1500 W bidirectional TVS for high-voltage rail clamping
The 1.5KE400C-E3/73: The Vishay 1.5KE400C-/73 is a bidirectional TransZorb® transient voltage suppressor (TVS) diode, not a standard Zener regulator — its job is to clamp fast overvoltage transients, not to provide a stable reference. The reverse standoff voltage is 324 V typical, meaning the part does not conduct appreciably below that level. This 250 V window between standoff and clamp defines the protection margin for the downstream circuitry.
Obsolete — sourcing through independent channels
For existing BOM lines or repair stock, the part is available through independent surplus and broker distribution.
Wide temperature range and through-hole mounting
The junction temperature range spans -55°C to 175°C, covering military and industrial thermal environments. The DO-201AA (DO-27) axial-lead package is a through-hole part — it mounts into a 1.0 mm diameter hole on a standard PCB or terminal strip, and the lead spacing is typically 0.3 to 0.4 inches.