Is there a pin-compatible replacement for BAT54CLT3G?

Yes, parts like MMBD4148CC and LBAV74LT1G are available in the same SOT-23 package with a common cathode configuration. However, they are not functionally identical due to being standard diodes, not Schottky, which affects forward voltage.

What risks should I check before replacing BAT54CLT3G?

The main risk is the higher forward voltage (Vf) of non-Schottky alternatives. This can reduce efficiency in power circuits or alter signal levels in logic applications. Always verify the impact of a higher Vf on your specific circuit design.

BAT54CLT3G Alternatives, Datasheet & Cross Reference | onsemi

The onsemi BAT54CLT3G is a popular common cathode Schottky diode in a SOT-23 package, valued for its low forward voltage. Finding a direct replacement requires matching not just the package and pinout, but also the Schottky technology to ensure functional compatibility.

AI replacement insight

Electrical riskhigh

Forward voltage (Vf) difference between Schottky and standard diodes is critical.

Package risklow

SOT-23 is a common package, and candidates with matching pinouts are available.

Can it be replaced directly?

No direct drop-in Schottky replacement was found. Alternatives like MMBD4148CC have the same package and pinout but are standard diodes with higher forward voltage, requiring circuit validation.

Best replacement path

Search for a common cathode Schottky diode in a SOT-23 package with Vr >= 30V. If not available, a standard diode like MMBD4148CC may work if the higher forward voltage is acceptable for the application.

Main risk

The primary risk is the forward voltage (Vf) mismatch. The target is a low-Vf Schottky diode, while many alternatives are standard diodes with a significantly higher Vf, which can impact circuit efficiency and voltage levels.

Recommended alternatives

A functional alternative in the same package and configuration, but with a higher forward voltage.

View details

Alternative comparison matrix

Feature / factor	BAT54CLT3G	MMBD4148CC	LBAV74LT1G	Compatibility / risk
Package	SOT-23 (TO-236)	SOT-23	SOT-23	SOT-23 — Package matches, enabling form-fit compatibility.; LBAV74LT1G: Package matches, enabling form-fit compatibility.
Polarity Or Type	1 Pair Common Cathode	1 Pair Common Cathode	Common Cathode (from datasheet)	1 Pair Common Cathode / Common Cathode (from datasheet) — Pin configuration matches the target.; LBAV74LT1G: Configuration matches based on datasheet, but was missing from specs.
Voltage V	30V	100V	50V	100V / 50V — Higher voltage rating provides more design margin.; LBAV74LT1G: Higher voltage rating provides more design margin.
Diode Technology	Schottky	Standard Fast Switching	Standard Switching	Standard Fast Switching / Standard Switching — Different technology. Higher forward voltage (Vf) than target's Schottky. Review required.; LBAV74LT1G: Different technology. Higher forward voltage (Vf) than target's Schottky. Review required.

Application & sourcing insights

Questions & answers

No direct drop-in replacement was identified. The best functional alternatives, like MMBD4148CC, have the same package and pin configuration but use standard diode technology, resulting in a higher forward voltage that requires engineering review.