Is there a pin-compatible replacement for BSMD0805-003-30V?

Yes, several 0805 package PTC fuses are pin-compatible, such as SMD0805-004C-60V. However, their electrical characteristics, especially hold and trip currents, differ and require careful engineering review before substitution.

What risks should I check before replacing BSMD0805-003-30V?

The main risk is inadequate overcurrent protection. Verify the candidate's hold current (Ih), trip current (It), and maximum voltage (Vmax). A higher hold/trip current may not protect the downstream circuit. Also check initial resistance.

BSMD0805-003-30V Alternatives, Datasheet & Cross Reference | BHFUSE

BSMD0805-003-30V is a 30V, 30mA hold current PTC resettable fuse in an 0805 package. Finding a suitable replacement requires closely matching the critical hold and trip current ratings to ensure proper circuit protection.

AI replacement insight

Electrical riskhigh

Mismatched hold and trip currents can lead to inadequate circuit protection.

Package risklow

Candidates share the common 0805 package, ensuring physical compatibility.

Can it be replaced directly?

No direct, drop-in replacement has been identified. All potential candidates have different hold and trip currents, which alters the circuit's protection characteristics and requires engineering validation.

Best replacement path

Search for a 0805 PTC fuse with Vmax ≥ 30V, Ih ≈ 30mA, and It ≈ 90mA. The closest identified candidate, SMD0805-004C-60V, requires review for its higher current ratings.

Main risk

Using a substitute with a higher hold/trip current may result in failure to protect the downstream circuit from overcurrent conditions.

Recommended alternatives

A potential alternative with a higher voltage rating but also higher hold and trip currents, requiring engineering review.

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Alternative comparison matrix

Feature / factor	BSMD0805-003-30V	SMD0805-004C-60V	SMD0805-005C-60V	Compatibility / risk
Package	0805	0805	0805	0805 — Same package and pin count.; SMD0805-005C-60V: Same package and pin count.
Voltage	30V	60V	60V	60V — Higher voltage rating provides more margin.; SMD0805-005C-60V: Higher voltage rating provides more margin.
Current	90mA	120mA	150mA	120mA / 150mA — Higher trip current (It).; SMD0805-005C-60V: Significantly higher trip current (It).
Resistance	6Ω / 50Ω	5.0Ω / 40.0Ω	1.5Ω / 20.0Ω	5.0Ω / 40.0Ω / 1.5Ω / 20.0Ω — Initial/Post-trip resistance values are similar.; SMD0805-005C-60V: Initial/Post-trip resistance values are different.

Application & sourcing insights

Questions & answers

BNstar's SMD0805-004C-60V is a potential alternative, but has a higher hold current (40mA vs 30mA) and trip current (120mA vs 90mA). This change in protection level must be verified for your specific application.