Is there a pin-compatible replacement for mSMD050-33V?

Several parts share the 1812 package, making them physically compatible. However, no candidates match the critical 0.5A hold current, so they are not electrically pin-compatible without design review.

What risks should I check before replacing mSMD050-33V?

Key risks include changes in hold current, which affects the trip point, and a lower maximum fault current (Imax), which could cause the fuse to fail unsafely during a short circuit.

mSMD050-33V Alternatives, Datasheet & Cross Reference | TECHFUSE

mSMD050-33V is a 33V, 0.5A hold current PTC resettable fuse in an 1812 package. Finding a substitute requires matching hold current, trip characteristics, and max fault current to ensure proper circuit protection.

AI replacement insight

Electrical riskhigh

Mismatched hold current and lower max fault current pose significant safety and performance risks.

Package risklow

Alternatives share the same 1812 package, ensuring physical compatibility.

Can it be replaced directly?

No direct, drop-in replacements for mSMD050-33V were found. All reviewed alternatives have different current protection levels requiring engineering validation.

Best replacement path

Search for PTC fuses with Vmax≥33V, Ih≈0.5A, Imax≥100A in an 1812 package. No direct cross was identified in this review.

Main risk

The primary risk is incorrect overcurrent protection due to mismatched hold currents and potential fuse failure from a lower max fault current rating.

Recommended alternatives

A functional alternative in the same 1812 package, but with different current protection characteristics that require careful evaluation.

View details

Alternative comparison matrix

Feature / factor	mSMD050-33V	FSMD075-33R	SMD1812-075C-33V	Compatibility / risk
Package	1812	1812	1812	1812 — Form factor matches.; SMD1812-075C-33V: Form factor matches.
Voltage	33.0V	33.0V	33.0V	33.0V — Maximum voltage rating matches.; SMD1812-075C-33V: Maximum voltage rating matches.
Current	100A	40A	40A	40A — Max fault current is significantly lower.; SMD1812-075C-33V: Max fault current is significantly lower.
Power	0.8W	1.0W	0.8W	1.0W / 0.8W — Typical power dissipation is higher.; SMD1812-075C-33V: Typical power dissipation matches.

Application & sourcing insights

Questions & answers

No direct drop-in replacements were found. Alternatives like FSMD075-33R exist but have a higher hold current (0.75A) and lower fault current rating, requiring circuit protection analysis.