Tiny 0201 under scope [general interest] - Page 1
Forum section: electronics / projects

author: David Chamberlain
author_rank: Frequent Contributor
timestamp: September 05, 2016, 01:42:57 pm
content: Accidentally ordered an 0201 part !!!! (on a 0.25mm'ish trace and 0402 [corrected yet again by everyone] for comparison).I can thread them through the vias no problemActually that zero ohm 0402 [not 0603 as everybody pointed out] is ugly - Vishay Dale

author: uncle_bob
author_rank: Unknown
timestamp: September 05, 2016, 03:32:50 pm
content: HiBe careful. Some 0201 caps have really weird dielectric materials.Bob

author: David Chamberlain
author_rank: Frequent Contributor
timestamp: September 05, 2016, 04:18:31 pm
content: Ok so I will pose a question. I can not for the life of me where I remember seeing/reading it (could have been one of Daves videos) but soldering ceramic SMD caps (or any SMD component) with the edge to PCB reduces parasitic inductance or did I just make up that random fun fact?

author: Macbeth
author_rank: Super Contributor
timestamp: September 05, 2016, 05:04:11 pm
content: Be careful not to breath them in!

author: tggzzz
author_rank: Super Contributor
timestamp: September 05, 2016, 05:31:03 pm
content: Quote from: pixulator on September 05, 2016, 04:18:31 pmYou need to get to microwave frequencies and be using "exotic" materials before you will notice the difference, but yes, you can sometimes move self-resonances from a couple of GHz to nearer 10GHz.There are also decoupling caps with the contacts along the long side (not across the short ends), to reduce inductance.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: September 05, 2016, 05:37:04 pm
content: Am I the only one who thinks the bigger part is a 0402? An 0603 would be bigger?I mean an 0201 is 20 x 10 mils, the larger part only looks like double the dimensions in each axis, ie 40 x 20 mils.And 0.25mils? That would be a seriously thin trace. Units are important, especially in PCBs, a mil is a thousandth of an inch.Now, 0.25mm would be about 10 mils, which lines up nicely with the dimensions of the 0201 part.

author: wraper
author_rank: Unknown
timestamp: September 05, 2016, 05:52:10 pm
content: Quote from: Alex Eisenhut on September 05, 2016, 05:37:04 pmyou are not alone

author: David Chamberlain
author_rank: Frequent Contributor
timestamp: September 05, 2016, 06:01:01 pm
content: See this is why I got in to trouble in the first place.I went to purchase 0603 imperial and accidentally purchased 0603 metric that is 0201 imperial.And double blunder, I meant to say 0.25mm trace width..Will edit original post to correct this.

author: wraper
author_rank: Unknown
timestamp: September 05, 2016, 06:21:52 pm
content: If it was (imperial) 0201 and 0603, 0603 should be 3x longer than smaller part, not 2x. Also the width of it would be 1.5x of 0201 length, which is certainly not the case. Therefore I'm pretty certain that bigger part is not 0603 but 0402 considering that pair of 0402/0603 won't have 2x difference in length as on the picture either.

author: David Chamberlain
author_rank: Frequent Contributor
timestamp: September 05, 2016, 07:36:51 pm
content: It's turning out to be one of those days.You are correct wraper it's a 0402. I have once AGAIN corrected my original post.Thanks

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: September 05, 2016, 08:22:39 pm
content: Quote from: pixulator on September 05, 2016, 07:36:51 pmPlease correct the correction, it was me who brought it up...

author: David Chamberlain
author_rank: Frequent Contributor
timestamp: September 11, 2016, 08:27:07 pm
content: Just a boring follow up video, for any one who is interested, of me putting the board together.Subsequent to this I did find a short under the QFN and fixed that and have software tested the Ethernet interface so at least the ARM chip and that is OK.

author: TheBay
author_rank: Unknown
timestamp: September 11, 2016, 10:27:07 pm
content: 0201's are easy to hand solder, I don't have a scope here so just get on with it