TLP174GA(TP,F)

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Solid State Relays

Solid state relays or SSRs are electrical relays, whose contacts are switched on and off using semiconductor devices with no moving parts, so they are also called contacts without contacts. Unlike electromechanical relay, SSRs have no mechanical parts that can wear out or break down over time. Each SSR consists of an input control circuit and output circuit connected via an isolation process. They have numerous advantages such as long life, high speed, space savings, shock resistance, and environmental benefits in comparison with electromechanical relays. Solid state relays are widely used in a variety of applications such as DC-DC & AC-DC power conversion, motor control, instrument control, security systems, sound & temperature control, and telecommunications.

TLP174GA(TP,F) Application Field and Working Principle

TLP174GA(TP,F) is a bipolar AC solid state relay from Toshiba Semiconductor and Storage with a wide operating voltage range of 4.7 to 270V AC. It is a compact surface-mount, four-pin solid state relay package and can be through-hole mounted on a printed circuit board assembly. It is especially suited for applications such as home appliances, office automation, industrial machines, security systems, and lighting and motor control.

The TLP174GA(TP,F) is designed to switch electric devices using input control signals. It is composed of a photo-MOSFET, an infrared diode, and resistor network in one IC. The photomos is alternately switched ON and OFF by a light emitted from the infrared diode. The photo-MOSFET is then turned on and off with input control signals. After the control signal is removed, the photo-MOSFET will remain in the ON state until the input signal is received again.

The transition from OFF to ON state is done directly in the principle of semi-conduction. As such, it can attain a higher power density than that of electromechanical relays. Furthermore, the use of a driving circuit and zero-crossing method helps extend the lifetime of the photo-MOSFET, reduce noise, and prevent malfunction.

The TLP174GA(TP,F) also includes several options in terms of input control signals, contact forms, and mounting styles. Its four-pin slotted DIP, which is easy to use and well matched with modern PCB production processes, is well-suited for integrating SSRs into existing designs. Similarly, the thru-hole mounting style offers a direct connection to the drivers and other peripheral devices.

In conclusion, the TLP174GA(TP,F) is a versatile solid state relay with a range of features that make it suitable for various applications. It is capable of switching electric devices with input control signals at high speed and with high power density. Its housing options and characteristics provide users with plenty of choice when it comes to selecting an appropriate SSR.

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