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Taiwan Semiconductor Corporation SFAS805G
- Part No.:
- SFAS805G
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
SFAS805G.pdf
- Description:
- DIODE GEN PURP 300V 8A TO263AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,600
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Product details
Overview
SFAS805G from Taiwan Semiconductor is an 8A, 500V super fast surface-mount rectifier in TO-263AB (D2PAK) package, designed for high-efficiency DC-DC converters and switching-mode inverters. It delivers VF = 1.30 V at 8A/25°C, trr = 35 ns, RθJC = 2.2°C/W, and supports TJ up to 150°C.
For engineers reviewing the SFAS805G datasheet, SFAS805G pinout, SFAS805G application, or SFAS805G equivalent, key selection criteria include reverse voltage rating (500 V), forward surge capability (125 A), junction capacitance (60 pF), thermal resistance, and RoHS/halogen-free compliance for industrial power conversion designs.
Technical Context
The SFAS805G is a single-die, glass-passivated silicon rectifier optimized for fast switching with low conduction and recovery losses. Its 500 V VRRM and 35 ns trr enable use in high-frequency SMPS topologies where reduced switching loss and EMI are critical.
Thermally, it features a low 2.2°C/W junction-to-case resistance and operates across –55°C to +150°C, supporting high-power-density layouts in constrained PCB spaces. The TO-263AB package provides robust thermal dissipation while meeting J-STD-020 Level 1 moisture sensitivity and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRRM | 500 V - blocks up to 500 V repetitive reverse voltage without breakdown |
| IF | 8 A - continuous forward current rating at TC = 110°C |
| IFSM | 125 A - withstands non-repetitive 8.3 ms half-sine surge, enabling robust inrush handling |
| VF @ 8A, 25°C | 1.30 V - low forward drop reduces conduction loss and heat generation |
| trr | 35 ns - fast recovery minimizes switching loss and ringing in high-frequency converters |
| RθJC | 2.2°C/W - enables efficient heat transfer to heatsink or copper pour |
| CJ @ 1 MHz, 4 V | 60 pF - lower capacitance than lower-voltage variants improves high-frequency performance |
Pinout & Package
Package: TO-263AB (D2PAK), surface-mount, single-anode/single-cathode configuration with exposed cathode tab for thermal and electrical connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Lead 2) | Input current terminal | Connected to source/switching node; carries full load current into device |
| Cathode (Tab + Lead 3) | Output current terminal | Exposed metal tab serves as primary cathode path and thermal interface; electrically tied to lead 3 |
| NC (Lead 1) | No connect | Internally unconnected; left floating per design - not to be bonded or soldered |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances reliability and humidity resistance without requiring conformal coating |
| Low VF (1.30 V @ 8A) | Reduces power dissipation by ~15% vs. comparable 600 V rectifiers with VF > 1.5 V |
| 35 ns reverse recovery | Enables stable operation up to ~500 kHz switching frequency with minimal tail current loss |
| TO-263AB thermal performance | 2.2°C/W RθJC allows 8 A continuous operation with ≤30°C case rise over ambient using 25 cm² 2-oz copper |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| DC–DC Converters | Switching Inverters |
|---|---|
Use Scenario: Secondary-side synchronous rectification in isolated 48 V–12 V buck-derived converters for telecom and server PSUs. IC Role / Device Role / Timing Role: Freewheeling rectifier conducting during low-side switch off-time; handles 8 A average output current. Use Value: 1.30 V VF and 35 ns trr reduce conduction + switching losses by ~18% versus standard FRDs, improving efficiency at 200–300 kHz. | Use Scenario: Output stage rectification in 1–3 kW solar microinverters with transformerless topology. IC Role / Device Role / Timing Role: Unidirectional current path converting high-frequency AC from H-bridge to DC; rated for 500 V blocking and 125 A surge. Use Value: 2.2°C/W RθJC and TO-263AB footprint support direct mounting to aluminum baseplate, enabling passive cooling without forced air. |
| Freewheeling Diodes | Industrial Motor Drives |
Use Scenario: Inductive load flyback protection in 24–48 V BLDC gate driver stages and solenoid drivers. IC Role / Device Role / Timing Role: Clamps inductive kickback spikes during MOSFET turn-off; conducts brief high-current pulses. Use Value: 125 A IFSM rating safely absorbs energy from 10 mH loads switching at 20 kHz, preventing voltage overshoot beyond 500 V. | Use Scenario: Auxiliary power supply rectification in VFD front-end PFC and control board supplies. IC Role / Device Role / Timing Role: Input rectifier for 30–50 W auxiliary SMPS feeding gate drivers, sensors, and MCU rails. Use Value: Glass passivation and J-STD-020 Level 1 moisture rating ensure long-term reliability in humid factory environments without bake-out. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar super-fast rectifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STTH8R06DJF | 600 V VRRM, VF = 1.45 V @ 8A, trr = 30 ns, same TO-263AB package | Higher blocking voltage but higher VF increases conduction loss in 400–500 V systems | Prefer when system requires margin above 500 V or tighter trr tolerance is needed |
| MBR850CT | 50 V VRRM, dual common-cathode Schottky, VF = 0.75 V @ 8A, no reverse recovery | Not suitable for 500 V circuits; limited to low-voltage OR-ing or secondary-side sync rectification | Select only for <100 V applications where ultra-low VF outweighs voltage limitation |
Compared with STTH8R06DJF, SFAS805G offers lower VF and better thermal resistance but less voltage margin; versus MBR850CT, it trades Schottky efficiency for 10× higher VRRM - making SFAS805G the optimal choice for 500 V industrial SMPS where both voltage headroom and thermal performance matter.
Availability
SFAS805G is available at Aetrix Electronics and suitable for DC–DC converters, switching inverters, and freewheeling applications requiring stable component supply, consistent parametric performance, and long-term industrial availability.
Supply support for SFAS805G 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 industrial, computing, and power electronics markets since 1979.
The SFAS805G belongs to TSC's SFAS super-fast rectifier family, engineered specifically for high-efficiency, high-reliability power conversion in space-constrained industrial and telecom power supplies.
FAQ
What is the maximum junction temperature rating for SFAS805G?
The SFAS805G has a maximum junction temperature (TJ MAX) of +150°C, verified per absolute maximum ratings table. This allows reliable operation in high-ambient environments such as enclosed power supplies or motor drive cabinets. Derating curves confirm 8 A continuous current is sustainable up to TC = 110°C, meaning SFAS805G can maintain full rating with proper heatsinking even in 60°C ambient conditions.
Is SFAS805G pin-compatible with other parts in the SFAS801G–SFAS808G series?
Yes, all SFAS801G through SFAS808G share identical TO-263AB (D2PAK) mechanical outline, pin assignment, and thermal pad layout. SFAS805G uses the same Anode–NC–Cathode pinout and mounting footprint as SFAS801G–SFAS808G, enabling voltage-rating swaps on existing PCBs without layout changes - provided thermal and electrical margins remain acceptable for the new VRRM level.
Does SFAS805G meet lead-free and RoHS requirements?
Yes, SFAS805G is fully RoHS compliant and halogen-free per IEC 61249-2-21. Its matte tin-plated leads are solderable per J-STD-002, and the molding compound meets UL 94V-0 flammability rating. Moisture sensitivity is rated Level 1 (J-STD-020), eliminating bake requirements prior to reflow assembly.
What is the reverse recovery time (trr) specification for SFAS805G, and under what test conditions?
SFAS805G has a maximum reverse recovery time (trr) of 35 ns, measured at IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A per JEDEC-standard test circuit. This value is confirmed across the SFAS805G–SFAS808G group and reflects typical performance at room temperature - critical for minimizing switching loss in 200–500 kHz power converters.
Can SFAS805G be used as a direct replacement for SFAS806G in a 500 V design?
No - SFAS806G is rated for 600 V VRRM, while SFAS805G is rated for 500 V. Although both share identical package, pinout, VF, and trr, substituting SFAS805G in a design originally qualified for SFAS806G may violate voltage safety margin requirements. Always verify system-level peak reverse transients and derating before interchanging SFAS805G and SFAS806G.
SFAS805G 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:
- Standard
- Voltage - DC Reverse (Vr) (Max):
- 300 V
- Current - Average Rectified (Io):
- 8A
- Voltage - Forward (Vf) (Max) @ If:
- 1.3 V @ 8 A
- Speed:
- Fast Recovery =< 500ns, > 200mA (Io)
- Reverse Recovery Time (trr):
- 35 ns
- Current - Reverse Leakage @ Vr:
- 10 µA @ 300 V
- Capacitance @ Vr, F:
- 60pF @ 4V, 1MHz
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263AB (D2PAK)
- Operating Temperature - Junction:
- -55°C ~ 150°C
SFAS805G FAQ
1.How can I place an order for SFAS805G through Aetrix?
Please submit a Request for Quotation (RFQ) for SFAS805G 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 SFAS805G reliable?
The price and inventory of SFAS805G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SFAS805G is usually 5 days.
3.What payment methods are accepted for SFAS805G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SFAS805G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SFAS805G?
SFAS805G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SFAS805G 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 SFAS805G?
For technical support, including SFAS805G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SFAS805G requirements.
6.How does Aetrix verify that SFAS805G is sourced from the original manufacturer or authorized distributors?
All SFAS805G 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 SFAS805G meets industry standards.
7.What is the process for return or replacement of SFAS805G?
All SFAS805G units undergo pre-shipment inspection (PSI). If there is an issue with SFAS805G, 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 SFAS805G part is unused and in its original packaging.
Return procedure for SFAS805G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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