Alternatives to STMicroelectronics SM6T33A
STMicroelectronics SM6T33A and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 SM6T33ASTMicroelectronics |  P6SMB33ALittelfuse Inc. | SMBJ28A-TRSTMicroelectronics | +3more | |
|---|---|---|---|---|
| FFF Compatibility | Both devices use the DO-214AA (SMB) package and share the identical pinout (Pin 1 Cathode, Pin 2 Anode) indicated by a polarity band.Both parts share standard SMB mechanical package dimensions and mounting styles.Meets or exceeds all critical electrical characteristics including 600 W peak pulse power, 28.2 V reverse standoff voltage, and 45.7 V clamping voltage. | Both utilize the standard DO-214AA footprint with identical pinout and layout compatibility.Physical package dimensions are identical as both parts are standard SMB-style components.While functionally equivalent with 600 W peak pulse power, the reverse standoff voltage is slightly lower at 28.0 V (vs 28.2 V) and minimum breakdown voltage is 31.1 V (vs 31.4 V). | ||
 AI Summary | SM6T33A by STMicroelectronics: 45.7V Clamp 13.1A Ipp Tvs Diode Surface Mount SMB. | The P6SMB33A from Littelfuse serves as an exceptional drop-in equivalent for the SM6T33A. It matches the exact reverse standoff voltage of 28.2 V and maximum clamping voltage of 45.7 V, while offering a slightly superior peak pulse current capability of 13.3 A. Both components share the identical JEDEC DO-214AA (SMB) footprint.
| The SMBJ28A-TR is ST's own alternative series variant, sharing the same manufacturer pedigree. It provides a standard 28.0 V working standoff voltage and a slightly higher peak pulse current capability of 13.8 A within the identical SMB physical footprint. The minor difference in working voltage (28.0 V vs 28.2 V) is typically negligible in standard applications.
| |
| Lifecycle Status | Active | Active | Active | |
| Market Availability | In stock | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| Description | 45.7V Clamp 13.1A Ipp Tvs Diode Surface Mount SMB | 45.7V Clamp 13.3A Ipp Tvs Diode Surface Mount DO-214AA (SMBJ) | 45.4V Clamp 13.8A Ipp Tvs Diode Surface Mount SMB | |
| Manufacturer | STMicroelectronics | Littelfuse Inc. | STMicroelectronics | |
| Type | Transient Voltage Suppressors (TVS) | Transient Voltage Suppressors (TVS) | Transient Voltage Suppressors (TVS) | |
| Datasheet | Open | Open | Open | |
| Lead Time | 16 weeks | 30 weeks | 13 weeks | |
| Country of Origin | CN, MY, SG, FR | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8541.10.0080 | - | - | |
| Moisture Sensitivity Level | 1 (Unlimited) | - | - | |
| Type | Zener | - | - | |
| Applications | General Purpose | - | - | |
| Mounting Type | Surface Mount | - | - | |
| Package / Case | DO-214AA, SMB | - | - | |
| Power - Peak Pulse | 600W | - | - | |
| Operating Temperature | -55°C ~ 150°C (TJ) | - | - | |
| Power Line Protection | No | - | - | |
| Supplier Device Package | SMB | - | - |
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Frequently asked questions
Yes. The STMicroelectronics SM6T33A is active and in production. The parts listed here are qualified equivalents if you need a second source or better availability.
The closest qualified second sources for the STMicroelectronics SM6T33A are the P6SMB33A (Littelfuse Inc.) and the SMBJ28A-TR (STMicroelectronics), out of 5 matched alternatives in total. Each is compared against the original on fit, form and function in the table above.
Not always. The alternatives to the SM6T33A are matched on function but can differ in package, pinout or a key parameter, so review the fit/form/function notes in the table and the datasheet before designing one in.
The SM6T33A (STMicroelectronics) is a part in the Transient Voltage Suppressors (TVS) category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
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