ECS-3953M-400-B
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21732031-ECS-3953M-400-B
Oscillator XO 40MHz ±50ppm 15pF HCMOS 60% 3.3V 4-Pin CSMD
a count of all of the component leads (or pins)
RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.