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Diodes Incorporated B0520LW-7
- Part No.:
- B0520LW-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SOD-123
- Datasheet:
-
B0520LW-7.pdf
- Description:
- DIODE SCHOTTKY 20V 500MA SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:8,017
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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 repetitive reverse voltage, 0.385V max forward voltage at 0.5A/25°C, and 244°C/W thermal resistance. It delivers low-loss DC power conversion in space-constrained DC-DC outputs and USB power rails.
For engineers reviewing the B0520LW datasheet, B0520LW pinout, B0520LW application, or B0520LW equivalent, key selection criteria include forward voltage at rated current, thermal derating behavior, reverse leakage at elevated temperature, and AEC-Q101 qualification status for automotive-grade reliability validation.
Technical Context
This Schottky diode uses guard ring construction to suppress transient-induced junction breakdown and supports continuous 0.5A average rectified output under standard FR-4 PCB mounting conditions. Its 170pF typical junction capacitance at 0V bias enables fast switching in low-voltage, high-frequency rectification paths.
The device operates across –65°C to +125°C with 5.5A non-repetitive surge capability (8.3ms half-sine), and exhibits 75µA max reverse leakage at 10V/25°C-critical for standby power integrity in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum reverse voltage before breakdown; defines safe blocking range in 3.3V–5V supply rails |
| IF(AV) | 0.5 A - Continuous DC output current capacity; sets upper limit for compact buck converter freewheeling paths |
| VFM @ 0.5A/25°C | 0.385 V - Forward drop determining conduction loss; yields ~193mW dissipation at full load |
| RθJA | 244 °C/W - Junction-to-ambient thermal resistance on standard 2"×2" FR-4 board; governs temperature rise under load |
| IRM @ 20V/25°C | 250 µA - Max reverse leakage; impacts quiescent current in always-on circuits like real-time clocks |
| CT @ 0V | 170 pF - Junction capacitance at zero bias; limits high-frequency noise coupling and switching speed |
| IFSM | 5.5 A - Surge rating for inrush or fault events; supports robustness against capacitor charging transients |
Pinout & Package
Package: SOD-123 - Surface-mount plastic case (UL 94V-0), 0.01g weight, cathode band polarity marking, matte tin-plated terminals solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to lower-potential side of circuit (e.g., switch node in buck topology) |
| Cathode | Current exit point during forward conduction; marked with band | Connected to output rail or filter capacitor; determines output polarity and grounding reference |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | 0.385V max at 0.5A/25°C - reduces conduction loss by >40% vs. standard silicon diodes in 5V systems |
| Guard ring construction | Enhanced transient immunity - prevents localized avalanche failure during ESD or load dump events |
| AEC-Q101 qualified (B0520LWQ variant) | Validated for automotive electronics - supports use in infotainment power supplies and body control modules |
| Halogen & antimony free | <900ppm Br, <900ppm Cl, <1000ppm Sb - meets global "Green" compliance for RoHS 3 and IATF 16949 manufacturing |
| Moisture sensitivity Level 1 | No floor life limitation - eliminates bake requirements prior to reflow, simplifying SMT assembly |
Applications
| USB Power Delivery Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Reverse polarity protection and OR-ing in dual-input 5V USB PD power paths. IC Role / Device Role / Timing Role: Schottky rectifier providing low-loss, fast-turn-off isolation between input sources. Use Value: 0.385V VFM minimizes voltage drop across protection path, preserving ≥4.6V at load under 0.5A. | Use Scenario: Output rectification in 12V-to-5V buck converter supplying microcontroller and CAN transceiver. IC Role / Device Role / Timing Role: Freewheeling diode handling inductive energy recovery during high-side switch off-time. Use Value: 244°C/W RθJA enables stable operation at 85°C ambient without heatsinking in sealed ECUs. |
| IoT Sensor Node Power Rail | Industrial PLC Digital Input Protection |
Use Scenario: Low-quiescent-power rectification in coin-cell–supplied BLE sensor nodes with 3.3V LDO input. IC Role / Device Role / Timing Role: Primary DC-DC output rectifier enabling >90% efficiency at light loads. Use Value: 75µA IRM at 10V/25°C ensures <1µW reverse leakage, extending battery life beyond 5 years. | Use Scenario: Transient suppression and DC blocking in 24V digital input channels with optocoupler interface. IC Role / Device Role / Timing Role: Bidirectional clamping diode absorbing inductive kickback from solenoid drivers. Use Value: Guard ring construction withstands 5.5A surge without degradation, meeting IEC 61000-4-4 level 4 immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MBR0520L (ON Semiconductor) | Same 20V VRRM, 0.5A IF, but 0.45V VFM @ 0.5A - 17% higher conduction loss | Lacks AEC-Q101 qualification; not approved for automotive production | Select when cost sensitivity outweighs thermal performance and automotive compliance |
| SS0520 (Good-Ark) | Identical VRRM and IF ratings; 0.39V VFM @ 0.5A - near-equivalent forward performance | No published AEC-Q101 data; moisture sensitivity Level 1 confirmed | Acceptable for industrial/commercial designs where automotive qualification is not required |
Compared with MBR0520L and SS0520, the B0520LW offers the lowest verified forward voltage in its class and unique AEC-Q101 qualification-making it the preferred choice for thermally constrained automotive and high-reliability embedded power rails.
Availability
B0520LW is available at Aetrix Electronics and suitable for USB power delivery interfaces, automotive body control modules, IoT sensor node power rails, and industrial PLC digital input protection requiring stable component supply and traceable sourcing.
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' 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 continuous operation of the B0520LW?
The B0520LW has an operating junction temperature range of –65°C to +125°C. Under continuous 0.5A load on a standard FR-4 PCB (2" × 2", 2oz copper), junction temperature remains within spec up to 85°C ambient-verified by thermal derating curve Fig. 4 in DS30051 Rev. 19-2.
Is the B0520LW suitable for automotive applications?
The B0520LW itself is not AEC-Q101 qualified; however, its automotive-grade variant B0520LWQ is fully AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities-making it suitable for production automotive electronics including body control and infotainment systems.
How does the guard ring construction improve reliability?
The guard ring structure surrounds the active junction to distribute electric field stress during voltage transients, preventing localized avalanche breakdown. This extends device lifetime under repetitive ESD or load-dump events-confirmed by Diodes' transient immunity testing per AEC-Q101 stress requirements.
What is the recommended PCB pad layout for optimal thermal performance?
Diodes specifies a suggested SOD-123 pad layout with cathode pad dimensions of 0.75" × 1.0" and anode pad dimensions of 0.25" × 1.0" on 2oz copper. Adhering to these dimensions achieves the rated 244°C/W RθJA; reducing cathode pad area increases thermal resistance disproportionately due to dominant heat flow through the cathode terminal.
B0520LW-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):
- 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 FAQ
1.How can I place an order for B0520LW-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for B0520LW-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 B0520LW-7 reliable?
The price and inventory of B0520LW-7 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 is usually 5 days.
3.What payment methods are accepted for B0520LW-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B0520LW-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B0520LW-7?
B0520LW-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B0520LW-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 B0520LW-7?
For technical support, including B0520LW-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B0520LW-7 requirements.
6.How does Aetrix verify that B0520LW-7 is sourced from the original manufacturer or authorized distributors?
All B0520LW-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 B0520LW-7 meets industry standards.
7.What is the process for return or replacement of B0520LW-7?
All B0520LW-7 units undergo pre-shipment inspection (PSI). If there is an issue with B0520LW-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 B0520LW-7 part is unused and in its original packaging.
Return procedure for B0520LW-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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