What this 1500W bidirectional Zener TVS covers
The 1.5KE9.1CA_R2_00001: It clamps transients at 13.4 V maximum and has a reverse standoff voltage of 7.78 V typical, with a minimum breakdown of 8.65 V. The single bidirectional channel handles surge currents up to 112 A peak pulse (Ipp at 10/1000 µs), making it suitable for general-purpose overvoltage protection on signal or power rails where the operating voltage stays below 7.78 V.
Package, temperature range, and board-fit
Housed in a DO-201AE axial-lead through-hole package (supplier device package DO-201AE), it mounts into a standard 0.100-inch pitch hole pattern. No power line protection feature is built in — this is a discrete TVS, not a filtered protector.
Sourcing an obsolete part — what to expect
Panjit lists the 1.5KE9.1CA_R2_00001 as obsolete. A board-spin to a different package or a different standoff voltage would require requalification.