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STMicroelectronics BAT54WFILMY
- Part No.:
- BAT54WFILMY
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BAT54WFILMY.pdf
- Description:
- DIODE SCHOTTKY 40V 300MA SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:21,406
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Product details
Overview
BAT54WFILMY from STMicroelectronics is an automotive-qualified single Schottky diode in SOT-323 package, rated for 40 V repetitive peak reverse voltage (VRRM), 300 mA continuous forward current (IF), and exhibiting 7 pF typical junction capacitance (C) and 5 ns typical reverse recovery time (trr). It serves as a high-speed polarity protection or signal clamping device in low-voltage DC/DC converter feedback paths and automotive body control modules.
For engineers reviewing the BAT54WFILMY datasheet, BAT54WFILMY pinout, BAT54WFILMY application, or BAT54WFILMY equivalent, key selection criteria include its AEC-Q101 qualification, negligible switching losses, low forward voltage drop (≤500 mV at 30 mA), and thermal robustness up to 150 °C junction temperature - critical for under-hood power management and CAN/LIN bus interface protection.
Technical Context
The BAT54WFILMY implements a planar Schottky barrier structure optimized for fast switching with minimal stored charge, enabling operation in high-frequency (>1 MHz) rectification and clamping circuits. Its low 7 pF capacitance and 5 ns trr support clean signal integrity in 12 V automotive data lines.
Thermal design relies on its SOT-323 package with 550 °C/W junction-to-ambient thermal resistance on standard epoxy PCBs, and it operates across –40 °C to +150 °C ambient, meeting PPAP requirements for automotive production systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - supports 12 V automotive system transients including load dump spikes up to ISO 7637-2 Pulse 5a. |
| IF | 300 mA - sufficient for biasing, level shifting, and low-power signal path protection without derating at 85 °C. |
| C (typ.) | 7 pF - enables minimal capacitive loading on high-speed digital or analog signal lines (e.g., LIN bus). |
| trr (typ.) | 5 ns - ensures clean edge transitions and avoids shoot-through in synchronous buck converter freewheeling paths. |
| VF @ 30 mA | 500 mV - reduces conduction loss and self-heating in always-on protection circuits like ECU power rail clamps. |
| Tj(max) | 150 °C - allows placement near heat sources (e.g., motor drivers) without thermal shutdown in engine compartment applications. |
| IR @ 30 V, 100 °C | 100 µA - maintains low leakage in battery-sensitive sleep-mode circuits such as door module wake-up detection. |
Pinout & Package
The BAT54WFILMY is housed in a 3-pin SOT-323 (SC-70) surface-mount package with gull-wing leads, measuring 2.0 × 1.25 × 0.9 mm (L × W × H), and weighs 6 mg. It features a single-diode configuration with anode and cathode terminals plus case (non-connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Forward current entry point; connects to higher-potential node (e.g., input rail or signal source). |
| 2 | Cathode | Forward current exit point; ties to lower-potential node (e.g., ground or return path) for clamping or rectification. |
| 3 | Case / Heat Slug | Non-electrical thermal pad; provides mechanical stability and minor thermal relief via PCB copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test conditions including temperature cycling, HTRB, and ESD-HBM ≥2 kV - required for Tier-1 BOM inclusion. |
| Low VF (≤500 mV @ 30 mA) | Minimizes forward conduction loss in always-on protection circuits, extending battery life in vehicle keep-alive functions. |
| 7 pF junction capacitance | Preserves signal rise/fall times in 1–10 MHz data lines (e.g., LIN, SENT), avoiding timing skew or false triggering. |
| 5 ns reverse recovery time | Eliminates minority-carrier tail current, preventing cross-conduction in high-side switch snubber networks. |
| ECOPACK®2 compliance | Lead-free, RoHS-compliant construction with halogen-free molding compound - meets global automotive environmental mandates. |
Applications
| Automotive Body Control Module (BCM) | 12 V DC/DC Converter Feedback Path |
|---|---|
Use Scenario: Reverse polarity and load-dump transient protection for microcontroller I/O pins and sensor interfaces in door latch and mirror control units. IC Role / Device Role: Unidirectional clamping diode placed between supply rail and protected node to shunt overvoltage events. Use Value: Prevents latch-up and permanent damage during jump-start or alternator regulation faults while maintaining <1 µA leakage in sleep mode. | Use Scenario: Voltage sensing node protection in synchronous buck converters powering ADAS camera modules. IC Role / Device Role: Fast-switching clamp limiting feedback divider swing during output short-circuit or startup overshoot. Use Value: Ensures stable regulation by preventing op-amp saturation and preserving loop response time due to 5 ns trr and low C. |
| LIN Bus Interface Protection | Engine Control Unit (ECU) Power Rail Clamp |
Use Scenario: ESD and line-transient suppression on LIN physical layer transceivers operating at 19.2 kbps. IC Role / Device Role: Low-capacitance bidirectional clamp (anode-to-rail, cathode-to-ground) guarding transceiver pins. Use Value: Maintains signal integrity with ≤7 pF loading and passes ISO 10605 ±8 kV contact discharge without degradation. | Use Scenario: Overvoltage clamping on 5 V or 3.3 V regulated rails supplying MCU cores and flash memory in engine management systems. IC Role / Device Role: Low-VF Schottky placed between rail and ground to absorb transient energy during ignition coil switching. Use Value: Limits rail excursion to <5.5 V during 100 V/50 ms load dump pulses while dissipating <100 mW peak power. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor NSSR0230P5T5G | Same SOT-323 package, 30 V VRRM, 200 mA IF, 12 pF C, 10 ns trr | Lower voltage rating and slower switching limit use to non-load-dump 5 V systems only | Select when cost sensitivity outweighs 40 V margin and 5 ns speed requirement |
| Vishay VS-2EDH01-M3/84A | SOT-23 package, 40 V VRRM, 300 mA IF, but 10 pF C and 8 ns trr; not AEC-Q101 qualified | Lacks automotive qualification and has higher capacitance - unsuitable for LIN or high-speed feedback paths | Acceptable for industrial-grade 12 V supplies where PPAP and ESD immunity are not mandated |
Compared with NSSR0230P5T5G and VS-2EDH01-M3/84A, BAT54WFILMY uniquely combines AEC-Q101 qualification, 40 V rating, 5 ns trr, and 7 pF capacitance - making it the only option qualified for safety-critical automotive signal and power rail protection where both speed and reliability are mandatory.
Availability
BAT54WFILMY is available at Aetrix Electronics and suitable for automotive body control modules, 12 V DC/DC converter feedback protection, and LIN bus interface designs requiring stable component supply and full AEC-Q101 traceability.
Supply support for BAT54WFILMY 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, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.
The BAT54 series belongs to ST's automotive-qualified discrete portfolio, engineered specifically for robust, high-reliability signal conditioning and power rail protection in harsh-temperature vehicle environments.
FAQ
Is BAT54WFILMY pin-compatible with BAT54FILMY?
No. BAT54WFILMY uses the SOT-323 package (2.0 × 1.25 mm), while BAT54FILMY uses SOT-23 (3.04 × 1.75 mm). Their footprints, thermal resistance (550 vs. 500 °C/W), and mechanical mounting are incompatible - board redesign is required for substitution.
What is the maximum surge current rating for BAT54WFILMY?
The BAT54WFILMY is rated for 1 A non-repetitive forward surge current (IFSM) at tp = 10 ms (sinusoidal half-cycle), per Table 2 of the official datasheet. This supports brief load-dump or cranking-event energy absorption when used with appropriate series impedance.
Does BAT54WFILMY support reflow soldering per JEDEC J-STD-020?
Yes. The device is qualified for lead-free reflow with a maximum soldering temperature of 260 °C (per Table 2), compliant with JEDEC J-STD-020D Level 1 moisture sensitivity, and compatible with standard SnAgCu profiles using peak temperatures ≤260 °C and time above liquidus ≤60 seconds.
Can BAT54WFILMY be used in bidirectional ESD protection configurations?
No. As a single unidirectional Schottky diode, BAT54WFILMY conducts only from anode to cathode. For bidirectional ESD protection (e.g., on LIN or USB lines), a dual-diode array like BAT54CW or dedicated TVS such as SM712 is required.
BAT54WFILMY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Q
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 300mA
- 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
- Capacitance @ Vr, F:
- 10pF @ 1V, 1MHz
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
- Operating Temperature - Junction:
- -40°C ~ 150°C
BAT54WFILMY FAQ
1.How can I place an order for BAT54WFILMY through Aetrix?
Please submit a Request for Quotation (RFQ) for BAT54WFILMY 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 BAT54WFILMY reliable?
The price and inventory of BAT54WFILMY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAT54WFILMY is usually 5 days.
3.What payment methods are accepted for BAT54WFILMY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAT54WFILMY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAT54WFILMY?
BAT54WFILMY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAT54WFILMY 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 BAT54WFILMY?
For technical support, including BAT54WFILMY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAT54WFILMY requirements.
6.How does Aetrix verify that BAT54WFILMY is sourced from the original manufacturer or authorized distributors?
All BAT54WFILMY 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 BAT54WFILMY meets industry standards.
7.What is the process for return or replacement of BAT54WFILMY?
All BAT54WFILMY units undergo pre-shipment inspection (PSI). If there is an issue with BAT54WFILMY, 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 BAT54WFILMY part is unused and in its original packaging.
Return procedure for BAT54WFILMY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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