Series:	--
Packaging:	Bulk
Part Status:	Discontinued at Digi-Key
Triac Type:	Alternistor - Snubberless
Voltage - Off State:	1kV
Current - On State (It (RMS)) (Max):	25A
Voltage - Gate Trigger (Vgt) (Max):	1.3V
Current - Non Rep. Surge 50, 60Hz (Itsm):	208A, 250A
Current - Gate Trigger (Igt) (Max):	80mA
Current - Hold (Ih) (Max):	100mA
Configuration:	Single
Operating Temperature:	-40°C ~ 125°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-220-3
Supplier Device Package:	TO-220 Non-Isolated Tab

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Thyristors – TRIACs

Introduction

A thyristor is an electronically controlled power switch, a traditional semiconductor device used in switching and controlling electrical power. Thyristors are two-terminal devices with either three or four layers of semiconductor materials, with alternating p-type and n-type layers, designed in such a way that they switch on when the gate current is sufficient to trigger the junction. These devices are also called thyristor switches, triacs and SCRs (silicon-controlled rectifiers). A TRIAC is a bidirectional, three-terminal thyristor, which has both an ‘on/off’ switch and a variable linear control. The three terminals are labelled ‘Gate,’ ‘MT1’ and ‘MT2’. The difference between a TRIAC and other thyristors is that it is bidirectional and can control alternating current.This article will discuss the QK025R6 application field and its working principle.

QK025R6 Application Field

The QK025R6 is a medium power, 100V RMS, 3-terminal Silicon Controlled Rectifier (SCR) suitable for applications up to 70A RMS power control. It is designed for applications how require reverse voltage capability and a ruggedized design and is suitable for industrial, telecom, telecoms, data and power applications.This device is designed for use in applications such as motor control, AC power controllers, AC or DC motor speed or current control, power controls and protection. It can also be used in various power conditioning applications such as AC/DC, DC/DC and DC/AC converters.

QK025R6 Working Principle

The QK025R6 is a three-terminal device with an anode, cathode and control gate. Its structure consists of three-layer p-n-p-n-p material. When the voltage between the anode and the gate is sufficient, it will switch to a conducting state. In addition, the QK025R6 has a unique insight for controlling the gate current which helps reduce the power dissipation in the switch.When the anode is at a higher potential than the control gate, the switch is off. When the gate voltage is greater than the anode voltage, then the switch is turned on. The control current flowing through the gate determines the current flowing through the anode-cathode path. This control current can be controlled using the gate voltage.When the anode is at a higher potential than the cathode, the switch is off, but when the anode is at a lower potential than the cathode, the switch is on. The control gate current is not necessary for this turn-on operation, but it is important for controlling the anode current.

Conclusion

The QK025R6 is a medium power, 100V RMS, 3-terminal Silicon Controlled Rectifier that is suitable for applications up to 70A RMS power control. It is designed for applications that require reverse voltage capability and a ruggedized design and is suitable for industrial, telecom, telecoms, data and power applications. The QK025R6 works by switching to a conducting state when the voltage between the anode and the gate is sufficient. It also has a unique insight for controlling the gate current which helps reduce the power dissipation in the switch. The switch is turned on when the gate voltage is greater than the anode voltage, and off when the anode is at a higher potential than the cathode.

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