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TDK announced its B3272*A/G/T series of DC-link film capacitors, rated for continuous operation at case temperatures up to 135°C. The company says the parts need no derating through 105°C and are intended for automotive and industrial power electronics; pricing and availability were not included in the source report.
TDK has announced the B3272*A/G/T series of DC-link film capacitors, qualified for continuous operation at case temperatures up to 135°C. The company says the parts require no derating up to 105°C and are aimed at electric-vehicle traction inverters, on-board chargers and DC-DC converters, as well as industrial drives and high-end power supplies.
The series spans rated DC voltages from 800 to 1,200 volts and capacitance values from 1.0 to 60 microfarads. TDK lists two-pin and four-pin versions, with lead spacings of 27.5, 37.5 and 52.5 millimeters. Maximum RMS current ranges from 3.5 to 24 amps, with those ratings specified at 85°C and 10 kHz; the applicable value varies by part.
TDK says the capacitors use its EPN dielectric, a blend of polypropylene and cyclic olefin copolymer that the company says has also been used in its ModCap UHP power capacitors. It lists a useful life of 100,000 hours at rated voltage and 85°C, along with self-healing properties and overvoltage capability. The series is AEC-Q200E qualified and RoHS-compatible, according to TDK, and its flame-retardant plastic case and epoxy resin sealing comply with UL 94 V-0.
The company identifies specific layout options within the range. The four-pin G types support low-inductance busbar interfaces and, TDK says, can reduce parasitic loop area in fast-switching inverter stages. The low-profile B32726T is intended for assemblies with restricted height. TDK also provides SPICE model libraries and its web-based Capacitor Life And Rating Application, known as CLARA.
Thermal Headroom in Power Electronics
DC-link capacitors sit between a power source and the switching stage in equipment such as inverters and chargers. They absorb ripple current produced by switching, and that current generates heat in the capacitor. A higher stated operating-temperature limit may give designers more room to manage heat in compact assemblies, where high power density, limited space and elevated ambient temperatures can put stress on passive components.
TDK’s 135°C case-temperature rating is a component specification, not a guarantee that an entire inverter or vehicle system can operate at that temperature. Designers still need to account for ripple current, voltage, cooling, layout and the capacitor’s expected service conditions. The announced range is relevant to engineers weighing those constraints, but the provided information does not establish a specific system-level performance gain or cost benefit.
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How the New Series Is Specified
Film capacitors are used in DC-link positions because they handle the electrical demands of power-conversion systems. As temperature rises, polypropylene film capacitors are commonly derated, meaning their permitted operating conditions are reduced. TDK says the EPN dielectric in this series allows no derating up to 105°C, while the parts are qualified for continuous operation at case temperatures as high as 135°C.
Those figures describe different points in the product’s stated operating envelope: the no-derating temperature and the maximum continuous case-temperature qualification. They should not be read as an assertion that every part can deliver its maximum current at 135°C. TDK’s published maximum RMS current figures, as reported by Charged EVs, are given at 85°C and 10 kHz, and differ by model.
“The series is qualified for continuous operation at case temperatures up to 135°C.”
— TDK, as reported by Charged EVs
high temperature power capacitors for inverters
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Availability and Test Conditions
The source report does not give pricing, order availability or a launch schedule. It also does not provide detailed test methods behind the 135°C qualification or identify which specific models meet each current, capacitance and voltage combination. The listed 100,000-hour life applies at rated voltage and 85°C; it should not be treated as a lifetime figure at the maximum case temperature.
TDK’s claims about thermal headroom and reduced parasitic loop area describe intended design benefits, but the report includes no independent test results or system-level comparisons. Engineers will need the individual part specifications and application conditions to determine performance in a particular design.
automotive DC-link film capacitors
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Check Individual Part Data
Designers considering the capacitors can consult TDK’s part-level specifications, SPICE models and CLARA tool, which the company says are available for the series. Those resources can help assess ratings and estimated life for a specific operating profile. Further details on commercial availability, pricing and model-by-model performance were not provided in the source report.
industrial power electronics film capacitors
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Key Questions
What did TDK announce?
TDK announced the B3272*A/G/T series of DC-link film capacitors, qualified for continuous operation at case temperatures up to 135°C.
What does “no derating up to 105°C” mean?
TDK says the parts do not require derating through 105°C. Derating generally means reducing permitted operating conditions as temperature rises; the specific limits still depend on the individual part and its application.
Which applications are the capacitors intended for?
TDK lists electric-vehicle traction inverters, on-board chargers and automotive DC-DC converters, as well as industrial drives and high-end power supplies.
What are the series’ main electrical ratings?
The announced range covers 800–1,200 V DC and 1.0–60 µF. Maximum RMS current is listed as 3.5–24 A depending on type, measured at 85°C and 10 kHz.
Are pricing and availability known?
The source report does not specify pricing, order availability or a release schedule.
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