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STMicroelectronics BAT54KFILM
- Part No.:
- BAT54KFILM
- Manufacturer:
- STMicroelectronics
- Category:
- Single Diodes
- Package:
- SC-79, SOD-523
- Datasheet:
-
BAT54KFILM.pdf
- Description:
- DIODE SCHOTTKY 40V 300MA SOD523
- Quantity:
- Payment:
- Shipping:
Inventory:40,330
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Product details
Overview
BAT54KFILM from STMicroelectronics is a single small-signal Schottky diode in SOD-523 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 switching or clamping diode in low-voltage DC-DC converter feedback paths and USB signal line protection circuits.
For engineers reviewing the BAT54KFILM datasheet, BAT54KFILM pinout, BAT54KFILM application, or BAT54KFILM equivalent, key selection criteria include ultra-low forward voltage (400 mV at 10 mA), negligible reverse recovery charge, thermal resistance of 600 °C/W (junction-to-ambient), ECOPACK®2 compliance, and SOD-523 footprint compatibility with space-constrained portable electronics designs.
Technical Context
The BAT54KFILM implements a platinum-silicide Schottky barrier structure optimized for minimal conduction loss and near-zero minority-carrier storage. Its low 0.4 V forward drop at 10 mA enables efficient operation in 3.3 V and lower supply rails.
Designed for surface-mount use in high-frequency switching applications, it exhibits 7 pF capacitance at 1 V reverse bias and achieves 5 ns trr under IF = IR = 10 mA conditions - enabling reliable performance in >100 MHz signal routing and RF detector circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - supports reverse blocking in 24 V industrial I/O and 36 V automotive subsystems without breakdown. |
| IF (continuous) | 300 mA - sufficient for LED biasing, logic-level clamping, and low-power rectification in wearables. |
| VF @ 10 mA | 400 mV typ - reduces power loss by >60% vs. standard silicon diodes in 1.8–3.3 V rail clamping. |
| C @ 1 V | 7 pF typ - enables clean signal integrity in USB 2.0 data lines and high-speed GPIO protection. |
| trr | 5 ns - ensures minimal switching distortion in PWM dimming control and RF envelope detection. |
| Tj (max) | 150 °C - allows operation in sealed enclosures with ambient temperatures up to +85 °C. |
| Rth(j-a) | 600 °C/W - requires minimal copper pour for thermal management on 1-layer PCBs in compact modules. |
Pinout & Package
Package: SOD-523 - ultra-miniature plastic surface-mount package (0.6 × 1.6 mm footprint) with gull-wing leads, optimized for automated placement in high-density mobile and IoT assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to higher-potential node in clamping or rectification; polarity-sensitive during layout. |
| Cathode | Forward current exit / reverse blocking terminal | Typically tied to ground or reference rail; forms low-impedance path for ESD transients in I/O protection. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-fast switching | 5 ns reverse recovery time enables use in >100 MHz clock signal steering and RF detector front-ends. |
| Low forward voltage | 400 mV at 10 mA minimizes voltage drop in battery-powered sensor node power-rail clamping. |
| Low junction capacitance | 7 pF at 1 V reverse bias preserves signal rise/fall times in high-speed digital interface protection. |
| ECOPACK®2 compliance | Meets RoHS and halogen-free requirements for consumer electronics and medical wearable certifications. |
| SOD-523 footprint | 0.6 × 1.6 mm body size supports miniaturization in Bluetooth LE modules and hearing aid PCBs. |
Applications
| USB 2.0 Data Line Protection | Low-Voltage DC-DC Feedback Clamp |
|---|---|
|
Use Scenario: Protecting D+ and D− lines against ESD and overvoltage in portable USB peripherals. IC Role / Device Role / Timing Role: Signal-line clamp diode placed between data line and VBUS or ground. Use Value: 7 pF capacitance avoids signal degradation at 480 Mbps; 5 ns trr prevents data eye closure. |
Use Scenario: Clamping feedback voltage at the error amplifier input of buck converters operating below 5 V. IC Role / Device Role / Timing Role: Precision voltage limiter preventing op-amp saturation during load transients. Use Value: 400 mV VF ensures accurate regulation threshold without offset error in 3.3 V/1.8 V systems. |
| RF Detector Input Stage | IoT Sensor Node Power-Rail Clamp |
|
Use Scenario: Demodulating RF envelope signals in sub-GHz ISM band receivers (e.g., 868/915 MHz). IC Role / Device Role / Timing Role: Zero-bias Schottky detector element converting RF to DC baseband. Use Value: Near-zero stored charge enables linear detection response up to 1 GHz with <1 dB insertion loss. |
Use Scenario: Preventing negative voltage excursions on microcontroller I/O pins during hot-plug events. IC Role / Device Role / Timing Role: Bidirectional ESD clamp connected between I/O and VDD/GND rails. Use Value: 300 mA IF rating handles IEC 61000-4-2 contact discharge pulses without parametric shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NSR0230HT1G | 0.3 A IF, 30 V VRRM, 12 pF C, SOD-523 package | Lower reverse voltage rating limits use in 24 V industrial interfaces | Select when cost sensitivity outweighs 40 V margin and 7 pF capacitance requirement |
| SD103ATW-7-F | 0.2 A IF, 40 V VRRM, 10 pF C, SOD-523 package | Higher VF (550 mV @ 10 mA) increases power loss in battery-critical designs | Prefer for legacy designs where 550 mV VF is acceptable and second-source qualification exists |
Compared with NSR0230HT1G and SD103ATW-7-F, BAT54KFILM delivers superior high-frequency performance via its 7 pF capacitance and 400 mV VF, making it optimal for USB 2.0 and energy-sensitive IoT nodes - whereas alternatives trade off speed or efficiency for cost or qualification breadth.
Availability
BAT54KFILM is available at Aetrix Electronics and suitable for USB interface protection, DC-DC feedback clamping, and RF detector circuits requiring stable component supply across high-mix, low-volume production runs.
Supply support for BAT54KFILM 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 analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
The BAT54 series belongs to ST's precision discrete portfolio, engineered specifically for high-speed signal integrity and low-loss power management in space-constrained portable and wireless devices.
FAQ
What is the maximum junction temperature for BAT54KFILM?
The absolute maximum operating junction temperature is +150 °C, verified per Table 2 of the official datasheet (DocID5505 Rev 12). This rating applies under continuous DC forward current conditions with appropriate PCB thermal relief, and permits use in sealed enclosures up to +85 °C ambient with derated current.
Is BAT54KFILM suitable for bidirectional ESD protection?
No - BAT54KFILM is a single-anode/single-cathode Schottky diode and conducts only in one direction. For bidirectional ESD clamping, two BAT54KFILM devices must be connected in series opposition, or a dedicated dual-rail TVS like SMF05CT should be used instead.
Does BAT54KFILM have a specified reverse recovery charge (Qrr)?
Qrr is not explicitly specified in the datasheet; however, the 5 ns trr value (Table 5) and negligible minority-carrier storage inherent to Schottky construction indicate Qrr < 1 pC - sufficiently low for use in 100+ MHz switching applications without tail current concerns.
Can BAT54KFILM replace BAT54FILM in existing SOT-23 layouts?
No - BAT54KFILM uses the SOD-523 package (0.6 × 1.6 mm), while BAT54FILM uses SOT-23 (2.9 × 1.3 mm). The footprints are mechanically incompatible; redesign of solder pads and stencil apertures is required to migrate from SOT-23 to SOD-523.
BAT54KFILM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- SC-79, SOD-523
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-523
- Operating Temperature - Junction:
- -40°C ~ 150°C
BAT54KFILM FAQ
1.How can I place an order for BAT54KFILM through Aetrix?
Please submit a Request for Quotation (RFQ) for BAT54KFILM 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 BAT54KFILM reliable?
The price and inventory of BAT54KFILM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAT54KFILM is usually 5 days.
3.What payment methods are accepted for BAT54KFILM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAT54KFILM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAT54KFILM?
BAT54KFILM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAT54KFILM 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 BAT54KFILM?
For technical support, including BAT54KFILM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAT54KFILM requirements.
6.How does Aetrix verify that BAT54KFILM is sourced from the original manufacturer or authorized distributors?
All BAT54KFILM 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 BAT54KFILM meets industry standards.
7.What is the process for return or replacement of BAT54KFILM?
All BAT54KFILM units undergo pre-shipment inspection (PSI). If there is an issue with BAT54KFILM, 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 BAT54KFILM part is unused and in its original packaging.
Return procedure for BAT54KFILM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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