B551-2T

Series:	--
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Structure:	1-Phase Controller - All SCRs
Number of SCRs, Diodes:	2 SCRs
Voltage - Off State:	400V
Voltage - Gate Trigger (Vgt) (Max):	2.5V
Current - Gate Trigger (Igt) (Max):	60mA
Current - Non Rep. Surge 50, 60Hz (Itsm):	250A @ 60Hz
Operating Temperature:	-40°C ~ 125°C (TJ)
Mounting Type:	Chassis Mount
Package / Case:	Module

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B551-2T Application Field and Working Principle

Thyristors, also known as silicon-controlled rectifiers (SCRs), are solid-state electronic devices used to control and regulate electrical power. Due to their low cost, small size, and low maintenance, thyristors are one of the most widely used components in the electronics industry. The B551-2T is a particularly versatile thyristor die, offering various application fields and various operational principles.

Application Field

The B551-2T is a versatile thyristor die, which has a wide range of applications. The B551-2T can be used for phase control of AC loads, phase angle firing of SCRs, motor speed control, and other light-load switching duties. In addition, the B551-2T can also be used for AC motor starting, DC motor starting, power factor improvement, and flicker-free dimming of lighting fixtures.

Working Principle

The B551-2T is a three-terminal device with two main components: the control gate and the main terminal. The control gate is used to trigger the thyristor by applying a small voltage or current to the gate. When the gate receives the correct voltage (or current) level, the main terminal will switch to the on state, which allows current to flow through it. When the gate voltage (or current) is removed, the main terminal will switch to the off state, which means that current will cease to flow through it.The B551-2T can operate in two different modes: current mode or voltage mode. In current mode, a small current is applied to the gate, which triggers the main terminal to switch on. In voltage mode, a small voltage is applied to the gate, which triggers the main terminal to switch on. The B551-2T is also capable of reverse conducting, meaning that it can switch off when the gate voltage (or current) is lower than the threshold level.

Conclusion

The B551-2T is a versatile thyristor die which offers a wide range of applications and operational principles. The B551-2T has a variety of uses, such as phase control of AC loads, phase angle firing of SCRs, motor speed control, and light load switching duties. It can also be used for AC motor starting, DC motor starting, power factor improvement, and flicker-free dimming of lighting fixtures. The B551-2T is capable of operating in current or voltage mode and is also able to reverse conduct.

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