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

Taiwan Semiconductor Corporation SF34G-A

Name: SF34G-A
Brand: Taiwan Semiconductor Corporation
SKU: SF34G-A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SF34G-A

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: SF34G-A.pdf

Description:: 35NS, 3A, 200V, SUPER FAST RECOV

Quantity:: RFQ Add To RFQ list

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Inventory:6,771

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Product details

Overview

SF34G-A from Taiwan Semiconductor is a 3A, 200V super fast recovery rectifier diode in DO-201AD package, featuring 35ns reverse recovery time, 0.95V forward voltage at 3A/25°C, and 125A surge capability - used in high-frequency switching power supplies for freewheeling and output rectification.

For engineers reviewing the SF34G-A datasheet, SF34G-A pinout, SF34G-A application, or SF34G-A equivalent, key selection criteria include V_RRM = 200V, trr = 35ns, VF = 0.95V @ 3A, thermal resistance R_θJL = 10°C/W, and DO-201AD mechanical compatibility with automated SMT placement.

Technical Context

This single-die silicon rectifier operates with ultra-fast recovery (trr ≤ 35ns) to minimize switching losses in SMPS operating above 50kHz. Its low VF (0.95V) and high IFSM (125A) support high-efficiency, high-reliability DC–DC conversion under transient load conditions.

The device uses planar junction construction with pure tin-plated leads compliant with J-STD-002, rated for TJ = –55°C to +150°C, and packaged in UL 94V-0 molding compound - enabling use in industrial-grade power converters requiring robust thermal and mechanical performance.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	200 V - maximum repetitive reverse voltage; defines safe blocking capability in 200V-rated output stages
I_F	3 A - continuous average forward current; supports sustained conduction in 3A-output SMPS designs
I_FSM	125 A - non-repetitive surge rating; handles inrush and fault currents without failure
t_rr	35 ns - reverse recovery time; enables efficient operation in >100kHz switching topologies
V_F	0.95 V @ 3A, 25°C - forward voltage drop; directly determines conduction loss and thermal rise
R_θJL	10 °C/W - junction-to-lead thermal resistance; enables direct heatsinking via PCB copper pour or lead frame
C_J	80 pF @ 1MHz, 4V - junction capacitance; impacts high-frequency noise and EMI filter design

Pinout & Package

DO-201AD axial-leaded package with cathode band marking; body length 7.62 mm, diameter 3.6 mm, lead spacing 5.08 mm, weight ≈1.10 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in flyback secondary or buck output)
Cathode	Forward current exit / reverse blocking terminal	Marked by band; ties to positive rail or output capacitor; withstands 200V reverse bias

Key Features

Feature	Design Value
Super fast recovery (trr ≤ 35 ns)	Reduces switching losses and EMI in high-frequency converters (>100 kHz)
Low forward voltage (VF = 0.95 V @ 3A)	Lowers conduction loss by ~15% vs. standard FRDs with VF ≥ 1.1 V at same current
High surge rating (IFSM = 125 A)	Survives cold-start surges and short-circuit transients without bond-wire fusing
RoHS & halogen-free compliance	Meets IEC 61249-2-21; supports environmentally regulated industrial and telecom end equipment

Applications

DC–DC Converter Output Rectification	Switch-Mode Power Supply Freewheeling
Use Scenario: Secondary-side rectification in isolated 24V/3A flyback or forward converter powering industrial PLC I/O modules. IC Role / Device Role / Timing Role: Unidirectional current path with minimal conduction loss and fast turn-off to prevent cross-conduction in synchronous designs. Use Value: 0.95V VF reduces output-stage power loss by 0.45W vs. 1.1V alternatives, lowering thermal stress on PCB layout.	Use Scenario: Freewheeling path across MOSFET drain in non-isolated buck regulator supplying FPGA core voltage. IC Role / Device Role / Timing Role: Provides low-loss return path during high-side switch off-time; 35ns trr prevents shoot-through in 500kHz operation. Use Value: Enables stable regulation at 500kHz switching frequency where slower diodes would cause excessive ringing and efficiency drop.
Inverter DC Bus Clamping	AC–DC Adapter Output Stage
Use Scenario: Snubberless clamping diode across IGBT collector-emitter in 1kW solar microinverter H-bridge stage. IC Role / Device Role / Timing Role: Absorbs inductive energy during IGBT turn-off; 200V V_RRM matches 175V DC bus with 20% margin. Use Value: Eliminates need for external RC snubber, reducing BOM count and board area while maintaining <1% efficiency penalty.	Use Scenario: Output rectifier in 12V/3A wall adapter for network routers with universal AC input. IC Role / Device Role / Timing Role: Converts transformer secondary AC to regulated DC; DO-201AD package allows manual or auto-insertion into compact chassis-mount design. Use Value: 1.10g mass and UL 94V-0 compound meet safety agency requirements for Class II insulated consumer adapters.

DC–DC Converter Output Rectification

Switch-Mode Power Supply Freewheeling

Use Scenario: Secondary-side rectification in isolated 24V/3A flyback or forward converter powering industrial PLC I/O modules.

IC Role / Device Role / Timing Role: Unidirectional current path with minimal conduction loss and fast turn-off to prevent cross-conduction in synchronous designs.

Use Value: 0.95V VF reduces output-stage power loss by 0.45W vs. 1.1V alternatives, lowering thermal stress on PCB layout.

Use Scenario: Freewheeling path across MOSFET drain in non-isolated buck regulator supplying FPGA core voltage.

IC Role / Device Role / Timing Role: Provides low-loss return path during high-side switch off-time; 35ns trr prevents shoot-through in 500kHz operation.

Use Value: Enables stable regulation at 500kHz switching frequency where slower diodes would cause excessive ringing and efficiency drop.

Inverter DC Bus Clamping

AC–DC Adapter Output Stage

Use Scenario: Snubberless clamping diode across IGBT collector-emitter in 1kW solar microinverter H-bridge stage.

IC Role / Device Role / Timing Role: Absorbs inductive energy during IGBT turn-off; 200V V_RRM matches 175V DC bus with 20% margin.

Use Value: Eliminates need for external RC snubber, reducing BOM count and board area while maintaining <1% efficiency penalty.

Use Scenario: Output rectifier in 12V/3A wall adapter for network routers with universal AC input.

IC Role / Device Role / Timing Role: Converts transformer secondary AC to regulated DC; DO-201AD package allows manual or auto-insertion into compact chassis-mount design.

Use Value: 1.10g mass and UL 94V-0 compound meet safety agency requirements for Class II insulated consumer adapters.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L06S	V_RRM = 600V, trr = 30ns, VF = 0.97V @ 3A, TO-220AC package	Higher voltage rating and larger thermal mass; requires heatsink mounting	Preferred when system requires >200V blocking or higher thermal dissipation; not drop-in due to TO-220 footprint
ES3D	V_RRM = 200V, trr = 35ns, VF = 0.92V @ 3A, DO-204AL (SMA) package	Same V_RRM and trr, slightly lower VF, but smaller 2.5mm × 4.5mm SMA case limits power handling	Valid for space-constrained designs with <2.5W dissipation; requires re-evaluation of thermal derating curves

Compared with STTH3L06S and ES3D, the SF34G-A offers optimal balance of 200V rating, 35ns speed, and DO-201AD manufacturability - making it ideal for cost-sensitive, medium-power industrial SMPS where leaded axial assembly and proven reliability are prioritized over surface-mount miniaturization or ultra-high-voltage operation.

Availability

SF34G-A is available at Aetrix Electronics and suitable for DC–DC converters, switching mode power supplies, and freewheeling applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for SF34G-A 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 SF3xG-A series was designed specifically for high-efficiency, high-reliability AC–DC and DC–DC power conversion - emphasizing fast recovery, low VF, and rugged packaging for demanding industrial environments.

FAQ

What is the maximum junction temperature rating for SF34G-A?

The SF34G-A has a maximum junction temperature (T_J) rating of +150°C, with operational range from –55°C to +150°C. This allows reliable operation in enclosed industrial enclosures or high-ambient-temperature environments. Thermal design must ensure that actual junction temperature stays below this limit under worst-case load and ambient conditions - verified using R_θJL = 10°C/W and measured lead temperature.

Does SF34G-A have a specified reverse recovery time (trr)?

Yes, the SF34G-A has a maximum reverse recovery time (t_rr) of 35 ns, tested under IF = 0.5A, IR = 1.0A, and Irr = 0.25A. This value is confirmed in the Electrical Specifications table of the official TSC datasheet (Version B2105) and enables stable operation in switching power supplies up to 500kHz without significant efficiency degradation.

What is the forward voltage (VF) of SF34G-A at rated current?

The SF34G-A exhibits a typical forward voltage (V_F) of 0.95 V at I_F = 3 A and T_J = 25°C, per the Electrical Specifications table. This value is measured under pulse conditions (PW = 0.3 ms), and actual VF increases with junction temperature - reaching approximately 1.05 V at 125°C junction temperature.

Is SF34G-A RoHS and halogen-free compliant?

Yes, SF34G-A is RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound meets UL 94V-0 flammability rating, and the pure tin-plated leads satisfy J-STD-002 solderability requirements. These certifications are explicitly stated in the FEATURES section of the TSC SF31G-A–SF38G-A datasheet (Version B2105).

What package type does SF34G-A use, and what are its key mechanical features?

SF34G-A uses the DO-201AD axial-leaded package with cathode band polarity marking. Key mechanical features include UL 94V-0 flammability rating, pure tin-plated leads qualified per J-STD-002, JESD 201 Class 1A whisker resistance, and approximate weight of 1.10 g. Dimensions are standardized per JEDEC DO-201AD outline: body length 7.62 mm, diameter 3.6 mm, lead spacing 5.08 mm.

SF34G-A Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-201AD, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

Voltage - DC Reverse (Vr) (Max):: 200 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 950 mV @ 3 A

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

Reverse Recovery Time (trr):: 35 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 200 V

Capacitance @ Vr, F:: 80pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

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

SF34G-A FAQ

1.How can I place an order for SF34G-A through Aetrix?

Please submit a Request for Quotation (RFQ) for SF34G-A 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 SF34G-A reliable?

The price and inventory of SF34G-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF34G-A is usually 5 days.

3.What payment methods are accepted for SF34G-A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF34G-A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF34G-A?

SF34G-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF34G-A 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 SF34G-A?

For technical support, including SF34G-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF34G-A requirements.

6.How does Aetrix verify that SF34G-A is sourced from the original manufacturer or authorized distributors?

All SF34G-A 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 SF34G-A meets industry standards.

7.What is the process for return or replacement of SF34G-A?

All SF34G-A units undergo pre-shipment inspection (PSI). If there is an issue with SF34G-A, 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 SF34G-A part is unused and in its original packaging.

Return procedure for SF34G-A:

1.Submit a request within 90 days.

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

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