The S842 is a bi-directional, single-pole, single-throw, normally open multipurpose relay. The circuit is composed of one LED on the input side which activates an optically coupled IC on the output-controlling the firing angle of two back-to-back SCRs.

The S106-X is a bi-directional, single-pole, single-throw, normally open multipurpose relay. The circuit is composed of one LED on the input side which activates an optically coupled IC on the output-controlling the firing angle of two back-to-back SCRs.

The purpose of current limiting is to prevent any transient current spikes or fault conditions from damaging the relay and any circuit components "downstream" from the relay. Current limiting technology has been designed into a variety of SSO relay components. This application note is designed to provide insight into the technology of current limiting and how it can be utilized for certain applications.

In a relay's most basic function, the switching of a load circuit is controlled by a low power, electrically isolated input signal. In the past, Electromechanical Relays (EMRs) have been the component of choice, largely due to price, function, and availability. Now, however, the emergence of semiconductor technology has provided the means to manufacture solid state relays (SSRs) which in many applications, outperform their predecessors.

The AD6C211-L is a bi-directional, double-pole, single-throw, normally open multipurpose solid-state relay. It is designed to replace electromechanical relays in general purpose switching applications. The relay consists two integrated circuits, each driving a pair of rugged source-to-source enhancement type DMOS transistors-optically coupled to a light emitting diode.

The TR115 is a dual function circuit designed specifically as a telecommunications switch. It consists an optically isolated solid state relay and an optically isolated optocoupler combined in a compact 8pin DIP package. The relay portion is composed of an LED on the input, optically coupled to a sensing circuit which drives two source-to-source DMOS transistors. The optocoupler portion of the package consists of two-to-back LEDs that drive an output phototransistor.

The AD4C113 is composed of two isolated relay; one normally open and one normally closed. Each relay has a bi-directional, single-pole, single-throw contact.

The SDT600 consists of a phototransistor optically coupled to a light emitting diode. Optical coupling between the input LED and output phototransistor allows for high isolation levels while maintaining low-level DC signal control capability.

The S842-X is a bi-directional, single-pole, single-throw, normally open multipurpose relay. The circuit is composed of one LED on the input side which activates an optically coupled IC on the output-controlling the firing angle of two back-to-back SCRs.

The S107 is a bi-directional, single-pole, single-throw, normally open multipurpose relay. The circuit is composed of one LED on the input side which activates an optically coupled IC on the output-controlling the firing angle of two back-to-back SCRs.