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STMicroelectronics BAT54CFILM
- Part No.:
- BAT54CFILM
- Manufacturer:
- STMicroelectronics
- Category:
- Diode Arrays
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BAT54CFILM.pdf
- Description:
- DIODE ARR SCHOT 40V 300MA SOT233
- Quantity:
- Payment:
- Shipping:
Inventory:42,494
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Product details
Overview
BAT54CFILM from STMicroelectronics is a dual common-cathode 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. It enables high-frequency clamping and steering in USB data lines, low-voltage DC-DC converter freewheeling paths, and ESD protection circuits where fast switching and low forward drop are critical.
For engineers reviewing the BAT54CFILM datasheet, BAT54CFILM pinout, BAT54CFILM application, or BAT54CFILM equivalent, key selection criteria include its common-cathode configuration, 400 mV forward voltage at 10 mA, 100 µA reverse leakage at 100 °C, thermal resistance of 500 °C/W (junction-to-ambient), and ECOPACK®2 compliance for RoHS-compliant manufacturing.
Technical Context
The BAT54CFILM integrates two independent Schottky diodes sharing a single cathode terminal, enabling compact dual-path rectification or bidirectional signal clamping without external node tying. Its low 0.4 V forward voltage at 10 mA and negligible minority-carrier storage support operation up to 100 MHz in RF detector and mixer bias networks.
Designed for surface-mount assembly on standard epoxy FR4 PCBs, it leverages the SOT-23 footprint's thermal performance (Rth(j-a) = 500 °C/W) under recommended pad layout, while its 150 °C maximum junction temperature supports use in automotive under-hood and industrial power supply environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Supports reverse blocking in 3.3 V/5 V logic-level signal rails and 12 V auxiliary power domains. |
| IF | 300 mA - Sustains continuous current in low-power DC-DC synchronous rectifier legs and LED bias chains. |
| C (typ) | 7 pF - Minimizes capacitive loading on high-speed digital I/O lines such as USB 2.0 D+/D− and I²C buses. |
| trr | 5 ns - Enables clean switching in 20+ MHz clock distribution networks and RF envelope detectors. |
| VF @ 10 mA | 400 mV - Reduces conduction loss by >60% versus silicon diodes, improving efficiency in battery-powered sensor nodes. |
| IR @ 100 °C | 100 µA - Limits standby leakage in always-on microcontroller reset supervisors and backup power switches. |
Pinout & Package
Package: SOT-23 - Three-terminal plastic surface-mount package with 1.7 mm × 2.9 mm body, 0.95 mm height, and gull-wing leads compatible with IPC-7351B standard land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode A) | First anode connection | Accepts forward current from independent source path A; electrically isolated from Pin 3. |
| 2 (Cathode) | Shared cathode node | Common return path for both diodes; must be routed to system ground or negative rail with low-inductance trace. |
| 3 (Anode B) | Second anode connection | Accepts forward current from independent source path B; electrically isolated from Pin 1. |
Key Features
| Feature | Design Value |
|---|---|
| Common-cathode dual diode topology | Reduces board space by 40% vs. two discrete SOT-23 Schottkys; eliminates interconnect inductor in shared-return applications. |
| ECOPACK®2 compliance | Meets EU RoHS Directive 2011/65/EU and halogen-free requirements without compromising thermal or electrical performance. |
| Low Cj (7 pF typ) | Preserves signal integrity in 50 Ω RF paths up to 2 GHz; verified via 1 MHz capacitance measurement at 1 V reverse bias. |
| Fast trr (5 ns) | Eliminates switching tail artifacts in PWM-driven analog multiplexers and high-side current sense shunt protectors. |
| Tj(max) = 150 °C | Enables operation in sealed enclosures with ambient temperatures up to +105 °C when derated per Figure 2 in datasheet. |
Applications
| USB 2.0 Data Line Protection | Low-Voltage DC-DC Freewheeling |
|---|---|
|
Use Scenario: Clamping transient overvoltage on D+ and D− lines during hot-plug events or ESD discharge. IC Role / Device Role: Dual-channel bidirectional clamp using common-cathode configuration tied to 3.3 V rail. Use Value: 400 mV forward drop ensures clamping threshold stays below USB 2.0 eye diagram mask; 7 pF capacitance avoids signal rise-time degradation. |
Use Scenario: Freewheeling path in synchronous buck converter output stage operating at 1.2 V/2 A. IC Role / Device Role: Low-loss catch diode replacing MOSFET body diode during dead-time intervals. Use Value: 5 ns trr prevents reverse recovery current spikes that cause gate ringing in high-side FETs. |
| Microcontroller Reset Supervisor | RF Detector Bias Network |
|
Use Scenario: Power-fail detection and brown-out reset generation using resistor-divider input monitoring. IC Role / Device Role: Reverse-polarity protection diode on supervisor IC VCC input pin. Use Value: 100 µA leakage at 100 °C ensures <1 µA total quiescent current draw in battery-backed systems. |
Use Scenario: DC bias injection into GaAs FET gate for RF power amplifier linearization. IC Role / Device Role: Low-capacitance DC feed-through diode isolating RF from bias supply. Use Value: 7 pF Cj minimizes RF shunting at 900 MHz ISM band; 40 V rating accommodates 28 V bias rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DMG1012TQ-7 | Single-channel, 20 V VRRM, 0.6 A IF, SOT-563 package | Lacks common-cathode topology; requires external cathode tie for dual use | Select when higher current handling is needed and board space allows discrete routing. |
| BAT54CWS-7-F | Same common-cathode function but in SOD-323 (1.52 × 1.80 mm); Rth(j-a) = 550 °C/W | Smaller footprint but lower thermal dissipation margin at >200 mA | Select for ultra-compact layouts where 50 mA average current suffices and thermal headroom is managed externally. |
Compared with DMG1012TQ-7 and BAT54CWS-7-F, BAT54CFILM provides optimal balance of thermal robustness (500 °C/W), standardized SOT-23 assembly compatibility, and integrated dual-cathode functionality-making it preferred for production designs requiring reliability across automotive and industrial temperature ranges.
Availability
BAT54CFILM is available at Aetrix Electronics and suitable for USB interface protection, low-voltage DC-DC converter freewheeling, and microcontroller reset supervision requiring stable component supply across extended temperature and lifecycle conditions.
Supply support for BAT54CFILM 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, mixed-signal, power, and microcontroller products 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 power path management, and space-constrained PCB layouts in portable and embedded systems.
FAQ
What is the maximum continuous forward current rating for BAT54CFILM?
The BAT54CFILM is rated for 300 mA continuous forward current at Tj = 25 °C with proper PCB copper area per ST's recommended SOT-23 pad layout. Derating is required above 25 °C ambient; at 70 °C ambient, maximum usable current drops to approximately 210 mA based on thermal resistance of 500 °C/W and 150 °C max junction temperature.
Does BAT54CFILM support reflow soldering per JEDEC J-STD-020?
Yes, BAT54CFILM is qualified for lead-free reflow soldering with a peak temperature of 260 °C for 10 seconds maximum, matching JEDEC J-STD-020D Level 1 requirements. The device uses matte tin plating and meets ST's ECOPACK®2 environmental specifications, including halogen-free and RoHS compliance.
How does the common-cathode configuration affect PCB layout compared to dual discrete diodes?
The common-cathode configuration reduces net count by one, eliminating the need for a dedicated copper pour or trace to join two separate cathodes. This simplifies routing in dense layouts, lowers parasitic inductance between cathodes, and improves consistency in clamping voltage across both channels-critical in differential signal protection like USB or RS-485.
Can BAT54CFILM be used in 24 V automotive applications?
No-BAT54CFILM has a 40 V repetitive peak reverse voltage rating, which provides insufficient margin for 24 V automotive load-dump transients (ISO 7637-2 Pulse 5a: up to 110 V). It is suitable for 12 V systems with clamping circuits or non-transient-exposed subcircuits (e.g., infotainment USB ports), but not for direct battery-rail connection in 24 V commercial vehicles.
BAT54CFILM 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 Cathode
- 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
BAT54CFILM FAQ
1.How can I place an order for BAT54CFILM through Aetrix?
Please submit a Request for Quotation (RFQ) for BAT54CFILM 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 BAT54CFILM reliable?
The price and inventory of BAT54CFILM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAT54CFILM is usually 5 days.
3.What payment methods are accepted for BAT54CFILM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAT54CFILM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAT54CFILM?
BAT54CFILM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAT54CFILM 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 BAT54CFILM?
For technical support, including BAT54CFILM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAT54CFILM requirements.
6.How does Aetrix verify that BAT54CFILM is sourced from the original manufacturer or authorized distributors?
All BAT54CFILM 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 BAT54CFILM meets industry standards.
7.What is the process for return or replacement of BAT54CFILM?
All BAT54CFILM units undergo pre-shipment inspection (PSI). If there is an issue with BAT54CFILM, 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 BAT54CFILM part is unused and in its original packaging.
Return procedure for BAT54CFILM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAT54CFILM Tags
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BAV99-7-F
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BAT54C-7-F
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BAV99,215
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BAT54S-7-F
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BAV99LT1G
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BAT54S,215
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