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B3279X Series Capacitors

B3279X series capacitors feature capacitance ranges from 2 to 75μF

EPCOS presents a new series of AC capacitors with capacitance ranges from 2 to 75μF and radial terminals for PCB mounting. B3279X series output filter capacitors feature types for voltages up to 400VAC and can be used in a wide range of output filter modules. Higher capacitance values can be realized by placing several capacitors in parallel in the PCB assembly, thus allowing filter designers and manufacturers to design power converters even up to 500 kW with modular systems. Compared to other AC filtering solutions, the B3279X series offers smaller size with higher capacitance values, higher current density per capacitance and volume, and operation at temperatures up to 105 °C.

Power electronic designers are implementing more and more complex switching algorithms for pulse-width modulation (PWM) to gain efficiency and power quality. Such designs, however, introduce higher frequencies and harmonics into systems, which must be properly filtered by using LC and LCL filters at the output of the frequency converters. Applications for the new series are, in particular, in star-connected LCL circuits of three-phase power converters (DC/AC or AC/AC) for drives. Additional applications include inverters for solar power as well as UPS systems and discrete filters. The capacitors can also be used in single-phase systems. Datasheet
B3279X Series

  • Smaller size - higher capacitance
  • Higher current density per capacitance and volume
  • Automated high-volume production
  • Modular EMC filter designs possible
  • Operating temperature up to 105 °C


Technology MKP wound High voltage test 1.5 kVrms (AC), 10s
Capacitance range 2.0μF to 75μF Max operating temperature 105 °C
Lead spacing 27.5mm to 52.5mm Max continuous AC voltage [50/60 Hz] 250, 300, 350, 400 Vrms

B3279 Typical Application
A typical application is an output filter module (e.g. LCL) in star connection in a three-phase power converter (DC/AC or AC/AC). The capacitors can also be used in single-phase systems.

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Digi-Key P/N Manufacturer P/N Description
495-4132-ND B32794D2255K CAP 2.5UF 250VAC METAL POLYPRO
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495-4136-ND B32794D2156K CAP 15UF 250VAC METAL POLYPRO
495-4138-ND B32794D3335K CAP 3.3UF 300VAC METAL POLYPRO
495-4140-ND B32794D3805K CAP 8.0UF 300VAC METAL POLYPRO
495-4142-ND B32796E2226K CAP 22UF 250VAC METAL POLYPRO
495-4144-ND B32796E2256K CAP 25UF 250VAC METAL POLYPRO
495-4146-ND B32796E2406K CAP 40UF 250VAC METAL POLYPRO
495-4152-ND B32796E3306K CAP 30UF 300VAC METAL POLYPRO
495-4154-ND B32798G2756K CAP 75UF 250VAC METAL POLYPRO
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