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Diodes Incorporated B540CQ-13-F
- Part No.:
- B540CQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
B540CQ-13-F.pdf
- Description:
- DIODE SCHOTTKY 40V 5A SMC
- Quantity:
- Payment:
- Shipping:
Inventory:7,962
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Product details
Overview
B540CQ-13-F from Diodes Incorporated is a 40 V, 5.0 A surface-mount Schottky barrier rectifier in SMC package, featuring 0.55 V max forward voltage at 5.0 A and 0.5 mA max reverse leakage at rated VR, designed for polarity protection and freewheeling in low-voltage DC/DC converters and automotive power modules.
For engineers reviewing the B540CQ-13-F datasheet, B540CQ-13-F pinout, B540CQ-13-F application, or B540CQ-13-F equivalent, key selection criteria include its 40 V reverse voltage rating, low VF for reduced conduction loss, SMC thermal performance (RθJT = 10 °C/W), and AEC-Q qualified construction for automotive-grade reliability.
Technical Context
This Schottky rectifier uses guard ring die construction to enhance transient surge immunity and suppress avalanche-induced failure during inductive switching events. Its low junction-to-terminal thermal resistance (10 °C/W) enables sustained 5.0 A operation with minimal heatsinking on standard PCB copper pads.
The device operates across –55 °C to +150 °C junction temperature range and maintains stable reverse leakage (<0.5 mA at 25 °C, <20 mA at 100 °C) under rated blocking voltage, supporting high-efficiency, high-frequency rectification in compact power supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse voltage before breakdown; sets safe operating margin for 24 V system bus clamping. |
| IO | 5.0 A - Average rectified output current at TA = 25 °C; supports continuous 12 V/5 A DC-DC output stage. |
| VF Max | 0.55 V @ 5.0 A - Forward voltage drop defining conduction loss; yields ~2.75 W dissipation at full load. |
| IR Max | 0.5 mA @ 40 V, 25 °C - Reverse leakage limiting standby power loss in battery-backed circuits. |
| RθJT | 10 °C/W - Junction-to-terminal thermal resistance; enables direct thermal coupling to copper pour without external heatsink. |
| IFSM | 100 A @ 8.3 ms - Non-repetitive surge rating; withstands motor startup or capacitor inrush transients. |
| CT | 300 pF @ 4 V, 1 MHz - Junction capacitance affecting high-frequency switching noise and EMI filtering design. |
Pinout & Package
Package: SMC (DO-214AB), molded plastic body with matte tin-plated terminals, cathode indicated by band or notch, weight ≈ 0.21 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to source side (e.g., input rail or inductor switch node) in freewheeling path. |
| Cathode | Current exit point during forward conduction | Connected to return path (e.g., ground or output capacitor negative) - marked with band. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring die construction | Improves surge robustness against repetitive inductive turn-off spikes without derating. |
| Low VF (0.55 V max) | Reduces conduction loss by >30% vs. comparable silicon rectifiers, improving efficiency in 5–24 V systems. |
| AEC-Q qualified | Validated per JEDEC standards for automotive applications including engine control and body electronics. |
| Lead-free, halogen-free | Meets RoHS 3 and "Green" definitions (Br+Cl <1500 ppm, Sb <1000 ppm) for eco-compliant manufacturing. |
Applications
| Automotive Body Control Module | Industrial DC-DC Converter |
|---|---|
Use Scenario: Reverse polarity protection on 12 V supply input of BCM microcontroller and CAN transceiver circuitry. IC Role / Device Role / Timing Role: Unidirectional current gate preventing damage from incorrect battery connection. Use Value: Enables field-serviceable installation without risk of catastrophic short; leverages 0.55 V VF to minimize voltage drop in always-on supply path. | Use Scenario: Freewheeling diode in synchronous buck converter output stage delivering 5 V/5 A to PLC I/O modules. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during high-side MOSFET off-time. Use Value: Reduces power loss by 1.8 W vs. standard silicon diode, lowering thermal stress on 2-layer PCB layout. |
| Telecom Power Supply | Consumer USB-C PD Adapter |
Use Scenario: Output rectification in isolated flyback secondary for 48 V telecom shelf management unit. IC Role / Device Role / Timing Role: High-frequency rectifier handling 100 kHz switching with minimal reverse recovery loss. Use Value: 300 pF junction capacitance minimizes ringing and EMI generation at 100–500 kHz operating frequencies. | Use Scenario: Input polarity protection for dual-role USB-C port supporting 20 V/3 A PD negotiation. IC Role / Device Role / Timing Role: Bidirectional fault blocker ensuring safe hot-plug insertion regardless of cable orientation. Use Value: 40 V VRRM provides 2× margin over 20 V PD max, while 0.5 mA IR prevents battery drain in standby mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB540-E3/54 | Same 40 V/5 A rating, VF = 0.55 V, but TO-220AC package (RθJA = 40 °C/W vs. SMC's 50 °C/W). | Requires heatsink for sustained 5 A; unsuitable for space-constrained SMT-only designs. | Select when board-level thermal mass is limited and discrete heatsinking is available. |
| SS54HE3_A/H | 40 V/5 A, VF = 0.55 V, SMA package (smaller footprint, RθJA = 75 °C/W, lower surge rating: IFSM = 80 A). | Limited surge capability and higher thermal resistance restrict use in motor drive or high-inrush applications. | Select only for low-power, cost-sensitive consumer applications with infrequent transients. |
Compared with SB540-E3/54 and SS54HE3_A/H, B540CQ-13-F delivers superior thermal coupling (RθJT = 10 °C/W), AEC-Q qualification, and SMC mechanical robustness-making it the preferred choice for automotive and industrial SMT power stages requiring reliability and repeatable assembly.
Availability
B540CQ-13-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC-DC converters, and telecom power supplies requiring stable component supply with long-term lifecycle support.
Supply support for B540CQ-13-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The B520CQ–B560CQ series targets automotive and industrial power conversion, delivering AEC-Q qualified Schottky rectifiers optimized for low VF, high surge tolerance, and SMT manufacturability in harsh environments.
FAQ
What is the maximum junction temperature for continuous operation?
The B540CQ-13-F supports continuous operation up to +150 °C junction temperature, verified per JEDEC standards. Derating begins above +125 °C ambient, with DC forward current dropping linearly to zero at +150 °C terminal temperature per Figure 7 in DS13012 Rev. 18–2.
Is this part suitable for synchronous rectification?
No - B540CQ-13-F is a passive Schottky rectifier, not a synchronous rectifier controller or MOSFET driver. It functions as a unidirectional freewheeling or polarity protection diode, lacking gate drive capability or timing control logic required for active synchronous rectification.
Does the "Q" suffix indicate automotive qualification?
Yes - the "Q" in B540CQ-13-F denotes compliance with AEC-Q200 stress test requirements for passive components, confirmed in Diodes' product definitions and supported by qualification reports referenced in DS13012 Rev. 18–2.
How does the SMC package compare thermally to SMA or SMB?
SMC offers lower RθJT (10 °C/W) than SMA (≈15 °C/W) and SMB (≈12 °C/W), due to larger copper pad area and shorter thermal path. Its 6.9 mm × 4.4 mm footprint also provides better mechanical stability than smaller packages under thermal cycling in automotive applications.
B540CQ-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AB, SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 5A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 5 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 500 µA @ 40 V
- Capacitance @ Vr, F:
- 300pF @ 4V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
- Operating Temperature - Junction:
- -55°C ~ 150°C
B540CQ-13-F FAQ
1.How can I place an order for B540CQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for B540CQ-13-F 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 B540CQ-13-F reliable?
The price and inventory of B540CQ-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B540CQ-13-F is usually 5 days.
3.What payment methods are accepted for B540CQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B540CQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B540CQ-13-F?
B540CQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B540CQ-13-F 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 B540CQ-13-F?
For technical support, including B540CQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B540CQ-13-F requirements.
6.How does Aetrix verify that B540CQ-13-F is sourced from the original manufacturer or authorized distributors?
All B540CQ-13-F 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 B540CQ-13-F meets industry standards.
7.What is the process for return or replacement of B540CQ-13-F?
All B540CQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with B540CQ-13-F, 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 B540CQ-13-F part is unused and in its original packaging.
Return procedure for B540CQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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