Is there a pin-compatible replacement for BSMD1812-400-6V?

Yes, BSMD1812-400-12V is a pin-compatible replacement in the same 1812 package. While it fits the board, you must review the electrical difference in max fault current before using it.

What risks should I check before replacing BSMD1812-400-6V?

The main risks are electrical. Check for 1) Mismatched hold/trip currents, which change the protection level, and 2) A lower maximum fault current rating, which could cause the fuse to fail under a severe short circuit.

BSMD1812-400-6V Alternatives, Datasheet & Cross Reference | BHFUSE

Finding a substitute for the BHFUSE BSMD1812-400-6V PTC fuse requires matching the 1812 package, 4A hold current, and 8A trip current. Key differences in voltage and max fault current ratings must be reviewed.

AI replacement insight

Electrical riskmedium

Substitutes may have different hold currents or a lower max fault current rating.

Package risklow

Multiple candidates are available in the same 1812 package.

Can it be replaced directly?

No drop-in replacement is confirmed. BSMD1812-400-12V is the closest functional match but has a lower max fault current (40A vs 100A) which requires engineering review.

Best replacement path

BSMD1812-400-12V is the best path, requiring verification of the system's maximum possible fault current against its 40A rating.

Main risk

The primary risk is using a substitute with a lower maximum fault current rating, which could lead to device failure in a short-circuit event.

Recommended alternatives

A form, fit, and functional alternative with the same hold/trip current but a lower max fault current rating.

View details

Alternative comparison matrix

Feature / factor	BSMD1812-400-6V	BSMD1812-400-12V	SMD1812-500-16V	Compatibility / risk
Package	1812	1812	1812	1812 — Same package ensures form and fit.; SMD1812-500-16V: Same package ensures form and fit.
Current	100A	40A	5.0A	40A / 5.0A — Max fault current is significantly lower.; SMD1812-500-16V: Higher hold current changes protection level.
Voltage	6.0V	12.0V	16.0V	12.0V / 16.0V — Higher voltage rating is a safe upgrade.; SMD1812-500-16V: Higher voltage rating is a safe upgrade.
Power	2.0W	2.0W	1.5W	2.0W / 1.5W — Power dissipation matches.; SMD1812-500-16V: Lower power dissipation may affect trip time.

Application & sourcing insights

Questions & answers

The best alternative is BSMD1812-400-12V, which matches the hold current and package. However, its maximum fault current rating is lower (40A vs 100A), which must be verified for your application.