B3272 DC-Link Film Capacitors

Introduction

TDK’s B3272 series is a range of metallized polypropylene (MKP) DC-link film capacitors for automotive and industrial power-electronics designs. The series combines high-voltage DC ratings from 800 VDC to 1200 VDC with capacitance values from 1 µF to 60 µF, high-current capability, and operation at temperatures up to +135°C.

The family is AEC-Q200E qualified and uses self-healing film-capacitor construction, making it relevant where DC-link energy storage and filtering must be accommodated in demanding electrical and thermal environments.

What it does

DC-link capacitors are used on a DC bus to support and stabilize the link between power-conversion stages. The B3272 series provides this function in a film-capacitor format with low losses and self-healing properties.

TDK offers the series in 2-pin, 4-pin, and low-profile variants, allowing designers to select a configuration suited to the mechanical and electrical arrangement of a power-electronics assembly. The capacitors use a flame-retardant plastic case with epoxy resin sealing; both materials are rated UL 94 V-0.

The specified no-derating temperature is up to +105°C, while the maximum operating temperature is +135°C. TDK specifies a useful life of 100,000 hours at rated voltage and +85°C.

Applications

Potential uses that follow from the series’ DC-link function, voltage range, and automotive/industrial focus include:

• DC-link stages in automotive power-electronics assemblies
• Industrial power converters operating from high-voltage DC buses
• DC-bus filtering and energy-storage positions in inverter systems
• High-current power-conversion equipment requiring film capacitors
• Compact converter layouts where low-profile capacitor variants are appropriate

Design considerations

The selected B3272 variant should be matched to the required capacitance and rated DC-bus voltage, with options spanning 1 µF to 60 µF and 800 VDC to 1200 VDC. Pin count and physical profile also need consideration: the series is available in 2-pin, 4-pin, and low-profile configurations.

Thermal requirements should be evaluated against the stated +105°C no-derating temperature and +135°C maximum operating temperature. For applications seeking automotive-grade passive components, the series’ AEC-Q200E qualification is a relevant selection attribute. The UL 94 V-0-rated plastic case and epoxy sealing may also be pertinent to enclosure and material-selection requirements.

Availability and further information

The source/distributor and datasheet links on this page provide further information on the TDK B3272 DC-link film capacitor series, including variant-specific details and documentation.