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STMicroelectronics BAT54AFILM
- Part No.:
- BAT54AFILM
- Manufacturer:
- STMicroelectronics
- Category:
- Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BAT54AFILM.pdf
- Description:
- DIODE ARR SCHOT 40V 300MA SOT233
- Quantity:
- Payment:
- Shipping:
Inventory:39,738
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Product details
Overview
BAT54AFILM from STMicroelectronics is a common-anode dual Schottky diode in SOT-23 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 high-speed polarity protection and OR-ing circuits in portable power management.
For engineers reviewing the BAT54AFILM datasheet, BAT54AFILM pinout, BAT54AFILM application, or BAT54AFILM equivalent, key selection criteria include low forward voltage (400 mV at 10 mA), negligible switching losses, ECOPACK®2 compliance, and thermal resistance of 500 °C/W (junction-to-ambient on epoxy PCB).
Technical Context
The BAT54AFILM integrates two Schottky diodes sharing a common anode terminal, enabling bidirectional blocking with single-point anode connection in redundancy or voltage-source selection circuits. Its low 0.4 V forward drop at 10 mA and sub-5 ns trr support efficient operation in DC-DC converter output stages and USB port protection.
Designed for surface-mount assembly on standard FR4 PCBs, it leverages SOT-23's proven thermal performance (Rth(j-a) = 500 °C/W with recommended pad layout) and meets UL94 V0 flammability requirements. The device operates across –40 °C to +150 °C junction temperature range and supports reflow soldering up to 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum reverse voltage before breakdown; enables use in 24 V industrial bus and 5 V/12 V system-level protection. |
| IF (continuous) | 300 mA - Sustained forward current capability; suitable for low-power load-switching and signal-level clamping. |
| VF @ 10 mA | 400 mV typ - Low conduction loss reduces heat generation and improves efficiency in battery-powered devices. |
| C (typ) | 7 pF @ 1 V - Minimal junction capacitance preserves signal integrity in RF detector and high-frequency rectifier applications. |
| trr | 5 ns - Ultrafast recovery prevents reverse conduction during rapid polarity transitions in OR-ing and hot-swap circuits. |
| Tj (max) | +150 °C - Extended junction temperature rating allows reliable operation in enclosed or thermally constrained enclosures. |
| IR @ 30 V, 25 °C | 1 µA max - Low leakage maintains voltage isolation in standby modes and precision reference paths. |
Pinout & Package
SOT-23 package: 3-pin plastic surface-mount package with gull-wing leads, 1.4 mm body width, 2.9 mm length, and 1.1–1.3 mm height; compliant with JEDEC TO-236AB outline and RoHS/ECOPACK®2 environmental standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (common) | Shared anode node for both diodes; connects to positive supply rail in OR-ing configurations. |
| Pin 2 | Cathode (Diode 1) | Independent cathode for first diode; routes to load or secondary source in redundant power paths. |
| Pin 3 | Cathode (Diode 2) | Independent cathode for second diode; enables independent control or monitoring of dual input sources. |
Key Features
| Feature | Design Value |
|---|---|
| Common-anode dual configuration | Enables compact, single-package implementation of power-source OR-ing without external wiring between anodes. |
| Low VF (400 mV @ 10 mA) | Reduces forward conduction loss by >30% vs. comparable silicon diodes, extending battery life in portable systems. |
| 7 pF junction capacitance | Minimizes capacitive loading on high-speed data lines (e.g., USB D+/D−) when used as ESD clamp or signal protector. |
| ECOPACK®2 compliance | Meets strict halogen-free and lead-free requirements for automotive and industrial end-equipment certifications. |
| 150 °C max junction temperature | Supports operation in under-hood automotive modules and sealed industrial controllers without derating. |
Applications
| USB Port Polarity Protection | DC-DC Converter Output OR-ing |
|---|---|
Use Scenario: Preventing damage from reversed USB cable insertion in host-side ports or portable chargers. IC Role / Device Role / Timing Role: Dual Schottky diode configured as back-to-back anode-connected clamp, blocking reverse current while passing forward current with minimal drop. Use Value: Eliminates need for mechanical polarity detection; 400 mV VF ensures <2% voltage loss at 500 mA, preserving USB 2.0 signaling margins. | Use Scenario: Selecting between two independent 3.3 V DC-DC outputs in fault-tolerant embedded systems. IC Role / Device Role / Timing Role: Common-anode diode pair acting as passive OR-ing element, isolating failed supplies while maintaining uninterrupted load voltage. Use Value: 5 ns trr prevents shoot-through during supply switchover; 300 mA rating supports typical microcontroller I/O rail loads. |
| RF Detector Input Clamping | Low-Power Sensor Signal Conditioning |
Use Scenario: Protecting sensitive RF detector inputs (e.g., RSSI circuits) from ESD and overvoltage transients. IC Role / Device Role / Timing Role: Low-capacitance Schottky clamp placed at detector input node, shunting fast transients to ground. Use Value: 7 pF capacitance avoids detuning of 2.4 GHz matching networks; 1 µA IR preserves detector bias accuracy. | Use Scenario: Level-shifting and protecting analog sensor outputs (e.g., thermistor bridges) interfacing to ADC inputs. IC Role / Device Role / Timing Role: Anode-tied diode pair used as bidirectional voltage limiter, clamping signals to ±0.4 V around reference. Use Value: Sub-5 ns response captures transient spikes before ADC sampling; low VF ensures minimal offset error in precision measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DMN2016LFG-7 | Single-channel MOSFET-based load switch (not diode); 20 V max, 1.6 A rating; requires gate drive. | Active control required; unsuitable for passive OR-ing or clamping without external logic. | Select only if programmable on/off control and ultra-low RDS(on) (<40 mΩ) outweigh passive simplicity. |
| BAT54CWS-7-F | Common-cathode dual Schottky in SOD-323; identical VF/trr/C specs but different pinout and polarity configuration. | Requires circuit redesign to route cathodes together instead of anodes; incompatible pin-for-pin replacement. | Choose only when board layout permits cathode-common topology and smaller SOD-323 footprint is prioritized. |
Compared with BAT54AFILM, DMN2016LFG-7 adds active control but increases BOM count and complexity, while BAT54CWS-7-F offers identical electrical performance in a smaller package but mandates layout revision due to reversed terminal configuration.
Availability
BAT54AFILM is available at Aetrix Electronics and suitable for USB power protection, DC-DC OR-ing, and RF detector clamping requiring stable component supply and full production lifecycle assurance.
Supply support for BAT54AFILM 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, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.
The BAT54 series belongs to ST's small-signal discrete portfolio, engineered specifically for high-efficiency, high-speed protection and signal routing in space-constrained portable and embedded systems.
FAQ
What is the maximum continuous forward current rating for BAT54AFILM?
The BAT54AFILM is rated for 300 mA continuous forward current per diode at Tj = 25 °C with recommended PCB pad layout. Derating is required above 25 °C ambient; at 70 °C ambient, maximum usable current drops to approximately 220 mA based on its 500 °C/W junction-to-ambient thermal resistance.
Is BAT54AFILM suitable for USB 2.0 data line protection?
Yes - its 7 pF typical junction capacitance at 1 V reverse bias minimizes signal distortion on 480 Mbps USB 2.0 differential pairs, and its 400 mV forward voltage ensures clamping occurs below the 3.6 V absolute maximum rating of most USB transceivers without interfering with normal signal swing.
How does the common-anode configuration affect PCB layout compared to common-cathode variants?
The common-anode configuration places both anodes on Pin 1, simplifying connection to a shared positive rail and reducing trace count in OR-ing applications. In contrast, common-cathode variants (e.g., BAT54CFILM) require tying cathodes together - often necessitating a star ground or dedicated copper pour - increasing layout complexity for dual-supply selection.
Does BAT54AFILM meet automotive AEC-Q200 stress test requirements?
No - BAT54AFILM is not AEC-Q200 qualified. It is specified for industrial and commercial applications with operating junction temperature from –40 °C to +150 °C, but lacks the extended temperature cycling, humidity bias, and mechanical shock validation required for automotive-grade qualification.
BAT54AFILM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Diode Configuration:
- 1 Pair Common Anode
- 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-23-3
BAT54AFILM FAQ
1.How can I place an order for BAT54AFILM through Aetrix?
Please submit a Request for Quotation (RFQ) for BAT54AFILM 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 BAT54AFILM reliable?
The price and inventory of BAT54AFILM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAT54AFILM is usually 5 days.
3.What payment methods are accepted for BAT54AFILM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAT54AFILM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAT54AFILM?
BAT54AFILM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAT54AFILM 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 BAT54AFILM?
For technical support, including BAT54AFILM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAT54AFILM requirements.
6.How does Aetrix verify that BAT54AFILM is sourced from the original manufacturer or authorized distributors?
All BAT54AFILM 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 BAT54AFILM meets industry standards.
7.What is the process for return or replacement of BAT54AFILM?
All BAT54AFILM units undergo pre-shipment inspection (PSI). If there is an issue with BAT54AFILM, 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 BAT54AFILM part is unused and in its original packaging.
Return procedure for BAT54AFILM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAT54AFILM Tags
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BAT54C-7-F
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BAV99,215
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BAV99LT1G
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MMBD1503-TP
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