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

Taiwan Semiconductor Corporation SF14G-K

Name: SF14G-K
Brand: Taiwan Semiconductor Corporation
SKU: SF14G-K
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SF14G-K

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

Package:: DO-204AL, DO-41, Axial

Datasheet:: SF14G-K.pdf

Description:: 35NS, 1A, 200V, SUPER FAST RECOV

Quantity:: RFQ Add To RFQ list

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Inventory:3,099

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Product details

Overview

SF14G-K from Taiwan Semiconductor is a 200 V, 1 A super fast recovery rectifier diode in DO-204AL (DO-41) package, with 35 ns reverse recovery time, 0.95 V forward voltage at 1 A/25°C, and 30 A surge capability - used in high-frequency switching mode power supplies for output rectification and freewheeling.

For engineers reviewing the SF14G-K datasheet, SF14G-K pinout, SF14G-K application, or SF14G-K equivalent, key selection criteria include V_RRM = 200 V, t_rr = 35 ns, V_F = 0.95 V @ 1 A, thermal resistance R_θJL = 20 °C/W, and DO-41 mechanical compatibility in compact DC-DC converters.

Technical Context

This single-die silicon rectifier uses epitaxial planar construction to achieve fast recovery (t_rr ≤ 35 ns) and low forward voltage (V_F = 0.95 V), enabling efficient operation in 50–500 kHz SMPS topologies. Its 200 V repetitive peak reverse voltage (V_RRM) and 30 A non-repetitive surge rating support robust transient handling in flyback and forward converter outputs.

The device operates across –55°C to +150°C junction temperature range, with R_θJA = 80 °C/W and R_θJL = 20 °C/W, indicating suitability for lead-mounted PCB designs without forced airflow. Cathode band polarity marking and pure tin-plated leads comply with J-STD-002 solderability and JESD201 Class 1A whisker requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	200 V - maximum repetitive reverse blocking voltage; defines safe operating limit in DC-DC output stage
I_F	1 A continuous average forward current - rated for steady-state conduction at T_A = 75°C on FR-4 PCB
t_rr	35 ns - measured at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A; enables <500 kHz switching without excessive switching loss
V_F	0.95 V @ 1 A, 25°C - low conduction loss improves efficiency in low-voltage secondary-side rectification
I_FSM	30 A - 8.3 ms half-sine surge rating; withstands inrush and fault currents in unregulated supplies
C_J	20 pF @ 1 MHz, 4 V - low junction capacitance minimizes capacitive coupling noise in high-dv/dt environments
R_θJL	20 °C/W - thermal resistance from junction to lead; supports >0.8 W dissipation with adequate copper pour

Pinout & Package

Package: DO-204AL (DO-41), axial leaded, epoxy-molded case meeting UL 94V-0; cathode indicated by band; weight ≈ 0.330 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode (unbanded end)	Forward current entry point	Connected to lower-potential node (e.g., transformer secondary center-tap or switch node)
Cathode (banded end)	Forward current exit / reverse blocking terminal	Connected to output rail; blocks reverse voltage up to 200 V during off-state

Key Features

Feature	Design Value
Super fast recovery (t_rr ≤ 35 ns)	Reduces switching losses and EMI in high-frequency converters above 200 kHz
Low forward voltage (V_F = 0.95 V)	Lowers conduction loss by ~15% vs. standard fast rectifiers at 1 A, improving thermal margin
DO-41 package with tin-plated leads	Enables automated through-hole assembly and meets J-STD-002 solderability standards
RoHS & halogen-free compliance	Fulfills IEC 61249-2-21 and environmental requirements for industrial and consumer end equipment

Applications

DC-DC Converter Output Rectification	Switch-Mode Power Supply Freewheeling
Use Scenario: Secondary-side rectification in isolated 12 V/1 A flyback converter operating at 250 kHz. IC Role / Device Role / Timing Role: Unidirectional current path converting transformer AC output to regulated DC; recovers before next switching cycle. Use Value: 35 ns t_rr prevents reverse conduction overlap, reducing cross-conduction loss and MOSFET stress.	Use Scenario: Freewheeling path across primary-side inductor in non-isolated buck-derived topology. IC Role / Device Role / Timing Role: Provides low-loss return path for inductor current during high-side switch off-time. Use Value: 0.95 V V_F limits voltage drop and power loss during continuous 1 A freewheeling conduction.
AC-DC Adapter Secondary Side	Industrial Motor Drive Snubber Network
Use Scenario: Output rectifier in universal-input 5 V/2 A adapter with active clamp flyback. IC Role / Device Role / Timing Role: Conducts forward current during transformer reset phase; blocks reverse voltage during primary conduction. Use Value: 200 V V_RRM accommodates reflected voltage spikes up to 180 V with safety margin.	Use Scenario: Clamp diode in RC snubber network across IGBT collector-emitter in 24 V servo drive. IC Role / Device Role / Timing Role: Rapidly clamps inductive kickback voltage spike during IGBT turn-off. Use Value: 30 A I_FSM handles short-duration energy dump without degradation under repeated switching.

DC-DC Converter Output Rectification

Switch-Mode Power Supply Freewheeling

Use Scenario: Secondary-side rectification in isolated 12 V/1 A flyback converter operating at 250 kHz.

IC Role / Device Role / Timing Role: Unidirectional current path converting transformer AC output to regulated DC; recovers before next switching cycle.

Use Value: 35 ns t_rr prevents reverse conduction overlap, reducing cross-conduction loss and MOSFET stress.

Use Scenario: Freewheeling path across primary-side inductor in non-isolated buck-derived topology.

IC Role / Device Role / Timing Role: Provides low-loss return path for inductor current during high-side switch off-time.

Use Value: 0.95 V V_F limits voltage drop and power loss during continuous 1 A freewheeling conduction.

AC-DC Adapter Secondary Side

Industrial Motor Drive Snubber Network

Use Scenario: Output rectifier in universal-input 5 V/2 A adapter with active clamp flyback.

IC Role / Device Role / Timing Role: Conducts forward current during transformer reset phase; blocks reverse voltage during primary conduction.

Use Value: 200 V V_RRM accommodates reflected voltage spikes up to 180 V with safety margin.

Use Scenario: Clamp diode in RC snubber network across IGBT collector-emitter in 24 V servo drive.

IC Role / Device Role / Timing Role: Rapidly clamps inductive kickback voltage spike during IGBT turn-off.

Use Value: 30 A I_FSM handles short-duration energy dump without degradation under repeated switching.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R02U	V_RRM = 200 V, t_rr = 30 ns, V_F = 0.92 V @ 1 A - slightly faster and lower V_F, but DO-204AL package identical	Same footprint and thermal profile; marginally better efficiency in high-duty-cycle operation	Preferred where <5 ns t_rr reduction justifies sourcing from STMicroelectronics
ES1D-E3/57T	V_RRM = 200 V, t_rr = 35 ns, V_F = 0.97 V @ 1 A - nearly identical specs, but in SMB (DO-214AA) surface-mount package	Requires PCB layout change; suited for space-constrained SMT designs instead of through-hole	Select when transitioning to automated SMT assembly and board real estate is constrained

Compared with STTH1R02U and ES1D-E3/57T, the SF14G-K offers identical V_RRM and t_rr to the latter while delivering lower V_F than most DO-41 alternatives - making it optimal for cost-sensitive, leaded, high-efficiency 1 A rectification where thermal management relies on lead conduction.

Availability

SF14G-K is available at Aetrix Electronics and suitable for DC-DC converters, switching mode inverters, and freewheeling circuits requiring stable component supply, long-term manufacturability, and RoHS-compliant discrete diodes.

Supply support for SF14G-K 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 global industrial, computing, and consumer markets since 1979.

The SFxxG-K series was designed specifically for high-frequency, high-efficiency secondary-side rectification in compact AC-DC and DC-DC power supplies - emphasizing fast recovery, low V_F, and reliable DO-41 packaging for cost-effective through-hole manufacturing.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for SF14G-K?

The SF14G-K has a V_RRM of 200 V, confirmed in the Absolute Maximum Ratings table across all versions of the SF11G-K–SF18G-K family. This value is fixed per part number suffix: "14" corresponds to 200 V, and applies under continuous operation at T_J ≤ 150°C. Exceeding this voltage risks avalanche breakdown and irreversible damage to the SF14G-K.

What is the forward voltage (V_F) of SF14G-K at its rated current?

The SF14G-K exhibits a typical forward voltage of 0.95 V at I_F = 1 A and T_J = 25°C, as specified in the Electrical Specifications table. This value is measured under pulsed conditions (PW = 0.3 ms) to avoid self-heating effects. At higher junction temperatures, V_F decreases slightly, but remains ≤ 1.05 V across the full operating range of the SF14G-K.

Does SF14G-K have a defined reverse recovery time (t_rr)?

Yes, the SF14G-K has a maximum reverse recovery time of 35 ns, tested under standardized conditions: I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This parameter is explicitly listed for SF11G-K through SF14G-K in the Electrical Specifications section and distinguishes the SF14G-K from slower general-purpose rectifiers used in line-frequency applications.

What package type does SF14G-K use, and is it RoHS compliant?

The SF14G-K uses the DO-204AL (DO-41) axial-leaded package with pure tin-plated leads, and is fully RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound meets UL 94V-0 flammability rating, and the device passes JESD201 Class 1A whisker testing - all verified in the Mechanical Data and Features sections of the SF14G-K documentation.

Can SF14G-K replace SF13G-K or SF15G-K in an existing design?

No - SF14G-K is not a direct replacement for SF13G-K (150 V) or SF15G-K (300 V), as V_RRM differs significantly. Substituting SF14G-K in a 300 V design risks reverse breakdown; using it in a 150 V design is electrically safe but may incur unnecessary cost and thermal overhead. Always verify V_RRM, t_rr, and V_F match the original SF14G-K specification before interchange.

SF14G-K Specifications

Product attributes: Attribute value

Manufacturer:: Taiwan Semiconductor Corporation

Series:: -

Package/Case:: DO-204AL, DO-41, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Standard

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

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AL (DO-41)

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

SF14G-K FAQ

1.How can I place an order for SF14G-K through Aetrix?

Please submit a Request for Quotation (RFQ) for SF14G-K 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 SF14G-K reliable?

The price and inventory of SF14G-K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF14G-K is usually 5 days.

3.What payment methods are accepted for SF14G-K?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF14G-K transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF14G-K?

SF14G-K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF14G-K 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 SF14G-K?

For technical support, including SF14G-K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF14G-K requirements.

6.How does Aetrix verify that SF14G-K is sourced from the original manufacturer or authorized distributors?

All SF14G-K 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 SF14G-K meets industry standards.

7.What is the process for return or replacement of SF14G-K?

All SF14G-K units undergo pre-shipment inspection (PSI). If there is an issue with SF14G-K, 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 SF14G-K part is unused and in its original packaging.

Return procedure for SF14G-K:

1.Submit a request within 90 days.

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

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