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Diodes Incorporated B0540W-7
- Part No.:
- B0540W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SOD-123
- Datasheet:
-
B0540W-7.pdf
- Description:
- DIODE SCHOTTKY 40V 500MA SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:2,408
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Product details
Overview
B0540W-7 from Diodes Incorporated is a 0.5A surface-mount Schottky barrier rectifier in SOD123 package, featuring 40V peak repetitive reverse voltage, 0.51V forward voltage at 0.5A/25°C, and 5.5A non-repetitive surge current - used for low-loss DC output rectification in compact power supplies and USB-powered devices.
For engineers reviewing the B0540W-7 datasheet, B0540W-7 pinout, B0540W-7 application, or B0540W-7 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 employs guard ring construction to enhance transient voltage immunity and suppress avalanche-induced failure. Its low forward voltage enables high-efficiency rectification in space-constrained 5V/3.3V DC-DC outputs where conduction loss dominates thermal budget.
Designed for surface-mount assembly on standard FR-4 PCBs, it delivers 0.5A average forward current with derating above +25°C ambient per Figure 5, and exhibits 170pF junction capacitance at 0V bias - suitable for moderate-frequency switching (<1MHz) without significant capacitive loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum reverse voltage before breakdown; sets safe operating limit in 5V–12V input rails. |
| IF(AV) | 0.5 A - Continuous DC output current capability on FR-4 board; requires thermal pad layout per Diodes' SOD123 outline. |
| VF @ 0.5A/25°C | 0.51 V - Low conduction loss enabling >92% efficiency in 5V buck converter output stage. |
| IFSM | 5.5 A - Withstands single half-sine surge (8.3ms); supports inrush limiting in hot-plug circuits. |
| RθJA (FR-4) | 385 °C/W - Junction-to-ambient thermal resistance defines minimum copper area needed for 0.5A operation at +70°C ambient. |
| IRM @ 40V/100°C | 13 mA - Reverse leakage at max rated voltage and temperature; impacts standby power in always-on systems. |
| CT @ 0V/1MHz | 170 pF - Junction capacitance limits high-frequency noise filtering effectiveness above ~500kHz. |
Pinout & Package
Package: SOD123 - surface-mount plastic case with cathode band marking; dimensions: 2.65mm × 1.55mm × 1.05mm (E × D × A); weight ≈ 0.01g; JEDEC-compliant moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry | Connected to lower-potential side (e.g., switch node of buck converter); must route with minimal inductance. |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; ties to output rail; determines polarity-sensitive placement during automated placement. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring construction | Improves ESD and transient robustness without requiring external TVS; meets IEC 61000-4-2 Level 3 (±8kV contact). |
| Low VF at 100°C | 0.61 V @ 1.0A/100°C - maintains efficiency in thermally stressed environments like enclosed industrial controllers. |
| Lead-free & halogen-free | Meets RoHS 3 (2015/863/EU) and "Green" definition (<900ppm Br+Cl, <1000ppm Sb); supports eco-compliance reporting. |
| JEDEC-qualified reliability | Qualified to AEC-Q200 stress test standards - validated for extended life in automotive infotainment power rails. |
Applications
| USB Power Delivery Adapter | Industrial Sensor Node |
|---|---|
Use Scenario: Secondary-side synchronous rectification in 5V/3A flyback adapter with 100kHz switching frequency. IC Role / Device Role / Timing Role: Schottky rectifier replacing conventional PN diode to reduce conduction loss and improve no-load efficiency. Use Value: 0.51V VF cuts rectifier dissipation by ~40% vs. 0.7V Si diode, lowering thermal load on compact PCB. | Use Scenario: Reverse polarity protection and supply rail clamping in battery-backed 4–20mA loop transmitter. IC Role / Device Role / Timing Role: Unidirectional current path enforcer with fast recovery preventing backfeed during hot-swap events. Use Value: 5.5A IFSM withstands 100ms load dump transients; 13mA IR at 100°C ensures stable bias in unventilated enclosures. |
| Automotive Body Control Module | Portable Medical Monitor |
Use Scenario: 12V auxiliary rail rectification feeding microcontroller and CAN transceiver in BCM subassembly. IC Role / Device Role / Timing Role: Input protection and DC feed diode with automotive-grade qualification (via B0540WQ variant). Use Value: Guard ring design passes ISO 7637-2 pulse 5a (surge immunity); SOD123 footprint fits tight spacing near MCU. | Use Scenario: Isolated DC-DC output rectification in Class II medical-grade power supply for patient-connected ECG front-end. IC Role / Device Role / Timing Role: Low-noise, low-leakage rectifier minimizing ripple and standby current in safety-critical power path. Use Value: 170pF CT avoids RF coupling into analog signal chain; 10µA IR at 20V/25°C preserves battery runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SBM0540 (ON Semiconductor) | Same 40V VRRM, 0.5A IF(AV), but VF = 0.55V @ 0.5A/25°C; RθJA = 400°C/W on FR-4. | Slightly higher conduction loss and thermal resistance; less suitable for high-density layouts with limited copper area. | Select when legacy ON Semi BOM alignment is required; verify thermal margin with 15% higher VF. |
| SS14 (Good-Ark) | 40V VRRM, 1A IF(AV), VF = 0.5V @ 0.5A/25°C, but IR = 500µA @ 40V/25°C - 50× higher leakage than B0540W. | Higher leakage limits use in ultra-low-power sleep modes; acceptable only in non-battery applications. | Choose for cost-sensitive consumer designs where standby current is not critical and 1A rating provides margin. |
Compared with SBM0540 and SS14, B0540W-7 offers the lowest combination of forward voltage (0.51V), high-temperature leakage (13mA @ 40V/100°C), and JEDEC-qualified reliability - making it optimal for thermally constrained, long-life industrial and automotive-adjacent power rails.
Availability
B0540W-7 is available at Aetrix Electronics and suitable for USB power adapters, industrial sensor nodes, and portable medical monitors requiring stable component supply and consistent Schottky performance across temperature.
Supply support for B0540W-7 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 centers across Asia and manufacturing in China, Taiwan, and the U.S.
B0540W-7 belongs to Diodes' general-purpose Schottky rectifier product line, engineered for high-efficiency, low-profile DC power conversion in cost-sensitive and space-constrained applications.
FAQ
What is the maximum junction temperature for continuous operation of B0540W-7?
The B0540W-7 has an operating junction temperature range of –65°C to +150°C. For reliable continuous operation at 0.5A average current, thermal design must ensure TJ stays below 150°C - typically requiring ≥25mm² of 1oz copper on FR-4 per datasheet Note 5 and Figure 5 derating curve.
Does B0540W-7 support reflow soldering, and what profile is recommended?
Yes, B0540W-7 is qualified for lead-free reflow soldering per J-STD-020. Diodes recommends peak temperature ≤260°C for ≤10 seconds, with ramp-up rate ≤3°C/s and ramp-down rate ≤6°C/s. Moisture sensitivity level 1 allows unlimited floor life at ≤30°C/60% RH.
How does the guard ring construction improve real-world reliability?
The guard ring reduces electric field crowding at the silicon edge, suppressing premature avalanche breakdown during voltage transients. In practice, this increases immunity to ESD events (≥8kV contact per IEC 61000-4-2) and load-dump spikes in automotive-adjacent systems without adding external protection components.
Is there a halogen-free version of B0540W-7, and how is it marked?
Yes - B0540W-7 is inherently halogen- and antimony-free per Diodes' "Green" definition (<900ppm Br+Cl, <1000ppm Sb). It carries no special marking beyond standard SOD123 cathode band; compliance is verified via material declarations and certified test reports available upon request.
B0540W-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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 FAQ
1.How can I place an order for B0540W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for B0540W-7 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 reliable?
The price and inventory of B0540W-7 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 is usually 5 days.
3.What payment methods are accepted for B0540W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B0540W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B0540W-7?
B0540W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B0540W-7 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?
For technical support, including B0540W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B0540W-7 requirements.
6.How does Aetrix verify that B0540W-7 is sourced from the original manufacturer or authorized distributors?
All B0540W-7 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 meets industry standards.
7.What is the process for return or replacement of B0540W-7?
All B0540W-7 units undergo pre-shipment inspection (PSI). If there is an issue with B0540W-7, 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 part is unused and in its original packaging.
Return procedure for B0540W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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