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

Taiwan Semiconductor Corporation BAV21WS R9G

Name: BAV21WS R9G
Brand: Taiwan Semiconductor Corporation
SKU: BAV21WS R9G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BAV21WS R9G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: SC-90, SOD-323F

Datasheet:: BAV21WS R9G.pdf

Description:: DIODE GP 250V 200MA SOD323F

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BAV21WS R9G from Taiwan Semiconductor is a high-voltage SMD switching diode in SOD-323F package, rated for 250 V repetitive peak reverse voltage (V_RRM), 200 mA average forward current (I_F), and 1.25 V forward voltage at 200 mA. It serves as a fast-switching rectifier in compact DC/DC converters and lighting drivers.

For engineers reviewing the BAV21WS R9G datasheet, BAV21WS R9G pinout, BAV21WS R9G application, or BAV21WS R9G equivalent, key selection criteria include verified V_RRM = 250 V, t_rr ≤ 50 ns, I_FSM = 2.5 A (1 µs), JESD201 Class 1A whisker resistance, and RoHS-compliant halogen-free green compound.

Technical Context

This discrete silicon switching diode uses a single-die planar structure optimized for high-speed recovery (t_rr ≤ 50 ns) and low forward conduction loss (V_F = 1.25 V @ 200 mA). Its 250 V V_RRM rating targets mid-range HV SMPS output stages where higher breakdown margin than BAV20WS (200 V) or BAV19WS (120 V) is required.

The SOD-323F package enables automated placement with moisture sensitivity level 1 (J-STD-020), matte tin-plated leads (J-STD-002 compliant), and UL 94V-0 molding compound - supporting reflow-soldered, space-constrained power interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	250 V - Maximum non-repetitive reverse blocking voltage before breakdown; defines safe operating range in HV flyback or boost rectification
I_F	200 mA - Continuous forward current handling; sets thermal limit for steady-state conduction in low-power adapters
t_rr	≤ 50 ns - Reverse recovery time under 30 mA IF/IR, 100 Ω load; ensures minimal switching loss in >100 kHz DC/DC topologies
V_F @ 200 mA	1.25 V - Forward voltage drop at rated current; directly impacts conduction loss and junction temperature rise
I_FSM	2.5 A (1 µs) - Non-repetitive surge current capability; supports transient overload tolerance during startup or fault events
T_J max	+150 °C - Maximum junction temperature; enables operation in thermally constrained LED driver or industrial adapter environments
C_J	≤ 5 pF @ 1 MHz, 0 V - Junction capacitance; limits high-frequency displacement current and EMI generation in fast-switching nodes

Pinout & Package

SOD-323F surface-mount package: 2-terminal, cathode-indicated by band, 2.50 mm × 1.25 mm footprint, 0.70 mm height, JEDEC SC-90 / EIAJ ED-7500A-1 compliant.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck converter); must withstand 2.5 A surge
Cathode	Forward current exit / reverse blocking terminal	Marked with band; tied to output rail or ground return; blocks up to 250 V reverse bias

Key Features

Feature	Design Value
High V_RRM = 250 V	Enables use in 24–48 V input SMPS with ≥2× safety margin against line transients
t_rr ≤ 50 ns	Reduces switching loss and ringing in 300–500 kHz DC/DC converters, improving efficiency >0.5%
JESD 201 Class 1A whisker resistance	Prevents tin whisker growth under thermal cycling, ensuring long-term reliability in automotive-grade modules
Halogen-free green compound (IEC 61249-2-21)	Meets environmental compliance for consumer electronics and industrial equipment without compromising flame retardancy (UL 94V-0)
Moisture sensitivity level 1	Eliminates bake requirement prior to reflow, reducing manufacturing cost and process complexity

Applications

LED Lighting Driver	USB-C PD Adapter Output Rectification
Use Scenario: High-efficiency constant-current LED driver operating from 24–48 V DC input with 200–500 kHz switching frequency. IC Role / Device Role / Timing Role: Fast-recovery output rectifier replacing Schottky diodes where 250 V V_RRM prevents avalanche failure during output overvoltage events. Use Value: Enables smaller heatsink design due to 1.25 V V_F and 50 ns t_rr, reducing system size while maintaining >92% efficiency at full load.	Use Scenario: Secondary-side synchronous rectification replacement in compact 30–65 W USB-C power adapters. IC Role / Device Role / Timing Role: Low-cost, high-reliability discrete rectifier in flyback or active-clamp forward topologies requiring 250 V blocking. Use Value: Delivers consistent 2.5 A surge immunity and JESD201 Class 1A reliability across 1000+ thermal cycles, extending product lifetime beyond 5 years.
On-board 12 V DC/DC Converter	Industrial Sensor Power Supply
Use Scenario: Isolated 24 V-to-12 V DC/DC module embedded in PLC I/O modules with space constraints. IC Role / Device Role / Timing Role: Input-side clamp or output rectifier handling 200 mA continuous load with transient surges up to 2.5 A. Use Value: SOD-323F footprint saves >40% board area vs. SOD-123, enabling dense integration without sacrificing 250 V isolation margin.	Use Scenario: Field-powered 4–20 mA loop-powered sensor with integrated DC/DC for analog front-end and MCU. IC Role / Device Role / Timing Role: Reverse-polarity protection and transient clamping diode on 24 V supply rail. Use Value: 250 V V_RRM and -65 °C to +150 °C TJ range ensure robust operation in uncontrolled ambient environments (e.g., factory floors).

LED Lighting Driver

USB-C PD Adapter Output Rectification

Use Scenario: High-efficiency constant-current LED driver operating from 24–48 V DC input with 200–500 kHz switching frequency.

IC Role / Device Role / Timing Role: Fast-recovery output rectifier replacing Schottky diodes where 250 V V_RRM prevents avalanche failure during output overvoltage events.

Use Value: Enables smaller heatsink design due to 1.25 V V_F and 50 ns t_rr, reducing system size while maintaining >92% efficiency at full load.

Use Scenario: Secondary-side synchronous rectification replacement in compact 30–65 W USB-C power adapters.

IC Role / Device Role / Timing Role: Low-cost, high-reliability discrete rectifier in flyback or active-clamp forward topologies requiring 250 V blocking.

Use Value: Delivers consistent 2.5 A surge immunity and JESD201 Class 1A reliability across 1000+ thermal cycles, extending product lifetime beyond 5 years.

On-board 12 V DC/DC Converter

Industrial Sensor Power Supply

Use Scenario: Isolated 24 V-to-12 V DC/DC module embedded in PLC I/O modules with space constraints.

IC Role / Device Role / Timing Role: Input-side clamp or output rectifier handling 200 mA continuous load with transient surges up to 2.5 A.

Use Value: SOD-323F footprint saves >40% board area vs. SOD-123, enabling dense integration without sacrificing 250 V isolation margin.

Use Scenario: Field-powered 4–20 mA loop-powered sensor with integrated DC/DC for analog front-end and MCU.

IC Role / Device Role / Timing Role: Reverse-polarity protection and transient clamping diode on 24 V supply rail.

Use Value: 250 V V_RRM and -65 °C to +150 °C TJ range ensure robust operation in uncontrolled ambient environments (e.g., factory floors).

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ON Semiconductor MMBD253L	V_RRM = 250 V, t_rr = 50 ns, but I_F = 100 mA (half of BAV21WS R9G)	Not suitable for 200 mA continuous loads; limited to signal-level or low-current clamp roles	Select only if current demand <100 mA and same SOD-323F footprint is mandatory
Vishay VS-2EDH02-M3/84A	V_RRM = 200 V, I_F = 200 mA, t_rr = 35 ns - lower V_RRM but faster recovery	Acceptable only where 200 V margin suffices (e.g., 12–24 V systems); not for 48 V+ inputs	Choose when t_rr priority outweighs V_RRM margin, and system max reverse stress ≤ 200 V

Compared with MMBD253L and VS-2EDH02-M3/84A, BAV21WS R9G uniquely balances 250 V blocking, 200 mA current, and 50 ns recovery in SOD-323F - making it the only option qualified for 48 V-input SMPS rectification with full-rated current and industrial temperature range.

Availability

BAV21WS R9G is available at Aetrix Electronics and suitable for switching mode power supplies, LED lighting drivers, and on-board DC/DC converters requiring stable component supply, halogen-free compliance, and JESD201 Class 1A reliability.

Supply support for BAV21WS R9G 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, analog ICs, and optoelectronics for industrial, computing, and consumer markets.

The BAV21WS R9G belongs to TSC's high-voltage SMD switching diode family, designed specifically for compact, high-efficiency AC/DC and DC/DC power conversion where reliability, surge robustness, and RoHS/halogen-free compliance are mandatory.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for BAV21WS R9G?

The BAV21WS R9G has a guaranteed V_RRM of 250 V, as specified in Taiwan Semiconductor's official datasheet (Version K2212, Page 2). This value is tested per JEDEC standards and applies across the full operating temperature range (-65 °C to +150 °C). The BAV21WS R9G is the highest-voltage variant in the BAV19WS/BAV20WS/BAV21WS series, distinguishing it from BAV20WS (200 V) and BAV19WS (120 V).

Is BAV21WS R9G halogen-free and RoHS compliant?

Yes, BAV21WS R9G is halogen-free per IEC 61249-2-21 and RoHS compliant. The "G" suffix in the ordering code explicitly denotes green compound - confirmed in the Ordering Information table (Page 2 of datasheet K2212). The SOD-323F molding compound meets UL 94V-0 flammability rating and contains no brominated flame retardants or chlorine-based additives.

What is the reverse recovery time (t_rr) of BAV21WS R9G and under what test conditions?

The BAV21WS R9G has a maximum reverse recovery time (t_rr) of 50 ns, measured under standardized conditions: I_F = I_R = 30 mA, R_L = 100 Ω, and I_rr = 3 mA (Datasheet Page 2, Electrical Specifications). This value is typical for fast-switching silicon diodes and enables efficient operation in DC/DC converters switching above 200 kHz.

Does BAV21WS R9G have moisture sensitivity level (MSL) rating, and what does it mean for assembly?

BAV21WS R9G has Moisture Sensitivity Level 1 per J-STD-020 - the least stringent rating. This means the device can be stored indefinitely at ≤30 °C/60% RH and requires no baking prior to reflow soldering. The MSL-1 rating simplifies SMT line logistics and eliminates yield risk from popcorning during lead-free reflow profiles.

What is the marking code for BAV21WS R9G on the SOD-323F package?

The marking code for BAV21WS R9G is "S7", laser-etched on the top surface of the SOD-323F package (Datasheet Page 2, Absolute Maximum Ratings table). This distinguishes it from BAV20WS (S6) and BAV19WS (S5). The cathode is indicated by a visible band adjacent to the marked side.

BAV21WS R9G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: SC-90, SOD-323F

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 250 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:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOD-323F

Operating Temperature - Junction:: -65°C ~ 150°C

BAV21WS R9G FAQ

1.How can I place an order for BAV21WS R9G through Aetrix?

Please submit a Request for Quotation (RFQ) for BAV21WS R9G 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 BAV21WS R9G reliable?

The price and inventory of BAV21WS R9G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BAV21WS R9G is usually 5 days.

3.What payment methods are accepted for BAV21WS R9G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAV21WS R9G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAV21WS R9G?

BAV21WS R9G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAV21WS R9G 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 BAV21WS R9G?

For technical support, including BAV21WS R9G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAV21WS R9G requirements.

6.How does Aetrix verify that BAV21WS R9G is sourced from the original manufacturer or authorized distributors?

All BAV21WS R9G 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 BAV21WS R9G meets industry standards.

7.What is the process for return or replacement of BAV21WS R9G?

All BAV21WS R9G units undergo pre-shipment inspection (PSI). If there is an issue with BAV21WS R9G, 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 BAV21WS R9G part is unused and in its original packaging.

Return procedure for BAV21WS R9G:

1.Submit a request within 90 days.

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

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