What the 1.5KE7.5A is and where it fits
The 1.5KE7.5A is a unidirectional Zener TVS diode from onsemi's Mosorb™ series, designed to clamp transients on a 6.4V nominal rail (reverse standoff) up to 11.3V at the peak pulse current of 132A (10/1000µs waveform). It is a through-hole part in a DO-201AD axial package, rated for a wide operating junction temperature range of -65°C to 175°C.
Obsolete – what that means for your BOM
onsemi has marked the 1.5KE7.5A as Obsolete. For a BOM line that depends on this exact order code, the options are a last-time buy from remaining distributor stock or a pin-compatible replacement from the same 1.5KE series family.
Key ratings and what they mean for fit
The minimum breakdown voltage is 7.13V — this is the voltage at which the device starts to conduct avalanche current. The clamping voltage at the peak pulse current of 132A is 11.3V, which is the maximum voltage the protected circuit will see during a surge event. The 1500W peak pulse power rating defines the energy-handling capability for a 10/1000µs waveform; a higher-energy transient will exceed the device's safe operating area.
