Transistors Substitutions/Equivalents
- Thread starter hazim
- Start date
This page has a lot of transistor cross-reference links:
http://101science.com/transistor.htm#crossdb
Many links are dead or re-directed.
There is a trial version of a DOS-based semiconductor substitution program at the bottom of this page:
http://www.ee.washington.edu/circuit_archive/parts/
http://101science.com/transistor.htm#crossdb
Many links are dead or re-directed.
There is a trial version of a DOS-based semiconductor substitution program at the bottom of this page:
http://www.ee.washington.edu/circuit_archive/parts/
All the substitution books I have seen have been highly unreliable.
You are far better off understanding the specifications, particular those of particular interest to your application, and using a book or table of specs to find a proper substitute, or posting on sites like AAC for help choosing.
One particular problem is that many popular transistors are made in a variety of physical connection patterns. The substitute should also duplicate your particular pattern.
eg substituting a BC486 for a 2N4402 will fail on connection details, although electrically they are very similar.
substituting an MPSA55 would also fail because it is a much slower transistor (50Mhz against 150 Mhz)
I don't think subnstitution tables take these parameters into account
You are far better off understanding the specifications, particular those of particular interest to your application, and using a book or table of specs to find a proper substitute, or posting on sites like AAC for help choosing.
One particular problem is that many popular transistors are made in a variety of physical connection patterns. The substitute should also duplicate your particular pattern.
eg substituting a BC486 for a 2N4402 will fail on connection details, although electrically they are very similar.
substituting an MPSA55 would also fail because it is a much slower transistor (50Mhz against 150 Mhz)
I don't think subnstitution tables take these parameters into account
Most suppliers list at least the basic specs for their offerings. It is no good knowing you could substitute a BC109 for a BC 108 if you can't get either.
But you could look in a catalogue for a silicon NPN transistor with a voltage rating greater than 25 volts and a current capacity greater than 100 milliamps and a gain greater than 100 and the pinout sequence ebc and perhaps Ft greater than 100Mhz.
You would get several (many) candidates and could look on Google for more detailed specs to choose.
But you could look in a catalogue for a silicon NPN transistor with a voltage rating greater than 25 volts and a current capacity greater than 100 milliamps and a gain greater than 100 and the pinout sequence ebc and perhaps Ft greater than 100Mhz.
You would get several (many) candidates and could look on Google for more detailed specs to choose.
