Bidirectional Zener TVS – 47.1 V Standoff, 500 W Peak Pulse
The 1N6125AUS is a bidirectional Zener transient-voltage suppressor from Microchip Technology, designed to clamp transients on a 47.1 V reverse standoff rail to a maximum clamping voltage of 85.3 V at the peak pulse current of 5.9 A. The 500 W peak pulse power rating (10/1000 µs waveform) means this part can absorb repetitive surges on a 48 V nominal bus without derating into the thermal limit — a common requirement in telecom and industrial power supplies. Packaged in a SQ-MELF, B case, the 1N6125AUS is a surface-mount device suited for automated assembly on boards where through-hole TVS parts would add height or assembly steps. The SQ-MELF body offers a low-inductance path for fast transients, which matters when the clamping voltage must stay tight against the 85.3 V ceiling.
For a BOM engineer sizing protection for an outdoor telecom cabinet or an avionics power bus, the 175°C upper limit means the part does not need secondary derating when ambient temperature pushes past 85°C — the junction can run hot without shifting the 58.9 V minimum breakdown voltage.
Active Production – Sourcing Through Authorized Distribution
Microchip lists the 1N6125AUS as Active, so there is no last-time-buy clock or EOL risk on the horizon. The base product number is 1N6125, and the 'AUS' suffix denotes the SQ-MELF surface-mount package variant.