Guest
Sat May 21, 2005 7:20 pm
Just a very basic question:
Can anyone share with me what's the benefit of using transistor as an
electrical relay compared to mechanical relay when the incoming signal
is from a computer?
Is it related to pricing, input voltage/current, power rating and etc?
Pls help.
Thanks.
Albert
Jerry G.
Guest
Sat May 21, 2005 8:13 pm
Both mechanical relays, and solid state relays both have their
particular characteristics. They both have their particular
requirements, and may not necessarily be directly able to be
substituted for each other.
Solid state relays however, are extremely fast switching with their
speed of response. The circuit design for one or the other, has to be
specific.
Most any transistor can work as a switch. There are however,
transistors that are designed specificaly for swithing applications.
Most of the time, solid state relays are opticaly isolated. There are
however some types that do not use optical design for their isolation.
There are also some types that may not be isolated for various reasons.
Web page from a distributor for solid state relays:
http://www.vishay.com/solid-state-relays/
Examples of spec sheets:
http://relays.tycoelectronics.com/datasheets.asp
Jerry G.
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