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Best Alternatives to B340AG

Package: SMASHIKUESDiodes - Rectifiers - SingleReverse Voltage (VRRM): 40 VForward Current (IF(AV)): 3 AForward Voltage (VF) at 3A: 0.70 VPeak Forward Surge Current (8.3ms): 80 AOperating Junction Temperature: -55 to +125 °C

B340AG is a standard 40V, 3A Schottky diode in a surface-mount SMA package. Several alternatives exist with similar or upgraded performance, but engineers should verify forward voltage (Vf) and voltage margin for their specific application.

AI replacement insight

Electrical riskmedium

Using a 40V part without margin is risky. Higher Vf in some alternatives increases power loss.

Package risklow

SMA and DO-214AC packages are standard and mechanically compatible.

Sourcing risklow

This is a common diode type with many available cross-vendor alternatives.

Can it be replaced directly?

SS34G is a very close parametric match with a better forward voltage, but it lacks voltage safety margin and requires careful review of the application's peak voltage.

Best replacement path

Upgrade to SS56 SMA for improved voltage (60V) and current (5A) ratings, providing greater design margin.

Main risk

Electrical stress from insufficient voltage margin or increased power loss and heat from a higher forward voltage (Vf).

Recommended alternatives

4
SS56 SMA package
SS56 SMA

BORN

Needs validationlow risk

An upgrade with higher 60V/5A ratings and compatible SMA package, offering better performance margins.

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Alternative comparison matrix

Feature / factorB340AGSS56 SMASS34GSS34 SMA 50milCompatibility / risk
PackageSMASMA (DO-214AC)SMASMA (DO-214AC)SMA (DO-214AC) — Mechanically compatible.; SS34G: Identical package.; SS34 SMA 50mil: Mechanically compatible.; SS310SMA: Identical package.
Voltage40V60V40V40V60V / 40V / 100V — Provides higher voltage margin.; SS34G: Identical rating, no safety margin per ER-GLOBAL-005.; SS34 SMA 50mil: Identical rating, no safety margin.; SS310SMA: Significant voltage upgrade.
Current3A5A3A3A5A / 3A — Higher current handling capability.; SS34G: Identical rating.; SS34 SMA 50mil: Identical rating.; SS310SMA: Identical rating.
Forward Voltage0.70V @ 3A0.65V @ 5A0.55V0.55V0.65V @ 5A / 0.55V / 0.85V @ 3A — Likely lower Vf than target at 3A, which is better.; SS34G: Lower Vf improves efficiency.; SS34 SMA 50mil: Lower Vf improves efficiency.; SS310SMA: Higher Vf will increase power loss and heat.
Reverse Leakage0.5mA @ 40V1mA @ 60V--1mA @ 60V — Higher leakage current, may be a concern in sensitive circuits.
Temperature-55 to +125 °C--55°C to +125°C--55°C to +125°C — Identical operating range.

Application & sourcing insights

Questions & answers

The SS56 SMA is an excellent alternative, offering a direct upgrade to 60V and 5A in a compatible SMA package. This provides greater design margin for both voltage and current.