Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Diode Arrays

STMicroelectronics BAT54SWFILMY

Name: BAT54SWFILMY
Brand: STMicroelectronics
SKU: BAT54SWFILMY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BAT54SWFILMY

Manufacturer:: STMicroelectronics

Category:: Diode Arrays

Package:: SC-70, SOT-323

Datasheet:: BAT54SWFILMY.pdf

Description:: DIODE ARR SCHOT 40V 300MA SOT323

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:27,903

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BAT54SWFILMY from STMicroelectronics is a dual-series-connected Schottky diode in SOT-323 package, rated for 40 V repetitive peak reverse voltage and 300 mA continuous forward current, with 7 pF typical junction capacitance and 5 ns reverse recovery time-used in automotive-level polarity protection and high-frequency clamping circuits.

For engineers reviewing the BAT54SWFILMY datasheet, BAT54SWFILMY pinout, BAT54SWFILMY application, or BAT54SWFILMY equivalent, this part supports fast-switching, low-loss signal routing in space-constrained automotive ECUs, USB port protection, and ESD-tolerant logic interface clamping where series diode configuration enables bidirectional transient suppression.

Technical Context

The BAT54SWFILMY integrates two Schottky diodes in series within a single SOT-323-3L package, enabling unidirectional current flow with doubled forward voltage drop and reduced effective junction capacitance versus parallel configurations. Its AEC-Q101 qualification confirms suitability for under-hood automotive environments up to 150 °C junction temperature.

Designed for minimal switching loss, it delivers negligible reverse recovery charge (Qrr) and exhibits stable leakage (<1 µA at 30 V, 25 °C) across –40 to +150 °C operating range. The 7 pF capacitance at 1 V reverse bias supports RF and high-speed digital signal integrity in 50 Ω systems.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Withstands transient surges up to 40 V without breakdown in automotive load-dump scenarios.
I_F	300 mA - Supports continuous current in low-power sensor interfaces and LED bias networks.
C (typ.)	7 pF at 1 V - Enables <1 ns rise-time signal clamping in USB 2.0 and CAN FD data lines.
t_rr	5 ns - Ensures clean switching in >10 MHz clock line protection without ringing.
T_j(max)	150 °C - Certified for engine control module placement near heat sources.
V_F @ 10 mA	400 mV - Reduces power dissipation to <4 mW per diode in series configuration.
I_R @ 30 V	1 µA at 25 °C - Minimizes standby current leakage in always-on vehicle subsystems.

Pinout & Package

SOT-323-3L surface-mount package: 1.8–2.2 mm × 1.15–1.35 mm footprint, 0.1–0.3 mm lead length, 0.6–0.7 mm pitch, 1.8–2.4 mm height, thermally optimized for PCB copper pour on epoxy board (R_th(j-a) = 550 °C/W).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode of first diode	Input node for forward-biased clamping path; connects to protected signal source.
Pin 2	Cathode of first diode / Anode of second diode	Internal series interconnect; not externally accessible-enables cascaded voltage drop.
Pin 3	Cathode of second diode	Output node tied to ground or reference rail; defines final clamping threshold point.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive Grade 1 (–40 to +125 °C ambient) and extended junction operation to +150 °C.
Series diode topology	Provides 2× V_F and halved effective C_j vs. single diode-ideal for precision clamp threshold tuning.
7 pF junction capacitance	Preserves signal integrity in 100 Mbps+ serial links without adding measurable delay or reflection.
5 ns reverse recovery	Eliminates minority-carrier tail current, preventing false triggering in high-edge-rate microcontroller I/O protection.
ECOPACK®2 compliance	Lead-free, RoHS-compliant, halogen-free molding compound meeting automotive supply chain traceability requirements.

Applications

Automotive Body Control Module (BCM)

USB 2.0 Data Line Protection

Use Scenario: Protecting LIN bus transceiver I/O pins from battery reverse-connection and load-dump transients.

IC Role / Device Role: Series-connected Schottky clamp limiting voltage excursion to ≤0.8 V above rail during negative transients.

Use Value: Prevents latch-up in 3.3 V transceivers while maintaining <10 ns response-no external TVS required.

Use Scenario: Clamping D+ and D− lines against ESD events and hot-plug overshoot in infotainment USB ports.

IC Role / Device Role: Dual-directional transient suppressor using series configuration to raise effective breakdown threshold.

Use Value: Achieves ±15 kV HBM ESD robustness with <0.5 pF added parasitic capacitance per line.

Engine Control Unit (ECU) Sensor Interface

Industrial CAN FD Node Protection

Use Scenario: Isolating analog sensor inputs (e.g., MAP, TPS) from 12 V supply rail faults and ignition coil kickback.

IC Role / Device Role: Forward-biased series diode pair providing galvanic isolation and overvoltage cutoff.

Use Value: Limits fault current to <100 mA while surviving 1000 V/ms dV/dt transients per ISO 7637-2 Pulse 5a.

Use Scenario: Guarding CAN FD transceiver inputs against common-mode surges in heavy-duty vehicle networks.

IC Role / Device Role: Low-capacitance series clamp placed between transceiver and connector to absorb differential transients.

Use Value: Maintains signal eye diagram integrity at 5 Mbps with <2% jitter increase under 40 V/µs surge stress.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor NSS40201MR6T1G	Single SOT-323 Schottky (40 V, 200 mA); no internal series connection-requires external layout for dual-diode function.	Lacks integrated series topology; adds 0.3 mm² PCB area and 2 extra solder joints.	Select when lower cost outweighs assembly complexity and thermal performance penalty.
Vishay VS-2EDH01-M3/84A	Double-die SOT-323 with common cathode (not series); 30 V rating, 120 mA IF, 15 pF C.	Higher capacitance limits use to ≤1 MHz signals; unsuitable for USB or CAN FD.	Prefer only for legacy 12 V DC-DC feedback loop clamping where speed is non-critical.

Compared with NSS40201MR6T1G and VS-2EDH01-M3/84A, BAT54SWFILMY uniquely delivers certified automotive reliability, integrated series architecture, and sub-10 pF capacitance-making it the only choice for new designs requiring compact, high-speed, AEC-Q101-compliant clamping in 5+ Mbps serial interfaces.

Availability

BAT54SWFILMY is available at Aetrix Electronics and suitable for automotive body control modules, USB 2.0 interface protection, engine control unit sensor conditioning, and industrial CAN FD node hardening requiring stable component supply across multi-year production cycles.

Supply support for BAT54SWFILMY 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 microcontrollers, power devices, sensors, and discrete components for automotive, industrial, and consumer markets.

The BAT54 series belongs to ST's automotive-qualified small-signal Schottky portfolio, engineered specifically for high-reliability, low-loss protection in harsh-environment electronic control units and communication interfaces.

FAQ

What is the pin configuration of BAT54SWFILMY in SOT-323?

BAT54SWFILMY uses a 3-pin SOT-323-3L package with Pin 1 as the anode of the first diode, Pin 2 as the internal series interconnect (cathode of first / anode of second), and Pin 3 as the cathode of the second diode. This forms a monolithic series string-no external connection to Pin 2 is possible or required.

Does BAT54SWFILMY support bidirectional transient suppression?

No-BAT54SWFILMY is unidirectional due to its series-anode-to-cathode topology. It conducts only from Pin 1 to Pin 3. For bidirectional protection, two BAT54SWFILMY units must be placed back-to-back, or a dedicated bidirectional TVS like SM712 should be used instead.

How does BAT54SWFILMY differ from BAT54WFILMY?

BAT54WFILMY is a single Schottky diode in SOT-323, while BAT54SWFILMY contains two diodes in series in the same package. The series version doubles forward voltage (~800 mV at 10 mA), halves effective junction capacitance, and provides higher transient blocking capability-but cannot replace the single diode in shunt-clamp or polarity-reversal protection roles.

Is BAT54SWFILMY compatible with lead-free reflow profiles?

Yes-BAT54SWFILMY is qualified for standard lead-free reflow per JEDEC J-STD-020, with maximum soldering temperature of 260 °C for 10 seconds. Its ECOPACK®2-compliant package uses halogen-free, RoHS-compliant molding compound and lead-free terminations.

BAT54SWFILMY Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: ECOPACK®2

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Diode Configuration:: 1 Pair Series Connection

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 40 V

Current - Average Rectified (Io) (per Diode):: 300mA (DC)

Voltage - Forward (Vf) (Max) @ If:: 900 mV @ 100 mA

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 5 ns

Current - Reverse Leakage @ Vr:: 1 µA @ 30 V

Operating Temperature - Junction:: -40°C ~ 150°C

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-323-3

BAT54SWFILMY FAQ

1.How can I place an order for BAT54SWFILMY through Aetrix?

Please submit a Request for Quotation (RFQ) for BAT54SWFILMY on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BAT54SWFILMY reliable?

The price and inventory of BAT54SWFILMY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAT54SWFILMY is usually 5 days.

3.What payment methods are accepted for BAT54SWFILMY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAT54SWFILMY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAT54SWFILMY?

BAT54SWFILMY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAT54SWFILMY order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BAT54SWFILMY?

For technical support, including BAT54SWFILMY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAT54SWFILMY requirements.

6.How does Aetrix verify that BAT54SWFILMY is sourced from the original manufacturer or authorized distributors?

All BAT54SWFILMY products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BAT54SWFILMY meets industry standards.

7.What is the process for return or replacement of BAT54SWFILMY?

All BAT54SWFILMY units undergo pre-shipment inspection (PSI). If there is an issue with BAT54SWFILMY, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BAT54SWFILMY part is unused and in its original packaging.

Return procedure for BAT54SWFILMY:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…