OT391,412

Series:	--
Packaging:	Bulk
Part Status:	Discontinued at Digi-Key
Triac Type:	Standard
Current - Non Rep. Surge 50, 60Hz (Itsm):	--
Configuration:	Single
Operating Temperature:	--
Mounting Type:	Through Hole
Package / Case:	TO-226-3, TO-92-3 (TO-226AA)
Supplier Device Package:	TO-92-3

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OT391,412：Thyristors - TRIACs

Thyristors, more often referred to as TRIACs, are an important class of semiconductor devices used in various applications such as AC speed control, lighting control and AC motor control. The OT391,412 are two popular models of TRIACs.

What Are Thyristors?

Thyristors are three-terminal semiconductor switching devices made of materials such as silicon, germanium and selenium. They are two-terminal devices connected in opposite directions, so that when one is triggered to become on, the other also turns on. Thyristors are highly efficient for controlling the amount of current and the level of voltage. They require a small amount of power to switch between on and off states and can maintain a consistent current through the device once it is in the ‘on’ state.

What Are OT391,412?

OT391 and OT412 are two of the most popular models of TRIACs, a specific kind of thyristor. The OT391 is a medium power, low leakage TRIAC, with a maximum rating of 10A at 600V. It is suitable for applications where low leakage is required, such as motor starters and industrial applications. The OT412 is a medium power, high-voltage TRIAC, with a maximum rating of 12A at 1200V. It is suitable for applications where high voltage is required, such as AC motor control, adjustable speed drives and light dimming.

Working Principle

The OT391 and OT412 both work on the basic principles of thyristors. When a voltage is applied to the gate terminal of the device, it triggers the thyristor to switch on and allow current to flow from the main leads. When the current is removed from the gate terminal, the thyristor switches off and the current stops flowing. The thyristor can be triggered multiple times during the same period and can switch on and off within a few microseconds. This makes them highly suitable for applications such as AC motor control and light dimming, where precise on and off timing is required.

Application Fields

The OT391 and OT412 can be used in many application fields, including:

• AC motor control
• Light dimming
• Speed control
• Industrial applications
• Motor starters
• Adjustable speed drives

The OT391 and OT412 are versatile devices that can be used in a wide range of applications. They can provide precise control of current and voltage, making them highly suitable for use in a variety of industrial, commercial and residential applications.

Conclusion

The OT391 and OT412 are two of the most popular models of TRIACs, a type of thyristor. They are highly reliable, low leakage devices that can be used in many applications, such as AC motor control, light dimming, speed control, motor starters and adjustable speed drives. They work on the basic principles of thyristors, whereby a voltage applied to the gate terminal will trigger the device to switch on and allow current to flow. The OT391 and OT412 are highly efficient and versatile devices that can provide precise control of current and voltage, making them suitable for use in a variety of applications.

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