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Best Alternatives to MS2A40LWS

Package: SOD-323MSKSEMIDiodes - Rectifiers - SingleVoltage - DC Reverse (Vr) (Max): 40 VCurrent - Average Rectified (Io): 2 AForward Voltage (Vf) (Max) @ If: 0.42 V @ 1 AReverse Leakage Current (Ir) @ Vr: 80 µA @ 40 VPackage / Case: SOD-323

MS2A40LWS is a 40V, 2A Schottky diode in a compact SOD-323 package. Finding a direct replacement is challenging, as alternatives often come in different, larger packages that require a board redesign.

AI replacement insight

Package riskhigh

Candidates are in SMA/SMB/SMC packages, which are not compatible with the SOD-323 footprint.

Electrical risklow

Several candidates offer similar or better voltage and current ratings, but forward voltage (Vf) must be verified for the specific application.

Can it be replaced directly?

No direct, drop-in replacement for MS2A40LWS was found among the candidates. All options have a different physical package.

Best replacement path

Search for a new Schottky diode with Vr ≥ 40V, Io ≥ 2A in a SOD-323 package. The reviewed candidates require a board redesign.

Main risk

The primary risk is the package mismatch. The target is in a compact SOD-323 package, while all potential alternatives are in much larger SMA, SMB, or SMC packages, making them physically incompatible without a board redesign.

Recommended alternatives

4
STPS5L60S-FS package
STPS5L60S-FS

FUXINSEMI

Needs validationhigh risk

An electrically strong functional alternative with higher ratings, but in a different package (SMC) requiring a new layout.

View details

Alternative comparison matrix

Feature / factorMS2A40LWSSTPS5L60S-FSSTPS340USX34_R1_00001Compatibility / risk
PackageSOD-323DO-214AB, SMCSMBDO-214AC (SMA)DO-214AB, SMC / SMB / DO-214AC (SMA) / SMB (DO-214AA) — Not a drop-in replacement; requires board redesign.; STPS340U: Not a drop-in replacement; requires board redesign.; SX34_R1_00001: Not a drop-in replacement; requires board redesign.; UMW SS36B: Not a drop-in replacement; requires board redesign.
Voltage40V60V40V40V60V / 40V — Higher voltage rating provides more margin.; STPS340U: Matches target, but offers no additional design margin.; SX34_R1_00001: Matches target, but offers no additional design margin.; UMW SS36B: Higher voltage rating provides more margin.
Current2A5A3A3A5A / 3A — Significantly higher current rating.; STPS340U: Higher current rating.; SX34_R1_00001: Higher current rating.; UMW SS36B: Higher current rating.
Forward Voltage0.42V @ 1A0.52V @ 5A0.57V @ 3A0.5V0.52V @ 5A / 0.57V @ 3A / 0.5V / 0.75V @ 3A — Comparable forward voltage, good performance.; STPS340U: Higher forward voltage will increase power dissipation.; SX34_R1_00001: Slightly higher forward voltage.; UMW SS36B: Higher forward voltage will increase power dissipation.

Application & sourcing insights

Questions & answers

Among the reviewed parts, STPS5L60S-FS is a strong electrical alternative with better ratings, but it requires a board redesign due to its larger SMC package. The best path is to search for a 40V, 2A Schottky diode specifically in a SOD-323 package.