18-04-2020, 11:24 AM
3MHz for a BD244, according to Towers'.
Trying to second-source that was tricky, as almost every datasheet out there is the Fairchild one, which omits that parameter. But there's a Bourns datasheet that more or less confirms it:
https://www.mouser.co.uk/datasheet/2/54/...159221.pdf
Must admit that I hadn't realised Bourns did semiconductors - I've always thought of them as making pots, presets and rotary encoders. This is the trouble with the "acquisition culture" at these big companies.
As for the Lockfits, don't chuck them! Yes, I think that they are just as likely to go bad when not in use, but if any of yours are unused, that might help to confirm that. One of my long-term plans is to build some sort of test jig to allow me to measure the noise they make when they go bad - the results would make a worthwhile follow-up to this article: https://www.markhennessy.co.uk/articles/...tm#lockfit
Trying to second-source that was tricky, as almost every datasheet out there is the Fairchild one, which omits that parameter. But there's a Bourns datasheet that more or less confirms it:
https://www.mouser.co.uk/datasheet/2/54/...159221.pdf
Must admit that I hadn't realised Bourns did semiconductors - I've always thought of them as making pots, presets and rotary encoders. This is the trouble with the "acquisition culture" at these big companies.
As for the Lockfits, don't chuck them! Yes, I think that they are just as likely to go bad when not in use, but if any of yours are unused, that might help to confirm that. One of my long-term plans is to build some sort of test jig to allow me to measure the noise they make when they go bad - the results would make a worthwhile follow-up to this article: https://www.markhennessy.co.uk/articles/...tm#lockfit
