Zener TVS diode for 62.2 V rail protection
The 1N6128A is a Zener-type transient voltage suppressor from Microchip Technology, designed to clamp overvoltage events on a 62.2 V nominal rail. Its 500 W peak pulse power rating gives it the energy capacity for industrial control, telecom, and power-supply secondary-side protection where the line sees repetitive surges. With a minimum breakdown voltage of 77.9 V and a maximum clamping voltage of 112.8 V at 4.4 A peak pulse current, this part leaves a comfortable margin above the 62.2 V standoff — the rail never sees the clamp engage during normal operation.
Bidirectional channel and wide temperature envelope
A single bidirectional channel means the 1N6128A clamps both positive and negative transients symmetrically — useful on AC signal lines or DC rails where polarity reversal is possible. The junction is rated for -55°C to 175°C, so it survives under-hood automotive ambient and high-side switching hot spots without derating the pulse power. The through-hole axial package (B, Axial per the supplier device code) suits point-to-point wiring on terminal strips or PCB layouts where a TO-220 or surface-mount part would complicate the thermal path. No power line protection feature is claimed — this is a pure transient clamp, not a filter.
Active production — sourcing via RFQ
Microchip lists the 1N6128A as Active, so no end-of-life notice is pending. The base product number is 1N6128, and the full order code includes the 'A' suffix for the specific breakdown tolerance bin.