HVC_Knowledge_Base

Can HVC replace Semikron/Semtech SKa/SK series high voltage diodes?

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Can HVC replace Semikron/Semtech SKa/SK series high voltage diodes?

Yes — HVC Capacitor's HVD-HighCurrent series provides direct functional replacements for Semikron and Semtech SKa/SK family high-voltage silicon rectifier diodes, addressing the chronic supply constraints and allocation issues affecting these European semiconductor brands.

Parameter	Semikron SKa / Semtech SK Series	HVC HVD-HighCurrent Series	Advantage
Voltage Range	2kV – 20kV (standard)	5kV – 50kV	✅ Extended to 50kV
Forward Current (IF)	0.5A – 20A	0.5A – 10A standard, up to 25A custom	Comparable + custom option
Reverse Recovery Time (trr)	75ns – 500ns (model-dependent)	40ns – 200ns	✅ Faster recovery available
Reverse Recovery Charge (Qrr)	Per datasheet	30% lower typical	✅ Reduced switching loss
Junction Temperature (Tj)	-40°C ~ +175°C	-55°C ~ +150°C	Broader low-temp range
Lead Time	16 – 28 weeks (allocation common)	4 – 6 weeks	✅ 5x faster
Cost Index	Baseline (1.0)	40 – 55% of baseline	✅ Significant savings

Welding machine rectifiers	SKa series, 10-20A	✅ Excellent	Same thermal performance
Application	Semikron Typical Use	HVD-HC Alternative Suitability	Notes
Industrial motor drives	SK series, 5-15A	✅ Excellent	Lower Qrr reduces heatsink size
X-ray generator multipliers	Special order	✅ Excellent	Medical-grade qualification available
RF plasma generators	Fast recovery variants	✅ Good	trr 40ns variant matches best Semikron specs
Railway traction auxiliaries	High-reliability grade	⚠️ Evaluate	May require additional vibration testing