Tips for Printed Circuit Board Panelization
PCB panelization is a very important issue, which can influence the PCB board quality standard and PCB production cost. In this article, EPCB would like to introduce some tips for PCB panelization design.
1.PCB panelization width should be less than 260mm (SIEMENS line) or less than 300mm (FUJI line); if you need automatic dispensing, the width and length of PCB panelization should be 125 mm and 180 mm respectively.
2.The shape of the PCB panelization is as close as possible to a square. It is recommended to use 2×2, 3×3, ... panelization type; but not mirroe Board.
3.The outer frame (clamping edge) of the PCB board should adopt a closed-loop design to ensure that the PCB board will not be deformed after being fixed on the fixture.
4.The center distance between the small plates is controlled between 75 mm and 145 mm.
5.There must be no large devices or protruding devices near the junction between the panelization frame and the inner board, the small board and the small board. Besides, there should be more than 0.5mm space between the components and the edge of the PCB to ensure the cutting tool is operating normally.
6.Four positioning holes are made in the four corners of the outer frame of PCB panelization, and the aperture is 4mm±0.01mm; the strength of the holes must be moderate to ensure no breakage in later process; the aperture and position accuracy are higher, and the walls of the holes are smooth without burrs.
7.Each board in the PCB panelization board must have at least three positioning holes, the aperture of which is from 3mm to 6mm, and no wiring or patching is allowed within 1 mm of the rim positioning holes.
8.For the PCB positioning of the entire board and the reference symbol for fine-pitch device positioning, in principle, the QFP with a pitch of less than 0.65mm should be set at its diagonal position.
9.When setting a datum point, there is usually a 1.5 mm larger non-resist area around the datum point.
10.Large components should have positioning posts or positioning holes, such as I/O interfaces, microphones, battery interfaces, micro switches, headphone jacks, motors, etc.
11.Pay attention to pad metallization (PHT) and non-metallization (NPTH) for double-sided PCB boards.