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

Diodes Incorporated BAS21W-7-F

Name: BAS21W-7-F
Brand: Diodes Incorporated
SKU: BAS21W-7-F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BAS21W-7-F

Manufacturer:: Diodes Incorporated

Category:: Single Diodes

Package:: SC-70, SOT-323

Datasheet:: BAS21W-7-F.pdf

Description:: DIODE GEN PURP 200V 200MA SOT323

Quantity:: RFQ Add To RFQ list

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Inventory:16,034

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Product details

Overview

BAS21W-7-F from Diodes Incorporated is a surface-mount high-voltage switching diode in SOT323 package, featuring 250 V repetitive peak reverse voltage (V_RRM), 200 mA average rectified current (I_O), and 50 ns reverse recovery time (t_RR). It serves as a fast-switching general-purpose diode in DC-DC converter flyback snubbers, signal clamping, and high-voltage logic interface protection circuits.

For engineers reviewing the BAS21W-7-F datasheet, BAS21W-7-F pinout, BAS21W-7-F application, or BAS21W-7-F equivalent, key selection criteria include verified V_RRM = 250 V, t_RR ≤ 50 ns, I_O = 200 mA, thermal resistance R_θJA = 625 °C/W, and SOT323 footprint compatibility with automated PCB assembly.

Technical Context

This diode employs a planar epitaxial silicon structure optimized for high-voltage blocking and fast minority-carrier recombination. Its 250 V V_RRM rating enables use in 200 V DC-blocking paths, while the 50 ns t_RR supports switching frequencies up to ~10 MHz in non-resonant topologies.

Thermal performance is defined by a 200 mW power dissipation limit and 625 °C/W junction-to-ambient resistance under standard FR-4 mounting. The device exhibits low leakage-15 µA at 100 °C and rated VR-making it suitable for temperature-stable bias networks.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	250 V - Supports DC blocking in 200 V rail systems with 25% safety margin
t_RR	50 ns - Enables clean turn-off in 1–10 MHz switching applications without tail current
I_O	200 mA - Sustains continuous forward current in low-power signal routing and clamp paths
V_F	1.25 V @ 200 mA - Low conduction loss in series protection or level-shifting configurations
R_θJA	625 °C/W - Requires minimal copper area for thermal management on standard FR-4
C_T	5.0 pF @ 0 V - Minimizes capacitive loading in high-impedance timing or RF-coupled nodes

Pinout & Package

Package: SOT323 - 3-terminal surface-mount plastic package (2.15 mm × 2.10 mm × 0.95 mm), moisture sensitivity level 1, lead-free matte tin plating over Alloy 42 leadframe.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Forward current entry	Connected to lower-potential node in clamping or rectification path
Cathode (Pin 2)	Forward current exit / reverse voltage reference	Typically tied to higher-potential rail or ground return in protection circuits
NC (Pin 3)	No internal connection	Unused terminal; electrically isolated and may be left unconnected or grounded per layout

Key Features

Feature	Design Value
High-voltage blocking	250 V V_RRM enables direct use in 200 V industrial control inputs without external voltage dividers
Fast switching	50 ns t_RR ensures minimal switching loss and reduced EMI in high-frequency signal routing
Low leakage at temperature	15 µA IR at +100 °C maintains accuracy in precision bias and sensing circuits
Automated assembly compatibility	SOT323 footprint aligns with IPC-7351B standard for reliable pick-and-place yield

Applications

DC-DC Converter Snubber

Logic-Level Clamping

Use Scenario: Suppresses voltage spikes across MOSFET drains in flyback and buck-boost converters operating up to 200 kHz.

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

Use Value: 50 ns t_RR prevents reverse recovery oscillation; 250 V V_RRM withstands reflected primary-side transients.

Use Scenario: Protects 3.3 V/5 V microcontroller GPIO pins from 12 V or 24 V field signals in industrial I/O modules.

IC Role / Device Role / Timing Role: Bidirectional voltage limiter clamping input to safe logic thresholds.

Use Value: Low 5.0 pF C_T avoids signal edge degradation; 1.25 V V_F ensures tight clamping window.

High-Voltage Signal Routing

Power Supply OR-ing

Use Scenario: Routes analog sensor outputs across isolated domains where common-mode voltage exceeds 100 V.

IC Role / Device Role / Timing Role: High-impedance series switch enabling bidirectional AC coupling with DC blocking.

Use Value: 200 V VRWM provides stable DC offset rejection; 625 °C/W R_θJA allows operation without heatsinking.

Use Scenario: Implements diode-OR redundancy between dual 12 V power supplies in telecom line cards.

IC Role / Device Role / Timing Role: Low-loss forward path with minimal voltage drop in parallel supply paths.

Use Value: 1.25 V V_F at 200 mA limits insertion loss; SOT323 enables dense dual-diode placement.

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
MMBD2102-7-F	V_RRM = 200 V, t_RR = 50 ns, same SOT323 package	Limited to ≤150 V DC-blocking; unsuitable for 200 V systems	Select when 200 V rating suffices and cost optimization is prioritized
BAS21-03W	V_RRM = 250 V, t_RR = 50 ns, but in SOD-323 (slightly larger) package	Different land pattern; requires PCB redesign for footprint compatibility	Choose only if SOD-323 is already standardized in production

Compared with MMBD2102-7-F and BAS21-03W, BAS21W-7-F uniquely delivers 250 V blocking in the compact SOT323 footprint with verified 50 ns switching-enabling direct replacement in space-constrained 200 V designs without layout change or derating.

Availability

BAS21W-7-F is available at Aetrix Electronics and suitable for DC-DC converter snubbers, logic-level clamping, and high-voltage signal routing requiring stable component supply across industrial automation, telecom power systems, and embedded sensor interfaces.

Supply support for BAS21W-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 BAS21W series belongs to Diodes' high-voltage switching diode product line, engineered specifically for fast transient suppression and reliable DC blocking in space-constrained industrial and automotive-adjacent applications.

FAQ

What is the maximum junction temperature for BAS21W-7-F?

The device is rated for an operating junction temperature range of –55 °C to +150 °C. At ambient temperatures above +85 °C, power dissipation must be derated linearly per the 625 °C/W thermal resistance curve, reaching zero dissipation at +150 °C junction temperature.

Is BAS21W-7-F qualified for automotive applications?

No-BAS21W-7-F is a standard-qualification part. For automotive use, Diodes offers the AEC-Q101-qualified BAS21WQ variant, which undergoes additional stress testing and is manufactured in IATF 16949-certified facilities.

Can BAS21W-7-F replace BAS21 in through-hole designs?

No-it is not a direct replacement due to package mismatch: BAS21 uses DO-35 glass axial package, while BAS21W-7-F uses SOT323 surface-mount. Layout redesign and solder process validation are required for migration.

What is the typical reverse recovery charge (Q_rr) of BAS21W-7-F?

Q_rr is not specified in the DS30118 datasheet. However, with t_RR = 50 ns and I_R = 30 mA under standard test conditions, Q_rr is estimated at ≤1.5 nC-consistent with fast-switching diodes in this voltage class.

BAS21W-7-F Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SC-70, SOT-323

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 200 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:: SOT-323

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

BAS21W-7-F FAQ

1.How can I place an order for BAS21W-7-F through Aetrix?

Please submit a Request for Quotation (RFQ) for BAS21W-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 BAS21W-7-F reliable?

The price and inventory of BAS21W-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 BAS21W-7-F is usually 5 days.

3.What payment methods are accepted for BAS21W-7-F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BAS21W-7-F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BAS21W-7-F?

BAS21W-7-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BAS21W-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 BAS21W-7-F?

For technical support, including BAS21W-7-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BAS21W-7-F requirements.

6.How does Aetrix verify that BAS21W-7-F is sourced from the original manufacturer or authorized distributors?

All BAS21W-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 BAS21W-7-F meets industry standards.

7.What is the process for return or replacement of BAS21W-7-F?

All BAS21W-7-F units undergo pre-shipment inspection (PSI). If there is an issue with BAS21W-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 BAS21W-7-F part is unused and in its original packaging.

Return procedure for BAS21W-7-F:

1.Submit a request within 90 days.

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

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