Lifecycle status and sourcing reality for the 1.5KE33A-B
The 1.5KE33A-B is classified as Obsolete by Diodes Incorporated, meaning the manufacturer has ceased production and no further factory orders are accepted.
Key electrical ratings and what they mean for circuit protection
The 33 A peak pulse current (Ipp) at that waveform is the corresponding current the device clamps. The reverse standoff voltage is 28.2 V (typ), meaning the diode does not conduct appreciably below this level. This is a unidirectional Zener-type TVS (single channel), so it clamps only one polarity. It is explicitly noted as not intended for power line protection — its application is general-purpose transient suppression on signal or low-voltage DC buses.
Package, mounting, and temperature grade
Supplied in the DO-201AA (DO-27) axial-lead package, through-hole mount, with the supplier device package designated as DO-201. The bulk packaging means units are shipped in tubes or loose, not on tape and reel — relevant for hand-assembly or low-volume production. The wide range suits applications in avionics, downhole instrumentation, or outdoor telecom where ambient conditions vary widely.