What's the difference between MC14046B and CD4046?

[Barbra]

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?
 

 

[audioguru2]

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.

 

[admin2]

According to datasheet MC14046B is compatible with CD4046B and they don't mention about CD4046A

 

[audioguru2]

www.datasheetarchive.com has the datasheets from two manufactures of the very old CD4046A. Of course they also have the datasheets of the improved CD4046B, MC14046B and HEF4046B.