B3271xP Series DC Link Film Capacitors

TDK Corporation B3271xP series DC link film capacitors offer high thermal robustness for demanding automotive and industrial power electronics. With a maximum operating temperature of +125°C and no power derating up to +105°C, the series ensures stable capacitance and reliable energy buffering even in tightly packed inverter environments. This performance is particularly relevant for xEV traction inverters, onboard chargers, and DC/DC converters, where elevated ambient temperatures and continuous ripple loads are common.

The B3271xP series covers capacitance values from 0.47 µF to 110 µF and rated DC voltages from 600 V to 1200 V, enabling flexible design-in for frequency converters, high-end industrial power supplies, and solar inverters. Its polypropylene (MKP) dielectric provides inherently low losses, high ripple current capability, and excellent self-healing behavior, maintaining efficiency and extending system lifetime under harsh electrical stress.

Engineered with a flame-retardant plastic case and epoxy sealing (UL 94 V-0), the components are available with lead spacings of 27.5 mm, 37.5 mm, and 52.5 mm, and in 2-pin or, on request, 4-pin configurations to support mechanical stability and low-inductance layouts. Typical ESR values down to the single-digit milliohm range and high current capability at 10 kHz contribute to robust DC link filtering and reduced thermal rise.

Compliant with AEC-Q200E and UL 810 (construction), the B3271xP series delivers the reliability expected in automotive platforms while supporting global industrial requirements. Its combination of high-temperature endurance, broad electrical performance, and compact dimensions helps engineers optimize converter designs for efficiency, stability, and long-term durability.

For the B3271xP series, TDK provides various SPICE model libraries and the web-based Capacitor Life And Rating Application (CLARA) tool.