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Diodes Incorporated BAV21WQ-7-F
- Part No.:
- BAV21WQ-7-F
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SOD-123
- Datasheet:
-
BAV21WQ-7-F.pdf
- Description:
- DIODE GEN PURP 200V 400MA SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:2,750
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Product details
Overview
BAV21WQ-7-F from Diodes Incorporated is an AEC-Q101 qualified automotive-grade surface-mount fast switching diode in SOD-123 package, with 250 V peak repetitive reverse voltage (VRWM), 400 mA forward current (IF), and 50 ns reverse recovery time (tRR), used for high-speed signal routing and voltage clamping in engine control units and ADAS power supplies.
For engineers reviewing the BAV21WQ-7-F datasheet, BAV21WQ-7-F pinout, BAV21WQ-7-F application, or BAV21WQ-7-F equivalent, key selection criteria include reverse breakdown voltage margin, thermal resistance (500 °C/W), junction temperature range (–55 to +150 °C), and automotive qualification status for under-hood deployment.
Technical Context
This diode operates as a unidirectional voltage-controlled switch with low forward voltage drop (1.25 V at 200 mA) and minimal junction capacitance (5.0 pF at 0 V), enabling clean signal edge preservation in digital logic interfaces and flyback snubbing circuits. Its fast tRR of 50 ns supports switching frequencies up to ~10 MHz in pulse-width modulated auxiliary rails.
The device uses an alloy-42 leadframe with matte tin plating and conforms to J-STD-020 Level 1 moisture sensitivity, allowing direct reflow without baking. Its SOD-123 mechanical outline (D = 1.55 mm, E = 2.65 mm) ensures compatibility with standard 0805 footprint land patterns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 200 V - DC blocking capability for 24 V automotive systems with ≥2× safety margin against load-dump transients |
| IF | 400 mA - Continuous conduction rating sufficient for sensor biasing and LED indicator drive |
| tRR | 50 ns - Enables use in 1–10 MHz clocked clamp or freewheeling paths without tail-current distortion |
| CT | 5.0 pF @ 0 V - Low capacitive loading preserves signal integrity in high-impedance analog sensing nodes |
| RθJA | 500 °C/W - Requires minimal copper area on FR-4 PCB to maintain TJ < 125 °C at full IF |
| TJ/TSTG | –55 to +150 °C - Validated operation across full automotive under-hood ambient envelope |
Pinout & Package
Package: SOD-123 - Surface-mount plastic case (UL 94V-0), 0.01 g mass, cathode band polarity marking, compatible with automated pick-and-place and IR/reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node (e.g., GND or return path) during conduction |
| Cathode | Forward current exit / reverse blocking terminal | Marked by band; tied to higher-potential rail (e.g., 12 V or switched supply) for clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HTRB, and ESD testing per IATF 16949 production flow |
| Lead-free & green construction | Meets RoHS 3 (2015/863/EU) and halogen-free (<900 ppm Br+Cl, <1000 ppm Sb) requirements for end-of-life compliance |
| Fast recovery performance | 50 ns tRR enables efficient energy transfer in boost converters and reduces EMI in switching node snubbers |
| SOD-123 footprint compatibility | Standardized 0805-equivalent pad layout simplifies PCB reuse across BAV19W/BAV20W/BAV21W series |
Applications
| Engine Control Unit (ECU) Input Protection | ADAS Camera Power Sequencing |
|---|---|
Use Scenario: Clamps transient spikes on 5 V sensor input lines exposed to ISO 7637-2 pulse 5a (load dump). IC Role / Device Role / Timing Role: Unidirectional overvoltage clamp placed between connector and MCU GPIO. Use Value: 200 V VRWM withstands 120 V transients; 50 ns tRR prevents latch-up during fast-rising edges. | Use Scenario: Freewheeling path for buck converter driving image sensor bias rail. IC Role / Device Role / Timing Role: Synchronous rectifier alternative in low-power 3.3 V output stage. Use Value: 1.25 V VFM at 200 mA minimizes dropout; SOD-123 thermal resistance supports 400 mA pulsed loads. |
| Infotainment System USB Port ESD Clamp | Body Control Module (BCM) Relay Drive |
Use Scenario: Secondary protection behind TVS diode on USB 2.0 D+/D− lines. IC Role / Device Role / Timing Role: Low-capacitance (5.0 pF) steering diode for signal-line clamping. Use Value: Minimal CT avoids signal rise-time degradation; AEC-Q101 ensures reliability across vehicle lifetime. | Use Scenario: Flyback suppression across 12 V relay coil in door module. IC Role / Device Role / Timing Role: Fast-recovery freewheeling diode absorbing inductive kickback. Use Value: 50 ns tRR limits voltage overshoot to <250 V; 250 mW PD handles 100 ms coil de-energization pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BAV21W-7-F | Commercial grade (non-AEC-Q101); identical electrical specs and SOD-123 package | Lacks PPAP documentation and IATF 16949 traceability; unsuitable for production automotive programs | Select only for prototyping or non-automotive industrial use where qualification is not required |
| 1N4148W-T | Higher tRR (4 ns typical but 40 ns max), lower VRWM (100 V), same SOD-123 package | Not qualified for automotive; limited to ≤12 V systems; insufficient for 24 V load-dump immunity | Acceptable for consumer electronics signal routing but fails automotive voltage and reliability thresholds |
Compared with BAV21W-7-F, the BAV21WQ-7-F adds mandatory automotive change control and PPAP support without electrical trade-offs; versus 1N4148W-T, it delivers 2× higher reverse voltage rating and guaranteed AEC-Q101 stress test coverage for under-hood deployment.
Availability
BAV21WQ-7-F is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, infotainment USB protection, and body control module relay drivers requiring stable component supply across multi-year automotive production cycles.
Supply support for BAV21WQ-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 BAVxxWQ series belongs to Diodes' automotive-qualified switching diode product line, engineered specifically for robustness in harsh-temperature, high-transient environments such as powertrain and chassis electronics.
FAQ
What is the maximum allowable junction temperature for continuous operation?
The BAV21WQ-7-F is rated for junction temperatures from –55 °C to +150 °C. At ambient temperatures above 75 °C, derating is required per Figure 1: power dissipation must be reduced linearly from 250 mW at 25 °C to zero at 150 °C, based on its 500 °C/W thermal resistance.
Is the cathode band orientation consistent across all SOD-123 packaged Diodes switching diodes?
Yes - all Diodes SOD-123 switching diodes, including BAV19WQ, BAV20WQ, and BAV21WQ, mark the cathode with a single molded band at the top edge of the package body, aligned with the shorter side of the rectangular outline per JEDEC MO-203-AB.
Does BAV21WQ-7-F support wave soldering in addition to reflow?
No - the device is qualified only for lead-free reflow soldering per J-STD-020 Class 1 moisture sensitivity. Wave soldering is not recommended due to thermal stress risks from prolonged exposure above 260 °C and potential delamination of the molded plastic case.
How does the 50 ns reverse recovery time impact EMI generation in switching power supplies?
A 50 ns tRR limits reverse recovery charge (Qrr) to ~15 nC, reducing high-frequency ringing amplitude on switching nodes. This directly lowers conducted EMI in buck converter outputs and eases compliance with CISPR 25 Class 5 limits in automotive power designs.
BAV21WQ-7-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 200 V
- Current - Average Rectified (Io):
- 400mA
- Voltage - Forward (Vf) (Max) @ If:
- 1.25 V @ 200 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- 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:
- SOD-123
- Operating Temperature - Junction:
- -55°C ~ 150°C
BAV21WQ-7-F FAQ
1.How can I place an order for BAV21WQ-7-F through Aetrix?
Please submit a Request for Quotation (RFQ) for BAV21WQ-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 BAV21WQ-7-F reliable?
The price and inventory of BAV21WQ-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 BAV21WQ-7-F is usually 5 days.
3.What payment methods are accepted for BAV21WQ-7-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAV21WQ-7-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAV21WQ-7-F?
BAV21WQ-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAV21WQ-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 BAV21WQ-7-F?
For technical support, including BAV21WQ-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAV21WQ-7-F requirements.
6.How does Aetrix verify that BAV21WQ-7-F is sourced from the original manufacturer or authorized distributors?
All BAV21WQ-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 BAV21WQ-7-F meets industry standards.
7.What is the process for return or replacement of BAV21WQ-7-F?
All BAV21WQ-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BAV21WQ-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 BAV21WQ-7-F part is unused and in its original packaging.
Return procedure for BAV21WQ-7-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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