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Best Alternatives to MBR140SFT1G

Package: SOD-123FonsemiDiodes - Rectifiers - SinglePackage: Tape & Reel (TR); Cut Tape (CT); Digi-Reel®Product Status: ActiveVoltage - DC Reverse (Vr) (Max): 40 VCurrent - Average Rectified (Io): 1AVoltage - Forward (Vf) (Max) @ If: 550 mV @ 1 A

MBR140SFT1G is a 40V, 1A Schottky rectifier from onsemi in a compact SOD-123FL package, ideal for high-frequency rectification and protection circuits.

AI replacement insight

Electrical risklow

Low if Vf is matched or lower. Medium for parts with higher Vf.

Package risklow

Many alternatives use the same SOD-123FL package.

Sourcing riskmedium

Risk increases when selecting alternatives from less-established manufacturers.

Can it be replaced directly?

SS34FA is a strong candidate for replacing MBR140SFT1G, offering higher current in the same package with better forward voltage.

Best replacement path

Upgrade to SS34FA for higher 3A current capability from the same manufacturer, onsemi.

Main risk

The primary risk when substituting is an increased forward voltage (Vf), which can lead to higher power loss and heat.

Recommended alternatives

3
SS34FA package
SS34FA

onsemi

Needs validationlow risk

An excellent upgrade from the same manufacturer with a higher 3A current rating and lower forward voltage.

View details

Alternative comparison matrix

Feature / factorMBR140SFT1GSS34FADSL34MBR1H100SFT3GCompatibility / risk
PackageSOD-123FLSOD-123FLSOD-123FLSOD-123FLSOD-123FL — Matches target package.; DSL34: Matches target package.; MBR1H100SFT3G: Matches target package.
Voltage40V40V40V100V40V / 100V — Reverse voltage matches target.; DSL34: Reverse voltage matches target.; MBR1H100SFT3G: Higher reverse voltage provides more design margin.
Current1.0A3.0A3.0A1.0A3.0A / 1.0A — Higher current rating provides more design margin.; DSL34: Higher current rating provides more design margin.; MBR1H100SFT3G: Forward current matches target.
Forward Voltage0.55V @ 1A0.50V @ 3A0.45V0.76V @ 1A0.50V @ 3A / 0.45V / 0.76V @ 1A — Lower forward voltage at higher current implies less power loss.; DSL34: Lower forward voltage reduces power loss.; MBR1H100SFT3G: Higher forward voltage will increase power dissipation.
Temperature-55°C to 125°C-55°C to +125°C--55°C to +175°C-55°C to +125°C / -55°C to +175°C — Operating temperature range matches.; MBR1H100SFT3G: Wider operating temperature range.
Manufactureronsemi-R+O-R+O — Different manufacturer; requires qualification.

Application & sourcing insights

Questions & answers

SS34FA from onsemi is an excellent upgrade, offering a 3A current rating in the same package with a lower forward voltage for better efficiency.