Transient suppressor for high-surge environments
It clamps transients at 11.2V maximum while standing off 5.7V continuously — a fit for 5V or 12V rails that need a hard clamp under surge events. The SQ-MELF C package is a surface-mount ceramic body with solderable end caps, suited for automated pick-and-place and reflow assembly. The -55°C to 175°C junction temperature range supports deployment in avionics, industrial controls, and outdoor telecom where ambient extremes are routine.
Clamping voltage and pulse current
Breakdown occurs at a minimum of 7.13V, ensuring the device triggers before the protected circuitry sees damaging overvoltage. At the rated 133.9A peak pulse current, the clamp voltage holds at 11.2V max — a tight ratio that limits stress on downstream semiconductors. Bidirectional operation (single channel) means the same device protects both positive and negative transients, simplifying BOM count on AC-coupled or bipolar signal lines.
Active production status
Microchip continues to manufacture this part, so the supply channel is open for both prototype and production quantities. The base product number is 1N6139; the AUS suffix denotes the surface-mount SQ-MELF variant. No direct replacement or successor has been announced — this is the current ordering code for the bidirectional, 1500W, SQ-MELF configuration.