BAT54SWFILMY
STMicroelectronics
Needs validationlow risk
An automotive-grade upgrade path from STMicroelectronics with higher voltage and current ratings.
Best Alternatives to BAT54SW
The BAT54SW is a popular dual series-connected Schottky barrier diode in a compact SOT-323 package. It is widely used for high-speed switching, reverse polarity protection, and signal clamping applications where low forward voltage and fast recovery are critical.
AI replacement insight
Package riskhigh
Incorrect diode configuration (e.g., single, common cathode) within the same SOT-323 package is the main risk.
Electrical risklow
Most BAT54SW variants have similar 30V/200mA ratings, but always verify Vf and capacitance from the datasheet.
Can it be replaced directly?
Yes, several manufacturers produce pin-compatible BAT54SW series Schottky diodes in a SOT-323 package, such as onsemi's BAT54SWT1G.
Best replacement path
Use another manufacturer's BAT54SW, such as the onsemi BAT54SWT1G, for a direct cross. For improved robustness, consider the STMicroelectronics BAT54SWFILMY, which is an automotive-grade upgrade.
Main risk
The primary risk is using a part with the wrong internal configuration. The target is a series array; using a single diode, common cathode, or common anode version will cause circuit failure.
Recommended alternatives
4Alternative comparison matrix
| Feature / factor | BAT54SW | BAT54SWFILMY | BAT54SW | BAT54SWT1G | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOT-323 | SOT-323 | SOT-323 | SOT-323 (SC-70) | SOT-323 / SOT-323 (SC-70) — Package matches target.; BAT54SW: Package matches target.; BAT54SWT1G: Package matches target.; LBAT54SWT1G: Package matches target. |
| Pinout | Series Array (Schottky) | Series | Series Array (Schottky) | 1 Pair Series | Series / Series Array (Schottky) / 1 Pair Series — Matches target's actual series configuration.; BAT54SW: Matches target's actual series configuration confirmed from datasheet.; BAT54SWT1G: Matches target's actual series configuration.; LBAT54SWT1G: Matches target's actual series configuration. |
| Voltage | 30V | 40V | 30V | 30V | 40V / 30V — Higher voltage rating provides more margin.; BAT54SW: Reverse voltage matches.; BAT54SWT1G: Reverse voltage matches.; LBAT54SWT1G: Reverse voltage matches. |
| Current | 200mA | 300mA | 200mA | 200mA | 300mA / 200mA — Higher current rating provides more margin.; BAT54SW: Forward current matches.; BAT54SWT1G: Forward current matches.; LBAT54SWT1G: Forward current matches. |
| Application | Commercial | AEC-Q101 | - | - | AEC-Q101 — Automotive qualification may be beneficial. |
Application & sourcing insights
Questions & answers
The best alternative is BAT54SWFILMY from STMicroelectronics. It is an automotive-grade upgrade with higher voltage (40V vs 30V) and current (300mA vs 200mA) ratings in the same SOT-323 package.