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STMicroelectronics SMCJ30CA-TR — Circuit Protection

STMicroelectronics SMCJ30CA-TR TVS Diode, 1500W

MPNSMCJ30CA-TR
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STMicroelectronics SMCJ30CA-TR, TRANSIL™ series, bidirectional TVS diode, 1500W peak pulse power, 30V reverse standoff, 64.3V clamping, DO-214AB SMC package, surface mount.

$0.7200Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SMCJ30CA-TR specifications
ParameterValue
TypeZener
SeriesSMCJ, TRANSIL™
MountingSurface Mount
Voltage - breakdown33.3V
Voltage - clamping (Max) @ ipp64.3V
Voltage - reverse standoff30V
Current - peak pulse (10/1000μs)156A (8/20µs)
Power - peak pulse1500W (1.5kW)
Power line protectionNo
Operating temperature-55°C~150°C(TJ)
PackageTape & Reel (TR); Cut Tape (CT)
ApplicationsGeneral Purpose
CaseDO-214AB, SMC
Bidirectional channels1

Product details

1500W bidirectional TVS for 30V rails

Its single bidirectional channel protects both polarities with one device — useful for AC-coupled interfaces or symmetric supply rails where space is tight. The 1500W peak pulse power rating (10/1000µs waveform) defines the surge energy it can absorb; the 64.3V maximum clamp voltage at 156A peak pulse current (8/20µs waveform) tells you the let-through voltage the downstream circuitry must survive. General-purpose application coverage means it fits into industrial control, telecom, or power-supply secondary-side protection without qualification restrictions.

Voltage thresholds and clamping behaviour

Breakdown starts at 33.3V minimum, so a 30V rail with ±5% tolerance stays below the trigger threshold. At full rated surge current the clamp voltage reaches 64.3V — that is the voltage the protected circuit must tolerate during the transient event. If the downstream components have a 60V absolute maximum, this part leaves only 4.3V margin at the clamp peak; a higher-voltage TVS or series resistance may be needed.

Housed in the DO-214AB (SMC) package, a standard surface-mount footprint for medium-power TVS diodes. The SMC body handles the 1500W pulse without requiring a heatsink in most PCB layouts — the copper pad and trace area typically provide enough thermal mass for the short-duration transient.

There is no official successor — the part is the current offering. For BOM planning, this avoids the last-time-buy scramble that obsolete TVS parts trigger.

Frequently asked questions

What is the peak pulse power of SMCJ30CA-TR?

The SMCJ30CA-TR is rated for 1500W peak pulse power (1.5kW) under the standard 10/1000µs waveform. This is the maximum surge energy it can dissipate in a single pulse before the junction temperature exceeds the safe limit.

Is SMCJ30CA-TR bidirectional?

Yes, it is a single bidirectional channel, meaning one device clamps both positive and negative transients. This is useful for AC signal lines, RS-485 pairs, or any rail where the surge polarity is unknown.