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Diotec Semiconductor BAV21
- Part No.:
- BAV21
- Manufacturer:
- Diotec Semiconductor
- Category:
- Single Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
BAV21.pdf
- Description:
- DIODE GEN PURP 200V 0.25A DO35
- Quantity:
- Payment:
- Shipping:
Inventory:6,443
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Product details
Overview
BAV21 from ON Semiconductor is a fast-switching planar epitaxial silicon switching diode in DO-35 glass package, rated for 250 V repetitive peak reverse voltage (VRRM), 200 mA average rectified output current (I₀), and 50 ns reverse recovery time (trr), used in high-frequency clamp, snubber, and signal demodulation circuits.
For engineers reviewing the BAV21 datasheet, BAV21 pinout, BAV21 application, or BAV21 equivalent, key selection criteria include its low 15 nA reverse leakage at 200 V/100 °C, 1.0 V max forward voltage at 100 mA, 1.5 pF junction capacitance at 0 V, and thermal resistance of 300 K/W - critical for compact, thermally constrained signal-path designs.
Technical Context
The BAV21 operates as a unidirectional, low-capacitance, fast-recovery switching diode optimized for frequencies up to several hundred MHz. Its planar die construction ensures stable reverse breakdown and low leakage across -65 °C to +175 °C operating range.
It delivers consistent dynamic performance with 5.0 Ω typical dynamic forward resistance at 10 mA and maintains <50 ns reverse recovery under standardized IF = IR = 30 mA test conditions, enabling reliable operation in pulse shaping and flyback snubbing applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 250 V - supports DC blocking in 200 V rail systems with 25 % safety margin |
| trr | 50 ns - enables clean switching in >2 MHz pulse circuits without tail current |
| I₀ | 200 mA - sufficient for low-power signal routing and logic-level clamping |
| Cj | 1.5 pF @ 0 V - minimizes capacitive loading in RF detector and sampling circuits |
| IR | 15 nA @ 200 V, 100 °C - ensures low standby power loss in battery-backed signal paths |
| RJA | 300 K/W - requires minimal PCB copper area for thermal management in DO-35 layout |
Pinout & Package
DO-35 glass axial package with cathode band marking; leads are solderable per MIL-STD-202, Method 208; overall dimensions: 4.0 mm max body length, 2.0 mm max body diameter, 0.6 mm lead diameter.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Forward current entry point | Connects to lower-potential node in clamping or rectification path |
| Cathode (band-marked end) | Forward current exit / reverse-blocking terminal | Connects to higher-potential node; defines polarity-sensitive placement in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| Fast reverse recovery | 50 ns trr enables use in >2 MHz switching without commutation loss |
| Low junction capacitance | 1.5 pF Cj preserves signal integrity in RF and high-speed digital interfaces |
| High-temperature reliability | Rated for continuous operation up to +175 °C junction temperature |
| Low leakage at elevated stress | 15 nA IR at 200 V/100 °C reduces standby current in always-on monitoring circuits |
Applications
| Signal Clamping | RF Demodulation |
|---|---|
Use Scenario: Protecting ADC input stages from ESD-induced overvoltage transients in portable instrumentation. IC Role / Device Role / Timing Role: Fast-clamp diode limiting input swing to ±0.7 V while preserving signal edge fidelity. Use Value: 50 ns trr and 1.5 pF Cj prevent transient-induced sampling error or latch-up in sub-µs acquisition windows. | Use Scenario: Envelope detection in 10–100 MHz IF stages of AM radio receivers. IC Role / Device Role / Timing Role: Low-capacitance signal rectifier converting RF carrier amplitude to baseband voltage. Use Value: 1.5 pF Cj avoids detuning LC tank circuits; 15 nA IR prevents DC offset drift in high-impedance load networks. |
| Flyback Snubber | Digital Logic Level Shifting |
Use Scenario: Suppressing voltage spikes across MOSFET drains in 50–200 kHz SMPS flyback converters. IC Role / Device Role / Timing Role: Fast-recovery snubber diode diverting inductive kickback energy into RC network. Use Value: 250 V VRRM withstands reflected primary-side transients; 50 ns trr ensures full energy transfer before next switching cycle. | Use Scenario: Translating 3.3 V logic signals to 5 V-tolerant microcontroller inputs in mixed-voltage embedded systems. IC Role / Device Role / Timing Role: Passive level-shifting diode providing bidirectional voltage offset with minimal propagation delay. Use Value: 1.0 V VFM at 100 mA ensures predictable threshold shift; DO-35 axial form factor simplifies hand-soldered prototyping. |
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 (SOD-123) | Same electrical specs; surface-mount package with 1.7 mm × 1.2 mm footprint | Required for automated PCB assembly; lacks axial lead flexibility for breadboarding | Select when board space or reflow compatibility is prioritized over manual repairability |
| 1N4148W (SOD-123) | Lower VRRM (100 V), higher trr (4 ns typical but 4–8 ns max), same Cj and IR | Suitable only for ≤100 V signal paths; less robust in high-voltage transient suppression | Choose for cost-sensitive, low-voltage digital logic applications where 250 V rating is unnecessary |
Compared with BAV21, BAV21W offers identical electrical behavior in a smaller SMT package ideal for volume production, while 1N4148W trades voltage headroom and recovery consistency for broader commercial availability in low-voltage digital systems.
Availability
BAV21 is available at Aetrix Electronics and suitable for signal clamping, RF demodulation, flyback snubber, and digital level shifting requiring stable component supply and long-term industrial availability.
Supply support for BAV21 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The BAV21 belongs to ON Semiconductor's legacy fast-switching diode product line, designed specifically for high-reliability signal-path protection and high-frequency rectification in space-constrained, thermally demanding environments.
FAQ
What is the maximum junction temperature for continuous operation of the BAV21?
The BAV21 is rated for continuous operation from -65 °C to +175 °C junction temperature. This wide range allows deployment in under-hood automotive sensors, industrial motor controllers, and downhole instrumentation where ambient temperatures exceed 125 °C and thermal cycling is severe.
Can the BAV21 replace a 1N4148 in a 200 V clamp circuit?
No - the 1N4148 has only 100 V VRRM, making it unsuitable for 200 V clamping. The BAV21's 250 V rating provides necessary margin against transients and derating, while its 50 ns trr and 1.5 pF Cj match or exceed 1N4148 performance in high-frequency contexts.
Is the DO-35 package RoHS compliant and lead-free?
Yes - the BAV21 in DO-35 packaging meets RoHS Directive 2011/65/EU and is lead-free per J-STD-609. Lead finish is matte tin over nickel, verified per ON Semiconductor's PPAP documentation and Digi-Key/Mouser compliance reports.
How does reverse leakage change with temperature and voltage stress?
At 25 °C and 200 V, IR is ≤15 nA; at 100 °C and same voltage, it rises to ≤100 nA. Figure 4 in DS22006 shows IR increases exponentially with TJ, doubling roughly every 10 °C - critical for battery-powered systems where leakage dominates quiescent current budget.
BAV21 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diotec Semiconductor
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Technology:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 200 V
- Current - Average Rectified (Io):
- 250mA
- Voltage - Forward (Vf) (Max) @ If:
- 1 V @ 100 mA
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 50 ns
- Current - Reverse Leakage @ Vr:
- 100 nA @ 200 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-35
- Operating Temperature - Junction:
- -50°C ~ 200°C
BAV21 FAQ
1.How can I place an order for BAV21 through Aetrix?
Please submit a Request for Quotation (RFQ) for BAV21 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 BAV21 reliable?
The price and inventory of BAV21 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAV21 is usually 5 days.
3.What payment methods are accepted for BAV21?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAV21 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BAV21?
BAV21 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BAV21 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 BAV21?
For technical support, including BAV21 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAV21 requirements.
6.How does Aetrix verify that BAV21 is sourced from the original manufacturer or authorized distributors?
All BAV21 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 BAV21 meets industry standards.
7.What is the process for return or replacement of BAV21?
All BAV21 units undergo pre-shipment inspection (PSI). If there is an issue with BAV21, 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 BAV21 part is unused and in its original packaging.
Return procedure for BAV21:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BAV21 Tags
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1N4448X-TP
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1N4148WX-TP
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1N4148TR
onsemi
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MMSD4148T1G
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MMBD914LT3G
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BAS16HT1G
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1N914BWT
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BAS21LT1G
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MMSD914T1G
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BAV21W-7-F
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