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

Taiwan Semiconductor Corporation SFAS803G

Name: SFAS803G
Brand: Taiwan Semiconductor Corporation
SKU: SFAS803G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SFAS803G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: SFAS803G.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:9,533

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Product details

Overview

SFAS803G from Taiwan Semiconductor is an 8A, 150V repetitive peak reverse voltage super fast surface-mount rectifier in TO-263AB (D2PAK) package, featuring 35ns reverse recovery time, 0.95V forward voltage at 8A/25°C, and 2.2°C/W junction-to-case thermal resistance-used in DC-DC converters and switching-mode inverters.

For engineers reviewing the SFAS803G datasheet, SFAS803G pinout, SFAS803G application, or SFAS803G equivalent, key selection criteria include V_RRM=150V, I_F=8A, t_rr=35ns, R_θJC=2.2°C/W, and TO-263AB mechanical compatibility for high-efficiency power conversion designs.

Technical Context

This super fast rectifier uses a glass-passivated single-die silicon junction optimized for low conduction loss and rapid carrier recombination. Its 35ns reverse recovery time and 0.95V forward voltage at rated current support high-frequency switching topologies up to several hundred kHz.

The TO-263AB (D2PAK) package provides robust thermal performance with 2.2°C/W junction-to-case resistance and matte tin-plated leads compliant with J-STD-002 solderability, enabling reliable automated placement and high surge tolerance (I_FSM=125A).

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 paths
I_F	8 A - Continuous average forward current; determines heatsink sizing and PCB copper area requirements
t_rr	35 ns - Reverse recovery time; enables efficient operation in 100–500 kHz SMPS without excessive switching loss
V_F	0.95 V @ 8A, 25°C - Forward voltage drop; directly impacts conduction loss and thermal design at full load
R_θJC	2.2 °C/W - Junction-to-case thermal resistance; allows direct calculation of case temperature rise under given power dissipation
C_J	80 pF @ 1 MHz, 4V - Junction capacitance; influences high-frequency noise coupling and snubber design

Pinout & Package

TO-263AB (D2PAK) package with three terminals: Anode (pin 1), Cathode (pin 2), and exposed thermal pad (pin 3, internally connected to cathode). The device marking "SFAS803G" appears on the top surface; polarity is indicated by cathode band.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Input current entry point during forward conduction	Connected to switching node or transformer secondary; must withstand peak reverse voltage and surge current
Cathode	Output current exit point during forward conduction	Typically tied to output rail or ground return; electrically bonded to thermal pad for heat transfer
Thermal Pad (exposed)	Primary thermal path to PCB	Requires minimum 100 mm² copper pour with ≥4 thermal vias for effective junction cooling

Key Features

Feature	Design Value
Glass-passivated junction	Enables stable long-term reliability under humidity and thermal cycling per J-STD-020 Level 1 moisture sensitivity
Super fast recovery (35 ns)	Reduces switching loss in high-frequency converters compared to standard fast rectifiers (>100 ns)
Low V_F (0.95 V)	Lowers conduction loss by ~15% versus comparable 150V rectifiers with V_F ≥ 1.1 V at 8A
High I_FSM (125 A)	Withstands transient surges in PFC and motor drive applications without degradation
Halogen-free & RoHS-compliant	Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally regulated end equipment

Applications

DC-DC Converter	Switching Inverter
Use Scenario: Secondary-side rectification in isolated 48V-to-12V synchronous buck-derived converters. IC Role / Device Role / Timing Role: Freewheeling rectifier conducting during low-side switch off-time; handles continuous 8A output current. Use Value: 0.95V V_F minimizes conduction loss; 35ns t_rr prevents reverse recovery shoot-through in 300 kHz designs.	Use Scenario: Output stage rectification in 1–3 kW solar microinverters with transformerless topology. IC Role / Device Role / Timing Role: Unidirectional current path in H-bridge output filter; blocks 150V reverse voltage during PWM dead time. Use Value: 125A I_FSM withstands grid-synchronization surges; TO-263AB thermal pad ensures <100°C junction temp at full load.
Freewheeling Diode	SMPS Secondary Rectifier
Use Scenario: Inductive load freewheeling in industrial PLC output modules driving solenoids and relays. IC Role / Device Role / Timing Role: Provides low-impedance return path when MOSFET switches off; clamps inductive kickback. Use Value: 150V V_RRM safely absorbs 120VAC-derived transients; glass passivation ensures >10-year field reliability.	Use Scenario: Output rectification in 24V/10A telecom power supplies using active clamp forward topology. IC Role / Device Role / Timing Role: Conducts during transformer reset phase; operates continuously at 8A with minimal voltage drop. Use Value: 2.2°C/W R_θJC enables compact heatsink-less design on 2 oz copper PCBs.

DC-DC Converter

Switching Inverter

Use Scenario: Secondary-side rectification in isolated 48V-to-12V synchronous buck-derived converters.

IC Role / Device Role / Timing Role: Freewheeling rectifier conducting during low-side switch off-time; handles continuous 8A output current.

Use Value: 0.95V V_F minimizes conduction loss; 35ns t_rr prevents reverse recovery shoot-through in 300 kHz designs.

Use Scenario: Output stage rectification in 1–3 kW solar microinverters with transformerless topology.

IC Role / Device Role / Timing Role: Unidirectional current path in H-bridge output filter; blocks 150V reverse voltage during PWM dead time.

Use Value: 125A I_FSM withstands grid-synchronization surges; TO-263AB thermal pad ensures <100°C junction temp at full load.

Freewheeling Diode

SMPS Secondary Rectifier

Use Scenario: Inductive load freewheeling in industrial PLC output modules driving solenoids and relays.

IC Role / Device Role / Timing Role: Provides low-impedance return path when MOSFET switches off; clamps inductive kickback.

Use Value: 150V V_RRM safely absorbs 120VAC-derived transients; glass passivation ensures >10-year field reliability.

Use Scenario: Output rectification in 24V/10A telecom power supplies using active clamp forward topology.

IC Role / Device Role / Timing Role: Conducts during transformer reset phase; operates continuously at 8A with minimal voltage drop.

Use Value: 2.2°C/W R_θJC enables compact heatsink-less design on 2 oz copper PCBs.

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 voltage rating but 79% higher forward loss	Used where system-level overvoltage margin exceeds 300V; unsuitable for 150V-rail efficiency-critical designs	Select only if reverse voltage derating requires >3× V_IN; avoid when V_F-driven thermal budget is tight
MBR8150CT	Dual common-cathode configuration, V_RRM=150V, t_rr=35ns, V_F=0.92V - same voltage/speed but dual die in TO-220AB	Preferred in dual-output or interleaved converter layouts requiring matched diodes; not surface-mount compatible	Choose for through-hole assembly or dual-path redundancy; reject for D2PAK footprint or automated SMT lines

Compared with STTH8R06D and MBR8150CT, SFAS803G delivers optimal balance of 150V blocking, 0.95V conduction loss, and TO-263AB thermal performance for space-constrained, high-efficiency SMT power stages-without over-spec'ing voltage or sacrificing mounting flexibility.

Availability

SFAS803G is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and freewheeling applications requiring stable component supply, consistent parametric performance across production lots, and long-term industrial lifecycle support.

Supply support for SFAS803G 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 consumer markets since 1979.

The SFAS803G belongs to TSC's Super Fast Rectifier product line, engineered specifically for high-frequency, high-efficiency AC/DC and DC/DC power conversion systems where low V_F, fast t_rr, and robust thermal packaging are critical.

FAQ

What is the maximum junction temperature rating for SFAS803G?

The SFAS803G has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings table in the official Taiwan Semiconductor datasheet Version N2103. This limit applies under continuous operation with proper thermal management via the TO-263AB thermal pad. Exceeding this temperature risks irreversible parametric shift or bond wire failure. Derating curves in Figure 1 confirm usable current drops to ~5.5A at 125°C case temperature.

Does SFAS803G support automated pick-and-place assembly?

Yes, SFAS803G supports automated placement per its mechanical data: it features matte tin-plated leads compliant with J-STD-002 solderability standards and moisture sensitivity level 1 (per J-STD-020), eliminating bake requirements before reflow. The TO-263AB (D2PAK) body geometry and standardized tape-and-reel packaging (800 units per reel) are validated for high-yield SMT line integration.

What is the reverse recovery time test condition for SFAS803G?

The SFAS803G reverse recovery time (t_rr) of 35 ns is measured under the condition: I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A, per the Electrical Specifications table in the Taiwan Semiconductor datasheet. This standardized test reflects real-world behavior in hard-switched converters and confirms suitability for 200–500 kHz operation without significant recovery-related losses.

How does the junction capacitance of SFAS803G affect EMI in switching circuits?

SFAS803G exhibits 80 pF junction capacitance at 1 MHz and 4.0 V reverse bias, which influences high-frequency noise generation during turn-off. In 300 kHz+ converters, this value contributes to ringing amplitude and dv/dt-induced EMI; designers mitigate it using RC snubbers or optimizing layout to minimize parasitic inductance. Lower C_J variants (e.g., SFAS805G at 60 pF) trade off higher V_F for reduced capacitive coupling.

Is SFAS803G halogen-free and RoHS-compliant?

Yes, SFAS803G is both halogen-free per IEC 61249-2-21 and RoHS-compliant per EU Directive 2011/65/EU, as explicitly stated in the Features section of the Taiwan Semiconductor datasheet Version N2103. The molding compound contains no brominated flame retardants, and lead content is below 1000 ppm, satisfying environmental compliance for global industrial and consumer shipments.

SFAS803G 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):: 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:: 80pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TO-263AB (D2PAK)

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

SFAS803G FAQ

1.How can I place an order for SFAS803G through Aetrix?

Please submit a Request for Quotation (RFQ) for SFAS803G 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 SFAS803G reliable?

The price and inventory of SFAS803G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SFAS803G is usually 5 days.

3.What payment methods are accepted for SFAS803G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SFAS803G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SFAS803G?

SFAS803G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SFAS803G 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 SFAS803G?

For technical support, including SFAS803G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SFAS803G requirements.

6.How does Aetrix verify that SFAS803G is sourced from the original manufacturer or authorized distributors?

All SFAS803G 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 SFAS803G meets industry standards.

7.What is the process for return or replacement of SFAS803G?

All SFAS803G units undergo pre-shipment inspection (PSI). If there is an issue with SFAS803G, 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 SFAS803G part is unused and in its original packaging.

Return procedure for SFAS803G:

1.Submit a request within 90 days.

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

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