Is there a pin-compatible replacement for BAT54WS L9?

Yes, BAT54WS from other manufacturers are considered pin-compatible. Other candidates like LBAT40HT1G and BAT54H use the same SOD-323 package and are form-fit compatible, but electrical verification is always recommended.

What risks should I check before replacing BAT54WS L9?

Key risks include differences in forward voltage (Vf) at your operating current, reverse leakage current (Ir) which affects power consumption, and diode capacitance which can impact high-frequency circuit performance.

BAT54WS L9 Alternatives, Datasheet & Cross Reference | Jiangsu Changjing Electronics Technology Co., Ltd.

The BAT54WS L9 is a popular Schottky barrier diode in a compact SOD-323 package, used for fast switching and rectification in low-power applications. This page provides a review of potential substitutes and their compatibility.

AI replacement insight

Electrical riskmedium

Must check Vf, Ir, and capacitance. Some alternatives have much higher reverse leakage.

Package risklow

All top candidates use the same SOD-323 package, ensuring form-fit compatibility.

Sourcing risklow

This is a common diode type with many alternatives from various manufacturers.

Can it be replaced directly?

Yes, BAT54WS from manufacturers like FUXINSEMI or TWGMC is a direct replacement.

Best replacement path

Direct cross to a BAT54WS from another vendor, or upgrade to LBAT40HT1G for improved ratings.

Main risk

The main risk when choosing an alternative is an increase in reverse leakage current, which can be an issue in power-sensitive designs.

Recommended alternatives

A cross-vendor equivalent with nearly identical key parameters, offering a direct replacement path.

View details

Alternative comparison matrix

Feature / factor	BAT54WS L9	BAT54WS	LBAT40HT1G	BAT54H	Compatibility / risk
Package	SOD-323	SOD-323	SOD-323	SOD-323	SOD-323 — Package matches, enabling form-fit compatibility.; LBAT40HT1G: Package matches, enabling form-fit compatibility.; BAT54H: Package matches, enabling form-fit compatibility.
Voltage	21V	21V	40V	30V	21V / 40V / 30V — Reverse voltage rating is identical.; LBAT40HT1G: Higher reverse voltage provides more design margin.; BAT54H: Higher reverse voltage provides more margin.
Current	100mA	100mA	350mA	200mA	100mA / 350mA / 200mA — Forward current rating is identical.; LBAT40HT1G: Higher forward current rating.; BAT54H: Higher forward current rating.
Vf	1V @ 100mA	1V @ 100mA	600mV @ 200mA	-	1V @ 100mA / 600mV @ 200mA — Forward voltage is identical.; LBAT40HT1G: Lower forward voltage implies better efficiency.
Ir	2µA @ 25V	2µA @ 25V	1µA @ 25V	up to 50µA @ 30V	2µA @ 25V / 1µA @ 25V / up to 50µA @ 30V — Reverse leakage is identical.; LBAT40HT1G: Lower reverse leakage improves efficiency.; BAT54H: Reverse leakage is significantly higher.

Application & sourcing insights

Questions & answers

The best alternative is typically another BAT54WS from a different manufacturer, as it offers nearly identical specifications. For an upgrade, LBAT40HT1G provides higher voltage/current ratings with improved performance.