Lightning-resistant TVS diodes safeguard avionics

Two TVS diode series from Littelfuse provide DO-160 Waveform 5A Level 5 lightning protection for avionics, military, and other mission-critical systems. The SM15KPA-HR/HRA and SM30KPA-HR/HRA offer peak pulse power ratings of 15 kW and 30 kW (10/1000 µs), respectively, protecting I/O lines, power buses, and sensitive electronics from lightning-induced transients and high-energy surges.

Both families offer fast response times—typically less than 1 ps from 0 V to V_BR minimum—30-kV ESD protection per IEC 61000-4-2 on data lines, and low incremental surge resistance. The devices remain stable across a junction temperature range of –55°C to +150°C. While all diodes undergo high-reliability 100% screening tests, the HR versions additionally pass MIL-STD-750 Group B tests for extra test rigor and extended reliability margins.

The TVS diodes come in compact SPD4-1 surface-mount packages compatible with automated assembly. These packages reduce weight and board space while eliminating the through-hole mounting typically required for high-energy TVS components.

The SM15KPA-HR, SM15KPA-HRA, SM30KPA-HR, and SM30KPA-HRA series are available in tape-and-reel format in quantities of 500. Samples can be requested through authorized Littelfuse distributors worldwide.

Littelfuse

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