According to the new definition within IPC-T-50M a micro via is a blind structure with a maximum aspect ratio of 1:1, terminating on a target land with a total depth of no more than 0.25mm measured from the structure’s capture land foil to the target land.
Could you please advise what is a micro via hole?
August 12th, 2016When I need thicker tracks than standard, does track widths need wider?
August 12th, 2016Yes, in general, if you need the copper base thicker, the wider the track should be. One rule of thumb is that with a 18 µm copper base the track should not be narrower than 0.1 mm (4 mil) and with a 105 µm copper base the track should not be narrower than 0.25 mm (10 mil).
Is it possible to skip the dielectric layer and BT layer for SinkPAD PCB?
August 12th, 2016The answer is no, BT layer (Like as the FR4) and dielectric layer are very important, it is impossible to skip both of them or one of them.
Because the copper can’t be combined with meatal core, if we remove them, then we can’t make the trace on the metal base.
The other reason is the dielectric layer is most important for heat dissipation, normally, dielectric layer the thicker the better.
what is the minimum via size and the minimum copper diameter around the via?
August 12th, 2016Please let me know what is the minimum via size and the minimum copper diameter around the via.
1) The minimum via size means the minimum diameter for the PTH (Plated Through Hole) or NPTH( Non-Plated Through Hole).
Normally, for MCPCB, the minimum diameter of PTH is 0.3mm, the NPTH is 0.25mm.
2) The meaning of the minimum copper diameter around the via is hole ring.
Normally, the minimum diameter of hole ring is 0.2mm.
Does the high TG FR4 material for lead-free soldering is better than standardâ€TG FR4 material ?
August 12th, 2016No, it is not always. There are many factors to be taken into account, e.g. how many layers, the thickness of the PCB and also a good understanding of the assembly process (number of soldering cycles, time above 260 degrees, etc.). Some research has shown that a material with a “standard†Tg value has even performed better than some materials with a higher Tg value. Note that even with “leaded†soldering the Tg value is exceeded.
What is of most importance is how the material behaves at temperatures above the Tg value (post Tg) so knowing the temperature profiles the board will be subjected to will help you look evaluate the necessary performance characteristics.
What is the “aspect ratio�
August 12th, 2016The relationship between the diameter of the hole and its length. When a manufacturer states that their production has an “aspect ratio†of 8:1 it means, for example, that the hole’s diameter is 0.20 mm in a 1.60 mm thick PCB.
For HDI structures, a suitable aspect ratio for micro via is normally 0.8:1, with 1:1 preferable for ease of plating.
What are the ideal operating temperatures of both ceramic PCB and MCPCB?
August 12th, 2016Normally working temperature of MCPCB is <130℃, better less than 100C, dielectric layer in MCPCB is the bottle neck for high temperature, as the Tg value of that layer is only 130℃
Ceramic PCB can be: -50℃ to 800℃.
So if temperature higher than 130℃, then Ceramic PCB or High Tg PCB (but only around 170C) is good choice.
Does all kinds of PCB in one panel and combine them together with SMT are available ?
April 22nd, 2016Yes, we produced all kinds of FR4 PCB in one panel and also combine two kinds FR4 PCB together with SMT so far.
Please check the following pictures to know more detail.
- We put all kinds of boards in one panel to produce, after finish production and separate the boards, you can get several FR4 PCB.
Different design in on panel
Different design in one panel
- We produced the bare board separately and combine them with SMT.
We provide turnkey assembly service, so don’t hesitate to contact us if you have any questions about PCB manufacturing and assembly.
How to arrange the shipment by Sea or Air?
April 8th, 2016Normally, we send the goods to customers by Express. But it’s only for a small quantity and light weight. If mass production, the quantity always big and with heavy weight. if still by Express, the shipping fee would be very high. It’s no economy.So we will choose to ship out by Sea or By air.
- packed all the goods and making PL & CI.
- Booking the shipping space, get the S/O, arrange the truck to pick up the goods and delievery to relatively port or airport.
- Prepare the export customs files and do the customs clearance, files include declaration form, PL, CI,contract, Proxy and others customs needed.
- Goods boarded the plane or sea, get the B/L, making import clearance files, including C/O,FA,FB,FE etc. Provide this files to consignees or their agent.
- Consignees or their agent do the import clearance, pay the import fee, then to get the goods.
It is need about 4-7days to completely the process by air, 8-35 days by sea, depend on the Place of Delivery.
As PCB manufacturer we can provide turnkey and door to door service, meanwhile we also can help you if you have any shipping questions.
Why the DCB ceramic PCB surface easy yellow during the production?
April 8th, 2016We always see the yellow surface in the DCB ceramic PCB surface although it does not affect the function, but looks unbeautiful. In order to strongly combine the copper with ceramic substrate, especially when the copper is little, the exposed more substrate we need to do a special sinters process under appropriate high temperature, so it caused.
It’s unavoidable, we need to check and choose the better to ship out.