DATASHEETEMC/EMI ProductsFN 409
75 VDC Input PCB Filter
Rated currents from 3 to 13 A, 75 VDCVery compact PCB-mounting designExceptional attenuation performanceHigh frequency noise compressionPerformance indicatorsTechnical specificationsMaximum continuous operating voltage75 VRated currents3 to 13 AHigh potential test voltageVI1/VI2 –> GND 1500 VDC for 2 secVI1 –> VI2 100 VDC for 2 secTemperature range (operation and storage)-40 °C to +100 °C (40/100/21)Design corresponding toUL 1283, CSA 22.2 No. 8 1986, IEC/EN 60939Flammability corresponding toUL 94 V-0MTBF @ 40°C/230 V (Mil-HB-217F)4,450,000 hoursApprovals
FN 409 PCB filters are designed to surpress commonand differential-mode noise on DC voltage lines. Thesuppression performance is special designed to fulfillthe requirements for high frequency switching DC/DC converter modules. FN 409 filters can also be usedto filter the output current of switch-mode powersupplies in applications with intelligent powerdistribution.
Features and benefits
High common and differential-mode noisesuppressionRated currents up to 13 A at 75 VDCSmall form factorGood thermal conductance
Typical applications
Input or output filter for high frequency DC/DCconvertersDC output filter for switch-mode power suppliesComputer and office automation equipmentTelecom equipmentInput/output filter within DC power distributionnetworks
Typical electrical schematic
2EMC/EMI ProductsSchaffner GroupDatasheets11 Oct 2018Filter selection table
FilterRated currentInductanceCapacitanceDC Resistance RInput/OutputWeight@ 50 °C (40 °C)LL1CxCy@ 25 °C per pathconnections[A][mH][mH][nF][nF][mΩ][g]FN 409-3-023 (3.2)2.947004.786-0230FN 409-6.5-026.5 (7)0.547004.718-0230FN 409-13-0213 (14)0.080.1847004.77.8-0247
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 data3 and 6.5 A types13 A types
All dimensions in mm; 1 inch = 25.4 mmTolerances according: ISO 2768-m / EN 22768-m
3EMC/EMI ProductsSchaffner GroupDatasheets11 Oct 20183 A6.5 A13 AA515150.8B27.927.940.6C8.28.212.7DØ0.8Ø0.85.1E0.50.5Ø1F11.711.70.5G3.93.93.8H12.112.16.4I31.131.117.8J4.64.625.4K19.0519.055.08DimensionsApplication
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 avaristor (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, shouldbe maintained within the rated voltage range.
Figure 1: transient protection with a varistor
Recommended layout
Note: avoid routing signal tracks or planes under the filter modulePlease visit www.schaffner.com to find more details on filter connectors.
Figure 2: transient protection with a transient diode
4EMC/EMI ProductsSchaffner GroupDatasheets11 Oct 2018
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