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Forum: PCB Design & Technology How To Check PCB Production Information


von Karen Z. (Company: 86PCB) (karen)


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1. Check the integrity of the documents provided by the customer - 
whether it meets the needs of the PCB factory.

2. Review the processability of the documents provided by the customer - 
whether the board factory can achieve the customer's design

3. Fully understand the customer's design intent and provide customers 
with professional qualified products.

4. Provide the basis for the quotation, provide production materials for 
production

The following image is a self-checking table for production data, which 
can be checked item by item according to the form:

see the attachment

The customer should clarify the above information when providing the 
engineering materials, but the different documents that can be scattered 
can be refined. If the customer fills in the relevant information and 
self-test according to this form, it is perfect!

The customer's PCB board information is divided into two parts, one is 
the customer's Gerber data, and the other is the customer's board 
description. The following explains the table one by one. I hope that 
you can become a PCB expert after reading this article.

1.Gerber data format
There are many PCB file formats, such as: PROTEL, ALTIUM DESIGNER, 
CADENCE, EAGLE, ORCAD, PADS, P-CAD and other formats. PCB designers use 
professional electronic design automation (EDA) or computer-aided design 
systems (CAD) software. However, the PCB format cannot be directly taken 
to the factory for production. The PCB production plant needs to convert 
these PCB format files into gerber format and import them into 
computer-aided manufacturing software (CAM) for engineering review.

The Gerber file is a collection of document formats used by the circuit 
board industry to describe the image of circuit boards (circuit layers, 
solder masks, character layers, etc.) and drill and mill data. It is the 
standard format for image conversion in the printed circuit board 
industry. File conversion is a key step in the pcb board. It is 
recommended that customers provide gerber-style files directly. The 
RS274-X format is optimal, and it is not easy to make mistakes when 
importing CAM software. At present, the most commonly used CAM software 
in China is CAM350 and GENESIS2000 software.

2. Implementation Standards
Common standards for the PCB industry are as follows:
1.IPC-FC-240 - Flexible Printed Circuit Board Specification
2.IPC-A-600 - Acceptability of printed circuit boards
3.IPC-D-300 - Dimensions and tolerances of printed circuits board
4. IPC-SM-840 - Qualification and performance testing of permanent 
solder masks on printed circuit boards
5. IPC-6011 - Overview PCB Board Performance Specification
6. IPC-6012 - Rigid PCB Qualification and Performance Verification 
Specification

3. PCB Thickness
The thickness of the finished PCB board must be clear. The circuit board 
factory will select different plates or laminates to meet the thickness 
of the finished board according to the number of layers and whether 
there is characteristic impedance.

4. Plate Type
Commonly used plates are classified as follows from the bottom to the 
top according to the grade:
94HB/CEM-1/CEM-3/FR-4
The details are as follows:
94HB: ordinary cardboard, not fireproof (minimum material, die punching, 
can not be used as power board)
CEM-1: Single-sided fiberglass board (must be drilled by computer, not 
die-punched)
CEM-3: double-sided semi-fiberglass board (besides double-sided 
cardboard, which is the lowest material of the double-panel, simple 
double-panel can use this material)
FR-4: double-sided fiberglass board
(The classification of flame retardant properties can be divided into 
94V-0 /V-1 /V-2, 94-HB four)
Prepreg thickness: 1080=2.8mil, 2116=4.5mil, 7628=7mil

5.6. Outer \ Inner Copper Thickness
According to the function that the design engineer wants to achieve in 
combination with the PCB production process, to clearly the thickness of 
the inner and outer copper.
1 OZ (ounces) = 35um (microns) = 1.4 mil (mil)

7.8. Solder Mask Color\Silk Screen Color
According to the color required by the design engineer, select different 
surface processes, difficulties and different types to produce.

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