Skip to main content
Log in
STMicroelectronics SM6T22CA — Circuit Protection

STMicroelectronics SM6T22CA TVS Diode, 600 W, Bidirectional

MPNSM6T22CA
Active

STMicroelectronics SM6T, TRANSIL™ series, Type Zener, Bidirectional TVS Diode, 600W peak pulse power, 18.8V reverse standoff, 20.9V breakdown, 30.6V clamp, DO-214AA (SMB), Surface Mount, -55°C to 150°C.

$0.5700Ref. price · indicative, final on quote
STMicroelectronics SM6T22CA datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

SM6T22CA specifications
ParameterValue
TypeZener
SeriesSM6T, TRANSIL™
MountingSurface Mount
Voltage - breakdown20.9V
Voltage - clamping (Max) @ ipp30.6V
Voltage - reverse standoff18.8V
Current - peak pulse (10/1000μs)102A (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

600 W bidirectional transient suppressor for 18.8 V rails

It offers a peak pulse power rating of 600 W for a 10/1000 µs waveform, with a reverse standoff voltage of 18.8 V and a maximum clamping voltage of 30.6 V at the rated peak pulse current.

The 18.8 V reverse standoff voltage means this diode will not conduct on a nominal 18 V rail, but it begins to avalanche at a minimum of 20.9 V. The clamping voltage caps at 30.6 V when the peak pulse current reaches 102 A (8/20 µs waveform). For a design engineer, the margin between the rail voltage and the breakdown threshold determines how much transient overvoltage the system can ride through before the diode starts shunting current; the clamping voltage then tells the downstream components the maximum voltage they will see during a surge event.

There is no last-time-buy risk or obsolescence pressure on this order code today.

Frequently asked questions

Is SM6T22CA a bidirectional TVS diode?

Yes, the SM6T22CA has one bidirectional channel, meaning it clamps both positive and negative transients on a single line, suitable for AC signal or data-pair protection.

What is the peak pulse power rating of SM6T22CA?

The peak pulse power rating is 600 W for a 10/1000 µs waveform, which defines the surge energy the diode can absorb in a single pulse event.

What package does SM6T22CA come in?

The SM6T22CA is supplied in a DO-214AA (SMB) surface-mount package, a common footprint for medium-power TVS diodes that balances board area with thermal dissipation for the 600 W pulse rating.

What is the difference between SM6T22CA and SM6T22A?

The SM6T22CA is the bidirectional version; the SM6T22A is the unidirectional variant. Both share the same 600 W peak pulse power, 18.8 V standoff, and DO-214AA package, but the unidirectional version clamps only one polarity and has a different breakdown voltage characteristic. For a line that sees both positive and negative transients, the CA suffix is the correct choice.