A 1500W bidirectional transient suppressor — what it protects and where it goes
The STMicroelectronics 1.5KE82CA is a bidirectional Zener TVS diode from the 1.5KE TRANSIL™ family, rated for 1500W peak pulse power (10/1000µs waveform). It clamps transients at 146V maximum, with a reverse standoff voltage of 70.1V and a minimum breakdown of 77.9V. This is a through-hole part in a DO-201AA / DO-27 axial-lead package, meant for general-purpose overvoltage protection on AC or DC power rails, signal lines, and industrial control inputs where bidirectional clamping is needed.
For new designs or replacement needs, the 1.5KE series includes other voltage variants that may fit, but no direct pin-compatible replacement is cited in the record. Sourcing is through independent distribution; we can quote against an RFQ for available inventory, but expect limited stock and no factory lead time.
Key ratings at a glance
Peak pulse power: 1500W (1.5kW) ensures it can handle substantial surge energy from lightning or inductive load switching. Reverse standoff voltage: 70.1V — the maximum DC or AC peak voltage the protected line can carry without the diode conducting. Breakdown voltage: 77.9V minimum — where clamping starts. Clamping voltage: 146V maximum at rated peak pulse current — the voltage the protected circuitry must survive. Capacitance: 675pF at 1MHz — high enough to affect fast digital signals; check signal integrity on high-speed lines.
Through-hole axial package — hand-solder friendly
The DO-201AA / DO-27 axial-lead package is through-hole, easy to hand-solder and replace in rework. No special reflow profile needed. The leads are tin-plated copper; standard 1.0mm diameter holes on a 0.4 inch pitch work for most protoboards. Keep the lead length short to minimize inductance and maintain clamping speed.