Alternatives to Littelfuse SMD-100
Littelfuse SMD-100 and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 SMD-100Littelfuse |  SMD100F-2Littelfuse Inc. |  MF-SM100-2Bourns Inc. | +3more | |
|---|---|---|---|---|
| FFF Compatibility | Identical 2-terminal 2920 (7351 metric) footprint requiring no changes to the existing land pattern.Identical physical length, width, and maximum thickness profiles.Matches original electrical baseline specs: 1.1A hold current, 2.2A trip current, 30V max, and 40A max fault current. | Shares the standard 2920 land pattern but has slightly different terminal pad geometry.Package dimensions are slightly larger (7.98mm x 5.44mm vs 7.36mm x 5.12mm), though compatible with the same footprint.Identical hold current of 1.1A, trip current of 2.2A, and max voltage of 30V. | ||
 AI Summary | SMD-100 by Littelfuse: Polymeric PTC Resettable Fuse 30V 1.1 A Ih Surface Mount 2920 (7351 Metric). | This is the official, direct lead-free (RoHS compliant) successor to the obsolete lead-bearing SMD-100 series from the same manufacturer. It maintains identical electrical characteristics, package dimensions, and footprint land patterns, making it a low-risk, true drop-in replacement.
| This is a highly reliable second-source alternative from Bourns. It is fully compatible electrically with 1.1A hold and 30V max ratings, but has slightly larger physical housing dimensions that still mount onto standard 2920 landing pads.
| |
| Lifecycle Status | Obsolete | Active | Active | |
| Market Availability | Discontinued | In stock | In stock | |
| REACH | REACH | REACH | REACH | |
| RoHS | RoHS | RoHS | RoHS | |
| Description | Polymeric PTC Resettable Fuse 30V 1.1 A Ih Surface Mount 2920 (7351 Metric) | Polymeric PTC Resettable Fuse 30V 1.1 A Ih Surface Mount 2-SMD | Polymeric PTC Resettable Fuse 30V 1.1 A Ih Surface Mount 2-SMD | |
| Manufacturer | Littelfuse | Littelfuse Inc. | Bourns Inc. | |
| Type | PTC Resettable Fuses | PTC Resettable Fuses | PTC Resettable Fuses | |
| Datasheet | Open | Open | Open | |
| Lead Time | Unknown | 17 weeks | 10 weeks | |
| Country of Origin | - | - | - | |
| Export Control Class Number | EAR99 | EAR99 | EAR99 | |
| HTSUS Code | 8533.40.8070 | - | - | |
| Moisture Sensitivity Level | 2A (4 Weeks) | - | - | |
| Type | Polymeric | - | - | |
| Time to Trip | 500 ms | - | - | |
| Current - Max | 40 A | - | - | |
| Mounting Type | Surface Mount | - | - | |
| Voltage - Max | 30V | - | - | |
| Package / Case | 2920 (7351 Metric) | - | - | |
| Thickness (Max) | 0.060" (1.52mm) | - | - | |
| Size / Dimension | 0.200" L x 0.180" W (5.08mm x 4.58mm) | - | - |
Unlock all 5 alternatives
- Find & compare verified second sources
- Spot risk early with real-time part monitoring
- Stay compliant and production-ready
Related parts
| Part | Market availability | Lifecycle | Alternatives available |
|---|---|---|---|
 SMD100-2Littelfuse | Discontinued | Obsolete | 3Alternatives availableSee Alternatives |
You searched one part. Parter watches your whole BOM.
All your BOM, at once
Parter maps every line to live stock, lead time, lifecycle and compliance data across the entire market — not part by part.
Hear about problems before they hit production
Allocation, EOL and last-time-buy notices surface the moment they appear, not when your buyer's PO bounces.
Qualified replacements in minutes, not days
Every at-risk line gets form-fit-function matches like the ones above — deltas flagged, evidence attached. Review, push to your BOM, and Parter starts watching the new part too.
Frequently asked questions
Yes. The Littelfuse SMD-100 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 SMD-100 are the SMD100F-2 (Littelfuse Inc.) and the MF-SM100-2 (Bourns Inc.), out of 5 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 SMD-100 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 SMD-100 (Littelfuse) is a part in the PTC Resettable Fuses category. This page lists qualified, cross-referenced replacements for it with a side-by-side comparison.
Schedule a demo
See Parter in action
Discover how Parter can help your hardware team:
- Streamline your hardware operations with AI
- Detect and prevent lifecycle disruptions
- Accelerate product development
- Stay compliant and production-ready