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BGA Layout And Routing Considerations

Posted:05:55 PM June 17, 2021 writer: nextpcb

Introduction

The purpose of the prompt is to help the quality and improve the quality of the PCB design.

General design guidelines

BGA materials

There are two basic BGA materials: Ceramics and Organic (FR-4).

Different jewelry designs use different rules. The most common is FR-4B products and low-level data. 4 It is the material of choice for the merchant's processing technology. 4 The size and long solder paste surface are the preferred material for merchant processing.

ceramic VS Plastic





PAD sizes in FR-4

PAD sizes in FR-4
Pitch Pads Size Trace/Space Via
1.27mm 25mil  2X 5/5  25mil
1.0mm 19mil 2 X4/4 19mil
0.8mm 16mil  1X5/5 16mil

PAD sizes in Ceramics

Pitch Pads Size Trace/Space Via
1.27mm 28mil 

1top-2bottomX 5/5

25mil

Breakout Escape

Number of Layers: (Regarding the breakout from the BGA Only)

Pitch Breakout Escape rows No. of Layers
1.27mm T-6; B-6: 4
1.0mm T-6; B-6: 4
0.8mm T-4; Any other-6 4

Any additional layer pair can add 6 rows.

The following is a breakthrough escape example using 1mm BGA and 4mil trace x 4milspace.

It is possible (and recommended) to divide the BGA area into four equal parts. So as to make the escape more clever and flexible.

BGA quadrants

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Placement

  • Place BGA far away from board edge Leave at least 200mils space for rework around the BGA
  • Do not place components under the BGA Place the fan-out via on grid

 

Routing

  • Use a mm grid and dimension for all BGA routes The BGA is a block for route
  • Avoid routing signals and additional vias underneath the BGA Plug vias from the BGA side
  • Do not pour copper under the BGA top side. Keep the 75% rule for power trace
  • Connect the power first

Summary

In order for a circuit board with one or more BGA components to be effective, a low number of layers must be kept low, and strict restrictions must be made with the PCB manufacturer.

Tag: BGA Layout BGA routing
  • PCB
    Prototype
  • PCB
    Assembly
  • SMD
    Stencil

Dimensions: (mm)

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Other Quantities:(quantity*length*width is greater than 10㎡)

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