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| Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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16th May 2009, 12:47 pm
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#1 |
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Nonode
Join Date: Jun 2004
Location: Norwich, Norfolk, UK.
Posts: 2,543
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Transistor identification
Hi, Can anybody identify the transistor in the attached photo? I've Googled the numbers, but come up with nothing
 .David |
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16th May 2009, 3:30 pm
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#2 |
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Nonode
Join Date: Jun 2004
Location: Norwich, Norfolk, UK.
Posts: 2,543
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Re: Transistor identification
Ok I think I've identified it myself. If I assume that the first digit is a Q and not 0 then I have an Q4004f42 which Google reveals as an 400V 4A triac, made by Teccor with a TO-202 case
 . Unfortunately it's obsolete, so can I use any triac with the same, or higher, voltage and current value... or is it more complicated than that? David |
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16th May 2009, 3:43 pm
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#3 |
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Rest in Peace
Join Date: Dec 2008
Location: Burton upon Trent, East Staffordshire, UK.
Posts: 1,686
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Re: Transistor identification
david,
That's a very astute piece of lateral thinking Is it plausible for it to be a triac in the circuit? If, so, anything not too far out (above) should be OK. Alan |
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16th May 2009, 4:41 pm
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#4 |
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Nonode
Join Date: Jun 2004
Location: Norwich, Norfolk, UK.
Posts: 2,543
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Re: Transistor identification
Hi Alan,
Yes I think it's very likely to be a triac. It's from a motor variable speed controller that's stuck at one speed David |
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16th May 2009, 9:00 pm
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#5 |
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Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,536
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Re: Transistor identification
Surely the MEX just means made in Mexico, E4 is probably a batch code.
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