Is there a pin-compatible replacement for BAS40WS?

Several candidates like LBAT40HT1G and MS2A40LWS use the same SOD-323 package and are likely pin-compatible. Since SOD-323 is a standard 2-pin package, physical replacement is straightforward, but all electrical parameters must be verified by an engineer.

What risks should I check before replacing BAS40WS?

When replacing BAS40WS, check these key risks: 1) Diode Type: Ensure the replacement is a Schottky diode for low forward voltage. 2) Reverse Current (Ir): Some alternatives have much higher leakage. 3) Junction Capacitance (Cj): For high-frequency use, high capacitance can degrade signal integrity.

BAS40WS Alternatives, Datasheet & Cross Reference | TWGMC

Find and compare alternatives for the BAS40WS, a 40V, 0.2A Schottky diode in a SOD-323 package. This guide analyzes key parametric differences to help you select a suitable replacement for your application.

AI replacement insight

Electrical riskhigh

Using a non-Schottky diode or one with high leakage/capacitance can cause circuit malfunction.

Package risklow

Multiple candidates exist in the same SOD-323 package, making physical replacement straightforward.

Can it be replaced directly?

There is no guaranteed drop-in replacement. However, LBAT40HT1G is a strong candidate in the same SOD-323 package that matches the Schottky diode type, voltage, and has a higher current rating. Engineering validation is required.

Best replacement path

LBAT40HT1G is the most promising alternative, matching key parameters with only a minor increase in reverse leakage. It should be evaluated first.

Main risk

The primary risk is substituting with a part that has a different diode type (non-Schottky), higher forward voltage, or significantly worse secondary parameters like reverse leakage and junction capacitance.

Recommended alternatives

A strong Schottky diode alternative in the same package with a higher current rating.

View details

Alternative comparison matrix

Feature / factor	BAS40WS	LBAT40HT1G	MS2A40LWS	Compatibility / risk
Package	SOD-323	SOD-323	SOD-323	SOD-323 — Form and fit match.; MS2A40LWS: Form and fit match.
Diode Type	Schottky	Schottky	Schottky	Schottky — Functional type matches.; MS2A40LWS: Functional type matches.
Voltage	40V	40V	40V	40V — Voltage rating is identical.; MS2A40LWS: Voltage rating is identical.
Current	0.2A	0.35A	2.0A	0.35A / 2.0A — Higher current rating provides more margin.; MS2A40LWS: Significantly higher current rating.
Forward Voltage	0.38V - 1.0V	0.6V @ 0.2A	-	0.6V @ 0.2A — Vf is within target's acceptable range.
Reverse Current	200nA @ 40V	1µA @ 25V	80µA @ 40V	1µA @ 25V / 80µA @ 40V — Reverse leakage is higher than target.; MS2A40LWS: Reverse leakage is significantly higher.

Application & sourcing insights

Questions & answers

The best alternative appears to be LBAT40HT1G. It is a Schottky diode with the same voltage rating, a higher current rating, and a similar package. You must verify its slightly higher reverse leakage is acceptable for your design.