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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.

Equivalent and substitute parts for STMicroelectronics SM6T33A

SM6T33A compared against its qualified second sources
SM6T33ASTMicroelectronicsP6SMB33ALittelfuse Inc.SMBJ28A-TRSTMicroelectronics+3more
FFF CompatibilityBoth 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.

  • Exact electrical match for reverse standoff voltage (28.2 V) and maximum clamping voltage (45.7 V)
  • Slightly higher peak pulse current rating (13.3 A vs 13.1 A) provides additional safety margin
  • Identical DO-214AA (SMB) footprint with same pinout (Pin 1: Cathode, Pin 2: Anode)

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.

  • Same manufacturer (STMicroelectronics) simplifies procurement and qualification processes
  • Slightly higher peak pulse current handling (13.8 A vs 13.1 A) for better surge protection
  • Fully compatible DO-214AA package with identical physical mounting and pin configuration
  • Working reverse standoff voltage is marginally lower (28.0 V vs 28.2 V)
  • Minimum breakdown voltage is slightly lower (31.1 V vs 31.4 V)
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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.

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