yeah fair point I mention it on the site but not the BOM
its added to the to do list today after museum! cheerz
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Tayda has a bunch of 1 nF options:
https://www.taydaelectronics.com/catalogsearch/result/?q=1nf+capacitor
which includes:
- Ceramic NP0/C0G (0±30 ppm/K), e.g. A-3524 (SMD), A-944 (SMD)
- Polyester (PET) (200-600 ppm/K), e.g. A-557, A-1531, A-1987
- Ceramic Y5P (±10% over −30/+85 °C) e.g. A-965
- This is the “best performance” option on their “easy ordering page”.
- Ceramic X7R (±15% over −55/+125 °C), e.g. A-3541 (SMD).
plus some unspecified types.
The last two are class 2 ceramics and are designed to be compact, at the expense of a high temperature coefficient; around 0.17%/K (or 1,700 ppm/K) on average across the full temperature range, but this is very much non-linear and can be several % at room temperature (see the chart in the comments here). These are great for decoupling/bypass, less so for timing.
I assume you ended up with one of the class 2 ceramics?
Ok, so before I had some regular ceramics with a 20% tolerance but I just got some C0G rated ones with a 1% tolerance from Mouser: #80-C410C102FAG5TA
Got them in there and it works beautifully now. Thank you all for your help with this!
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It’s not the tolerance that’s the issue, really, it’s the temperature coefficient — which for these is very good, ±30ppm/°C from −55°C to +125°C. Even for the C440 ones that are 10% tolerance!
Good to hear it’s fixed!
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Glad to hear it’s resolved!
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