to-220 (another eagle question) - Page 1
Forum section: electronics / general

author: snipersquad100
author_rank: Frequent Contributor
timestamp: October 04, 2013, 05:50:28 pm
content: Has anyone got a To-220 heatsink footprint for eagle?

author: c4757p
author_rank: Super Contributor
timestamp: October 04, 2013, 05:55:16 pm
content: Seriously?There are many different TO-220 heatsink designs. And if it doesn't take you about three minutes to draw it into a footprint from the manufacturer's drawing, that's a sign you need to practice doing so...

author: snipersquad100
author_rank: Frequent Contributor
timestamp: October 04, 2013, 05:57:39 pm
content: There's always one know it all.

author: chibiace
author_rank: Regular Contributor
timestamp: October 04, 2013, 05:59:58 pm
content: i think one of the regulators from the sparkfun lbr has a heatsink attached.

author: c4757p
author_rank: Super Contributor
timestamp: October 04, 2013, 06:12:37 pm
content: I'm not trying to be a know-it-all, I'm serious. Why would you want just a "generic TO-220 heatsink"? Wouldn't you want it to match one that you plan on using?

author: snipersquad100
author_rank: Frequent Contributor
timestamp: October 04, 2013, 06:34:50 pm
content: Thanks chibiace.To the other guy, I don't want to learn how to make my own footprints, I just want to use em. Im not a designer im a novis electronic hobbyist who just wants to make pcb's just for fun.

author: Dave
author_rank: Super Contributor
timestamp: October 04, 2013, 06:39:38 pm
content: Quote from: snipersquad100 on October 04, 2013, 06:34:50 pmYes, because drawing a footprint is something that can and should only be done by professionals. Hobbyists might get seriously injured!

author: c4757p
author_rank: Super Contributor
timestamp: October 04, 2013, 06:41:36 pm
content: Quote from: snipersquad100 on October 04, 2013, 06:34:50 pmMaking a footprint is easier than a whole PCB... and everyone who makes PCBs makes footprints. There really isn't anything to learn, placing stuff in a footprint is just like placing stuff on a pcb.- the other guy

author: snipersquad100
author_rank: Frequent Contributor
timestamp: October 04, 2013, 06:43:18 pm
content: read comment 6

author: WarSim
author_rank: Frequent Contributor
timestamp: October 04, 2013, 07:09:12 pm
content: Quote from: c4757p on October 04, 2013, 06:12:37 pmAnyone could send you what they call a "generic" heat sink footprint. Unfortunately there is no such thing.Firstly there are three general in dependant categories vertical horizontal and lateral. Which are you seeking?Then there are several different mounding methods and vane profiles. None are generic.You request seems to be asking for a collection of what others have made with not indication of scope.Heat sinks are selected by requirements and thus far you seem to be asking for a solution for any/all requirements or random requirments.

author: WarSim
author_rank: Frequent Contributor
timestamp: October 04, 2013, 07:13:11 pm
content: c4757pYour message was selected when I intended to reply to the author. I was not replying to you. I tapped in the wrong place.

author: Monkeh
author_rank: Super Contributor
timestamp: October 04, 2013, 07:20:30 pm
content: Quote from: snipersquad100 on October 04, 2013, 06:34:50 pmYou don't want to learn how to draw lines in exactly the same tool you're already drawing lines in?

author: tszaboo
author_rank: Super Contributor
timestamp: October 04, 2013, 07:32:54 pm
content: Not sure if OP is trolling us or not, but if you are that lazy, just use a D2PACK package part and draw your own heatsink on the copper.

author: Kjelt
author_rank: Super Contributor
timestamp: October 04, 2013, 08:12:45 pm
content: Anyone using eagle some day some part you get zilch on the existing parts and footprint search and you just have to learn to draw it yourself. Or beg on an electronics forum for some fool to do it for youIts not that difficult after you tried some and on youtube there are geat video tutorials that help.

author: snipersquad100
author_rank: Frequent Contributor
timestamp: October 04, 2013, 08:23:46 pm
content: Any to220 heatsink will do as its only a dummy load im attempting. I found one now.Thanks for the help.

author: Monkeh
author_rank: Super Contributor
timestamp: October 04, 2013, 08:30:22 pm
content: You could've drawn one in a matter of minutes.

author: c4757p
author_rank: Super Contributor
timestamp: October 04, 2013, 08:32:30 pm
content: Quote from: snipersquad100 on October 04, 2013, 08:23:46 pmWhoa there - a dummy load? That's often the exact opposite of "any TO-220 heatsink will do". How much power do you plan on dissipating?

author: snipersquad100
author_rank: Frequent Contributor
timestamp: October 04, 2013, 08:45:02 pm
content: haven't gota clue lol, It might catch fire.

author: c4757p
author_rank: Super Contributor
timestamp: October 04, 2013, 08:48:09 pm
content: I've definitely used that method before...Do you already have the heatsink on hand, or are you planning on buying it? I'd recommend either grabbing its datasheet or finding a similar one's datasheet, and doing a quick temperature computation. Take the thermal resistance of the heat sink, add about 2C/W for the transistor case, and multiply by the power you plan on burning to find how much the temperature will rise.Or go backwards to find the maximum power you can burn, based on about 80-100C maximum temperature.

author: snipersquad100
author_rank: Frequent Contributor
timestamp: October 04, 2013, 08:56:04 pm
content: I haven't gota clue what your on about, I get a bigish one and if it gets to hot I turn it off.

author: snipersquad100
author_rank: Frequent Contributor
timestamp: October 04, 2013, 09:38:02 pm
content: ive zipped the eagle file with 7zip if you wanna have a look and have a laugh lol

author: mariush
author_rank: Super Contributor
timestamp: October 04, 2013, 09:46:12 pm
content: Here, let me give you a clue... something like this if good for about 20-30 watts, maybe a bit more with a basic fan blowing air over it:It's a current load similar to the one here :http://www.sleepyrobot.com/?p=136I just used a different n-channel mosfet, I believe it wasfqp50n06lbut I can't be bothered to check if it's exactly this.When I tested it, it was doing about 12v @ 2-3A (24watts+) just fine, and the heatsink was hot but you could still touch it.This heatsink has a rating of about 4c/w .

author: snipersquad100
author_rank: Frequent Contributor
timestamp: October 04, 2013, 09:59:08 pm
content: thank you for that, I was thinking of something like that. Ive been looking at ian scott Johnston web site who uses a (rs component item nr 271-870) heatsink for his dummy load, I think its a neat idea to house the pcb in the heatsink.