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Home > Products > Discrete Semiconductor Products > Diodes > Rectifiers > Single Diodes

Taiwan Semiconductor Corporation SFAS808G

Name: SFAS808G
Brand: Taiwan Semiconductor Corporation
SKU: SFAS808G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SFAS808G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: SFAS808G.pdf

Description:: DIODE GEN PURP 600V 8A TO263AB

Quantity:: RFQ Add To RFQ list

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Inventory:2,347

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Product details

Overview

SFAS808G from Taiwan Semiconductor is an 8A, 600V super fast surface-mount rectifier in TO-263AB (D2PAK) package, featuring 1.70V max forward voltage at 8A and 35ns reverse recovery time. It serves as a high-efficiency freewheeling or output rectifier in high-frequency switching power supplies operating up to 150°C junction temperature.

For engineers reviewing the SFAS808G datasheet, SFAS808G pinout, SFAS808G application, or SFAS808G equivalent, key selection criteria include its 600V V_RRM, low 2.2°C/W junction-to-case thermal resistance, 125A non-repetitive surge rating, and halogen-free, RoHS-compliant construction suitable for automated SMT assembly.

Technical Context

This device is a single-die, glass-passivated silicon PN junction rectifier optimized for high-speed switching. Its 35ns trr and low 60pF junction capacitance enable operation in DC-DC converters above 100kHz while minimizing switching losses and EMI generation.

The SFAS808G operates with rated 8A average forward current and sustains 125A surge under 8.3ms half-sine conditions. Thermal performance is defined by R_θJC = 2.2°C/W, supporting high-power density designs when mounted on adequately sized copper planes.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	600 V - maximum repetitive reverse voltage before breakdown; defines safe blocking capability in 400–600V bus applications
I_F	8 A - continuous average forward current at T_C = 110°C; determines steady-state conduction capacity
I_FSM	125 A - peak non-repetitive surge current; supports inrush and transient overload handling
V_F	1.70 V max @ 8A, 25°C - forward voltage drop directly impacts conduction loss and thermal design
t_rr	35 ns - reverse recovery time; critical for minimizing switching loss and ringing in hard-switched topologies
R_θJC	2.2 °C/W - junction-to-case thermal resistance; enables accurate heatsink sizing and thermal margin analysis
C_J	60 pF @ 1MHz, 4V - junction capacitance affects high-frequency turn-off behavior and snubber design

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 terminal for forward conduction	Connected to lower-potential side (e.g., switch node or ground return); carries full load current during conduction
Cathode (Tab + Lead 3)	Output terminal for forward conduction	Exposed metal tab serves as primary cathode connection and thermal path; must be soldered to large copper area for heat dissipation
NC (Lead 1)	No connection	Unused lead; electrically isolated and not bonded internally - omitted in layout to reduce parasitic inductance

Key Features

Feature	Design Value
Glass passivated junction	Ensures long-term reliability and stable leakage performance under humid or high-bias stress conditions
Moisture sensitivity level 1	Eliminates bake requirement prior to reflow; compatible with standard J-STD-020 SMT processes
Matte tin-plated leads	Guarantees solderability per J-STD-002 and prevents whisker growth per JESD201 Class 2
UL 94V-0 molding compound	Meets flame-retardant safety requirements for industrial and power supply end equipment
Halogen-free construction	Complies with IEC 61249-2-21; supports environmental compliance and safer thermal decomposition

Applications

DC-DC Converter Output Rectification	Switching Mode Inverter Freewheeling
Use Scenario: High-efficiency secondary-side rectification in isolated 48V–600V output DC-DC converters operating at 100–500kHz. IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer secondary AC to regulated DC; conducts during positive half-cycle only. Use Value: 35ns t_rr and 1.70V V_F minimize switching and conduction losses, improving overall converter efficiency by ≥0.8% at 8A load.	Use Scenario: Freewheeling path for inductive loads in motor drive inverters and UPS systems with 400–600V DC bus. IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during MOSFET/IGBT off-time to clamp inductive kickback. Use Value: 125A I_FSM withstands motor startup surges; 600V V_RRM ensures safe blocking during bus overvoltage transients.
High-Frequency SMPS Secondary Side	Industrial Power Supply Input Bridge
Use Scenario: Output rectification in compact, high-density telecom and server PSUs where thermal management is constrained. IC Role / Device Role / Timing Role: Primary conduction element delivering regulated 12V/24V/48V outputs; thermally coupled to PCB ground plane via cathode tab. Use Value: 2.2°C/W R_θJC enables >7W power dissipation with ≤15°C rise above case, reducing need for external heatsinks.	Use Scenario: Single-diode replacement in discrete bridge configurations for 300–600V input industrial power supplies. IC Role / Device Role / Timing Role: Standalone high-voltage rectifier used in half-wave or voltage-doubler topologies requiring robust surge immunity. Use Value: 125A I_FSM and 150°C T_JMAX support reliable operation during line surges and brownouts without derating.

DC-DC Converter Output Rectification

Switching Mode Inverter Freewheeling

Use Scenario: High-efficiency secondary-side rectification in isolated 48V–600V output DC-DC converters operating at 100–500kHz.

IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer secondary AC to regulated DC; conducts during positive half-cycle only.

Use Value: 35ns t_rr and 1.70V V_F minimize switching and conduction losses, improving overall converter efficiency by ≥0.8% at 8A load.

Use Scenario: Freewheeling path for inductive loads in motor drive inverters and UPS systems with 400–600V DC bus.

IC Role / Device Role / Timing Role: Provides low-loss current recirculation path during MOSFET/IGBT off-time to clamp inductive kickback.

Use Value: 125A I_FSM withstands motor startup surges; 600V V_RRM ensures safe blocking during bus overvoltage transients.

High-Frequency SMPS Secondary Side

Industrial Power Supply Input Bridge

Use Scenario: Output rectification in compact, high-density telecom and server PSUs where thermal management is constrained.

IC Role / Device Role / Timing Role: Primary conduction element delivering regulated 12V/24V/48V outputs; thermally coupled to PCB ground plane via cathode tab.

Use Value: 2.2°C/W R_θJC enables >7W power dissipation with ≤15°C rise above case, reducing need for external heatsinks.

Use Scenario: Single-diode replacement in discrete bridge configurations for 300–600V input industrial power supplies.

IC Role / Device Role / Timing Role: Standalone high-voltage rectifier used in half-wave or voltage-doubler topologies requiring robust surge immunity.

Use Value: 125A I_FSM and 150°C T_JMAX support reliable operation during line surges and brownouts without derating.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage fast rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH8R06DJF	600V V_RRM, 8A I_F, 30ns t_rr, TO-263AB package, but VF = 1.85V max @ 8A	Higher V_F increases conduction loss by ~0.15V; slightly faster recovery	Prefer SFAS808G where lower forward loss dominates thermal budget; STTH8R06DJF where ultra-fast recovery is prioritized
VS-8EWH06FN-M3	600V V_RRM, 8A I_F, 35ns t_rr, VF = 1.75V max @ 8A, same TO-263AB package	Nearly identical electrical specs; differs in moisture sensitivity (MSL 1 vs MSL 3) and qualification standards	SFAS808G offers MSL 1 advantage for no-bake assembly; VS-8EWH06FN-M3 may require dry-pack handling

Compared with STTH8R06DJF and VS-8EWH06FN-M3, the SFAS808G delivers the lowest forward voltage in its class (1.70V max), superior thermal resistance (2.2°C/W), and guaranteed MSL 1 handling - making it optimal for high-efficiency, high-volume SMT production where thermal margin and process simplicity are critical.

Availability

SFAS808G is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and industrial power supplies requiring stable component supply, consistent parametric performance across production lots, and long-term manufacturability assurance.

Supply support for SFAS808G 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 global industrial, computing, and consumer markets since 1979.

The SFAS808G belongs to TSC's Super Fast Rectifier product line, engineered specifically for high-frequency switching power conversion where low V_F, fast t_rr, and robust surge capability are essential for efficiency and reliability.

FAQ

What is the maximum junction temperature rating for the SFAS808G?

The SFAS808G has a maximum junction temperature (T_J) of +150°C, verified per absolute maximum ratings in the official TSC datasheet Version N2103. This rating applies under continuous operation with proper thermal management - including adequate copper area under the cathode tab - and allows reliable use in high-ambient industrial environments where case temperatures reach 110°C.

Does the SFAS808G have a specified moisture sensitivity level (MSL)?

Yes, the SFAS808G is rated MSL Level 1 per J-STD-020, meaning it can be stored indefinitely at ambient conditions and requires no baking prior to reflow soldering. This simplifies manufacturing flow and eliminates moisture-related popcorning risk during standard SMT assembly, unlike higher-MSL alternatives that mandate dry-pack storage and pre-bake protocols.

What is the reverse recovery time (t_rr) of the SFAS808G, and under what test conditions is it measured?

The SFAS808G has a reverse recovery time (t_rr) of 35ns maximum, measured under IF = 0.5A, IR = 1.0A, and Irr = 0.25A per the TSC datasheet. This value reflects performance in hard-switched topologies and enables efficient operation in 100–500kHz power converters where fast diode turn-off minimizes switching loss and voltage overshoot.

Is the SFAS808G halogen-free and RoHS compliant?

Yes, the SFAS808G is both RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound contains no brominated or chlorinated flame retardants, and all homogeneous materials meet EU RoHS Directive 2011/65/EU limits for lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE. Full compliance documentation is available upon request.

What is the junction-to-case thermal resistance (R_θJC) of the SFAS808G, and how does it impact thermal design?

The SFAS808G has a typical junction-to-case thermal resistance (R_θJC) of 2.2°C/W, measured from die junction to the cathode tab surface. This low value enables direct thermal coupling to PCB copper; for example, with 8A conduction and 1.70V V_F, power dissipation is ~13.6W, resulting in only ~30°C junction-to-case rise - significantly easing thermal design versus higher-R_θJC alternatives.

SFAS808G 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):: 600 V

Current - Average Rectified (Io):: 8A

Voltage - Forward (Vf) (Max) @ If:: 1.7 V @ 8 A

Speed:: Fast Recovery =< 500ns, > 200mA (Io)

Reverse Recovery Time (trr):: 35 ns

Current - Reverse Leakage @ Vr:: 10 µA @ 600 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

SFAS808G FAQ

1.How can I place an order for SFAS808G through Aetrix?

Please submit a Request for Quotation (RFQ) for SFAS808G 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 SFAS808G reliable?

The price and inventory of SFAS808G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SFAS808G is usually 5 days.

3.What payment methods are accepted for SFAS808G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SFAS808G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SFAS808G?

SFAS808G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SFAS808G 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 SFAS808G?

For technical support, including SFAS808G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SFAS808G requirements.

6.How does Aetrix verify that SFAS808G is sourced from the original manufacturer or authorized distributors?

All SFAS808G 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 SFAS808G meets industry standards.

7.What is the process for return or replacement of SFAS808G?

All SFAS808G units undergo pre-shipment inspection (PSI). If there is an issue with SFAS808G, 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 SFAS808G part is unused and in its original packaging.

Return procedure for SFAS808G:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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