MCR708AT4

Current - Hold (Ih) (Max):	5mA
Base Part Number:	MCR708A
Supplier Device Package:	DPAK
Package / Case:	TO-252-3, DPak (2 Leads + Tab), SC-63
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 110°C
SCR Type:	Sensitive Gate
Current - Non Rep. Surge 50, 60Hz (Itsm):	25A @ 60Hz
Current - Off State (Max):	10µA
Series:	--
Current - On State (It (RMS)) (Max):	4A
Current - On State (It (AV)) (Max):	1.6A
Voltage - On State (Vtm) (Max):	2.2V
Current - Gate Trigger (Igt) (Max):	75µA
Voltage - Gate Trigger (Vgt) (Max):	800mV
Voltage - Off State:	600V
Part Status:	Obsolete
Packaging:	Cut Tape (CT)

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Thyristors - SCRs: MCR708AT4 application field and working principle

Thyristors are a type of semiconductor that are predominantly used for switching and controlling high-power applications. Thyristors are commonly divided into four general categories: silicon-controlled rectifiers (SCRs), gate turnoff thyristors (GTOs), thyristor-controlled rectifiers (TCRs), and diacs. This article will focus on SCRs, and particularly on the MCR708AT4 model, its application field and working principle.MCR708AT4 SCR is a four quadrant isolated gate analog-triac-controlled thyristor. An MCR708AT4 is a discrete type of SCR, meaning it is built as a single device rather than as part of an integrated circuit. An MCR708AT4 is a type of fast-switching thyristor used in many industrial applications, such as adjustable output current circuits, line voltage regulators, starter motors, and AC power control circuits.The MCR708AT4 SCR offers several key features such as an isolated gate, an analog-controlled triac, a low conduction angle shift, a low crowbar voltage, a high speed turn-on, a high current carrying capacity, low forward voltage drop, and fast switching speed. It also has a very low on-state voltage drop, up to 1 mOhm, and a high commutation capability, up to 1.2 kHz under a moderate load.The working principle of an SCR involves a three-layer semiconductor junction consisting of a P-type layer, an N-type layer, and a Gate layer. In the off-state, the P-layer and the N-layer form a PN junction, meaning that electrons can only move in one direction (negative to positive). When the Gate layer is forward-biased, allowing a current to flow, the resulting current in the N-layer triggers the release of electrons, allowing them to flow in both directions across the PN junction, thus allowing the SCR to conduct. The application field of the MCR708AT4 includes variable speed drives, resistive heating, solid-state relays, industrial motor control, capacitative circuits, and voltage regulation. It is commonly used for motor speed control, motor control, lighting dimmers, and temperature control.The MCR708AT4 is designed to run with AC voltages of up to 400V, and can reach a continuous current of 2A. It is highly reliable and efficient, and provides a very low on-state voltage drop even when switching large loads.The MCR708AT4 also has a low Crowbar voltage and can withstand high temperatures (up to 150°C). It is also RoHS (Restriction of Hazardous Substances) compliant, meaning that it does not contain toxic materials such as lead or mercury.In conclusion, the MCR708AT4 SCR is a highly reliable and efficient four quadrant isolated gate analog-triac-controlled thyristor offering various important features and benefits. It is commonly used for many industrial applications, such as adjustable output current circuits, line voltage regulators, starter motors, and AC power control circuits. It is RoHS compliant, and is capable of achieving a very low on-state voltage drop, even under heavy load conditions.

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