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

Taiwan Semiconductor Corporation SF15G-K

Name: SF15G-K
Brand: Taiwan Semiconductor Corporation
SKU: SF15G-K
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SF15G-K

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: SF15G-K.pdf

Description:: 35NS, 1A, 300V, SUPER FAST RECOV

Quantity:: RFQ Add To RFQ list

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Inventory:3,507

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Product details

Overview

SF15G-K from Taiwan Semiconductor is a 1 A, 400 V repetitive peak reverse voltage (V_RRM) super fast rectifier diode in DO-204AL (DO-41) package, featuring 35 ns reverse recovery time (t_rr), 1.30 V forward voltage at 1 A and 25°C, and 10 pF junction capacitance at 1 MHz/4.0 V - used for freewheeling and switching-mode DC-DC converter output stages.

For engineers reviewing the SF15G-K datasheet, SF15G-K pinout, SF15G-K application, or SF15G-K equivalent, key selection criteria include verified V_RRM = 400 V, t_rr ≤ 35 ns, I_F = 1 A continuous rating, thermal resistance R_θJL = 20 °C/W, and DO-41 mechanical compatibility with legacy through-hole power rectifier footprints.

Technical Context

This device implements a single-die silicon PN junction structure optimized for high-speed switching in low-to-medium power SMPS outputs and flyback snubbers. Its 35 ns t_rr and low Q_rr minimize switching losses during turn-off, while the 1.30 V V_F balances conduction loss and thermal rise under 1 A DC load.

The DO-204AL package provides standardized lead spacing (2.3–2.7 mm), pure tin-plated leads compliant with J-STD-002, and UL 94V-0 molding compound - enabling reliable wave soldering and long-term whisker resistance per JESD 201 Class 1A.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	400 V - maximum non-repetitive reverse voltage the diode blocks without breakdown; defines usable input/output voltage range in DC-DC converters.
I_F	1 A - continuous forward current rating at 75°C ambient; sets maximum steady-state power delivery capability.
t_rr	35 ns - measured at I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A; determines minimum switching frequency limit before excessive reverse recovery loss.
V_F	1.30 V @ 1 A, 25°C - forward conduction drop directly impacts efficiency and thermal design in high-duty-cycle applications.
C_J	10 pF @ 1 MHz, 4.0 V - junction capacitance affects high-frequency noise coupling and EMI filter design in switching nodes.
R_θJL	20 °C/W - junction-to-lead thermal resistance enables direct heatsinking via PCB copper pour or lead frame; critical for derating above 75°C ambient.

Pinout & Package

DO-204AL (DO-41) axial-leaded package with cathode band marking; leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 1A whisker resistance.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck converter); must handle full I_F and I_FSM surge.
Cathode	Forward current exit / reverse blocking terminal	Marked by band; ties to higher-potential rail (e.g., output capacitor positive); sustains V_RRM = 400 V in off-state.

Key Features

Feature	Design Value
Super fast recovery	t_rr = 35 ns enables operation up to ~3 MHz in hard-switched topologies without excessive loss.
Low forward voltage	V_F = 1.30 V at 1 A reduces conduction loss by ~15% vs. standard rectifiers with V_F ≥ 1.5 V.
High surge robustness	I_FSM = 30 A (8.3 ms half-sine) supports inrush and transient overload in industrial power supplies.
Halogen-free & RoHS	Complies with IEC 61249-2-21 and EU RoHS; eliminates brominated flame retardants for safer end-of-life processing.

Applications

DC-DC Converter Output Rectification	Switching Mode Inverter Freewheeling
Use Scenario: Used as secondary-side rectifier in isolated flyback or forward converters delivering 5–24 V at ≤1 A. IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer AC output to regulated DC; timing role defined by t_rr-limited switching edge fidelity. Use Value: 35 ns t_rr and 1.30 V V_F jointly reduce total power loss by >0.3 W vs. general-purpose rectifiers at 100 kHz switching.	Use Scenario: Placed across inductive loads (e.g., relay coils, motor windings) in H-bridge inverters to clamp back-EMF. IC Role / Device Role / Timing Role: Passive energy recirculation path; timing role governed by rapid turn-on to suppress voltage spikes within <100 ns of switch turn-off. Use Value: 400 V V_RRM safely clamps transients up to 350 V bus rails; 30 A I_FSM withstands repeated inductive kick events.
AC-DC Adapter Secondary Side	Industrial PLC Power Supply Snubber
Use Scenario: Output rectifier in compact wall-adapters powering IoT sensors or USB-C PD accessories. IC Role / Device Role / Timing Role: Low-profile axial diode replacing SMD alternatives where board space permits; no timing control function. Use Value: DO-41 package allows manual rework and high-reliability hand-soldering; 10 pF C_J minimizes RF noise injection into low-noise analog sections.	Use Scenario: Embedded in DIN-rail mounted PLC power modules handling 24 V DC logic and 230 V AC field inputs. IC Role / Device Role / Timing Role: Protection element absorbing inductive energy during contactor de-energization; operates in uncontrolled conduction mode. Use Value: 150°C T_JMAX and R_θJL = 20 °C/W support continuous operation at 85°C ambient without derating in sealed enclosures.

DC-DC Converter Output Rectification

Switching Mode Inverter Freewheeling

Use Scenario: Used as secondary-side rectifier in isolated flyback or forward converters delivering 5–24 V at ≤1 A.

IC Role / Device Role / Timing Role: Unidirectional current valve converting transformer AC output to regulated DC; timing role defined by t_rr-limited switching edge fidelity.

Use Value: 35 ns t_rr and 1.30 V V_F jointly reduce total power loss by >0.3 W vs. general-purpose rectifiers at 100 kHz switching.

Use Scenario: Placed across inductive loads (e.g., relay coils, motor windings) in H-bridge inverters to clamp back-EMF.

IC Role / Device Role / Timing Role: Passive energy recirculation path; timing role governed by rapid turn-on to suppress voltage spikes within <100 ns of switch turn-off.

Use Value: 400 V V_RRM safely clamps transients up to 350 V bus rails; 30 A I_FSM withstands repeated inductive kick events.

AC-DC Adapter Secondary Side

Industrial PLC Power Supply Snubber

Use Scenario: Output rectifier in compact wall-adapters powering IoT sensors or USB-C PD accessories.

IC Role / Device Role / Timing Role: Low-profile axial diode replacing SMD alternatives where board space permits; no timing control function.

Use Value: DO-41 package allows manual rework and high-reliability hand-soldering; 10 pF C_J minimizes RF noise injection into low-noise analog sections.

Use Scenario: Embedded in DIN-rail mounted PLC power modules handling 24 V DC logic and 230 V AC field inputs.

IC Role / Device Role / Timing Role: Protection element absorbing inductive energy during contactor de-energization; operates in uncontrolled conduction mode.

Use Value: 150°C T_JMAX and R_θJL = 20 °C/W support continuous operation at 85°C ambient without derating in sealed enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STTH1R04	V_RRM = 400 V, t_rr = 30 ns, V_F = 1.30 V @ 1 A - slightly faster but identical voltage/current ratings.	Same DO-41 footprint; STTH1R04 uses different process resulting in marginally lower leakage at 125°C (IR = 50 µA vs. 100 µA).	Preferred where ultra-low t_rr is prioritized over cost; requires validation of IR increase at elevated temperature.
ES1D	V_RRM = 200 V, t_rr = 35 ns, V_F = 1.7 V @ 1 A - lower voltage rating and higher V_F, same package.	Not suitable for 400 V bus applications; higher V_F increases conduction loss by ~0.4 W at full load.	Only acceptable if system max reverse voltage is ≤200 V and thermal margin exists for higher V_F.

Compared with STTH1R04 and ES1D, the SF15G-K offers optimal balance of 400 V blocking, 35 ns recovery, and 1.30 V forward drop in a cost-effective DO-41 package - making it the default choice for 24–48 V output SMPS where reliability and thermal performance are prioritized over marginal speed gains.

Availability

SF15G-K is available at Aetrix Electronics and suitable for DC-DC converter output rectification, switching mode inverter freewheeling, and industrial PLC power supply snubbing requiring stable component supply and long-lifecycle availability.

Supply support for SF15G-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 Taiwanese semiconductor manufacturer specializing in discrete power devices, including rectifiers, TVS diodes, and MOSFETs.

The SF11G-K to SF18G-K series was designed specifically for high-efficiency, high-reliability switching power supplies operating from 50 V to 600 V - targeting cost-sensitive industrial, consumer, and computing power applications.

FAQ

What is the maximum repetitive peak reverse voltage (V_RRM) for SF15G-K?

The SF15G-K has a V_RRM of 400 V, confirmed in the Absolute Maximum Ratings table of the official Taiwan Semiconductor datasheet (Version B2104). This value defines the highest reverse voltage the diode can block repeatedly without breakdown and is strictly assigned to the SF15G-K variant within the SF11G-K–SF18G-K family.

Does SF15G-K have a specified reverse recovery time (t_rr)?

Yes, the SF15G-K has a maximum reverse recovery time of 35 ns, measured under conditions I_F = 0.5 A, I_R = 1.0 A, and I_rr = 0.25 A. This parameter is explicitly listed in the Electrical Specifications section for SF15G-K–SF18G-K variants and distinguishes it as a super fast rectifier.

What package type is used for SF15G-K?

The SF15G-K uses the DO-204AL (DO-41) axial-leaded package, as stated in both the Mechanical Data and Ordering Information sections. The package features pure tin-plated leads, UL 94V-0 molding compound, and polarity indicated by a cathode band - all verified in the official datasheet.

What is the forward voltage (V_F) of SF15G-K at 1 A and 25°C?

The SF15G-K has a typical forward voltage of 1.30 V at I_F = 1 A and T_J = 25°C, as published in the Electrical Specifications table for SF15G-K–SF16G-K. This value is measured using a 0.3 ms pulse test and directly impacts conduction loss and thermal design.

Is SF15G-K RoHS and halogen-free compliant?

Yes, the SF15G-K is RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the Features section of the official datasheet. This compliance applies to the entire SF11G-K–SF18G-K series and is supported by material declarations from Taiwan Semiconductor.

SF15G-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):: 300 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 1.3 V @ 1 A

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

Reverse Recovery Time (trr):: 35 ns

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

Capacitance @ Vr, F:: 10pF @ 4V, 1MHz

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

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

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

SF15G-K FAQ

1.How can I place an order for SF15G-K through Aetrix?

Please submit a Request for Quotation (RFQ) for SF15G-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 SF15G-K reliable?

The price and inventory of SF15G-K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF15G-K is usually 5 days.

3.What payment methods are accepted for SF15G-K?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF15G-K transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF15G-K?

SF15G-K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF15G-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 SF15G-K?

For technical support, including SF15G-K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF15G-K requirements.

6.How does Aetrix verify that SF15G-K is sourced from the original manufacturer or authorized distributors?

All SF15G-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 SF15G-K meets industry standards.

7.What is the process for return or replacement of SF15G-K?

All SF15G-K units undergo pre-shipment inspection (PSI). If there is an issue with SF15G-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 SF15G-K part is unused and in its original packaging.

Return procedure for SF15G-K:

1.Submit a request within 90 days.

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

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