Re: [PEDA] Assembly Drawing Instruction on TO 220
It's also worth specifying the pins to be bent around a certain radius *away* from the neckdown; bending them too close, or allowing the leads to bend naturally at the neckdown without a nice formed radius, makes the swiny things fall off at the stress raiser caused by the sharp bend, especially after being subjected to mechanical or thermal stress I've had so many of these leads fall off in service when myself or others couldn't be bothered forming the bend smoothly, I always do it now for important projects! Hope this helps a bit gp * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Assembly Drawing Instruction on TO 220
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > [EMAIL PROTECTED] writes: > ... > > 4. Solder component. > > 5. Attach using screw/nut > > > > > > I'd want to reverse the last two instructions. Once it's > soldere Good point. So much for informality ;) * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Assembly Drawing Instruction on TO 220
International Rectifier has some app notes on it (AN-1012 comes to mind)... * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Assembly Drawing Instruction on TO 220
In a message dated 12/11/2002 6:27:37 PM Eastern Standard Time, [EMAIL PROTECTED] writes: > Not sure that "formal" instructions are really necessary. My own informal > isntructions might go something like this: > > 1. Bend leads just past neckdown to 90 degrees. > 2. apply heatsink compound to screw tab (underside of TO-220) > 3. Insert component. > 4. Solder component. > 5. Attach using screw/nut > > I'd want to reverse the last two instructions. Once it's soldered, any misalignment of the mounting will add stress to the solder joints when you screw it down. By screwing it down first, you ensure that only residual thermal stresses are left in the solder joints. Steve Hendrix * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Assembly Drawing Instruction on TO 220
Not sure that "formal" instructions are really necessary. My own informal isntructions might go something like this: 1. Bend leads just past neckdown to 90 degrees. 2. apply heatsink compound to screw tab (underside of TO-220) 3. Insert component. 4. Solder component. 5. Attach using screw/nut Just make sure that your footprint has an appropriate distance between pads and heatsink screw hole. I see your "footprint my (?might?) vary". That will probably lead to problems, regardless of any formal treatment... aj On 04:25 PM 12/11/2002 -0600, Michael Biggs wrote: >Does anyone have any formal assembly instructions for a voltage regulator >part in a TO-220 package that lays flat with the three pins are bent 90 >degrees and inserted into board and the base on a heat sinking pad secured >by a screw and nut? I am curious to weather I should include a prepping >distance on the pins fro the assembler? I'm sure each assemblers process >might be different as well as my footprint my vary. >Any help? >Thanks * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
[PEDA] Assembly Drawing Instruction on TO 220
Does anyone have any formal assembly instructions for a voltage regulator part in a TO-220 package that lays flat with the three pins are bent 90 degrees and inserted into board and the base on a heat sinking pad secured by a screw and nut? I am curious to weather I should include a prepping distance on the pins fro the assembler? I'm sure each assemblers process might be different as well as my footprint my vary. Any help? Thanks * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
