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Diodes Incorporated B0540WSQ-7
- Part No.:
- B0540WSQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
B0540WSQ-7.pdf
- Description:
- SCHOTTKY RECTIFIER SOD323 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:7,262
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Product details
Overview
B0540WSQ-7 from Diodes Incorporated is a surface-mount Schottky barrier rectifier optimized for low-loss DC/DC conversion and reverse polarity protection in space-constrained automotive and portable electronics. It delivers 40 V peak repetitive reverse voltage, 0.5 A average rectified output current, and forward voltage as low as 285 mV at 10 mA - enabling high-efficiency 3.3 V and 5 V rail clamping and OR-ing applications.
For engineers reviewing the B0540WSQ-7 datasheet, B0540WSQ-7 pinout, B0540WSQ-7 application, or B0540WSQ-7 equivalent, key selection criteria include its AEC-Q101 qualification, SOD323 package thermal resistance (270 °C/W with copper pad), and guaranteed 1 µA reverse leakage at 10 V - critical for battery-powered systems requiring ultra-low standby loss.
Technical Context
This Schottky diode uses guard ring construction to suppress transient-induced avalanche breakdown and sustain reliable operation under load dump or ESD events. Its low junction capacitance (125 pF at 0 V) and fast recovery behavior support high-frequency switching in buck converter freewheeling paths and USB power switches.
The device operates across –55 °C to +150 °C with full specification compliance, leveraging matte tin-plated leads and halogen-free molding compound (UL 94V-0). Thermal performance is validated under two PCB conditions: 350 °C/W on standard FR-4 and 270 °C/W with 1-inch² 2 oz copper pad - directly informing layout-driven derating decisions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Withstands 40 V repetitive reverse voltage without breakdown; suitable for 24 V automotive systems with margin. |
| IO | 0.5 A - Continuous DC current handling at TA = 25 °C; derates to ~0.25 A at 125 °C ambient per Figure 4. |
| VF @ 10 mA | 285 mV max - Enables <100 mW conduction loss at 10 mA; critical for always-on sensor node power rails. |
| IR @ 10 V | 1.0 µA max - Ultra-low leakage preserves battery life in >1-year standby applications. |
| RθJA | 270 °C/W - Achievable with 1-inch² 2 oz copper pad; enables 0.5 A operation up to 85 °C ambient without heatsink. |
| CT @ 0 V | 125 pF - Limits high-frequency noise coupling in USB 2.0 data line protection circuits. |
| AEC-Q101 | Qualified - Validated for automotive use including temperature cycling, HTRB, and ESD per AEC stress test plan. |
Pinout & Package
Package: SOD323 - ultra-compact 1.3 mm × 1.7 mm surface-mount plastic package with cathode band marking; weight 0.004 g; moisture sensitivity level 1 (J-STD-020).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input/source side in reverse polarity protection; ties to switch node in synchronous rectifier emulation. |
| Cathode | Forward current exit / reverse blocking terminal | Connected to load/rail side; cathode band visible on top view identifies polarity for automated optical inspection (AOI) and placement. |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring construction | Suppresses edge breakdown during transients; extends surge survivability beyond IFSM rating in real-world load-dump events. |
| Low VF at low IF | 285 mV max at 10 mA enables efficient biasing of PMIC enable pins and microcontroller reset circuits without voltage droop. |
| AEC-Q101 qualification | Validated for automotive underhood environments including 1000-hr HTOL, 1000-cycle temperature cycling, and ±8 kV HBM ESD. |
| Halogen & antimony free | Meets JEDEC JS709E "Green" definition (<900 ppm Br, <900 ppm Cl, <1000 ppm Sb); supports RoHS 3 and ELV compliance. |
Applications
| Automotive Body Control Module (BCM) | USB-C Power Delivery Input Protection |
|---|---|
Use Scenario: Reverse battery connection protection in 12 V BCM power inputs subjected to jump-start transients. IC Role / Device Role / Timing Role: Unidirectional blocking diode placed between battery terminal and system regulator input. Use Value: 40 V VRRM withstands ISO 7637-2 Pulse 5a (load dump up to 35 V), while 1 µA IR minimizes quiescent drain on vehicle battery. |
Use Scenario: Input OR-ing diode in dual-source USB-C PD adapter to prevent backfeed between primary and backup supplies. IC Role / Device Role / Timing Role: Low-VF Schottky placed in series with VBUS path to enforce unidirectional current flow. Use Value: 285 mV VF at 10 mA reduces voltage drop below USB PD 3.0 minimum VBUS regulation threshold (4.75 V), preserving handshake reliability. |
| Industrial IoT Sensor Node | Medical Wearable Charging Circuit |
Use Scenario: Polarity protection for coin-cell–powered environmental sensors operating at –40 °C to +85 °C. IC Role / Device Role / Timing Role: Series-connected Schottky on main power rail to block reverse current during battery replacement. Use Value: Guaranteed operation down to –55 °C and 1 µA IR at 10 V ensure >5-year shelf life with CR2032 cells. |
Use Scenario: Isolation diode in linear charger path to decouple battery from charging IC when USB is disconnected. IC Role / Device Role / Timing Role: Forward-biased Schottky conducting charge current; reverse-biased during battery-only operation. Use Value: 125 pF CT avoids interference with charger IC's internal sensing loop; SOD323 footprint fits tight wearable PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB0540S-TP (Micro Commercial) | Same 40 V VRRM, 0.5 A IO, but VF = 450 mV max at 500 mA; no AEC-Q101 qualification. | Not approved for automotive; suitable only for consumer-grade power supplies with relaxed reliability requirements. | Select only if cost sensitivity outweighs automotive qualification and low-VF requirement. |
| NSR0540HT1G (onsemi) | Identical 40 V/0.5 A rating, VF = 310 mV max at 10 mA, AEC-Q101 qualified, but RθJA = 300 °C/W (FR-4). | Higher thermal resistance limits continuous current in compact PCBs without copper pour. | Prefer when existing layout lacks large copper area but requires same automotive qualification. |
Compared with SB0540S-TP and NSR0540HT1G, B0540WSQ-7 uniquely combines AEC-Q101 qualification, lowest VF at light loads (285 mV), and best thermal resistance (270 °C/W) - making it optimal for thermally constrained automotive and battery-critical designs.
Availability
B0540WSQ-7 is available at Aetrix Electronics and suitable for automotive body control modules, USB-C power delivery protection circuits, industrial IoT sensor nodes, and medical wearable charging systems requiring stable component supply and long-term lifecycle assurance.
Supply support for B0540WSQ-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, manufacturing, and sales operations across Asia, Europe, and North America.
B0540WSQ-7 belongs to Diodes' automotive-qualified Schottky rectifier product line, engineered specifically for reverse polarity protection and low-loss DC/DC efficiency in harsh-environment applications where reliability, low leakage, and thermal robustness are mandatory.
FAQ
Is B0540WSQ-7 suitable for 24 V automotive systems?
Yes. Its 40 V peak repetitive reverse voltage provides 16 V margin above nominal 24 V systems and withstands ISO 7637-2 Pulse 5a load dump transients up to 35 V. AEC-Q101 qualification confirms suitability for underhood environments including temperature cycling and humidity testing.
What is the maximum continuous current at 85 °C ambient?
Per Figure 4, the derated average rectified output current is approximately 0.35 A at 85 °C ambient when mounted on a 1-inch² 2 oz copper pad (RθJA = 270 °C/W). At 125 °C ambient, it drops to ~0.22 A - consistent with thermal limit calculations.
Does B0540WSQ-7 have a specified junction-to-case thermal resistance?
No. The datasheet specifies only junction-to-ambient thermal resistance (RθJA) under two PCB conditions: 350 °C/W on standard FR-4 and 270 °C/W with 1-inch² 2 oz copper pad. Junction-to-case (RθJC) is not published, so heatsink attachment is not supported in this package.
Can B0540WSQ-7 replace BAT54-type diodes in high-speed signal clamping?
No. Though both are SOD323 Schottkys, B0540WSQ-7 is rated for 0.5 A power rectification with higher capacitance (125 pF) and slower dynamic response than BAT54 (typically <10 pF). It is unsuitable for RF or high-speed digital clamping; use BAT54SW or similar signal Schottkys instead.
B0540WSQ-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- 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:
- 550 mV @ 500 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 5 µA @ 30 V
- Capacitance @ Vr, F:
- 125pF @ 0V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
- Operating Temperature - Junction:
- -55°C ~ 150°C
B0540WSQ-7 FAQ
1.How can I place an order for B0540WSQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for B0540WSQ-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 B0540WSQ-7 reliable?
The price and inventory of B0540WSQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B0540WSQ-7 is usually 5 days.
3.What payment methods are accepted for B0540WSQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B0540WSQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B0540WSQ-7?
B0540WSQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B0540WSQ-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 B0540WSQ-7?
For technical support, including B0540WSQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B0540WSQ-7 requirements.
6.How does Aetrix verify that B0540WSQ-7 is sourced from the original manufacturer or authorized distributors?
All B0540WSQ-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 B0540WSQ-7 meets industry standards.
7.What is the process for return or replacement of B0540WSQ-7?
All B0540WSQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with B0540WSQ-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 B0540WSQ-7 part is unused and in its original packaging.
Return procedure for B0540WSQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
B0540WSQ-7 Tags
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Diodes Incorporated
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