Obsolete 1500W Zener TVS — last-time-buy sourcing
The 1.5KE7.5-B: No official successor order code is recorded from Littelfuse. A functional replacement would require evaluating the 1.5KE series for a pin-compatible TVS with the same DO-201 package and a 6.4V standoff voltage.
Clamping performance and pulse handling
The 134.5A peak pulse current at the 11.87V clamping voltage means the diode can absorb substantial transient energy without exceeding junction temperature limits. The 6.4V reverse standoff voltage defines the continuous DC rail the TVS protects — a 5V or 3.3V rail would see the diode conducting in standby. The 6.75V minimum breakdown voltage ensures the TVS does not clip the normal operating voltage. Unidirectional (single-channel Zener) — the cathode band on the DO-201 body marks the anode for PCB orientation.
DO-201 axial package — board integration
Through-hole DO-201AA (DO-27) axial package — the 0.042-inch lead diameter fits standard 0.040-inch plated-through holes. The bulk packaging means the parts ship loose in a tube or bag; no tape-and-reel for automated insertion. The axial leads require manual or wave-solder assembly. The body length is approximately 7.6 mm; lead spacing on the PCB should follow the manufacturer's recommended footprint for DO-201 to avoid mechanical stress on the glass passivation.