Is there a pin-compatible replacement for MBRA340T3G-FS?

Yes, parts like SS34A, SM340A, and SK34A are available in the same SMA (DO-214AC) package and are considered pin-compatible. However, their electrical characteristics, such as forward voltage (Vf), are not identical and require engineering review before substitution.

What risks should I check before replacing MBRA340T3G-FS?

Before replacing MBRA340T3G-FS, check the forward voltage (Vf) and reverse leakage current (Ir) of the candidate. A higher Vf will increase power loss and heat, potentially affecting efficiency and thermal management. Also, ensure the package is an exact match (SMA/DO-214AC) to avoid PCB layout issues.

MBRA340T3G-FS Alternatives, Datasheet & Cross Reference | FUXINSEMI

MBRA340T3G-FS is a 40V, 3A Schottky rectifier in a compact SMA package, valued for its low forward voltage. While no exact one-to-one replacement is confirmed, several form-fit compatible alternatives are available that match key ratings but may require an engineering review for performance differences.

AI replacement insight

Electrical riskmedium

Higher forward voltage and reverse leakage in most alternatives can impact system efficiency and thermal performance.

Package risklow

Several candidates use the same SMA package, ensuring physical compatibility. Functional alternates have different packages.

Can it be replaced directly?

No direct, fully equivalent replacement was found. However, several parts like SS34A are form-fit compatible and should be reviewed by an engineer for suitability in your application.

Best replacement path

Review form-fit candidates like SS34A or SM340A. They match the package and primary ratings, but require verification of performance impacts from slightly higher forward voltage.

Main risk

The primary risk is increased power dissipation and lower efficiency due to candidates having a higher forward voltage (Vf) than the target's 0.45V.

Recommended alternatives

A form-fit alternate with matching voltage and current, but review higher forward voltage and leakage.

View details

Alternative comparison matrix

Feature / factor	MBRA340T3G-FS	SS34A	SS54A	Compatibility / risk
Package	SMA/DO-214AC	SMA/DO-214AC	SMA/DO-214AC	SMA/DO-214AC — Package is physically compatible.; SS54A: Package is physically compatible.
Voltage	40V	40V	40V	40V — Voltage rating is identical.; SS54A: Voltage rating is identical.
Current	3A	3A	5A	3A / 5A — Current rating is identical.; SS54A: Higher current rating provides more margin.
Forward Voltage	0.45V	0.55V	0.55V	0.55V — Higher Vf may increase power loss.; SS54A: Higher Vf may increase power loss despite higher current rating.
Reverse Leakage	0.3mA	0.5mA	-	0.5mA — Higher leakage current.

Application & sourcing insights

Questions & answers

The best alternatives are parts like SS34A or SM340A, which match the SMA package, 40V voltage, and 3A current ratings. However, you must verify that their slightly higher forward voltage is acceptable for your application's efficiency requirements.