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. Peak pulse current is 124A for the 10/1000µs waveform — the actual current the die can sink without failing, used to calculate the transient energy the part absorbs per event.
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.