Q4025J681

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Triac Type:	Alternistor - Snubberless
Voltage - Off State:	400V
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-218X-3 (Isolated)
Supplier Device Package:	TO-218X Isolated

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Thyristors - TRIACs: Q4025J681 Application Field and Working PrincipleThyristors are electronic switching devices with three electrodes containing a semiconductor material. They are commonly referred to as thyristor family components. The thyristor family includes SCRs, DIACs, TRIACs, and other similar devices. The Q4025J681 is a TRIAC device, a type of thyristor specifically designed for use in a variety of applications.A TRIAC is a three-terminal semiconductor device which can control current in either direction when triggered by a control signal at its gate terminal. When the control voltage applied to the Gate is sufficient, the TRIAC is activated and allows current to flow in both directions, enabling synchronized control of AC or pulsed current. The Q4025J681 is a high power TRIAC device rated for 25 Amps alternating or pulsed current with a peak off-state voltage of 600V and an on-state voltage of 600V.Q4025J681 TRIACs can be used in a number of industrial applications, including as a switch for lighting, heating, air conditioning, motor speed control, and many more. For example, it can be used as a lighting dimmer, where the control signal to the Gate terminal modulates the brightness of the light emitting from a lamp. This device is also particularly suited to powering DC motors, as different pulse widths can be applied to the Gate in order to adjust the speed of the motor accordingly.The working principle of the Q4025J681 is simple. When the control voltage is applied to the Gate terminal, the TRIAC is activated, allowing current to flow in both directions across both main terminals (MT1 and MT2). This causes the main current to increase, producing a voltage drop across the TRIAC and thereby reducing the voltage across the Gate. This reduces the Gate current and prevents the TRIAC from conducting excessive current. As a result, the current supplied to the circuit is regulated to the programmed value. Conversely, when the Gate voltage is removed, the TRIAC ceases to conduct current and is said to “fire”.In conclusion, the Q4025J681 TRIAC is a robust and powerful device that allows for the control of current in either direction. It is primarily used in industrial applications, such as as a lighting dimmer or DC motor speed control. Its working principle is based on triggering the multi-terminal device with a control voltage sufficient to activate the TRIAC and simultaneously regulate the current passing through it.

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