Surge protection for 24V rails — 1500W in a DO-214AB
The SMCJ26E3/TR13 is a unidirectional Zener TVS diode from Microchip Technology, rated for 1500W peak pulse power (10/1000µs waveform) with a 26V reverse standoff voltage and a 46.6V clamping ceiling at 32.2A — a common choice for protecting 24V DC power buses and signal lines in industrial and telecom gear.
Clamping voltage and pulse current — the protection window
The 26V reverse standoff (Vrwm) is the normal operating voltage — the part stays transparent below that. When a surge pushes the line above the 28.9V minimum breakdown, the Zener clamps at 46.6V maximum while shunting 32.2A peak pulse current. No power line protection feature (: No) — this is a unidirectional device for DC rails, not AC mains. The single-channel unidirectional design (: 1) suits positive-ground or single-rail suppression.
Microchip lists the SMCJ26E3/TR13 as Active. The base product number SMCJ26 covers the whole family; the suffix indicates RoHS-compliant and halogen-free construction per Microchip's internal coding.