Q8025L6

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Thyristors - TRIACs

Thyristors are a type of three terminal semiconductor devices used in the control and regulation of electric power. Additionally, they can also be used as switches, amplifiers, and signal processing applications. TRIACs, also known as Triode Alternating Current devices or Versatile Interface Controllers (VICs), are a type of Thyristor that can handle higher current levels, and are designed to switch high levels of AC voltage and current. Of these, the Q8025L6 TRIAC is an encapsulated discrete bidirectional device in a TO-92 package.

Q8025L6 Application Field

The Q8025L6 is most often used for general purpose AC switching applications, such as controlling light dimmers, relays, motors, and other AC power loads. The device is typically used in automotive, avionic, medical, and industrial control systems.

Q8025L6 Working Principle

The Q8025L6 operates by sensing an input trigger voltage and then turning on to conduct current in both directions when the minimum gate current is exceeded. This is known as the "quadrant" mode and refers to both positive and negative voltage conditions. The device is rated to handle a wide range of voltages, depending on the package, and is available in packages ranging from TO-92 through TO-261 in various ratings.

The basic operating principle of the Q8025L6 follows a two-stage current flow, which is made up of the forward conduction stage and the reverse conduction stage. This two-stage process is as follows: when the device is triggered on and the total instantaneous current Iτ reaches its holding current, the forward current flow is established by the principle of forced commutation, which happens when the anode current is greater than the rated current limit. As soon as the voltage reaches the maximum VTM of the device, the reverse current flow is enabled to reduce the total current in the circuit. This process is repeated until the electrical load is completely controlled.

Q8025L6 Parameters

The parameters of the Q8025L6 are as follows:

• Voltage ratings: 0V - 400V.
• Current ratings: 0.1A - 8A.
• Operating temperature range: -40C to +85C.
• Package styles: available in TO-92, TO-220 and TO-241.
• Gate trigger current: 2mA.
• On-state resistance: 0.15 Ohm.
• Off-state blocking voltage: 500V.

Conclusion

The Q8025L6 TRIAC is used for a wide range of AC switching applications and its working principle is based on the two-stage conduction of current flow. The device is specially designed for larger current handling capacity, and is available in various package forms depending on the manufacturer. The device is frequently used in various industries, such as automotive, avionic, medical, and industrial control systems.

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