Transient protection for 145V DC rails
The 1.5KE170AE3/TR13: The breakdown voltage range starts at 162V minimum, meaning the device begins conducting and shunting overvoltage energy before the rail reaches a destructive level.
Package and board integration
Housed in a DO-201AA / DO-27 axial leaded package, the 1.5KE170AE3/TR13 is a through-hole device intended for hand insertion or wave solder. The axial body allows it to be mounted standing upright or laid flat against the board — the lead bend radius should follow the manufacturer's recommendation to avoid cracking the glass passivation. The Tape & Reel packaging supports automated tube-to-reel conversion for pick-and-place if the line is set up for axial components, though most through-hole TVS diodes are hand-loaded.
Sourcing an obsolete protection diode
Microsemi has marked the 1.5KE170AE3/TR13 as Obsolete. No official successor order code is recorded in the lifecycle data. This means the manufacturer no longer produces the device, and the only supply channel is independent distribution — surplus inventory, excess stock from OEM contracts, or broker-sourced lots. Each reel is lot-specific; date code and quantity are confirmed at the time of RFQ. For a BOM that already specifies this exact order code, the replacement path is not a pin-compatible second source — the 1.5KE170 series is a Microsemi-specific variant with the (RoHS-compliant) suffix. A parametric substitute from another brand (e.g., Littelfuse 1.5KE170A or Vishay 1.5KE170A) would match the 145V standoff, 234V clamp, and 1500W rating but may differ in the breakdown tolerance window and the lead finish. A board-level qualification is recommended before committing a substitute to production.