pcb layers in layout
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This document discusses the different types of layers used in a printed circuit board (PCB) layout. It describes 11 layers: the global layer defines component boundaries; the top and bottom layers are where components are mounted; inner layers separate top and bottom layers in multilayer PCBs; solder mask layers protect copper traces; solder paste layers define solder areas; silk screen layers contain text and markings; assembly layers define component shapes; and drill layers specify hole diameters. Each layer serves a distinct purpose in the PCB design and manufacturing process.
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【业务选择办理准则】
一、工作未确定，回国需先给父母、亲戚朋友看下文凭的情况，办理一份就读学校的毕业证【微信：A575476】文凭即可
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[To download this presentation, visit:
https://www.oeconsulting.com.sg/training-presentations]
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Forrester’s Digital Transformation Framework
IDC’s Digital Transformation MaturityScape
MIT’s Digital Transformation Framework
Gartner’s Digital Transformation Framework
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pcb layers in layout
- 1. PCB LAYERS IN LAYOUT Prepared by: Anum Mairaj
- 2. TYPE OF LAYERS IN PCB LAYOUT GLOBAL LAYER 1.GLOBAL LAYER “The boundary or outline around a component on PCB, where any other component is not enter, this layer is known as global layer.” . . . . . . . . . . ... .. . . .. .. 3 2 1 6 5 4 7 8 11 10 9 14 13 12
- 3. 2. TOP LAYER “In solder mount assembly, the layer which are at the top of PCB where are mounted, called TOP layer. This layer is normally green in colour.” 3. BOT (BOTTOM) LAYER “In through hole, where the components are soldered, this layer is called BOT (BOTTOM) layer.”
- 4. 5. SMT (Solder Mask Top) “On the top of PCB Solder mask is a thin layer of polymer that is usually applied to the copper traces of a printed circuit board (PCB) for protection against oxidation.” 6. SMB (Solder Mask Bottom) “The green layer which is on the bottom of PCB, coated with solder mask, called SMB (Solder Mask Bottom).” With Solder Mask Without Solder Mask
- 5. 7. SPT (Solder Paste Top) “The layer which is on the top of PCB, use to define the area of solder paste on the pad of any component, this is called SPT (Solder Paste Top).” 8. SPB (Solder Paste Bottom) “On the bottom of PCB, the layer is use to define the area of solder paste on pad of any component, called SPB (Solder Paste Bottom).” PAD OF COMPONENT SOLDER PASTE LAYER
- 6. 9. SST (Silk Screen Top) “Line, art and text may be printed onto the top surface of PCB usually by screen printing epoxy ink, the layer use to represent the area of the text is known as SST (Silk Screen Top).” 10. SSB (Silk Screen Bottom) “Line art and text may be printed onto the bottom surface of PCB usually by screen printing epoxy ink, the layer use to represent the area of the text is known as SSB (Silk Screen Bottom).”
- 7. 11. AST (ASSEMBLY TOP) “The size or shape of any component is define on the top of PCB, through layer called AST (Assembly Top).” Assembly layer 12. ASB (ASSEMBLY BOTTOM) layer “The size or shape of any component is define on the bottom of PCB, through layer called ASB (Assembly BOTTOM).”
- 8. 4. INNER LAYER “In multilayer PCB, the central or mid Layer is present between top and bottom layer, called INNER layer of PCB.” 13. DRL (DRILL LAYER) “The layer which is use to define the diameter or size of drill on pad of any component, is known as DRL (DRILL LAYER).” DRILL LAYER PAD OF COMPONENT