TVS diode rating for 33V rail protection
Clamp voltage hits 59V at the peak pulse current of 25.2A (10/1000µs waveform), so the downstream silicon sees a hard ceiling during a surge event. The DO-214AB (SMC) package keeps the thermal path to the board copper — the junction-to-ambient resistance drops as the pad area increases.
Microchip lists this part as Active. The base product number SMCJ33 covers a family of unidirectional and bidirectional variants, but the CE3 suffix identifies this specific bidirectional Zener die in a Tape & Reel (TR) package. Operating temperature range -65°C to 150°C (TJ) covers military and industrial extremes — the junction rating is the same as the case rating, no derating needed for ambient up to 125°C as long as the board copper is adequate.
Sourcing and availability reality
No stock-holding claim here — we source per RFQ across multiple distributor channels. The DO-214AB footprint is shared across the SMCJ series, so board layout is standard. Bidirectional channel means the device clamps both polarities — no orientation sensitivity during assembly.