Standard Quartz Crystal Values HC-49/U

Quartz Crystal

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 A newer version of this package known as HC-49/US has a smaller profile and provides additional values.


HC-49/U Crystal
Frequency (MHz) Load Capacitance (pF)
1.8432 30
2 20
2.4576 30
3.2768 12
3.579545 20
3.6864 30
4 30
4.096 30
4.194304 12
4.608 30
4.9152 30
5 30
5.0688 0
6 30
6.144 30
6.5536 12
7.3728 30
8 30
9.8304 ?
10 30
11 30
11.0592 20
12 30
12.288 30
14.31818 0
14.7456 30
16 30
19.661 30
20 0
22.1184 30
24 0
32 0

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.


Application

  • Time base of an oscilloscope
  • Quartz Clock
  • Quartz Watch
  • ZX80 Kit
  • ZX81 Kit
  • Microcontroller IC
  • RF Oscillators

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Standard Quartz Crystal Values HC-49/U
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