PCB Assembly Express partners with a number of printed circuit board manufacturers in the USA to provide our customers a wide range of PCB capabilities. Every partner has its own unique spectrum of manufacturing capabilities. Some specialize in quick-turn prototype PCBs, some in complex multilayer boards with difficult to fabricate features like blind and buried vias, some in special materials like Rogers and others in flex and rigid-flex circuits.
|Material||standard specs||CUSTOM SPECS|
|Rigid PCB Material||FR-4 130Tg. 170Tg|| Rogers, Bergquist, polymide,
high-speed and high-frequency,
|Maximum # of Layers||10||12-40|
|Surface Finishes|| Leaded HASL, LF-HASL, ENIG,
Immersion Silver, OSP
|Hard Gold, Immersion Tin, ENEPIG|
|Minimum Trace Width, Outer Layer||0.005"||0.0025"|
|Minimum Trace Spacing, Outer Layer||0.005"||0.0025"|
|Minimum Trace Width, Inner Layer||0.005"||0.0025"|
|Minimum Trace Spacing, Inner Layer||0.005"||0.0025"|
|Minimum Mechanical Hole Size, Finished||0.008"||0.003"|
|PTH Hole Tolerance||+/- 0.003"||+/- 0.002"|
|NPTH Hole Tolerance||+/- 0.003"||+/- 0.015"|
|Minimum Board Thickness||1, 2, 4 layer: 0.031”|| 1,2 Layer: 0.010"
4+ Layers: 0.020"
|Maximum Board Thickness||0.125"||0.400"|
|Overall Thickness Tolerance||+/- 10%||+/- 4%|
|Maximum Board Size, 1 and 2 Layers||17.0 x 23.0"||Custom Quote|
|Maximum Board Size, 4+ Layer||16.0 x 22.0"||Custom Quote|
|Maximum Copper Weight, Finished||4 ounce||6 ounce|
|Outline Tolerance||+/- 0.004"||+/- 0.003"|
|Minimum Pth Hole Wall Thickness typical||0.001"||0.001"|
|Minimum Edge Clearance||0.010"||0.005"|
|Test Voltage||50 volts||1000 volts|
|V-cut Thickness Tolerance||+/- 0.004"||+/- 0.003"|
|Impedance Control Tolerance||+/- 10%||+/- 6%|
|Bow And Twist||.007" per inch||.003" per inch|
|Layer To Layer Registration||+/- 0.005"||+/- 0.002"|
|Edge Castellations (Plated Edge)||Yes|
|Minimum Component Pitch||0.010"||0.004"|
|Rigid-flex||1 Layer||8-12 Layers|
|Metal Core||1 Layer||4+ Layers|
The standard tolerance is +/- 0.010"
We rout to your board size using the center of the board outline.
Your printed circuit board outline does not have to be square or rectangular. You can submit round boards or boards with a complex shape. Our requirement is that we can convert your outline to a continuous unbroken path. By default, we will rout your board outline with a 0.0625" diameter rout bit. This will result in a minimum radius of approximately 0.032" on inside corners. If your design contains inside corners with radii of less than 0.032", then we will use a 0.03125" diameter rout tool to cut out your board. In this case, inside corners will have a minimum radius of 0.016". For tighter tolerances please request a custom quote.
This is the minimum air gap between any two adjacent copper features. Trace width is the minimum width of a copper feature, usually traces.
For trace width/spacing, we require a minimum of 0.005” for 1 oz. finished copper weight on outer layers. Premiums are added for trace/space specs less than 0.008"
For 1 oz. finished copper weight (inner layers), minimum trace width/space is 0.005"
For 2 oz. finished copper weight (inner & outer), minimum trace width/space is 0.007"
For 3 oz. finished copper weight (inner & outer), minimum trace width/space is 0.015"
For 4 oz. finished copper weight (inner & outer), minimum trace width/space is 0.020"
A minimum of 0.010” for outer layers and 0.014” for inner layers. For scoring, minimum of .015 for outer layers and .020 for inner layers. Copper features closer than the minimum specified edge clearance may be compromised during board routing.
For plated slots, the minimum width is 0.020".
For non-plated slots, the minimum width is 0.024".
Your design can have both plated and non-plated internal cutouts. We suggest that you add one layer for each type of cutout (plated or non-plated). Just place elements in these layers that are the exact shape of the cutout that you want. For example, if you want a 0.050" x 1.00" slot cutout of the board, then just add a trace of this size to the appropriate layer. If you have a more complex shape, then just submit it as one or more polygons that describe the edge of the cutout. We suggest you draw the polygon with an "F-Type" shape (a line of zero width). If you choose, you can draw the polygons with any width trace. We assume that the centerline of the trace describes the edge of your internal cutout. Plated cutouts will have the inside of the cutout plated with the finish that you choose (Tin/Lead HASL or ENIG (Immersion Gold)). Non-plated cutouts will not have any plating on the internal edges. Name your plated cutouts layer "PlatedInternalRouts". Name your non-plated internal routs "NonPlatedInternalRouts". If you wish, you can also supply a drawing that details the internal cutouts and we will create the needed geometry for you.
Overall thickness tolerance is +/- 10%
Minimum finished thickness for 2-layer: 0.010”
Minimum finished thickness for 4-layers: 0.031”
Minimum finished thickness for 6-layers: 0.040”
Minimum finished thickness for 8-layers: 0.047”
Minimum finished thickness for 10-layers: 0.062”
Any hole size between 0.008" and 0.250"
The minimum annular ring on vias is 0.006" (6 mils) each side of the hole. The pad must be large enough to tent over the hole otherwise you may lose the metal in the hole during outer layer etching resulting in plating voids.
If your design contains both plated and non-plated holes, then we prefer that you place these holes on separate layers. This will ensure that we understand your intent. Name your plated drill layer "PlatedDrills" and your non-plated drill layer "NonPlatedDrills"
The default rout tool diameter is 0.0625".
All features are cut out using this tool if possible (both internal features and the board outline). For smaller diameters please request a custom quote.
V-Score and Tab Route available
We can panelize your boards for you. If you send us a panel drawing, we will follow it. Otherwise we can suggest one for you. Boards can be tab-routed (.093 typical spacing) or V-scored (0.0” typical spacing).
|2 Layer||4 Layer||6 Layer||8 Layer|
|Layer 1||0.0017"||0.0017"||0.0017"||0.0017"||1.0 oz Copper|
|Layer 2||0.0017"||0.0014"||0.0014"||0.0014"||1.0 oz Copper|
|Layer 3||0.0014"||0.0014"||0.0014"||1.0 oz Copper|
|Layer 4||0.0017"||0.0014"||0.0014"||1.0 oz Copper|
|Layer 5||0.0014"||0.0014"||1.0 oz Copper|
|Layer 6||0.0017"||0.0014"||1.0 oz Copper|
|Layer 7||0.0014"||1.0 oz Copper|
|Layer 8||0.0017"||1.0 oz Copper|
|Copper Thickness||Core Thickness||Prepreg Thickness|
This is the expansion of mask relief over pad area. Our minimum is 0.005” over pad dimension or 0.0025” each side. PCB Unlimited will modify files to meet the minimum dimension.
When manufacturing your prototype circuit boards, there may be a small misregistration between the solder mask layers and the underlying copper layers. As a result, we recommend that you swell your solder mask layer so that it is 0.005" (0.0025" on a side) larger than the underlying copper elements. This way, if there is a misregistration, then your copper pads will not have any solder mask on them. You should also ensure that your design has a "Minimum Web" of at least 0.003" between adjacent pads. Smart DFM can pinpoint any problem areas for you.
We recommend that your silk screen features have a width of at least 0.007", although the absolute minimum for clear legibility is 0.006". If you submit Gerber data or a .bin ViewMate file to us, then we will modify your silk screen layers if any features are less than 0.007". If possible, we will set all features so that the minimum trace width is 0.007". Where this is impractical, we will reduce the silk screen feature size to a minimum of 0.006".
Orders received by their cutoff time the following business day is Day 1.
A yellow dot in a price matrix cell indicates a cutoff time of noon pacific standard time (PST). If the cell does not have a yellow dot the cutoff time is 5:00 p.m. (PST). If the time you place your order is passed the cutoff time the following business day is not Day 1.
Orders received on Monday will ship Tuesday.
Orders received on Tuesday will ship Wednesday.
Orders received on Wednesday will ship Thursday.
Orders received on Thursday will ship Friday.
Orders received on Friday will ship Monday.
Orders received on Monday will ship Wednesday.
Orders received on Tuesday will ship Thursday.
Orders received on Wednesday will ship Friday.
Orders received on Thursday will ship Monday.
Orders received on Friday will ship Tuesday.
Orders received on Monday will ship Thursday.
Orders received on Tuesday will ship Friday.
Orders received on Wednesday will ship Monday.
Orders received on Thursday will ship Tuesday.
Orders received on Friday will ship Wednesday.
Orders received on Monday will ship Friday.
Orders received on Tuesday will ship Monday.
Orders received on Wednesday will ship Tuesday.
Orders received on Thursday will ship Wednesday.
Orders received on Friday will ship Thursday.
Orders received on Monday will ship Monday.
Orders received on Tuesday will ship Tuesday.
Orders received on Wednesday will ship Wednesday.
Orders received on Thursday will ship Thursday.
Orders received on Friday will ship Friday.
Please keep in mind, add 1 lead-time process day for major US Holidays.
Major US Holidays do not count as a Business Day.