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Diodes Incorporated B0520LW-7-F
- Part No.:
- B0520LW-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SOD-123
- Datasheet:
-
B0520LW-7-F.pdf
- Description:
- DIODE SCHOTTKY 20V 500MA SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:134,836
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Product details
Overview
B0520LW from Diodes Incorporated is a 0.5A surface-mount Schottky barrier rectifier in SOD-123 package, featuring 20V peak reverse voltage, 0.385V forward voltage at 0.5A/25°C, and 5.5A non-repetitive surge current - optimized for low-loss DC/DC output rectification in space-constrained power supplies.
For engineers reviewing the B0520LW datasheet, B0520LW pinout, B0520LW application, or B0520LW equivalent, key selection criteria include forward voltage drop at rated current, thermal resistance (244°C/W), leakage current at 20V/100°C (8.0mA), junction temperature range (–65°C to +125°C), and AEC-Q101 qualification status for automotive-grade reliability.
Technical Context
This Schottky diode uses guard ring construction to suppress transient-induced avalanche failure and achieves high conductance via low-series-resistance metal-semiconductor junction design. Its 170pF junction capacitance at 0V enables fast switching in high-frequency buck converter outputs.
Thermal performance is defined for FR-4 PCB mounting with specified pad dimensions: cathode pad 0.75" × 1.0", anode pad 0.25" × 1.0". Derating begins above 25°C ambient, with 0.5A average current limited to ≤75°C lead temperature per Fig. 4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum repetitive reverse voltage before breakdown; sets upper limit for DC blocking in 12V rail clamping or 5V output rectification. |
| VFM @ 0.5A, 25°C | 0.385 V - Forward drop at full rated current; directly determines conduction loss (0.1925W) and thermal load in continuous operation. |
| IFSM | 5.5 A - Non-repetitive surge rating for 8.3ms half-sine; supports inrush current handling during power-up in SMPS outputs. |
| RθJA | 244 °C/W - Junction-to-ambient thermal resistance on standard FR-4 board; defines temperature rise per watt dissipated (e.g., 100°C rise at 410mW). |
| CT @ 0V, 1MHz | 170 pF - Junction capacitance; impacts switching speed and EMI in high-frequency converters (>500kHz) due to reverse recovery charge minimization. |
| TJ Range | –65°C to +125°C - Operating junction temperature span; enables deployment in under-hood automotive modules and industrial power adapters. |
Pinout & Package
Package: SOD-123 - Surface-mount plastic case (UL 94V-0), 0.01g weight, cathode band polarity marking, matte tin-plated leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal | Connected to lower-potential node (e.g., switch node in synchronous buck); requires minimal copper area (0.25" × 1.0") for thermal management. |
| Cathode | Current exit terminal | Connected to output rail; larger pad (0.75" × 1.0") required to dissipate heat and reduce thermal resistance by ~30% vs. standard layout. |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage | VFM = 0.385V @ 0.5A/25°C - Reduces conduction loss by ≥25% vs. comparable 1N5819 (0.45V), improving efficiency in 3.3V/5V point-of-load converters. |
| Guard ring protection | Integrated edge termination - Suppresses localized electric field crowding during voltage transients, enabling reliable operation in noisy automotive environments. |
| AEC-Q101 qualified | B0520LWQ variant only - Validated for automotive applications including body control modules and infotainment power rails with PPAP documentation support. |
| Halogen & antimony free | <900ppm Br, <900ppm Cl, <1000ppm Sb - Meets IPC-4101D and JEDEC J-STD-709C green material requirements for RoHS 3 compliance. |
Applications
| USB Power Delivery Adapter | Automotive LED Headlamp Driver |
|---|---|
|
Use Scenario: Output rectification in 5V/9V/15V/20V multi-tap flyback converter supplying USB-C PD sink ports. IC Role / Device Role: Low-VF Schottky rectifier replacing conventional PN diodes to minimize conduction loss and thermal stress at 0.5A load. Use Value: Enables >92% efficiency at 20V/0.5A output while maintaining <60°C case temperature on compact 2-layer PCBs. |
Use Scenario: Freewheeling path in constant-current LED driver IC controlling high-brightness headlamp arrays. IC Role / Device Role: Fast-recovery freewheel diode across inductive LED string, minimizing voltage spikes during PWM dimming transitions. Use Value: 170pF capacitance and <8.0mA leakage at 20V/100°C ensure stable current regulation and reduced EMI in 200Hz–2kHz PWM dimming. |
| Industrial IoT Sensor Node | Medical Portable Battery Charger |
|
Use Scenario: Reverse-polarity protection and input rectification in ultra-low-power 3.3V supply derived from coin-cell or energy-harvesting sources. IC Role / Device Role: Low-leakage (75µA @ 10V/25°C) Schottky diode preventing battery drain while enabling bidirectional energy flow in harvesting circuits. Use Value: Sub-100µA IR at room temperature extends shelf life of sealed sensor nodes beyond 10 years without maintenance. |
Use Scenario: Output rectification in isolated 5V/2A flyback charger for Li-ion packs in portable diagnostic devices. IC Role / Device Role: Secondary-side rectifier operating at 100kHz switching frequency with minimal stored charge to reduce switching losses. Use Value: 0.330V VFM @ 0.5A/100°C maintains tight output regulation across –20°C to +60°C ambient, critical for medical battery safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SBM0520T1G (ON Semiconductor) | Same SOD-123 package, 0.5A/20V rating, but VFM = 0.45V @ 0.5A/25°C; RθJA = 260°C/W. | Higher conduction loss and thermal resistance limit use in thermally constrained 5V/0.5A outputs above 50°C ambient. | Select when legacy ON Semi sourcing is required and efficiency loss <0.5% is acceptable. |
| SS12 (Micro Commercial Components) | SOD-123, 1A/20V rating, VFM = 0.5V @ 1A/25°C; no AEC-Q101 variant; IR = 200µA @ 20V/25°C. | Higher leakage and no automotive qualification restrict use to consumer-grade AC/DC adapters and non-safety-critical systems. | Select only for cost-sensitive, non-automotive applications where 1A margin is needed and thermal headroom exceeds 40°C. |
Compared with SBM0520T1G and SS12, B0520LW delivers lowest forward voltage and best thermal resistance among SOD-123 20V Schottkys, making it optimal for high-efficiency, thermally dense, or automotive-qualified designs - especially where leakage <100µA and surge robustness >5A are mandatory.
Availability
B0520LW is available at Aetrix Electronics and suitable for USB Power Delivery adapters, automotive LED drivers, industrial IoT sensor nodes, and medical portable battery chargers requiring stable component supply and long-term lifecycle assurance.
Supply support for B0520LW 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 B0520LW belongs to Diodes' high-reliability Schottky rectifier product line, engineered specifically for efficiency-critical, space-constrained DC/DC conversion in automotive, industrial, and medical power systems.
FAQ
Is B0520LW suitable for automotive applications?
No - only the B0520LWQ variant is AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. The B0520LW lacks automotive change control documentation and qualification testing; use B0520LWQ for body control modules, infotainment, or lighting systems requiring automotive compliance.
What is the maximum allowable PCB pad size for thermal performance?
For optimal thermal resistance (244°C/W), the cathode pad must be 0.75" × 1.0" and the anode pad 0.25" × 1.0" on 2 oz. copper FR-4. Increasing cathode pad area beyond 0.75" reduces RθJA by ~15% per 0.25" increment, but violates JEDEC MO-203-1 standard for SOD-123 reflow compatibility.
How does leakage current change at elevated temperature?
IRM increases significantly with temperature: 250µA at 20V/25°C rises to 8.0mA at 20V/100°C. This 32× increase must be accounted for in high-temperature reverse-biased applications such as battery backup diode OR-ing, where leakage could discharge standby cells within hours.
Can B0520LW replace 1N5819 in existing designs?
Yes - B0520LW matches 1N5819's 20V/1A rating in footprint (SOD-123 vs. DO-27), but its 0.5A average current rating is half that of 1N5819 (1A). It is a direct replacement only if peak current stays ≤0.5A and thermal design accommodates higher VFM-related losses at 100°C junction.
B0520LW-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):
- 20 V
- Current - Average Rectified (Io):
- 500mA
- Voltage - Forward (Vf) (Max) @ If:
- 385 mV @ 500 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 250 µA @ 20 V
- Capacitance @ Vr, F:
- 170pF @ 0V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
- Operating Temperature - Junction:
- -65°C ~ 125°C
B0520LW-7-F FAQ
1.How can I place an order for B0520LW-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for B0520LW-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 B0520LW-7-F reliable?
The price and inventory of B0520LW-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 B0520LW-7-F is usually 5 days.
3.What payment methods are accepted for B0520LW-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B0520LW-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B0520LW-7-F?
B0520LW-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B0520LW-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 B0520LW-7-F?
For technical support, including B0520LW-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B0520LW-7-F requirements.
6.How does Aetrix verify that B0520LW-7-F is sourced from the original manufacturer or authorized distributors?
All B0520LW-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 B0520LW-7-F meets industry standards.
7.What is the process for return or replacement of B0520LW-7-F?
All B0520LW-7-F units undergo pre-shipment inspection (PSI). If there is an issue with B0520LW-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 B0520LW-7-F part is unused and in its original packaging.
Return procedure for B0520LW-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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