Introduction: With the rapid advancement of electronic technology, the previously used 2-pin DIP plug-in crystal oscillator was gradually replaced by a small, lightweight patch crystal. Previously known plug-in crystal oscillator, generally only two welding feet, there is no doubt in the welding, but the patch crystal is different, the patch crystal has passive and active points, the foot has 2 feet and 4 feet. Here we summarize the issues in this area:
a) The 2-pin patch crystal must be a passive crystal.
b) The 4-pin patch crystal may be either a passive crystal oscillator or an active crystal oscillator.
c), more than four feet of the patch crystal oscillator must be active crystal
d) The active crystal oscillator will be marked with the pin position. There is usually a point in the lower left corner.
e), The common 4-pin SMD crystal package has 1.6*1.2mm, 2.0*1.6mm, 2.5*2.0mm, 3.2*2.5mm, 5.0*3.2mm, 6.0*3.5mm, 5.0*7.0mm
f), 2-pin passive patch crystal oscillator is usually the number of common ceramic surface, the metal surface is only 49SMD and Mini 49SMD, but generally speaking, most of the metal surface of the four-pin passive patch crystal-based.
When we use a patch crystal oscillator, we often encounter the following situation. The four-pin patch crystal does not know how to distinguish the pin position. In the case of a passive crystal oscillator, only two feet are the function pins and the other two pins are floating. They are used to connect to GND. Simply connect two 1# 3# pins on the diagonal, 2#. 4# grounding. How to locate these 4 feet under normal circumstances? Here to tell you a more common sense, 4 feet passive patch crystal, crystal manufacturers in order to make it more favorable for everyone to distinguish the foot, there is a foot will have a gap, as a 1 # foot, clockwise down 2,3,4#.
Source: Hengyi (Hong Kong) Enterprise Co., Ltd.
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