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Diodes Incorporated BAS40WQ-7-F
- Part No.:
- BAS40WQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BAS40WQ-7-F.pdf
- Description:
- DIODE SCHOTT 40V 200MA SOT323 3K
- Quantity:
- Payment:
- Shipping:
Inventory:4,545
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Product details
Overview
BAS40WQ from Diodes Incorporated is a 200mA, 40V peak repetitive reverse voltage Schottky barrier diode in SOT323 package, featuring 380mV forward voltage at 1mA, 5ns reverse recovery time, and 200nA leakage current at 30V - deployed in automotive power rail clamping and low-loss DC-DC converter freewheeling paths.
For engineers reviewing the BAS40WQ datasheet, BAS40WQ pinout, BAS40WQ application, or BAS40WQ equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal derating behavior, junction-to-ambient thermal resistance (330°C/W), and direct replacement guidance for high-speed, low-VF discrete diode selection.
Technical Context
The BAS40WQ implements a planar Schottky junction with PN guard ring structure to suppress ESD transients and improve surge robustness without compromising switching speed. Its 5ns trr and sub-1V VF enable efficient high-frequency rectification in space-constrained automotive modules.
Designed for IATF16949-certified production, it operates across –55°C to +125°C ambient, with 330mW power dissipation at 25°C and linear derating to zero at 125°C - supporting under-hood applications where thermal margin and reliability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum reverse blocking capability before breakdown; suitable for 24V automotive systems with transient margin |
| IF(AV) | 200 mA - Continuous forward current rating; supports low-power signal path protection and bias networks |
| VF @ 1mA | 380 mV - Low conduction loss at light load; reduces standby power in always-on circuits |
| trr | 5 ns - Fast recovery enables >10MHz switching in snubberless flyback or synchronous rectifier assist |
| IR @ 30V | 200 nA - Ultra-low leakage preserves battery life in automotive sleep-mode monitoring circuits |
| RθJA | 330 °C/W - Thermal resistance on FR4 board; requires minimal copper area for thermal management |
| CT @ 0V | 5.0 pF - Low junction capacitance minimizes RF noise coupling in high-speed data line protection |
Pinout & Package
Package: SOT323 - ultra-small surface-mount plastic package (2.0 × 2.225 × 0.9 mm), moisture sensitivity level 1, lead-free matte tin plating over Alloy 42 leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Forward current entry point | Connected to higher-potential node in clamping or freewheeling configuration |
| Cathode (Pin 2) | Forward current exit / reverse voltage reference | Typically tied to ground or lower-rail node; defines polarity for ESD protection direction |
| Case / Exposed Pad (Pin 3) | Thermal and mechanical anchor | Non-electrical; provides mechanical stability and minor thermal relief via PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| PN junction guard ring | Enhances ESD immunity (HBM >8kV) and transient surge tolerance without increasing VF or trr |
| AEC-Q101 qualification | Validated for automotive powertrain and body electronics per stress test requirements |
| Lead-free & halogen-free | Meets RoHS 3 (2015/863/EU) and "Green" definition (<900ppm Br/Cl, <1000ppm Sb) |
| Low thermal resistance packaging | SOT323 construction enables 330°C/W RθJA on standard FR4 - no thermal pad required |
Applications
| Automotive Power Rail Clamping | USB Port ESD Protection |
|---|---|
Use Scenario: Suppresses load-dump transients (ISO 7637-2 Pulse 5a) on 12V/24V vehicle power distribution nodes. IC Role / Device Role / Timing Role: Discrete Schottky clamp diode placed between battery rail and protected IC supply input. Use Value: 40V VRRM and guard ring structure withstand 35V/100ms pulses while maintaining sub-1V clamping threshold. | Use Scenario: Protects USB 2.0 data lines (D+/D−) against contact ESD events per IEC 61000-4-2 Level 4. IC Role / Device Role / Timing Role: Low-capacitance (5pF) bidirectional clamping diode in series with signal path. Use Value: 5ns trr prevents signal distortion at 480Mbps; 200nA IR avoids DC bias shift in high-impedance receivers. |
| Low-Power DC-DC Freewheeling | Smart Sensor Bias Supply |
Use Scenario: Freewheeling path in 3.3V/5V buck converters powering infotainment microcontrollers. IC Role / Device Role / Timing Role: Synchronous rectifier assist or standalone flyback diode in 1–2MHz switching regulators. Use Value: 380mV VF at 1mA reduces light-load losses by >40% vs. standard silicon diodes, improving efficiency at 10–100μA output. | Use Scenario: Provides isolated bias for MEMS pressure sensors in tire pressure monitoring systems (TPMS). IC Role / Device Role / Timing Role: Reverse-polarity protection and leakage-suppression element in ultra-low-quiescent LDO input stage. Use Value: 200nA IR ensures <1μA total input leakage - critical for 10-year battery life in coin-cell-powered sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schottky diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MBR0540T1G (ON Semiconductor) | Higher IF(AV) = 500mA; larger SOT23 package; VF = 450mV @ 1mA | Preferred for higher-current freewheeling; less suitable for ultra-low-leakage sensor bias | Select when >200mA average current or higher surge handling (IFSM = 1.5A) is required |
| SBM140 (Skyworks) | Same SOT323 footprint; VF = 410mV @ 1mA; IR = 500nA @ 30V | Marginally higher leakage; identical thermal and ESD performance | Acceptable drop-in where 300nA extra leakage is tolerable in non-battery-critical designs |
Compared with MBR0540T1G and SBM140, the BAS40WQ uniquely balances ultra-low leakage (200nA), AEC-Q101 qualification, and SOT323 size - making it optimal for space- and reliability-constrained automotive sensor and interface protection.
Availability
BAS40WQ is available at Aetrix Electronics and suitable for automotive power rail clamping, USB port ESD protection, and low-power DC-DC freewheeling requiring stable component supply and full traceability.
Supply support for BAS40WQ 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 BAS40WQ belongs to Diodes' automotive-qualified Schottky diode product line, engineered specifically for high-reliability, low-VF, fast-switching roles in vehicle subsystems operating under harsh thermal and ESD conditions.
FAQ
Is BAS40WQ qualified for automotive use?
Yes. The BAS40WQ is AEC-Q101 qualified, PPAP capable, and manufactured in IATF16949 certified facilities. It meets automotive-grade temperature range (–55°C to +125°C), humidity, and mechanical stress requirements, and includes PN guard ring for ESD robustness - validated per HBM >8kV.
What is the maximum reverse voltage the BAS40WQ can block continuously?
The BAS40WQ has a peak repetitive reverse voltage (VRRM) rating of 40V. This is the maximum DC or sinusoidal peak reverse voltage it can block continuously without breakdown, verified at TA = +25°C with IR ≤ 200nA at VR = 30V.
Does BAS40WQ require a thermal pad on the PCB?
No. The SOT323 package uses only two active terminals (anode/cathode); the third pin is a non-electrical case tab. Thermal management relies on standard copper traces - RθJA is specified as 330°C/W on FR4 with recommended pad layout, and no thermal pad is needed for its 330mW PD rating.
How does BAS40WQ compare to standard silicon diodes in switching speed?
The BAS40WQ achieves 5ns reverse recovery time (trr), versus typical 500ns–2μs for small-signal silicon diodes. This enables clean switching in >10MHz applications like USB signal clamping or high-frequency DC-DC converters, with negligible minority-carrier storage delay.
BAS40WQ-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io):
- 200mA
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 40 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 5 ns
- Current - Reverse Leakage @ Vr:
- 200 nA @ 30 V
- Capacitance @ Vr, F:
- 5pF @ 0V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
- Operating Temperature - Junction:
- -55°C ~ 125°C
BAS40WQ-7-F FAQ
1.How can I place an order for BAS40WQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS40WQ-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 BAS40WQ-7-F reliable?
The price and inventory of BAS40WQ-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 BAS40WQ-7-F is usually 5 days.
3.What payment methods are accepted for BAS40WQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS40WQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS40WQ-7-F?
BAS40WQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS40WQ-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 BAS40WQ-7-F?
For technical support, including BAS40WQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS40WQ-7-F requirements.
6.How does Aetrix verify that BAS40WQ-7-F is sourced from the original manufacturer or authorized distributors?
All BAS40WQ-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 BAS40WQ-7-F meets industry standards.
7.What is the process for return or replacement of BAS40WQ-7-F?
All BAS40WQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BAS40WQ-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 BAS40WQ-7-F part is unused and in its original packaging.
Return procedure for BAS40WQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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