Alternatives to onsemi SMCJ12A
onsemi SMCJ12A and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 SMCJ12Aonsemi |  SMCJ12A-E3/57TVishay General Semiconductor - Diodes Division |  SMCJ12ALittelfuse Inc. | +3more | |
|---|---|---|---|---|
| FFF Compatibility | Both components share the exact 2-pin DO-214AB (SMC) layout where Pin 1 is the Cathode (indicated by a band) and Pin 2 is the Anode, requiring zero PCB layout modifications.Both devices feature identical DO-214AB (SMC) package dimensions and surface-mount style.All critical electrical parameters match exactly, including a 12V working standoff voltage, 13.3V minimum breakdown voltage, 19.9V maximum clamping voltage, and 1500W peak pulse power capability. | Both devices use the standard 2-pin DO-214AB (SMC) package with Pin 1 designated as Cathode (via polarity band) and Pin 2 as Anode.The physical dimensions, mounting style, and footprint are entirely identical in accordance with the DO-214AB mechanical specification.All key electrical parameters (12V reverse standoff, 13.3V min breakdown, 19.9V clamp, 1500W peak power) are identical. | ||
 AI Summary | SMCJ12A by onsemi: 19.9V Clamp 75.4A Ipp Tvs Diode Surface Mount DO-214AB (SMC). | The Vishay TransZorb SMCJ12A-E3/57T is a direct, industry-standard drop-in equivalent for the Taiwan Semiconductor device. It offers identical electrical parameters, peak pulse power handling, and mechanical packaging under a highly reputable product family. This makes it an ideal primary second source with no design risk.
| The Littelfuse SMCJ12A is a direct, industry-standard second-source replacement. It provides identical transient voltage protection capabilities, peak pulse power dissipation, and form factor, ensuring seamless substitution on the existing circuit board.
| |
| Lifecycle Status | Active | Active | Active | |
| Market Availability | In stock | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| Description | 19.9V Clamp 75.4A Ipp Tvs Diode Surface Mount DO-214AB (SMC) | 19.9V Clamp 75.4A Ipp Tvs Diode Surface Mount DO-214AB (SMCJ) | 19.9V Clamp 75.4A Ipp Tvs Diode Surface Mount DO-214AB (SMC) | |
| Manufacturer | onsemi | Vishay General Semiconductor - Diodes Division | Littelfuse Inc. | |
| Type | Transient Voltage Suppressors (TVS) | Transient Voltage Suppressors (TVS) | Transient Voltage Suppressors (TVS) | |
| Datasheet | Open | Open | Open | |
| Lead Time | 19 weeks | 18 weeks | 19 weeks | |
| Country of Origin | CN, TW | - | - | |
| 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-214AB, SMC | - | - | |
| Power - Peak Pulse | 1500W (1.5kW) | - | - |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
| SMAJ12ADiodes Incorporated | Discontinued | Obsolete | 6Alternatives availableSee Alternatives |
 SMBJ51Aonsemi | In stock | Active | 4Alternatives availableSee Alternatives |
 SMCJ5.0ALittelfuse | In stock | Obsolete | 6Alternatives availableSee Alternatives |
 SMCJ48ADiodes Incorporated | In stock | Obsolete | 5Alternatives availableSee Alternatives |
| SMBJ24ADiodes Incorporated | Discontinued | Obsolete | 7Alternatives availableSee Alternatives |
| SMBJ18ADiodes Incorporated | Discontinued | Obsolete | 3Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The onsemi SMCJ12A 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 onsemi SMCJ12A are the SMCJ12A-E3/57T (Vishay General Semiconductor - Diodes Division) and the SMCJ12A (Littelfuse Inc.), out of 5 matched alternatives in total. Each is compared against the original on fit, form and function in the table above.
Yes. The leading alternatives to the SMCJ12A are fit-, form- and function-compatible — the same package and pinout with matching key electrical specifications — so they drop in without PCB changes. Always confirm the parameters critical to your design against the alternative's datasheet before committing.
The SMCJ12A (onsemi) 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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