Is there a pin-compatible replacement for BSMD1206L-300?

While several parts share the 1206 package, no direct pin-to-pin replacement has been verified. SMD1206-300-12V is a close candidate that is form and fit compatible, but requires engineering review due to different post-trip resistance characteristics.

What risks should I check before replacing BSMD1206L-300?

When replacing BSMD1206L-300, first verify the hold current (Ihold) and trip current (Itrip) match. Second, check that the initial resistance (Rmin) is similar to avoid excess voltage drop. Finally, ensure the max voltage rating is equal or higher.

BSMD1206L-300 Alternatives, Datasheet & Cross Reference | BHFUSE

BSMD1206L-300 is a 1206 PTC resettable fuse with a 3A hold current and 6V rating. Finding a substitute requires matching the hold current and package, while higher voltage ratings are acceptable upgrades. Pay close attention to resistance values.

AI replacement insight

Electrical riskhigh

PTC fuse performance is sensitive to hold current, trip current, and resistance values.

Package risklow

The 1206 package is standardized, ensuring physical compatibility.

Can it be replaced directly?

No verified direct drop-in replacement is available. The closest candidate, SMD1206-300-12V, requires engineering review due to different secondary parameters.

Best replacement path

Evaluate BNstar SMD1206-300-12V as a functional alternative, focusing on the impact of its higher post-trip resistance.

Main risk

The primary risk is selecting a part with incorrect hold current or significantly different initial resistance, which can lead to improper circuit protection or performance issues.

Recommended alternatives

Strong functional alternative with matching hold current and higher voltage rating. Review post-trip resistance.

View details

Alternative comparison matrix

Feature / factor	BSMD1206L-300	SMD1206-300-12V	SMD1206-300C-8V	Compatibility / risk
Package	1206	1206	1206	1206 — Same package size and pin count.; SMD1206-300C-8V: Same package size and pin count.
Current	3.0 A	3.0 A	3.0 A	3.0 A — Hold current (Ihold) matches.; SMD1206-300C-8V: Hold current (Ihold) matches.
Voltage	6.0 V	12.0 V	8.0 V	12.0 V / 8.0 V — Higher voltage rating provides more design margin.; SMD1206-300C-8V: Higher voltage rating provides more margin.
Resistance	0.014 Ω	0.030 Ω	0.010 Ω	0.030 Ω / 0.010 Ω — Post-trip resistance (R1max) is higher, may affect reset time.; SMD1206-300C-8V: Initial resistance is 5x higher, increasing voltage drop.
Power	1.2 W	-	1.0 W	1.0 W — Lower power dissipation rating.

Application & sourcing insights

Questions & answers

BNstar's SMD1206-300-12V is a strong functional alternative. It has the same 3A hold current and 1206 package, with a higher 12V rating. However, its post-trip resistance differs and should be verified in your application.