Who manufactures the hearing aid chips?

Go to a library. There are books listing virtually any product or service you might want. I forget the name, but I think they're blue.

KG wrote in news: snipped-for-privacy@4ax.com:

they're probably custom designs,manufacturer-specific.

(Many links and useful articles)

Amazing what you can find with Google.

I did Google, and received about what you did but that does not begin to answer the question.

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Call On Semiconductor's Marketing department, and ask them. They're in that market; they should be in a position to know.

Do you have 600 Euros? You can download a hearing aid market report from these folks:

It lists the major players in the hearing aid industry. You could call them, and ask where they source their ICs, how many they buy per year, etc.

Realize that sci.electronics.repair is not hearingaid.components.market.research

True. Is largest by number of units sold, gross sales, or floor space in square meters? Presumably, you need this information for some sort of electronics repair.

I used to do this kind of research in other industries. If someone else hadn't done the necessary research and made it available, it would take me 2-3 days to find all the numbers for one product area. I couldn't find anything showing hearing aid sales, but may have missed something in the Google clutter.

I suggest you start with a list of manufacturers:

Their sales should be available on their web site, stock summary, or SEC filings. There's no standard for how they report their sales, so some analysis and creativity will be necessary.

Once you've identified the "largest" manufacturer, the chips used can possibly be found on the FCC type certification pages. Often the major manufacturers of low voltage hearing aid chips will disclose their major customers. Except for the largest vendors, I don't expect this information to be publicly available.

Good luck.

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I would suspect that the largest companies would design their own chips, to maintain a competitive advantage. These would be fabbed and tested by one of the various foundries.