PSA: Good Source for Premium TC1044 & ICL7660 for audio

[andrewsrea]

I've been on forum for almost a year and noticed almost monthly, someone posts that their build which uses a charge pump has an audible whine. Which means, the pump frequency and its 1st order subharmonic is in the audio range (typically 10Khz, with a 5Khz subharmonic with pin #1 engaged in boost mode). I bought some recently on Amazon which were supposed to be the 45Khz and were not.

Mouser has both TC1044SCPA and ICL7660SIPAZ, which are both 45Khz with a 22.5Khz subharmonic, that is not audible. I bought and tested 5 of each. Their specs are identical and they do the job with no artifacts. Part numbers are 579-TC1044SCPA and 968-ICL7660SIPAZ. I paid $6.55 for (5) 1044 and $9.35 for (5) 7660, plus $7/99 shipping. Now that I have tested, I'll go with the less expensive TC1044SCPA next time and save a few pennies.

 

[darwin999]

@andrewsrea - thanks for relaying your test results! And Mouser is such a great supplier. I'll add that if you register w/ Mouser, there's a low cost $4.95 economy shipping offer if you look for it, which I find takes ≤3 days to get to my home in NJ.