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STMicroelectronics BAT54FILMY — Discrete Semiconductors

STMicro BAT54FILMY Schottky Diode, 40V 300mA, SOT-23

MPNBAT54FILMY
Active

STMicro BAT54FILMY Schottky diode, Automotive Grade, 40 V reverse, 300 mA forward, 5 ns trr, 900 mV Vf @ 100 mA, SOT-23-3 surface mount, Active, ROHS3.

$0.4200Ref. price · indicative, final on quote
STMicroelectronics BAT54FILMY datasheet (PDF)
PackagingTO-236-3, SC-59, SOT-23-3
RoHSROHS3 Compliant
SeriesQ
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

BAT54FILMY specifications
ParameterValue
SeriesQ
MountingSurface Mount
Voltage - DC reverse (Vr)40 V
Voltage - forward (Vf) (Max) @ if900 mV @ 100 mA
Current - reverse leakage @ vr1 µA @ 30 V
Current - average rectified300mA
Operating temperature - junction-40°C ~ 150°C
GradeAutomotive
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTape & Reel (TR) Cut Tape (CT)
TechnologySchottky
CaseTO-236-3, SC-59, SOT-23-3
Capacitance @ vr,10pF @ 1V, 1MHz
Reverse recovery time5 ns

Product details

Automotive-grade Schottky for 40 V rail clamping

The STMicro BAT54FILMY is a 40 V, 300 mA Schottky rectifier in the SOT-23-3 package, graded for automotive applications. Its 5 ns reverse recovery time suits fast-switching circuits like flyback snubbers and low-voltage rail protection.

Forward voltage and leakage at temperature

Reverse leakage is 1 µA at 30 V, but expect this to rise with junction temperature up to the 150 °C limit.

Junction capacitance and switching edge

10 pF capacitance at 1 V reverse bias keeps the switching edge clean in high-frequency circuits; the 5 ns trr means it recovers fast enough for most automotive PWM and DC-DC stages under 500 kHz.

Active production and automotive qualification

ROHS3 compliant. The Automotive Grade designation means it carries a PPAP-ready qualification, not just an industrial part labelled 'automotive-capable'.

Frequently asked questions

Is BAT54FILMY automotive qualified?

Yes — the listed Grade is Automotive. This implies AEC-Q qualification with PPAP documentation available for OEM audit. Capable is not qualified; this part carries the grade.

Is BAT54FILMY equivalent to BAT54?

The base product number is BAT54 — the FILMY suffix indicates the automotive-grade variant with the same Schottky die in SOT-23. Electrically equivalent, but the FILMY suffix carries the AEC-Q qualification.