Feb. 10, 2026 — TDK Corporation has announced the B3271xP series of DC link film capacitors, offering 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.
Main applications:
- Frequency converters
- Industrial and high-end power supplies
- Solar inverters
Main features and benefits:
- High operating temperature of +125 °C
- Power derating starting at +105 °C
- High CV product, compact
- Good self-healing properties
- 4-pin versions available on request
- Over-voltage capability
- Low losses with high current capability
- High reliability
- Long useful life
- RoHS-compatible
- UL 810 construction
- AEC-Q200E compliant
About TDK Corporation
TDK Corporation is a global technology company and innovation leader in the electronics industry, based in Tokyo, Japan. With the tagline “In Everything, Better” TDK aims to realize a better future across all aspects of life, industry and society. For over 90 years, TDK has shaped the world from within; from the pioneering ferrite cores to cassette tapes that defined an era, to powering the digital age with advanced components, sensors and batteries, leading the way towards a more sustainable future. United by TDK Venture Spirit, a start-up mentality built on visions, courage and mutual trust, TDK’s passionate team members around the globe pursue better—for ourselves, customers, partners and the world. Today, the state-of-the-art technologies of TDK are in everything, from industrial applications, energy systems, electric vehicles, to smartphones and gaming, at the core of modern life. TDK’s comprehensive, innovative-driven portfolio includes cutting-edge passive components, sensors and sensor systems, power supplies, lithium-ion and solid-state batteries, magnetic heads, AI and enterprise software solutions and more — featuring numerous market-leading products. These are marketed under the product brands TDK, EPCOS, InvenSense, Micronas, Tronics, TDK-Lambda, TDK SensEI and ATL.