500 W Zener TVS in a surface-mount MELF
The 1N6137AUS: The 152 V reverse standoff voltage means it can sit across a 152 V DC bus without conducting leakage — the clamping threshold is 273 V at 1.8 A peak pulse current. Packaged in a SQ-MELF B case (surface-mount), it suits board-level transient protection where a through-hole part won't fit the assembly process.
Junction temperature and operating envelope
Rated for junction temperatures from -55°C to 175°C, the 1N6137AUS handles the thermal extremes of avionics, industrial drives, and outdoor telecom equipment. The 190 V minimum breakdown voltage gives a guard band below the 273 V clamp — the designer sizes the TVS so the protected circuit's absolute-max rating stays above the clamp level.
The SQ-MELF B package is a standard footprint, widely available through distribution.