Is there a pin-compatible replacement for B340LB-13-F?

Yes, B340B-13-F and SDT5H100SB-13 are pin-compatible replacements as they use the same 2-pin SMB package. However, their electrical characteristics, especially forward voltage, differ and require engineering review.

What risks should I check before replacing B340LB-13-F?

Before replacing B340LB-13-F, you must check the forward voltage (Vf) of the alternative. A higher Vf will increase power loss and heat, potentially impacting your circuit's efficiency and thermal management.

B340LB-13-F Alternatives, Datasheet & Cross Reference | Diodes Incorporated

B340LB-13-F is a 40V, 3A low-Vf Schottky rectifier in an SMB package. When finding a substitute, focus on matching the Schottky technology and low forward voltage (0.45V) to maintain circuit efficiency.

AI replacement insight

Electrical riskmedium

Increased forward voltage (Vf) in all candidates will increase power loss and heat. This must be verified.

Package risklow

All viable candidates use the same standard SMB package, ensuring mechanical compatibility.

Can it be replaced directly?

B340B-13-F is a near direct replacement for B340LB-13-F. It shares the same package, voltage, and current ratings, but has a slightly higher forward voltage that should be evaluated.

Best replacement path

The best replacement path is B340B-13-F, which offers nearly identical performance with only a minor increase in forward voltage.

Main risk

The primary risk is increased power dissipation due to higher forward voltage (Vf) in alternatives, which could affect efficiency and thermal performance.

Recommended alternatives

A very close alternative in the same SMB package with identical voltage/current ratings and higher surge protection.

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Alternative comparison matrix

Feature / factor	B340LB-13-F	B340B-13-F	SDT5H100SB-13	Compatibility / risk
Package	SMB	SMB	SMB	SMB — Same package ensures form-fit compatibility.; SDT5H100SB-13: Same package ensures form-fit compatibility.
Technology	Schottky	Schottky	Trench Schottky	Schottky / Trench Schottky — Both are Schottky rectifiers.; SDT5H100SB-13: Both are Schottky rectifiers.
Voltage	40V	40V	100V	40V / 100V — Identical reverse voltage rating.; SDT5H100SB-13: Higher voltage rating provides more design margin.
Current	3.0A	3.0A	5.0A	3.0A / 5.0A — Identical forward current rating.; SDT5H100SB-13: Higher current rating provides more design margin.
Forward Voltage	0.45V	0.50V	0.62V	0.50V / 0.62V — Slightly higher Vf may increase power loss.; SDT5H100SB-13: Significantly higher Vf will increase power loss and heat.
Surge Current	70A	100A	-	100A — Higher surge capability provides more robustness.

Application & sourcing insights

Questions & answers

The best alternative to B340LB-13-F is B340B-13-F. It has the same package, voltage, and current ratings, with only a slightly higher forward voltage.