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Taiwan Semiconductor Corporation SRF2040
- Part No.:
- SRF2040
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Diode Arrays
- Package:
- TO-220-3 Full Pack, Isolated Tab
- Datasheet:
-
SRF2040.pdf
- Description:
- DIODE ARR SCHOT 40V 20A ITO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,988
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Product details
Overview
SRF2040 from Taiwan Semiconductor is a 20A, 40V AEC-Q101-qualified Schottky barrier rectifier in ITO-220AB package with dual-die configuration, 0.55V max forward voltage at 10A/25°C, 200A surge rating, and 1.5°C/W junction-to-case thermal resistance - used in high-efficiency DC-DC converters and automotive-grade power adapters.
For engineers reviewing the SRF2040 datasheet, SRF2040 pinout, SRF2040 application, or SRF2040 equivalent, key selection criteria include its 40V repetitive peak reverse voltage, low VF for reduced conduction loss, AEC-Q101 qualification for automotive use, dual-die thermal sharing, and ITO-220AB mounting compatibility with standard heatsinks.
Technical Context
The SRF2040 integrates two Schottky diodes in a single ITO-220AB case, enabling shared thermal path and symmetrical current handling. Its guard ring structure provides overvoltage protection, and matte tin-plated leads meet J-STD-002 solderability standards.
Rated for TJ = –55°C to +125°C operation (with derating above 125°C), it delivers 500µA max reverse leakage at 25°C and 15mA at 100°C under rated 40V reverse bias - critical for maintaining efficiency in thermally constrained SMPS designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage; defines safe operating range in flyback/freewheeling paths |
| IF | 20 A - Continuous forward current rating; supports high-power adapter and converter output stages |
| IFSM | 200 A - Non-repetitive surge capability; withstands inrush and transient overloads without failure |
| VF (max) | 0.55 V @ 10A, 25°C - Low conduction loss directly reduces heat generation and improves system efficiency |
| RθJC | 1.5 °C/W - Enables predictable thermal design with heatsink interface; allows ~13.3W dissipation at ΔT = 20°C |
| IR (max) | 500 µA @ 40V, 25°C - Low leakage preserves standby power budget in energy-sensitive applications |
| TJ max | 125 °C - Specifies maximum junction temperature for continuous operation; requires thermal management above this point |
Pinout & Package
Package: ITO-220AB - Insulated TO-220 variant with internal isolation between collector tab and leads; 1.70g mass; UL 94V-0 molding compound; polarity marked on device body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode 1 | Input terminal for first Schottky die | Connects to switching node in synchronous rectification or freewheeling path |
| Anode 2 | Input terminal for second Schottky die | Enables dual-path or parallel configuration; shares common cathode for compact layout |
| Cathode | Common output terminal for both dies | Single low-impedance return path; simplifies PCB routing and thermal pad connection |
| Tab (isolated) | Thermal interface / mechanical ground | Electrically isolated metal tab for heatsink mounting; no electrical connection to circuit |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive power systems including engine control modules and ADAS power supplies |
| Guard ring structure | Enhances ruggedness against voltage transients and edge breakdown in high-dV/dt environments |
| Dual-die configuration | Improves current sharing and thermal distribution versus single-die alternatives of same rating |
| UL Recognized (E-326243) | Meets safety requirements for end-equipment certification in commercial and industrial power supplies |
| Halogen-free (IEC 61249-2-21) | Complies with environmental regulations for RoHS-compliant manufacturing and recycling |
Applications
| Automotive DC-DC Converters | Industrial SMPS Output Stage |
|---|---|
Use Scenario: High-reliability 12V-to-5V/3.3V conversion in vehicle infotainment and body control units. IC Role / Device Role / Timing Role: Freewheeling Schottky rectifier replacing slower diodes to minimize switching losses. Use Value: 0.55V VF and AEC-Q101 qualification ensure stable operation across –40°C to +125°C ambient with <1% efficiency penalty. | Use Scenario: Secondary-side rectification in 200–500W open-frame industrial power supplies. IC Role / Device Role / Timing Role: Main output rectifier handling continuous 20A load with minimal thermal rise. Use Value: 1.5°C/W RθJC enables direct heatsink mounting without thermal interface pads, reducing BOM cost and assembly steps. |
| USB-C PD Adapters | Telecom Power Rectification |
Use Scenario: Compact 65W USB-C power adapter requiring high efficiency and low EMI. IC Role / Device Role / Timing Role: Synchronous rectifier in QR flyback topology operating up to 150kHz. Use Value: Low IR (500µA @ 25°C) and fast recovery suppress standby leakage and improve light-load efficiency. | Use Scenario: -48V telecom rectifier module supplying distributed power to base station subsystems. IC Role / Device Role / Timing Role: Input-stage OR-ing diode protecting against reverse current during hot-swap events. Use Value: 200A IFSM rating ensures survival during 10ms input short-circuit faults without degradation. |
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-M3/4B | Same 40V VRRM, 20A IF, but TO-220AC package (non-isolated tab); 0.57V VF max | Lacks AEC-Q101 qualification and guard ring; not approved for automotive underhood use | Select when isolation is unnecessary and cost is prioritized over automotive compliance |
| ON Semiconductor MUR2040CT | Higher VF (0.92V typ), higher IR (100µA @ 100°C), but 150°C TJ max rating | Designed for general-purpose industrial use; not AEC-Q101 qualified or UL recognized | Choose only if extended temperature operation (>125°C) is required and efficiency is secondary |
Compared with VS-20BQ040-M3/4B and MUR2040CT, the SRF2040 uniquely combines AEC-Q101 qualification, UL recognition, guard ring protection, and 0.55V VF in an insulated ITO-220AB package - making it the only option qualified for automotive front-end power conversion where reliability and safety certification are mandatory.
Availability
SRF2040 is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial SMPS output stages, and USB-C PD adapters requiring stable component supply, long-term lifecycle support, and certified compliance documentation.
Supply support for SRF2040 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, rectifiers, and protection components.
The SRF20xx series was developed specifically for high-efficiency, high-reliability power conversion in automotive and industrial applications - emphasizing low VF, AEC-Q101 compliance, and robust thermal performance in insulated packages.
FAQ
What is the maximum junction temperature rating for the SRF2040?
The SRF2040 has a maximum junction temperature (TJ max) of +125°C for continuous operation. Operation above this temperature requires derating per the Forward Current Derating Curve in the datasheet. The device is not rated for 150°C continuous use - that specification applies only to higher-voltage variants like SRF2090 through SRF20150.
Is the SRF2040 pin-compatible with other parts in the SRF20xx family?
Yes, all SRF20xx parts - including SRF2040 - share identical ITO-220AB packaging, pinout, and mechanical footprint. This allows drop-in replacement across voltage grades (20V–150V) without PCB layout changes, provided thermal and electrical design margins accommodate the new VRRM and VF characteristics.
Does the SRF2040 have AEC-Q101 qualification?
Yes, the SRF2040 is AEC-Q101 qualified when ordered with the "H" suffix (e.g., SRF2040H). Standard SRF2040 parts are not automatically qualified; AEC-Q101 compliance requires explicit ordering of the H-version, which undergoes additional stress testing per automotive reliability standards.
What is the reverse leakage current of the SRF2040 at elevated temperature?
At TJ = 100°C and VR = 40V, the SRF2040 exhibits a maximum reverse leakage current (IR) of 15mA per diode. This value is confirmed in the Electrical Specifications table and is critical for thermal runaway analysis in high-ambient-temperature applications such as under-hood automotive systems.
How does the guard ring feature improve reliability in the SRF2040?
The guard ring in the SRF2040 mitigates edge breakdown under high dV/dt conditions by redistributing electric field concentration at the silicon periphery. This extends operational life during voltage transients - especially in flyback and LLC resonant converters - and is a key differentiator versus non-guarded Schottky rectifiers like the MUR2040CT.
SRF2040 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- TO-220-3 Full Pack, Isolated Tab
- Packaging:
- Tube
- Product Status:
- Active
- Diode Configuration:
- 1 Pair Common Cathode
- Technology:
- Schottky
- Voltage - DC Reverse (Vr) (Max):
- 40 V
- Current - Average Rectified (Io) (per Diode):
- 20A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 10 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:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ITO-220AB
SRF2040 FAQ
1.How can I place an order for SRF2040 through Aetrix?
Please submit a Request for Quotation (RFQ) for SRF2040 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 SRF2040 reliable?
The price and inventory of SRF2040 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SRF2040 is usually 5 days.
3.What payment methods are accepted for SRF2040?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SRF2040 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SRF2040?
SRF2040 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SRF2040 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 SRF2040?
For technical support, including SRF2040 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SRF2040 requirements.
6.How does Aetrix verify that SRF2040 is sourced from the original manufacturer or authorized distributors?
All SRF2040 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 SRF2040 meets industry standards.
7.What is the process for return or replacement of SRF2040?
All SRF2040 units undergo pre-shipment inspection (PSI). If there is an issue with SRF2040, 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 SRF2040 part is unused and in its original packaging.
Return procedure for SRF2040:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SRF2040 Tags
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