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Taiwan Semiconductor Corporation SRAS2020
- Part No.:
- SRAS2020
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
SRAS2020.pdf
- Description:
- 20A, 20V, PLANAR SCHOTTKY
- Quantity:
- Payment:
- Shipping:
Inventory:9,086
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Product details
Overview
SRAS2020 from Taiwan Semiconductor is a 20 A, 20 V repetitive peak reverse voltage Schottky barrier rectifier in TO-263AB (D2PAK) package, featuring 0.57 V typical forward voltage at 20 A and 25 °C, 330 A surge capability, and guard ring overvoltage protection - deployed in high-efficiency SMPS secondary-side rectification.
For engineers reviewing the SRAS2020 datasheet, SRAS2020 pinout, SRAS2020 application, or SRAS2020 equivalent, key selection criteria include low VF for thermal efficiency, TJ max of 150 °C for high-power density designs, RθJC of 1.5 °C/W for thermal management, and moisture sensitivity level 1 compliance for standard SMT assembly.
Technical Context
This Schottky rectifier uses a single-die construction optimized for low conduction loss in DC–DC and AC–DC secondary-side rectification. Its 20 V VRRM rating targets low-voltage synchronous rectifier replacement in 5–12 V output rails, with VF tightly specified at 0.57 V (max) under 20 A/25 °C conditions.
The device integrates a guard ring structure to enhance avalanche ruggedness and withstand transient overvoltage events common in switching converters. Thermal performance is defined by a junction-to-case resistance of 1.5 °C/W, enabling direct heatsink mounting via the exposed cathode tab in TO-263AB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum reverse blocking voltage; sets upper limit for safe operation in ≤20 V output circuits |
| IF | 20 A - Continuous forward current rating; defines steady-state power delivery capacity |
| VF @ 20 A, 25 °C | 0.57 V (typ) - Low conduction loss directly reduces I²R heating and improves system efficiency |
| IFSM | 330 A - Peak non-repetitive surge current handling; supports inrush and fault transients |
| TJ max | +150 °C - Maximum junction temperature; enables operation in thermally constrained enclosures |
| RθJC | 1.5 °C/W - Thermal resistance from junction to case; determines heatsink sizing for 20 A continuous load |
| MSL | Level 1 (per J-STD-020) - No floor life limitation; compatible with standard reflow without dry-pack requirements |
Pinout & Package
TO-263AB (D2PAK) surface-mount package with exposed cathode tab for thermal and electrical connection. Three terminals: Anode (pin 1), Cathode (tab + pin 2), and no third functional terminal - single-diode configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (lead) | Input anode connection | Accepts incoming positive voltage; routed to PCB trace with minimal inductance for fast switching |
| Cathode (tab + lead) | Output cathode connection | Primary thermal path and return path; requires large copper pour or direct heatsink attachment |
| Case (exposed tab) | Cathode potential | Electrically and thermally tied to cathode; must be isolated from other potentials unless referenced to system ground |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring structure | Enhances reverse avalanche ruggedness and prevents edge breakdown during voltage transients |
| Matte tin-plated leads | Ensures reliable solder wetting and long-term intermetallic stability per J-STD-002 |
| UL 94V-0 molding compound | Meets flammability safety requirements for enclosed power supply housings |
| JESD 201 Class 2 whisker resistance | Prevents tin whisker growth under thermal cycling, critical for automotive and industrial reliability |
| Halogen-free (IEC 61249-2-21) | Complies with environmental regulations and eliminates corrosive halogen gas emission during soldering or failure |
Applications
| Server VRM Output Rectification | Laptop Adapter Secondary Side |
|---|---|
Use Scenario: High-current, low-voltage DC output stage in server voltage regulator modules delivering 3.3 V or 5 V at up to 100 A per phase. IC Role / Device Role / Timing Role: Schottky rectifier replacing MOSFET synchronous switches where gate drive complexity is undesirable. Use Value: 0.57 V VF minimizes conduction loss at 20 A, reducing heat sink size while maintaining >92% efficiency at full load. | Use Scenario: Secondary-side rectification in compact 65 W laptop AC–DC adapters with tight thermal envelopes. IC Role / Device Role / Timing Role: Primary unidirectional current path converting transformer output to regulated DC bus. Use Value: MSL Level 1 and TO-263AB footprint enable direct placement on double-sided boards without baking or special handling. |
| Industrial DC–DC Converter | LED Driver Power Stage |
Use Scenario: Isolated 24 V input to 5 V/12 V output DC–DC converter in programmable logic controllers. IC Role / Device Role / Timing Role: Freewheeling diode and output rectifier in flyback or forward topology. Use Value: 330 A IFSM withstands startup surges and short-circuit recovery without degradation. | Use Scenario: Constant-current LED driver with 12–24 V output powering high-brightness arrays in signage or street lighting. IC Role / Device Role / Timing Role: Output rectifier in quasi-resonant flyback stage operating at 65–100 kHz. Use Value: 150 °C TJ max and 1.5 °C/W RθJC support continuous operation at 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-20BQ020-M3/45 | Same 20 V VRRM, 20 A IF, TO-263AB package; VF = 0.52 V (typ) at 20 A - slightly lower conduction loss | Higher IR leakage (1 mA @ 20 V, 125 °C vs. SRAS2020's 15 mA @ 100 °C) | Preferred where ultra-low VF dominates over high-temperature leakage tolerance |
| ON Semiconductor SB2020 | 20 V VRRM, 20 A IF, TO-263AB; VF = 0.55 V (typ); RθJC = 1.6 °C/W - marginally higher thermal resistance | Not qualified to JESD 201 Class 2 for whisker resistance | Suitable for commercial-grade systems where whisker risk is not mandated |
Compared with VS-20BQ020-M3/45 and SB2020, the SRAS2020 offers tighter high-temperature IR control and JESD 201 Class 2 whisker compliance - making it preferred for industrial and extended-temperature deployments where long-term solder joint integrity and leakage stability are critical.
Availability
SRAS2020 is available at Aetrix Electronics and suitable for switching mode power supplies, laptop adapters, and industrial DC–DC converters requiring stable component supply, consistent parametric performance, and RoHS/halogen-free compliance.
Supply support for SRAS2020 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 rectifiers, TVS devices, and MOSFETs since 1979.
The SRAS2020 belongs to TSC's SRAS Schottky rectifier family, engineered specifically for high-current, low-VF secondary-side rectification in space-constrained, thermally demanding power conversion systems.
FAQ
What is the maximum junction temperature rating for the SRAS2020?
The SRAS2020 has a maximum junction temperature (TJ max) of +150 °C, verified per absolute maximum ratings in the official datasheet. This allows sustained operation in high-ambient environments when paired with appropriate thermal design using its 1.5 °C/W RθJC and TO-263AB exposed cathode tab. Derating curves confirm usable current down to 125 °C case temperature.
Does the SRAS2020 have a guard ring structure, and what is its function?
Yes, the SRAS2020 incorporates a guard ring structure explicitly noted in its features list. This design element suppresses edge electric field concentration, improving reverse avalanche ruggedness and preventing premature breakdown during voltage transients - a critical reliability feature in switching power supplies subject to ringing and overshoot.
What is the forward voltage specification for the SRAS2020 at rated current?
The SRAS2020 exhibits a typical forward voltage (VF) of 0.57 V at 20 A and 25 °C, with no maximum value specified in the datasheet. This low VF is measured under pulsed conditions (PW = 0.3 ms), reflecting real-world conduction loss during switching cycle peaks - directly contributing to reduced power dissipation and improved efficiency in high-frequency converters.
Is the SRAS2020 compliant with RoHS and halogen-free standards?
Yes, the SRAS2020 is RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the official product documentation. These certifications ensure compatibility with environmentally regulated markets and eliminate corrosive halogen gas generation during soldering or end-of-life thermal events - essential for medical, industrial, and consumer electronics compliance.
What packaging and moisture sensitivity level does the SRAS2020 use?
The SRAS2020 is supplied in TO-263AB (D2PAK) package on tape-and-reel (800 units per reel) and carries Moisture Sensitivity Level (MSL) 1 per J-STD-020. This means it has unlimited floor life and can be processed using standard SMT reflow profiles without pre-baking - simplifying manufacturing logistics and reducing handling overhead.
SRAS2020 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):
- 20 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 @ 20 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263AB (D2PAK)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SRAS2020 FAQ
1.How can I place an order for SRAS2020 through Aetrix?
Please submit a Request for Quotation (RFQ) for SRAS2020 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 SRAS2020 reliable?
The price and inventory of SRAS2020 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SRAS2020 is usually 5 days.
3.What payment methods are accepted for SRAS2020?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SRAS2020 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SRAS2020?
SRAS2020 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SRAS2020 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 SRAS2020?
For technical support, including SRAS2020 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SRAS2020 requirements.
6.How does Aetrix verify that SRAS2020 is sourced from the original manufacturer or authorized distributors?
All SRAS2020 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 SRAS2020 meets industry standards.
7.What is the process for return or replacement of SRAS2020?
All SRAS2020 units undergo pre-shipment inspection (PSI). If there is an issue with SRAS2020, 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 SRAS2020 part is unused and in its original packaging.
Return procedure for SRAS2020:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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