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Categories: PCB assembly

PCB Assembly Files- PCB Enginner Need To Know

Some complex PCBs design be finished,you must take PCB to assembly plant when PCBs get back from PCB manufacturer.That assembly plant need you provide some necessary documents for production.Where the captain guy gave you talk about the PCB assembly when production of documents required,and what the representative of the file is useful.

PCB assembly processing required documents are the following:

1.Stencil file

Stencil file is solder paste file, it used in brush paste when PCB assembly, it can be automatically welded when PCB through high temperature furnace. But stencil file didn’t be included plug-in components information,it’s surface mount components information.What kind of stencil is? The following is a kind of stencil.

Above aperture is exposed for each surface mount components,no components area are covered. And the stencil is a certain thickness,the exposed holes are filled with solder paste when brush paste, then pcb pad coated with solder paste. The solder paste melting to stabilize assembly when soldering in high temperature.

2.Pick Place file

When assembly is processed with a machine.you have to tell the machine how to paste the components,which requires the coordinates of the document.Coordinate file also call pick place file,it has the coordinates of each components, layer, rotation angle and other information,the machine will be able to read this information,according to the requirements to paste components. Pick Place file are generally shown below:

Designator	Footprint	Mid X	Mid Y	Ref X	Ref Y	Layer	Rotation	Comment

U2	USON8_(3×4)	1341.535mil	276.575mil	1294.291mil	229.331mil	T	90	MX25R3235F
TP3	TP-L_3D	1066.929mil	60.039mil	1065.945mil	60.039mil	B	90	JTAG_TMSC
TP5	TP-L_3D	1121.063mil	125.984mil	1120.079mil	127.953mil	B	90	JTAG_TCKC
U4	GNS302uLP_-_BS	645.669mil	308.563mil	645.669mil	618.111mil	B	0	GNS302uLP
U5	YFP0025BABD	641.732mil	161.417mil	641.732mil	161.417mil	T	360	BQ25120YFPR
L3	0402L_3D	535.433mil	67.913mil	535.433mil	67.913mil	T	90	BLM15HG102SN1
C27	0402C_3D	482.284mil	67.913mil	482.284mil	67.913mil	T	270	10uF
u1	PVQFN32_3D	1143.701mil	184.055mil	1143.701mil	184.055mil	T	0	CC2640RHB
C7	0402C_3D	1024.606mil	335.63mil	1024.606mil	335.63mil	T	90	100nF
X2	2.0×1.2×0.6mm_crystal	936.024mil	135.827mil	936.024mil	135.827mil	T	90	32.768KHz
C26	0402C_3D	560.039mil	264.764mil	560.039mil	264.764mil	T	90	1uF
C25	0402C_3D	721.457mil	104.331mil	721.457mil	104.331mil	T	270	1uF
U3	LGA14	1349.409mil	430.118mil	1349.409mil	430.118mil	T	180	LSM6DSL
L7	6-0805_L	780.512mil	185.039mil	780.512mil	185.039mil	T	270	2.2uH
C1	0402C_3D	1231.299mil	346.457mil	1231.299mil	346.457mil	T	90	100nF
C2	0402C_3D	1066.929mil	25.591mil	1066.929mil	25.591mil	T	360	100nF
C6	0402C_3D	1183.071mil	346.457mil	1183.071mil	346.457mil	T	90	100nF
C13	0402C_3D	1390.748mil	531.496mil	1390.748mil	531.496mil	T	90	100nF
C16	0402C_3D	1340.551mil	531.496mil	1340.551mil	531.496mil	T	90	100nF
C19	0402C_3D	1380.906mil	117.126mil	1380.906mil	117.126mil	T	180	100nF
C20	0402C_3D	1151.575mil	25.591mil	1151.575mil	25.591mil	T	360	1uF
C21	0402C_3D	619.095mil	266.732mil	619.095mil	266.732mil	T	90	1uF
C22	0402C_3D	710.63mil	272.638mil	710.63mil	272.638mil	T	360	10uF
C23	0402C_3D	1380.906mil	167.323mil	1380.906mil	167.323mil	T	360	100nF
L2	6-0805_L	1282.48mil	40.354mil	1282.48mil	40.354mil	T	180	10uH
R3	0402R-v2_3D	1297.244mil	117.126mil	1297.244mil	117.126mil	T	180	56K
R4	0402R-v2_3D	561.024mil	178.15mil	561.024mil	178.15mil	T	270	56K
TP1	TP-L_3D	1245.079mil	54.134mil	1245.079mil	54.134mil	B	180	JTAG_TDI
C4	0402C_3D	1380.906mil	70.866mil	1380.906mil	70.866mil	T	360	10uF
C5	0402C_3D	1380.906mil	26.575mil	1380.906mil	26.575mil	T	360	10uF

There are components labels.X,Y coordinates,rotation angle,where level.

3.Component bitmap file

The component bit map file,in fact is the component silkscreen. It’s provided to operate workers to comparison in the production processing.Inspect if there’s any wrong of assembly.The component bitmap is shown below:

4.PCB assembly fixture file:

PCB assembly fixture file, it’s used in covering surface mount components and expose plug pin when PCB through reflow welding machine.Because in the production of the first process is surface mount welded,and then the plug-in welding.the plug-in soldering is done with wave soldering, it must be through wave furnace. The fixture is avoid surface mount components be assembled don’t fall when through wave furnace.

Top side of PCB fixture

Back side of PCB fixture

5.Panel drawing file

If PCB is made from panel,it also need provides panel file.Because the assembly manufacturers need panel drawing to make coordinates files.

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