Today, I came on a PC board and the silkscreen marking have TG on it. What is the component for TG?
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1\$\begingroup\$ Do you have a photo? That's not a very common one. Are you sure it's a designator and not the PCB material spec? \$\endgroup\$– Spehro 'speff' PefhanyCommented Jan 12, 2023 at 21:24
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\$\begingroup\$ Is the TG marking followed by a number? Possibly a European designation for a Gas Discharge Tube (GT vs. TG). If used alone it might even designate that the PCB is made of a high temperature material, (The TG specification for a PCB is related to the "glass transition temperature" of the actual PCB material.) \$\endgroup\$– NeddCommented Jan 14, 2023 at 11:35
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\$\begingroup\$ More insight here: electronics.stackexchange.com/questions/718772/… \$\endgroup\$– Tim WilliamsCommented Jul 8 at 19:54
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1 Answer
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No one checks designators, there's no like universal regulatory process or anything -- at most, in-house standards apply, or only what is dictated by contract terms. There are standards, such as ANSI-Y32.2 (1975), but "TG" is not among them.
So, it could mean anything.
The component in question appears to be a multilayer or ceramic component: ferrite bead, thermistor, MOV, etc.. Ferrite bead wouldn't make much sense in parallel with a relatively large resistor, and MOV maybe. A thermistor, for sensing ambient temperature on the board, beside perhaps a comparator to set a threshold, is a definite possibility.
We can't know for sure without tracing the surrounding circuit, knowing what the other components are, connectors, etc.
answered Jul 8 at 15:37