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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Diodes Incorporated BAV21W-7-F

Name: BAV21W-7-F
Brand: Diodes Incorporated
SKU: BAV21W-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BAV21W-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: SOD-123

Datasheet:: BAV21W-7-F.pdf

Description:: DIODE GEN PURP 200V 400MA SOD123

Quantity:: RFQ Add To RFQ list

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Inventory:268,009

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Product details

Overview

BAV21W-7-F from Diodes Incorporated is a surface-mount fast-switching silicon switching diode with 250 V peak repetitive reverse voltage (V_RRM), 400 mA forward current (I_F), and 50 ns reverse recovery time (t_RR), designed for high-voltage clamping, polarity protection, and signal routing in power supply and interface circuits.

For engineers reviewing the BAV21W-7-F datasheet, BAV21W-7-F pinout, BAV21W-7-F application, or BAV21W-7-F equivalent, this device serves as a general-purpose high-V_R switching diode in space-constrained SOD123 layouts where low capacitance (5.0 pF), fast recovery, and robust thermal derating (500 °C/W R_θJA) are critical.

Technical Context

This diode operates as a unidirectional voltage-controlled switch with cathode-banded polarity, optimized for transient suppression and DC blocking in low-power analog and digital signal paths. Its 250 V V_RRM rating enables use in 170 V_RMS AC line interfaces and flyback snubbers, while its 50 ns t_RR supports switching frequencies up to several MHz.

The SOD123 package provides mechanical stability and solderability per MIL-STD-202 Method 208, with a 0.01 g mass and UL 94V-0 flammability rating. Thermal performance is defined under FR-4 PCB conditions, delivering 250 mW power dissipation at 25°C ambient and linear derating to zero at 150°C junction temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	250 V - Supports DC blocking in 170 V_RMS AC applications and 200 V DC rails without breakdown.
I_F	400 mA continuous - Sustains steady-state current in low-power logic-level clamping and bias networks.
t_RR	50 ns - Enables clean switching in PWM control feedback paths and high-frequency signal routing.
C_T	5.0 pF @ 0 V - Minimizes capacitive loading on high-impedance nodes such as oscillator inputs or sensor lines.
V_F	1.25 V @ 200 mA - Delivers predictable forward drop for precision voltage thresholding and level translation.
R_θJA	500 °C/W - Requires minimal copper area for thermal management in compact consumer and industrial PCBs.

Pinout & Package

Package: SOD123 - Surface-mount plastic case (UL 94V-0), 0.01 g mass, moisture sensitivity level 1, cathode indicated by band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node in clamping or rectification; requires no external biasing.
Cathode	Forward current exit / reverse-blocking terminal	Marked by band; ties to higher-potential rail in reverse-biased protection configurations.

Key Features

Feature	Design Value
Fast switching speed	50 ns reverse recovery enables use in >1 MHz signal path switching without tail current distortion.
High reverse breakdown voltage	250 V V_RRM allows direct integration into 200 V DC bus monitoring and surge-limited input stages.
SOD123 surface-mount package	Compact 2.65 mm × 1.55 mm footprint supports automated placement and reflow in high-density layouts.
Lead-free & RoHS 3 compliant	Fully compliant with EU Directive 2015/863/EU; matte tin plating ensures reliable solder joint formation.

Applications

AC Line Protection

Logic-Level Clamping

Use Scenario: Protecting microcontroller I/O pins from induced transients on 24 V industrial fieldbus lines.

IC Role / Device Role / Timing Role: Unidirectional voltage clamp limiting input swing to safe levels during ESD or inductive kick events.

Use Value: 250 V V_RRM prevents breakdown during 1 kV surge tests; 50 ns t_RR avoids latch-up in fast-rising edge environments.

Use Scenario: Level-shifting 5 V logic signals to 3.3 V domains using passive resistor-diode networks.

IC Role / Device Role / Timing Role: Forward-biased voltage reference element establishing fixed offset between voltage domains.

Use Value: 1.25 V V_F @ 200 mA ensures stable threshold; 5.0 pF C_T prevents signal integrity degradation at 10 MHz clock rates.

DC Power Rail Polarity Guard

Flyback Snubber Network

Use Scenario: Preventing damage from reversed battery or adapter connections in portable medical sensors.

IC Role / Device Role / Timing Role: Series-connected blocking diode ensuring current flows only when polarity matches design intent.

Use Value: 400 mA I_F handles peak load currents; SOD123 thermal resistance supports operation at 85°C ambient without derating.

Use Scenario: Suppressing voltage spikes across MOSFET drains in 24 V offline SMPS auxiliary windings.

IC Role / Device Role / Timing Role: Fast-recovery snubber diode absorbing inductive energy during switch turn-off.

Use Value: 50 ns t_RR minimizes switching loss; 250 V V_RRM withstands reflected flyback voltages exceeding 200 V.

Equivalent & Alternatives

The following parts are listed as comparable options for similar switching diode applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BAV20W-7-F	200 V V_RRM, identical t_RR, package, and I_F	Limited to ≤141 V_RMS AC inputs; unsuitable for 200 V DC bus monitoring.	Select when system maximum reverse voltage is ≤200 V and cost optimization is prioritized.
1N4148W-TB	100 V V_RRM, 4.0 pF C_T, same SOD123 package	Not rated for >70 V DC blocking; faster t_RR (4 ns) but lower voltage margin.	Prefer for low-voltage, ultra-high-speed signal steering where voltage stress is <100 V.

Compared with BAV20W-7-F and 1N4148W-TB, the BAV21W-7-F uniquely balances 250 V standoff capability with 50 ns switching-making it the only option among the three suitable for 200 V DC rail protection without sacrificing recovery speed or board area.

Availability

BAV21W-7-F is available at Aetrix Electronics and suitable for AC line protection, logic-level clamping, and DC power rail polarity guard applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for BAV21W-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, specializing in high-reliability, industry-standard components for power management, signal integrity, and protection functions.

BAV21W-7-F belongs to Diodes' general-purpose switching diode product line, engineered for cost-sensitive, high-volume applications demanding proven reliability, fast switching, and broad voltage coverage in compact surface-mount packages.

FAQ

Is BAV21W-7-F suitable for automotive applications?

No-BAV21W-7-F is rated for commercial temperature range (–55°C to +150°C) but lacks AEC-Q101 qualification and PPAP documentation. For automotive use, specify BAV21WQ-7-F, which is manufactured in IATF 16949-certified facilities and qualified per AEC-Q101 standards.

What is the maximum operating temperature for continuous use?

The BAV21W-7-F has an operating junction temperature range of –55°C to +150°C. At 25°C ambient, it delivers full 250 mW power dissipation; above that, derating follows the 500 °C/W thermal resistance curve, reaching zero dissipation at 150°C junction temperature.

Does BAV21W-7-F have a specified leakage current at elevated temperature?

Yes-peak reverse current (I_RM) is specified as 15 µA at T_J = +100°C and rated DC blocking voltage (200 V), confirming stable leakage behavior under high-temperature stress conditions typical in enclosed industrial enclosures.

Can BAV21W-7-F replace 1N4148 in existing designs?

Only if reverse voltage requirements exceed 100 V. While both share SOD123 packaging and similar forward characteristics, BAV21W-7-F's 250 V V_RRM far exceeds 1N4148's 100 V rating-making it unsuitable as a direct replacement unless the circuit's reverse stress is verified below 100 V.

BAV21W-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:: 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-F FAQ

1.How can I place an order for BAV21W-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BAV21W-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 BAV21W-7-F reliable?

The price and inventory of BAV21W-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 BAV21W-7-F is usually 5 days.

3.What payment methods are accepted for BAV21W-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAV21W-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAV21W-7-F?

BAV21W-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAV21W-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 BAV21W-7-F?

For technical support, including BAV21W-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAV21W-7-F requirements.

6.How does Aetrix verify that BAV21W-7-F is sourced from the original manufacturer or authorized distributors?

All BAV21W-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 BAV21W-7-F meets industry standards.

7.What is the process for return or replacement of BAV21W-7-F?

All BAV21W-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BAV21W-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 BAV21W-7-F part is unused and in its original packaging.

Return procedure for BAV21W-7-F:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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