QTT1223ST1 Isolators

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Optoisolators are electrical components whose primary purpose is to isolate and protect circuit designs from electrical noise, develop a high-gain voltage level-shifting between two circuits, or prevent electrical transients due to high voltage spikes from damaging or corrupting connected circuits. The device is composed of an LED on one side that is optically coupled to a semiconductor device on the other side. QTT1223ST1 is an optoisolator with triac and SCR outputs.

QTT1223ST1 Characteristics

The QTT1223ST1 is a 5. Torr (17.5Kpa) rated device that is able to withstand high-voltage spikes up to 2800Vrms. It has a high insulation breakdown voltage of 3000Vrms between input and output pin. The device has an minifast terminal type for both input and output pins, providing a compact package size of 9.6mm x 4.6mm x 2.8mm.

The device features a LED chip made from AlGaAs material with luminous intensity of If max value of 5mA at Ivf = 20mA. The switching speed of the QTT1223ST1 is fast, it turn on in 1.0 msec, and off in 2.5 msec. It comes with a wide operating temperature range from -40°C to +85°C.

QTT1223ST1 Application Field and Working Principle

The QTT1223ST1 optoisolator triac and SCR output is suitable for use in a variety of applications for insulation, voltage-level shifting, and electrical noise protection. It is most commonly used in industrial and household automation, electrical circuits, automotive systems, building access control systems, medical equipment, security systems, measuring instruments, and industrial communication systems.

The optoisolator feature a triac or SCR connected in series with an LED. When the LED is powered, it produces an optical output. This optical signal activates the SCR or triac, opening the circuit and allowing current to flow through the device. The LED and triac/SCR remain in this state until the voltage supply is cut, at which time the LED and the triac/SCR switch off.

The output of the optoisolator may be triggered either through an electrical source, such as a circuit board, or through an optical source, such as a phototransistor. The optoisolators can also be used to switch AC/DC power from a remote source, such as a DC power supply or a relay.

The isolation in the optoisolator acts to prevent electrical transients due to high voltage spikes from reaching and damaging or corrupting the other connected circuits. This protective feature ensures that the connected circuit remains safe from any potential electrical interference. In addition, the insulation between the input and output pin also serves to block high-frequency noise that may be generated by the electrical circuit.

The QTT1223ST1 has a relatively fast switching speed, helping to minimize the voltage drop that can occur when the circuit is switched on or off. It also features a high breakdown voltage rating, helping to protect the circuit from potential over voltage damage. This combination of features makes the QTT1223ST1 an ideal solution for a variety of insulation, voltage-level shifting, and electrical noise protection applications.

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