Storm Circuit has many univeristy customers,such as Columbia University,Oregon State University.We recently made a specail circuit boards for Carnegie Mellon University.What is the special? The PCB has chip-on-board package,that is we have to cut a fixed depth and make finishing over the exposed copper,also this circuit board is Rogers 4003 material.The surface finishing is also special ,it is not ENIG ,but it is i ENEPIG---ENEPIG-Electroless Nickel Electroless Palladium Immersion Gold.
The design is four layer PCB.Chip on board package is the the small chip will be loaded in the PCB.We have to cut from top to the second layer to expose copper and make ENEPIG on it. The cutout is very small,only 2*2mm, the curvature will be a bit big if we use normal rout bit ,and this is rejected by our valued customer. So,to cut this small area,we use laser cutting ,looks very nice.
Full assembly service includes PCB manufacturing, components sourcing and assembly. Boards shipped in 3 days.
A beautiful LED board we made,how big it is? it is 550*420mm.and the important is there are hundres of LEDs and resistors. When LED lighting, it is really very beautiful.
The FPC is double sided,0.2mm,1.2mm FR4 stiffener at bottom side.
We offer quick turn PCB service. 6 layer with impedance control in 3 days. 8 layer in 4 days.
Here is a board we made in 3 days,it is 6 layer FR4,TG170,Immersion gold.impedance.
We know most of Al-substrate are single sided boards,but ,yes,there are always some exceptions. Some Al-substrate boards need to be doubles sided.We made a few of such boards,but designer always do not know what they want or what they designed.They do not know the Al-substrate is in the middle or at the bottom side .
Unlike FR4 PCB,any core-substrate boards have two types.One is sandwitch type as the Al-substrate is at the middle of board,like a sandwitch.Another is blind type.
See above for the Al-substrate boards stackup.All of metal-substrate boards like this too.Many double-sided metal-substrate boards used the first type--sandwitch .The metail is at the middle of the board.
Sandwtich Al board process is Al-susbtrate cutting --->drilling-->anodic oxidation--->stackup-->drilling, the last is the same as usual FR4 double layer board process.
Another type--blind type ,process is Al-susbtrate cutting --->drilling-->anodic oxidation
FR4 cutting --->drilling--->plating--->L2 layer---->stackup with above --->L1 layer--> the last is the same as FR4 double sided board process.
From the stackup,the hole is the main difference.The holes are through from TOP to Bottom side on sanswtch type.we can see holes easily. Blind type,the holes are not through,the bottom side is the Alminum.
So,when you design a double sided Al-substrate board,you can indicate it is Sandwitch or blind type or send us the stackup you want .
How we make assembly boards from your Altium or gerber file ? Below is a simple process.
1, We will export gerber file from your Altium .(Gerber file is preferred to us )
2,We will quote with your BOM and PCB file. any of your products photos will be helpful and 3D file.
3,PCB manufacturing following gerber. there are over 30 processes to do .drill -->plate. see our PCB process.WorkShop
4,In the meanwhile of PCB manufacturing,we will purchase components with your approved BOM.
5,PCB assembly,including SMT loading and Through hole soldering.
6,Final inspecting and photos to approve.
We made a lot of Rogers material+FR4 board,we call them mix stackup board. All are 6 layer PCB with special stackup. The stackup is as below. The stackup is making like an 8 layer PCB.
L1/L2 Core: RO 4350B 6.6mil
The PCB is 1.6mm, 1oz, blue solder mask,white silkscreen and immerion gold.Another special is the end lanch connector treatment. Trace at the connector is very small,we can not v-groove this board,otherwise,it will damage the trace and make short .
Pls see how to load the end lanch connector correclty.it is very strict,the board will not work if any damage.
how to load the end lanch connector.
Rogers material is well known in the world for high frequency ,RF application.But the most are RO 4003C and RO 4350B to use.
RO 3003 is well known in Military Application .here is the RO 3003 datasheet for you.
16 layer PCB
Different Thickness PCB
6 Layer PCB Assembly
Via in Pad