Is there a pin-compatible replacement for FSMD016-1206-R?

Several parts like Littelfuse RF1344-000 and TECHFUSE nSMD016-48V share the same 1206 package. While likely pin-compatible, differences in trip current or resistance mean they are not guaranteed drop-in replacements without engineering review.

What risks should I check before replacing FSMD016-1206-R?

When replacing FSMD016-1206-R, check the hold current (must be >= circuit's max normal current), trip current (affects when it protects), and max voltage (must be > circuit voltage). Also verify the time-to-trip curve.

FSMD016-1206-R Alternatives, Datasheet & Cross Reference | FUZETEC

FSMD016-1206-R is a 48V, 160mA PTC resettable fuse in a 1206 package. Alternatives exist from manufacturers like Littelfuse and TECHFUSE, but require careful comparison of trip current and other dynamic characteristics before substitution.

AI replacement insight

Electrical risklow

Key static parameters like voltage and hold current have strong matches available.

Package risklow

All top candidates use the same 1206 surface-mount package.

Sourcing riskmedium

The target part has an unknown lifecycle; alternatives from major brands like Littelfuse may offer better availability.

Can it be replaced directly?

No guaranteed direct drop-in replacement has been verified. However, Littelfuse RF1344-000 is a very strong candidate that is likely compatible after datasheet review.

Best replacement path

The Littelfuse RF1344-000 is the most promising alternative, as it matches the critical voltage, hold current, trip current, and package specifications.

Main risk

The primary risk is a mismatch in dynamic characteristics, such as the time-to-trip curve and post-trip resistance, which can affect system behavior under fault conditions.

Recommended alternatives

Strong alternative from Littelfuse with matching hold current, trip current, voltage, and 1206 package.

View details

Alternative comparison matrix

Feature / factor	FSMD016-1206-R	RF1344-000	nSMD016-48V	nSMD020-48V	Compatibility / risk
Package	1206	1206	1206	1206	1206 — Same package size ensures physical fit.; nSMD016-48V: Same package size ensures physical fit.; nSMD020-48V: Same package size ensures physical fit.
Voltage	48V	48V	48V	48V	48V — Maximum voltage rating matches.; nSMD016-48V: Maximum voltage rating matches.; nSMD020-48V: Maximum voltage rating matches.
Current	0.45A	0.45A	0.37A	0.20A	0.45A / 0.37A / 0.20A — Trip current (I_trip) matches.; nSMD016-48V: Trip current is lower, may trip earlier.; nSMD020-48V: Hold current is higher, reducing protection.
Resistance	Not specified	1.1Ω - 5.0Ω	-	-	1.1Ω - 5.0Ω — Resistance range differs, requires datasheet review.

Application & sourcing insights

Questions & answers

The Littelfuse RF1344-000 is a strong candidate, matching the key 48V voltage, 160mA hold current, and 450mA trip current in the same 1206 package. However, full datasheet review is essential.