Alternatives to onsemi SMBJ51A
onsemi SMBJ51A 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 onsemi SMBJ51A
 SMBJ51Aonsemi | SMBJ51ALittelfuse Inc. | SMBJ51ABourns Inc. | +2more | |
|---|---|---|---|---|
| FFF Compatibility | Both parts are unidirectional transient voltage suppressors packaged in the standard DO-214AA (SMB) package with matching pin assignments (Pin 1: Cathode with band, Pin 2: Anode).Both utilize the standard DO-214AA (SMB) surface mount footprint, allowing them to mount interchangeably on the same PCB land pattern.Electrical parameters are fully compatible: 600W peak pulse power, 51V standoff voltage, 56.7V minimum breakdown, and 82.4V clamping voltage. | Both parts share the exact same 2-pin DO-214AA (SMB) unidirectional pinout with identical cathode band markings.Both parts conform to the industry standard DO-214AA (SMB) package dimensions and surface mount requirements.All electrical specifications, including peak pulse current (7.3A) and clamping voltage (82.4V), match the Good-Ark device exactly. | ||
 AI Summary | SMBJ51A by onsemi: 82.4V Clamp 7.3A Ipp Tvs Diode Surface Mount DO-214AA (SMB). | This is a direct, drop-in replacement from a top-tier manufacturer. It matches the original's electrical characteristics and mechanical footprint perfectly, with a slightly improved lower-end temperature limit.
| Bourns is a highly reliable alternative supplier offering an identical standard-grade TVS diode. It is a direct drop-in replacement with identical electrical performance and physical dimensions.
| |
| Lifecycle Status | Active | Active | Active | |
| Market Availability | In stock | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
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| —————— —— | ——————— ———— | ————— ——— ———— | ———— —————— | |
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| —— ————— | ———— —————— | —— ————— ——— | ——————— ———— |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
| SMBJ51CADiodes Incorporated | Discontinued | Obsolete | 4Alternatives availableSee Alternatives |
| SMBJ13Aonsemi | Discontinued | Obsolete | 7Alternatives availableSee Alternatives |
| SMBJ18ADiodes Incorporated | Discontinued | Obsolete | 3Alternatives availableSee Alternatives |
| SMBJ58CADiodes Incorporated | Discontinued | Obsolete | 6Alternatives availableSee Alternatives |
| SMBJ18CADiodes Incorporated | Discontinued | Obsolete | 7Alternatives availableSee Alternatives |
 SMBJ100CAonsemi | In stock | Active | 8Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The onsemi SMBJ51A 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 SMBJ51A are the SMBJ51A (Littelfuse Inc.) and the SMBJ51A (Bourns Inc.), out of 4 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 SMBJ51A 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 SMBJ51A (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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