Electronics Forum: qfp soldermask (Page 1 of 1)

Clearence of solder resist from QFP Leads

Electronics Forum | Fri Jan 09 09:43:48 EST 2009 | boardhouse

Hi Simon, The main reason that it would probably be removed would be do to lack of clearance for a soldermask dam from pad to pad. typically if the clearance from pad to pad is under .008 the solder mask dam would be removed. Min recomended dam siz

Re: Aperture Reduction for QFP (fine pitch)

Electronics Forum | Wed Sep 22 21:12:16 EDT 1999 | se

| | | | My stencil thickness is 6 mil and we got qfp's with fine pitch. | | | | how many percent should i reduce my stencil aperture using a 6 mil stencil for 0.5 mm pitch and 0.4 mm pitch ? | | | | | | | | thanks | | | | | | | We use 6 mil lasercu

Re: Aperture Reduction for QFP (fine pitch)

Electronics Forum | Wed Sep 22 22:23:55 EDT 1999 | SY

| | | | | My stencil thickness is 6 mil and we got qfp's with fine pitch. | | | | | how many percent should i reduce my stencil aperture using a 6 mil stencil for 0.5 mm pitch and 0.4 mm pitch ? | | | | | | | | | | thanks | | | | | | | | | We use 6

Re: Solder FINES vs. Solder Balls

Electronics Forum | Thu Apr 15 15:07:20 EDT 1999 | Mark Charlton

| | | Can someone explain the difference between solder "fines" and solder balls? Is there an official specification where "fines" are defined? What is the spec for "fines"? | | | | | | I consider "fines" individual unmelted metal spheres that ar

Re: Solder FINES vs. Solder Balls

Electronics Forum | Sat Apr 17 12:00:12 EDT 1999 | John W

| | | | Can someone explain the difference between solder "fines" and solder balls? Is there an official specification where "fines" are defined? What is the spec for "fines"? | | | | | | | | I consider "fines" individual unmelted metal spheres t

Re: Solder FINES vs. Solder Balls

Electronics Forum | Sun Apr 18 00:26:29 EDT 1999 | Vic Lau

| | | | | Can someone explain the difference between solder "fines" and solder balls? Is there an official specification where "fines" are defined? What is the spec for "fines"? | | | | | | | | | | I consider "fines" individual unmelted metal sph

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