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

Taiwan Semiconductor Corporation SRA840

Name: SRA840
Brand: Taiwan Semiconductor Corporation
SKU: SRA840
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SRA840

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: TO-220-2

Datasheet:: SRA840.pdf

Description:: 8A, 40V, PLANAR SCHOTTKY

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SRA840 from Taiwan Semiconductor is an 8 A, 40 V repetitive peak reverse voltage Schottky barrier rectifier in TO-220AC package, featuring low forward voltage (0.55 V at 8 A, 25°C), high surge current capability (150 A), and AEC-Q101 qualification option. It serves as a primary output rectifier in compact DC-DC converters for automotive infotainment power supplies.

For engineers reviewing the SRA840 datasheet, SRA840 pinout, SRA840 application, or SRA840 equivalent, key selection criteria include its 40 V V_RRM, 0.55 V forward drop at rated current, 150 A I_FSM, junction-to-case thermal resistance of 4 °C/W, and compatibility with high-efficiency, space-constrained 12 V–24 V input SMPS designs.

Technical Context

The SRA840 operates as a single-die, unidirectional Schottky rectifier with guard ring overvoltage protection and matte tin-plated leads compliant with J-STD-002 solderability. Its 40 V V_RRM and 150 A surge rating support transient-heavy 12 V rail rectification in automotive subsystems.

Thermally, it delivers 4 °C/W junction-to-case resistance and supports continuous operation up to 125°C junction temperature (derated above 25°C ambient), enabling stable performance in convection-cooled adapter and converter housings without forced airflow.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	40 V - Maximum reverse blocking voltage before breakdown; defines safe operating range in 36 V nominal systems with transients.
I_F	8 A - Continuous average forward current; supports ≥60 W output at 7.5 V with typical thermal margin in TO-220AC.
I_FSM	150 A - Non-repetitive surge current (8.3 ms half-sine); withstands inrush and load-dump events in automotive DC-DC stages.
V_F	0.55 V @ 8 A, 25°C - Low conduction loss; reduces rectifier power dissipation to ≤4.4 W at full load, easing thermal design.
R_θJC	4 °C/W - Junction-to-case thermal resistance; enables direct heatsink mounting for <10 W dissipation without thermal interface material.
T_J max	125°C - Maximum operating junction temperature; allows use in under-hood environments with ambient up to 85°C.
I_R	500 µA @ 40 V, 25°C - Low leakage ensures minimal standby power loss in always-on vehicle modules.

Pinout & Package

Package: TO-220AC - Three-terminal, through-hole plastic power package with isolated tab (cathode-connected), UL 94V-0 molding compound, and matte tin-plated leads.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Input current entry point	Connected to transformer secondary or switching node; requires PCB trace width ≥1.5 mm for 8 A continuous routing.
Cathode (Tab & Lead 2)	Output current exit / heat path	Electrically and thermally connected to heatsink; tab polarity marked on device body per standard orientation.
NC / Isolated Tab Mounting Hole	Mechanical mounting only	No electrical connection; used for screw-mounting to heatsink while maintaining isolation from cathode if insulated hardware is applied.

Key Features

Feature	Design Value
Guard ring structure	Prevents edge breakdown at 40 V V_RRM, improving reliability under voltage stress and humidity exposure.
AEC-Q101 qualification option (SRA840H)	Validated for automotive-grade temperature cycling, mechanical shock, and HTRB testing-enables use in ASIL-B power modules.
RoHS & halogen-free compliance	Meets IEC 61249-2-21; eliminates brominated flame retardants and supports lead-free reflow and end-of-life recycling.
150 A surge rating	Supports >20× rated current for short transients-eliminates need for external surge clamping in 12 V input DC-DC front ends.
4 °C/W R_θJC	Enables 100% thermal coupling to heatsink via tab mounting-no thermal pad required for ≤6 W dissipation in natural convection.

Applications

Automotive Infotainment Power Supply	Industrial 24 V DC-DC Converter
Use Scenario: 12 V battery-fed buck converter supplying 5 V/3 A to head unit display and audio processor. IC Role / Device Role / Timing Role: Output synchronous rectifier replacing MOSFET+driver; conducts during low-side switch conduction phase. Use Value: 0.55 V V_F reduces conduction loss by ~35% vs. silicon diode, increasing efficiency from 88% to 91.5% at full load.	Use Scenario: 24 V input, 12 V/5 A isolated flyback supplying PLC I/O modules in factory automation cabinets. IC Role / Device Role / Timing Role: Secondary-side freewheeling rectifier handling continuous 5 A output with 150 A surge tolerance for motor startup surges. Use Value: 125°C T_J max and 4 °C/W R_θJC allow operation at 70°C ambient without derating-reducing heatsink size by 40%.
USB-C PD Adapter Secondary Rectifier	Telecom Remote Radio Unit (RRU) Bias Supply
Use Scenario: 20 V output stage of 65 W USB-C PD adapter using active clamp flyback topology. IC Role / Device Role / Timing Role: Unidirectional output rectifier conducting during transformer reset phase; handles 8 A average + 150 A surge. Use Value: 500 µA reverse leakage at 40 V minimizes no-load power draw below 30 mW-meeting DOE Level VI efficiency requirements.	Use Scenario: 48 V to ±15 V dual-output bias supply for GaN PA driver stages in 5G macro base stations. IC Role / Device Role / Timing Role: Positive rail rectifier in center-tapped secondary winding; operates continuously at 85°C ambient with 125°C T_J limit. Use Value: Guard ring protection prevents premature failure during lightning-induced line transients on telecom power feeds.

Automotive Infotainment Power Supply

Industrial 24 V DC-DC Converter

Use Scenario: 12 V battery-fed buck converter supplying 5 V/3 A to head unit display and audio processor.

IC Role / Device Role / Timing Role: Output synchronous rectifier replacing MOSFET+driver; conducts during low-side switch conduction phase.

Use Value: 0.55 V V_F reduces conduction loss by ~35% vs. silicon diode, increasing efficiency from 88% to 91.5% at full load.

Use Scenario: 24 V input, 12 V/5 A isolated flyback supplying PLC I/O modules in factory automation cabinets.

IC Role / Device Role / Timing Role: Secondary-side freewheeling rectifier handling continuous 5 A output with 150 A surge tolerance for motor startup surges.

Use Value: 125°C T_J max and 4 °C/W R_θJC allow operation at 70°C ambient without derating-reducing heatsink size by 40%.

USB-C PD Adapter Secondary Rectifier

Telecom Remote Radio Unit (RRU) Bias Supply

Use Scenario: 20 V output stage of 65 W USB-C PD adapter using active clamp flyback topology.

IC Role / Device Role / Timing Role: Unidirectional output rectifier conducting during transformer reset phase; handles 8 A average + 150 A surge.

Use Value: 500 µA reverse leakage at 40 V minimizes no-load power draw below 30 mW-meeting DOE Level VI efficiency requirements.

Use Scenario: 48 V to ±15 V dual-output bias supply for GaN PA driver stages in 5G macro base stations.

IC Role / Device Role / Timing Role: Positive rail rectifier in center-tapped secondary winding; operates continuously at 85°C ambient with 125°C T_J limit.

Use Value: Guard ring protection prevents premature failure during lightning-induced line transients on telecom power feeds.

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-8EWH04FN-M3	Same 40 V V_RRM, 8 A I_F, but TO-220AB package with electrically isolated tab; V_F = 0.54 V (slightly lower), I_R = 1 mA @ 40 V (higher leakage).	Isolated tab simplifies heatsink mounting in floating-ground designs but increases cost; higher leakage limits use in ultra-low-power standby circuits.	Select when electrical isolation between cathode and heatsink is mandatory, and leakage <500 µA is not required.
ON Semiconductor SB840-E3/45	Identical TO-220AC package and pinout; V_F = 0.57 V @ 8 A (slightly higher), I_FSM = 125 A (25 A lower), no AEC-Q101 option.	Lacks automotive qualification and surge margin; suitable for commercial-grade adapters but not for automotive or industrial surge-prone environments.	Select for cost-sensitive commercial power supplies where AEC-Q101 and 150 A surge are not required.

Compared with VS-8EWH04FN-M3 and SB840-E3/45, the SRA840 provides the optimal balance of low V_F, high I_FSM, AEC-Q101 availability, and tight leakage-making it preferred for automotive and industrial DC-DC outputs where reliability under transient stress is critical.

Availability

SRA840 is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial 24 V DC-DC converters, and USB-C PD adapter secondary rectification requiring stable component supply across multi-year production cycles.

Supply support for SRA840 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 SRA820–SRA8150 series was designed specifically for high-efficiency, high-reliability rectification in automotive and industrial power conversion, emphasizing low V_F, robust surge capability, and AEC-Q101 qualification readiness.

FAQ

What is the maximum junction temperature rating for the SRA840?

The SRA840 has a maximum junction temperature (T_J) rating of 125°C under continuous operation. This rating applies across its full voltage range (20–150 V variants) and is validated per JEDEC standards. Operation beyond 125°C risks irreversible degradation of the Schottky junction. Derating curves in the datasheet specify allowable I_F reduction above 25°C ambient to maintain SRA840 junction temperature within this limit.

Does the SRA840 have AEC-Q101 qualification?

The base SRA840 is not AEC-Q101 qualified, but the SRA840H variant is fully AEC-Q101 qualified per Rev. J2103 documentation. The "H" suffix denotes automotive-grade screening including temperature cycling, highly accelerated life testing (HALT), and biased HTRB. For automotive applications requiring ASIL-B compliance, only SRA840H should be selected-not the standard SRA840.

What is the forward voltage of the SRA840 at 8 A and 100°C junction temperature?

The SRA840 forward voltage (V_F) is specified as 0.55 V maximum at 8 A and 25°C. At 100°C junction temperature, V_F decreases to approximately 0.48 V due to the negative temperature coefficient of Schottky diodes. This reduction improves conduction efficiency at elevated temperatures, supporting stable operation in thermally demanding environments without additional cooling.

Can the SRA840 replace the SRA830 in an existing design?

Yes, the SRA840 can directly replace the SRA830 because both share identical TO-220AC package, pinout, thermal characteristics (R_θJC = 4 °C/W), and forward current rating (I_F = 8 A). The only difference is V_RRM: SRA830 is rated for 30 V, while SRA840 is rated for 40 V. This higher voltage margin improves safety margin in 24 V systems with transients-no layout or thermal changes are needed for the swap.

What is the reverse leakage current of the SRA840 at 40 V and 100°C?

The SRA840 exhibits a maximum reverse leakage current (I_R) of 15 mA at 40 V and 100°C, as confirmed in the Electrical Specifications table. This value is measured under pulse conditions (PW = 30 ms) and reflects worst-case leakage under elevated thermal stress. At 25°C and 40 V, leakage is limited to 500 µA-critical for low-standby-power designs.

SRA840 Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: TO-220-2

Packaging:: Tube

Product Status:: Active

Technology:: Schottky

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

Current - Average Rectified (Io):: 8A

Voltage - Forward (Vf) (Max) @ If:: 550 mV @ 8 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:: TO-220AC

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

SRA840 FAQ

1.How can I place an order for SRA840 through Aetrix?

Please submit a Request for Quotation (RFQ) for SRA840 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 SRA840 reliable?

The price and inventory of SRA840 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SRA840 is usually 5 days.

3.What payment methods are accepted for SRA840?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SRA840 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SRA840?

SRA840 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SRA840 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 SRA840?

For technical support, including SRA840 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SRA840 requirements.

6.How does Aetrix verify that SRA840 is sourced from the original manufacturer or authorized distributors?

All SRA840 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 SRA840 meets industry standards.

7.What is the process for return or replacement of SRA840?

All SRA840 units undergo pre-shipment inspection (PSI). If there is an issue with SRA840, 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 SRA840 part is unused and in its original packaging.

Return procedure for SRA840:

1.Submit a request within 90 days.

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

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