LAA125LS

Series:	LAA, OptoMOS®
Packaging:	Tube
Part Status:	Active
Mounting Type:	Surface Mount
Circuit:	SPST-NO (1 Form A) x 2
Output Type:	AC, DC
Voltage - Input:	1.2VDC
Voltage - Load:	0V ~ 350V
Load Current:	150mA
On-State Resistance (Max):	18 Ohms
Termination Style:	Gull Wing
Package / Case:	8-SMD (0.300", 7.62mm)
Supplier Device Package:	8-SMD

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Introduction

The LAA125LS Solid State Relay (SSR) is a “complete” system composed of a thyristor (or triac) coupled with a zero crossing detector and heat sink. It is often used in larger industrial systems where accurate control and reliable switching is needed. The use of a SSR can be beneficial to a system as it eliminates arcing and the need for contact maintenance. This article will focus on the application field and working principle of the LAA125LS.

Application Field

The LAA125LS is a high power SSR designed for use with high power AC loads. It is suitable for applications from 1 to 400 Amps AC. Common applications for the LAA125LS include power conversion, machine tools, electronic dimensional control systems, and heavy duty industrial machinery. The LAA125LS has no switching time delay and can effectively switch with no arcing.

Working Principle

The LAA125LS is comprised of a zero-crossing detector (ZCD) and a triac or thyristor which acts as a switch. At the start of each half cycle of the AC power, the ZCD detects zero-cross conditions and switches the device’s on/off control pin accordingly. When the control pin is low, the triac stays off and no current passes through the device. When the control pin is high, the triac turns on and current passes through the device.The LAA125LS also contains a heatsink which helps to dissipate heat. As the device is operating, the heat generated by the triac will be dissipated by the heatsink ensuring that the device does not overheat.

Conclusion

The LAA125LS is a reliable and efficient Solid State Relay designed specifically for high power AC loads. It is capable of switching quickly and accurately with no arcing and has a heatsink to dissipate heat. The LAA125LS is widely used in larger industrial systems where accurate control and reliable switching is needed.

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