1500W bidirectional transient suppressor — end-of-life sourcing
The 1.5KE15C-E3/73: It clamps transients at 22V maximum with a peak pulse current of 68.2A, protecting 12.1V nominal rails from surges in general-purpose DC circuits.
Clamping and breakdown — what the ratings mean for the BOM line
The 12.1V reverse standoff voltage (working voltage) means this diode sits across a 12V rail without conducting in normal operation. Breakdown starts at 13.5V minimum, so the rail has about 1.4V of headroom before the diode begins to avalanche. At 22V clamping maximum, the TVS limits the transient to a voltage that downstream components rated for 25V or higher can survive. The 68.2A peak pulse current at the 10/1000µs waveform defines the surge energy the part absorbs — a 1500W peak pulse rating that covers most industrial and telecom surge profiles.
DO-201AA axial package — board-fit note
The leads are tin-plated copper; the body is molded epoxy. Through-hole mounting suits point-to-point wiring, terminal blocks, or PCB layouts where surface-mount reflow is not available. The Tape & Box (TB) packaging option (/73 suffix) ships the diodes in ammo-pack format for automated insertion — common for high-volume through-hole assembly lines.