Author Topic: What is the standard TO220 footprint for "bent centre leg" fitting?  (Read 2166 times)

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Offline ocsetTopic starter

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Hi,
We are using a TO220 NFET in our 60W offline (240vac) flyback smps.
We wish to bend out the TO220 centre leg to increase clearance on the PCB.
This bending will doubtless be done by a machine eventually.
What is the standard "bent leg TO220" footprint? (ie the dimensions and PTH to PTH spacings that the "leg bending machines" most commonly work to)

Surprisingly, this didnt say...
https://www.infineon.com/dgdl/Infineon-Package_recommendations_for_assembly_of_Infineon_TO_packages-AN-v01_00-EN.pdf?fileId=db3a30431936bc4b011938532f885a38

The following says 1.75mm plus 1 to 2 times the leg thickness.....but is there a standard?
http://www.irf.com/technical-info/appnotes/an-1031.pdf

Also, the AN1031 doc  has all three leads bent........this must be from some standard "bending machine" otherwise it would be too labour intensive. Do you know which machine  is used?

OK, found PN5050, hoep someone else finds this useful.
https://www.olamefusa.com/e_spec_handtools.htm#PN505015

Very expensive tool though.
https://www.olamefusa.com/e_spec_handtools.htm#PN505015
« Last Edit: November 03, 2018, 11:13:24 am by treez »
 

Offline hermit

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Re: What is the standard TO220 footprint for "bent centre leg" fitting?
« Reply #1 on: November 03, 2018, 06:53:44 pm »
You might get a clue from this device.  7 pins and staggered.

https://www.analog.com/media/en/technical-documentation/data-sheets/3081fc.pdf
 

Offline floobydust

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Re: What is the standard TO220 footprint for "bent centre leg" fitting?
« Reply #2 on: November 03, 2018, 07:14:00 pm »
See On-Semi TO-220 case 340AX

You have to watch the bend radius so you don't stess the die or the leads. It's also another manufacturing step risking ESD damage.
Ultimately the TO-220/D2PAK package is limited for high-voltage creepage/clearance for regulatory.
Slots are also commonly used between the pads on the pcb.
 


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