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

Taiwan Semiconductor Corporation SF35G-A

Name: SF35G-A
Brand: Taiwan Semiconductor Corporation
SKU: SF35G-A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SF35G-A

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-201AD, Axial

Datasheet:: SF35G-A.pdf

Description:: 35NS, 3A, 300V, SUPER FAST RECOV

Quantity:: RFQ Add To RFQ list

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Inventory:2,356

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Product details

Overview

SF35G-A from Taiwan Semiconductor is a 3A, 300V super fast rectifier diode in DO-201AD package, featuring 35ns reverse recovery time, 1.30V forward voltage at 3A/25°C, and 125A surge capability. It serves as a primary output rectifier in high-frequency DC-DC converters requiring low conduction loss and fast switching.

For engineers reviewing the SF35G-A datasheet, SF35G-A pinout, SF35G-A application, or SF35G-A equivalent, key selection criteria include V_RRM = 300V, I_F = 3A, t_rr = 35ns, thermal resistance R_θJL = 10°C/W, and DO-201AD mechanical compatibility with automated SMT placement.

Technical Context

The SF35G-A employs a single-die silicon PN junction optimized for super-fast recovery (t_rr ≤ 35ns), enabling efficient operation in 100–500 kHz switching power supplies. Its 300V V_RRM rating supports 210V RMS input stages in offline SMPS designs.

Thermal performance is defined by R_θJL = 10°C/W and R_θJA = 35°C/W, with maximum junction temperature of +150°C. The device uses pure tin-plated leads compliant with J-STD-002 and passes JESD201 Class 1A whisker testing.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	300 V - Withstands peak reverse voltage up to 300V in bridge or freewheeling configurations
I_F	3 A - Continuous average forward current rating at T_L = 75°C on FR-4 PCB
t_rr	35 ns - Enables high-frequency operation with minimal switching loss in 100–500 kHz converters
V_F	1.30 V @ 3A, 25°C - Low conduction loss reduces thermal stress in compact power stages
I_FSM	125 A - Handles 8.3ms half-sine surge without failure during startup or overload transients
R_θJL	10 °C/W - Efficient heat transfer from junction to lead supports high-power density layouts
C_J	60 pF @ 1MHz, 4V - Low junction capacitance minimizes capacitive switching losses and EMI generation

Pinout & Package

DO-201AD axial-leaded package with cathode band marking; body length 9.5mm, diameter 3.6mm, lead spacing 5.3mm; RoHS-compliant, halogen-free molding compound (UL 94V-0).

Pin/Terminal	Circuit Role	Design Meaning
Anode (lead without band)	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck converter)
Cathode (lead with band)	Forward current exit point	Connected to output rail or filter capacitor positive terminal

Key Features

Feature	Design Value
Super-fast recovery	t_rr = 35 ns enables >300 kHz operation with reduced switching loss vs. standard rectifiers
Low forward voltage	V_F = 1.30 V @ 3A improves efficiency in 12–48V output stages
High surge robustness	I_FSM = 125 A withstands repetitive line surges and inrush currents
Thermal reliability	R_θJL = 10°C/W allows direct heatsinking via PCB copper pour or lead frame
Lead finish compliance	Pure tin plating meets J-STD-002 solderability and JESD201 Class 1A whisker resistance

Applications

AC-DC Adapter Output Rectification	DC-DC Buck Converter Freewheeling Diode
Use Scenario: Secondary-side rectification in 24–48V, 60W AC-DC adapters operating at 200 kHz. IC Role / Device Role / Timing Role: Primary output rectifier converting transformer secondary AC to regulated DC. Use Value: 35ns t_rr and 1.30V V_F reduce conduction and switching losses, improving full-load efficiency by ≥0.8% over standard fast rectifiers.	Use Scenario: Freewheeling path in 12V→5V synchronous buck converter with 300 kHz switching frequency. IC Role / Device Role / Timing Role: Provides low-loss current path during high-side MOSFET off-time. Use Value: 125A I_FSM handles transient load steps without degradation; DO-201AD footprint ensures mechanical stability under thermal cycling.
Industrial UPS Inverter Stage	LED Driver Flyback Secondary Rectifier
Use Scenario: DC bus rectification in 48V-input online UPS inverters with bidirectional energy flow. IC Role / Device Role / Timing Role: Unidirectional conduction element in H-bridge output stage. Use Value: 300V V_RRM provides 2× safety margin over 170V DC bus; 150°C T_JMAX supports operation in sealed enclosures.	Use Scenario: Output rectification in isolated 36V, 1.5A LED drivers using flyback topology. IC Role / Device Role / Timing Role: Converts transformer secondary AC to constant-current LED string supply. Use Value: 60pF C_J limits high-frequency ringing and EMI emissions; RoHS/halogen-free construction meets lighting industry environmental requirements.

AC-DC Adapter Output Rectification

DC-DC Buck Converter Freewheeling Diode

Use Scenario: Secondary-side rectification in 24–48V, 60W AC-DC adapters operating at 200 kHz.

IC Role / Device Role / Timing Role: Primary output rectifier converting transformer secondary AC to regulated DC.

Use Value: 35ns t_rr and 1.30V V_F reduce conduction and switching losses, improving full-load efficiency by ≥0.8% over standard fast rectifiers.

Use Scenario: Freewheeling path in 12V→5V synchronous buck converter with 300 kHz switching frequency.

IC Role / Device Role / Timing Role: Provides low-loss current path during high-side MOSFET off-time.

Use Value: 125A I_FSM handles transient load steps without degradation; DO-201AD footprint ensures mechanical stability under thermal cycling.

Industrial UPS Inverter Stage

LED Driver Flyback Secondary Rectifier

Use Scenario: DC bus rectification in 48V-input online UPS inverters with bidirectional energy flow.

IC Role / Device Role / Timing Role: Unidirectional conduction element in H-bridge output stage.

Use Value: 300V V_RRM provides 2× safety margin over 170V DC bus; 150°C T_JMAX supports operation in sealed enclosures.

Use Scenario: Output rectification in isolated 36V, 1.5A LED drivers using flyback topology.

IC Role / Device Role / Timing Role: Converts transformer secondary AC to constant-current LED string supply.

Use Value: 60pF C_J limits high-frequency ringing and EMI emissions; RoHS/halogen-free construction meets lighting industry environmental requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH3L03S	V_RRM = 300V, t_rr = 30ns, V_F = 1.25V @ 3A - slightly faster and lower VF	Same DO-201AD package but tighter t_rr tolerance; better suited for >400 kHz designs	Prefer when minimizing switching loss is critical and layout allows tighter timing margins
ES3D	V_RRM = 200V, t_rr = 35ns, V_F = 0.95V @ 3A - lower voltage rating, lower VF	Not suitable for 300V systems; ideal for 12–24V secondary-side rectification where lower VF dominates	Select only if system V_RRM requirement is ≤200V and lowest conduction loss is priority

Compared with STTH3L03S and ES3D, the SF35G-A delivers balanced performance at 300V rating with proven thermal robustness (R_θJL = 10°C/W) and industrial-grade reliability (JESD201 Class 1A), making it optimal for cost-sensitive 300V-rated power supplies requiring long-term field stability.

Availability

SF35G-A is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and freewheeling applications requiring stable component supply, consistent parametric performance across production lots, and long-term industrial lifecycle support.

Supply support for SF35G-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 Taiwanese manufacturer specializing in discrete power semiconductors, including rectifiers, TVS diodes, and MOSFETs, with ISO/TS 16949 and ISO 14001 certification.

The SF3xG-A series was designed specifically for high-efficiency, high-reliability switching power supplies in industrial, telecom, and consumer power applications, emphasizing fast recovery, thermal robustness, and halogen-free compliance.

FAQ

What is the peak repetitive reverse voltage rating for SF35G-A?

The SF35G-A has a peak repetitive reverse voltage (V_RRM) rating of 300 V, verified per Taiwan Semiconductor's B2105 datasheet revision. This value defines the maximum allowable reverse-biased voltage the device can block continuously without breakdown. Designers must ensure circuit peak reverse voltage remains below 300 V with appropriate derating margin. The SF35G-A is part of the SF31G-A–SF38G-A family, where the digit "35" directly indicates its 300 V rating.

What is the forward voltage drop of SF35G-A at rated current?

The SF35G-A exhibits a typical forward voltage (V_F) of 1.30 V at 3 A and 25°C junction temperature, as specified in the Electrical Specifications table. This value increases with temperature and current - at 125°C, V_F rises to approximately 1.15 V due to negative temperature coefficient. The measurement uses a 0.3 ms pulse width to avoid self-heating effects, ensuring accurate characterization of intrinsic diode behavior.

Does SF35G-A have a specified reverse recovery time?

Yes, the SF35G-A has a maximum reverse recovery time (t_rr) of 35 ns, measured under conditions of I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This parameter confirms its classification as a super fast rectifier and is critical for minimizing switching losses in high-frequency converters. The t_rr value is consistent across SF35G-A through SF38G-A variants, distinguishing them from slower general-purpose rectifiers.

What package type does SF35G-A use, and what are its key mechanical features?

SF35G-A uses the DO-201AD axial-leaded package, with dimensions of 9.5 mm body length and 3.6 mm diameter. Key mechanical features include a UL 94V-0 rated molding compound, pure tin-plated leads compliant with J-STD-002 solderability standards, and JESD201 Class 1A whisker resistance. Polarity is marked by a visible cathode band, and approximate weight is 1.10 g.

Is SF35G-A RoHS and halogen-free compliant?

Yes, SF35G-A is RoHS compliant and halogen-free in accordance with IEC 61249-2-21. This compliance is explicitly stated in the FEATURES section of the official datasheet and confirmed by Taiwan Semiconductor's material declarations. The halogen-free status applies to the epoxy molding compound, and RoHS compliance covers all six restricted substances including lead, cadmium, mercury, hexavalent chromium, PBB, and PBDE.

SF35G-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):: 300 V

Current - Average Rectified (Io):: 3A

Voltage - Forward (Vf) (Max) @ If:: 1.3 V @ 3 A

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

Reverse Recovery Time (trr):: 35 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 300 V

Capacitance @ Vr, F:: 60pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-201AD

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

SF35G-A FAQ

1.How can I place an order for SF35G-A through Aetrix?

Please submit a Request for Quotation (RFQ) for SF35G-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 SF35G-A reliable?

The price and inventory of SF35G-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF35G-A is usually 5 days.

3.What payment methods are accepted for SF35G-A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF35G-A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF35G-A?

SF35G-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF35G-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 SF35G-A?

For technical support, including SF35G-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF35G-A requirements.

6.How does Aetrix verify that SF35G-A is sourced from the original manufacturer or authorized distributors?

All SF35G-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 SF35G-A meets industry standards.

7.What is the process for return or replacement of SF35G-A?

All SF35G-A units undergo pre-shipment inspection (PSI). If there is an issue with SF35G-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 SF35G-A part is unused and in its original packaging.

Return procedure for SF35G-A:

1.Submit a request within 90 days.

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

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