Obsolete — sourcing reality for the 1.5KE47CA
The 1.5KE47CA is officially designated Obsolete by Littelfuse. No successor part number is recorded on the manufacturer's lifecycle notice. Date-code provenance and lot traceability are confirmed at quote time.
Clamping voltage and the protection window
The 64.8 V clamp means downstream components rated for 80 V or higher see a safe voltage during a surge event — the TVS absorbs the energy, not the load.
Bidirectional — one device for both polarities
A single bidirectional channel handles positive and negative transients symmetrically, so a 40.2 V signal pair or power rail needs only one device per line — no series orientation to get wrong. The peak pulse current rating of 23.5 A (10/1000 µs) defines the surge the device can survive; for a shorter transient the energy capability scales inversely with pulse duration per the 1.5KE family's power-derating curve.
Through-hole axial — board-fit and temperature range
Housed in a DO-201AA (DO-27) axial leaded package, the 1.5KE47CA mounts through-hole — the large body and lead cross-section carry the 1500 W pulse without the thermal bottleneck of a smaller SMD package.