A pack of 4 Surface Mount 16MHz Ceramic Resonators
Ceramic Resonators are used like Crystal Oscillators with built in capacitors. They are a three terminal device, the center terminal (pad) is for the ground, the left and right are the two crystal, err, poles, is that the right word, I guess.
This is an extremely miniature device, very often used on Arduino Nanos, Pro-Minis, Micros and that sort of thing where space is at a premium.
The exact part number on these I think is probably CSTCE16M0V54-R0 but could be CSTCE16M0V53-R0 or CSTCE16M0V55-R0 the only difference is about 10-15pF of capacitance and I can’t reliably measure with that precision to confirm.
I have used this part (well, not THIS part, the one I’m selling you is brand new, but you know what I mean) to make ATMega328 powered things and they suit that job just fine.
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