2SK3878 Field Effect Transistor: Equivalent, Datasheet and Diagram
2SK3878 datasheet pdf and Unclassified product details from TOSHIBA stock available at Utmel









2SK3878 is a three-terminal silicon device. This article is going to introduce 2SK3878 pinout, equivalents, applications, and other details.

Test mosfet on easy way!!
2SK3878 Description
2SK3878 is a three-terminal silicon device with current conduction capability of 9A, fast switching speed, l ow on-state resistance, breakdown voltage rating of 900V, and max.
threshold voltage of 4 volts.
They are designed for use in applications such as switched mode power supplies, DC to DC converters, motor control circuits,UPS, switching regulator and general purpose switching applications .
2SK3878 Pinout

2SK3878 Pinout
2SK3878 Features
Marking Code: K3878
Type of Transistor : MOSFET
Type of Control Channel: N -Channel
Maximum Power Dissipation (Pd): 150 W
Maximum Drain-Source Voltage |Vds|: 900 V
Maximum Gate-Source Voltage |Vgs|: 30 V
Maximum Gate-Threshold Voltage |Vgs(th)|: 4 V
Maximum Drain Current |Id|: 9 A
Maximum Junction Temperature (Tj): 150 °C
Total Gate Charge (Qg): 60 nC
Rise Time (tr): 25 nS
Drain-Source Capacitance (Cd): 190 pF
Maximum Drain-Source On-State Resistance (Rds): 1.3 Ohm
Package: SC65 TO3P
Specifications
- TypeParameter
- Package / Case
refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.
TO-3P - Current - Continuous Drain (Id) @ 25℃9A
- Power Dissipation (Max)150W
- Packaging
Semiconductor package is a carrier / shell used to contain and cover one or more semiconductor components or integrated circuits. The material of the shell can be metal, plastic, glass or ceramic.
Tube-packed - FET Type
"FET Type" refers to the type of Field-Effect Transistor (FET) being used in an electronic component. FETs are three-terminal semiconductor devices that can be classified into different types based on their construction and operation. The main types of FETs include Metal-Oxide-Semiconductor FETs (MOSFETs), Junction FETs (JFETs), and Insulated-Gate Bipolar Transistors (IGBTs).Each type of FET has its own unique characteristics and applications. MOSFETs are commonly used in digital circuits due to their high input impedance and low power consumption. JFETs are often used in low-noise amplifiers and switching circuits. IGBTs combine the high input impedance of MOSFETs with the high current-carrying capability of bipolar transistors, making them suitable for high-power applications like motor control and power inverters.When selecting an electronic component, understanding the FET type is crucial as it determines the device's performance and suitability for a specific application. It is important to consider factors such as voltage ratings, current handling capabilities, switching speeds, and power dissipation when choosing the right FET type for a particular circuit design.
N-Channel - Rds On (Max) @ Id, Vgs
Rds On (Max) @ Id, Vgs refers to the maximum on-resistance of a MOSFET or similar transistor when it is fully turned on or in the saturation region. It is specified at a given drain current (Id) and gate-source voltage (Vgs). This parameter indicates how much resistance the component will offer when conducting, impacting power loss and efficiency in a circuit. Lower Rds On values are preferred for better performance in switching applications.
1.3Ω@4A,10V - Vgs(th) (Max) @ Id
The parameter "Vgs(th) (Max) @ Id" in electronic components refers to the maximum gate-source threshold voltage at a specified drain current (Id). This parameter is commonly found in field-effect transistors (FETs) and is used to define the minimum voltage required at the gate terminal to turn on the transistor and allow current to flow from the drain to the source. The maximum value indicates the upper limit of this threshold voltage under specified operating conditions. It is an important parameter for determining the proper biasing and operating conditions of the FET in a circuit to ensure proper functionality and performance.
4V@1mA - Drain to Source Voltage (Vdss)
The Drain to Source Voltage (Vdss) is a key parameter in electronic components, particularly in field-effect transistors (FETs) such as MOSFETs. It refers to the maximum voltage that can be applied between the drain and source terminals of the FET without causing damage to the component. Exceeding this voltage limit can lead to breakdown and potentially permanent damage to the device.Vdss is an important specification to consider when designing or selecting components for a circuit, as it determines the operating range and reliability of the FET. It is crucial to ensure that the Vdss rating of the component is higher than the maximum voltage expected in the circuit to prevent failures and ensure proper functionality.In summary, the Drain to Source Voltage (Vdss) is a critical parameter that defines the maximum voltage tolerance of a FET component and plays a significant role in determining the overall performance and reliability of electronic circuits.
900V - RoHS Status
RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.
RoHS Compliant
2SK3878 Applications
Low drain-source ON resistance: RDS (ON) = 1.0 Ω (typ.)
High forward transfer admittance : ⎪Yfs⎪ = 7.0 S (typ.)
Low leakage current: IDSS = 100 μA (max) (VDS = 720 V)
Enhancement model: Vth = 2.0~4.0 V (VDS = 10 V, ID = 1 mA)
2SK3878 Equivalents
2SK3757 , 2SK3766 , 2SK3767 , 2SK3798 , 2SK3799 , 2SK3842 , 2SK3843 , 2SK3845 , 2SK4106 , 2SK3880 , 2SK3940 , 2SK4003 , 2SK4013 , 2SK4014 , 2SK4017 , 2SK4023 , 2SK4026
2SK3878 Package

2SK3878 Package
2SK3878 Manufacturer
Toshiba is a world leader and innovator in pioneering high technology, a diversified manufacturer and marketer of advanced electronic and electrical products spanning information & communications systems; digital consumer products; electronic devices and components; power systems, including nuclear energy; industrial and social infrastructure systems; and home appliances. Toshiba was founded in 1875, and today operates a global network of more than 740 companies, with 204,000 employees worldwide and annual sales surpassing 6.3 trillion yen (US$68 billion).
What is the breakdown voltage rating of a three-terminal silicon device?
900V
What is 2SK3878?
2SK3878 is a three-terminal silicon device.
What is 2SK3878 used for?
It is designed for use in switched-mode power supplies.
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