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PCB Libraries Forum : IPC-2221 & 2222 and Through-hole Pad Stacks

PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/RSS_ipc2221-2222-and-throughhole-pad-stacks_topic2586.xml

. IPC considers that both round and rectangle leadsare the same, but PCB Libraries, Inc. believes that the round terminal leadconsumes more volume in the hole than a rectangle lead and therefore the holeover round lead should be larger than hole over rectangle lead

PCB Libraries, Inc.

Hole size for through hole compoent - PCB Libraries Forum

PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/hole-size-for-through-hole-compoent_topic3025_post12054.html

. I found this IPC information: Minimum Hole Size = Maximum Lead Diameter + 0.20mm (for Level B of IPC-2222) Being the manufacturer of the power module does not specify

PCB Libraries, Inc.

Hole size for through hole compoent - PCB Libraries Forum

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/hole-size-for-through-hole-compoent_topic3025_post12056.html

. I found this IPC information: Minimum Hole Size = Maximum Lead Diameter + 0.20mm (for Level B of IPC-2222) Being the manufacturer of the power module does not specify

PCB Libraries, Inc.

PCB Libraries Forum : IPC-7251

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/RSS_ipc7251_topic1798.xml

;IPC-7351C calculation formula will be: Pad diameter = Hole size + 2*Min. annular ring(Min 0.2mm), or = Hole size * pad-to-hole-ratio, whichever is larger. But calculated result will be

PCB Libraries, Inc.

IPC-7251 - PCB Libraries Forum

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7251_topic1798.html

. I have other questions below: The calculation formula below for pad diameter is different with IPC-2221B 9.1.1, how to set "pad to hole ratio" and "minimum annular ring"? http

PCB Libraries, Inc.

IPC-7251 - PCB Libraries Forum

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic1798&OB=DESC.html

. I have other questions below: The calculation formula below for pad diameter is different with IPC-2221B 9.1.1, how to set "pad to hole ratio" and "minimum annular ring"? http

PCB Libraries, Inc.

IPC-7251 - PCB Libraries Forum

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7251_topic1798_post7361.html

: The calculation formula below for pad diameter is different with IPC-2221B 9.1.1, how to set "pad to hole ratio" and "minimum annular ring"? http

PCB Libraries, Inc.

PCB Libraries Forum : Proportional Through-hole Padstacks

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/RSS_proportional-throughhole-padstacks_topic90.xml

; So Proportional Padstacks meet or beat IPC-7251. The theory is simple. If a through-hole component lead has a large diameter it's for a reason

PCB Libraries, Inc.

Proportional Through-hole Padstacks - PCB Libraries Forum - Page 3

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/proportional-throughhole-padstacks_topic90_post1934.html

. So Proportional Padstacks meet or beat IPC-7251. The theory is simple. If a through-hole component lead has a large diameter it's for a reason

PCB Libraries, Inc.

Proportional Through-hole Padstacks - PCB Libraries Forum - Page 3

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/proportional-throughhole-padstacks_topic90_post1940.html

. So Proportional Padstacks meet or beat IPC-7251. The theory is simple. If a through-hole component lead has a large diameter it's for a reason

PCB Libraries, Inc.