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

Taiwan Semiconductor Corporation SR302

Name: SR302
Brand: Taiwan Semiconductor Corporation
SKU: SR302
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SR302

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: SR302.pdf

Description:: DIODE SCHOTTKY 20V 3A DO201AD

Quantity:: RFQ Add To RFQ list

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Inventory:9,975

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Product details

Overview

SR302 from Taiwan Semiconductor is a 3 A, 20 V Schottky barrier rectifier in DO-201AD package, featuring 0.55 V max forward voltage at 3 A and 25 °C, 80 A non-repetitive surge current capability, and AEC-Q101 qualification option (SR302H). It serves as a primary output rectifier in low-voltage DC–DC converters.

For engineers reviewing the SR302 datasheet, SR302 pinout, SR302 application, or SR302 equivalent, key selection criteria include its 20 V V_RRM, low VF for high-efficiency 5–12 V power rails, DO-201AD thermal performance (R_θJA = 50 °C/W), and junction temperature rating up to +125 °C.

Technical Context

The SR302 is a single-die, unidirectional Schottky rectifier optimized for high-frequency switching applications. Its guard ring structure provides overvoltage protection, and it delivers low conduction loss with a typical VF of ≤0.55 V at rated current and room temperature.

It operates within a junction temperature range of –55 °C to +125 °C (standard version), supports 80 A surge current per 8.3 ms half-sine wave, and exhibits R_θJC = 15 °C/W for effective heat transfer to the PCB pad or heatsink.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	20 V - Maximum repetitive reverse voltage; defines safe blocking capability in 5–12 V output circuits.
I_F	3 A - Continuous average forward current; supports sustained load delivery in compact SMPS designs.
V_F (max)	0.55 V @ 3 A, 25 °C - Low conduction loss enables >92% efficiency in 5 V/3 A buck converter outputs.
I_FSM	80 A - Peak non-repetitive surge current; withstands inrush and transient overloads without failure.
T_J (max)	+125 °C - Maximum operating junction temperature; allows use in sealed or thermally constrained enclosures.
R_θJA	50 °C/W - Junction-to-ambient thermal resistance; requires ≥100 mm² copper pour for full 3 A derating at 70 °C ambient.
I_R (max)	500 µA @ 20 V, 25 °C - Low leakage preserves standby power in always-on systems.

Pinout & Package

DO-201AD axial-leaded package with cathode band marking; leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Input current entry point	Connected to switch node or transformer secondary; must handle full 3 A RMS and 80 A surge.
Cathode	Output current exit point	Connected to output filter capacitor and load; polarity marked by visible band on body.

Key Features

Feature	Design Value
Guard ring structure	Enhances ruggedness against voltage transients and improves dv/dt immunity (10,000 V/µs).
AEC-Q101 qualified variant (SR302H)	Validated for automotive under-hood applications including infotainment power supplies.
UL 94V-0 molding compound	Meets flame-retardant safety requirements for enclosed industrial and medical-grade adapters.
Halogen-free construction	Complies with IEC 61249-2-21; eliminates brominated flame retardants for RoHS and WEEE compliance.

Applications

Switching Mode Power Supply (SMPS)	AC–DC Adapter
Use Scenario: Primary-side synchronous rectification in 5–12 V, 36 W flyback converters. IC Role / Device Role / Timing Role: Output rectifier replacing conventional PN diodes to reduce conduction loss. Use Value: 0.55 V VF cuts rectifier power loss by ~40% vs. 0.9 V Si diode, improving full-load efficiency by 2–3%.	Use Scenario: Secondary-side rectification in universal-input wall adapters (90–264 V AC input). IC Role / Device Role / Timing Role: Low-loss freewheeling path during MOSFET off-time in quasi-resonant topology. Use Value: 80 A I_FSM handles startup surges without derating; DO-201AD enables manual or auto-insertion in legacy adapter PCBs.
DC–DC Converter	Industrial Control Module
Use Scenario: Point-of-load (POL) rectification in 3.3 V/5 V buck-derived rails for FPGA or MCU subsystems. IC Role / Device Role / Timing Role: High-frequency rectifier synchronized with 300–500 kHz switching frequency. Use Value: Low junction capacitance (<100 pF) minimizes switching loss and EMI generation at high frequencies.	Use Scenario: Auxiliary 12 V supply rectification in PLC I/O modules operating at –40 °C to +85 °C ambient. IC Role / Device Role / Timing Role: Reliable power conversion element with –55 °C to +125 °C T_J range. Use Value: 500 µA max reverse leakage at 25 °C ensures stable bias networks and low standby current in always-on control logic.

Switching Mode Power Supply (SMPS)

AC–DC Adapter

Use Scenario: Primary-side synchronous rectification in 5–12 V, 36 W flyback converters.

IC Role / Device Role / Timing Role: Output rectifier replacing conventional PN diodes to reduce conduction loss.

Use Value: 0.55 V VF cuts rectifier power loss by ~40% vs. 0.9 V Si diode, improving full-load efficiency by 2–3%.

Use Scenario: Secondary-side rectification in universal-input wall adapters (90–264 V AC input).

IC Role / Device Role / Timing Role: Low-loss freewheeling path during MOSFET off-time in quasi-resonant topology.

Use Value: 80 A I_FSM handles startup surges without derating; DO-201AD enables manual or auto-insertion in legacy adapter PCBs.

DC–DC Converter

Industrial Control Module

Use Scenario: Point-of-load (POL) rectification in 3.3 V/5 V buck-derived rails for FPGA or MCU subsystems.

IC Role / Device Role / Timing Role: High-frequency rectifier synchronized with 300–500 kHz switching frequency.

Use Value: Low junction capacitance (<100 pF) minimizes switching loss and EMI generation at high frequencies.

Use Scenario: Auxiliary 12 V supply rectification in PLC I/O modules operating at –40 °C to +85 °C ambient.

IC Role / Device Role / Timing Role: Reliable power conversion element with –55 °C to +125 °C T_J range.

Use Value: 500 µA max reverse leakage at 25 °C ensures stable bias networks and low standby current in always-on control logic.

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-3EWH02-M3/54	Same DO-201AD package, 20 V V_RRM, 3 A I_F, but VF = 0.49 V (typ) at 3 A - 60 mV lower than SR302.	Higher efficiency at light loads due to lower VF; no AEC-Q101 variant available.	Select when maximizing light-load efficiency is critical and automotive qualification is not required.
ON Semiconductor SB320-E3/54	DO-201AD, 20 V, 3 A, VF = 0.52 V (max) at 3 A; TJ max = +125 °C; no guard ring or AEC-Q101 option.	Lacks overvoltage protection structure; suitable for cost-sensitive consumer adapters only.	Select for non-automotive, non-industrial applications where surge robustness is secondary to BOM cost.

Compared with VS-3EWH02-M3/54 and SB320-E3/54, the SR302 offers verified guard ring protection and AEC-Q101 availability (as SR302H), making it preferred for automotive and industrial environments where reliability under voltage stress is mandatory.

Availability

SR302 is available at Aetrix Electronics and suitable for switching mode power supplies, AC–DC adapters, and DC–DC converters requiring stable component supply and long-term manufacturability.

Supply support for SR302 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, serving global power and protection markets since 1979.

The SR302 belongs to TSC's SR3xx Schottky rectifier family, engineered for high-efficiency, high-reliability rectification in compact, thermally demanding power conversion stages.

FAQ

What is the maximum junction temperature rating for the SR302?

The SR302 has a maximum junction temperature (T_J) rating of +125 °C under continuous operation. This value is confirmed in the Absolute Maximum Ratings table and applies to the standard version. Derating curves in the datasheet define allowable current reduction above 25 °C ambient to maintain this limit. The SR302 must not exceed +125 °C at the die level during operation to ensure reliability and lifetime compliance.

Does the SR302 have AEC-Q101 qualification?

The base SR302 is not AEC-Q101 qualified; however, the SR302H variant is explicitly listed as AEC-Q101 qualified in the Ordering Information section. The "H" suffix denotes automotive-grade screening and testing per AEC-Q101 Rev D. For automotive applications requiring qualification, SR302H-not SR302-must be specified and sourced.

What is the forward voltage drop of the SR302 at 3 A and 25 °C?

The SR302 has a maximum forward voltage (V_F) of 0.55 V at 3 A and 25 °C, as specified in the Electrical Specifications table. This value is measured under pulse test conditions (PW = 0.3 ms) and represents the upper limit for production units. Typical units measure lower, but design margining must use the 0.55 V max value for worst-case thermal and efficiency calculations.

Which package does the SR302 use, and what are its mechanical features?

The SR302 uses the DO-201AD axial-leaded package. Key mechanical features include UL 94V-0 flammability-rated molding compound, pure tin-plated leads compliant with J-STD-002 solderability, JESD201 Class 2 whisker resistance, and cathode polarity indicated by a visible band. Its weight is approximately 1.10 g.

How does the SR302 compare to higher-voltage variants like SR305 or SR310 in terms of forward voltage?

The SR302 has a lower maximum forward voltage (0.55 V) than SR305 (0.70 V) and SR310 (0.85 V) at 3 A and 25 °C. This reflects the trade-off between breakdown voltage and series resistance in Schottky design: lower V_RRM devices achieve lower VF. Therefore, SR302 is optimal for 20 V-class applications where minimal conduction loss is prioritized over higher blocking capability.

SR302 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):: 20 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 @ 20 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

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

SR302 FAQ

1.How can I place an order for SR302 through Aetrix?

Please submit a Request for Quotation (RFQ) for SR302 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 SR302 reliable?

The price and inventory of SR302 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR302 is usually 5 days.

3.What payment methods are accepted for SR302?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR302 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SR302?

SR302 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SR302 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 SR302?

For technical support, including SR302 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR302 requirements.

6.How does Aetrix verify that SR302 is sourced from the original manufacturer or authorized distributors?

All SR302 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 SR302 meets industry standards.

7.What is the process for return or replacement of SR302?

All SR302 units undergo pre-shipment inspection (PSI). If there is an issue with SR302, 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 SR302 part is unused and in its original packaging.

Return procedure for SR302:

1.Submit a request within 90 days.

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

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