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Solid State Relays Overview and Applications

 

 
The SSR that NEC has started marketing uses a photocoupler system with a MOS FET, explained in the following, as an output switch and a combination of an Emitter and Photo Detector to drive the switch. NEC's SSR is named a 'OCMOS FET (Opto-Coupled MOS FET)” as the input and output are isolated with a photocoupler and the MOS FET switch is used as an output switch. The OCMOS FET using a photo Detector to drive the MOS FET is a new type of SSR developed recently and being commercialized. An OCMOS FET operates this way: A control signal applied to the OCMOS FET input terminals triggers the output switch of the OCMOS FET, which, in turn, opens or closes the output terminals. A normally-off type (which is functionally the same as a 'make contact” mechanical relay) leaves the output terminals open, if there is no input signal, and short-circuits the output terminals if an input signal above the threshold level is applied. Conversely, a normally-on type (which is functionally the same as a 'break contact” mechanical relay) keeps the output terminals short-circuited, if there is no input signal, and opens the output terminals by an input signal.
Products & Services
CompactPCI switches and PXI switches are used in industrial systems to connect test points or devices to instruments for the purpose of testing, measuring or monitoring the system. Search by Specification | Learn more about CompactPCI Switches and PXI Switches
Transistors are electronic devices made of semiconductor material that amplify a signal or open or close a circuit. Search by Specification | Learn more about Transistors
Solid state relays (SSR) or semiconductor relays are semiconductor devices that can be used in place of mechanical relays to switch electricity to a load in many applications. Search by Specification | Learn more about Solid State Relays
VME, VPX and VXI switches are used to connect test points or devices to instruments for testing, measuring, or monitoring. They provide a variety of switching and routing functions for test systems based upon the VME, VPX, and VXI standards. Search by Specification | Learn more about VME, VPX and VXI Switches
Relay boards (multiple relay modules) are computer boards with an array of relays and switches. They have input and output terminals and are designed to control the voltage supply. Learn more about Relay Boards (Multiple Relay Modules)
Product Announcements
California Eastern Laboratories - CEL - PS2501A DIP Photocoupler
PS2501A-1 and PS2501AL-1 are 5,000V Optocouplers with phototransistor output, in a plastic DIP (Dual In-line Package) with PS2501AL-1 in a lead-bending type (Gull-wing) for surface mount. PS2501AL1-1... (read more)
California Eastern Laboratories - CEL - PS2701A SOP4 Photocoupler
PS2701A-1 is a 3,750V SOP4 SMT package Optocoupler with phototransistor output. This SOP (Small Outline Package) type and has an internal shield to reduce noise and improve performance, and is... (read more)
California Eastern Laboratories - CEL - PS2561A DIP Photocoupler
PS2561A-1 is a 5,000V Optocoupler with phototransistor output, in a plastic DIP (Dual In-line Package) with PS2561AL-1 in lead bending type (Gull-wing) for surface mount. (read more)
American Microsemiconductor, Inc. - Junction Field Effect Transistor J-FET from AMS
The J-FET (Junction Field Effect Transistor) is a voltage controlled device: that is a small change in input voltage causes a large change in output current. (read more)
California Eastern Laboratories - CEL - PS2502 DIP4 Darlington Photocoupler
PS2502 is a DIP4 5,000V isolation optocoupler with an NPN silicon darlington phototransistor. The PS2502-1, -4 are in a plastic DIP (Dual In-line Package) and the PS2502L-1, -4 are lead bending type... (read more)
 
Topics of Interest
14-6. DETECTOR CIRCUITS   So far, we have considered only the simple detector circuits shown in Fig. 14-2, in which the output is taken as the voltage across the series load resistor RL. Here, we... (Read More)
7.7 Active FET Mixers FETs are widely used in MMIC mixers, as many monolithic foundry processes are based on the MESFET structure. Consequently, FET mixers can be fabricated on the same chip with... (Read More)
3.1 Introduction This chapter explains the advantages of using an FGMOS device over a standard MOS transistor in circuits which require low power and low voltage operation. The first section... (Read More)
M/A-COM's Microelectronics Division produces a silicon CMOS Application Specific Integrated Circuit (ASIC) that drives GaAs Field Effect Transistor (FET) based switches or digital attenuators from a... (Read More)
4.8 Other Applications of the Log Domain Filtering Idea Now we have seen how log domain filters work and how they can be designed and understood. The design context has been solely that of bipolar... (Read More)
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