B32656S1474K412
TDK EPCOS B32656S low-inductance MKP snubber capacitor, 470 nF at 1600 V DC with about 6 nH ESL for IGBT protection.
The B32656S1474K412 is a TDK EPCOS B32656S series snubber film capacitor rated at 1600 V DC with 470 nF, in the low-inductance format tailored to high-power IGBT modules. The B32656S to B32658S series is a metallized polypropylene snubber range with extremely low equivalent series inductance, as low as about 6 nH, high pulse strength and reliable contacts, designed to protect IGBT modules against the voltage peaks produced when a high current is switched off across a DC link. Because the snubber must respond within nanoseconds, its low ESL is what makes it effective: the part absorbs the energy of the commutation loop quickly and limits the collector-emitter overshoot, keeping the device within its safe operating area. The series is available in many terminal configurations with hole spacings from 19.5 mm to 63 mm, so a capacitor can be matched to the IGBT module, and the voltage range covers 850 V to 2000 V DC. Typical uses include frequency converters, traction converters, welding inverters and any high-power IGBT stage. Every capacitor BeiLuo ships is factory-traceable and includes an import declaration, a certificate of origin and a RoHS compliance file. Our FAE team helps you size the snubber capacitance, choose the terminal configuration and plan the low-inductance layout.
FAE Professional Review
The B32656S1474K412 is a low-ESL snubber tailored to protect high-power IGBT modules, with about 6 nH of ESL and high pulse strength. Its effectiveness depends on mounting it close to the module with a short loop, so the layout is as important as the part. Match the terminal configuration to the module and measure the overshoot reduction on the bench.
| Parameter | Value |
|---|---|
| Capacitance | 470 nF |
| Voltage | 1600 V DC |
| ESL | 6 nH |
| Construction | MKP snubber |
Application Circuits
IGBT overvoltage protection
Reference circuits and application schematics for IGBT overvoltage protection are available from our FAE team.
Frequency converter snubbers
Reference circuits and application schematics for Frequency converter snubbers are available from our FAE team.
Traction and welding inverters
Reference circuits and application schematics for Traction and welding inverters are available from our FAE team.
Need a reference schematic or design review? Our FAE engineers can share verified circuits and layout guidance for this part.
Related Documents
Alternative Part Numbers
| Model | Package | Note | Action |
|---|---|---|---|
| B32654A0224J000 | Lower-voltage leaded MKP snubber for compact stages | View |
Complementary Part Numbers
| Model | Package | Note | Action |
|---|---|---|---|
| B25620B0287K701 | DC-link film capacitor for the same bus | View | |
| B43713A6478M000 | Screw terminal Ø90 x 145.5 mm | Screw-terminal electrolytic for energy storage | View |
Recommended Complementary Products
Frequently Asked Questions
What projects suit the B32656S1474K412?
It suits high-power IGBT stages that need protection against turn-off overvoltage, such as frequency converters, traction and welding inverters. Its 6 nH ESL and 1600 V DC rating make it effective at the fast switching of large modules.
Match the terminal configuration to your module.
How does low ESL help?
The snubber must absorb the commutation-loop energy within a fast switching edge, so its equivalent series inductance sets how quickly it responds. At about 6 nH the part responds sooner and the overshoot is smaller, which is why low ESL is the key parameter in a snubber.
Keep the snubber loop short for the best result.
Is the part genuine and documented?
BeiLuo supplies factory-traceable B32656S1474K412 capacitors with an import declaration, certificate of origin and RoHS file on every order. Stock is normally available and the datasheet downloads from this page.
Order a sample to validate the part before volume production.