1500W bidirectional TVS in a DO-201 axial package
It delivers 1500W peak pulse power (1.5kW) per the 10/1000µs waveform, with a reverse standoff voltage of 102V and a maximum clamping voltage of 212V at the rated peak pulse current of 47A (also specified for the 8/20µs waveform).
The 1.5KE120CA is marked obsolete by STMicroelectronics.
Key ratings for the protection design
The 212V clamping voltage is the maximum voltage the load sees during the surge; ensure downstream components have adequate margin above this level. The 500pF capacitance at 1MHz is moderate — acceptable for power lines and low-speed signals, but may load high-frequency data lines.