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Taiwan Semiconductor Corporation SRAS820
- Part No.:
- SRAS820
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
SRAS820.pdf
- Description:
- 8A, 20V, PLANAR SCHOTTKY
- Quantity:
- Payment:
- Shipping:
Inventory:3,654
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Product details
Overview
SRAS820 from Taiwan Semiconductor is a 20 V, 8 A Schottky barrier surface-mount rectifier in TO-263AB (D2PAK) package, optimized for high-efficiency DC/DC conversion and SMPS secondary-side rectification with 0.55 V forward voltage at 8 A and 150 A surge capability.
For engineers reviewing the SRAS820 datasheet, SRAS820 pinout, SRAS820 application, or SRAS820 equivalent, key selection factors include its 20 V repetitive peak reverse voltage, 3 °C/W junction-to-case thermal resistance, guard-ring overvoltage protection, and J-STD-020 Level 1 moisture sensitivity rating.
Technical Context
The SRAS820 employs a single-die Schottky structure with guard ring termination to sustain transient overvoltage events while maintaining low conduction loss. Its 0.55 V forward voltage at 8 A and 100 µA reverse leakage at 25 °C enable high-efficiency operation in compact power converters.
Thermally, it delivers 3 °C/W junction-to-case resistance in the TO-263AB package, supporting continuous 8 A conduction up to 125 °C junction temperature. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 molding compound requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum repetitive reverse blocking voltage; defines safe operating limit in flyback or forward converter secondary circuits |
| IF | 8 A - Continuous average forward current; supports high-density 12–24 V output rails without forced air cooling |
| IFSM | 150 A - Non-repetitive surge current (8.3 ms half-sine); withstands startup inrush and load dump transients |
| VF | 0.55 V @ 8 A, 25 °C - Low conduction loss enabling >92% efficiency in 5–12 V DC/DC stages |
| RθJC | 3 °C/W - Enables direct heatsinking via exposed tab; allows 8 A operation with ≤24 °C case-to-ambient rise at 1 W dissipation |
| TJ max | 125 °C - Maximum junction temperature; sets thermal derating boundary for sealed or high-ambient environments |
| MSL | Level 1 per J-STD-020 - No floor life limitation; compatible with standard SMT reflow without dry-pack requirement |
Pinout & Package
Package: TO-263AB (D2PAK), surface-mount with exposed cathode tab for thermal and electrical connection. Cathode marked by polarity symbol on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 2) | Input terminal for forward conduction | Connected to transformer secondary or switch node; carries full load current during conduction phase |
| Cathode (Exposed Tab + Lead 3) | Output terminal / thermal path | Electrically and thermally tied to PCB copper pour; serves as primary heat extraction path and return node |
| NC (Lead 1) | No-connect terminal | Internal die attach flag; electrically isolated and not bonded; must remain unconnected in layout |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring overvoltage protection | Enables robust operation under line transients and inductive kickback without avalanche degradation |
| Low 0.55 V forward drop at 8 A | Reduces conduction loss by ≥35% vs. comparable 20 V fast recovery diodes, lowering thermal stress |
| 150 A IFSM surge rating | Supports reliable cold-start in high-capacitance output designs without derating or parallel devices |
| TO-263AB thermal performance | 3 °C/W RθJC enables 8 A continuous operation with <15 °C temperature rise over 1-in² 2-oz copper pad |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally regulated end equipment |
Applications
| Laptop AC Adapter Secondary Rectification | Industrial 24 V DC/DC Converter Output Stage |
|---|---|
Use Scenario: High-volume 65 W laptop adapter with synchronous rectification disabled. IC Role / Device Role / Timing Role: Primary uncontrolled rectifier on secondary winding of forward transformer. Use Value: 0.55 V VF minimizes conduction loss at 5–6 A typical load, improving no-load efficiency and reducing heatsink size. | Use Scenario: DIN-rail mounted 24 V input to 5 V/3.3 V isolated DC/DC module for PLC I/O. IC Role / Device Role / Timing Role: Freewheeling diode in active clamp forward topology secondary side. Use Value: 150 A IFSM withstands repeated 100 ms output short-circuit events without failure. |
| USB-C PD 20 V Output Buck Converter | Telecom 48 V Input Telecom Rectifier Module |
Use Scenario: 20 V output stage of 100 W USB-C PD buck converter with 8 A maximum load. IC Role / Device Role / Timing Role: Synchronous rectifier replacement in cost-sensitive design where gate drive complexity is avoided. Use Value: TO-263AB package allows direct thermal coupling to chassis ground, eliminating need for thermal vias or paste. | Use Scenario: 48 V telecom rectifier board requiring 20 V-rated redundancy diodes across parallel modules. IC Role / Device Role / Timing Role: OR-ing diode in hot-swap redundant power feed with reverse polarity protection. Use Value: Guard ring structure prevents catastrophic failure during -48 V reverse bias transients common in telecom backplane faults. |
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-8EWH02-M3 | 20 V, 8 A, TO-252AA (DPAK); RθJC = 4.5 °C/W; VF = 0.52 V @ 8 A | Lower thermal resistance not achievable; requires larger PCB area for equivalent cooling | Preferred when DPAK footprint compatibility is mandatory and thermal margin allows 1.5 °C/W higher resistance |
| ON Semiconductor SB820 | 20 V, 8 A, TO-263AB; VF = 0.57 V @ 8 A; IFSM = 120 A; MSL Level 1 | 18% lower surge rating limits use in high-inertia motor drive auxiliary supplies | Valid alternative where surge margin is relaxed and same package thermal interface is required |
Compared with VS-8EWH02-M3 and SB820, the SRAS820 offers superior thermal performance (3 °C/W vs. 4.5/3.5 °C/W) and highest surge tolerance (150 A), making it optimal for space-constrained, high-reliability industrial SMPS where thermal headroom and transient robustness are critical.
Availability
SRAS820 is available at Aetrix Electronics and suitable for switching mode power supplies, DC/DC converters, and AC adapters requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SRAS820 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, serving global power electronics markets since 1979.
The SRAS8xx series targets high-efficiency, surface-mount Schottky rectification in consumer and industrial power conversion, emphasizing thermal robustness, surge resilience, and automated assembly compatibility.
FAQ
What is the maximum junction temperature rating for the SRAS820?
The SRAS820 has a maximum junction temperature (TJ) rating of +125 °C under continuous operation. This limit applies across its full rated current range and defines the upper thermal boundary for reliability modeling and derating calculations in thermal design. Exceeding this temperature may accelerate parametric drift and reduce long-term operational life.
Does the SRAS820 have a guard ring structure, and what function does it serve?
Yes, the SRAS820 incorporates a guard ring structure explicitly stated in its features. This design element enhances edge termination robustness, allowing the device to withstand transient overvoltage conditions-such as inductive kickback or line surges-without localized avalanche breakdown or premature failure. It directly contributes to field reliability in unregulated or noisy power environments.
What is the moisture sensitivity level (MSL) of the SRAS820, and how does it affect handling?
The SRAS820 is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and requires no dry-pack storage or baking prior to SMT reflow. This simplifies manufacturing logistics and eliminates moisture-related popcorning risk during standard lead-free reflow profiles, supporting high-yield automated assembly without special handling protocols.
Can the SRAS820 be used in place of a fast recovery diode in a 20 V output SMPS?
Yes, the SRAS820 is specifically designed as a Schottky replacement for fast recovery diodes in 20 V output SMPS applications. Its 0.55 V forward voltage reduces conduction loss significantly compared to silicon FRDs (typically 1.1–1.3 V), improving efficiency and thermal performance-provided reverse leakage at elevated temperature remains within system budget.
What is the marking code printed on the SRAS820 device body?
The SRAS820 is marked with "SRAS820" on its top surface, as confirmed in the Absolute Maximum Ratings table and Marking Diagram section of the official Taiwan Semiconductor datasheet (Version K2103). This marking enables visual identification and traceability during inspection and rework.
SRAS820 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):
- 8A
- Voltage - Forward (Vf) (Max) @ If:
- 550 mV @ 8 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- -
- Current - Reverse Leakage @ Vr:
- 100 µA @ 20 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263AB (D2PAK)
- Operating Temperature - Junction:
- -55°C ~ 125°C
SRAS820 FAQ
1.How can I place an order for SRAS820 through Aetrix?
Please submit a Request for Quotation (RFQ) for SRAS820 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 SRAS820 reliable?
The price and inventory of SRAS820 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SRAS820 is usually 5 days.
3.What payment methods are accepted for SRAS820?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SRAS820 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SRAS820?
SRAS820 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SRAS820 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 SRAS820?
For technical support, including SRAS820 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SRAS820 requirements.
6.How does Aetrix verify that SRAS820 is sourced from the original manufacturer or authorized distributors?
All SRAS820 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 SRAS820 meets industry standards.
7.What is the process for return or replacement of SRAS820?
All SRAS820 units undergo pre-shipment inspection (PSI). If there is an issue with SRAS820, 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 SRAS820 part is unused and in its original packaging.
Return procedure for SRAS820:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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