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ACPM-5013-BLK Datasheet(PDF) 7 Page - AVAGO TECHNOLOGIES LIMITED |
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ACPM-5013-BLK Datasheet(HTML) 7 Page - AVAGO TECHNOLOGIES LIMITED |
7 / 14 page 7 Metallization Solder Mask Opening Solder Paste Stencil Aperture PCB Design Guidelines The recommended PCB land pattern is shown in figures on the left side. The substrate is coated with solder mask between the I/O and conductive paddle to protect the gold pads from short circuit that is caused by solder bleeding/bridging. Stencil Design Guidelines A properly designed solder screen or stencil is required to ensure optimum amount of solder paste is deposited onto the PCB pads. The recommended stencil layout is shown here. Reducing the stencil opening can potentially generate more voids. On the other hand, stencil openings larger than 100% will lead to excessive solder paste smear or bridging across the I/O pads or conductive paddle to adjacent I/O pads. Con- sidering the fact that solder paste thickness will directly affect the quality of the solder joint, a good choice is to use laser cut stencil composed of 0.100 mm (4 mils) or 0.127 mm (5 mils) thick stainless steel which is capable of producing the required fine stencil outline. 0.30 0.60 0.35 0.55 0.45 on 0.5mm pitch Ø 0.3mm 0.475 connected to a inner layer through a via hole for a better isolation between CPL_IN(ISO) and RFout 0.65 0.45 0.50 0.60 1.50 1.30 0.525 0.55 0.45 1.10 1.10 0.60 0.35 0.475 |
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