Welcome to Weijie Semiconductor
- Discrete Semiconductor Products
- Transistors - FETs, MOSFETs - Single
Image
Part Number
Manufacturer
Description
Unit Price
In Stock
.jpg "Show details for 2SK4017(Q)")
2SK4017(Q)
Toshiba Semiconductor and Storage
Manufacturer : Toshiba Semiconductor and Storage
Packaging : Bulk
Series : U-MOSIII
Part Status : Active
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 60V
Current - Continuous Drain (Id) @ 25°C : 5A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 4V, 10V
Rds On (Max) @ Id, Vgs : 100 mOhm @ 2.5A, 10V
Vgs(th) (Max) @ Id : 2.5V @ 1mA
Gate Charge (Qg) (Max) @ Vgs : 15nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 730pF @ 10V
FET Feature : -
Power Dissipation (Max) : 20W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Through Hole
Supplier Device Package : PW-MOLD2
Package / Case : TO-251-3 Stub Leads, IPak
Packaging : Bulk
Series : U-MOSIII
Part Status : Active
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 60V
Current - Continuous Drain (Id) @ 25°C : 5A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 4V, 10V
Rds On (Max) @ Id, Vgs : 100 mOhm @ 2.5A, 10V
Vgs(th) (Max) @ Id : 2.5V @ 1mA
Gate Charge (Qg) (Max) @ Vgs : 15nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 730pF @ 10V
FET Feature : -
Power Dissipation (Max) : 20W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Through Hole
Supplier Device Package : PW-MOLD2
Package / Case : TO-251-3 Stub Leads, IPak
0
100 in stock
.jpg "Show details for 2SK4021(Q)")
2SK4021(Q)
Toshiba Semiconductor and Storage
Manufacturer : Toshiba Semiconductor and Storage
Packaging : Bulk
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 250V
Current - Continuous Drain (Id) @ 25°C : 4.5A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 10V
Rds On (Max) @ Id, Vgs : 1 Ohm @ 2.5A, 10V
Vgs(th) (Max) @ Id : 3.5V @ 1mA
Gate Charge (Qg) (Max) @ Vgs : 10nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 440pF @ 10V
FET Feature : -
Power Dissipation (Max) : 20W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Through Hole
Supplier Device Package : PW-MOLD2
Package / Case : TO-251-3 Stub Leads, IPak
Packaging : Bulk
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 250V
Current - Continuous Drain (Id) @ 25°C : 4.5A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 10V
Rds On (Max) @ Id, Vgs : 1 Ohm @ 2.5A, 10V
Vgs(th) (Max) @ Id : 3.5V @ 1mA
Gate Charge (Qg) (Max) @ Vgs : 10nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 440pF @ 10V
FET Feature : -
Power Dissipation (Max) : 20W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Through Hole
Supplier Device Package : PW-MOLD2
Package / Case : TO-251-3 Stub Leads, IPak
0
100 in stock
2SK4043LS
Aptina / ON Semiconductor
Manufacturer : ON Semiconductor
Packaging : Bulk
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 30V
Current - Continuous Drain (Id) @ 25°C : 20A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 2.5V, 4V
Rds On (Max) @ Id, Vgs : 21 mOhm @ 10A, 4V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 37nC @ 4V
Vgs (Max) : ±10V
Input Capacitance (Ciss) (Max) @ Vds : 3000pF @ 20V
FET Feature : -
Power Dissipation (Max) : 2W (Ta), 20W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Through Hole
Supplier Device Package : TO-220FI(LS)
Package / Case : TO-220-3 Full Pack
Packaging : Bulk
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 30V
Current - Continuous Drain (Id) @ 25°C : 20A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 2.5V, 4V
Rds On (Max) @ Id, Vgs : 21 mOhm @ 10A, 4V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 37nC @ 4V
Vgs (Max) : ±10V
Input Capacitance (Ciss) (Max) @ Vds : 3000pF @ 20V
FET Feature : -
Power Dissipation (Max) : 2W (Ta), 20W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Through Hole
Supplier Device Package : TO-220FI(LS)
Package / Case : TO-220-3 Full Pack
0
100 in stock
2SK4065-DL-1E
Aptina / ON Semiconductor
Manufacturer : ON Semiconductor
Packaging : Tape & Reel (TR)
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 75V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 4V, 10V
Rds On (Max) @ Id, Vgs : 6 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 12200pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Surface Mount
Supplier Device Package : TO-263-2
Package / Case : TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
Packaging : Tape & Reel (TR)
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 75V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 4V, 10V
Rds On (Max) @ Id, Vgs : 6 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 12200pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Surface Mount
Supplier Device Package : TO-263-2
Package / Case : TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
0
100 in stock
2SK4065-DL-1EX
Aptina / ON Semiconductor
Manufacturer : ON Semiconductor
Packaging : Tape & Reel (TR)
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 75V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : -
Rds On (Max) @ Id, Vgs : 6 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : -
Input Capacitance (Ciss) (Max) @ Vds : 12200pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Surface Mount
Supplier Device Package : TO-263-2
Package / Case : TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
Packaging : Tape & Reel (TR)
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 75V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : -
Rds On (Max) @ Id, Vgs : 6 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : -
Input Capacitance (Ciss) (Max) @ Vds : 12200pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Surface Mount
Supplier Device Package : TO-263-2
Package / Case : TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
0
100 in stock
2SK4065-DL-E
Aptina / ON Semiconductor
Manufacturer : ON Semiconductor
Packaging : Tape & Reel (TR)
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 75V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 4V, 10V
Rds On (Max) @ Id, Vgs : 6 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 12200pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Surface Mount
Supplier Device Package : SMP-FD
Package / Case : TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
Packaging : Tape & Reel (TR)
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 75V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 4V, 10V
Rds On (Max) @ Id, Vgs : 6 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 12200pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Surface Mount
Supplier Device Package : SMP-FD
Package / Case : TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
0
100 in stock
2SK4065-E
Aptina / ON Semiconductor
Manufacturer : ON Semiconductor
Packaging : Bulk
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 75V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 4V, 10V
Rds On (Max) @ Id, Vgs : 6 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 12200pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Through Hole
Supplier Device Package : SMP
Package / Case : TO-220-3, Short Tab
Packaging : Bulk
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 75V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 4V, 10V
Rds On (Max) @ Id, Vgs : 6 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 12200pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Through Hole
Supplier Device Package : SMP
Package / Case : TO-220-3, Short Tab
0
100 in stock
2SK4066-1E
Aptina / ON Semiconductor
Manufacturer : ON Semiconductor
Packaging : Tube
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 60V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 4V, 10V
Rds On (Max) @ Id, Vgs : 4.7 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 12500pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Through Hole
Supplier Device Package : TO-262-3
Package / Case : TO-262-3 Long Leads, I²Pak, TO-262AA
Packaging : Tube
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 60V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 4V, 10V
Rds On (Max) @ Id, Vgs : 4.7 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 12500pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Through Hole
Supplier Device Package : TO-262-3
Package / Case : TO-262-3 Long Leads, I²Pak, TO-262AA
0
100 in stock
2SK4066-DL-1E
Aptina / ON Semiconductor
Manufacturer : ON Semiconductor
Packaging : Tape & Reel (TR)
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 60V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 4V, 10V
Rds On (Max) @ Id, Vgs : 4.7 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 12500pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Surface Mount
Supplier Device Package : TO-263-2
Package / Case : TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
Packaging : Tape & Reel (TR)
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 60V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 4V, 10V
Rds On (Max) @ Id, Vgs : 4.7 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 12500pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Surface Mount
Supplier Device Package : TO-263-2
Package / Case : TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
0
100 in stock
2SK4066-DL-1EX
Aptina / ON Semiconductor
Manufacturer : ON Semiconductor
Packaging : Tape & Reel (TR)
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 60V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : -
Rds On (Max) @ Id, Vgs : 4.7 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : -
Input Capacitance (Ciss) (Max) @ Vds : 12500pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Surface Mount
Supplier Device Package : TO-263-2
Package / Case : TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
Packaging : Tape & Reel (TR)
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 60V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : -
Rds On (Max) @ Id, Vgs : 4.7 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : -
Input Capacitance (Ciss) (Max) @ Vds : 12500pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Surface Mount
Supplier Device Package : TO-263-2
Package / Case : TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
0
100 in stock
2SK4066-DL-E
Aptina / ON Semiconductor
Manufacturer : ON Semiconductor
Packaging : Tape & Reel (TR)
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 60V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 4V, 10V
Rds On (Max) @ Id, Vgs : 4.7 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 12500pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Surface Mount
Supplier Device Package : SMP-FD
Package / Case : TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
Packaging : Tape & Reel (TR)
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 60V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 4V, 10V
Rds On (Max) @ Id, Vgs : 4.7 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 12500pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Surface Mount
Supplier Device Package : SMP-FD
Package / Case : TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
0
100 in stock
2SK4066-E
Aptina / ON Semiconductor
Manufacturer : ON Semiconductor
Packaging : Bulk
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 60V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 4V, 10V
Rds On (Max) @ Id, Vgs : 4.7 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 12500pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Through Hole
Supplier Device Package : SMP
Package / Case : TO-220-3, Short Tab
Packaging : Bulk
Series : -
Part Status : Obsolete
FET Type : N-Channel
Technology : MOSFET (Metal Oxide)
Drain to Source Voltage (Vdss) : 60V
Current - Continuous Drain (Id) @ 25°C : 100A (Ta)
Drive Voltage (Max Rds On, Min Rds On) : 4V, 10V
Rds On (Max) @ Id, Vgs : 4.7 mOhm @ 50A, 10V
Vgs(th) (Max) @ Id : -
Gate Charge (Qg) (Max) @ Vgs : 220nC @ 10V
Vgs (Max) : ±20V
Input Capacitance (Ciss) (Max) @ Vds : 12500pF @ 20V
FET Feature : -
Power Dissipation (Max) : 1.65W (Ta), 90W (Tc)
Operating Temperature : 150°C (TJ)
Mounting Type : Through Hole
Supplier Device Package : SMP
Package / Case : TO-220-3, Short Tab
0
100 in stock
New Original Stock
Competitive Prices
One-stop
Customer Service
Contact Weijie
- sales@ynnelec.com
- jay@ynnelec.com
- 1132 Nanguang Jiejia Building, No. 3037 Shennan Middle Road, Futian District, Shenzhen
Customer service
Copyright © 2025 Ynnelec. All rights reserved.
webdesign www.wzdzkf.com
Powered by www.wzdzkf.com