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.
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.
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.