Is there a pin-compatible replacement for FSMD110-33R?

Yes, several alternatives like BNstar SMD1812-110C-33V share the same 1812 package and 2-pin layout. However, critical electrical parameters like max fault current (Imax) may differ, so datasheet review is essential before substitution.

What risks should I check before replacing FSMD110-33R?

Key risks include mismatches in hold current (Ih), which affects the circuit's protection point, and max fault current (Imax), which determines if the fuse can survive a short-circuit. Also check trip time and post-trip resistance (R1max).

FSMD110-33R Alternatives, Datasheet & Cross Reference | FUZETEC

FSMD110-33R is a 1.1A, 33V PTC resettable fuse in an 1812 package. Finding a substitute requires careful matching of hold current, voltage, and especially the max fault current rating to ensure circuit safety.

AI replacement insight

Electrical riskhigh

Candidates have different hold currents or significantly lower max fault current ratings.

Package risklow

All viable candidates share the same 1812 package.

Can it be replaced directly?

No direct drop-in replacement has been identified without caveats. All viable alternatives have parametric differences in hold current or max fault current that require engineering review.

Best replacement path

Use BNstar SMD1812-110C-33V if the max fault current is under 40A. Otherwise, consider TECHFUSE mSMD150-33V but verify the higher 1.5A hold current is safe for the application.

Main risk

The primary risk is a mismatch in max fault current (Imax), which could lead to fuse failure and subsequent damage to the protected circuit.

Recommended alternatives

Matches package, hold current, and voltage, but has a significantly lower max fault current rating that requires engineering review.

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Alternative comparison matrix

Feature / factor	FSMD110-33R	SMD1812-110C-33V	mSMD150-33V	Compatibility / risk
Package	1812	1812	1812	1812 — Same form factor.; mSMD150-33V: Same form factor.
Current	100A	40A	100A	40A / 100A — Max fault current (Imax) is significantly lower.; mSMD150-33V: Max fault current (Imax) matches.
Voltage	33V	33V	33V	33V — Max voltage rating matches.; mSMD150-33V: Max voltage rating matches.
Resistance	0.200Ω	0.250Ω	0.160Ω	0.250Ω / 0.160Ω — Post-trip resistance (R1max) is higher.; mSMD150-33V: Post-trip resistance (R1max) is better.

Application & sourcing insights

Questions & answers

BNstar SMD1812-110C-33V is a strong functional match for hold current and voltage, but has a lower max fault current rating (40A vs 100A) requiring review. TECHFUSE mSMD150-33V has a matching fault current rating but a higher hold current (1.5A).