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Electronics => Beginners => Topic started by: jheatac on August 16, 2024, 01:31:20 am

Title: Ceramic Axial Bead Capacitors
Post by: jheatac on August 16, 2024, 01:31:20 am

I'm just looking over a board and there are 4 yellow ceramic bead capacitors - axial through hole. They are in locations marked as a capacitor, but the markings have 4 digits ands everything I find says that ceramic capacitors only have 3 digits.

Markings are:

K5R printed above 103M
FC3 printed above 1004
TV2 printed above 1001

What are the ratings, please?

Title: Re: Ceramic Axial Bead Capacitors
Post by: tooki on August 16, 2024, 02:03:54 pm

First of all, 4-digit codes do exist, but the last digit is always a letter, indicating tolerance. 103M, for example, means 10nF 20%.
https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-smd-capacitor-code (https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-smd-capacitor-code)


Have you desoldered the caps to make sure these are the only markings?


Is it possible that 1004 and 1001 are not values, but date codes? (4th and 1st weeks of 2010, for example.)

K5R is Kemet code indicating 50V, X7R. See page 5 in https://archive.org/details/manuallib-id-2597468/page/4/mode/2up?q=K5R (https://archive.org/details/manuallib-id-2597468/page/4/mode/2up?q=K5R)
(Screenshot attached.)

Some googling suggests TV2 might be a tantalum, but this is not confirmed.