Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Ron Lahat

#16685

Stencil Opening | 22 February, 1998

Stencil Opening Looking for spec or any info to specify stencil opening for TSOP48 20mil that will consider also thickens and direction of printing, if applicable

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justin medernach

#16686

Re: Stencil Opening | 23 February, 1998

| Stencil Opening | Looking for spec or any info to specify stencil opening for TSOP48 20mil that will consider also thickens and direction of printing, if applicable Ron, Use a six mil foil thickness for your stencil. Go one to one with your aperture to pad lengths. Have your pads measure no less than 12 mils wide and use 10 mil wide apertures. It is advisable to orient the TSOP on the substrate so that the pads are oriented parallel to the squeegee stroke. Regards, justin medernach flextronics international

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Scott McKee

#16687

Re: Stencil Opening | 25 February, 1998

| | Stencil Opening | | Looking for spec or any info to specify stencil opening for TSOP48 20mil that will consider also thickens and direction of printing, if applicable | Ron, | Use a six mil foil thickness for your stencil. Go one to one with your aperture to pad lengths. Have your pads measure no less than 12 mils wide and use 10 mil wide apertures. It is advisable to orient the TSOP on the substrate so that the pads are oriented parallel to the squeegee stroke. | Regards, | justin medernach | flextronics international I've used the same formula with success. I also set my printer for a double pass to make sure the solderpaste fills the openings. I also clean the bottom of the screen after each stroke to prevent possible shorts. You may want to concider laser cut stencils for the 20 mil pitch apatures. Good Luck Scott McKee

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