Faqs

PCB Specification

Is the hole size defined in the Gerber file the finished hole diameters?

The hole size (contained in your Gerber file) is assumed as the finished hole diameters after plating. The tolerance of size is +/-0.08mm.

Can you tell me the thickness information about your 4-layer PCB stack-up?

The standard 1.6mm thickness 4-layer PCB stack-up is as below (from top to bottom): 1oz copper (0.035mm) + 7628Prepreg(0.1778mm) + 1.2mm core board + 7628Prepreg(0.1778mm) + 1oz copper(0.035mm). The tolerance of the finished thickness is +/-0.1mm.

We can also offer 4 layer PCBs with thicknesses of 0.8mm, 1.0mm, 2.0mm and 2.4mm. Please contact us to find out more information about a multi-layer PCB stack-up.

What is your standard specification of PCB?

Standard specification of PCB .The following is used for our standard specification of board : FR4, 1.6mm thickness, 1oz copper weight, white silkscreen, green solder mask, HASL/Gold finish.

Can I order a PCB with a non-rectangular shape?

Yes, you can, we accept any PCB shape,sure about the PCB with a non-rectangular shape.

Note that a rectangular outline (the minimum rectangular shape which can cover the entire PCB) will be used to calculate the board size. The shape should be clearly indicated in at least one of your copper layers. Otherwise you must supply a mechanical plan, separate from the Gerber file, indicating the shape of the PCB. This file has to have a reference to the copper layers, or has to have the same offset as the other layers.

Does CHENONN ELEC bevel gold fingers?

Yes,for bevel gold fingers,a standard 45-degree bevel will be added to your edge connector.

At your request, we can also bevel at 15 or 30 degrees upon request. For multi-layer boards please ensure you have adequate back set for the bevels. Please mention this in the order form when placing your order.

Are there any other colour options for the solder mask?

Although green is the standard colour we use for prototype PCBs.

We can also provide the following colours: red, white, blue, black, yellow, etc. You might need to pay a bit extra if these custom colours are used. Please contact us to find out more details(colour options for the solder mask)

Can I use CEM-3 for my prototype order rather than FR-4?

No. We didn’t see much difference between these two being used for prototype PCBs, so only FR-4 is used for the prototype PCBs. CEM-3 is available for a mass production order.

What board manufacturer do you use for FR4?

Customers can specify the material supplier for production orders. For prototype and low volume orders, the following are the main suppliers(board manufacturer) for FR4 board: Kingboard (Hong Kong), NanYa (Taiwan) and Shengyi (China).

Do you recommend a specific hole and pad ratio?

There are many factors to be considered including the hole type, size, board thickness, finish type.About the a specific hole and pad ratio ,for these normal through hole pads, we have the following values which are commonly referred. Hole/pad size in mm: 0.4/1.5, 0.5/1.5, 0.6/2.0, 0.8/2.5, 1.0/2.5, 1.2/3.0, 1.6/3.5, 2.0/4.0. Please contact us if you require any further suggestions.

Do you make flexible PCBs?

Yes. We are able to build flexible PCBs of up to four layers. The specifications are: polyester, 6mil minimum tracking width/clearance, 15mil minimum hole size, 1oz copper weight, 75µm base material thickness, HASL finish. These are the standard specifications for flexible PCBs.

PCB Specification

Is the hole size defined in the Gerber file the finished hole diameters?

The hole size (contained in your Gerber file) is assumed as the finished hole diameters after plating. The tolerance of size is +/-0.08mm.

Can you tell me the thickness information about your 4-layer PCB stack-up?

The standard 1.6mm thickness 4-layer PCB stack-up is as below (from top to bottom): 1oz copper (0.035mm) + 7628Prepreg(0.1778mm) + 1.2mm core board + 7628Prepreg(0.1778mm) + 1oz copper(0.035mm). The tolerance of the finished thickness is +/-0.1mm.

We can also offer 4 layer PCBs with thicknesses of 0.8mm, 1.0mm, 2.0mm and 2.4mm. Please contact us to find out more information about a multi-layer PCB stack-up.

What is your standard specification of PCB?

Standard specification of PCB .The following is used for our standard specification of board : FR4, 1.6mm thickness, 1oz copper weight, white silkscreen, green solder mask, HASL/Gold finish.

Can I order a PCB with a non-rectangular shape?

Yes, you can, we accept any PCB shape,sure about the PCB with a non-rectangular shape.

Note that a rectangular outline (the minimum rectangular shape which can cover the entire PCB) will be used to calculate the board size. The shape should be clearly indicated in at least one of your copper layers. Otherwise you must supply a mechanical plan, separate from the Gerber file, indicating the shape of the PCB. This file has to have a reference to the copper layers, or has to have the same offset as the other layers.

Does CHENONN ELEC bevel gold fingers?

Yes,for bevel gold fingers,a standard 45-degree bevel will be added to your edge connector.

At your request, we can also bevel at 15 or 30 degrees upon request. For multi-layer boards please ensure you have adequate back set for the bevels. Please mention this in the order form when placing your order.

Are there any other colour options for the solder mask?

Although green is the standard colour we use for prototype PCBs.

We can also provide the following colours: red, white, blue, black, yellow, etc. You might need to pay a bit extra if these custom colours are used. Please contact us to find out more details(colour options for the solder mask)

Can I use CEM-3 for my prototype order rather than FR-4?

No. We didn’t see much difference between these two being used for prototype PCBs, so only FR-4 is used for the prototype PCBs. CEM-3 is available for a mass production order.

What board manufacturer do you use for FR4?

Customers can specify the material supplier for production orders. For prototype and low volume orders, the following are the main suppliers(board manufacturer) for FR4 board: Kingboard (Hong Kong), NanYa (Taiwan) and Shengyi (China).

Do you recommend a specific hole and pad ratio?

There are many factors to be considered including the hole type, size, board thickness, finish type.About the a specific hole and pad ratio ,for these normal through hole pads, we have the following values which are commonly referred. Hole/pad size in mm: 0.4/1.5, 0.5/1.5, 0.6/2.0, 0.8/2.5, 1.0/2.5, 1.2/3.0, 1.6/3.5, 2.0/4.0. Please contact us if you require any further suggestions.

Do you make flexible PCBs?

Yes. We are able to build flexible PCBs of up to four layers. The specifications are: polyester, 6mil minimum tracking width/clearance, 15mil minimum hole size, 1oz copper weight, 75µm base material thickness, HASL finish. These are the standard specifications for flexible PCBs.