STMicroelectronics SM30T
SM30T variants from STMicroelectronics
SM30T Overview
What changes between part numbers, and what to check before you lock the BOM — TVS Diodes.
SM30T is a STMicroelectronics order-code family — not a single orderable MPN. This page lists 28 variants that share the same core device but differ in suffix fields (package, grade, reel/tube, electrical bin, etc.). Pick the exact full part number; substituting within the family without checking the datasheet often causes assembly or spec mismatches.
Automotive 3000 W TVS in SMC Other listed variants describe: 3kW Unidirectional TVS Diode, 15V Working Voltage, DO-214AB; 3kW Bidirectional TVS Diode, 18.5V Breakdown, SMC, 15V Working.
Suffix examples in this family: 10AY, 12AY, 12CAY, 15AY, 15CAY, 18AY, 18CAY, 19AY. The characters after the base number usually encode package, temperature, or performance grade — compare the variant table column-by-column rather than assuming pin-compatible drops-in.
Example MPNs: SM30T10AY, SM30T12AY, SM30T12CAY, SM30T15AY, SM30T15CAY, SM30T18AY.
Key Features
- Lifecycle mix: ActiveConfirm lifecycle on the exact MPN, not just the base number prefix.
- 28 distinct suffix patternsExamples: 10AY, 12AY, 12CAY, 15AY, 15CAY (+23 more). Decode suffix meaning in the ordering notes under the variant table.
Target Applications
- TVS Diodes — design-in and field replacement
- BOM scrub where only the base prefix is known but suffix is TBD
- Second-source checks when the original MPN is constrained
Ordering Variants
Compare 28 SM30T part numbers by package, electrical parameters, lifecycle, and availability. Use RFQ for stock and lead-time confirmation.
| Part Number | Description | Manufacturer | Lifecycle | RoHS | Availability | Action |
|---|---|---|---|---|---|---|
| SM30T10AY | Automotive 3000 W TVS in SMC | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T12AY | Automotive 3000 W TVS in SMC | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T12CAY | Automotive 3000 W TVS in SMC | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T15AY | Automotive 3000 W TVS in SMC | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T15CAY | Automotive 3000 W TVS in SMC | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T18AY | 3kW Unidirectional TVS Diode, 15V Working Voltage, DO-214AB | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T18CAY | 3kW Bidirectional TVS Diode, 18.5V Breakdown, SMC, 15V Working | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T19AY | Automotive 3000 W TVS in SMC | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T19CAY | Automotive 3000 W TVS in SMC | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T21AY | 3kW Unidirectional TVS Diode, 26V Working Voltage, DO-214AB | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T21CAY | 3kW Bidirectional TVS Diode, 18V Working Voltage, DO-214AB | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T23AY | 3kW Unidirectional TVS Diode, 20V Working Voltage, DO-214AB | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T23CAY | 3kW Bidirectional TVS Diode, 20V Working, DO-214AB, SM | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T26CAY | 3kW Bidirectional TVS Diode, 22V Working Voltage, SMC Package | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T28AY | 3000W Unidirectional TVS Diode, 24V, DO-214AB, 150°C | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T30AY | 3kW Unidirectional TVS Diode, 26V Working Voltage, SMC | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T30CAY | Automotive 3000 W TVS in SMC | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T33CAY | 3kW Bidirectional TVS Diode, 28V Working, 31.1-34.3V Breakdown, SMC | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T35CAY | 30V Bidirectional TVS Diode, 3kW, SMC, AEC-Q101 | STMicroelectronics | Active | Compliant | In Stock | |
| SM30T39AY | 3kW TVS Diode, 33V Reverse Standoff, SMC, Unidirectional | STMicroelectronics | Active | Compliant | In Stock |
Ordering Code Differences
How suffixes on SM30T map to package, grade, and reel options.
SM30T uses a shared prefix; characters after the prefix encode orderable options. Two lines with the same prefix are not drop-in replacements unless the differing columns match your need.
Suffixes seen here: 10AY, 12AY, 12CAY, 15AY, 15CAY, 18AY, 18CAY, 19AY, 19CAY, 21AY (+18 more).
Full MPN examples: SM30T10AY, SM30T12AY, SM30T12CAY, SM30T15AY, SM30T15CAY.
Tip: photograph or copy the reel label — reel diameter, QTY per reel, and moisture sensitivity level (MSL) are often suffix-driven and won't show in the schematic.
How to Choose the Right SM30T TVS Diodes
Match the footprint first
Pull the exact package drawing for your MPN — base-number swaps fail most often at the footprint, not the schematic.
Electrical headroom
Compare voltage and current columns in the variant table. For SM30T, a suffix with lower voltage or current rating will not survive the same circuit without recalculation.
Temp grade letter matters
Commercial (0–70 °C) and industrial (−40–85 °C+) suffixes look similar in the prefix — confirm ambient + self-heating, not just the first page of the datasheet.
Copy the full MPN
Do not BOM only "SM30T" — include the full suffix (e.g. 10AY, 12AY, 12CAY). RFQ with reel/tube preference and required date code.
Technical Specifications
Core parameters for SM30T product family
Identity
Variant Parameters
Source SM30T with Octatronics
Request stock confirmation, lead time, date code, and pricing for all 28 ordering variants from STMicroelectronics. Our team supports active, EOL, and hard-to-find component sourcing.
- Original manufacturer parts with traceability options
- BOM upload and multi-line RFQ support
- Package, grade, and compliance verification
Frequently Asked Questions
Common technical questions about the SM30T product family.