Bidirectional TVS for 300 V rail protection
The 1.5KE350CAE3/TR13: The 300 V standoff means this part protects 300 VDC or 240 VAC nominal rails from transients — common in industrial power supplies, motor drive DC buses, and telecom rectifier outputs where the operating voltage sits below the 332 V minimum breakdown. The bidirectional structure (single device, one channel) clamps both polarities, so a single part covers the rail-to-ground and reverse-polarity fault paths without a series diode.
1500 W pulse rating and clamping behaviour
At 4 A peak pulse current (10/1000 µs), the clamping voltage holds at 482 V maximum — this is the voltage the protected circuit must survive across the TVS during the transient event. The 332 V minimum breakdown voltage provides a 32 V guard band above the 300 V standoff, ensuring the device does not conduct at nominal rail voltage but triggers before the transient exceeds the downstream component's absolute maximum rating. Rated for continuous operation from -65°C to 150°C junction temperature, the part handles the self-heating from repetitive pulses in high-ambient environments like outdoor telecom cabinets or industrial enclosures without derating below the 1500 W peak.
DO-201 axial package for through-hole assembly
Housed in a DO-201AA (DO-27) axial-lead package, the 1.5KE350CAE3/TR13 mounts through-hole — the body is cylindrical with wire leads for hand or wave solder, common in high-reliability power supplies where a surface-mount TVS might not survive the reflow profile or board flex.
Obsolete — sourcing through independent channels
No pin-compatible direct replacement is documented by Microsemi — a functional equivalent would need to match the 1500 W peak pulse, 300 V standoff, bidirectional polarity, and DO-201 axial footprint.