Littelfuse-HE721A1240

Reed Relay

Datasheet  

HE700  

Miniture Dual In-line Reed Relay  

Description  

The HE700 is a miniature reed relay in a DIL package with a choice  

of normally open, normally open high voltage, normally closed or  

changeover contacts capable of switching up to 300Vdc at 10W. It  

is available with 5V, 12V, and 24V coils and diode suppression and  

also available with magnetic shield option.  

Features  

■

Miniature dual in-line package  

■

Diode suppression option  

■

RoHS Compliant  

■

Optional coil suppression  

diode to protect coil drive  

circuits  

■

UL Recognized to UL 508 as  

an Industrial Control Switch  

■

External magnetic shield  

option  

Benefits  

■

One relay, various contacts  

choices reducing space and  

cost without compromising  

flexibility  

■

Hermetically sealed switching  

contact is immune to the  

effects of its environment  

Additional Information  

■

T

r

ansfer molded package  

gives maximum component  

protection  

■

Lower power coil  

consumption than competing  

electromechanical devices.  

Applications  

■

Security Systems  

■

Industrial Equipments  

■

Instrumentation  

■

T

e

lecom Equipments  

■

Process Control Systems  

Agency Approvals  

Agency  

Agency File Number  

E47258  

Note:

Not all parts are UL Recognized.

 

Contact Littelfuse for specific parts and agency approval ratings.  

© 2020 Littelfuse, Inc.  

Specifications are subject to change without notice.  

Revised: BA.12/16/20  

1

Reed Relay

Datasheet  

HE700  

Miniture Dual In-line Reed Relay  

Dimensions  

Dimensions in mm (inch)  

Relay Type  

Body Type  

L

W

H

Transfer Molded  

External Shield  

19.05 (.750)  

20.14 (.793)  

7.22 (.284)  

7.62 (.300)  

5.50 (.217)  

5.82 (.229)  

HE700  

HE700  

HE751  

HE700 (All)  

19.05  

(.750)  

20.14  

(.793)  

W

H

H

0.51  

(.020)  

0.51  

10.16 NOM.  

(.400)  

10.16 NOM.  

(.020)  

(.400)  

0.25 NOM.  

0.51NOM.  

(.020)  

0.51NOM.  

(.020)  

(.010)  

3.00 NOM.  

(.118)  

3.00 NOM.  

(.118)  

15.24 NOM.  

(.600)  

15.24 NOM.  

(.600)  

9.52  

(.375)  

T

a

ble 2: Electrical and Operating Characteristics @ 25°C  

Contact Type  

Form A SPST,

 

Form C SPDT-CO  

Form A SPST  

High Voltage  

Form B SPST-NC  

Standard  

DPST Standard  

Standard  

Characteristics  

Relay Types  

HE721, HE722  

HE721C/E/R  

HE751  

HE721  

Power, Switching  

Voltage, Switching

2  

Watt – max.  

10  

5

10  

10  

Vdc – max.  

Vac – max.  

Adc – max.  

Aac – max.  

200  

140  

0.5  

175  

120  

0.25  

0.18  

300  

265  

0.5  

200  

140  

0.5  

Contact Rating

1  

Current, Switching

3  

Current, Carry  

0.35  

0.35  

0.35  

Adc – max.  

1.2  

1.5  

1.2  

1.5  

Across Open Contacts  

Contacts to Coil  

Coil to E. Shield  

Between Isolated Terminals  

250  

500  

150  

500  

200  

500  

150  

N/A  

450  

4000  

N/A  

250  

500  

N/A  

N/A  

Voltage Hold-off

4  

Vdc/Vac Peak – min.  

N/A  

Contact, Initial  

Insulation Across Open Contacts  

Insulation Between Isolated Terminals  

Ω max.  

Ω min.  

Ω min.  

0.150  

10

10  

0.200  

10

10  

0.150  

10

10  

0.150  

10

10  

Resistance  

Timing  

10

10  

10

10  

10

10  

10

10  

Operate Time  

Release Time  

ms – max.  

ms – max.  

1.0  

1.0  

3.0  

3.0  

1.0  

1.0  

1.0  

1.0  

Temperature, Operating  

Temperature, Storage

5  

Vibration Resistance  

Shock Resistance  

°C  

°C  

-40 to +85  

-40 to +105  

20  

-40 to +85  

-40 to +105  

20  

-20 to +85  

-40 to +105  

20  

-40 to +85  

-40 to +105  

20  

Environmental  

G – max. 10-2000 Hz.  

G – max. 11 ms ½ sine  

50  

50  

50  

50  

Notes:  

1.

Contact rating – Product of the switching voltage and current should never exceed the wattage rating. Contact Littelfuse for additional load/lofe information.  

2.

When switching inductive and/or capacitive loads, the effects of transient voltages and/or currents should be considered. Refer to Application Notes AN108A & AN107 for details.  

3.

Electrical Load Life Expectancy – Contact Littelfuse with voltage current values along with type of load.  

4.

Breakdown Voltage – Per MIL-STD-202, Method 301.  

5.

Storage Temperature – Long time exposure at elevated temperature may degrade solderability of the leads.  

Part Numbering System  

HE7X – X – X – X – XX  

Model Number  

HE72 – Standard  

HE75 – High

 

Voltage  

General Options  

00 – No Options  

10 – Coil Suppression Diode  

20 – Electrostatic Shield  

30 – Coil Diode and E.S. Shield  

40 – External Magnetic Shield  

50 – External Magnetic Shield and Diode  

Number of Contacts  

1 and 2  

Contact

T

y

pe  

A – Form A (SPS

T

–

NO or DPS

T

–

NO)  

B – Form B (SPS

T

–

NC)  

C – Form C (SPD

T

–

CO)  

E – Form C (SPD

T

–

CO) alternate foot print 1  

R – Form C (SPD

T

–

CO) alternate foot print 2  

Standard Coil  

05 – 5 Volt  

12 – 12 Volt  

24 – 24 Volt  

Note:

Not all combinations of Part Number suffixes are available.

 

Contact Littelfuse for details.  

© 2020 Littelfuse, Inc.  

Specifications are subject to change without notice.  

Revised: BA.12/16/20  

2

Reed Relay

Datasheet  

HE700  

Miniture Dual In-line Reed Relay  

T

a

ble 3: Coil Characteristics @ 25°C  

Nominal  

Coil  

Voltage  

Vdc  

Coil  

Resistance  

1ꢀ0  

Maximum  

Coil  

Voltage  

Vdc  

Electrical and  

Contact  

Must  

Operate Release  

Vdc  

Must  

Top View 2.54mm (ꢀ.1″) Grid  

Dot on Case: Pin 1  

Numbers not printed on case.  

Operating  

Dimensions Part

 

Number  

Form  

Characteristics  

Vdc  

Ohms  

14 13  

9

8

E.S.  

E.S.  

E.S.  

E.S.  

E.S.  

E.S.  

HE721A0500  

HE721A1200  

HE721A2400  

5

12  

24  

500  

1000  

2150  

3.75  

8.0  

16.0  

0.5  

1.0  

2.0  

12  

31  

46  

1A  

SPST-NO  

See Table 2  

Column 1  

Figure 1  

Figure 1  

Figure 1  

Figure 1  

Figure 1  

Figure 1  

Figure 2  

2

6

7

1

14 13  

9

8

HE721B0500  

HE721B1200  

HE721B2400  

5

12  

24  

500  

500  

2150  

3.75  

9.0  

18.0  

0.5  

1.0  

2.0  

6.5

1,2  

14

1,2  

28

1,2  

1B  

SPST-NC  

See Table 2  

Column 4  

2

6

7

1

14 13  

9

8

HE721C0500  

HE721C1200  

HE721C2400  

5

12  

24  

200  

500  

2000  

3.75  

8.0  

16.0  

0.5  

1.0  

2.0  

14  

22  

44  

1C  

SPDT-CO  

See Table 2  

Column 2  

2

6

7

1

14 13  

9

8

HE721E0500  

HE721E1200  

HE721E2400  

5

12  

24  

200  

500  

2000  

3.75  

8.0  

16.0  

0.5  

1.0  

2.0  

14  

22  

44  

1C  

SPDT-CO  

See Table 2  

Column 2  

2

6

7

1

14 13  

9

8

HE721R0500  

HE721R1200  

HE721R2400  

5

12  

24  

200  

500  

2000  

3.75  

8.0  

16.0  

0.5  

1.0  

2.0  

14  

22  

44  

1C  

SPDT-CO  

See Table 2  

Column 2  

2

6

7

1

14 13  

9

8

HE722A0500  

HE722A1200  

HE722A2400  

5

12  

24  

200  

500  

2150  

3.75  

8.0  

16.0  

0.5  

1.0  

2.0  

12  

22  

46  

2A  

DPST-NO  

See Table 2  

Column 1  

2

6

7

1

14  

9

8

1A  

HE751A0500  

HE751A1200  

HE751A2400  

5

12  

24  

500  

1000  

2150  

3.75  

8.0  

16.0  

0.5  

1.0  

2.0  

12  

31  

46  

See Table 2  

Column 3  

SPST-NO  

High Voltage  

2

6

Notes:  

1.

HE721B – Exceeding recommended voltage may cause contact reclosure.  

2.

Optional external magnetic shield not available on Form B relays.  

HE7ꢀꢀ PCB Layout (Botto

m

V

iew)  

Packaging  

Quantity  

&

Packaging Code  

Ø0.61 HOLE  

(.024)  

Packaging  

Option  

Packaging  

Specification  

Quantity  

Taping Width  

2.54  

(.100)  

Bulk  

Bulk  

1000/5000  

N/A  

N/A  

12.70  

(.500)  

15.24  

(.600)  

7.62  

(.300)  

Disclaimer Notice –

Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications.

 

Littelfuse products are  

not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at

.  

© 2020 Littelfuse, Inc.  

Specifications are subject to change without notice.  

3

Revised: BA.12/16/20