STF8N65M5

Vgs(th) (Max) @ Id:	5V @ 250µA
Package / Case:	TO-220-3 Full Pack
Supplier Device Package:	TO-220FP
Mounting Type:	Through Hole
Operating Temperature:	150°C (TJ)
Power Dissipation (Max):	25W (Tc)
FET Feature:	--
Input Capacitance (Ciss) (Max) @ Vds:	690pF @ 100V
Vgs (Max):	±25V
Gate Charge (Qg) (Max) @ Vgs:	15nC @ 10V
Series:	MDmesh™ V
Rds On (Max) @ Id, Vgs:	600 mOhm @ 3.5A, 10V
Drive Voltage (Max Rds On, Min Rds On):	10V
Current - Continuous Drain (Id) @ 25°C:	7A (Tc)
Drain to Source Voltage (Vdss):	650V
Technology:	MOSFET (Metal Oxide)
FET Type:	N-Channel
Part Status:	Active
Packaging:	Tube

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Introduction

The STF8N65M5 is an N-channel vertical DMOS FET that has been designed to operate in the very high frequency range, exceeding the general-purpose power range. It features very low on-resistance and an operating voltage of up to 500V.The STF8N65M5 is widely used in power switching applications. It is typically used as a switch or to reduce conduction loss in high power applications, such as switching power supplies, automotive device control, speakers, motors, and more.

Application Field

The STF8N65M5 is a valuable component for power electronics applications such as switching power supplies, motor control, automotive device control, and audio amplification. Its extended frequency range makes it suitable for high frequency switching applications with switching frequencies from 1kHz to 50MHz. It can also be used in low frequency digital circuits, such as low voltage/current sensing and load drivers.

Switch mode power supplies:

Here the STF8N65M5 is used as an on/off switch to control the output voltage of a switch mode power supply. It is capable of delivering currents up to 4A while making sure the output voltage is kept to within a desired level.

Audio Amplification:

The low on-resistance of the STF8N65M5 makes it a suitable component for audio amplifiers, where it can be used to switch to different settings quickly. Its capability to handle higher frequencies than general-purpose power FETs makes it ideal for use in modern audio systems.

Motor control:

In this application, the STF8N65M5 is switched on and off with a high frequency to control the speed of the motor. Since it is highly energy efficient and has low on-resistance, it is capable of providing the speed control accuracy that is necessary for controlling motors accurately.

Working Principle

The STF8N65M5 is a vertical DMOS FET, which means it is composed of a metal oxide semiconductor field effect transistor (MOSFET) structure fabricated vertically, rather than horizontally.The design of the STF8N65M5 allows it to operate at a much higher frequency range than general-purpose power FETs. At high frequencies, the on-resistance drops significantly, allowing it to switch quickly and accurately.The STF8N65M5 is capable of handling voltages of up to 500V. This allows it to be used in a wide variety of applications, such as motor control or switching power supplies.When the gate-source voltage is increased, the substrate depletion region expands and the reverse bias junction capacitance falls, thus reducing the gate-source capacitance and increasing the conduction speed. This makes it a suitable component for high-speed switching applications.When the gate voltage is decreased, the substrate depletion region shrinks and the reverse bias junction capacitance increases, thus increasing the gate-source capacitance and lowering the conduction speed. This makes it a suitable component for low speed digital circuits.

Conclusion

The STF8N65M5 is a highly reliable N-channel vertical DMOS FET that has been designed to operate in the very high frequency range. It is capable of handling voltages up to 500V, making it suitable for a wide range of applications such as switching power supplies, motor control, automotive device control, and audio amplification. It has a very low on-resistance and its fast switching speed makes it ideal for high frequency switching applications.

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