Schaffner-FN409-3-02

DATA

SHEET  

PCB Filters FN 409  

75 VDC Input PCB Filter  

Rated currents from 3 to 13 A, 75 VDC  

Very compact PCB-mounting design  

Exceptional attenuation performance  

High frequency noise compression  

Approvals  

FN 409 PCB filters are designed to surpress common  

and differential-mode noise on DC voltage lines. The  

suppression performance is special designed to fulfill  

the requirements for high frequency switching  

DC/DC converter modules. FN 409 filters can also be  

used to filter the output current of switch-mode  

power supplies in applications with intelligent power  

distribution.  

Features and benefits  

High common and differential-mode noise  

suppression  

Rated currents up to 13 A at 75 VDC  

Small form factor  

Good thermal conductance  

Typical applications  

Technical specifications  

Input or output filter for high frequency DC/DC  

converters  

Maximum continuous operating voltage  

Rated currents  

75 V  

DC output filter for switch-mode power supplies  

Computer and office automation equipment  

Telecom equipment  

3 to 13 A  

High potential test voltage  

VI1/VI2 –> GND 2000 VDC for 2 sec  

VI1 –> VI2 100 VDC for 2 sec  

-40 °C to +100 °C (40/100/21)  

UL 1283, CSA 22.2 No. 8 1986, IEC/EN 60939  

UL 94 V-0  

Temperature range (operation and storage)  

Design corresponding to  

Input/output filter within DC power distribution  

networks  

Flammability corresponding to  

MTBF @ 40°C/230V (Mil-HB-217F)  

4,450,000 hours  

Typical electrical schematic  

2

EMC/EMI Products  

Schaffner Group

 

Datasheets

2014  

Filter selection table  

Filter  

Rated current  

@ 50 °C (40 °C)  

Inductance  

Capacitance  

DC Resistance R  

@ 25 °C per path  

Input/Output  

connections  

Weight  

L

L1  

Cx  

Cy  

[A]  

3 (3.2)  

6.5 (7)  

13 (14)  

[mH]  

2.9  

[mH]  

[nF]  

4700  

4700  

4700  

[nF]  

4.7  

[mΩ]  

86  

[g]  

30  

30  

47  

FN 409-3-02  

FN 409-6.5-02  

FN 409-13-02  

-02  

-02  

-02  

0.5  

4.7  

18  

0.08  

0.18  

4.7  

7.8  

Typical filter attenuation  

Per CISPR 17; A = 50 Ω/50 Ω sym; B = 50 Ω/50 Ω asym; C = 0.1 Ω/100 Ω sym; D = 100 Ω/0.1 Ω sym  

3 A types  

6.5 A types  

13 A types  

Mechanical data  

3 and 6.5 A types  

13 A types  

All dimensions in mm; 1 inch = 25.4 mm  

Tolerances according: ISO 2768-m / EN 22768-m  

3

EMC/EMI Products  

Schaffner Group

 

Datasheets

2014  

Dimensions  

3 A  

51  

6.5 A  

51  

13 A  

A

B

C

D

E

F

G

H

I

50.8  

40.6  

12.7  

5.1  

27.9  

8.2  

27.9  

8.2  

Ø0.8  

0.5  

Ø0.8  

0.5  

Ø1  

11.7  

3.9  

11.7  

3.9  

0.5  

3.8  

12.1  

31.1  

4.6  

12.1  

31.1  

4.6  

6.4  

17.8  

25.4  

5.08  

J

K

19.05  

19.05  

Application  

The filters are intended to be used in DC applications per EN/IEC 60950, where no transient on the DC bus occurs. To protect the filter against transient voltages a  

varistor (VDR, fig. 1) or a transient diode (fig. 2) must be placed at the input side of the filter module.  

For protection against overcurrent place a fuse on each input lead (VI+, VI-). When AC voltage is superimposed on DC voltage, VP-P or VO-P, whichever is larger,  

should be maintained within the rated voltage range.  

Figure 2: transient protection with a transient diode  

Figure 1: transient protection with a varistor  

Recommended layout  

Note: avoid routing signal tracks or planes under the filter module  

4

EMC/EMI Products  

Schaffner Group

 

Datasheets

2014  

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