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STMicroelectronics SM6T33CA — Circuit Protection

STMicroelectronics SM6T33CA TVS Diode, 600W Bidirectional

MPNSM6T33CA
Active

STMicroelectronics SM6T33CA, TRANSIL series, Bidirectional TVS Diode, 600W Peak Pulse, 28.2V Standoff, 31.4V Breakdown Min, 59V Clamping, DO-214AA SMB Package, -55°C to 150°C.

$0.5300Ref. price · indicative, final on quote
STMicroelectronics SM6T33CA datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SM6T33CA specifications
ParameterValue
TypeZener
SeriesSM6T, TRANSIL™
MountingSurface Mount
Voltage - breakdown31.4V
Voltage - clamping (Max) @ ipp59V
Voltage - reverse standoff28.2V
Current - peak pulse (10/1000μs)68A (8/20µs)
Power - peak pulse600W
Power line protectionNo
Operating temperature-55°C~150°C(TJ)
PackageTape & Reel (TR); Cut Tape (CT)
ApplicationsGeneral Purpose
CaseDO-214AA, SMB
Bidirectional channels1

Product details

Transient protection in a DO-214AA footprint

It is rated for a peak pulse power of 600W and a peak pulse current of 68A under the 8/20 µs waveform, with a reverse standoff voltage of 28.2V and a minimum breakdown voltage of 31.4V. The single bidirectional channel protects against surges of either polarity, making it a straightforward choice for unipolar or bipolar rail clamping in a single SMB (DO-214AA) package.

Above that, the device begins to break down at a guaranteed minimum of 31.4V. For a 24V nominal rail (common in industrial control and telecom), the 28.2V standoff provides enough margin to avoid nuisance triggering from normal ripple, while the 59V clamp keeps the protected node within the safe operating area of most downstream 60V-rated components.

The base product number is SM6T33, so the 'CA' suffix confirms the bidirectional polarity variant.

Frequently asked questions

Is SM6T33CA bidirectional or unidirectional?

SM6T33CA is a bidirectional TVS diode, with a single bidirectional channel. It clamps transients of either polarity symmetrically.

What is the peak pulse current of SM6T33CA?

The peak pulse current is 68A under the 8/20 µs waveform, corresponding to the 600W peak pulse power rating.

What is the difference between SM6T33CA and SM6T33A?

The SM6T33CA is the bidirectional variant; the SM6T33A is the unidirectional version. Both share the same 28.2V standoff, 31.4V breakdown, and 600W power rating, but the unidirectional A version conducts only in one direction and has a different clamping characteristic for forward-biased surges.