The STMicroelectronics SMCJ18CA-TR is a bidirectional Zener TVS diode from the SMCJ TRANSIL™ series, rated for 1500 W peak pulse power (1.5 kW) over the standard 10/1000 µs waveform. The 18 V reverse standoff voltage sets the working rail it protects — a 12 V or 15 V supply bus, for instance — while the 20 V minimum breakdown and 39.3 V maximum clamping define the transient window.
STMicroelectronics SMCJ18CA-TR TVS Diode
MPNSMCJ18CA-TR
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STMicroelectronics SMCJ, TRANSIL™ series bidirectional TVS diode, 1500W peak pulse power, 18V reverse standoff, 20V breakdown min, 39.3V clamping, 254A peak pulse current, DO-214AB (SMC) surface mount, -55°C to 150°C junction.
$0.7700Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Type | Zener |
| Series | SMCJ, TRANSIL™ |
| Mounting | Surface Mount |
| Voltage - breakdown | 20V |
| Voltage - clamping (Max) @ ipp | 39.3V |
| Voltage - reverse standoff | 18V |
| Current - peak pulse (10/1000μs) | 254A (8/20µs) |
| Power - peak pulse | 1500W (1.5kW) |
| Power line protection | No |
| Operating temperature | -55°C ~ 150°C (TJ) |
| Package | Tape & Reel (TR) Cut Tape (CT) |
| Applications | General Purpose |
| Case | DO-214AB, SMC |
| Bidirectional channels | 1 |
Product details
Frequently asked questions
What is the difference between SMCJ18CA-TR and SMCJ18A?
The SMCJ18CA-TR is the bidirectional version; the SMCJ18A is the unidirectional variant. Both share the same 18 V standoff, 1500 W rating, and DO-214AB package — the choice depends on whether the protected line requires clamping in both polarities (bidirectional) or only one (unidirectional).