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

Taiwan Semiconductor Corporation SFA801G

Name: SFA801G
Brand: Taiwan Semiconductor Corporation
SKU: SFA801G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SFA801G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: TO-220-2

Datasheet:: SFA801G.pdf

Description:: 35NS, 8A, 50V, SUPER FAST RECOVE

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SFA801G from Taiwan Semiconductor is a single-die super fast rectifier diode in TO-220AC package, rated for 50 V repetitive peak reverse voltage (V_RRM), 8 A average forward current (I_F), and 125 A non-repetitive surge current (I_FSM). It delivers low forward voltage drop (0.975 V at 8 A, 25°C) and ultra-fast reverse recovery time (35 ns), making it suitable for high-frequency switching power supplies.

For engineers reviewing the SFA801G datasheet, SFA801G pinout, SFA801G application, or SFA801G equivalent, key selection considerations include its 50 V V_RRM, 4 °C/W junction-to-case thermal resistance, AEC-Q101 qualification availability (SFA801GH variant), TO-220AC mechanical compatibility, and 35 ns trr performance in DC-DC and freewheeling topologies.

Technical Context

The SFA801G employs a planar epitaxial silicon structure optimized for super-fast recovery with minimal minority carrier lifetime control. Its 35 ns reverse recovery time (trr) is measured under standardized conditions (I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A), enabling efficient operation in 100 kHz–500 kHz switching converters.

Thermally, the device features a low R_θJC of 4 °C/W and operates across –55°C to +150°C junction temperature range. Its 100 pF junction capacitance at 1 MHz / 4.0 V reverse bias supports stable high-frequency waveform integrity in snubberless designs.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - Maximum repetitive reverse blocking voltage; defines usable input voltage headroom in 24–48 V DC-DC stages
I_F	8 A - Continuous average forward current at case temperature ≤ 100°C; sets conduction capability in primary-side rectification
I_FSM	125 A - Peak non-repetitive surge current (8.3 ms half-sine); withstands inrush and fault transients without failure
V_F	0.975 V @ 8 A, 25°C - Low conduction loss; reduces power dissipation and thermal load in high-duty-cycle operation
t_rr	35 ns - Ultra-fast reverse recovery; minimizes switching losses and EMI generation in hard-switched SMPS
R_θJC	4 °C/W - Efficient heat transfer to heatsink; enables compact thermal design with ≤ 32 W power dissipation at ΔT = 128°C
C_J	100 pF @ 1 MHz, 4 V - Low junction capacitance; preserves high-frequency response and reduces capacitive turn-on loss

Pinout & Package

Package: TO-220AC - 3-lead, single-ended, through-hole molded plastic package with isolated tab (cathode-connected tab), matte tin-plated leads compliant with J-STD-002, UL 94V-0 rated molding compound, and 0.56 N·m maximum mounting torque.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Lead 1)	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck sync rectifier or transformer secondary center-tap)
Cathode (Lead 2)	Forward current exit point	Electrically tied to metal tab; must be insulated from heatsink unless system ground reference permits direct mounting
Tab (Cathode)	Primary heat path & cathode terminal	Provides low-thermal-resistance path to heatsink; polarity marked on device body; requires isolation washer if floating cathode required

Key Features

Feature	Design Value
Super-fast recovery (t_rr = 35 ns)	Enables >300 kHz switching frequencies with low dynamic loss and reduced EMI filter burden
Low V_F (0.975 V @ 8 A)	Reduces conduction loss by ~15% vs. standard FRD counterparts, improving efficiency in 12–48 V output rails
R_θJC = 4 °C/W	Supports ≥32 W continuous power dissipation with 100°C case rise, simplifying heatsink selection for industrial-grade designs
AEC-Q101 qualified option (SFA801GH)	Validated for automotive under-hood applications including engine control DC-DC and ADAS power modules
RoHS & halogen-free (IEC 61249-2-21)	Meets global environmental compliance requirements for industrial, telecom, and consumer end equipment

Applications

DC-DC Converters	Switching Inverters
Use Scenario: Secondary-side synchronous rectification in isolated 48 V–12 V buck-derived DC-DC modules for server PSUs and telecom power shelves. IC Role / Device Role / Timing Role: Fast-recovery power diode providing unidirectional current path during low-side switch off-time; replaces Schottky where higher V_RRM is needed. Use Value: 35 ns t_rr and 0.975 V V_F jointly reduce total power loss by up to 0.8 W per diode versus legacy FRDs at 8 A/200 kHz operation.	Use Scenario: Freewheeling path in three-phase motor drive inverters operating at 8–12 kHz PWM frequency with 48–72 V bus. IC Role / Device Role / Timing Role: Clamp diode across IGBTs or MOSFETs to recirculate inductive current during switching transitions. Use Value: 125 A I_FSM withstands motor stall surges; 100 pF C_J limits capacitive coupling noise into gate drivers.
Industrial SMPS	Automotive Power Modules
Use Scenario: Output rectification in 1 kW industrial AC-DC front-end with active PFC and LLC resonant stage. IC Role / Device Role / Timing Role: High-current, high-reliability rectifier in the 12–24 V auxiliary rail supply, mounted directly to chassis heatsink. Use Value: TO-220AC package with 4 °C/W R_θJC allows direct bolt-down thermal interface; 150°C T_JMAX ensures margin at 85°C ambient.	Use Scenario: 12 V battery backup converter in ADAS domain controllers requiring AEC-Q101 compliance. IC Role / Device Role / Timing Role: Input protection and reverse-polarity blocking diode in always-on power rail, qualified per AEC-Q101 stress tests. Use Value: SFA801GH variant provides validated reliability for 15-year automotive service life; 10 µA I_R at 25°C prevents standby leakage drain.

DC-DC Converters

Switching Inverters

Use Scenario: Secondary-side synchronous rectification in isolated 48 V–12 V buck-derived DC-DC modules for server PSUs and telecom power shelves.

IC Role / Device Role / Timing Role: Fast-recovery power diode providing unidirectional current path during low-side switch off-time; replaces Schottky where higher V_RRM is needed.

Use Value: 35 ns t_rr and 0.975 V V_F jointly reduce total power loss by up to 0.8 W per diode versus legacy FRDs at 8 A/200 kHz operation.

Use Scenario: Freewheeling path in three-phase motor drive inverters operating at 8–12 kHz PWM frequency with 48–72 V bus.

IC Role / Device Role / Timing Role: Clamp diode across IGBTs or MOSFETs to recirculate inductive current during switching transitions.

Use Value: 125 A I_FSM withstands motor stall surges; 100 pF C_J limits capacitive coupling noise into gate drivers.

Industrial SMPS

Automotive Power Modules

Use Scenario: Output rectification in 1 kW industrial AC-DC front-end with active PFC and LLC resonant stage.

IC Role / Device Role / Timing Role: High-current, high-reliability rectifier in the 12–24 V auxiliary rail supply, mounted directly to chassis heatsink.

Use Value: TO-220AC package with 4 °C/W R_θJC allows direct bolt-down thermal interface; 150°C T_JMAX ensures margin at 85°C ambient.

Use Scenario: 12 V battery backup converter in ADAS domain controllers requiring AEC-Q101 compliance.

IC Role / Device Role / Timing Role: Input protection and reverse-polarity blocking diode in always-on power rail, qualified per AEC-Q101 stress tests.

Use Value: SFA801GH variant provides validated reliability for 15-year automotive service life; 10 µA I_R at 25°C prevents standby leakage drain.

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 = 600 V, V_F = 1.7 V @ 8 A, t_rr = 35 ns, TO-220AC	Higher voltage rating but higher V_F; suited for universal-input offline SMPS, not optimized for low-V_R systems	Select when V_RRM > 100 V is required; avoid for 50 V systems due to unnecessary cost and conduction penalty
ON Semi MUR850E	V_RRM = 50 V, V_F = 0.92 V @ 8 A, t_rr = 35 ns, TO-220AC	Nearly identical electrical specs; slightly lower V_F but no AEC-Q101 option available	Preferred for cost-sensitive industrial designs without automotive qualification needs; same footprint and thermal behavior

Compared with STTH8R06D and MUR850E, the SFA801G offers optimal balance of 50 V rating, 0.975 V V_F, and AEC-Q101 availability (as SFA801GH), making it uniquely suited for high-efficiency, automotive-qualified 48 V subsystem rectification where voltage margin and qualification are critical.

Availability

SFA801G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, industrial SMPS, and automotive power modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for SFA801G 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 SFA801G belongs to TSC's Super Fast Rectifier family, engineered specifically for high-frequency switching power conversion where low V_F, fast t_rr, and robust surge capability are essential in space-constrained, thermally demanding environments.

FAQ

What is the maximum junction temperature rating for the SFA801G?

The SFA801G has a maximum junction temperature (T_JMAX) of +150°C, verified per absolute maximum ratings table. This allows reliable operation in high-ambient environments such as enclosed industrial enclosures or under-hood automotive locations when paired with appropriate heatsinking. The SFA801G maintains full parameter specification up to this limit, and derating curves confirm 8 A I_F capability at case temperatures up to 100°C.

Is the SFA801G pin-compatible with other TO-220AC rectifiers like MUR850E?

Yes, the SFA801G uses the standard TO-220AC outline with anode (lead 1), cathode (lead 2), and electrically connected tab (cathode). Its pinout matches MUR850E, STTH8R06D, and other industry-standard TO-220AC rectifiers, enabling direct PCB layout reuse. However, thermal pad isolation requirements and mounting torque (0.56 N·m max) must be verified per board stack-up and heatsink interface.

Does the SFA801G have AEC-Q101 qualification?

The base SFA801G is not AEC-Q101 qualified, but the SFA801GH variant-identical in all electrical and mechanical specifications except qualification status-is fully AEC-Q101 tested and certified. The "H" suffix denotes automotive qualification, and both parts share the same TO-220AC package, marking code format, and thermal performance.

What is the reverse recovery time (t_rr) test condition for the SFA801G?

The SFA801G reverse recovery time is specified as 35 ns under the exact test condition: forward current I_F = 0.5 A, reverse current I_R = 1.0 A, reverse recovery current I_rr = 0.25 A, per JEDEC standards. This value is typical and applies across the full operating temperature range, supporting consistent timing predictability in high-frequency synchronous rectifier control loops.

How does the SFA801G's forward voltage compare to similar 50 V rectifiers?

The SFA801G exhibits a typical forward voltage of 0.975 V at 8 A and 25°C-comparable to ON Semiconductor's MUR850E (0.92 V) and slightly higher than Vishay's VS-8EWH05FN-M3 (0.89 V), but with superior surge rating (125 A I_FSM) and lower junction capacitance (100 pF). Its V_F remains stable across temperature, delivering predictable conduction loss in thermally cycling applications.

SFA801G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: TO-220-2

Packaging:: Tube

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 50 V

Current - Average Rectified (Io):: 8A

Voltage - Forward (Vf) (Max) @ If:: 975 mV @ 8 A

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

Reverse Recovery Time (trr):: 35 ns

Current - Reverse Leakage @ Vr:: 10 µA @ 50 V

Capacitance @ Vr, F:: 100pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220AC

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

SFA801G FAQ

1.How can I place an order for SFA801G through Aetrix?

Please submit a Request for Quotation (RFQ) for SFA801G 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 SFA801G reliable?

The price and inventory of SFA801G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SFA801G is usually 5 days.

3.What payment methods are accepted for SFA801G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SFA801G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SFA801G?

SFA801G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SFA801G 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 SFA801G?

For technical support, including SFA801G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SFA801G requirements.

6.How does Aetrix verify that SFA801G is sourced from the original manufacturer or authorized distributors?

All SFA801G 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 SFA801G meets industry standards.

7.What is the process for return or replacement of SFA801G?

All SFA801G units undergo pre-shipment inspection (PSI). If there is an issue with SFA801G, 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 SFA801G part is unused and in its original packaging.

Return procedure for SFA801G:

1.Submit a request within 90 days.

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

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