What the 1.5 kW rating means for your rail protection
The 1.5KE100CAHA0G: That 1.5 kW rating is the device's ability to absorb a transient without failing — it is not a continuous power rating. For a 24 V or 48 V automotive bus, the 85.5 V reverse standoff means the diode does not conduct during normal operation; only when the transient exceeds the 95 V minimum breakdown does it clamp, limiting the spike to 137 V maximum while shunting up to 11.4 A of peak pulse current. Because it is bidirectional, a single device protects both positive and negative transients — useful on AC-coupled data lines or bipolar power rails where polarity is not fixed. The 10/1000 µs waveform is the industry-standard pulse for TVS characterization; if your application's transient is shorter (8/20 µs, for example), the peak power capability is higher, but the 1.5 kW figure at 10/1000 µs is the conservative anchor for derating.
Automotive qualification and temperature envelope
AEC-Q101 qualification places this part in the automotive-grade bin — it has passed the stress tests (temperature cycling, high-temperature reverse bias, ESD) required for under-hood and passenger-compartment electronics. The DO-201AA axial package is a through-hole format with a 0.052-inch lead diameter — it inserts into a 0.040-inch plated through-hole and is wave-soldered. The axial leads carry the full 11.4 A pulse current without fusing, but the PCB trace width between the TVS and the protected rail must be sized for that peak current (at least 50 mils of 1 oz copper per the IPC-2221 derating). The supplier device package is DO-201, which is the same body as the DO-27; both are interchangeable for footprint purposes.
Active lifecycle and sourcing posture
The base product number is 1.5KE100, and the suffix CAHA0G encodes the bidirectional polarity (CA), the automotive grade (HA), and the packaging (0G for Tape & Box). If the design requires an unidirectional version, the 1.5KE100A variant is the same family with a single-direction die; if a different package is needed, the SMCJ series offers a surface-mount alternative, though the pinout and thermal path differ.