RF1343-000
Littelfuse
Needs validationlow risk
Strong alternative from Littelfuse with matching package, voltage, and hold current. Datasheet review recommended.
Best Alternatives to FSMD012-1206-R
FSMD012-1206-R is a 48V, 120mA PTC resettable fuse in a 1206 package. Find datasheet-verified alternatives and functional replacements from Littelfuse and FUZETEC.
AI replacement insight
Electrical riskmedium
Using a part with a higher hold current can leave the circuit unprotected.
Package risklow
All viable alternatives are in the same 1206 package.
Can it be replaced directly?
Direct replacement for FSMD012-1206-R should use only Datasheet verified or Strong match candidates; many approved options still require engineering review.
Best replacement path
The strongest alternative is Littelfuse RF1343-000, which matches the key 48V voltage and 0.12A hold current ratings in the same 1206 package.
Main risk
The main risk is selecting an alternative with a higher hold current (e.g., 0.16A), which may fail to protect the downstream circuit as intended.
Recommended alternatives
2Alternative comparison matrix
| Feature / factor | FSMD012-1206-R | RF1343-000 | FSMD016-1206-R | Alt 3 | Compatibility / risk |
|---|---|---|---|---|---|
| Package | 1206 | 1206 (3216 Metric) | 1206 | 1206 (3216 Metric) — Form factor matches.; FSMD016-1206-R: Form factor matches. | |
| Voltage | 48V | 48V | 48V | 48V — Maximum voltage rating matches.; FSMD016-1206-R: Maximum voltage rating matches. | |
| Current | 0.39A | 0.39A | 0.45A | 0.39A / 0.45A — Trip current (It) matches.; FSMD016-1206-R: Higher trip current. | |
| Resistance | 1.40 Ohms (min) | unknown | - | unknown — Initial resistance must be verified from datasheet. |
Application & sourcing insights
Questions & answers
Verified drop-in options for FSMD012-1206-R are limited in the current batch. Review candidates marked Strong match or Datasheet verified, and validate package, pinout, and electrical limits before committing a BOM change.