E12. E93-403. M20

The E12. E93-403. M20 is rated for 5000 V/us dv/dt. This rating allows the capacitor to handle voltage transitions up to 5000 volts per microsecond without damage. For a 1200V IGBT switching in 200ns, the dv/dt is approximately 6000 V/us, so this capacitor is well-suited for most IGBT applications. The dv/dt capability is related to the capacitor's internal construction and inductance. Exceeding the dv/dt rating can cause internal heating and reduced lifetime. The peak current capability is Ipeak = C x dv/dt = 0.4uF x 5000 V/us = 2000A, which matches the specified peak current rating.

Verify your application's maximum dv/dt is within the 5000 V/us rating.

For an RC snubber using the E12. E93-403. M20: 1) Determine the characteristic impedance: Z = sqrt(L/C), where L is stray inductance and C is capacitance (0.4uF), 2) For typical stray inductance of 100nH: Z = sqrt(100nH/0.4uF) = 15.8 ohms, 3) Select resistor value close to Z for critical damping, typically 10-22 ohms, 4) Calculate power dissipation: P = 0.5 x C x V x V x f, where V is voltage and f is switching frequency, 5) Select resistor power rating with 2-3x margin. For 1000V and 10kHz: P = 0.5 x 0.4uF x 1000 x 1000 x 10kHz = 2W, use 5-10W resistor. Use non-inductive resistors (carbon composition or film) to avoid adding inductance.

Calculate based on your circuit inductance and switching characteristics, or consult our FAE team.

Yes, the E12. E93-403. M20 is suitable for SiC MOSFET protection. SiC devices switch faster than IGBTs, with dv/dt rates up to 50-100 kV/us, which can cause significant voltage overshoot due to stray inductance. The E12. E93-403. M20 with 5000 V/us rating and <20nH inductance provides effective protection for SiC applications. The low inductance is critical for SiC protection as high ESL reduces snubber effectiveness. For very fast SiC applications, consider using multiple capacitors in parallel to further reduce ESL. The 2000V rating accommodates 1200V SiC devices with margin. The 0.4uF capacitance is appropriate for most SiC modules up to 200A. The capacitor's self-healing properties ensure reliability under the high stress of SiC switching.

The E12. E93-403. M20 is well-suited for SiC MOSFET protection; consider parallel connection for very fast switching applications.

The E12. E93-403. M20 has inductance below 20nH (typical 15nH). Low inductance is critical for snubber capacitors because: 1) Response time - lower inductance allows faster response to voltage transients, 2) Effectiveness - the snubber capacitor must act faster than the voltage rise to be effective, 3) ESL adds to stray inductance - high capacitor ESL reduces snubber performance, 4) Resonance - ESL can form resonant circuits with stray inductance. The 15nH inductance means the capacitor can respond to transients in approximately 1-2ns. For comparison, standard film capacitors may have 50-100nH inductance. The low inductance is achieved through optimized internal construction and short lead lengths. When mounting, keep leads as short as possible to maintain low inductance.

Always select snubber capacitors with low ESL (<30nH) for effective high-speed switching protection.

To verify snubber effectiveness with the E12. E93-403. M20: 1) Oscilloscope measurement - use high-voltage differential probe to measure Vce across the IGBT, 2) Look for voltage overshoot - without snubber, overshoot can reach 1.5-2x DC bus voltage, 3) With proper snubber, overshoot should be <1.3x DC bus voltage, 4) Measure dv/dt - should be limited to device rating, 5) Check for ringing - snubber should dampen oscillations within 1-2 cycles, 6) Thermal check - snubber resistor should not overheat under normal operation. Set oscilloscope to capture turn-off transients with single-shot trigger. Compare waveforms with and without snubber to verify effectiveness. The snubber should reduce overshoot voltage and ringing without excessive losses.

Use oscilloscope measurements to verify snubber effectiveness; adjust R and C values if needed.

The E12. E93-403. M20 is rated for 100,000 hours at 70C hot spot temperature. In snubber applications, lifetime depends on: 1) Voltage stress - snubber capacitors experience pulse voltage, average should be <80% of rated, 2) Current stress - peak current should be within rating, 3) Temperature - hot spot temperature should be <70C for rated lifetime, 4) Switching frequency - higher frequency increases stress. The self-healing properties handle minor dielectric stress over time. Unlike DC-link capacitors, snubber capacitors typically don't show gradual capacitance decrease with aging. Monitor for physical damage (case swelling) or significant capacitance change (>10%). Typical service life exceeds 15 years in normal industrial applications.

Design for moderate temperature and voltage stress to achieve maximum lifetime in snubber applications.