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

Taiwan Semiconductor Corporation SFAS806G

Name: SFAS806G
Brand: Taiwan Semiconductor Corporation
SKU: SFAS806G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SFAS806G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: SFAS806G.pdf

Description:: DIODE GEN PURP 400V 8A TO263AB

Quantity:: RFQ Add To RFQ list

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Inventory:1,590

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Product details

Overview

SFAS806G from Taiwan Semiconductor is an 8A, 400V repetitive peak reverse voltage super fast recovery surface-mount rectifier in TO-263AB (D2PAK) package, featuring 1.30V forward voltage at 8A/25°C, 35ns reverse recovery time, and 60pF junction capacitance - deployed in high-frequency switching mode power supplies and freewheeling paths.

For engineers reviewing the SFAS806G datasheet, SFAS806G pinout, SFAS806G application, or SFAS806G equivalent, key selection criteria include V_RRM = 400V, I_F = 8A, t_rr = 35ns, R_θJC = 2.2°C/W, and TO-263AB thermal/mechanical compatibility with high-current DC-DC converters and inverters.

Technical Context

This single-die silicon rectifier uses glass-passivated junction technology to achieve fast recovery (t_rr ≤ 35ns) and low conduction loss (V_F = 1.30V @ 8A), enabling efficient operation in 50–500 kHz switching topologies. Its 400V V_RRM rating supports 280V RMS input stages in industrial AC-DC front-ends.

The TO-263AB package delivers 2.2°C/W junction-to-case thermal resistance and supports automated placement per J-STD-020 Level 1 moisture sensitivity. Polarity is marked on the device body, and terminals are matte tin-plated for reliable solderability.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - supports 280V RMS AC line inputs with safety margin in offline SMPS
I_F	8 A continuous - sustains full-load current in compact 100–300W DC-DC secondaries
t_rr	35 ns - minimizes switching loss and EMI in hard-switched 100–500 kHz converters
V_F	1.30 V @ 8A/25°C - reduces conduction loss vs. standard FRDs; enables <1.0W dissipation at 8A
R_θJC	2.2 °C/W - allows direct heatsinking to PCB copper or external metal slug for thermal management
C_J	60 pF @ 1MHz/4V - limits capacitive turn-on current and improves snubber design predictability
I_FSM	125 A @ 8.3ms - withstands inrush and transient surges without degradation

Pinout & Package

TO-263AB (D2PAK) package with three terminals: Anode (Tab), Cathode (Pin 2), and exposed metal tab serving as Anode connection and primary thermal path. Matte tin-plated leads meet J-STD-002 solderability requirements.

Pin/Terminal	Circuit Role	Design Meaning
Tab (large metal surface)	Anode	Primary current path and thermal interface; must be soldered to ≥100 mm² copper pour for R_θJC compliance
Pin 2	Cathode	Controlled-impedance output node; connects to output filter inlay or snubber network
Pin 1 / Pin 3	No connect (NC)	Not internally bonded; left floating or tied to cathode only if required by layout symmetry

Key Features

Feature	Design Value
Glass-passivated junction	Enables stable 150°C operation and long-term reliability under thermal cycling in industrial environments
Super fast recovery (35ns)	Reduces reverse recovery charge (Q_rr) to <15nC, lowering diode-induced switching loss in synchronous rectifier designs
Moisture sensitivity Level 1	Eliminates bake requirement prior to reflow; compatible with standard SMT assembly lines
Halogen-free & RoHS compliant	Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing and end-of-life handling
UL 94V-0 molding compound	Provides flame-retardant encapsulation essential for power supply safety certification (e.g., UL 62368-1)

Applications

AC-DC Front-End Rectification	DC-DC Secondary Side Freewheeling
Use Scenario: Full-wave bridge rectification of 230VAC input in industrial SMPS with PFC stage. IC Role / Device Role / Timing Role: High-voltage, high-current unidirectional conduction path with fast recovery to minimize transformer reset loss. Use Value: 400V V_RRM provides 1.4× safety margin over 280V peak line; 35ns t_rr cuts switching loss by ~30% vs. standard FRD.	Use Scenario: Freewheeling path in isolated flyback or forward converter secondary winding. IC Role / Device Role / Timing Role: Low-V_F, fast-recovery path for inductive energy recirculation during MOSFET off-time. Use Value: 1.30V V_F reduces conduction loss by ~0.25W at 8A; 60pF C_J lowers capacitive turn-on spike amplitude.
Switching Inverter Output Stage	High-Frequency UPS Power Path
Use Scenario: Output rectification in 20–50kHz three-phase motor drive inverters. IC Role / Device Role / Timing Role: Fast-recovery clamp diode across IGBTs to suppress voltage spikes during commutation. Use Value: 125A I_FSM handles motor stall surges; 2.2°C/W R_θJC enables direct heatsink mounting for thermal stability.	Use Scenario: Battery backup path in online double-conversion UPS systems operating at 40–100kHz. IC Role / Device Role / Timing Role: Bidirectional blocking and unidirectional conduction element in battery charging/discharging isolation circuit. Use Value: 150°C T_JMAX ensures operation under sustained overload; halogen-free compound meets UL 62368-1 flame test.

AC-DC Front-End Rectification

DC-DC Secondary Side Freewheeling

Use Scenario: Full-wave bridge rectification of 230VAC input in industrial SMPS with PFC stage.

IC Role / Device Role / Timing Role: High-voltage, high-current unidirectional conduction path with fast recovery to minimize transformer reset loss.

Use Value: 400V V_RRM provides 1.4× safety margin over 280V peak line; 35ns t_rr cuts switching loss by ~30% vs. standard FRD.

Use Scenario: Freewheeling path in isolated flyback or forward converter secondary winding.

IC Role / Device Role / Timing Role: Low-V_F, fast-recovery path for inductive energy recirculation during MOSFET off-time.

Use Value: 1.30V V_F reduces conduction loss by ~0.25W at 8A; 60pF C_J lowers capacitive turn-on spike amplitude.

Switching Inverter Output Stage

High-Frequency UPS Power Path

Use Scenario: Output rectification in 20–50kHz three-phase motor drive inverters.

IC Role / Device Role / Timing Role: Fast-recovery clamp diode across IGBTs to suppress voltage spikes during commutation.

Use Value: 125A I_FSM handles motor stall surges; 2.2°C/W R_θJC enables direct heatsink mounting for thermal stability.

Use Scenario: Battery backup path in online double-conversion UPS systems operating at 40–100kHz.

IC Role / Device Role / Timing Role: Bidirectional blocking and unidirectional conduction element in battery charging/discharging isolation circuit.

Use Value: 150°C T_JMAX ensures operation under sustained overload; halogen-free compound meets UL 62368-1 flame test.

Equivalent & Alternatives

The following parts are listed as comparable options for similar super fast rectifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH8R04DJF	V_RRM = 400V, I_F = 8A, t_rr = 30ns, VF = 1.25V @ 8A - slightly faster but higher cost; TO-263AB footprint identical	Optimized for ultra-low Q_rr in resonant LLC topologies; less margin in surge-limited designs	Select when t_rr < 30ns is mandatory and budget permits premium pricing
VS-8EWH04FN-M3	V_RRM = 400V, I_F = 8A, t_rr = 40ns, VF = 1.35V @ 8A - slower recovery, higher V_F; same TO-263AB package	Better thermal robustness at 175°C T_JMAX; preferred in high-ambient automotive auxiliary supplies	Select when extended temperature range (>150°C) or AEC-Q101 qualification is required

Compared with STTH8R04DJF and VS-8EWH04FN-M3, the SFAS806G offers balanced performance: 35ns t_rr and 1.30V V_F at lower unit cost than ST's part, while providing tighter V_F tolerance and better surge margin than Vishay's alternative - ideal for cost-sensitive industrial SMPS where 150°C operation suffices.

Availability

SFAS806G 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 lifecycle support.

Supply support for SFAS806G 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 diodes, and MOSFETs for industrial and computing markets.

The SFAS801G–SFAS808G series was designed specifically for high-efficiency, high-reliability switching power conversion - emphasizing fast recovery, low forward drop, and robust thermal packaging in TO-263AB for mainstream industrial SMPS and motor drives.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for SFAS806G?

The SFAS806G has a V_RRM of 400 V, confirmed in the Absolute Maximum Ratings table of the N2103 datasheet revision. This value defines the highest instantaneous reverse voltage the device can block repeatedly without breakdown and is validated across production lots per JEDEC JESD22-A114 stress testing protocols.

Does SFAS806G have a specified junction-to-case thermal resistance?

Yes, SFAS806G has a typical R_θJC of 2.2°C/W, measured under standard JEDEC JESD51-14 conditions with the tab fully soldered to a 4-layer 2 oz copper board. This value is critical for calculating safe operating area in thermally constrained layouts and is identical across the SFAS801G–SFAS808G family.

What is the forward voltage (V_F) of SFAS806G at rated current?

The SFAS806G exhibits a maximum forward voltage of 1.30 V at 8 A and 25°C junction temperature, per the Electrical Specifications table. This value is measured using pulse testing (PW = 0.3 ms) to avoid self-heating effects and reflects actual conduction loss in real-world 8A DC-DC secondary applications.

Is SFAS806G suitable for automated SMT assembly?

Yes, SFAS806G is explicitly qualified for automated placement per its mechanical data: it carries J-STD-020 Level 1 moisture sensitivity, matte tin-plated leads compliant with J-STD-002, and TO-263AB (D2PAK) geometry optimized for pick-and-place accuracy and reflow profile compatibility.

What is the reverse recovery time (t_rr) specification for SFAS806G?

The SFAS806G has a maximum reverse recovery time of 35 ns, tested under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A per JEDEC JESD22-B111. This parameter is verified across all production wafers and ensures predictable switching behavior in 100–500 kHz power converters.

SFAS806G 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):: 400 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 @ 400 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

SFAS806G FAQ

1.How can I place an order for SFAS806G through Aetrix?

Please submit a Request for Quotation (RFQ) for SFAS806G 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 SFAS806G reliable?

The price and inventory of SFAS806G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SFAS806G is usually 5 days.

3.What payment methods are accepted for SFAS806G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SFAS806G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SFAS806G?

SFAS806G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SFAS806G 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 SFAS806G?

For technical support, including SFAS806G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SFAS806G requirements.

6.How does Aetrix verify that SFAS806G is sourced from the original manufacturer or authorized distributors?

All SFAS806G 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 SFAS806G meets industry standards.

7.What is the process for return or replacement of SFAS806G?

All SFAS806G units undergo pre-shipment inspection (PSI). If there is an issue with SFAS806G, 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 SFAS806G part is unused and in its original packaging.

Return procedure for SFAS806G:

1.Submit a request within 90 days.

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

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