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BAT54AFILM

BAT54AFILM Schottky Diode, 40V 300mA, 5ns trr, SOT-23-3

MPNBAT54AFILM
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STMicroelectronics BAT54AFILM, Schottky diode, dual common anode, 40 V reverse, 300 mA average rectified, 5 ns trr, SOT-23-3, surface mount.

$0.4400Ref. price · indicative, final on quote
STMicroelectronics BAT54AFILM datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

BAT54AFILM specifications
ParameterValue
Diode typeSchottky
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 rectified (Io) (per diode)300mA (DC)
Operating temperature - junction-40°C~150°C
SpeedFast Recovery =< 500ns, > 200mA (Io)
PackageTape & Reel (TR); Cut Tape (CT)
CaseTO-236-3, SC-59, SOT-23-3
Diode configuration1 Pair Common Anode
Reverse recovery time5 ns

Product details

What this Schottky pair does on the board

Switching speed and recovery — the 5 ns edge

The 5 ns reverse recovery time (trr) is the headline spec for this part. In a boost converter or a gate-drive bootstrap circuit, that fast recovery means the diode stops conducting almost as soon as the voltage reverses, minimising the reverse-recovery charge that would otherwise spike the switching losses. For a 300 mA Schottky, 5 ns is tight — it keeps the efficiency curve clean up into the low-MHz switching range. At 100 mA forward current the forward voltage drop maxes at 900 mV — higher than a power Schottky, but expected for a small-signal part where the trade-off is speed over conduction loss. The 1 µA reverse leakage at 30 V is low enough that it won't upset a high-impedance sense node or a battery-powered rail.

SOT-23-3 is one of the most rework-friendly small-signal packages. Three pads, wide 0.95 mm pitch, no thermal pad underneath — a standard hot-air station at 300 °C will lift the part clean in under 10 seconds without cooking the board.

That means no last-time-buy pressure, no scramble for surplus stock.

Frequently asked questions

Is BAT54AFILM suitable for high-speed switching?

Yes. The 5 ns reverse recovery time qualifies it for fast-switching roles such as flyback clamping, polarity protection, and signal steering in circuits switching up into the low-MHz range.

What is the difference between BAT54AFILM and BAT54A?

Both are dual Schottky diodes in SOT-23-3 with the same 40 V / 300 mA / 5 ns ratings. The difference is the internal configuration: BAT54AFILM is a common-anode pair (cathodes on pins 1 and 3, shared anode on pin 2), while the base BAT54A is a single diode. The pinout and footprint are identical — the choice depends on whether the circuit needs two independent Schottkys or a common-anode pair.