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Taiwan Semiconductor Corporation SRAF820
- Part No.:
- SRAF820
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-220-2 Full Pack
- Datasheet:
-
SRAF820.pdf
- Description:
- 8A, 20V, PLANAR SCHOTTKY
- Quantity:
- Payment:
- Shipping:
Inventory:3,386
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Product details
Overview
SRAF820 from Taiwan Semiconductor is an 8A, 20V repetitive peak reverse voltage Schottky barrier rectifier in ITO-220AC package, featuring 0.55V forward voltage at 8A and 500µA reverse leakage at 25°C, designed for high-efficiency DC/DC converters and SMPS secondary-side rectification.
For engineers reviewing the SRAF820 datasheet, SRAF820 pinout, SRAF820 application, or SRAF820 equivalent, key selection criteria include its 150A surge rating, 5°C/W junction-to-case thermal resistance, AEC-Q101 qualification option (SRAF820H), and compatibility with high-frequency switching topologies requiring low conduction loss.
Technical Context
The SRAF820 uses a single-die Schottky structure with guard ring over-voltage protection, enabling stable operation up to 125°C junction temperature. Its 10,000 V/µs critical dv/dt rating supports fast-switching environments without false triggering.
Designed for unidirectional power conversion, it delivers low forward voltage drop and high surge current capability (150A, 8.3ms half-sine) while maintaining RoHS and halogen-free compliance per IEC 61249-2-21.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 20 V - Maximum repetitive reverse blocking voltage; defines safe operating range in rectifier circuits |
| IF | 8 A - Continuous forward current rating; determines steady-state power handling capacity |
| IFSM | 150 A - Non-repetitive surge current; enables robustness against line transients and startup inrush |
| VF @ 8A, 25°C | 0.55 V - Low forward voltage drop; reduces conduction loss and improves system efficiency |
| IR @ 20V, 25°C | 500 µA - Reverse leakage current; impacts standby power and thermal stability in high-impedance circuits |
| RθJC | 5 °C/W - Junction-to-case thermal resistance; enables effective heatsinking with standard mounting torque (0.56 N·m) |
Pinout & Package
Package: ITO-220AC - Insulated TO-220 variant with isolated tab, UL 94V-0 molding compound, matte tin-plated leads, and polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to input/high-side of rectifier stage; marked on device body |
| Cathode | Forward current exit point | Connected to output/low-side; electrically tied to metal tab in ITO-220AC |
| Tab (isolated) | Thermal path / mechanical mount | Electrically isolated from die; provides heatsinking without shorting cathode |
Key Features
| Feature | Design Value |
|---|---|
| Guard ring over-voltage protection | Prevents premature breakdown under transient voltage stress, improving reliability in noisy power rails |
| AEC-Q101 qualified version available (SRAF820H) | Validated for automotive-grade temperature cycling, humidity, and mechanical shock per JESD22 standards |
| UL Recognized File # E-326243 | Confirms safety compliance for end-equipment certification in commercial and industrial power supplies |
| Junction temperature range: –55°C to +125°C | Supports operation in thermally demanding environments such as enclosed adapters and sealed DC/DC modules |
Applications
| Server Power Supply Rectification | Laptop Adapter Secondary Side |
|---|---|
Use Scenario: High-density 48V-to-12V intermediate bus converter in rack-mounted servers. IC Role / Device Role / Timing Role: Primary synchronous rectifier replacing MOSFETs in LLC resonant topology. Use Value: 0.55V VF minimizes conduction loss at 8A continuous load, reducing heat sink size by ~22% vs. higher-VF alternatives. | Use Scenario: Compact 65W USB-C PD adapter with active clamp flyback architecture. IC Role / Device Role / Timing Role: Output rectifier handling 3.3–20V variable output with tight thermal constraints. Use Value: 5°C/W RθJC allows direct mounting to aluminum housing, eliminating need for additional thermal interface material. |
| Industrial PLC Power Module | Automotive Infotainment DC/DC Stage |
Use Scenario: 24V input power module supplying 5V/3.3V logic rails in programmable logic controllers. IC Role / Device Role / Timing Role: Input-stage rectifier before bulk capacitor in wide-input buck converter. Use Value: 150A IFSM withstands 100ms brown-out recovery surges without degradation. | Use Scenario: 12V-to-5V step-down converter powering display and audio subsystems in head units. IC Role / Device Role / Timing Role: Secondary-side rectifier in isolated flyback with AEC-Q101 requirement. Use Value: SRAF820H variant meets automotive qualification while maintaining identical electrical specs and footprint. |
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-8EWH02FN-M3 | Same ITO-220AC package, 20V VRRM, 8A IF, but VF = 0.49V (typ) at 8A; lower RθJC = 4.5°C/W | Higher efficiency at light loads due to lower VF; lacks AEC-Q101 option | Preferred where ultra-low VF dominates over automotive qualification |
| ON Semiconductor MBR820CT | Dual common-cathode configuration in TO-220AB; same 20V/8A rating but VF = 0.57V (max); no guard ring | Requires PCB layout change; not suitable for single-diode replacement without circuit redesign | Only viable if dual-output topology already exists and thermal margin permits higher VF |
Compared with VS-8EWH02FN-M3 and MBR820CT, the SRAF820 offers balanced performance: lower VF than MBR820CT, AEC-Q101 availability unlike VS-8EWH02FN-M3, and proven guard ring protection for industrial surge immunity.
Availability
SRAF820 is available at Aetrix Electronics and suitable for switching mode power supplies, laptop adapters, and industrial DC/DC converters requiring stable component supply with consistent thermal and electrical performance across production batches.
Supply support for SRAF820 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 SRAF8xx series targets high-reliability, high-efficiency rectification in compact power systems, emphasizing thermal robustness, surge resilience, and automotive-grade variants for mission-critical applications.
FAQ
What is the maximum junction temperature rating for the SRAF820?
The SRAF820 has a maximum junction temperature (TJ MAX) of +125°C under continuous operation. This rating is confirmed in the Absolute Maximum Ratings table and applies to all SRAF8xx devices rated up to 100V; the 150°C rating applies only to SRAF890 through SRAF8150. Thermal design must ensure junction temperature remains within this limit during full-load operation.
Is the SRAF820 pin-compatible with other parts in the SRAF8xx family?
Yes, all SRAF8xx parts-including SRAF820-share identical ITO-220AC packaging, pinout, and mechanical dimensions. The only differences are VRRM rating and corresponding electrical parameters (e.g., VF, IR). This allows direct substitution in existing layouts when voltage requirements change, provided thermal and surge margins remain adequate for the new rating.
Does the SRAF820 have AEC-Q101 qualification?
The base SRAF820 is not AEC-Q101 qualified, but the SRAF820H variant is explicitly listed in the Ordering Information as AEC-Q101 qualified. Both share identical electrical specifications and package; qualification applies only to the "H" suffix version, which undergoes extended reliability testing per JESD22 standards for automotive use.
What is the reverse leakage current specification for the SRAF820 at elevated temperature?
At TJ = 100°C and VR = 20V, the SRAF820 exhibits a maximum reverse leakage current (IR) of 15 mA, as specified in the Electrical Specifications table. This value is critical for standby power budgeting in high-temperature environments such as enclosed power adapters or industrial enclosures.
How does the guard ring feature improve reliability of the SRAF820?
The guard ring in the SRAF820 mitigates edge breakdown under high dv/dt conditions by controlling electric field distribution at the silicon periphery. With a rated critical dv/dt of 10,000 V/µs, this feature prevents premature avalanche failure during fast-switching transients common in modern SMPS and resonant converters, extending operational lifetime in noisy power systems.
SRAF820 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- TO-220-2 Full Pack
- Packaging:
- Tube
- 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:
- 500 µA @ 20 V
- Capacitance @ Vr, F:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ITO-220AC
- Operating Temperature - Junction:
- -55°C ~ 125°C
SRAF820 FAQ
1.How can I place an order for SRAF820 through Aetrix?
Please submit a Request for Quotation (RFQ) for SRAF820 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 SRAF820 reliable?
The price and inventory of SRAF820 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SRAF820 is usually 5 days.
3.What payment methods are accepted for SRAF820?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SRAF820 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SRAF820?
SRAF820 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SRAF820 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 SRAF820?
For technical support, including SRAF820 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SRAF820 requirements.
6.How does Aetrix verify that SRAF820 is sourced from the original manufacturer or authorized distributors?
All SRAF820 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 SRAF820 meets industry standards.
7.What is the process for return or replacement of SRAF820?
All SRAF820 units undergo pre-shipment inspection (PSI). If there is an issue with SRAF820, 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 SRAF820 part is unused and in its original packaging.
Return procedure for SRAF820:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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