500W bidirectional Zener TVS in SQ-MELF
The 1N6127AUS is a single bidirectional Zener TVS diode from Microchip, rated for 500W peak pulse power per the 10/1000µs waveform. The 56V reverse standoff voltage and 103.1V clamping level suit 48V nominal rail protection in industrial and telecom equipment. The SQ-MELF (B) package is a hermetic surface-mount option — the ceramic-to-metal seal gives it an edge over plastic packages in high-reliability or humid environments.
Bidirectional channel and clamping margin
A single bidirectional channel means the device clamps both polarities symmetrically — no orientation concern during assembly, which simplifies pick-and-place and reduces polarity-related rework. The minimum breakdown voltage is 71.3V, giving a ~15V margin above the 56V standoff before the diode starts conducting leakage. At the peak pulse current of 4.8A the clamp holds at 103.1V max, so the downstream circuitry sees a hard ceiling.
Active production with hermetic package
Microchip lists the 1N6127AUS as Active. The SQ-MELF package is a hermetic ceramic body — no moisture sensitivity level concern, no bake-out required before reflow. The -55°C to 175°C junction temperature range covers military and downhole thermal profiles. For BOM planning, the base product number 1N6127 covers the non-surface-mount variants; the AUS suffix identifies this specific surface-mount hermetic version.