Is there a pin-compatible replacement for B540C?

Yes, several pin-compatible replacements in the same SMC package exist. The B560C is a strong candidate, as are parts like the SS1060 and SS10100, though electrical parameters like forward voltage must be verified.

What risks should I check before replacing B540C?

When replacing B540C, check the forward voltage (Vf) of the substitute. A higher Vf than the original's 0.55V will increase power loss and heat. Also, ensure the substitute is a Schottky diode, not a standard or ultrafast type.

B540C Alternatives, Datasheet & Cross Reference | FUXINSEMI

B540C is a 40V, 5A Schottky diode in an SMC package, used in power applications. The best alternative is the B560C, an upgrade from the same series. Other cross-vendor options exist but require checking forward voltage.

AI replacement insight

Package risklow

All suggested alternatives use the same SMC (DO-214AB) package.

Electrical riskmedium

Most alternatives have a higher forward voltage (Vf), which increases power loss and heat.

Sourcing risklow

Multiple cross-vendor options are available, improving supply chain resilience.

Can it be replaced directly?

Yes, the FUXINSEMI B560C is a near-direct replacement for the B540C, sharing the same package, current rating, and manufacturer series, with an increased voltage rating.

Best replacement path

The B560C from the same manufacturer (FUXINSEMI) is the best replacement, offering a direct voltage upgrade to 60V with otherwise similar parameters.

Main risk

The primary risk when substituting B540C is an increase in forward voltage (Vf), which can lead to higher power dissipation and require thermal re-evaluation.

Recommended alternatives

Upgrade path from the same manufacturer with a higher voltage rating (60V) and identical package.

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Alternative comparison matrix

Feature / factor	B540C	B560C	SS1060	SS10100	Compatibility / risk
Package	SMC(DO-214AB)	SMC (DO-214AB)	-	-	SMC (DO-214AB) — Package matches, ensuring form and fit.
Voltage	40V	60V	-	-	100V — Significantly higher voltage rating.
Current	5A	5A	-	-	10A — Higher current rating provides more margin.
Forward Voltage	0.55V @ 5A	0.70V @ 5A	-	-	0.75V @ 10A — Higher Vf will increase power loss. Value at 5A needs checking.
Manufacturer	FUXINSEMI	FUXINSEMI	-	-	FUXINSEMI — Same manufacturer simplifies qualification.

Application & sourcing insights

Questions & answers

The FUXINSEMI B560C is the best alternative. It is part of the same product family with a higher voltage rating (60V vs 40V) and a nearly identical electrical profile.