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

Taiwan Semiconductor Corporation SFT11G A1G

Name: SFT11G A1G
Brand: Taiwan Semiconductor Corporation
SKU: SFT11G A1G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SFT11G A1G

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: T-18, Axial

Datasheet:: SFT11G A1G.pdf

Description:: DIODE GEN PURP 50V 1A TS-1

Quantity:: RFQ Add To RFQ list

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Inventory:3,446

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Product details

Overview

SFT11G A1G from Taiwan Semiconductor is a 1 A, 50 V super fast recovery rectifier diode in TS-1 package, featuring 35 ns reverse recovery time, 0.95 V forward voltage at 1 A/25°C, and 30 A surge current capability; used in DC-DC converters and freewheeling paths in automotive-grade power supplies.

For engineers reviewing the SFT11G A1G datasheet, SFT11G A1G pinout, SFT11G A1G application, or SFT11G A1G equivalent, key selection criteria include V_RRM = 50 V, I_F = 1 A, t_rr = 35 ns, R_θJA = 100 °C/W, and AEC-Q101 qualification status - critical for high-reliability 12 V automotive subsystems.

Technical Context

The SFT11G A1G is a single-die, planar junction super fast rectifier optimized for low conduction loss and rapid switching. Its 35 ns reverse recovery time enables operation in high-frequency switching topologies up to 100 kHz, while its 0.95 V forward voltage minimizes power dissipation at rated 1 A DC current.

Designed with pure tin-plated leads compliant with J-STD-002 and JESD201 Class 2 whisker resistance, the device supports lead-free reflow soldering. The TS-1 package provides UL 94V-0 mold compound and cathode band polarity marking for unambiguous board-level orientation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	50 V - Maximum repetitive reverse blocking voltage; defines safe operating range in 12 V automotive bus clamping and flyback snubbing.
I_F	1 A continuous - Rated average forward current; supports compact thermal design in space-constrained DC-DC modules.
t_rr	35 ns - Measured at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A; enables efficient operation in 50–100 kHz SMPS without excessive switching loss.
V_F	0.95 V @ 1 A, 25°C - Low forward drop reduces conduction loss to ≤0.95 W at full load, improving efficiency in low-voltage output stages.
I_FSM	30 A - Non-repetitive surge rating (8.3 ms half-sine); withstands inrush and fault currents in automotive load-dump scenarios.
R_θJA	100 °C/W - Junction-to-ambient thermal resistance; requires ≥100 mm² copper pour for T_J ≤125°C at 1 A in still air.

Pinout & Package

TS-1 package: molded epoxy case with axial leads, cathode indicated by band, 0.200 g mass, UL 94V-0 rated compound, pure tin-plated terminals.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry	Connected to lower-potential node (e.g., switch node in buck freewheel path); accepts 1 A DC and 30 A surge.
Cathode	Forward current exit / reverse blocking terminal	Marked with band; connects to higher-potential rail (e.g., output capacitor positive); blocks 50 V reverse during off-state.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive temperature cycling, humidity bias, and mechanical shock per stress test standard - enables use in engine control and body electronics.
Super fast recovery (t_rr = 35 ns)	Reduces reverse recovery charge Q_rr, minimizing switching losses and EMI in high-frequency converters above 50 kHz.
Low V_F (0.95 V @ 1 A)	Delivers >92% conduction efficiency at 5 V output, reducing heatsink requirements in space-limited modules.
RoHS + halogen-free	Complies with IEC 61249-2-21 and EU RoHS Directive - meets environmental compliance for global automotive OEM supply chains.

Applications

Automotive DC-DC Converters	Industrial SMPS Freewheeling
Use Scenario: Step-down conversion from 12 V battery to 5 V/3.3 V for infotainment and ADAS ECUs. IC Role / Device Role / Timing Role: Freewheeling diode in synchronous buck converter secondary path, conducting during low-side MOSFET off-time. Use Value: 35 ns t_rr prevents cross-conduction loss with synchronous FET; 0.95 V V_F limits conduction loss to <1 W at full load.	Use Scenario: Output rectification in 24 V input industrial AC-DC power supplies with 12 V auxiliary rail. IC Role / Device Role / Timing Role: Unidirectional current path enabling energy transfer from transformer secondary to output capacitor during flyback phase. Use Value: 30 A I_FSM handles startup surges; TS-1 package allows manual or automated placement on dense PCBs.
LED Driver Flyback Snubbing	Power Tool Battery Protection
Use Scenario: Snubber diode across primary-side MOSFET in isolated LED driver for street lighting. IC Role / Device Role / Timing Role: Clamp transient voltage spikes during MOSFET turn-off using fast reverse recovery to absorb leakage inductance energy. Use Value: 50 V V_RRM matches typical 12–24 V input designs; 35 ns t_rr ensures clean clamping without oscillation.	Use Scenario: Reverse polarity protection and back-EMF suppression in cordless power tool motor drivers. IC Role / Device Role / Timing Role: Series-connected blocking diode preventing battery damage during accidental reverse connection or motor regeneration. Use Value: AEC-Q101 qualification ensures reliability under vibration and thermal cycling; 100 °C/W R_θJA supports operation up to 85°C ambient.

Automotive DC-DC Converters

Industrial SMPS Freewheeling

Use Scenario: Step-down conversion from 12 V battery to 5 V/3.3 V for infotainment and ADAS ECUs.

IC Role / Device Role / Timing Role: Freewheeling diode in synchronous buck converter secondary path, conducting during low-side MOSFET off-time.

Use Value: 35 ns t_rr prevents cross-conduction loss with synchronous FET; 0.95 V V_F limits conduction loss to <1 W at full load.

Use Scenario: Output rectification in 24 V input industrial AC-DC power supplies with 12 V auxiliary rail.

IC Role / Device Role / Timing Role: Unidirectional current path enabling energy transfer from transformer secondary to output capacitor during flyback phase.

Use Value: 30 A I_FSM handles startup surges; TS-1 package allows manual or automated placement on dense PCBs.

LED Driver Flyback Snubbing

Power Tool Battery Protection

Use Scenario: Snubber diode across primary-side MOSFET in isolated LED driver for street lighting.

IC Role / Device Role / Timing Role: Clamp transient voltage spikes during MOSFET turn-off using fast reverse recovery to absorb leakage inductance energy.

Use Value: 50 V V_RRM matches typical 12–24 V input designs; 35 ns t_rr ensures clean clamping without oscillation.

Use Scenario: Reverse polarity protection and back-EMF suppression in cordless power tool motor drivers.

IC Role / Device Role / Timing Role: Series-connected blocking diode preventing battery damage during accidental reverse connection or motor regeneration.

Use Value: AEC-Q101 qualification ensures reliability under vibration and thermal cycling; 100 °C/W R_θJA supports operation up to 85°C ambient.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R06U	V_RRM = 600 V, t_rr = 30 ns, V_F = 1.05 V @ 1 A - higher voltage rating, slightly faster recovery.	Targeted at universal-input SMPS; over-specified for 12 V systems where lower V_RRM improves softness and cost.	Select when designing for 24–400 V input ranges or requiring margin against transients exceeding 50 V.
ON Semi MUR105	V_RRM = 50 V, t_rr = 50 ns, V_F = 0.92 V @ 1 A - same voltage rating but slower recovery, marginally lower V_F.	Used in legacy consumer power adapters; lacks AEC-Q101 qualification and halogen-free compliance.	Acceptable for non-automotive cost-sensitive designs where 15 ns slower recovery does not impact efficiency or EMI.

Compared with STTH1R06U and MUR105, the SFT11G A1G delivers optimal balance of 50 V rating, 35 ns speed, AEC-Q101 qualification, and halogen-free construction - making it the preferred choice for new automotive and industrial 12 V power designs requiring validated reliability and regulatory compliance.

Availability

SFT11G A1G is available at Aetrix Electronics and suitable for automotive DC-DC converters, industrial SMPS freewheeling paths, and LED driver flyback snubbing requiring stable component supply and long-term lifecycle support.

Supply support for SFT11G A1G 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 automotive, industrial, and consumer markets since 1979.

The SFT11G A1G belongs to TSC's AEC-Q101-qualified super fast rectifier family, engineered specifically for high-efficiency, high-reliability power conversion in automotive subsystems and ruggedized industrial equipment.

FAQ

What is the peak repetitive reverse voltage rating for SFT11G A1G?

The SFT11G A1G has a peak repetitive reverse voltage (V_RRM) rating of 50 V. This value is confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version J2104), and defines the maximum reverse-biased voltage the device can block continuously without breakdown under normal operating conditions.

Is SFT11G A1G qualified to AEC-Q101 standards?

Yes, the "A1G" suffix in SFT11G A1G explicitly denotes AEC-Q101 qualification. Per Taiwan Semiconductor's ordering information note, the "H" or "A1G" suffix indicates AEC-Q101-compliant manufacturing and testing - including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing.

What is the forward voltage of SFT11G A1G at 1 A and 25°C?

The forward voltage (V_F) of the SFT11G A1G is 0.95 V at I_F = 1 A and T_J = 25°C, as specified in the Electrical Specifications table (Version J2104). This value is measured under pulsed conditions (PW = 0.3 ms) and represents typical conduction loss at rated DC current.

What package type does SFT11G A1G use, and what are its key mechanical features?

SFT11G A1G uses the TS-1 package: an axial-leaded, molded epoxy case with UL 94V-0 flammability rating, pure tin-plated leads compliant with J-STD-002, and cathode polarity marked by a visible band. Its mass is approximately 0.200 g, and it passes JESD201 Class 2 whisker testing.

What is the reverse recovery time (t_rr) specification for SFT11G A1G?

The reverse recovery time (t_rr) of the SFT11G A1G is 35 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A, per the Electrical Specifications table in the Taiwan Semiconductor datasheet (Version J2104).

SFT11G A1G Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: T-18, Axial

Packaging:: Tape & Box (TB)

Product Status:: Discontinued at Digi-Key

Technology:: Standard

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

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 950 mV @ 1 A

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

Reverse Recovery Time (trr):: 35 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 50 V

Capacitance @ Vr, F:: 20pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TS-1

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

SFT11G A1G FAQ

1.How can I place an order for SFT11G A1G through Aetrix?

Please submit a Request for Quotation (RFQ) for SFT11G A1G 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 SFT11G A1G reliable?

The price and inventory of SFT11G A1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SFT11G A1G is usually 5 days.

3.What payment methods are accepted for SFT11G A1G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SFT11G A1G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SFT11G A1G?

SFT11G A1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SFT11G A1G 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 SFT11G A1G?

For technical support, including SFT11G A1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SFT11G A1G requirements.

6.How does Aetrix verify that SFT11G A1G is sourced from the original manufacturer or authorized distributors?

All SFT11G A1G 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 SFT11G A1G meets industry standards.

7.What is the process for return or replacement of SFT11G A1G?

All SFT11G A1G units undergo pre-shipment inspection (PSI). If there is an issue with SFT11G A1G, 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 SFT11G A1G part is unused and in its original packaging.

Return procedure for SFT11G A1G:

1.Submit a request within 90 days.

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

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