch),  

Minimum footprint  

NZF = High capability with switch and  

carrying current at 2A  

Built Into Tomorrow  

© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard  

R7004_UA2_UB2 • 12/7/2020  

1

Miniature Signal Relays – UA2/UB2  

Dimensions – Millimeters  

UA2 Series  

B Maximum  

D Maximum  

H Maximum  

K

0.5  

0.4  

0.2  

1.5  

1.5  

3.2 P

1

P

1  

P

2  

UB2 Series  

B Maximum  

D Maximum  

H Maximum  

1.5  

0.2  

0.4  

1.5  

P

2  

P

3  

3.2 P

1

P

1  

Series  

D

H

B

P

1  

P

2  

P

3  

K

UA2 (NU, NE)  

UB2 (NU, NE)  

UB2 (NUN, NEN)  

UB2 (NZF)  

10.6  

10.6  

10.6  

10.6  

8.0  

8.8  

9.0  

8.8  

5.7  

5.7  

5.7  

5.7  

2.2  

2.2  

2.2  

2.2  

3.2  

3.2  

3.2  

3.2  

—

3.4  

—

7.4  

5.7  

5.7  

—

—

General tolerance: ±0.3  

Tolerance of lead pitch: ±0.15  

© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard  

R7004_UA2_UB2 • 12/7/2020  

2

Miniature Signal Relays – UA2/UB2  

Pin Configurations  

Bottom view  

Single coil latch type  

(Reset position)  

Non-latch type  

(Non-energized position)  

1

2

3

4

1

2

3

4

+

–

+ –  

S R  

– +  

8

7

6

5

8

7

6

5

S: Coil polarity for Set  

R: Coil polarity for Reset  

Safety Standards and Ratings  

Certification Body  

Mark  

Specification  

File Number  

Rating  

UL Recognized  

(UL508)

1  

UL  

E73266  

30 VDC, 1 A (resistive)  

110 VDC, 0.3 A (resistive)  

125 VAC, 0.5 A (resistive)  

CSAꢀCertified  

(CSA 22.2 #14)  

CSA  

LR46266  

Certification Body  

Mark  

Specification  

File Number  

Class  

Rating  

Creepage and clearance of coil to  

contact is more than 2 mm  

(According to EN60950)  

TUVꢀCertified  

(EN61810)  

TUV  

2050596  

Basic insulation  

Environmental Compliance  

All KEMET relays are RoHS Compliant.  

© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard  

R7004_UA2_UB2 • 12/7/2020  

3

Miniature Signal Relays – UA2/UB2  

Table 1 – Ratings & Part Number Reference  

Part Number  

Nominal Coil Voltage  

Lead Type  

Packaging  

() Designates Latch Type  

(VDC)  

UA2-3(1)NU  

UA2-4.5(1)NU  

UA2-5(1)NU  

UA2-12(1)NU  

UA2-24NU

1  

3

4.5  

5

12  

24  

3

4.5  

5

3

Radial  

Radial  

Radial  

Radial  

Radial  

Tube  

Tube  

Tube  

Tube  

Tube  

Tube  

Tube  

Tube  

Tube  

UA2-3NE

1  

Radial, Low power consumption  

Radial, Low power consumption  

Radial, Low power consumption  

Surface mount  

UA2-4.5NE

1  

UA2-5NE

1  

UB2-3(1)NU  

UB2-4.5(1)NU  

UB2-5(1)NU  

4.5  

5

Surface mount  

Surface mount  

Tube  

Tube  

UB2-12(1)NU  

12  

24  

3

4.5  

5

3

4.5  

5

12  

24  

3

4.5  

5

3

4.5  

5

12  

24  

3

4.5  

5

3

4.5  

5

12  

24  

3

4.5  

5

Surface mount  

Surface mount  

Surface mount, Low power consumption  

Surface mount, Low power consumption  

Surface mount, Low power consumption  

Surface mount  

Tube  

Tube  

Tube  

Tube  

UB2-24NU

1  

UB2-3NE

1  

UB2-4.5NE

1  

UB2-5NE

1  

Tube  

UB2-3(1)NU-L  

UB2-4.5(1)NU-L  

UB2-5(1)NU-L  

UB2-12(1)NU-L  

UB2-24NU-L

1  

UB2-3NE-L

1  

Tape on Reel  

Tape on Reel  

Tape on Reel  

Tape on Reel  

Tape on Reel  

Tape on Reel  

Tape on Reel  

Tape on Reel  

Tube  

Surface mount  

Surface mount  

Surface mount  

Surface mount  

Surface mount, Low power consumption  

Surface mount, Low power consumption  

Surface mount, Low power consumption  

Surface mount, Minimum footprint  

Surface mount, Minimum footprint  

Surface mount, Minimum footprint  

Surface mount, Minimum footprint  

Surface mount, Minimum footprint  

Surface mount, Low power consumption, Minimum Footprint  

Surface mount, Low power consumption, Minimum Footprint  

Surface mount, Low power consumption, Minimum Footprint  

Surface mount, Minimum footprint  

Surface mount, Minimum footprint  

Surface mount, Minimum footprint  

Surface mount, Minimum footprint  

Surface mount, Minimum footprint  

Surface mount, Low power consumption, Minimum Footprint  

Surface mount, Low power consumption, Minimum Footprint  

Surface mount, Low power consumption, Minimum Footprint  

Surface mount, Low power consumption, Minimum Footprint,  

High capability with switch and carrying current at 2A  

UB2-4.5NE-L

1  

UB2-5NE-L

1  

UB2-3(1)NUN  

UB2-4.5(1)NUN  

UB2-5(1)NUN  

UB2-12(1)NUN  

UB2-24NUN

1  

UB2-3NEN

1  

Tube  

Tube  

Tube  

Tube  

Tube  

Tube  

Tube  

UB2-4.5NEN

1  

UB2-5NEN

1  

UB2-3(1)NUN-L  

UB2-4.5(1)NUN-L  

UB2-5(1)NUN-L  

UB2-12(1)NUN-L  

UB2-24NUN-L

1  

UB2-3NEN-L

1  

UB2-4.5NEN-L

1  

UB2-5NEN-L

1  

Tape on Reel  

Tape on Reel  

Tape on Reel  

Tape on Reel  

Tape on Reel  

Tape on Reel  

Tape on Reel  

Tape on Reel  

Emboss carrying tape with  

Moisture Barrier Bag  

Emboss carrying tape with  

Moisture Barrier Bag  

Emboss carrying tape with  

Moisture Barrier Bag  

Emboss carrying tape with  

Moisture Barrier Bag  

Emboss carrying tape with  

Moisture Barrier Bag  

UB2-3(1)NZF-L7  

UB2-4.5(1)NZF-L7  

UB2-5(1)NZF-L7  

UB2-9(1)NZF-L7  

UB2-12(1)NZF-L7  

UB2-24(1)NZF-L7  

3

4.5  

5

Surface mount, Low power consumption, Minimum Footprint,  

High capability with switch and carrying current at 2A  

Surface mount, Low power consumption, Minimum Footprint,  

High capability with switch and carrying current at 2A  

Surface mount, Low power consumption, Minimum Footprint,  

High capability with switch and carrying current at 2A  

Surface mount, Low power consumption, Minimum Footprint,  

High capability with switch and carrying current at 2A  

9

12  

24  

Surface mount, Low power consumption, Minimum Footprint,  

High capability with switch and carrying current at 2A  

Emboss carrying tape with  

Moisture Barrier Bag  

Part Number  

Nominal Coil Voltage  

Lead Type  

Packaging  

(1) To complete KEMET part number, leave blank for Non-latch or insert S for Single coil. Designates latch type.  

© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard  

R7004_UA2_UB2 • 12/7/2020  

4

Miniature Signal Relays – UA2/UB2  

Land Pattern – Millimeters  

UA2 Series (bottom view)  

7.6  

2.2 2.2  

1.5  

1.5  

8 – ø 0.85  

3.2  

V

UB2 Series (top view)  

7.6  

1.5  

1.5  

3.2  

2.2 2.2  

V

X

1.11  

Series  

UA2 (NU, NE)  

V

X

—

3.2  

5.3  

4.6  

UB2 (NU, NE)  

3.1  

2.25  

UB2 (NUN, NEN)  

© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard  

R7004_UA2_UB2 • 12/7/2020  

5

Miniature Signal Relays – UA2/UB2  

Soldering Process  

UA2 – Through-hole Mounting  

Automatic Soldering  

Preheating: 110–120°C/110 seconds (maximum)  

Solder temperature: 260°C maximum  

Solder time: 5 seconds maximum  

Note: KEMET recommends cooling down a printed circuit board to less than 110°C within 40 seconds after soldering.  

Manual Soldering  

Solder temperature: 350°C maximum  

Solder time: 3 seconds maximum  

UB2 – Surface Mounting  

IRS Method  

Temperature  

(˚

C)  

Maximum 240

˚

C  

220  

200  

180  

45 (Maximum 70)  

Time (seconds)  

70 (Maximum 120)  

190 (Maximum 300)  

ꢀ

ꢀ

Note:ꢀTemperatureꢀprofileꢀshowsꢀprintedꢀcircuitꢀboardꢀsurfaceꢀtemperatureꢀonꢀtheꢀrelayꢀterminalꢀportion.  

PleaseꢀconsultꢀKEMETꢀifꢀyouꢀwishꢀtoꢀuseꢀaꢀtemperatureꢀprofileꢀotherꢀthanꢀabove.  

© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard  

R7004_UA2_UB2 • 12/7/2020  

6

Miniature Signal Relays – UA2/UB2  

Contact Specifications  

Item  

UA2/UB2  

Contact Form  

2 Form C  

Contact Material  

Silver alloy with gold alloy overlay  

30 W, 37.5 VA  

Maximum Switching Power  

Maximum Switching Voltage  

Maximum Switching Current  

Maximum Carrying Current  

220 VDC, 250 VAC  

1 A  

Contact Ratings  

1 A  

Minimum Contact Ratings  

Initial Contact Resistance  

Operating Time (excluding bounce)  

Release Time (excluding bounce)  

Insulation Resistance  

10 mVDC, 10 µA

*1  

100ꢀmΩꢀmaximumꢀ(initial)  

Approximately 2 milliseconds  

Approximately 1 milliseconds  

1,000ꢀMΩꢀatꢀ500ꢀVDC  

Between Open Contacts  

Between Adjacent Contacts  

Between Coil and Contacts  

1,000 VAC (for one minute), 1,500 V surge (10 x 160 µs)

*2  

1,000 VAC (for one minute), 1,500 V surge (10 x 160 µs)

*2  

1,500 VAC (for one minute), 2,500 V surge (2 x 10 µs)

*3  

Withstand Voltage  

735 m/s

2

(75 G) – misoperation  

Shock Resistance  

980 m/s

2

(100 G) – destructive failure  

10 to 55 Hz, double amplitude 3 mm (20 G) – misoperation  

10 to 55 Hz, double amplitude 5 mm (30 G) – destructive failure  

Vibration Resistance  

Ambient Temperature  

Coil Temperature Rise  

−40ꢀtoꢀ+85°C  

18°C at nominal coil voltage (140 mW)  

5 x 10

7

operations (Non-latch type)

*4  

Non-load  

Load  

1 x 10

7

operations (Latch type)  

RunningꢀSpecifications  

30 VDC 1 A (resistive), 1 x 10

5

operations at 20°C, 1 Hz  

125 VAC 0.3 A (resistive), 1 x 10

5

operations at 20°C, 1 Hz  

Weight  

Approximately 1 g  

and load.  

Coil Specifications  

Non-latch Type (at 20°C)  

Nominal Coil Voltage  

(VDC)  

Coil Resistance  

(Ω) ±10%  

Operating Voltage

1  

(VDC)  

Release Voltage

1  

(VDC)  

Nominal Operating  

Power (mW)  

3.0  

64.3  

145.0  

178.0  

579.0  

1028.0  

2504.0  

2.25  

3.38  

3.75  

6.75  

9.00  

18.00  

0.30  

0.45  

0.50  

0.90  

1.20  

2.40  

140  

140  

140  

140  

140  

230  

4.5  

5.0  

9.0  

12.0  

24.0  

© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard  

R7004_UA2_UB2 • 12/7/2020  

7

Miniature Signal Relays – UA2/UB2  

Coil Specifications cont.  

Single Coil Latch Type (at 20°C)

2  

Nominal Coil Voltage  

(VDC)  

Coil Resistance  

Operating Voltage

1  

(VDC)  

Reset Voltage

1  

(VDC)  

Nominal Operating  

Power (mW)  

(Ω) ±10%  

3.0  

4.5  

90.0  

202.5  

250.0  

810.0  

1440.0  

2.25  

3.38  

3.75  

6.75  

9.00  

2.25  

3.38  

3.75  

6.75  

9.00  

100  

100  

100  

100  

100  

5.0  

9.0  

12.0  

Non-latch, Low Power Consumption (NE, NEN) Type (at 20°C)  

Nominal Coil Voltage  

(VDC)  

Coil Resistance  

(Ω) ±10%  

Operating Voltage

1  

(VDC)  

Release Voltage

1  

(VDC)  

Nominal Operating  

Power (mW)  

3.0  

4.5  

5.0  

90.0  

202.5  

250.0  

2.25  

3.38  

3.75  

0.30  

0.45  

0.50  

100  

100  

100  

Recommended Relay Drive Conditions  

Coil Type  

Rating  

Ambient Temperature  

Non-latch  

Voltage:ꢀ≤ꢀ±5%ꢀofꢀnominalꢀvoltage  

Square pulse (rise and fall time is rapid)  

Pulseꢀheight:ꢀ≤ꢀ±5%ꢀofꢀnominalꢀvoltage  

Pulse Width: > 10 ms  

−40ꢀtoꢀ+85°C  

Single Coil  

Marking  

UA2 – Top View  

UB2 – Top View  

ꢀart ꢁuꢂꢃer  

ꢀart ꢁuꢂꢃer  

Manuꢄaꢅturer  

ꢉate ꢆꢇꢊe  

ꢉate ꢆꢇꢊe  

ꢉireꢅtiꢇn Marꢋ  

ꢌꢀin ꢁꢇꢍ ꢎ anꢊ ꢏꢐ  

ꢉireꢅtiꢇn Marꢋ  

ꢌꢀin ꢁꢇꢍ ꢎ anꢊ ꢏꢐ  

ꢆꢇuntry ꢇꢄ ꢈrigin  

ꢆꢇuntry ꢇꢄ ꢈrigin  

Manuꢄaꢅturer  

© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard  

R7004_UA2_UB2 • 12/7/2020  

8

Miniature Signal Relays – UA2/UB2  

Performance Data  

Coil Temperature Rise  

Temperature is measured by coil resistance  

Coil temperature  

Coil temperature  

Rise (°C )  

Rise (°C)  

Applied power 0.23W  

60  

30  

40  

20  

0

20  

10  

0

Applied power 0.14W  

Applied power 0.1W  

0

100  

200  

300  

0

5

10  

15  

20  

Applied power (mW)  

Applied time (minute)  

Switching Capacity  

Maximum Coil Voltage  

Maximum Values  

Maximum value of permissible alteration  

DC(Resistive)  

AC(Resistive)  

2.0  

200  

Ratio  

nomina  

coil  

voltage  

(%)  

Ratio of  

150  

1.0  

0.5  

Contact  

current (A)  

nominal  

coil  

voltage  

100  

(%)  

0.2  

0.1  

50  

10  

20  

50  

100  

-40 -20  

0

20 40  

60 80

 

100  

250VAC  

220VDC  

VAC  

Contact voltage (V)  

Ambient temperature (°C)  

0VDC  

Applied Voltage vs. Timing  

(Sample: UA2–5NU)  

(Without coil diode)  

4

4

3

2

1

3

Release  

time  

(ms)  

Operate  

2

time  

(ms)  

1

0

0

0

100  

150  

200  

250  

0

100  

200  

300  

400  

Applied power (mW)  

Applied power (mW)  

© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard  

R7004_UA2_UB2 • 12/7/2020  

9

Miniature Signal Relays – UA2/UB2  

Performance Data cont.  

Operate and Release Voltage vs. Ambient Temperature  

This shows a typical change of operate (release) voltage. The value of must operate is estimated, so coil voltage must be  

applied higher than this value for safe operation. For hot start operation, please inquire with KEMET.  

100  

Must operate voltage  

80  

60  

40  

20  

0

Operate voltage (typical)  

Ratio of nominal  

coil voltage (%)  

Release voltage (typical)  

-40  

-20  

0

20  

40  

60  

80  

100  

Ambient temperature (°C)  

Running Test (Non-load)  

(Load:ꢀnone;ꢀDrive:ꢀ5ꢀVDC,ꢀ50ꢀHz,ꢀ50%ꢀduty;ꢀAmbientꢀTemperature:ꢀroomꢀtemperature;ꢀSample:ꢀUA2–5NU,ꢀ20ꢀpieces)  

10000  

5

Operate voltage  

Release voltage  

1000  

100  

10  

4

3

2

1

0

Contact  

resistance  

(m

Ω

)  

Operate  

voltage  

(V)  

Release  

voltage  

(V)  

0

20  

50  

100  

500  

1000  

0

20  

50  

100  

500  

1000  

Operations (

×

10

4

)  

Operations (

×

10

4

)  

Running Test (Load)  

(Load:ꢀ50ꢀVDC,ꢀ0.1ꢀAꢀresistive;ꢀDrive:ꢀ5ꢀVDC,ꢀ5ꢀHz,ꢀ50%ꢀduty;ꢀAmbientꢀTemperature:ꢀ85°C;ꢀSample:ꢀUA2–5NU,ꢀ10ꢀpieces)  

5

4

3

2

1

0

10000  

1000  

100  

Operate voltage  

Contact  

resistance  

(m

Ω

)  

Operate  

voltage  

(V)  

Release voltage  

Release  

0

2

5

10  

50  

100  

10  

Operations (

×

10

4

)  

0

2

5

10  

50  

100  

Operations (

×

10

4

)  

© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard  

R7004_UA2_UB2 • 12/7/2020  

10  

Miniature Signal Relays – UA2/UB2  

Performance Data cont.  

Breakdown Voltage  

(Sample: UA2–5NU, 10 pieces)  

(a) Between open contacts  

(b) Between adjacent contacts  

100  

100  

50  

50  

0

Distribution  

Distribution (%)  

0

0.5  

1.0  

1.5  

2.0  

1.0  

1.5  

2.0  

2.5  

Breakdown voltage (K V)  

Breakdown voltage (K V)  

(C) Between coil and contact  

100  

50  

0

Distribution (%)  

1.5  

2.0  

2.5  

2.5over  

Breakdown voltage (K V)  

Alteration of Voltage in Dense Mounting  

(magnetic interference)  

Alternation of operate voltage  

Alternation of operate voltage  

+40  

+30  

+20  

+10  

0

+40  

+30  

+20  

+10  

0

Ratio of  

Ratio of  

alternation (%)  

alternation (%)  

-10  

-20  

-30  

-40  

-10  

-20  

-30  

-40  

a

b

c

d

e

f

a

b

c

d

e

f

Mounting layout  

Mounting layout  

Device under test  

OFF  

OFF  

ON  

ON  

OFF  

ON  

ON  

3mm  

2.5mm  

OFF  

d

a

b

c

ON  

ON  

ON  

OFF  

OFF  

OFF  

e

f

© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard  

R7004_UA2_UB2 • 12/7/2020  

11  

Miniature Signal Relays – UA2/UB2  

Tube Packing – Millimeters  

50 pieces/Tube (anti-static)  

15.5  

560  

Direction of relay direction mark  

10.1  

Rubber stopper (Green)  

Rubber stopper (Yellow)  

Tape & Reel Packaging Information (UB2 only) – Millimeters  

Appearance  

Reel  

800 pieces/Reel  

Reel diameter: 380mm  

Emboss  

Carrying tape  

Top cover tape  

max. 8.1  

A

Tape Dimensions  

1.75  

2.0  

0.4  

1

2

6  

4

Φ

1.5  

Φ

2.2  

Series  

NU-L, NE-L  

NUN-L, NEN-L  

A

B

8.2  

6.7  

11.5  

Maximum 9.4  

Maximum 9.5  

1

1

4

1

.

7

.4  

24.0  

1

2

B

.1  

Relay Direction Mark and Tape Carrying Direction  

Sprocket hole  

Direction mark  

Direction of unreeling  

© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard  

R7004_UA2_UB2 • 12/7/2020  

12  

Miniature Signal Relays – UA2/UB2  

Notes on Using Relays  

1. Contact Load  

Makeꢀsureꢀthatꢀtheꢀcontactꢀloadꢀisꢀwithinꢀtheꢀspecifiedꢀrange;ꢀotherwise,ꢀtheꢀlifetimeꢀofꢀtheꢀcontactsꢀwillꢀbeꢀshortenedꢀ  

considerably. Note that the running performance shown is an example, and that it varies depending on parameters such  

as the type of load, switching frequency, driver circuit, and ambient temperature under the actual operating conditions.  

2. Driving Relays  

•

Ifꢀtheꢀinternalꢀconnectionꢀdiagramꢀofꢀaꢀrelayꢀshowsꢀ+ꢀandꢀ-ꢀsymbolsꢀonꢀtheꢀcoil,ꢀapplyꢀtheꢀratedꢀvoltageꢀtoꢀtheꢀrelayꢀinꢀ  

theꢀspecifiedꢀdirection.ꢀIfꢀaꢀrippledꢀDCꢀcurrentꢀsourceꢀisꢀused,ꢀabnormalitiesꢀsuchꢀasꢀheatꢀatꢀtheꢀcoilꢀmayꢀoccur.  

• The

 

maximum voltage that can be applied to the coil of the relay varies depending on the ambient temperature.  

Generally, the higher the voltage applied to the coil, the shorter the operating time. Note, however, that high voltage  

also increases the bounce of the contacts and the contact opening and closing frequency, which may shorten the  

lifetime of the contacts.  

Nominal  

coil voltage  

0

<1msec.  

<1msec.  

• For

 

consistent operation, the driving voltage should have rise and fall times of less than 1 ms.  

•

Forꢀaꢀlatchingꢀrelay,ꢀapplyꢀaꢀvoltageꢀtoꢀtheꢀcoilꢀaccordingꢀtoꢀtheꢀpolarityꢀspecifiedꢀinꢀtheꢀinternalꢀconnectionꢀdiagramꢀofꢀ  

the relay.  

• If

 

a current is applied to the coil over a long period of time, the coil temperature rises, promoting generation of organic  

gas inside the relay, which may result in faulty contacts. In this case, use of a latching relay is recommended.  

• The

 

operating time and release time indicate the time required for each contact to close after the voltage has been  

applied to or removed from the coil. However, because the relay has a mechanical structure, a bounce state exists  

at the end of the operating and release times. Furthermore, because additional time is required until the contact  

stabilizes after being in a high-resistance state, care must be taken when using the relay at high speeds.  

3. Operating Environment  

•

Makeꢀsureꢀthatꢀtheꢀrelayꢀmountedꢀinꢀtheꢀapplicationꢀsetꢀisꢀusedꢀwithinꢀtheꢀspecifiedꢀtemperatureꢀrange.ꢀUseꢀofꢀaꢀrelayꢀ  

at a temperature outside this range may adversely affect insulation or contact performance.  

•

Ifꢀtheꢀrelayꢀisꢀusedꢀforꢀaꢀlongꢀperiodꢀofꢀtimeꢀinꢀhighlyꢀhumidꢀ(RHꢀ85%ꢀorꢀhigher)ꢀenvironment,ꢀmoistureꢀmayꢀbeꢀ  

absorbed into the relay. This moisture may react with the NOx and SOx generated by glow discharges that occur when  

the contacts are opened or closed, producing nitric or sulfuric acid. If this happens, the acid produced may corrode  

the metallic parts of the relay, causing operational malfunction.  

• If

 

any material containing silicon (silicon rubber, silicon oil, and silicon based coating material) is used in the  

neighborhood of relay, there is some possibility that these materials will emit silicon gas that will penetrate the  

relay. In this case, the switching contact may generate silicon compounds on the surface of contacts. This silicon  

compound may result in contact failure. Avoid use of relay in such an environment.  

© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard  

R7004_UA2_UB2 • 12/7/2020  

13  

Miniature Signal Relays – UA2/UB2  

Notes on Using Relays cont.  

• Because

 

the operating temperature range varies depending on the humidity, use the relay in the temperature range  

illustratedꢀinꢀtheꢀfigureꢀbelow.ꢀPreventꢀtheꢀrelayꢀfromꢀbeingꢀfrozenꢀandꢀavoidꢀtheꢀgenerationꢀofꢀcondensation.  

85  

80  

60  

Humidity  

(%RH)  

40  

20  

5

-60 -40 -20  

0 20 40

 

60 80

 

100  

T

e

mperature (

°C

)  

• The

 

relay maintains constant sealability under normal atmospheric pressure (810 to 1,200 hpa). Its sealability may  

be degraded or the relay may be deformed and malfunction if it is used under barometric conditions exceeding the  

specifiedꢀrange.  

• The

 

same applies when the relay is stored or transported. Keep the upper-limit value of the temperature to which the  

relay is exposed after it is removed from the carton box to within 50°C.  

• Permanent

 

magnets are used in polarized relays. For this reason, when magnets, transformers, or speakers are  

located nearby the relay characteristics may change and faulty operations may result.  

• If

 

excessive vibration or shock is applied to the relay, it may malfunction and the contacts remain closed. Vibration or  

shock applied to the relay during operation may cause considerable damage to or wearing of the contacts. Note that  

operation of a snap switch mounted close to the relay or shock due to the operation of magnetic solenoid may also  

cause malfunctioning.  

4. Mounting  

• When

 

mounting a relay onto a PC board using an automatic chip mounter, if excessive force is applied to the cover  

of the relay when the relay is chucked or inserted, the cover may be damaged or the characteristics of the relay  

degraded. Keep the force applied to the relay to within 1 kg.  

• Avoid

 

bending the pins to temporarily secure the relay to the PC board. Bending the pins may degrade sealability or  

adversely affect the internal mechanism.  

• Ventilation

 

immediately after soldering is recommended. Avoid immersing the relay in cleaning solvent immediately  

after soldering due to the danger of thermal shock being applied to the relay.  

• Use

 

an alcohol-based or water-based cleaning solvent. Never use thinner and benzene because they may damage the  

relay housing.  

• Do

 

not use ultrasonic cleaning because the vibration energy generated by the ultrasonic waves may cause the  

contacts to remain closed.  

© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard  

R7004_UA2_UB2 • 12/7/2020  

14  

Miniature Signal Relays – UA2/UB2  

Notes on Using Relays cont.  

5. Handling and Storage  

• Relays

 

are packaged in magazine cases for shipment. If a space is created in the case after some relays have been  

removed, be sure to insert a stopper to secure the remaining relays in the case. If relays are not well secured, vibration  

during transportation may cause malfunctioning of the contacts.  

• Exercise

 

care in handling the relay so as to avoid dropping it or allowing it to fall. Do not use a relay that has been  

dropped.ꢀIfꢀaꢀrelayꢀdropsꢀfromꢀaꢀworkbenchꢀtoꢀtheꢀfloor,ꢀaꢀshockꢀofꢀ9,800ꢀm/s

2

(1,000 G) or more is applied to the relay,  

possibly damaging its functions. Even if a light shock has been applied to the relay, thoroughly evaluate its operation  

before using it.  

• Latching

 

relays are factory-set to reset state for shipment. A latching relay may be set, however, by vibration or shock  

applied while being transported. Be sure to forcibly reset the relay before using it in the application set. Also note that  

the relay may be set by unexpected vibration or shock when it is used in a portable set.  

• The

 

sealability of a surface mount (SMT) relay may be lost if the relay absorbs and is then heated during soldering.  

When storing relays, therefore, observe the following points:  

1.

ꢀForꢀstandardꢀpacking,ꢀpleaseꢀuseꢀrelaysꢀwithinꢀ12ꢀmonthsꢀafterꢀdeliveryꢀ(storageꢀconditions:ꢀ30°C/60%ꢀRH).ꢀIfꢀtheꢀ  

relays have moisture absorption, dehumidify as follows:  

–ꢀTapeꢀPackaging:ꢀ50ꢀ±5°C,ꢀ200–300ꢀhours.  

–ꢀSimpleꢀRelay:ꢀ85ꢀ±5°C,ꢀ48ꢀhours.  

2.

ꢀForꢀMBBꢀpacking,ꢀpleaseꢀuseꢀrelaysꢀwithinꢀ2ꢀyearsꢀafterꢀdeliveryꢀ(storageꢀconditions:ꢀ30°C/60%ꢀRH).ꢀAfterꢀ  

openingꢀMBBꢀpacking,ꢀpleaseꢀuseꢀwithinꢀ3ꢀmonthsꢀ(storageꢀconditions:ꢀ30°C/60%ꢀRH).  

© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard  

R7004_UA2_UB2 • 12/7/2020  

15  

Miniature Signal Relays – UA2/UB2  

KEMET Electronics Corporation Sales Offices  

Disclaimer  

Allꢀproductꢀspeci ꢀcations,ꢀstatements,ꢀinformationꢀandꢀdataꢀ(collectively,ꢀtheꢀ“Information”)ꢀinꢀthisꢀdatasheetꢀareꢀsubjectꢀtoꢀchange.ꢀTheꢀcustomerꢀisꢀresponsibleꢀforꢀ  

checking and verifying the extent to which the Information contained in this publication is applicable to an order at the time the order is placed. All Information given  

herein is believed to be accurate and reliable, but it is presented without guarantee, warranty, or responsibility of any kind, expressed or implied.  

StatementsꢀofꢀsuitabilityꢀforꢀcertainꢀapplicationsꢀareꢀbasedꢀonꢀKEMETꢀElectronicsꢀCorporation’sꢀ(“KEMET”)ꢀknowledgeꢀofꢀtypicalꢀoperatingꢀconditionsꢀforꢀsuchꢀ  

applications,ꢀbutꢀareꢀnotꢀintendedꢀtoꢀconstituteꢀ–ꢀandꢀKEMETꢀspeci ꢀcallyꢀdisclaimsꢀ–ꢀanyꢀwarrantyꢀconcerningꢀsuitabilityꢀforꢀaꢀspeci ꢀcꢀcustomerꢀapplicationꢀorꢀuse.ꢀ  

The Information is intended for use only by customers who have the requisite experience and capability to determine the correct products for their application. Any  

technical advice inferred from this Information or otherwise provided by KEMET with reference to the use of KEMET’s products is given gratis, and KEMET assumes no  

obligation or liability for the advice given or results obtained.  

Although KEMET designs and manufactures its products to the most stringent quality and safety standards, given the current state of the art, isolated component  

failures may still occur. Accordingly, customer applications which require a high degree of reliability or safety should employ suitable designs or other safeguards  

(such as installation of protective circuitry or redundancies) in order to ensure that the failure of an electrical component does not result in a risk of personal injury or  

property damage.  

Although all product–related warnings, cautions and notes must be observed, the customer should not assume that all safety measures are indicted or that other  

measures may not be required.  

When providing KEMET products and technologies contained herein to other countries,

 

the customer must abide by the procedures and provisions stipulated in all  

applicableꢀexportꢀlawsꢀandꢀregulations,ꢀincludingꢀwithoutꢀlimitationꢀtheꢀInternationalꢀTra ꢀꢀcꢀinꢀArmsꢀRegulationsꢀ(ITAR),ꢀtheꢀUSꢀExportꢀAdministrationꢀRegulationsꢀ  

(EAR) and the Japan Foreign Exchange and Foreign Trade Act.  

KEMET is a registered trademark of KEMET Electronics Corporation.  

© KEMET Electronics Corporation • KEMET Tower • One East Broward Boulevard  

R7004_UA2_UB2 • 12/7/2020  

16