A quartz crystal is a component used in the field of digital electronics to generate a clock pulse used for timing in digital circuits. The crystal is usually an externally connected component and part of a crystal oscillator circuit. They are extremely popular in watches and clocks due to their high accuracy and low drift.
Here are some standard quartz crystal values available in a HC-49/U package. The HC-49/U series of quartz crystal will typically require a load capacitance between 8 pF to 32 pF, and a shunt capacitance of 7 pF maximum. The drive level tends to be around 1 mW maximum. This type of package has become an industrial standard, made from “AT-Cut” crystal to precise specifications. A newer version of this package known as HC-49/US has a smaller profile and provides additional values.
|Frequency (MHz)||Load Capacitance (pF)|
Here is a very useful chart showing the crystal frequency and the typical load capacitance required. Back when I was a young lad, I could recall all the values from memory. The following standard values of crystals are currently available in a HC-49/U package.
- Time base of an oscilloscope
- Quartz Clock
- Quartz Watch
- ZX80 Kit
- ZX81 Kit
- Microcontroller IC
- RF Oscillators
This Article Continues...Standard Quartz Crystal Values HC-49/U
6.5 MHz Quartz Crystal
Crystal Electronic Symbol & Basics