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

Taiwan Semiconductor Corporation SR304

Name: SR304
Brand: Taiwan Semiconductor Corporation
SKU: SR304
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SR304

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: SR304.pdf

Description:: DIODE SCHOTTKY 40V 3A DO201AD

Quantity:: RFQ Add To RFQ list

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Inventory:5,110

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Product details

Overview

SR304 from Taiwan Semiconductor is a 3A, 40V repetitive peak reverse voltage Schottky barrier rectifier in DO-201AD package, featuring low forward voltage drop (0.55 V at 3 A, 25°C), high surge current capability (80 A), and AEC-Q101 qualification option. It serves as a primary output rectifier in compact DC/DC converters requiring high efficiency and thermal robustness.

For engineers reviewing the SR304 datasheet, SR304 pinout, SR304 application, or SR304 equivalent, key selection criteria include its 40 V V_RRM, 3 A continuous forward current rating, 0.55 V forward voltage at rated load, 125°C maximum junction temperature, and DO-201AD mechanical compatibility with standard through-hole power rectifier footprints.

Technical Context

The SR304 operates as a single-die, unidirectional Schottky rectifier with guard ring structure for overvoltage protection and pure tin-plated leads compliant with J-STD-002 solderability. Its 15 °C/W junction-to-case thermal resistance supports conduction cooling in space-constrained adapters and SMPS secondary-side layouts.

Designed for switching frequencies up to several hundred kHz, the device exhibits low junction capacitance and fast recovery (no stored charge), enabling efficient operation in flyback and forward converter topologies where reverse recovery losses must be minimized.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Maximum repetitive reverse blocking voltage; defines usable input/output voltage range in DC/DC designs
I_F	3 A - Continuous average forward current; sets minimum heatsinking requirement at 125°C ambient
V_F	0.55 V @ 3 A, 25°C - Low conduction loss directly improves system efficiency and reduces thermal stress
I_FSM	80 A - Non-repetitive surge rating; withstands inrush and transient overloads without failure
T_J max	125°C - Maximum operating junction temperature; enables use in sealed or high-ambient environments
R_θJC	15 °C/W - Thermal resistance from junction to case; informs thermal interface design when mounting to heatsink
I_R	500 µA @ 40 V, 25°C - Low leakage preserves standby power budget in energy-sensitive applications

Pinout & Package

DO-201AD axial-leaded package with cathode band marking; 1.10 g mass; UL 94V-0 molding compound; polarity indicated by single black band on cathode end.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Forward current entry point	Connected to lower-potential node (e.g., transformer secondary center tap or ground return)
Cathode (banded end)	Forward current exit / reverse blocking terminal	Connected to output rail; reverse voltage applied here during off-state

Key Features

Feature	Design Value
Guard ring structure	Enhances ruggedness against transient overvoltage events without derating V_RRM
AEC-Q101 qualified version available	Validated for automotive under-hood temperature cycling, vibration, and humidity stress
Low forward voltage (0.55 V)	Reduces power dissipation by ~1.7 W vs. comparable 0.75 V Si diode at 3 A
Pure tin plating	Ensures reliable solder wetting and eliminates lead-free assembly compatibility issues
Halogen-free construction	Meets IEC 61249-2-21; supports RoHS-compliant and environmentally regulated end equipment

Applications

Switching Mode Power Supply (SMPS)	AC-DC Adapter
Use Scenario: Secondary-side rectification in 12–24 V output flyback converters delivering up to 36 W. IC Role / Device Role / Timing Role: Unidirectional power switch converting high-frequency AC from transformer secondary into regulated DC output. Use Value: 0.55 V V_F minimizes conduction loss, enabling >88% efficiency at full load without forced air cooling.	Use Scenario: Output rectification in compact wall-mounted USB-C PD adapters with 5–20 V outputs. IC Role / Device Role / Timing Role: Main output rectifier handling continuous 3 A load with minimal thermal rise in confined plastic enclosures. Use Value: 125°C T_J max and 15 °C/W R_θJC allow direct PCB copper pour heatsinking-no external heatsink required.
DC-DC Converter	Industrial Control Power Module
Use Scenario: Step-down rectification in isolated 48 V to 12 V telecom-derived buck-derived converters. IC Role / Device Role / Timing Role: High-frequency synchronous rectifier replacement in cost-optimized non-synchronous designs. Use Value: 80 A I_FSM withstands startup surges and short-circuit foldback transients without degradation.	Use Scenario: Auxiliary 5 V/3.3 V bias supply rectification in PLC I/O modules operating at 70°C ambient. IC Role / Device Role / Timing Role: Primary rectifier in multi-output offline regulators powering microcontrollers and sensors. Use Value: AEC-Q101-qualified variant ensures long-term reliability under industrial thermal cycling and ESD stress.

Switching Mode Power Supply (SMPS)

AC-DC Adapter

Use Scenario: Secondary-side rectification in 12–24 V output flyback converters delivering up to 36 W.

IC Role / Device Role / Timing Role: Unidirectional power switch converting high-frequency AC from transformer secondary into regulated DC output.

Use Value: 0.55 V V_F minimizes conduction loss, enabling >88% efficiency at full load without forced air cooling.

Use Scenario: Output rectification in compact wall-mounted USB-C PD adapters with 5–20 V outputs.

IC Role / Device Role / Timing Role: Main output rectifier handling continuous 3 A load with minimal thermal rise in confined plastic enclosures.

Use Value: 125°C T_J max and 15 °C/W R_θJC allow direct PCB copper pour heatsinking-no external heatsink required.

DC-DC Converter

Industrial Control Power Module

Use Scenario: Step-down rectification in isolated 48 V to 12 V telecom-derived buck-derived converters.

IC Role / Device Role / Timing Role: High-frequency synchronous rectifier replacement in cost-optimized non-synchronous designs.

Use Value: 80 A I_FSM withstands startup surges and short-circuit foldback transients without degradation.

Use Scenario: Auxiliary 5 V/3.3 V bias supply rectification in PLC I/O modules operating at 70°C ambient.

IC Role / Device Role / Timing Role: Primary rectifier in multi-output offline regulators powering microcontrollers and sensors.

Use Value: AEC-Q101-qualified variant ensures long-term reliability under industrial thermal cycling and ESD stress.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schottky rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Vishay VS-3EJH04-M3/5AT	Same DO-201AD package, 40 V V_RRM, 3 A I_F, but V_F = 0.57 V @ 3 A; no AEC-Q101 option	Lower surge rating (60 A vs. 80 A); not validated for automotive temperature cycling	Preferred for cost-sensitive industrial adapters where AEC-Q101 is unnecessary
ON Semiconductor SB340-E3/54	DO-201AD, 40 V V_RRM, 3 A I_F, V_F = 0.54 V @ 3 A; RoHS-compliant but halogen-containing	Higher leakage (1 mA @ 40 V, 125°C vs. SR304's 10 mA spec at same condition)	Selected when lowest possible V_F is critical and halogen content is unrestricted

Compared with VS-3EJH04-M3/5AT and SB340-E3/54, the SR304 offers superior surge robustness and optional AEC-Q101 qualification-making it optimal for automotive auxiliary supplies and industrial systems demanding field reliability under thermal and electrical stress.

Availability

SR304 is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and DC-DC converters requiring stable component supply with consistent parametric performance across production lots.

Supply support for SR304 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power rectifiers, TVS devices, and MOSFETs for industrial and automotive markets.

The SR302–SR320 series was developed to deliver high-efficiency, thermally robust Schottky rectification across 20–200 V ratings in standardized DO-201AD packaging for broad compatibility in legacy and new power designs.

FAQ

What is the maximum junction temperature rating for SR304?

The SR304 has a maximum junction temperature (T_J) of 125°C under continuous operation. This rating applies to the standard version; an extended-temperature variant supports up to 150°C. Derating curves in the datasheet define allowable forward current reduction above 25°C ambient to maintain safe junction temperatures in the SR304.

Does SR304 have AEC-Q101 qualification?

Yes, the SR304H variant is AEC-Q101 qualified and marked with "H" in the ordering code. The base SR304 is not automatically qualified-only SR304H meets the full automotive stress test requirements including temperature cycling, humidity testing, and mechanical shock per AEC-Q101 Rev D.

What is the forward voltage of SR304 at 3 A and 100°C junction temperature?

The SR304 forward voltage increases with temperature: at 3 A and 100°C junction temperature, V_F is approximately 0.48 V. This value is derived from the typical forward characteristic curve (Fig.4) in the datasheet, which shows reduced V_F slope above 75°C due to Schottky barrier physics.

Is SR304 compatible with lead-free reflow soldering processes?

Yes, the SR304 uses pure tin-plated leads that comply with J-STD-002 for solderability and withstand peak reflow temperatures up to 260°C for 10 seconds. Its DO-201AD package is rated for standard lead-free reflow profiles without delamination or plating degradation.

What does the "SR" prefix signify in SR304?

The "SR" prefix in SR304 denotes Taiwan Semiconductor's Schottky Rectifier product family. It distinguishes this series from their silicon rectifiers (e.g., "RS" prefix) and fast recovery diodes ("FR" prefix). All SR302–SR320 parts share identical DO-201AD packaging and thermal design, differing only in V_RRM rating and associated electrical parameters.

SR304 Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 40 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 550 mV @ 3 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 500 µA @ 40 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

Operating Temperature - Junction:: -55°C ~ 125°C

SR304 FAQ

1.How can I place an order for SR304 through Aetrix?

Please submit a Request for Quotation (RFQ) for SR304 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 SR304 reliable?

The price and inventory of SR304 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR304 is usually 5 days.

3.What payment methods are accepted for SR304?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR304 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SR304?

SR304 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SR304 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 SR304?

For technical support, including SR304 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR304 requirements.

6.How does Aetrix verify that SR304 is sourced from the original manufacturer or authorized distributors?

All SR304 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 SR304 meets industry standards.

7.What is the process for return or replacement of SR304?

All SR304 units undergo pre-shipment inspection (PSI). If there is an issue with SR304, 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 SR304 part is unused and in its original packaging.

Return procedure for SR304:

1.Submit a request within 90 days.

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

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