Alternatives to Littelfuse SMD100-2
Littelfuse SMD100-2 and its qualified second sources, compared on form/fit/function, stock, lifecycle and price — the same checks Parter runs inside a BOM.
 SMD100-2Littelfuse | SMD100F-2Littelfuse Inc. |  MF-SM100-2Bourns Inc. | +1more | |
|---|---|---|---|---|
| FFF Compatibility | Utilizes the identical 2-SMD 2920 surface-mount layout, matching the physical landing pattern and pinout assignments.Matches the original package dimensions of 7.36mm x 5.12mm with a 3.00mm maximum thickness.Shares the exact electrical characteristics including 1.1A hold current, 2.2A trip current, and 30V maximum rating with modern lead-free/RoHS compliancy. | Pins and landing pads align perfectly with the standard 2-SMD 2920 land pattern.Maintains the 2920 shape profile (7.31mm x 5.44mm) and 3.00mm maximum height.Provides matching 1.1A hold/2.2A trip current thresholds and 30V max voltage while improving the max interrupt current from 40A to 80A. | ||
 AI Summary | SMD100-2 by Littelfuse: Polymeric PTC Resettable Fuse 30V 1.1 A Ih Surface Mount 2920 (7351 Metric). | This is the official RoHS-compliant lead-free replacement for the obsolete SMD100-2. It offers identical electrical performance and matching physical dimensions, making it a seamless drop-in transition without any board modification.
| The Bourns Multifuse series is a highly reliable, automotive-qualified alternative. It matches the original's primary hold and trip thresholds, but significantly increases the fault current ceiling to 80A.
| |
| 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 3 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 |
|---|---|---|---|
 SMD-100Littelfuse | Discontinued | Obsolete | 5Alternatives 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 SMD100-2 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 SMD100-2 are the SMD100F-2 (Littelfuse Inc.) and the MF-SM100-2 (Bourns Inc.), out of 3 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 SMD100-2 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 SMD100-2 (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