Alternatives to Littelfuse 1.5SMC33AT3G
Littelfuse 1.5SMC33AT3G 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 Littelfuse 1.5SMC33AT3G
 1.5SMC33AT3GLittelfuse |  1.5SMC33ALittelfuse Inc. | 1.5SMC33ABourns Inc. | +5more | |
|---|---|---|---|---|
| FFF Compatibility | The part utilizes the identical DO-214AB (SMC) package footprint with the exact same 2-pin unidirectional layout (Cathode polarity band on pin 1, Anode on pin 2).Physical package outline, lead spacing, and component dimensions match the original component perfectly.All electrical characteristics (1500W peak pulse power, 28.2V standoff voltage, 31.4V breakdown voltage, and 45.7V clamping voltage) are fully identical. | The part uses the standard DO-214AB (SMC) package and exact 2-pin polarity configuration (Cathode band on pin 1, Anode on pin 2).Complies with standard JEDEC DO-214AB dimensions, ensuring complete mechanical interchangeability.Offers matching peak power (1500W), standoff voltage (28.2V), breakdown voltage (31.4V Min), and clamping voltage (45.7V Max). | ||
 AI Summary | 1.5SMC33AT3G by Littelfuse: 45.7V Clamp 33A Ipp Tvs Diode Surface Mount SMC. | This is the direct, active manufacturer replacement for the obsolete onsemi 1.5SMC33AT3G, following Littelfuse's acquisition of the product line. It offers fully identical electrical performance, footprint compatibility, and mechanical dimensions, making it a seamless drop-in replacement.
| This is a high-reliability second-source alternative from Bourns Inc. It perfectly matches the original specifications across all primary, secondary, and safety ratings with no compromises, allowing a straightforward drop-in transition on existing board layouts.
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| Lifecycle Status | Obsolete | Active | Active | |
| Market Availability | Discontinued | Non-stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
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Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 1SMC30AT3GLittelfuse | Discontinued | Obsolete | 6Alternatives availableSee Alternatives |
| 1SMC5.0AT3GLittelfuse | Discontinued | Obsolete | 7Alternatives availableSee Alternatives |
 1SMC48AT3GLittelfuse | Discontinued | Obsolete | 6Alternatives availableSee Alternatives |
| 1SMC18AT3GLittelfuse | Discontinued | Obsolete | 5Alternatives availableSee Alternatives |
 1SMB58CAT3GLittelfuse | Discontinued | Obsolete | 6Alternatives availableSee Alternatives |
| 1SMB18CAT3GLittelfuse | Discontinued | Obsolete | 7Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The Littelfuse 1.5SMC33AT3G is marked obsolete, so the manufacturer has discontinued it and any remaining supply is limited to distributor stock. The qualified second sources on this page are active parts you can design in today.
The closest qualified second sources for the Littelfuse 1.5SMC33AT3G are the 1.5SMC33A (Littelfuse Inc.) and the 1.5SMC33A (Bourns Inc.), out of 7 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 1.5SMC33AT3G 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 1.5SMC33AT3G (Littelfuse) 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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