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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Diode Arrays

Taiwan Semiconductor Corporation SRS1040H

Name: SRS1040H
Brand: Taiwan Semiconductor Corporation
SKU: SRS1040H
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SRS1040H

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Diode Arrays

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

Datasheet:: SRS1040H.pdf

Description:: DIODE ARR SCHOTT 40V 10A TO263AB

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Product details

Overview

SRS1040H from Taiwan Semiconductor is a 10A, 40V AEC-Q101-qualified Schottky barrier rectifier in TO-263AB (D2PAK) package, featuring 0.55V forward voltage at 5A/25°C, 120A surge capability, and junction temperature rating up to +150°C. It serves as a low-loss freewheeling or reverse-battery protection diode in automotive DC/DC converters.

For engineers reviewing the SRS1040H datasheet, SRS1040H pinout, SRS1040H application, or SRS1040H equivalent, key selection criteria include its 40V V_RRM, dual-die thermal performance (R_θJC = 2°C/W), AEC-Q101 qualification, and TO-263AB lead finish compliant with J-STD-002 solderability.

Technical Context

The SRS1040H integrates two Schottky die in a single TO-263AB package with common-cathode configuration, enabling high-current bidirectional conduction paths. Its guard ring structure provides overvoltage protection, and the matte tin-plated leads meet JESD 201 Class 2 whisker resistance.

Thermal design is supported by a low 2°C/W junction-to-case resistance and operation up to +150°C junction temperature. Reverse leakage is limited to 500 µA at 25°C and 15 mA at 100°C under rated 40V reverse bias.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Maximum repetitive reverse voltage before breakdown; defines safe operating range in reverse-biased applications like reverse battery protection.
I_F	10 A - Continuous forward current rating; supports high-current DC/DC output stages without forced air cooling.
I_FSM	120 A - Non-repetitive surge current (8.3 ms half-sine); withstands inrush and fault transients in automotive power rails.
V_F	0.55 V @ 5A, 25°C - Low forward drop reduces conduction loss and improves system efficiency in low-voltage converters.
R_θJC	2 °C/W - Junction-to-case thermal resistance; enables direct heatsinking via the exposed tab for thermal management.
T_J max	+150 °C - Maximum allowable junction temperature; supports under-hood automotive environments with minimal derating.
Qualification	AEC-Q101 - Certified for automotive-grade reliability including temperature cycling, HTRB, and ESD testing.

Pinout & Package

Package: TO-263AB (D2PAK), surface-mount, with exposed cathode pad for thermal and electrical connection. Matte tin-plated leads, polarity marked on top surface.

Pin/Terminal	Circuit Role	Design Meaning
Anode 1	Input terminal for first Schottky die	Accepts forward current into die; electrically isolated from Anode 2; used in dual-output or phase-split configurations.
Anode 2	Input terminal for second Schottky die	Independent anode path; enables dual-channel rectification or redundancy without external isolation components.
Cathode (Tab)	Common output node and thermal interface	Internally connected to both dies' cathodes; soldered to PCB copper pour for simultaneous current conduction and heat dissipation.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive power systems including engine control units and lighting modules requiring zero-failure reliability over 15-year service life.
Guard ring structure	Enhances edge termination robustness against transient overvoltage events, improving long-term stability in noisy 12V/24V vehicle networks.
Dual-die TO-263AB configuration	Provides two independent 10A Schottky paths in one footprint-reducing board area vs. discrete dual-diode solutions while maintaining thermal coupling.
Moisture sensitivity level 1	Eliminates bake requirements prior to reflow; compatible with standard SMT assembly lines without process modification.
Halogen-free & RoHS-compliant	Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally regulated automotive and industrial end equipment.

Applications

Automotive DC/DC Converters	Reverse Battery Protection
Use Scenario: Step-down conversion from 12V/48V vehicle battery to 3.3V/5V MCU rails in ADAS domain controllers. IC Role / Device Role / Timing Role: Freewheeling diode in synchronous or asynchronous buck topology, conducting during low-side switch off-time. Use Value: 0.55V V_F minimizes conduction loss at 10A load, directly improving converter efficiency and reducing thermal stress on adjacent ICs.	Use Scenario: Preventing damage when jumper cables are incorrectly connected during vehicle battery replacement or jump-starting. IC Role / Device Role / Timing Role: Series-blocking rectifier placed between battery input and downstream power distribution network. Use Value: 40V V_RRM safely clamps reverse-polarity transients up to ±35V, while 120A I_FSM survives momentary short-circuit surges.
LED Headlamp Drivers	Industrial 24V Power Supplies
Use Scenario: Constant-current LED driver for adaptive front-lighting systems (AFS) with PWM dimming and thermal foldback. IC Role / Device Role / Timing Role: Output rectifier in flyback or buck-boost stage delivering regulated current to high-power LED arrays. Use Value: Dual-die layout allows interleaved conduction to reduce ripple current and EMI, supporting CISPR 25 Class 5 compliance.	Use Scenario: DIN-rail mounted 24V industrial PSU powering PLC I/O modules and sensors in factory automation. IC Role / Device Role / Timing Role: Input-stage OR-ing diode or output freewheeling element in redundant or high-reliability SMPS designs. Use Value: +150°C T_J max and 2°C/W R_θJC enable stable operation in enclosed enclosures with ambient temperatures up to +85°C.

Automotive DC/DC Converters

Reverse Battery Protection

Use Scenario: Step-down conversion from 12V/48V vehicle battery to 3.3V/5V MCU rails in ADAS domain controllers.

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

Use Value: 0.55V V_F minimizes conduction loss at 10A load, directly improving converter efficiency and reducing thermal stress on adjacent ICs.

Use Scenario: Preventing damage when jumper cables are incorrectly connected during vehicle battery replacement or jump-starting.

IC Role / Device Role / Timing Role: Series-blocking rectifier placed between battery input and downstream power distribution network.

Use Value: 40V V_RRM safely clamps reverse-polarity transients up to ±35V, while 120A I_FSM survives momentary short-circuit surges.

LED Headlamp Drivers

Industrial 24V Power Supplies

Use Scenario: Constant-current LED driver for adaptive front-lighting systems (AFS) with PWM dimming and thermal foldback.

IC Role / Device Role / Timing Role: Output rectifier in flyback or buck-boost stage delivering regulated current to high-power LED arrays.

Use Value: Dual-die layout allows interleaved conduction to reduce ripple current and EMI, supporting CISPR 25 Class 5 compliance.

Use Scenario: DIN-rail mounted 24V industrial PSU powering PLC I/O modules and sensors in factory automation.

IC Role / Device Role / Timing Role: Input-stage OR-ing diode or output freewheeling element in redundant or high-reliability SMPS designs.

Use Value: +150°C T_J max and 2°C/W R_θJC enable stable operation in enclosed enclosures with ambient temperatures up to +85°C.

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-10BQ040-M3/45	Same 40V V_RRM, 10A I_F, TO-263AB package; VF = 0.57V @ 5A, slightly higher leakage (1 mA @ 25°C).	Not AEC-Q101 qualified; suitable for industrial but not automotive safety-critical use.	Select for cost-sensitive non-automotive designs where AEC-Q101 is not mandated.
ON Semiconductor SB1040	40V V_RRM, 10A I_F, TO-263AB; VF = 0.58V @ 5A; TJ max = +125°C (not +150°C); no guard ring.	Limited to under-hood ambient ≤ +75°C; lacks overvoltage edge protection for harsh automotive transients.	Choose only for cabin-grade applications with controlled thermal environment and lower surge exposure.

Compared with VS-10BQ040-M3/45 and SB1040, the SRS1040H delivers superior automotive readiness via AEC-Q101 certification, +150°C operation, and integrated guard ring-making it the only option qualified for under-hood DC/DC and reverse-battery protection where reliability is non-negotiable.

Availability

SRS1040H is available at Aetrix Electronics and suitable for automotive DC/DC converters, reverse battery protection circuits, and LED headlamp drivers requiring stable component supply across extended production lifecycles.

Supply support for SRS1040H 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 power semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving global automotive, industrial, and consumer markets since 1979.

The SRS10xxH series was developed specifically for high-reliability automotive power conversion, emphasizing AEC-Q101 compliance, thermal robustness, and surge resilience in compact surface-mount packages.

FAQ

What is the maximum junction temperature rating for the SRS1040H?

The SRS1040H has a maximum junction temperature (T_J) rating of +150°C, verified per AEC-Q101 test conditions. This allows reliable operation in under-hood automotive environments where ambient temperatures exceed +85°C. The device must be mounted with adequate copper pour on the cathode tab to maintain junction temperature within limits under full 10A load. Thermal simulation using the 2°C/W R_θJC value is recommended for final layout validation.

Is the SRS1040H pin-compatible with other parts in the SRS10xxH family?

Yes, all SRS10xxH devices-including SRS1020H, SRS1030H, and SRS1040H-share identical TO-263AB (D2PAK) mechanical outline, pin assignment, and thermal pad layout. Voltage ratings differ (20V–150V), but PCB footprint, solder stencil, and assembly process are fully interchangeable. The marking code "SRS1040" on the top surface identifies the 40V variant.

Does the SRS1040H require special handling for moisture sensitivity?

No-the SRS1040H is rated Moisture Sensitivity Level 1 (MSL-1) per J-STD-020, meaning it can be stored indefinitely at ≤30°C/85% RH and subjected to standard reflow profiles without baking. This eliminates pre-reflow dry-out steps and simplifies integration into high-volume SMT lines, unlike MSL-3 or higher parts that mandate strict floor-life controls.

What is the forward voltage specification for the SRS1040H at elevated temperature?

At 100°C junction temperature and 5A forward current, the SRS1040H exhibits a typical forward voltage of 0.45V-lower than its 25°C value of 0.55V-due to the negative temperature coefficient of Schottky diodes. This behavior improves efficiency in thermally stressed conditions but requires verification of system-level voltage margins at worst-case hot startup.

Can the SRS1040H be used in parallel configurations for higher current?

While the SRS1040H's dual-die structure supports internal current sharing, paralleling multiple SRS1040H units is not recommended without external ballasting due to V_F mismatch between lots. For >10A applications, select higher-rated variants (e.g., SRS1060H) or verify matched-bin V_F data from TSC's production lot reports before implementing parallel layouts.

SRS1040H 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

Diode Configuration:: 1 Pair Common Cathode

Technology:: Schottky

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

Current - Average Rectified (Io) (per Diode):: 10A

Voltage - Forward (Vf) (Max) @ If:: 550 mV @ 5 A

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

Reverse Recovery Time (trr):: -

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

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

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

SRS1040H FAQ

1.How can I place an order for SRS1040H through Aetrix?

Please submit a Request for Quotation (RFQ) for SRS1040H 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 SRS1040H reliable?

The price and inventory of SRS1040H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SRS1040H is usually 5 days.

3.What payment methods are accepted for SRS1040H?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SRS1040H transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SRS1040H?

SRS1040H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SRS1040H 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 SRS1040H?

For technical support, including SRS1040H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SRS1040H requirements.

6.How does Aetrix verify that SRS1040H is sourced from the original manufacturer or authorized distributors?

All SRS1040H 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 SRS1040H meets industry standards.

7.What is the process for return or replacement of SRS1040H?

All SRS1040H units undergo pre-shipment inspection (PSI). If there is an issue with SRS1040H, 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 SRS1040H part is unused and in its original packaging.

Return procedure for SRS1040H:

1.Submit a request within 90 days.

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

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