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Taiwan Semiconductor Corporation SR4040PT
- Part No.:
- SR4040PT
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Diode Arrays
- Package:
- TO-247-3
- Datasheet:
-
SR4040PT.pdf
- Description:
- DIODE ARR SCHOTT 40V 40A TO247AD
- Quantity:
- Payment:
- Shipping:
Inventory:9,685
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Product details
Overview
SR4040PT from Taiwan Semiconductor is a 40A, 40V AEC-Q101-qualified Schottky barrier rectifier in TO-247AD (TO-3P) package, featuring 0.55V forward voltage at 20A/25°C, 400A surge capability, and guard ring overvoltage protection-used in high-efficiency SMPS and DC-DC converters for automotive and industrial power supplies.
For engineers reviewing the SR4040PT datasheet, SR4040PT pinout, SR4040PT application, or SR4040PT equivalent, key selection criteria include repetitive peak reverse voltage (40 V), junction-to-case thermal resistance (1.2 °C/W), temperature range (–55°C to +150°C), and UL recognition (E-326243) for safety-critical power conversion designs.
Technical Context
This dual-die Schottky rectifier operates with low conduction loss due to its metal-semiconductor junction, enabling high efficiency in continuous forward conduction mode. Its guard ring structure enhances ruggedness against transient overvoltage events, while the TO-247AD package supports high thermal dissipation via case mounting.
The device is rated for 40 A average forward current with 400 A non-repetitive surge (8.3 ms half-sine), and exhibits 1000 µA max reverse leakage at 25°C and rated VRRM, rising to 30 mA at 100°C-critical for thermal design in compact power stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 40 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in flyback/freewheeling paths |
| IF | 40 A - Continuous average forward current; determines heatsink sizing under steady-state load |
| IFSM | 400 A - Peak non-repetitive surge current; supports inrush and fault-current handling without failure |
| VF | 0.55 V @ 20 A, 25°C - Low forward drop reduces conduction loss and improves system efficiency |
| RθJC | 1.2 °C/W - Junction-to-case thermal resistance; enables direct thermal interface to heatsink for thermal management |
| TJ max | +150°C - Maximum junction temperature; allows operation in high-ambient environments like engine compartments |
| IR | 1000 µA @ 25°C - Reverse leakage at rated VRRM; impacts standby power and thermal runaway risk |
Pinout & Package
Package: TO-247AD (TO-3P), 3-terminal through-hole package with isolated case (cathode-connected tab), matte tin-plated leads, UL 94V-0 molding compound, and polarity marked on device body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 1) | Input current entry point | Connected to switching node or transformer secondary; must withstand high dv/dt during turn-off |
| Cathode (Lead 2) | Output current exit point | Typically tied to ground or output rail; low-inductance layout critical for EMI control |
| Case / Tab (Cathode) | Thermal & electrical cathode connection | Electrically tied to cathode; requires insulating washer if mounted to grounded heatsink |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per stress test requirements |
| Guard ring structure | Improves edge termination robustness, raising actual breakdown voltage margin above rated VRRM |
| UL Recognition #E-326243 | Confirms compliance with UL 60747-5 for discrete semiconductors, supporting safety-certified end equipment |
| Halogen-free construction | Meets IEC 61249-2-21; eliminates brominated flame retardants for RoHS-compliant manufacturing and recycling |
| High surge current rating | 400 A IFSM enables use in unregulated input stages without external fusing or derating |
Applications
| Automotive DC-DC Converters | Industrial SMPS Secondary Side |
|---|---|
Use Scenario: High-density 12 V → 5 V/3.3 V buck converter in ADAS domain controller power supply. IC Role / Device Role / Timing Role: Freewheeling diode in synchronous rectification topology, replacing MOSFET body diode to reduce conduction loss. Use Value: 0.55 V VF cuts conduction loss by ~35% vs. standard silicon diodes, improving efficiency and reducing thermal load on PCB. | Use Scenario: Output rectification in 48 V telecom rectifier module operating at 100 kHz switching frequency. IC Role / Device Role / Timing Role: Main output rectifier handling continuous 40 A load with minimal voltage drop and fast recovery. Use Value: Dual-die configuration ensures current sharing stability; 1.2 °C/W RθJC enables direct heatsink mounting for >92% full-load efficiency. |
| Consumer TV Power Supplies | Laptop Adapter Secondary Rectification |
Use Scenario: Main output rectifier in 200 W LED-backlit LCD TV power board with PFC front-end. IC Role / Device Role / Timing Role: Secondary-side Schottky rectifier in LLC resonant converter, conducting during low-voltage half-cycle. Use Value: 40 V VRRM provides sufficient margin over 36 V nominal output; 1000 µA IR minimizes standby power consumption. | Use Scenario: Output rectification in compact 90 W GaN-based laptop adapter with high power density. IC Role / Device Role / Timing Role: Primary freewheeling diode in active-clamp flyback, handling 20–40 A pulsed current. Use Value: TO-247AD package allows mechanical robustness and thermal performance unmatched by SMD alternatives in high-power adapters. |
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-40CPH04 | 40 A, 40 V, TO-247AC package; 0.54 V VF @ 20 A, but no AEC-Q101 qualification | Not approved for automotive under-hood use; suitable for industrial/commercial SMPS only | Select when AEC-Q101 is not required and lower VF is prioritized over qualification status |
| ON Semiconductor MBR4045CT | 40 A, 45 V, TO-220AB package; 0.62 V VF @ 20 A; higher RθJC (2.5 °C/W) | Limited to lower ambient temperatures due to inferior thermal performance; not UL-recognized | Choose only for cost-sensitive, non-safety-critical, low-power-density applications where TO-220 footprint is mandated |
Compared with VS-40CPH04 and MBR4045CT, the SR4040PT uniquely combines AEC-Q101 qualification, UL recognition, and 1.2 °C/W thermal resistance-making it the only option qualified for automotive-grade, safety-certified, thermally demanding rectification tasks.
Availability
SR4040PT is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial SMPS secondary side rectification, and consumer TV power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SR4040PT 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 discrete manufacturer headquartered in Hsinchu, Taiwan, serving automotive, industrial, and computing markets since 1979.
The SR40xxPT series is part of TSC's AEC-Q101-qualified Schottky rectifier product line, engineered specifically for high-reliability, high-efficiency power conversion in harsh-environment applications including engine control units and telecom infrastructure.
FAQ
What is the maximum junction temperature rating for SR4040PT?
The SR4040PT has a maximum junction temperature (TJ) rating of +150°C, verified per AEC-Q101 stress testing. This allows reliable operation in under-hood automotive environments and high-ambient industrial settings. The SR4040PT maintains specified electrical parameters up to this limit when thermal design respects the 1.2 °C/W RθJC and appropriate heatsinking is applied.
Is SR4040PT pin-compatible with other parts in the SR40xxPT family?
Yes, all SR40xxPT devices-including SR4020PT, SR4030PT, SR4040PT, SR4050PT, SR4060PT, SR4090PT, and SR40100PT-share identical TO-247AD (TO-3P) mechanical outline, pin assignment, and terminal configuration. Only the VRRM rating differs across the family, enabling direct voltage-level substitution without PCB redesign.
Does SR4040PT have UL recognition and what does that mean for my design?
Yes, SR4040PT carries UL Recognition File #E-326243 per UL 60747-5. This certification validates its construction, flammability (UL 94V-0), and electrical safety for use in end equipment seeking UL/CSA approval. It eliminates need for additional component-level safety testing in certified power supply designs.
What is the forward voltage specification for SR4040PT and how is it measured?
The SR4040PT specifies a typical forward voltage (VF) of 0.55 V at IF = 20 A and TJ = 25°C, measured using a 0.3 ms pulse width to avoid self-heating. This value reflects real-world conduction loss in high-frequency SMPS applications and is confirmed across production lots per TSC's H2103 revision datasheet.
Can SR4040PT be used in surface-mount designs?
No, SR4040PT is exclusively offered in the through-hole TO-247AD (TO-3P) package and is not available in any surface-mount variant. Its thermal and current-handling design relies on mechanical mounting and heatsink contact via the cathode tab-making it unsuitable for reflow-only assembly. For SMT alternatives, consider TSC's SMC-rectifier series or consult Aetrix for qualified drop-in replacements.
SR4040PT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- TO-247-3
- 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):
- 40A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 20 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 1 mA @ 40 V
- Operating Temperature - Junction:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-247AD (TO-3P)
SR4040PT FAQ
1.How can I place an order for SR4040PT through Aetrix?
Please submit a Request for Quotation (RFQ) for SR4040PT 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 SR4040PT reliable?
The price and inventory of SR4040PT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SR4040PT is usually 5 days.
3.What payment methods are accepted for SR4040PT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SR4040PT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SR4040PT?
SR4040PT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SR4040PT 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 SR4040PT?
For technical support, including SR4040PT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SR4040PT requirements.
6.How does Aetrix verify that SR4040PT is sourced from the original manufacturer or authorized distributors?
All SR4040PT 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 SR4040PT meets industry standards.
7.What is the process for return or replacement of SR4040PT?
All SR4040PT units undergo pre-shipment inspection (PSI). If there is an issue with SR4040PT, 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 SR4040PT part is unused and in its original packaging.
Return procedure for SR4040PT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SR4040PT Tags
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