I need to replace a crystal component (16.257 MHz, one of its legs broke off and cannot solder it back on) from an old video card that is wired up like the schematic below (the resistor / capacitor / frequency values differ, it's just for reference on how it is connected) :
Now I read that there is such a thing as a series-resonant oscillator and a parallel-resonant oscillator, but I don't know under what category this falls. However given the schema above, I would like to find a drop-in replacement.
When I search for a replacement part on Mouser, by providing the frequency:
I noticed that some of them say "load capacitance = 20 pF" others say "load capacitance = series".
I also noticed different form factors. The ones listed here all have a very low form factor,
while my broken component had a larger profile:
What kind of replacement could I choose? Does the housing (form factor matter) matter, and what about the load capacitance difference or other properties I should be aware of?
Best Answer
You should use the larger profile case (HC-49) because it is more tolerant of overdriving. If you can't get it, you can use the smaller HC-49/U or HC-49/US, but pick the one with the lowest ESR. The allowable drive level is about half.
For a video card, probably any of them will work. I would pick something with a 15-20pF load capacitance.