Help to identify smd capacitor - Page 1
Forum section: electronics / projects

author: veedub565
author_rank: Frequent Contributor
timestamp: January 31, 2021, 12:20:37 pm
content: Hi, could someone help me identify a smd capacitor. Picture is attached, it has TA820J printed on itI'm guessing it is a multilayer ceramic capacitor. With a value of 820pF ?I've got another one marked up TA221J (so 221pF?)What does the TA and the J denote?

author: iMo
author_rank: Super Contributor
timestamp: January 31, 2021, 12:26:32 pm
content: With smd with 3 digits the third digit tells you the number of zeros following the first two digits..

author: kripton2035
author_rank: Super Contributor
timestamp: January 31, 2021, 12:35:53 pm
content: my bet is more an inductor (82µH) than a capacitor, judging on the color.you should unsoldier it and measure it with a lcr meter, unless it's dead of course.

author: veedub565
author_rank: Frequent Contributor
timestamp: January 31, 2021, 12:41:46 pm
content: Ah ok so 221 would be 22 followed by one zero (220) and probably picofarad. I just read the last letter denotes tolerance on normal disc capacitors.

author: veedub565
author_rank: Frequent Contributor
timestamp: January 31, 2021, 01:26:17 pm
content: Could TA mean it is Tantalum ?Looking at the MLCC capacitors in RS they are all brown, this is white.

author: Niklas
author_rank: Frequent Contributor
timestamp: January 31, 2021, 02:19:45 pm
content: Looks like a high voltage 82pF (820) 5% (J) ceramic capacitor. C0G/NP0 capacitors are often grey instead of brown.

author: veedub565
author_rank: Frequent Contributor
timestamp: January 31, 2021, 02:33:20 pm
content: High voltage makes sense, its on the output of an RF amp.I wondered if it could be PEN film as they look similar

author: Niklas
author_rank: Frequent Contributor
timestamp: January 31, 2021, 06:57:35 pm
content: The SMD film capacitors that I have seen have had metal terminals similar to those on resistors. A thin metal sheet wrapped around the package with openings on the sides. In the picture it looks more like the terminals on a ceramic cap where all 4 sides area covered and the edge is not a straight line.

author: veedub565
author_rank: Frequent Contributor
timestamp: February 20, 2021, 06:13:10 pm
content: I think I finally identified this!I found a listing for ATC High Q capacitors, and it showed the silkscreen option as TA221Jhttps://www.yoycart.com/Product/617447668435/That then led me to American Technical Ceramics corphttps://www.richardsonrfpd.com/Products/Product/100E221JW3600Xand the datasheethttps://www.richardsonrfpd.com/docs/rfpd/100e.pdfSo it appears to be "ATC 100 E Series Porcelain High RF Power Multilayer Capacitor"TA = Still not quite sure what the TA means, but it looks plausible it's to do with the case style and size more than anything.221 =220pFJ = Tolerance of +/-5%So it does appear to be quite a specialised component, and awkward to replace

author: veedub565
author_rank: Frequent Contributor
timestamp: February 20, 2021, 06:52:24 pm
content: Mouser can source them... at a price! wowhttps://www.mouser.co.uk/ProductDetail/American-Technical-Ceramics-ATC-AVX/100E221JW3600X/?qs=IS%252B4QmGtzzqtNtz7Ddr6qg%3D%3D