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

Taiwan Semiconductor Corporation SR109

Name: SR109
Brand: Taiwan Semiconductor Corporation
SKU: SR109
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SR109

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: SR109.pdf

Description:: DIODE SCHOTTKY 90V 1A DO204AL

Quantity:: RFQ Add To RFQ list

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Inventory:9,126

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Product details

Overview

SR109 from Taiwan Semiconductor is a 1 A, 90 V repetitive peak reverse voltage Schottky barrier rectifier in DO-204AL (DO-41) package, featuring 0.85 V forward voltage at 1 A and 100 µA reverse leakage at 25°C, used in compact DC-DC converters and AC adapters.

For engineers reviewing the SR109 datasheet, SR109 pinout, SR109 application, or SR109 equivalent, key selection factors include its 90 V V_RRM, 30 A surge rating, 125°C/150°C junction temperature range, AEC-Q101 qualification option (SR109H), and thermal resistance of 90°C/W.

Technical Context

This single-die Schottky rectifier operates with low conduction loss due to its metal-semiconductor junction, enabling high efficiency in high-frequency switching topologies. Its guard ring structure enhances ruggedness against transient overvoltage events.

The device supports continuous forward current up to 1 A at ambient temperatures ≤75°C, derating linearly to zero at 150°C junction temperature, and withstands 8.3 ms half-sine surge currents up to 30 A without failure.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	90 V - maximum repetitive reverse blocking voltage before breakdown
I_F	1 A - continuous average forward current under specified thermal conditions
V_F @ 1 A, 25°C	0.85 V - forward conduction loss directly impacts power stage efficiency
I_R @ 90 V, 25°C	100 µA - low leakage preserves standby power in energy-sensitive designs
I_FSM	30 A - non-repetitive surge capability for inrush and fault tolerance
T_J max	125°C / 150°C - dual-rated junction temperature enables flexible thermal design margin
R_θJA	90°C/W - thermal resistance defines required heatsinking for 1 A operation

Pinout & Package

DO-204AL (DO-41) axial-leaded package with cathode indicated by a band; leads are pure tin plated, solderable per J-STD-002, UL 94V-0 molded compound, 0.330 g typical weight.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side (e.g., switch node in buck converter)
Cathode	Forward current exit point	Connected to output rail; polarity marked by band on body

Key Features

Feature	Design Value
Low forward voltage drop	0.85 V @ 1 A reduces conduction loss and improves system efficiency
Guard ring protection	Enhances dv/dt immunity and prevents premature avalanche failure
AEC-Q101 qualification option	SR109H variant meets automotive reliability requirements for under-hood use
High surge current capability	30 A I_FSM supports robust operation during input transients and startup
Halogen-free construction	Complies with IEC 61249-2-21 for environmentally regulated end equipment

Applications

AC-DC Adapters	DC-DC Converters
Use Scenario: Secondary-side rectification in 5–24 V wall adapters for consumer electronics. IC Role / Device Role / Timing Role: Schottky rectifier replacing conventional PN diodes to minimize voltage drop and heat generation. Use Value: 0.85 V V_F enables >92% efficiency at light-to-moderate loads versus ~0.95 V alternatives.	Use Scenario: Output rectification in isolated flyback or forward converters for industrial sensors. IC Role / Device Role / Timing Role: Unidirectional current path with fast recovery for high-frequency switching (≥100 kHz). Use Value: 30 A surge rating handles repeated load-step transients without degradation.
Switching Power Supplies	Automotive Infotainment
Use Scenario: Main output rectifier in 12 V/1 A SMPS for networking equipment. IC Role / Device Role / Timing Role: Primary power conversion element defining thermal and efficiency boundaries. Use Value: 90°C/W R_θJA allows operation at full 1 A with minimal PCB copper area.	Use Scenario: 12 V rail rectification in head unit power stages meeting AEC-Q101. IC Role / Device Role / Timing Role: Qualified rectifier for automotive-grade power subsystems requiring extended temperature operation. Use Value: SR109H variant supports 150°C T_J and passes JESD201 Class 2 whisker testing.

AC-DC Adapters

DC-DC Converters

Use Scenario: Secondary-side rectification in 5–24 V wall adapters for consumer electronics.

IC Role / Device Role / Timing Role: Schottky rectifier replacing conventional PN diodes to minimize voltage drop and heat generation.

Use Value: 0.85 V V_F enables >92% efficiency at light-to-moderate loads versus ~0.95 V alternatives.

Use Scenario: Output rectification in isolated flyback or forward converters for industrial sensors.

IC Role / Device Role / Timing Role: Unidirectional current path with fast recovery for high-frequency switching (≥100 kHz).

Use Value: 30 A surge rating handles repeated load-step transients without degradation.

Switching Power Supplies

Automotive Infotainment

Use Scenario: Main output rectifier in 12 V/1 A SMPS for networking equipment.

IC Role / Device Role / Timing Role: Primary power conversion element defining thermal and efficiency boundaries.

Use Value: 90°C/W R_θJA allows operation at full 1 A with minimal PCB copper area.

Use Scenario: 12 V rail rectification in head unit power stages meeting AEC-Q101.

IC Role / Device Role / Timing Role: Qualified rectifier for automotive-grade power subsystems requiring extended temperature operation.

Use Value: SR109H variant supports 150°C T_J and passes JESD201 Class 2 whisker testing.

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-1EWH09-M3/54	Same DO-41 package, 90 V V_RRM, 0.83 V V_F @ 1 A, but rated only to 125°C T_J	Lacks AEC-Q101 option; not qualified for automotive under-hood use	Preferred where cost sensitivity outweighs automotive qualification needs
ON Semiconductor SB190	DO-41, 90 V V_RRM, 0.87 V V_F @ 1 A, 150°C T_J, but higher 200 µA I_R @ 25°C	Higher leakage may impact ultra-low-power standby performance	Acceptable where thermal margin is prioritized over leakage-critical standby modes

Compared with VS-1EWH09-M3/54 and SB190, the SR109 offers balanced trade-offs: lower leakage than SB190 (100 µA vs. 200 µA), AEC-Q101 availability (unlike VS-1EWH09), and identical 90 V/1 A ratings-making it optimal for automotive-adjacent industrial power supplies requiring reliability and efficiency.

Availability

SR109 is available at Aetrix Electronics and suitable for AC-DC adapters, DC-DC converters, and switching power supplies requiring stable component supply across industrial and automotive-tier programs.

Supply support for SR109 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 industrial, computing, and automotive markets since 1979.

The SR102–SR115 series was designed specifically for high-efficiency, space-constrained secondary-side rectification in medium-power SMPS, emphasizing low V_F, rugged surge handling, and qualification-ready variants.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for SR109?

The SR109 has a V_RRM of 90 V, meaning it can reliably block up to 90 V of reverse voltage in repetitive operation without breakdown. This rating is confirmed in the Absolute Maximum Ratings table of the G2104 datasheet and applies across the full operating temperature range. Exceeding this voltage risks irreversible avalanche failure. The SR109 is part of a family spanning 20 V to 150 V, with SR109 specifically designated for 90 V applications.

Does SR109 have AEC-Q101 qualification?

The base SR109 is not AEC-Q101 qualified, but the SR109H variant is explicitly listed in the Ordering Information as AEC-Q101 qualified. The "H" suffix denotes automotive-grade screening and testing per AEC-Q101 Rev D. Users requiring automotive compliance must specify SR109H-not SR109-to ensure qualification. Both share identical electrical parameters and DO-41 packaging.

What is the forward voltage (V_F) of SR109 at 1 A and 25°C?

The SR109 exhibits a typical forward voltage of 0.85 V at 1 A and 25°C, as specified in the Electrical Specifications table under "Forward voltage(1)" for SR109/SR110. This value is measured using a 0.3 ms pulse test and directly determines conduction loss in power stages. At elevated junction temperatures (e.g., 125°C), V_F decreases slightly, improving efficiency under thermal stress.

What is the reverse leakage current (I_R) of SR109 at rated voltage and 25°C?

The SR109 has a maximum reverse leakage current of 100 µA at 90 V and 25°C, per the Electrical Specifications table. This low leakage supports efficient standby operation in energy-sensitive applications such as USB-C adapters and IoT power supplies. At 125°C and 90 V, leakage rises to 2 mA-still within safe operational limits for most industrial designs.

What package type does SR109 use, and what are its mechanical features?

The SR109 uses the DO-204AL (DO-41) axial-leaded package, with pure tin-plated leads compliant with J-STD-002 solderability, UL 94V-0 flammability-rated molding compound, and cathode polarity indicated by a band. Its 0.330 g weight and standardized dimensions enable compatibility with legacy through-hole assembly lines and automated tape-and-reel handling (5,000 pcs/reel).

SR109 Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-204AL, DO-41, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

Voltage - DC Reverse (Vr) (Max):: 90 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 850 mV @ 1 A

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

Reverse Recovery Time (trr):: -

Current - Reverse Leakage @ Vr:: 100 µA @ 90 V

Capacitance @ Vr, F:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AL (DO-41)

Operating Temperature - Junction:: -55°C ~ 150°C

SR109 FAQ

1.How can I place an order for SR109 through Aetrix?

Please submit a Request for Quotation (RFQ) for SR109 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 SR109 reliable?

The price and inventory of SR109 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR109 is usually 5 days.

3.What payment methods are accepted for SR109?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR109 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SR109?

SR109 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SR109 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 SR109?

For technical support, including SR109 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR109 requirements.

6.How does Aetrix verify that SR109 is sourced from the original manufacturer or authorized distributors?

All SR109 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 SR109 meets industry standards.

7.What is the process for return or replacement of SR109?

All SR109 units undergo pre-shipment inspection (PSI). If there is an issue with SR109, 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 SR109 part is unused and in its original packaging.

Return procedure for SR109:

1.Submit a request within 90 days.

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

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