Barbra

What's the difference between MC14046B and CD4046?

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Recently I use a monolithic phase locked loop IC MC14046B to design a high frequency drive circuit. 
When I use CD4046A, it can not work, I would like to ask that do the two pin have the same function of the circuit? what is the difference?
 

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About 53 years ago the CD4046A was introduced but it had many problems. It was replaced a few years later by the improved CD4046B and MC4046B and HEF4046B.

Your CD4046A must be one of the very old ones with problems.

Look on the datasheets of an A and of a B to see the differences.

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