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Diodes Incorporated B140WSQ-7
- Part No.:
- B140WSQ-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
B140WSQ-7.pdf
- Description:
- SCHOTTKY RECTIFIER SOD323 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:6,069
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Product details
Overview
B140WSQ-7 from Diodes Incorporated is a surface-mount Schottky barrier rectifier rated for 40 V peak repetitive reverse voltage, 1 A average rectified output current, and 0.56 V typical forward voltage at 1 A. It features guard ring construction for transient protection and is AEC-Q101 qualified for automotive power conversion and DC/DC converter applications.
For engineers reviewing the B140WSQ-7 datasheet, B140WSQ-7 pinout, B140WSQ-7 application, or B140WSQ-7 equivalent, this device is selected for low-loss, high-conductance rectification in space-constrained automotive and industrial power supplies where thermal resistance (270 °C/W on 1-inch² copper pad) and low IR leakage (<50 µA at 40 V) are critical.
Technical Context
This Schottky diode operates with minimal forward conduction loss due to its low VF (0.56 V typ. @ 1 A) and high conductance, enabling efficient power delivery in low-voltage DC/DC stages. Its guard ring structure enhances ruggedness against voltage transients common in automotive load-dump environments.
Thermal performance is defined by two RθJA values: 350 °C/W on standard FR-4 PCB and 270 °C/W with enhanced copper pad layout-directly informing heatsinking requirements. Junction temperature range spans –55 °C to +150 °C, supporting operation in under-hood automotive locations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Reverse Voltage | 40 V - maximum blocking capability without breakdown during transient spikes |
| Forward Voltage | 0.56 V (typ.) @ 1 A - enables <0.56 W conduction loss per diode in 1 A paths |
| Avg. Rectified Current | 1 A - continuous DC output current rating at TA ≤ 75 °C (derated above) |
| Surge Current | 3 A (8.3 ms half-sine) - withstands brief inrush or fault currents in power rails |
| Reverse Leakage | 5.0 µA (typ.) @ 40 V - minimizes standby power loss in always-on systems |
| Junction Capacitance | 125 pF @ 0 V - impacts high-frequency switching noise and EMI in SMPS designs |
| Thermal Resistance | 270 °C/W (1″² Cu pad) - defines max power dissipation before exceeding 150 °C junction |
Pinout & Package
Package: SOD323 - ultra-compact surface-mount plastic package (1.30 × 1.70 × 0.95 mm), cathode-banded polarity, matte tin-plated terminals, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal | Connected to input/source side of rectifier path; must be routed with low-inductance trace |
| Cathode | Current exit terminal | Marked with band; connects to output/load side; determines DC polarity of rectified output |
Key Features
| Feature | Design Value |
|---|---|
| Low forward voltage drop | 0.56 V typ. @ 1 A reduces conduction loss and improves efficiency in 3.3–12 V power rails |
| Guard ring construction | Enhances surge robustness and prevents edge breakdown during fast transients (e.g., ISO 7637-2 pulses) |
| AEC-Q101 qualification | Validated for automotive use including PPAP submission and IATF 16949 manufacturing control |
| Halogen & antimony free | Meets "Green" definition: Br+Cl <1500 ppm, Sb <1000 ppm - supports eco-compliance programs |
Applications
| Automotive Body Control Module | Industrial DC/DC Converter |
|---|---|
Use Scenario: Reverse polarity protection and flyback suppression in 12 V battery-fed BCM sub-circuits. IC Role / Device Role / Timing Role: Schottky rectifier providing low-loss unidirectional current path and clamping. Use Value: 0.56 V VF limits heat generation in confined BCM enclosures; AEC-Q101 ensures reliability across –40 °C to +125 °C ambient. |
Use Scenario: Output rectification in isolated 5 V/1 A flyback converter powering PLC I/O modules. IC Role / Device Role / Timing Role: Primary output-side rectifier converting transformer secondary AC to regulated DC. Use Value: 125 pF junction capacitance minimizes switching node ringing; 1 A rating matches typical module load current. |
| USB-C Power Delivery Sink | Smart Meter Power Supply |
Use Scenario: Input protection and OR-ing in dual-input (battery + adapter) USB-C PD sink power path. IC Role / Device Role / Timing Role: Low-VF Schottky enabling efficient power source selection with minimal dropout. Use Value: 0.56 V VF preserves >95% input voltage margin for downstream buck regulators; SOD323 footprint saves board area. |
Use Scenario: Auxiliary supply rectification in single-phase smart meters operating from 230 VAC mains via capacitive dropper. IC Role / Device Role / Timing Role: Half-wave rectifier generating bias voltage for microcontroller and RTC circuitry. Use Value: 40 V VRRM safely handles peak rectified voltage (~325 V) with derating; 5 µA IR prevents capacitor discharge in sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SB140-E3/5BT (Vishay) | Same 40 V / 1 A rating; VF = 0.55 V typ.; SOD-123 package (larger, higher RθJA) | SOD-123 requires more PCB area; less suitable for ultra-dense automotive layouts | Select when legacy SOD-123 footprint compatibility is required over size optimization |
| SS14 (ON Semiconductor) | 40 V / 1 A; VF = 0.5 V typ.; SMC package (higher thermal mass, lower RθJA ≈ 120 °C/W) | SMC supports higher continuous current but occupies ~3× PCB area vs. SOD323 | Prefer for industrial converters needing >1 A derated current or improved thermal headroom |
Compared with SB140-E3/5BT and SS14, the B140WSQ-7 delivers identical electrical ratings in the smallest footprint (SOD323), making it optimal for space-constrained automotive modules where thermal design leverages copper pad enhancement rather than package size.
Availability
B140WSQ-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial DC/DC converters, and smart meter auxiliary power supplies requiring stable component supply and AEC-Q101 compliance.
Supply support for B140WSQ-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 worldwide.
The B140WSQ-7 belongs to Diodes' AEC-Q101-qualified Schottky rectifier product line, engineered specifically for high-reliability automotive power management and industrial power conversion where low VF, compact packaging, and transient robustness are essential.
FAQ
Is B140WSQ-7 suitable for reverse polarity protection in 12 V automotive systems?
Yes. With 40 V VRRM and AEC-Q101 qualification, the B140WSQ-7 reliably blocks reverse battery connection in 12 V systems while maintaining low 0.56 V forward drop. Its guard ring construction provides added immunity to load-dump transients up to ISO 7637-2 Pulse 5a, making it appropriate for BCM and infotainment power inputs.
What is the maximum ambient temperature for 1 A continuous operation?
Per Figure 4 in the datasheet, the B140WSQ-7 supports 1 A average rectified current up to 75 °C ambient temperature when mounted on a 1-inch² copper pad (RθJA = 270 °C/W). Above 75 °C, current must be linearly derated to zero at 150 °C ambient to maintain TJ ≤ 150 °C.
Does B140WSQ-7 have a specified junction-to-case thermal resistance?
No. The datasheet specifies only junction-to-ambient thermal resistance (RθJA = 270 °C/W on 1-inch² Cu pad and 350 °C/W on FR-4), with no RθJC value provided. Thermal design must therefore rely on PCB copper area and airflow modeling rather than case-mounted heatsink approaches.
Can B140WSQ-7 replace a standard silicon rectifier like 1N4001 in low-voltage circuits?
Yes, with significant efficiency gains: at 1 A, B140WSQ-7's 0.56 V VF cuts conduction loss by ~60% versus 1N4001's ~0.95 V VF. However, its 40 V VRRM is lower than 1N4001's 50 V, so verify reverse voltage margin. Also note its higher reverse leakage (µA vs. nA), which may matter in ultra-low-power sleep modes.
B140WSQ-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):
- 1A
- Voltage - Forward (Vf) (Max) @ If:
- 620 mV @ 1 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 50 µA @ 40 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
B140WSQ-7 FAQ
1.How can I place an order for B140WSQ-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for B140WSQ-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 B140WSQ-7 reliable?
The price and inventory of B140WSQ-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for B140WSQ-7 is usually 5 days.
3.What payment methods are accepted for B140WSQ-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for B140WSQ-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for B140WSQ-7?
B140WSQ-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your B140WSQ-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 B140WSQ-7?
For technical support, including B140WSQ-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your B140WSQ-7 requirements.
6.How does Aetrix verify that B140WSQ-7 is sourced from the original manufacturer or authorized distributors?
All B140WSQ-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 B140WSQ-7 meets industry standards.
7.What is the process for return or replacement of B140WSQ-7?
All B140WSQ-7 units undergo pre-shipment inspection (PSI). If there is an issue with B140WSQ-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 B140WSQ-7 part is unused and in its original packaging.
Return procedure for B140WSQ-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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