500W peak pulse in a surface-mount MELF
That 500W rating means it can absorb a 6.5A peak pulse before the voltage exceeds 77V clamping — enough margin for industrial 24V or 48V rails that see inductive kickback or lightning-coupled surges. A single bidirectional channel replaces two unidirectional TVS diodes in back-to-back, saving board area and reducing BOM count on signal lines that swing both polarities — RS-485, CAN, or audio lines.
53.2V breakdown — selection anchor for 42.6V standoff rail
Breakdown voltage is 53.2V minimum, with a reverse standoff of 42.6V. That standoff sits comfortably above a nominal 36V or 48V bus, so the TVS stays off during normal operation. Clamping max is 77V at the rated 6.5A peak pulse current — the clamp voltage is the ceiling the protected IC sees, so confirm the downstream device can survive 77V for the pulse duration. Power line protection is not supported — this part is designed for signal-line or low-power rail protection, not AC mains.
Active lifecycle — no LTB clock ticking
Microchip lists the 1N6124US/TR as Active. The SQ-MELF package is the surface-mount variant of the through-hole 1N6124; the die is identical, so electrical specs match. The -55°C to 175°C junction temperature range covers underhood automotive, industrial oven, and downhole environments where 150°C-rated devices would derate.