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STMicroelectronics BAT54SWFILM
- Part No.:
- BAT54SWFILM
- Manufacturer:
- STMicroelectronics
- Category:
- Diode Arrays
- Package:
- SC-70, SOT-323
- Datasheet:
-
BAT54SWFILM.pdf
- Description:
- DIODE ARR SCHOT 40V 300MA SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:18,347
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Product details
Overview
BAT54SWFILM 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. It serves as a high-speed signal clamping or polarity protection device in low-voltage DC-DC converter feedback paths and USB data line ESD protection circuits.
For engineers reviewing the BAT54SWFILM datasheet, BAT54SWFILM pinout, BAT54SWFILM application, or BAT54SWFILM equivalent, key selection criteria include its series diode configuration, ultra-low trr, low VF at 10 mA (400 mV typ), thermal resistance of 550 °C/W (junction-to-ambient), and ECOPACK®2 compliance for RoHS-compliant assembly.
Technical Context
The BAT54SWFILM integrates two Schottky diodes in series within a single SOT-323 package, enabling bidirectional clamping or cascaded voltage drop control without external interconnects. Its low 0.4 V forward voltage at 10 mA and negligible minority-carrier storage support operation in 1–10 MHz switching applications.
Designed for surface-mount use in space-constrained layouts, it leverages planar Schottky barrier technology to achieve <5 ns reverse recovery and <1 µA reverse leakage at 30 V and 25 °C - critical for maintaining signal integrity in high-frequency analog front-ends and USB 2.0 interface protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - supports input rail clamping up to 36 V systems without breakdown |
| IF (continuous) | 300 mA - sufficient for biasing, level-shifting, and low-power signal routing |
| trr | 5 ns - enables clean switching in >10 MHz digital signal conditioning paths |
| C (typ) | 7 pF at 1 V - minimizes capacitive loading on high-impedance nodes like op-amp inputs |
| VF @ 10 mA | 400 mV typ - reduces forward conduction loss in low-voltage (<3.3 V) logic-level interfaces |
| Tj (max) | 150 °C - allows operation in thermally demanding industrial ambient environments |
| Rth(j-a) | 550 °C/W - defines power derating slope on standard FR4 PCB with recommended pad layout |
Pinout & Package
Package: SOT-323 - three-terminal plastic surface-mount package with 1.15–1.35 mm body width, 1.8–2.4 mm height, and 0.6–0.7 mm lead pitch; optimized for automated placement and reflow soldering per JEDEC MS-012.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode A) | Input anode of first diode | Connects to signal source or higher-potential node in series clamp chain |
| 2 (Cathode A / Anode B) | Shared internal node | Electrically ties cathode of D1 to anode of D2; not externally accessible |
| 3 (Cathode B) | Output cathode of second diode | Routes clamped or rectified output to load or reference point |
Key Features
| Feature | Design Value |
|---|---|
| Series diode topology | Enables precise 0.8 V forward drop (2 × VF) for dual-threshold clamping without external wiring |
| ECOPACK®2 compliance | Meets EU RoHS Directive 2011/65/EU and halogen-free requirements for green manufacturing |
| Low IR at 100 °C | 100 µA max reverse leakage at VR = 30 V ensures stable bias in hot automotive cabin modules |
| Fast trr & low C | 5 ns recovery + 7 pF capacitance preserves edge fidelity in USB 2.0 D+/D− lines |
| SOT-323 thermal performance | 550 °C/W Rth(j-a) allows 120 mW dissipation at 50 °C ambient with standard PCB layout |
Applications
| USB 2.0 Data Line Protection | DC-DC Converter Feedback Clamp |
|---|---|
Use Scenario: Protecting D+ and D− lines against ±15 kV HBM ESD events while preserving signal rise/fall times. IC Role / Device Role / Timing Role: Series-connected Schottky clamp limiting voltage excursion to <0.8 V above VDD or below GND during transients. Use Value: Prevents damage to USB transceiver I/O cells without adding measurable propagation delay or jitter. |
Use Scenario: Clamping error amplifier feedback node in buck converter ICs to prevent saturation during startup or overload. IC Role / Device Role / Timing Role: Dual-diode series path sets precise 0.8 V clamp threshold independent of supply rail variation. Use Value: Enables fast transient recovery and avoids regulator latch-up by holding FB pin within linear operating range. |
| Low-Voltage Logic Level Shifter | High-Frequency Signal Rectifier |
Use Scenario: Translating 1.8 V logic signals to 3.3 V domain in mixed-voltage FPGA I/O banks. IC Role / Device Role / Timing Role: Forward-biased series diodes provide fixed 0.8 V offset between domains with minimal loading. Use Value: Achieves sub-nanosecond propagation delay and eliminates need for active level-shifter ICs or resistive dividers. |
Use Scenario: Peak detection in 5–20 MHz RF envelope detectors for wireless sensor node receivers. IC Role / Device Role / Timing Role: Low-C, low-trr Schottky pair rectifies fast AC waveforms with <100 ps timing skew between channels. Use Value: Delivers accurate amplitude tracking without droop or ringing due to stored charge or parasitic capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-series Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NSR0230HT1G | Single SOD-323 Schottky (0.3 A, 30 V); no internal series connection | Requires external series wiring for dual-drop behavior; adds 0.3 mm layout area and parasitic inductance | Select only if discrete layout flexibility outweighs integration benefit and board space savings of BAT54SWFILM |
| DMN2016LFG-7 | Single-channel MOSFET-based load switch (20 V, 1.6 A); not a diode | Provides active ON/OFF control but lacks inherent reverse-blocking and clamping symmetry | Choose only when programmable enable and low RDS(on) are required over passive clamping functionality |
Compared with NSR0230HT1G and DMN2016LFG-7, BAT54SWFILM uniquely delivers integrated dual-series Schottky behavior in one SOT-323 footprint - reducing component count, eliminating trace inductance, and guaranteeing matched VF and trr across both diodes for symmetrical transient response.
Availability
BAT54SWFILM is available at Aetrix Electronics and suitable for USB interface protection, DC-DC feedback clamping, and low-voltage logic translation requiring stable component supply, full production status, and long-term manufacturability assurance.
Supply support for BAT54SWFILM 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 industrial, automotive, and consumer markets.
The BAT54 series belongs to ST's small-signal Schottky diode product line, engineered specifically for high-speed signal integrity, low-loss clamping, and compact power management in portable and space-constrained electronics.
FAQ
What is the maximum continuous forward current rating for BAT54SWFILM?
The BAT54SWFILM is rated for 300 mA continuous forward current at Tj = 25 °C. Derating is required above 25 °C ambient; at 70 °C ambient on a standard FR4 PCB, maximum usable IF drops to approximately 180 mA due to its 550 °C/W junction-to-ambient thermal resistance.
Does BAT54SWFILM support bidirectional ESD protection?
No - BAT54SWFILM is a unidirectional series diode pair (Anode–Cathode–Anode–Cathode). For bidirectional protection, two BAT54SWFILM units must be placed back-to-back, or a dedicated bidirectional TVS like SMF05CT should be used instead.
How does the SOT-323 package affect thermal performance compared to SOT-23?
The SOT-323 package has higher thermal resistance (550 °C/W) than SOT-23 (500 °C/W) for the BAT54 series due to smaller copper pad area and shorter leads. This results in ~10% lower power dissipation capability at the same ambient temperature, requiring tighter layout attention to thermal pads.
Is BAT54SWFILM suitable for 5 V tolerant I/O clamping?
Yes - with VRRM = 40 V and VF ≈ 400 mV at 10 mA, BAT54SWFILM can safely clamp 5 V logic signals to 3.3 V rails (e.g., clamping D+ to 3.3 V VDD) without forward conduction during normal operation, provided the clamping reference is held at ≤4.2 V.
BAT54SWFILM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
BAT54SWFILM FAQ
1.How can I place an order for BAT54SWFILM through Aetrix?
Please submit a Request for Quotation (RFQ) for BAT54SWFILM 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 BAT54SWFILM reliable?
The price and inventory of BAT54SWFILM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAT54SWFILM is usually 5 days.
3.What payment methods are accepted for BAT54SWFILM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAT54SWFILM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAT54SWFILM?
BAT54SWFILM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAT54SWFILM 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 BAT54SWFILM?
For technical support, including BAT54SWFILM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAT54SWFILM requirements.
6.How does Aetrix verify that BAT54SWFILM is sourced from the original manufacturer or authorized distributors?
All BAT54SWFILM 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 BAT54SWFILM meets industry standards.
7.What is the process for return or replacement of BAT54SWFILM?
All BAT54SWFILM units undergo pre-shipment inspection (PSI). If there is an issue with BAT54SWFILM, 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 BAT54SWFILM part is unused and in its original packaging.
Return procedure for BAT54SWFILM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAT54SWFILM Tags
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BAV99,215
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BAV99LT1G
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