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Diodes Incorporated BAV21W-7
- Part No.:
- BAV21W-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Diodes
- Package:
- SOD-123
- Datasheet:
-
BAV21W-7.pdf
- Description:
- DIODE GEN PURP 200V 400MA SOD123
- Quantity:
- Payment:
- Shipping:
Inventory:9,117
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Product details
Overview
BAV21W-7 from Diodes Incorporated is a surface-mount fast-switching silicon switching diode with 250 V peak repetitive reverse voltage, 400 mA forward current rating, and 50 ns reverse recovery time, used in high-speed signal routing, clamp protection, and DC-DC converter flyback snubbing circuits.
For engineers reviewing the BAV21W-7 datasheet, BAV21W-7 pinout, BAV21W-7 application, or BAV21W-7 equivalent, key selection criteria include reverse breakdown voltage (250 V), low junction capacitance (5.0 pF at 0 V), thermal resistance (500 °C/W), and SOD123 package compatibility with automated PCB assembly.
Technical Context
This diode operates as a unidirectional voltage-controlled switch in transient suppression and signal steering roles, leveraging its 250 V VRWM, 1.25 V VFM at 200 mA, and 15 µA IR at +100°C to maintain signal integrity under elevated temperature conditions.
Its 50 ns tRR and 5.0 pF CT at 0 V enable use in >1 MHz switching topologies where charge storage and capacitive loading must be minimized-critical for EMI-sensitive power supply feedback paths and logic-level clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 200 V - Maximum continuous DC blocking voltage before leakage exceeds specification |
| V(BR)R | 250 V @ 100 µA - Guaranteed reverse breakdown threshold for overvoltage margin design |
| tRR | 50 ns - Enables reliable operation in 1–5 MHz switching converters without tail current issues |
| CT | 5.0 pF @ 0 V - Limits capacitive loading on high-impedance nodes such as op-amp inputs or crystal oscillator traces |
| PD | 250 mW - Power dissipation limit at 25°C ambient; derates linearly to zero at 150°C per Fig. 1 |
| RθJA | 500 °C/W - Thermal resistance defines junction-to-ambient rise under standard FR-4 pad layout |
Pinout & Package
Package: SOD123 - Surface-mount plastic case (UL 94V-0), 0.01 g mass, cathode band polarity marking, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to lower-potential node in clamp or rectifier configuration; requires trace width sufficient for 400 mA steady-state |
| Cathode (marked) | Forward current exit / reverse blocking terminal | Connected to higher-potential rail or signal line needing protection; cathode band orientation critical for automated placement verification |
Key Features
| Feature | Design Value |
|---|---|
| Fast switching speed | 50 ns reverse recovery enables clean edge transitions in pulse-width modulated control signals |
| High reverse breakdown voltage | 250 V guaranteed breakdown supports 24 V/48 V industrial bus clamping with ≥2× safety margin |
| Low junction capacitance | 5.0 pF minimizes signal distortion in RF detector and high-frequency sampling applications |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU with <900 ppm Br/Cl and <1000 ppm Sb - qualified for green manufacturing lines |
Applications
| Switch-Mode Power Supply Snubber | Logic-Level Signal Clamp |
|---|---|
Use Scenario: Placed across MOSFET drain-source in flyback converters to absorb turn-off voltage spikes. IC Role / Device Role: Passive voltage clamp limiting dv/dt stress on primary-side switch. Use Value: 250 V VRWM and 50 ns tRR prevent secondary breakdown while minimizing energy loss during clamping. | Use Scenario: Connected between microcontroller GPIO and external sensor output to limit input voltage to safe levels. IC Role / Device Role: Bidirectional ESD and overvoltage protector for 3.3 V or 5 V digital interfaces. Use Value: 5.0 pF CT avoids signal edge degradation; 15 µA IR at +100°C ensures low leakage in thermally stressed environments. |
| DC-DC Converter Feedback Path | High-Speed Pulse Detection |
Use Scenario: Used in optocoupler-based isolated feedback loops to rectify error amplifier output pulses. IC Role / Device Role: High-speed rectifier converting AC-coupled error pulses into unidirectional control signals. Use Value: 400 mA IF rating handles peak feedback currents; 1.25 V VFM at 200 mA ensures minimal forward drop impact on loop gain. | Use Scenario: Detecting nanosecond-scale trigger pulses from photodiodes or pulse generators. IC Role / Device Role: Fast-response signal conditioner feeding into comparator or FPGA input. Use Value: 50 ns tRR preserves pulse fidelity; low CT prevents pulse broadening in high-Z detection paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fast-switching diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4148W-7-F | VRWM = 100 V, tRR = 4 ns, CT = 4 pF | Limited to ≤100 V systems; faster but lower voltage margin | Select when ultra-fast recovery (<5 ns) is prioritized over blocking voltage |
| BAV20W-7-F | VRWM = 150 V, V(BR)R = 200 V, identical package and tRR | Lower voltage rating reduces margin in 48 V+ industrial supplies | Choose for cost-sensitive 24 V applications where 150 V blocking suffices |
Compared with 1N4148W-7-F and BAV20W-7-F, BAV21W-7 provides the highest reverse voltage rating (200 V working, 250 V breakdown) in the SOD123 footprint-making it optimal for 48 V and 110 VAC-derived power rails where overvoltage robustness is non-negotiable.
Availability
BAV21W-7 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interface protection, and high-speed pulse conditioning requiring stable component supply and full RoHS 3 compliance.
Supply support for BAV21W-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.
The BAV19W–BAV21W series belongs to Diodes' general-purpose switching diode product line, engineered for high-reliability, automated-assembly-ready performance in commercial power management and signal conditioning applications.
FAQ
What is the maximum junction temperature for BAV21W-7?
The BAV21W-7 has an operating junction temperature range of –55°C to +150°C. Its absolute maximum TJ is +150°C, validated under specified thermal conditions including RθJA = 500 °C/W on FR-4 board with minimum recommended pad layout. Exceeding this limit risks permanent parametric shift or catastrophic failure.
Is BAV21W-7 suitable for automotive applications?
No-BAV21W-7 is rated for commercial temperature range (–55°C to +125°C storage, –55°C to +150°C operation) and lacks AEC-Q101 qualification. For automotive use, specify BAV21WQ-7-F, which is AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities.
How does the SOD123 package affect thermal performance?
The SOD123 package delivers RθJA = 500 °C/W on standard FR-4 PCBs with Diodes' recommended pad layout. Its small footprint (2.65 mm × 1.55 mm) limits copper area for heat spreading; thermal performance improves significantly with thermal vias or enlarged copper pours connected to both anode and cathode pads.
What is the typical forward voltage at 100 mA?
The typical forward voltage of BAV21W-7 is 1.0 V at IF = 100 mA and TA = +25°C, per Electrical Characteristics table. This value increases to ~1.15 V at +100°C due to negative temperature coefficient of VF, and remains within 1.25 V maximum up to 200 mA.
BAV21W-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOD-123
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123
- Operating Temperature - Junction:
- -65°C ~ 150°C
BAV21W-7 FAQ
1.How can I place an order for BAV21W-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for BAV21W-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 BAV21W-7 reliable?
The price and inventory of BAV21W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAV21W-7 is usually 5 days.
3.What payment methods are accepted for BAV21W-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAV21W-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAV21W-7?
BAV21W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAV21W-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 BAV21W-7?
For technical support, including BAV21W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAV21W-7 requirements.
6.How does Aetrix verify that BAV21W-7 is sourced from the original manufacturer or authorized distributors?
All BAV21W-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 BAV21W-7 meets industry standards.
7.What is the process for return or replacement of BAV21W-7?
All BAV21W-7 units undergo pre-shipment inspection (PSI). If there is an issue with BAV21W-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 BAV21W-7 part is unused and in its original packaging.
Return procedure for BAV21W-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAV21W-7 Tags
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1N4148WX-TP
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BAV21W-7-F
Diodes Incorporated
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