Is there a pin-compatible replacement for BSMD1812-020-30V?

While several parts share the 1812 package and 2-pin layout, none are verified as direct drop-in replacements without review. Candidates like SMD1812P020TF have different initial resistance, which can affect circuit performance.

What risks should I check before replacing BSMD1812-020-30V?

The primary risks are changes in hold current (Ih), trip current (It), and initial resistance (Rmin). A higher hold current reduces protection, while higher resistance increases voltage drop and power loss during normal operation.

BSMD1812-020-30V Alternatives, Datasheet & Cross Reference | BHFUSE

BSMD1812-020-30V is a 30V, 200mA hold current PTC resettable fuse in an 1812 package. Key alternatives exist with identical ratings, but require checking for differences in initial resistance.

AI replacement insight

Electrical riskmedium

Higher initial resistance in top candidates requires evaluation.

Package risklow

All top candidates match the 1812 package.

Can it be replaced directly?

No direct, verified drop-in replacement has been identified. The closest matches require review of their higher initial resistance.

Best replacement path

Use SMD1812P020TF or SMD1812B020TF after verifying the impact of higher initial resistance on your circuit.

Main risk

The main risk is increased voltage drop and power loss due to higher initial resistance in the best-fit alternatives.

Recommended alternatives

A form, fit, and functional alternative from Yageo with identical hold/trip currents but higher initial resistance.

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Alternative comparison matrix

Feature / factor	BSMD1812-020-30V	SMD1812B020TF	SMD1812P020TF	SMD1812P030TF	Compatibility / risk
Package	1812	1812 (4532 metric)	1812	1812	1812 (4532 metric) — Package matches.; SMD1812P020TF: Package matches.; SMD1812P030TF: Package matches.
Voltage	30V	30V	30V	30V	30V — Max voltage matches.; SMD1812P020TF: Max voltage matches.; SMD1812P030TF: Max voltage matches.
Current	40A	100A	100A	30A	100A / 30A — Higher max fault current is a safe upgrade.; SMD1812P020TF: Higher max fault current is a safe upgrade.; SMD1812P030TF: Lower max fault current is a downgrade.
Resistance	0.35Ω	0.8Ω	0.8Ω	-	0.8Ω — Higher initial resistance increases voltage drop.; SMD1812P020TF: Higher initial resistance increases voltage drop.

Application & sourcing insights

Questions & answers

SMD1812P020TF by PTTC and SMD1812B020TF by Yageo are strong alternatives with matching voltage, hold current, and trip current. However, their higher initial resistance must be evaluated for your application.