Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Taiwan Semiconductor Corporation SF18G-K

Name: SF18G-K
Brand: Taiwan Semiconductor Corporation
SKU: SF18G-K
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SF18G-K

Manufacturer:: Taiwan Semiconductor Corporation

Category:: Single Diodes

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

Datasheet:: SF18G-K.pdf

Description:: 35NS, 1A, 600V, SUPER FAST RECOV

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:6,072

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SF18G-K from Taiwan Semiconductor is a 600V, 1A super fast rectifier diode in DO-204AL (DO-41) package, featuring 1.70V forward voltage at 1A and 35ns reverse recovery time, used for freewheeling and high-frequency switching in DC-DC converters and inverters.

For engineers reviewing the SF18G-K datasheet, SF18G-K pinout, SF18G-K application, or SF18G-K equivalent, key selection criteria include peak reverse voltage rating, forward voltage drop at rated current, thermal resistance, reverse recovery time, and DO-41 mechanical compatibility in space-constrained power stages.

Technical Context

This device is a single-die, silicon planar junction super fast recovery rectifier optimized for high-efficiency switching power supplies. Its 600V V_RRM, 30A I_FSM, and 35ns t_rr enable reliable operation in hard-switched topologies with minimal switching loss.

Thermal performance is defined by R_θJL = 20°C/W and R_θJA = 80°C/W, supporting continuous 1A conduction at ambient temperatures up to 75°C without forced cooling. The cathode-band polarity marking and pure tin-plated leads comply with J-STD-002 solderability standards.

Key Specifications

Parameter	Value and Actual Design Meaning
V_RRM	600 V - Maximum repetitive reverse voltage before breakdown; sets upper limit for DC bus or snubber voltage handling
I_F	1 A - Continuous average forward current; defines steady-state power stage conduction capability
t_rr	35 ns - Reverse recovery time at IF = 0.5A, IR = 1.0A, Irr = 0.25A; determines minimum dead-time margin in synchronous rectification
V_F	1.70 V @ 1A, 25°C - Forward voltage drop; directly impacts conduction loss and thermal design in high-duty-cycle applications
R_θJL	20 °C/W - Junction-to-lead thermal resistance; enables direct heatsinking via PCB copper pour or lead frame in TO-220-replacement layouts
C_J	10 pF @ 1MHz, 4V - Junction capacitance; affects high-frequency EMI generation and gate-drive loading in flyback snubbers

Pinout & Package

Package: DO-204AL (DO-41), axial-leaded, epoxy-molded case with UL 94V-0 rating and cathode band polarity indicator. Weight: 0.330 g.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential node (e.g., switch node in buck freewheel path); requires low-inductance trace routing
Cathode	Forward current exit / reverse blocking terminal	Marked by colored band; ties to output rail or ground return; critical for EMI filtering placement

Key Features

Feature	Design Value
Super fast recovery	35 ns t_rr minimizes switching loss and ringing in 100–500 kHz SMPS designs
Low forward voltage	1.70 V @ 1A reduces conduction loss by ~15% vs. standard fast rectifiers at same current
High surge rating	30 A I_FSM (8.3 ms half-sine) supports inrush and transient overload without failure
RoHS & halogen-free	Complies with IEC 61249-2-21; suitable for consumer and industrial products requiring green compliance

Applications

DC-DC Converters	Switching Inverters
Use Scenario: Output rectification in isolated flyback or forward converters operating at 200–350 kHz. IC Role / Device Role / Timing Role: Freewheeling diode conducting during MOSFET off-time; defines output voltage ripple and efficiency floor. Use Value: 35 ns t_rr prevents reverse recovery shoot-through in synchronous designs; 1.70 V V_F limits power loss to ≤1.7 W at full load.	Use Scenario: Bridge leg anti-parallel diode in single-phase motor drive inverters with 12–48 V DC bus. IC Role / Device Role / Timing Role: Reactive energy recirculation path during PWM dead-time; clamps inductive kickback. Use Value: 600 V V_RRM provides 2× safety margin over 24–48 V systems; DO-41 footprint allows compact dual-diode layout.
Freewheeling Circuits	SMPS Secondary Rectification
Use Scenario: Inductor current path in buck or boost regulators powering FPGA core rails or telecom modules. IC Role / Device Role / Timing Role: Unidirectional current path during switch-off phase; sustains load current continuity. Use Value: 1 A I_F rating matches typical point-of-load current; 20°C/W R_θJL enables direct PCB copper thermal coupling.	Use Scenario: Secondary-side rectification in offline AC-DC adapters with <15 W output. IC Role / Device Role / Timing Role: High-frequency rectifier converting transformer secondary AC to regulated DC. Use Value: 10 pF C_J reduces capacitive coupling noise into feedback loop; RoHS/halogen-free compliance meets end-product certification.

DC-DC Converters

Switching Inverters

Use Scenario: Output rectification in isolated flyback or forward converters operating at 200–350 kHz.

IC Role / Device Role / Timing Role: Freewheeling diode conducting during MOSFET off-time; defines output voltage ripple and efficiency floor.

Use Value: 35 ns t_rr prevents reverse recovery shoot-through in synchronous designs; 1.70 V V_F limits power loss to ≤1.7 W at full load.

Use Scenario: Bridge leg anti-parallel diode in single-phase motor drive inverters with 12–48 V DC bus.

IC Role / Device Role / Timing Role: Reactive energy recirculation path during PWM dead-time; clamps inductive kickback.

Use Value: 600 V V_RRM provides 2× safety margin over 24–48 V systems; DO-41 footprint allows compact dual-diode layout.

Freewheeling Circuits

SMPS Secondary Rectification

Use Scenario: Inductor current path in buck or boost regulators powering FPGA core rails or telecom modules.

IC Role / Device Role / Timing Role: Unidirectional current path during switch-off phase; sustains load current continuity.

Use Value: 1 A I_F rating matches typical point-of-load current; 20°C/W R_θJL enables direct PCB copper thermal coupling.

Use Scenario: Secondary-side rectification in offline AC-DC adapters with <15 W output.

IC Role / Device Role / Timing Role: High-frequency rectifier converting transformer secondary AC to regulated DC.

Use Value: 10 pF C_J reduces capacitive coupling noise into feedback loop; RoHS/halogen-free compliance meets end-product certification.

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	Same 600 V V_RRM, 1 A I_F, but 50 ns t_rr and 1.85 V V_F; DO-41 package	Higher V_F increases conduction loss by ~9%; slower t_rr may require larger dead-time in synchronous designs	Acceptable where efficiency margin >5% exists and layout allows minor timing adjustment
ES1J	600 V V_RRM, 1 A I_F, 35 ns t_rr, but 1.7 V V_F; same DO-41 package and marking polarity	Near-identical electrical specs; differs in thermal resistance (R_θJA = 75°C/W vs. 80°C/W) and JEDEC qualification level	Drop-in alternative with verified board-level compatibility and identical footprint

Compared with STTH1R06U and ES1J, the SF18G-K offers the lowest forward voltage among 600 V/1 A super fast rectifiers in DO-41, delivering superior thermal performance under sustained 1 A loads while maintaining identical pinout and mounting requirements.

Availability

SF18G-K is available at Aetrix Electronics and suitable for DC-DC converters, switching inverters, and freewheeling circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant discrete diodes.

Supply support for SF18G-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 power, automotive, and industrial markets since 1979.

The SF11G-K to SF18G-K series targets cost-sensitive, high-volume power conversion applications where reliability, thermal robustness, and fast switching are essential-especially in consumer adapters, LED drivers, and industrial SMPS.

FAQ

What is the maximum repetitive peak reverse voltage rating for SF18G-K?

The SF18G-K has a maximum repetitive peak reverse voltage (V_RRM) of 600 V. This rating ensures safe operation in circuits with DC bus voltages up to 600 V, including 400 V PFC outputs and 24–48 V inverter bridges with 2× safety margin. Exceeding this voltage risks avalanche breakdown and permanent device failure.

What is the forward voltage drop of SF18G-K at its rated current?

The SF18G-K exhibits a typical forward voltage (V_F) of 1.70 V at 1 A and 25°C junction temperature. This value is measured under pulsed conditions (PW = 0.3 ms) and represents the conduction loss baseline for thermal modeling; actual V_F rises to ~1.85 V at 125°C.

Does SF18G-K have a specified reverse recovery time, and how is it tested?

Yes, SF18G-K has a maximum reverse recovery time (t_rr) of 35 ns. It is measured under standardized conditions: I_F = 0.5 A, I_R = 1.0 A, I_rr = 0.25 A, with test circuit per Fig.6 in the datasheet. This parameter is critical for minimizing switching loss in high-frequency converters above 100 kHz.

What package type and lead finish does SF18G-K use?

SF18G-K uses the DO-204AL (DO-41) axial package with pure tin-plated leads compliant with J-STD-002 solderability requirements. The case meets UL 94V-0 flammability rating, and polarity is indicated by a cathode band. Weight is 0.330 g.

Is SF18G-K suitable for automotive applications?

SF18G-K is not qualified to AEC-Q101 or automotive-grade reliability standards. While its -55°C to +150°C operating range overlaps with some automotive ambient conditions, Taiwan Semiconductor explicitly states these devices are not designed for medical, life-saving, or life-sustaining applications-including automotive safety-critical systems.

SF18G-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):: 600 V

Current - Average Rectified (Io):: 1A

Voltage - Forward (Vf) (Max) @ If:: 1.7 V @ 1 A

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

Reverse Recovery Time (trr):: 35 ns

Current - Reverse Leakage @ Vr:: 5 µA @ 600 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

SF18G-K FAQ

1.How can I place an order for SF18G-K through Aetrix?

Please submit a Request for Quotation (RFQ) for SF18G-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 SF18G-K reliable?

The price and inventory of SF18G-K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SF18G-K is usually 5 days.

3.What payment methods are accepted for SF18G-K?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SF18G-K transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SF18G-K?

SF18G-K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SF18G-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 SF18G-K?

For technical support, including SF18G-K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SF18G-K requirements.

6.How does Aetrix verify that SF18G-K is sourced from the original manufacturer or authorized distributors?

All SF18G-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 SF18G-K meets industry standards.

7.What is the process for return or replacement of SF18G-K?

All SF18G-K units undergo pre-shipment inspection (PSI). If there is an issue with SF18G-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 SF18G-K part is unused and in its original packaging.

Return procedure for SF18G-K:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…