Alternatives to Littelfuse 1SMB18CAT3G
Littelfuse 1SMB18CAT3G and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 1SMB18CAT3GLittelfuse |  SMBJ18CALittelfuse Inc. |  SMBJ18CA-13-FDiodes Incorporated | +5more | |
|---|---|---|---|---|
| FFF Compatibility | Both parts share the standard DO-214AA (SMB) footprint with a 2-terminal bidirectional layout, requiring zero PCB layout modifications.The package shape, dimensions, and J-bend leads are identical to the original part.All electrical characteristics, including reverse standoff voltage, breakdown voltage, clamping voltage, and peak power rating, meet or exceed the original specifications. | Uses the standard 2-terminal DO-214AA (SMB) footprint for direct mounting on the existing PCB land pattern.Physical dimensions and lead frame shape are fully interchangeable with the target part.The lower operating temperature limit is -55°C, which is slightly narrower than the original part's -65°C limit. | ||
 AI Summary | 1SMB18CAT3G by Littelfuse: 29.2V Clamp 20.5A Ipp Tvs Diode Surface Mount SMB. | This is the direct, active manufacturer-recommended replacement from Littelfuse. It offers identical or slightly superior electrical performance and the same operating temperature range in a fully pin-compatible SMB package.
| A highly popular second-source alternative from Diodes Inc. It matches the original's electrical protection performance but has a slightly narrower low-temperature limit of -55°C.
| |
| Lifecycle Status | Obsolete | Active | Active | |
| Market Availability | Discontinued | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| Description | 29.2V Clamp 20.5A Ipp Tvs Diode Surface Mount SMB | 29.2V Clamp 20.6A Ipp Tvs Diode Surface Mount DO-214AA (SMBJ) | 29.2V Clamp 20.5A Ipp Tvs Diode Surface Mount SMB | |
| Manufacturer | Littelfuse | Littelfuse Inc. | Diodes Incorporated | |
| Type | Transient Voltage Suppressors (TVS) | Transient Voltage Suppressors (TVS) | Transient Voltage Suppressors (TVS) | |
| Datasheet | Open | Open | Open | |
| Lead Time | 30 weeks | 14 weeks | 12 weeks | |
| Country of Origin | - | - | - | |
| 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-214AA, SMB | - | - | |
| Power - Peak Pulse | 600W | - | - | |
| Operating Temperature | -65°C ~ 150°C (TJ) | - | - | |
| Power Line Protection | No | - | - | |
| Bidirectional Channels | 1 | - | - |
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 1SMB18CAT3onsemi | Discontinued | Obsolete | 7Alternatives availableSee Alternatives |
| 1SMB58CAT3GLittelfuse | Discontinued | Obsolete | 6Alternatives availableSee Alternatives |
 1SMB48AT3GLittelfuse | Discontinued | Obsolete | 9Alternatives availableSee Alternatives |
| 1SMB51AT3GLittelfuse | Discontinued | Obsolete | 6Alternatives availableSee Alternatives |
 1SMC18AT3GLittelfuse | Discontinued | Obsolete | 5Alternatives availableSee Alternatives |
 1SMB24AT3GLittelfuse | Discontinued | Obsolete | 8Alternatives availableSee Alternatives |
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Frequently asked questions
Yes. The Littelfuse 1SMB18CAT3G 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 1SMB18CAT3G are the SMBJ18CA (Littelfuse Inc.) and the SMBJ18CA-13-F (Diodes Incorporated), 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 1SMB18CAT3G 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 1SMB18CAT3G (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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