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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 15th Oct 2018, 6:09 pm   #1
Al (astral highway)
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Default Voltage rating of these caps pls?

The 10nF ones are marked:
A100 103K C9727

The 1uF ones are marked:
A1C 105M

I’d be interested in the manufacturer too if anyone can help

Thank you
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Old 15th Oct 2018, 8:07 pm   #2
high_vacuum_house
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Default Re: Voltage rating of these caps pls?

I have some identical ones here (black cased) that are 63V rated

Christopher Capener
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Old 15th Oct 2018, 10:31 pm   #3
Al (astral highway)
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Default Re: Voltage rating of these caps pls?

Thanks Chris, that’s great.

To be clear, is that for both types?

Cheers!
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Old 16th Oct 2018, 5:51 am   #4
Argus25
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Default Re: Voltage rating of these caps pls?

I'm pretty sure the 103's are 100V types. I have seen these before used in mil spec gear in circuits running over 50V.

As for the 105's anybody's guess. For something like those I wouldn't push them over 50v. Though the A1C might indicate 100v, but unless a reference could be found, I'd not risk it. The 1 could be a multiplier and the C 100.
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Old 16th Oct 2018, 1:53 pm   #5
ionburn
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Default Re: Voltage rating of these caps pls?

I would have to double check, but I have fairly similar types which appear to be 100V DC but only 63V AC (which sounds sensible considering peak to peak).
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Old 16th Oct 2018, 5:14 pm   #6
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Default Re: Voltage rating of these caps pls?

This is an AVX MR061C103KTA 0.3" square 0.2" pitch which looks very similar to your first cap. (10n 100v 10% X7R)
Catalog is here, details on page 32.

Your second looks like an AVX SR series but the marking doesn't make sense to me.
If I had to guess I'd say A for AVX, 1 for 100V, C for X7R (although Z5U is more usual for 1uF).
Warm the cap up to around 60C, if the capacity drops like a stone it's Z5U.

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