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

Taiwan Semiconductor Corporation SFAF803G

Name: SFAF803G
Brand: Taiwan Semiconductor Corporation
SKU: SFAF803G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SFAF803G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: TO-220-2 Full Pack

Datasheet:: SFAF803G.pdf

Description:: 35NS, 8A, 150V, SUPER FAST RECOV

Quantity:: RFQ Add To RFQ list

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Inventory:6,234

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Product details

Overview

SFAF803G from Taiwan Semiconductor is an 8A, 150V repetitive peak reverse voltage super fast rectifier diode in ITO-220AC package, featuring 35ns reverse recovery time, 0.95V forward voltage at 8A/25°C, and 4°C/W junction-to-case thermal resistance-used in high-frequency DC-DC converters and freewheeling paths.

For engineers reviewing the SFAF803G datasheet, SFAF803G pinout, SFAF803G application, or SFAF803G equivalent, key selection criteria include V_RRM = 150V, I_F = 8A, t_rr = 35ns, V_F = 0.95V, and thermal performance for switching-mode power supply snubber and flyback diode placement.

Technical Context

The SFAF803G is a single-die, glass-passivated super fast recovery rectifier optimized for high-efficiency switching applications. Its 35ns reverse recovery time and low 0.95V forward voltage at rated current reduce conduction and switching losses in high-frequency topologies.

Designed with UL 94V-0 molding compound and matte tin-plated leads compliant with J-STD-002, the device supports automotive-grade reliability (AEC-Q101 optional) and meets JESD201 Class 2 whisker resistance-critical for industrial and automotive power conversion environments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	150 V - Maximum non-repetitive reverse blocking voltage; defines safe operating range in flyback/freewheeling circuits
I_F	8 A - Continuous average forward current; sets minimum heatsink sizing and PCB copper area requirements
t_rr	35 ns - Reverse recovery time; enables operation up to ~3 MHz switching frequency without excessive ringing or loss
V_F	0.95 V @ 8A, 25°C - Forward voltage drop; directly determines conduction loss (P_cond ≈ 7.6W at full load)
R_θJC	4 °C/W - Junction-to-case thermal resistance; allows accurate junction temperature estimation under forced-air or bolted heatsink conditions
C_J	90 pF @ 4V - Junction capacitance; impacts EMI generation and gate-drive interaction in synchronous rectifier layouts

Pinout & Package

Package: ITO-220AC - 3-terminal through-hole package with isolated tab (cathode-connected), UL 94V-0 molded body, matte tin-plated leads, and 0.56 N·m maximum mounting torque.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Input current terminal	Connected to source of energy (e.g., transformer secondary or switch node); must withstand surge current up to 125A
Cathode	Output current terminal	Connected to output rail or ground return; electrically tied to metal tab for thermal path and EMI shielding
Tab (Cathode)	Thermal & electrical reference	Isolated metal surface for heatsinking; cathode potential must be maintained across entire thermal interface

Key Features

Feature	Design Value
Super fast recovery	35 ns t_rr enables high-frequency operation (>500 kHz) with minimal switching loss and voltage overshoot
Glass passivated junction	Enhances moisture resistance and long-term reliability under thermal cycling and humid environments
Low forward voltage	0.95 V at 8A reduces conduction loss by ~15% vs. standard fast rectifiers with V_F > 1.1V
AEC-Q101 qualified option	SFAF803GH variant available for automotive power modules requiring stress-tested component qualification

Applications

DC-DC Converter Output Rectification	Switching Mode Inverter Freewheeling
Use Scenario: Secondary-side rectification in isolated 48V–12V buck-derived DC-DC converters operating at 300–600 kHz. IC Role / Device Role / Timing Role: Unidirectional current steering diode handling continuous 8A output with minimal voltage drop and fast turn-off to prevent cross-conduction. Use Value: 0.95V V_F and 35ns t_rr reduce total power loss by ≥1.2W versus legacy FR107-based designs at 8A.	Use Scenario: Freewheeling path in half-bridge motor drive inverters powering 3-phase BLDC fans or pumps. IC Role / Device Role / Timing Role: Clamp-inductive kickback during high-side switch off; requires low stored charge and rapid reverse recovery. Use Value: 90pF junction capacitance and 35ns t_rr suppress voltage spikes <150V under 125A surge, avoiding overvoltage failure.
Industrial SMPS Snubber Diode	Automotive HVAC Power Supply
Use Scenario: RCD snubber network in 1–3 kW telecom rectifiers where diode absorbs leakage inductance energy. IC Role / Device Role / Timing Role: Transient energy clamp diode conducting brief high-current pulses (<1µs) with minimal recovery tail. Use Value: 125A I_FSM rating and 4°C/W R_θJC allow reliable pulse handling without thermal runaway.	Use Scenario: 12V auxiliary power supply in vehicle cabin HVAC control modules with ambient temperatures up to 105°C. IC Role / Device Role / Timing Role: Main output rectifier in isolated flyback converter meeting AEC-Q101 requirements when ordered as SFAF803GH. Use Value: -55°C to +150°C operating range and JESD201 Class 2 whisker resistance ensure field longevity under thermal shock.

DC-DC Converter Output Rectification

Switching Mode Inverter Freewheeling

Use Scenario: Secondary-side rectification in isolated 48V–12V buck-derived DC-DC converters operating at 300–600 kHz.

IC Role / Device Role / Timing Role: Unidirectional current steering diode handling continuous 8A output with minimal voltage drop and fast turn-off to prevent cross-conduction.

Use Value: 0.95V V_F and 35ns t_rr reduce total power loss by ≥1.2W versus legacy FR107-based designs at 8A.

Use Scenario: Freewheeling path in half-bridge motor drive inverters powering 3-phase BLDC fans or pumps.

IC Role / Device Role / Timing Role: Clamp-inductive kickback during high-side switch off; requires low stored charge and rapid reverse recovery.

Use Value: 90pF junction capacitance and 35ns t_rr suppress voltage spikes <150V under 125A surge, avoiding overvoltage failure.

Industrial SMPS Snubber Diode

Automotive HVAC Power Supply

Use Scenario: RCD snubber network in 1–3 kW telecom rectifiers where diode absorbs leakage inductance energy.

IC Role / Device Role / Timing Role: Transient energy clamp diode conducting brief high-current pulses (<1µs) with minimal recovery tail.

Use Value: 125A I_FSM rating and 4°C/W R_θJC allow reliable pulse handling without thermal runaway.

Use Scenario: 12V auxiliary power supply in vehicle cabin HVAC control modules with ambient temperatures up to 105°C.

IC Role / Device Role / Timing Role: Main output rectifier in isolated flyback converter meeting AEC-Q101 requirements when ordered as SFAF803GH.

Use Value: -55°C to +150°C operating range and JESD201 Class 2 whisker resistance ensure field longevity under thermal shock.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH8R06D	V_RRM = 600V, t_rr = 35ns, V_F = 1.7V @ 8A - higher V_RRM, higher V_F	Higher voltage margin but 85% higher conduction loss at 8A	Select only if system requires >150V blocking; otherwise SFAF803G offers better efficiency at 150V class
ON Semi MUR860E	V_RRM = 600V, t_rr = 35ns, V_F = 1.75V @ 8A - same speed, higher V_F, TO-220AC package	Compatible footprint but higher thermal resistance (5.5°C/W) and lower surge rating (100A)	Acceptable for cost-sensitive 150V designs only if heatsinking accommodates higher R_θJC and lower I_FSM

Compared with STTH8R06D and MUR860E, the SFAF803G delivers optimal balance of low V_F (0.95V), tight V_RRM (150V), and robust 125A surge capability-making it preferred for efficiency-critical 12–48V industrial and automotive DC-DC outputs.

Availability

SFAF803G is available at Aetrix Electronics and suitable for DC-DC converter output rectification, switching mode inverter freewheeling, and industrial SMPS snubber applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.

Supply support for SFAF803G 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 automotive markets since 1979.

The SFAF80xG series belongs to TSC's Super Fast Rectifier product line, engineered specifically for high-frequency, high-reliability power conversion systems where low V_F, fast t_rr, and robust surge capability are critical.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for the SFAF803G?

The SFAF803G has a V_RRM of 150 V, as confirmed in the Absolute Maximum Ratings table on page 2 of the L2106 datasheet. This value is fixed per marking code and applies across all operating temperatures. Exceeding 150 V risks avalanche breakdown and irreversible junction damage. The SFAF803G is not interchangeable with SFAF804G (200 V) or SFAF802G (100 V) without circuit revalidation.

Does the SFAF803G have AEC-Q101 qualification?

The base SFAF803G is not AEC-Q101 qualified; however, the SFAF803GH variant-identical in all electrical and thermal specifications-is explicitly qualified per AEC-Q101 Rev D. The "H" suffix denotes automotive qualification, including extended temperature cycling, high-temperature operating life, and biased HAST testing. Always verify ordering code suffix before automotive use.

What is the forward voltage (V_F) of the SFAF803G at 8A and 25°C?

The SFAF803G exhibits a typical forward voltage of 0.95 V at I_F = 8 A and T_J = 25°C, per the Electrical Specifications table on page 2 of the L2106 datasheet. This value is measured under pulsed conditions (PW = 0.3 ms) and represents the conduction loss baseline for thermal design. At 100°C junction temperature, V_F decreases to approximately 0.82 V.

What is the reverse recovery time (t_rr) and how is it tested for the SFAF803G?

The SFAF803G has a maximum reverse recovery time of 35 ns, measured under IF = 0.5 A, IR = 1.0 A, and Irr = 0.25 A, as specified in the Electrical Specifications table. Test conditions follow JEDEC-standard waveforms and are validated using the circuit diagram shown in Figure 6 of the datasheet. This t_rr enables clean commutation in 300–600 kHz switching converters.

What package type does the SFAF803G use and what are its mechanical highlights?

The SFAF803G uses the ITO-220AC package: a 3-terminal through-hole outline with isolated metal tab (cathode-connected), UL 94V-0 flammability-rated epoxy, and matte tin-plated leads compliant with J-STD-002 solderability. Mounting torque must not exceed 0.56 N·m, and polarity is marked on the device body per the Marking Diagram on page 5.

SFAF803G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: TO-220-2 Full Pack

Packaging:: Tube

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 150 V

Current - Average Rectified (Io):: 8A

Voltage - Forward (Vf) (Max) @ If:: 950 mV @ 8 A

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

Reverse Recovery Time (trr):: 35 ns

Current - Reverse Leakage @ Vr:: 10 µA @ 150 V

Capacitance @ Vr, F:: 90pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: ITO-220AC

Operating Temperature - Junction:: -55°C ~ 150°C

SFAF803G FAQ

1.How can I place an order for SFAF803G through Aetrix?

Please submit a Request for Quotation (RFQ) for SFAF803G 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 SFAF803G reliable?

The price and inventory of SFAF803G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SFAF803G is usually 5 days.

3.What payment methods are accepted for SFAF803G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SFAF803G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SFAF803G?

SFAF803G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SFAF803G 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 SFAF803G?

For technical support, including SFAF803G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SFAF803G requirements.

6.How does Aetrix verify that SFAF803G is sourced from the original manufacturer or authorized distributors?

All SFAF803G 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 SFAF803G meets industry standards.

7.What is the process for return or replacement of SFAF803G?

All SFAF803G units undergo pre-shipment inspection (PSI). If there is an issue with SFAF803G, 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 SFAF803G part is unused and in its original packaging.

Return procedure for SFAF803G:

1.Submit a request within 90 days.

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

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