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

Taiwan Semiconductor Corporation SRAS2040H

Name: SRAS2040H
Brand: Taiwan Semiconductor Corporation
SKU: SRAS2040H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SRAS2040H

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: SRAS2040H.pdf

Description:: DIODE SCHOTTKY 40V 20A TO263AB

Quantity:: RFQ Add To RFQ list

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Inventory:7,924

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Product details

Overview

SRAS2040H from Taiwan Semiconductor is a 20A, 40V AEC-Q101-qualified Schottky barrier rectifier in TO-263AB (D2PAK) package, featuring 0.57V forward voltage at 20A/25°C, 330A surge capability, and 1.5°C/W junction-to-case thermal resistance. It serves as a low-loss freewheeling or reverse-battery protection diode in automotive DC/DC converters.

For engineers reviewing the SRAS2040H datasheet, SRAS2040H pinout, SRAS2040H application, or SRAS2040H equivalent, key selection criteria include its 40V V_RRM, 20A continuous forward current, AEC-Q101 qualification, moisture sensitivity level 1 rating, and TO-263AB thermal performance for high-efficiency power conversion designs.

Technical Context

The SRAS2040H employs a single-die Schottky structure optimized for low forward voltage and fast switching, with guard ring design enhancing overvoltage robustness. Its 1.5°C/W R_θJC enables effective heat transfer to the PCB copper plane in surface-mount power applications.

Rated for -55°C to +150°C junction operation and compliant with JESD201 Class 2 whisker testing, it supports automotive-grade reliability under transient thermal stress and mechanical vibration conditions typical of car lighting and battery protection circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Maximum repetitive reverse voltage before breakdown; defines safe operating range in 12–24V automotive systems
I_F	20 A - Continuous forward current rating at case temperature ≤ 115°C; supports high-current DC/DC output stages
I_FSM	330 A - Non-repetitive surge current (8.3ms half-sine); handles load dump and inductive kick events
V_F	0.57 V @ 20A, 25°C - Low conduction loss enabling >95% efficiency in synchronous rectifier replacement roles
R_θJC	1.5 °C/W - Thermal resistance from junction to case; allows direct heatsinking via D2PAK tab to PCB copper
I_R	500 µA @ 40V, 25°C - Low leakage ensures minimal standby power loss in reverse-battery protection

Pinout & Package

Package: TO-263AB (D2PAK), surface-mount with exposed cathode tab for thermal and electrical connection. Molding compound meets UL 94V-0; matte tin-plated leads comply with J-STD-002 solderability.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Input current terminal	Soldered to input rail or switch node; carries full load current during forward conduction
Cathode (Tab)	Output current terminal & thermal path	Exposed metal tab functions as both cathode connection and primary heatsink interface to PCB copper
NC (Lead 2)	No connection	Internal die attach pad only; electrically isolated and not bonded to die

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive power electronics per stress test requirements including HTOL, TC, HAST, and UHAST
Guard ring structure	Enhances edge termination robustness against localized overvoltage transients in 12V/24V battery systems
Moisture sensitivity level 1	Enables standard SMT reflow without baking; eliminates pre-conditioning step in high-volume assembly
Halogen-free & RoHS compliant	Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally regulated automotive supply chains

Applications

Automotive DC/DC Converters	Reverse Battery Protection
Use Scenario: Step-down conversion in 12V-to-5V/3.3V subsystems for infotainment and ADAS ECUs. IC Role / Device Role / Timing Role: Freewheeling diode in asynchronous buck topology, conducting during low-side switch off-time. Use Value: 0.57V V_F reduces conduction loss by ~30% vs. comparable 45V Si diodes, improving thermal margin at 20A output.	Use Scenario: Preventing damage when vehicle battery is connected with reversed polarity during service. IC Role / Device Role / Timing Role: Series-blocking diode placed between battery input and main power rail. Use Value: 40V V_RRM safely withstands double-battery jump-start surges while 500µA leakage minimizes quiescent drain.
Car Lighting Drivers	Low-Voltage Inverters
Use Scenario: LED headlamp modules requiring stable 12V input with EMI-sensitive PWM dimming. IC Role / Device Role / Timing Role: Output rectifier in boost-derived constant-current driver stage. Use Value: Fast recovery and low capacitance (<1000pF) suppress ringing and reduce conducted EMI in high-frequency switching.	Use Scenario: Compact inverters powering 24V auxiliary loads from 12V battery in commercial vehicles. IC Role / Device Role / Timing Role: Output rectifier in push-pull or half-bridge inverter secondary side. Use Value: 330A I_FSM sustains short-circuit fault currents without thermal runaway during startup or overload.

Automotive DC/DC Converters

Reverse Battery Protection

Use Scenario: Step-down conversion in 12V-to-5V/3.3V subsystems for infotainment and ADAS ECUs.

IC Role / Device Role / Timing Role: Freewheeling diode in asynchronous buck topology, conducting during low-side switch off-time.

Use Value: 0.57V V_F reduces conduction loss by ~30% vs. comparable 45V Si diodes, improving thermal margin at 20A output.

Use Scenario: Preventing damage when vehicle battery is connected with reversed polarity during service.

IC Role / Device Role / Timing Role: Series-blocking diode placed between battery input and main power rail.

Use Value: 40V V_RRM safely withstands double-battery jump-start surges while 500µA leakage minimizes quiescent drain.

Car Lighting Drivers

Low-Voltage Inverters

Use Scenario: LED headlamp modules requiring stable 12V input with EMI-sensitive PWM dimming.

IC Role / Device Role / Timing Role: Output rectifier in boost-derived constant-current driver stage.

Use Value: Fast recovery and low capacitance (<1000pF) suppress ringing and reduce conducted EMI in high-frequency switching.

Use Scenario: Compact inverters powering 24V auxiliary loads from 12V battery in commercial vehicles.

IC Role / Device Role / Timing Role: Output rectifier in push-pull or half-bridge inverter secondary side.

Use Value: 330A I_FSM sustains short-circuit fault currents without thermal runaway during startup or overload.

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-20BQ040-M3/45	Same 40V V_RRM, 20A I_F, but higher V_F (0.61V typ.) and lower I_FSM (250A)	Limited surge margin in load-dump-prone automotive environments	Acceptable where thermal budget permits slightly higher conduction loss
ON Semiconductor SB2040	Identical V_RRM/I_F ratings, but not AEC-Q101 qualified and higher V_F (0.65V max)	Not suitable for automotive production without additional qualification testing	Consider only for industrial or consumer prototypes lacking automotive compliance requirements

Compared with VS-20BQ040-M3/45 and SB2040, the SRAS2040H delivers superior surge robustness and automotive qualification out-of-box, with lower forward voltage enabling tighter thermal design in space-constrained D2PAK layouts.

Availability

SRAS2040H is available at Aetrix Electronics and suitable for automotive DC/DC converters, reverse battery protection circuits, and car lighting drivers requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for SRAS2040H 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 devices and protection components.

The SRAS2040H belongs to TSC's AEC-Q101-qualified Schottky rectifier product line, engineered specifically for high-reliability 12V/24V automotive power conversion and battery interface applications.

FAQ

What is the maximum junction temperature rating for the SRAS2040H?

The SRAS2040H has a maximum junction temperature (T_J) of +150°C, with operational range from -55°C to +150°C. This rating enables reliable use in under-hood automotive environments where ambient temperatures exceed 105°C, provided thermal design maintains junction temperature within limit using the 1.5°C/W R_θJC path to the PCB.

Is the SRAS2040H pin-compatible with other parts in the SRAS20xxH series?

Yes, all SRAS20xxH variants-including SRAS2040H-share identical TO-263AB (D2PAK) package, pinout, and thermal footprint. Only V_RRM and related parameters (e.g., V_F, I_R) differ across the series, allowing direct substitution based on voltage requirement without layout change.

Does the SRAS2040H require special handling due to moisture sensitivity?

No-the SRAS2040H is rated Moisture Sensitivity Level 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/60% RH and processed using standard SMT reflow profiles without baking or dry-pack requirements.

What is the reverse leakage current specification for the SRAS2040H at elevated temperature?

At 100°C junction temperature and rated 40V reverse voltage, the SRAS2040H exhibits a maximum reverse leakage current (I_R) of 15 mA. This value is critical for reverse battery protection circuits where leakage directly impacts system quiescent current and battery life.

How does the guard ring feature improve reliability in automotive applications?

The guard ring in the SRAS2040H enhances edge termination robustness against localized electric field crowding during voltage transients such as load dump or ISO 7637-2 pulses. This design significantly improves long-term reliability in 12V/24V automotive systems where overvoltage events occur repeatedly over vehicle lifetime.

SRAS2040H Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Schottky

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

Current - Average Rectified (Io):: 20A

Voltage - Forward (Vf) (Max) @ If:: 570 mV @ 20 A

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

Reverse Recovery Time (trr):: -

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

Capacitance @ Vr, F:: -

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-263AB (D2PAK)

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

SRAS2040H FAQ

1.How can I place an order for SRAS2040H through Aetrix?

Please submit a Request for Quotation (RFQ) for SRAS2040H 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 SRAS2040H reliable?

The price and inventory of SRAS2040H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SRAS2040H is usually 5 days.

3.What payment methods are accepted for SRAS2040H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SRAS2040H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SRAS2040H?

SRAS2040H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SRAS2040H 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 SRAS2040H?

For technical support, including SRAS2040H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SRAS2040H requirements.

6.How does Aetrix verify that SRAS2040H is sourced from the original manufacturer or authorized distributors?

All SRAS2040H 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 SRAS2040H meets industry standards.

7.What is the process for return or replacement of SRAS2040H?

All SRAS2040H units undergo pre-shipment inspection (PSI). If there is an issue with SRAS2040H, 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 SRAS2040H part is unused and in its original packaging.

Return procedure for SRAS2040H:

1.Submit a request within 90 days.

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

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