Electronics Forum: formulas (Page 1 of 37)

SMT Components

Electronics Forum | Tue Jul 09 00:19:04 EDT 2013 | isd_jwendell

formula(s) attached.

Re: footprint formula

Electronics Forum | Thu Mar 02 09:45:24 EST 2000 | Jacqueline Coia

Could this QFP be easily wave soldered if placed on solder side of PCB, if so are there two different footprint formulas that take both wavesoldering and reflow into consideration. Thanks again. Jack

Re: footprint formula

Electronics Forum | Thu Mar 02 09:45:24 EST 2000 | Jacqueline Coia

Could this QFP be easily wave soldered if placed on solder side of PCB, if so are there two different footprint formulas that take both wavesoldering and reflow into consideration. Thanks again. Jack

Component weight formula

Electronics Forum | Wed Mar 28 10:56:56 EST 2001 | jseagle

Does anyone know the formula for calculating the grams per sq cm of lead for mounting bottomside unglued components? Thanks James

Mathematical Formula

Electronics Forum | Tue Aug 24 00:24:58 EDT 1999 | Drake

I rotated my PCB -90 degrees. Now what's the formula to calculate the X-Y Coordinates of my component CAD Data? Thanks,

Re: Mathematical Formula

Electronics Forum | Tue Aug 24 07:22:33 EDT 1999 | Brian

| I rotated my PCB -90 degrees. Now what's the formula to calculate the X-Y Coordinates of my component CAD Data? | | Thanks, | Not very difficult (Subscripts n = new, o = old) Assuming the same origin: Yn = Xo Xn = -Yo Brian

Losing parts in reflow

Electronics Forum | Fri Jun 15 08:53:02 EDT 2007 | ed_faranda

I remember seeing that formula, but looking through my notes, I can't find it. My R&D group is starting to bigger and bigger parts on the bottom side. Could you please email or post that formula?

CM cost formula

Electronics Forum | Mon Feb 02 17:29:09 EST 2009 | diones

Hello all, I'd really like some input on devising a competitive cost formula for a new CM business in eastern Canada. If anyone has any experience or suggestions with this I would appreciate your comments. Thanks, Dion

PCBA Time Estimation Formula

Electronics Forum | Thu Mar 21 13:00:50 EDT 2019 | SMTA-Todd

I am looking for a good way to estimate assembly times per board. We currently use an engineer who looks at the BOMS and gerbers, but are looking for an alternative. Any formulas or software recommendations would be helpful.

BGA Square Aperture Formula

Electronics Forum | Mon Jul 03 13:02:19 EDT 2023 | fuji_user_2014

There are some "rule of thumb" design approaches for circle apertures for BGA's. Does anyone use rule of thumb formulas for square/squircle apertures for BGA? If so, what are they?

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