Transient protection for 24V rails
The 1.5KE27CA-E3/51: The Vishay 1.5KE27CA-/51 is a bidirectional TransZorb® TVS diode designed to clamp transients on nominal 24V DC buses.
Clamping and breakdown margins
This 11.8V window between the standoff and clamp means a 24V rail sees less than a 60% overvoltage during a surge event — within the safe operating area of most downstream DC-DC converters and linear regulators rated for 40V absolute maximum. The single bidirectional channel clamps both polarities symmetrically, so a single device protects against positive and negative transients without needing back-to-back series diodes.
Temperature range and package
The DO-201AA (DO-27) axial-lead package is through-hole mounted, suited for point-of-entry protection on power input lines where board space is not the constraint.
Last-buy lifecycle — what it means for procurement
Vishay has classified the 1.5KE27CA-/51 as Last Buy. This means the manufacturer is winding down production — the part is not yet obsolete, but the final order window is open. Buyers should secure lifetime-buy quantities or identify a replacement before the EOL date closes.