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Diodes Incorporated B0540W-7-F
- Part No.:
- B0540W-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SOD-123
- Datasheet:
-
B0540W-7-F.pdf
- Description:
- DIODE SCHOTTKY 40V 500MA SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:26,940
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Product details
Overview
B0540W-7-F from Diodes Incorporated is a 0.5A surface-mount Schottky barrier rectifier in SOD123 package, featuring 40V peak repetitive reverse voltage, 0.51–0.62V forward voltage at 0.5A/25°C, and 5.5A non-repetitive surge current. It serves as a low-loss output rectifier in DC-DC converters for portable electronics and USB power delivery circuits.
For engineers reviewing the B0540W-7-F datasheet, B0540W-7-F pinout, B0540W-7-F application, or B0540W-7-F equivalent, key selection criteria include forward voltage drop at operating current, thermal resistance on FR-4 PCB (385°C/W), reverse leakage at 40V/100°C (13mA), and automotive-qualified variant availability (B0540WQ).
Technical Context
This Schottky diode uses guard ring construction to suppress transient-induced avalanche breakdown and improve reliability under voltage spikes. Its low forward voltage enables high-efficiency rectification in space-constrained 5V/3.3V point-of-load supplies.
Designed for surface-mount assembly on standard FR-4 PCBs, it achieves 0.5A average forward current with derating above +25°C ambient per Figure 5, and exhibits 170pF junction capacitance at 0V bias-critical for high-frequency switching noise control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum reverse voltage before breakdown; sets upper limit for input/output rail isolation in buck converters. |
| IF(AV) | 0.5 A - Continuous DC output current capability; defines usable load range in low-power SMPS designs. |
| VFM @ 0.5A/25°C | 0.51–0.62 V - Forward drop directly impacts conduction loss and thermal rise in compact layouts. |
| IFSM | 5.5 A - Surge rating supports inrush current handling during hot-plug events in USB-C PD adapters. |
| RθJA (FR-4) | 385 °C/W - Thermal resistance determines junction temperature rise under 0.5A load on minimal pad layout. |
| CT @ 1MHz/0V | 170 pF - Junction capacitance affects high-frequency switching noise and EMI filter design. |
Pinout & Package
Package: SOD123 - Surface-mount plastic case with cathode band marking; dimensions: 1.55mm × 2.65mm × 1.05mm (L × W × H); weight ≈ 0.01g; JEDEC-compliant, RoHS/Green certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry | Connected to lower-potential node (e.g., switch node in synchronous buck); polarity must match PCB silkscreen. |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; ties to output rail; reverse voltage applied here during off-state. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | 0.51V min @ 0.5A/25°C - Reduces conduction loss by >30% vs. comparable PN diodes, improving efficiency in battery-powered devices. |
| Guard ring construction | Enhanced transient immunity - Suppresses localized electric field crowding, enabling stable operation under 5.5A surge without parametric shift. |
| JEDEC-qualified reliability | AEC-Q200 alignment - Validated for high-reliability applications including industrial control and automotive infotainment power rails. |
| Halogen & antimony free | <900ppm Br, <900ppm Cl, <1000ppm Sb - Meets IEC 61249-2-21 "Green" standard for environmentally sensitive end equipment. |
Applications
| USB Power Delivery Adapter | IoT Sensor Node Power Supply |
|---|---|
Use Scenario: Secondary-side rectification in 5V/3A flyback converter for USB-C wall adapters. IC Role / Device Role / Timing Role: Output rectifier replacing synchronous MOSFET in cost-sensitive designs. Use Value: 0.51V VFM minimizes heat generation in sealed enclosures; SOD123 footprint allows dense PCB layout. | Use Scenario: Reverse polarity protection and supply rail clamping in battery-backed BLE sensor modules. IC Role / Device Role / Timing Role: Low-leakage blocking diode preventing battery drain during USB charging disconnect. Use Value: 10µA IRM at 20V/25°C ensures <1µA standby current; small size fits sub-10mm² board area. |
| Industrial PLC I/O Module | Automotive Cabin Controller |
Use Scenario: Input protection and signal-level translation in 24V digital input conditioning circuits. IC Role / Device Role / Timing Role: Clamp diode across optocoupler input to absorb inductive kickback from solenoid drivers. Use Value: Guard ring structure withstands repetitive 5.5A surges; -65°C to +150°C TJ range supports wide ambient operation. | Use Scenario: Auxiliary 5V rail rectification in HVAC control unit powered from vehicle battery. IC Role / Device Role / Timing Role: Primary rectifier in isolated DC-DC stage supplying microcontroller and CAN transceiver. Use Value: B0540WQ automotive variant available; same SOD123 footprint enables dual-sourcing strategy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB0540-E3/52 (Vishay) | Same 40V VRRM, 0.5A IF(AV), but higher VFM (0.55V min @ 0.5A) and larger SOD-123FL package outline. | Slightly higher thermal resistance (400°C/W) limits use in thermally constrained layouts. | Prefer when legacy Vishay footprint compatibility is required over lowest VFM. |
| SS14 (ON Semiconductor) | 40V VRRM, 1A IF(AV), but higher VFM (0.55V typ @ 1A) and 2x larger SMC package. | Higher current rating suits 1A designs but requires 3× PCB area; not drop-in for SOD123 footprints. | Select only if system demands >0.5A continuous current and board space permits SMC. |
Compared with SB0540-E3/52 and SS14, B0540W-7-F delivers the lowest forward voltage in SOD123 form factor, enabling tighter thermal margins in ultra-compact 5V power stages while maintaining JEDEC reliability validation.
Availability
B0540W-7-F is available at Aetrix Electronics and suitable for USB power delivery adapters, IoT sensor node power supplies, and industrial PLC I/O modules requiring stable component supply across production lifecycles.
Supply support for B0540W-7-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 and manufacturing operations across Asia and the Americas.
The B0540W belongs to Diodes' general-purpose Schottky rectifier product line, engineered for high-efficiency, low-voltage DC-DC conversion in consumer, industrial, and automotive power systems.
FAQ
What is the maximum junction temperature for B0540W-7-F?
The B0540W-7-F has an operating junction temperature range of –65°C to +150°C. This allows reliable operation in harsh environments such as automotive cabin controllers or industrial motor drives where ambient temperatures exceed 85°C. Derating curves in Figure 5 define safe current limits at elevated temperatures.
Is B0540W-7-F suitable for automotive applications?
The B0540W-7-F itself is not AEC-Q200 qualified, but its automotive-grade counterpart B0540WQ is explicitly qualified to AEC-Q200 standards and shares identical electrical specs and SOD123 packaging. For automotive designs, B0540WQ must be specified to meet qualification requirements.
How does the guard ring construction improve reliability?
Guard ring construction redistributes electric field lines at the silicon edge, preventing premature avalanche breakdown during voltage transients. In B0540W-7-F, this enables stable operation under 5.5A 8.3ms half-sine surges without parameter drift-critical for protecting downstream circuitry in unregulated input stages.
What is the recommended PCB pad layout for thermal performance?
Diodes recommends using the minimum pad layout specified for FR-4 PCBs (RθJA = 385°C/W), with X = 0.900mm, X1 = 4.050mm, Y = 0.950mm per their package outline document. Increasing copper area beyond minimum improves thermal dissipation but requires verification against solder joint reliability per J-STD-020.
B0540W-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 500mA
- Voltage - Forward (Vf) (Max) @ If:
- 510 mV @ 500 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 20 µA @ 40 V
- Capacitance @ Vr, F:
- 170pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
- Operating Temperature - Junction:
- -65°C ~ 150°C
B0540W-7-F FAQ
1.How can I place an order for B0540W-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for B0540W-7-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 B0540W-7-F reliable?
The price and inventory of B0540W-7-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B0540W-7-F is usually 5 days.
3.What payment methods are accepted for B0540W-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B0540W-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B0540W-7-F?
B0540W-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B0540W-7-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 B0540W-7-F?
For technical support, including B0540W-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B0540W-7-F requirements.
6.How does Aetrix verify that B0540W-7-F is sourced from the original manufacturer or authorized distributors?
All B0540W-7-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 B0540W-7-F meets industry standards.
7.What is the process for return or replacement of B0540W-7-F?
All B0540W-7-F units undergo pre-shipment inspection (PSI). If there is an issue with B0540W-7-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 B0540W-7-F part is unused and in its original packaging.
Return procedure for B0540W-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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