Zener TVS for high-reliability rails
1N6140AUS is a bidirectional Zener transient-voltage suppressor rated for 1500W peak pulse power at 10/1000µs waveform — the headline rating a protection engineer checks first when clamping a 6.2V rail against lightning or inductive-load transients. The junction temperature range spans -55°C to 175°C, which puts this part into military/aerospace and downhole equipment where the ambient can exceed 125°C and the self-heating from repetitive pulses must stay within the die's thermal budget.
Clamping voltage and pulse current
Breakdown voltage minimum is 7.79V; the clamping voltage at peak pulse current is 12.1V max — this 4.3V window between standoff and clamp tells the designer how much overvoltage the downstream circuitry must survive before the Zener conducts fully.
Surface-mount MELF for harsh environments
Packaged in SQ-MELF, C — a cylindrical surface-mount body with metallized end caps. The MELF footprint is less common than a SOD or SMB, so confirm the solder pad geometry matches the IPC-7351 standard for this package before committing the PCB layout. The base product number 1N6140 covers a family of voltage variants; the AUS suffix specifies the bidirectional polarity and the SQ-MELF package.