STMicroelectronics BAT54FILMY

Overview

BAT54FILMY from STMicroelectronics is an automotive-qualified 40 V, 300 mA Schottky barrier diode in SOT-23 package, featuring 7 pF typical capacitance, 5 ns reverse recovery time, and operation up to 150 °C junction temperature-used for high-speed clamping and polarity protection in automotive body control modules.

For engineers reviewing the BAT54FILMY datasheet, BAT54FILMY pinout, BAT54FILMY application, or BAT54FILMY equivalent, key selection criteria include low forward voltage (≤500 mV at 30 mA), AEC-Q101 qualification, PPAP capability, and thermal resistance of 500 °C/W in standard PCB layout.

Technical Context

This Schottky diode operates with negligible switching losses due to its metal–semiconductor junction, enabling fast transitions without minority-carrier storage delay. Its low 7 pF capacitance and 5 ns trr support RF detector and high-frequency rectifier functions up to ~100 MHz.

The device is rated for continuous forward current of 300 mA and repetitive peak reverse voltage of 40 V, with reverse leakage limited to 1 µA at 30 V/25 °C and 100 µA at 100 °C-critical for low-power automotive sensor interfaces requiring stable biasing over temperature.

Key Specifications

Pinout & Package

SOT-23-3L surface-mount package (3.04 mm × 1.75 mm × 1.40 mm) with gull-wing leads, RoHS-compliant and ECOPACK®2 certified. Thermal performance assumes JEDEC-standard epoxy PCB with specified copper pad layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky diode applications.

Compared with BAT54FILMY, NSS40201MR6T1G trades higher capacitance for lower leakage at low current, while VS-2EDH01-M3/84A sacrifices speed and qualification for legacy compatibility-making BAT54FILMY optimal for AEC-Q101-compliant, high-frequency automotive signal paths.

Availability

BAT54FILMY is available at Aetrix Electronics and suitable for automotive body electronics, USB interface protection, RF detector circuits, and PWM-driven solenoid control requiring stable component supply across extended temperature ranges.

Supply support for BAT54FILMY includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, MCU, power, and automotive-grade components.

BAT54FILMY belongs to the BAT54 automotive Schottky diode family, engineered specifically for AEC-Q101 compliance, PPAP readiness, and robust operation in harsh-temperature vehicle subsystems.

FAQ

Is BAT54FILMY pin-compatible with BAT54C or BAT54A?

No. BAT54FILMY is a single-diode SOT-23 configuration with Anode–Cathode–NC pinout. BAT54C (common cathode dual) and BAT54A (common anode dual) use different internal connections and pin assignments-interchange requires PCB redesign and functional validation.

What is the maximum allowable soldering temperature for BAT54FILMY?

The maximum peak soldering temperature is 260 °C for 10 seconds, per J-STD-020. Reflow profiles must comply with ST's SOT-23 moisture sensitivity level (MSL) 1 rating-no baking required prior to assembly.

Does BAT54FILMY support bidirectional signal routing?

No. As a unidirectional Schottky diode, it conducts only from anode to cathode. It cannot pass signals in reverse direction or function as a bidirectional TVS-use dedicated bidirectional ESD arrays for such applications.

Can BAT54FILMY replace a 1N5819 in automotive designs?

Only with qualification. While both are 40 V Schottky diodes, BAT54FILMY is AEC-Q101 qualified, PPAP-capable, and characterized to 150 °C; 1N5819 lacks automotive qualification and has higher V_F (≥600 mV at 100 mA), making it unsuitable for production automotive use without revalidation.