Is there a pin-compatible replacement for B240A?

SS54 is a potential pin-compatible replacement as it shares the same SMA package and has similar key parameters. However, since its voltage rating is identical to the B240A, it's critical to review your circuit's requirements before considering it a drop-in replacement. We recommend FAE review.

What risks should I check before replacing B240A?

When replacing B240A, first confirm the candidate is a Schottky diode in an SMA (DO-214AC) package. Then, verify the reverse voltage (Vr) is at least 40V and forward current (If) is at least 2A. Finally, check the forward voltage (Vf) as a higher value will increase power loss and heat.

B240A Alternatives, Datasheet & Cross Reference | Microdiode Semiconductor (Shenzhen) Co., Ltd.

B240A is a 40V, 2A Schottky rectifier in a common SMA package. When seeking replacements, focus on matching the Schottky type, SMA (DO-214AC) package, and ensuring voltage/current ratings are equal or greater.

AI replacement insight

Package riskmedium

SMA (DO-214AC) vs SMC (DO-214AB) is a common point of confusion and requires verification.

Electrical riskmedium

Forward voltage (Vf) affects efficiency, and reverse voltage (Vr) must have sufficient margin.

Sourcing risklow

This is a common diode type with many manufacturers and available stock.

Can it be replaced directly?

No drop-in replacement is confirmed without datasheet review. SS54 is a very strong candidate, matching package, current, and forward voltage, but has an identical voltage rating which may lack design margin.

Best replacement path

SS54 offers the closest electrical match but requires verifying the 40V rating is sufficient. For more voltage margin, consider SS510, but check for increased power loss due to its higher forward voltage.

Main risk

The main risks are package mismatches (e.g., SMA vs. SMC) and functional type mismatches (Schottky vs. Standard). For electrical matches, check forward voltage (Vf) for efficiency impacts and ensure voltage rating (Vr) has sufficient margin for the application.

Recommended alternatives

A strong alternative in the same package with higher current, but requires review of the 40V voltage rating.

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Alternative comparison matrix

Feature / factor	B240A	SS54	SS510	Compatibility / risk
Package	DO-214AC/SMA	DO-214AC (SMA)	-	SMA (DO-214AC) — Package appears to be a direct match.
Voltage	40V	40V	-	100V — Higher voltage rating provides significant margin.
Current	2A	5A	-	5A — Higher current capability.
Forward Voltage	~0.55V	~0.55V	-	~0.85V — Higher forward voltage will increase power loss and heat.

Application & sourcing insights

Questions & answers

SS54 is often the best alternative, offering a very similar electrical profile in the same package. However, you must verify that the 40V rating is sufficient for your design. For a higher voltage margin, SS510 is a good option, but its higher forward voltage should be evaluated.