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Diodes Incorporated BAS21WQ-7-F
- Part No.:
- BAS21WQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SC-70, SOT-323
- Datasheet:
-
BAS21WQ-7-F.pdf
- Description:
- DIODE GEN PURP 200V 200MA SOT323
- Quantity:
- Payment:
- Shipping:
Inventory:6,535
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Product details
Overview
BAS21WQ-7-F from Diodes Incorporated is a surface-mount fast-switching epitaxial planar silicon switching diode in SOT323 package, rated for 250 V repetitive peak reverse voltage, 400 mA forward continuous current, and 50 ns reverse recovery time. It serves as a high-speed clamping, protection, or signal routing device in automotive power management and industrial control circuits.
For engineers reviewing the BAS21WQ-7-F datasheet, BAS21WQ-7-F pinout, BAS21WQ-7-F application, or BAS21WQ-7-F equivalent, this part supports AEC-Q100 qualified designs requiring low leakage (≤100 nA at 25°C), high breakdown voltage, and stable thermal performance up to +150°C ambient.
Technical Context
The BAS21WQ-7-F uses an epitaxial planar structure optimized for fast recovery with tRR = 50 ns under IF = IR = 30 mA, IRR = 0.1 × IR, RL = 100 Ω. Its junction-to-ambient thermal resistance is 625 °C/W on FR-4 PCB with recommended pad layout.
It delivers low forward voltage (VF ≤ 1.25 V at IF = 200 mA) and minimal capacitance (CT ≤ 5.0 pF at VR = 0 V, f = 1 MHz), enabling use in high-frequency signal conditioning and transient suppression where parasitic effects must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 250 V - Withstands repetitive reverse transients up to 250 V without breakdown |
| IF | 400 mA - Supports continuous forward conduction in low-power signal path applications |
| tRR | 50 ns - Enables reliable operation in >10 MHz switching circuits with minimal tail current |
| IR | 100 nA @ 25°C - Ensures minimal leakage in high-impedance bias or sensing nodes |
| CT | 5.0 pF @ VR = 0 V - Limits capacitive loading in RF and fast digital interface lines |
| PD | 200 mW - Defines maximum steady-state power dissipation on standard FR-4 layout |
| TJ | –55 to +150 °C - Qualified for under-hood automotive and industrial environments |
Pinout & Package
Package: SOT323 - ultra-small surface-mount plastic package (2.15 mm × 2.10 mm × 0.95 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 during conduction; requires proper trace width for 400 mA |
| Cathode (Pin 2) | Forward current exit / reverse blocking terminal | Typically tied to ground or lower-potential rail; defines polarity of clamping action |
| Case / Heat Sink (Pin 3) | Non-electrical mechanical connection | Exposed metal tab not internally connected; provides mechanical stability but no thermal or electrical function |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualification | Validated for automotive-grade reliability including temperature cycling, HTOL, and ESD testing per Grade 1 requirements |
| Low leakage current | IR ≤ 100 nA at 25°C enables stable DC biasing in precision analog front-ends |
| Fast reverse recovery | tRR = 50 ns allows use in high-frequency flyback snubbers and data line protection without signal distortion |
| Green packaging | Halogen- and antimony-free molding compound (<900 ppm Br/Cl, <1000 ppm Sb) meets automotive environmental compliance mandates |
| SOT323 footprint | Standardized 3-pin outline compatible with automated pick-and-place and reflow processes in high-volume manufacturing |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Clamping inductive kickback from door lock actuators and mirror motors. IC Role / Device Role / Timing Role: Fast-recovery diode providing bidirectional transient suppression across 12 V supply rails. Use Value: Prevents MCU I/O damage by limiting voltage spikes to ≤250 V while maintaining <50 ns response to fast edges. | Use Scenario: Protecting 24 V digital input channels against field-wiring surges and polarity reversal. IC Role / Device Role / Timing Role: Reverse-polarity and ESD protection diode placed before optocoupler input stage. Use Value: Leverages 200 V working reverse voltage and <100 nA leakage to preserve input impedance integrity over full industrial temperature range. |
| USB Port ESD Clamp | High-Speed Signal Line Isolation |
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines adjacent to TVS array. IC Role / Device Role / Timing Role: Low-capacitance (5 pF) shunt diode absorbing sub-100 ns transients without signal degradation. Use Value: Maintains signal integrity up to 480 Mbps by minimizing parasitic loading versus larger-package alternatives. | Use Scenario: Isolating clock or data signals between mixed-voltage domains (e.g., 3.3 V ↔ 5 V logic). IC Role / Device Role / Timing Role: Unidirectional level-shifting diode enabling controlled forward conduction while blocking reverse leakage. Use Value: Achieves clean edge transitions with VF ≤ 1.25 V at 200 mA, supporting timing-critical interfaces without added propagation delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast-switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAS16W-7-F | VRRM = 100 V, tRR = 4 ns, IF = 200 mA - faster but lower voltage rating | Not suitable for 200 V+ blocking; limited to low-voltage logic-level clamping | Select only when speed dominates voltage requirement and system transients stay below 100 V |
| 1N4148W-7-F | VRRM = 100 V, tRR = 4 ns, IF = 300 mA - legacy part with identical SOT323 package | Lacks AEC-Q100 qualification and automotive change control documentation | Acceptable for commercial-grade designs but not for automotive PPAP submissions |
Compared with BAS16W-7-F and 1N4148W-7-F, the BAS21WQ-7-F uniquely balances 250 V blocking capability, 50 ns recovery, and automotive qualification-making it the only option among the three validated for under-hood 12 V/24 V systems requiring long-term reliability and change-controlled sourcing.
Availability
BAS21WQ-7-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, USB peripheral protection, and high-speed signal isolation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BAS21WQ-7-F 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 BAS21WQ belongs to Diodes' automotive-qualified fast-switching diode product line, engineered specifically for robust transient suppression and signal routing in harsh-environment vehicle subsystems and industrial controls.
FAQ
Is BAS21WQ-7-F pin-compatible with 1N4148W-7-F?
Yes, both use the SOT323 package with identical pin 1 (anode), pin 2 (cathode), and pin 3 (case) assignments. However, BAS21WQ-7-F has higher VRRM (250 V vs. 100 V) and slower tRR (50 ns vs. 4 ns), so direct substitution requires verification of voltage stress and timing margins in the target circuit.
What is the maximum operating temperature for continuous use?
The BAS21WQ-7-F is rated for continuous operation from –55°C to +150°C junction temperature. At +150°C ambient, derating reduces allowable power dissipation to ~80 mW based on the published 625 °C/W RθJA curve and 200 mW absolute maximum rating.
Does BAS21WQ-7-F require special PCB layout considerations?
Yes - Diodes specifies a recommended SOT323 pad layout (available at diodes.com/package-outlines.html) to ensure thermal performance and solder joint reliability. Use of non-recommended pads may reduce power handling, increase thermal resistance, and risk tombstoning during reflow.
Can BAS21WQ-7-F be used in AC signal rectification?
It is rated for average rectified output current (IO) of 200 mA and RMS reverse voltage of 141 V, making it suitable for low-current, high-voltage AC-to-DC conversion in auxiliary power supplies or sensor excitation circuits - provided peak reverse voltage remains ≤250 V and thermal limits are observed.
BAS21WQ-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:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 200 V
- Current - Average Rectified (Io):
- 200mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.25 V @ 200 mA
- Speed:
- Small Signal =< 200mA (Io), Any Speed
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 100 nA @ 200 V
- Capacitance @ Vr, F:
- 5pF @ 0V, 1MHz
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323
- Operating Temperature - Junction:
- -65°C ~ 150°C
BAS21WQ-7-F FAQ
1.How can I place an order for BAS21WQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BAS21WQ-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 BAS21WQ-7-F reliable?
The price and inventory of BAS21WQ-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 BAS21WQ-7-F is usually 5 days.
3.What payment methods are accepted for BAS21WQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21WQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAS21WQ-7-F?
BAS21WQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAS21WQ-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 BAS21WQ-7-F?
For technical support, including BAS21WQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21WQ-7-F requirements.
6.How does Aetrix verify that BAS21WQ-7-F is sourced from the original manufacturer or authorized distributors?
All BAS21WQ-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 BAS21WQ-7-F meets industry standards.
7.What is the process for return or replacement of BAS21WQ-7-F?
All BAS21WQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BAS21WQ-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 BAS21WQ-7-F part is unused and in its original packaging.
Return procedure for BAS21WQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAS21WQ-7-F Tags
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BAV21W-7-F
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