1uf Low profile capacitors. - Page 1
Forum section: electronics / general

author: DMackey
author_rank: Newbie
timestamp: January 24, 2015, 05:10:34 pm
content: Can any one help me find low profile (5mm) 5.26mm diameter 1uf 16v or above electrolytic radial lead capacitors.I need them for a project with not much room.Thank you

author: rob77
author_rank: Super Contributor
timestamp: January 24, 2015, 05:14:16 pm
content: can't it be ceramic ? because you can have 1uF 16V ceramic as 1206 size with less than 2 mm profile.

author: DMackey
author_rank: Newbie
timestamp: January 24, 2015, 06:26:23 pm
content: These are the capacitors that connect to the MAX232 IC so they have to be electrolytic type.PUMP capacitors I think I seen it called on a datasheet for the MAX232's

author: Monkeh
author_rank: Super Contributor
timestamp: January 24, 2015, 06:30:56 pm
content: Quote from: DMackey on January 24, 2015, 06:26:23 pmWhat gives you that impression?

author: DMackey
author_rank: Newbie
timestamp: January 24, 2015, 06:45:49 pm
content: The capacitors are what was used in the original design for this Commodore 64 RS-232 device.If it's wasn't a RETRO device I would go all smd devices.

author: Monkeh
author_rank: Super Contributor
timestamp: January 24, 2015, 07:02:12 pm
content: Quote from: DMackey on January 24, 2015, 06:45:49 pmAre you repairing or just duplicating?If you're duplicating.. why?

author: DMackey
author_rank: Newbie
timestamp: January 24, 2015, 07:17:15 pm
content: I took over the guys project, he no longer had time to put into where I do.

author: mariush
author_rank: Super Contributor
timestamp: January 24, 2015, 07:19:25 pm
content: The voltage rating of the capacitors needs to be 16v or better because the voltages produced by the chip are in the range of 8..10v, maybe a bit more.However, the voltage rating on a capacitor is simply the maximum voltage the capacitor can tolerate. You don't HAVE TO use exactly these capacitors in your circuit, you can use capacitors with a higher voltage rating.Here's a list of electrolytic capacitors, sorted by capacitor height, not by quality - though for a rs232 the quality really won't matter:http://uk.farnell.com/webapp/wcs/stores/servlet/Search?catalogId=15001&langId=44&storeId=10151&categoryId=700000005424&sort=P_ATT_BASE_VALUE_1002608_EN_GB&pageSize=25&showResults=true&pf=110029771Also please note that the circuit doesn't really need 1uF capacitors, it will work fine with larger capacitors like 4.7uF or 10uF... the 1uF is just a simple all around value they use in the schematic in the datasheet.Note that you can also use ceramic capacitors if you don't care about the looks, but if you go with ceramic capacitors you really have to pick something with higher voltage rating, or use ceramic capacitors of larger capacitance value.Ceramic capacitors are "derated" with voltage, so if there's 10-12v going through a 1uF 16v ceramic capacitor, the capacitor will actually behave like one that's of lower capacitance, let's say 0.3-0.6 uF. So, either use a 1uF 50-100v rated ceramic, or maybe use a 4.7-10uF 25v ceramic capacitor.You'll find 1uF ceramic capacitors with leads but even with surface mount 0805 or 1012 ceramic capacitors, it's very easy to solder leads to if you want to make them through hole.

author: rdl
author_rank: Super Contributor
timestamp: January 25, 2015, 06:43:59 pm
content: Good quality Nichicon, 4x5 mm, 35 volts though.http://www.mouser.com/ProductDetail/Nichicon/UMF1V010MDD/?qs=sGAEpiMZZMtZ1n0r9vR22Xl3OG1fIDi9FHJ2Wkalb%252bI%3d

author: rob77
author_rank: Super Contributor
timestamp: January 25, 2015, 07:11:51 pm
content: Quote from: rdl on January 25, 2015, 06:43:59 pmMouser is a bit funnyStock: 534 Can Ship ImmediatelyOn Order: 3200 View Delivery Datesbut the pricing is up to 50k piecesdo they think that someone who need 50k+ of those will not approach the manufacturer's sales department directly ?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: January 25, 2015, 07:35:42 pm
content: Quote from: DMackey on January 24, 2015, 06:26:23 pmNo they don't ceramics are fine.Or you could use a more modern RS232 chip that uses 100nf caps, again ceramic is fine.