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6 Layer Gold Finger Fr4 Multilayer DIY Board Black PCB Maker
Gold finger pcb sample:
Material:Fr4
Layer:6
Board thickness:1.18mm
Surface finish: immersion gold
Copper weight:0.5OZ
Black solder mask ,white silkscreen
Special: BGA+Gold finger,0.12mm laser hole
Certificate: UL, ISO 9001, ISO 14001
Min line width | 5mil | Min line space | 5mil |
Min hole | 0.12mm | BGA | filled |
Sample time | 7 days | Gerber file | Need |
Gold finger concept:
Gold Finger is a gold-plated terminal of a card-edge connector, they may be normally applied for inserting this PCB into yet another installation as a connection. They may be generally being produced as “PCB gold finger chamfer”; the common degree is 30 or 40. In prototype PCB production, gold fingers are typically getting produced without chamfer when the receiver doesn’t know what it. Due to the fact for proto PCB order, if you require the chamfer and PCBs are not, you are able to mull by hand.
Gold finger is the computer hardware such as: (between memory and memory slots, graphics and graphics card slot, etc.), all the signals are transmitted through the gold finger. Goldfinger by a number of conductive gold contacts, because of its surface gold-plated conductive contacts and arranged like a finger, so called "Goldfinger." Actually goldfinger is covered with a layer of gold in the CCL through a special process, because the oxidation resistance of gold is extremely strong, and the conductivity is also very strong.
The way of clean oxide layer of gold finger:
We all know that our computer with a long time using,will have a little dust inside, and sometimes the computer does not light up, take out to wipe the memory or the graphics card and bright fingers,then will light up.
When you remove the graphics card or memory, you will find the golden finger is not so shiny. Why?
That is because the memory / graphics card long-term exposure to air, gold finger surface produced an oxide layer
There are several tools for removing oxide layers:
1: rubber(the rubbers that pupils used)
2: pencil (the carbon composition inside the pencil is conductive, after wiping the finger has a better conductive contact).
3: a small cotton ball dipped in anhydrous alcohol (cotton with a moderate alcohol back and forth wipe the finger, dry completely and then use).
Multilayer pcb stack up
The stack-up of a multilayer PCB refers to the arrangement and order of the layers in the PCB construction. The stack-up is a critical aspect of PCB design as it determines the electrical performance, signal integrity, impedance control, and thermal characteristics of the board. The specific stack-up configuration depends on the requirements of the application and the design constraints. Here is a general description of a typical multilayer PCB stack-up:
1,Signal Layers: The signal layers, also known as the routing layers, are where the copper traces that carry electrical signals are located. The number of signal layers depends on the complexity of the circuit and the desired density of the PCB. The signal layers are typically sandwiched between the power and ground planes for better signal integrity and noise reduction.
2,Power and Ground Planes: These layers provide a stable reference for the signals and help distribute power and ground throughout the PCB. The power planes carry the supply voltages, while the ground planes serve as return paths for the signals. Placing power and ground planes adjacent to each other reduces the loop area and minimizes electromagnetic interference (EMI) and noise.
3,Prepreg Layers: Prepreg layers consist of insulating material impregnated with resin. They provide insulation between adjacent signal layers and help bond the layers together. Prepreg layers are typically made of fiberglass-reinforced epoxy resin (FR-4) or other specialized materials.
4,Core Layer: The core layer is the central layer of the PCB stack-up and is made of a solid insulating material, often FR-4. It provides mechanical strength and stability to the PCB. The core layer may also include additional power and ground planes.
5,Surface Layers: The surface layers are the outermost layers of the PCB, and they can be signal layers, power/ground planes, or a combination of both. The surface layers provide connectivity to external components, connectors, and soldering pads.
6,Soldermask and Silkscreen Layers: The soldermask layer is applied over the surface layers to protect the copper traces from oxidation and prevent solder bridges during the soldering process. The silkscreen layer is used for component markings, reference designators, and other text or graphics to assist in PCB assembly and identification.
The exact number and arrangement of layers in a multilayer PCB stack-up vary depending on the design requirements. More complex designs may have additional power planes, ground planes, and signal layers. Additionally, controlled impedance traces and differential pairs may require specific layer arrangements to achieve desired electrical characteristics.
It's important to note that the stack-up configuration should be carefully designed, taking into consideration factors such as signal integrity, power distribution, thermal management, and manufacturability, to ensure the overall performance and reliability of the multilayer PCB.
There are several kinds of multilayer PCBs that are used in different applications. Here are some common types:
Standard Multilayer PCB: This is the most basic type of multilayer PCB, typically consisting of four to eight layers. It is widely used in general electronic devices and applications where moderate complexity and density are required.
High-Density Interconnect (HDI) PCB: HDI PCBs are designed to provide higher component density and finer traces than standard multilayer PCBs. They often have microvias, which are very small diameter vias that allow for more interconnections in a smaller space. HDI PCBs are commonly used in smartphones, tablets, and other compact electronic devices.
Flex and Rigid-Flex PCB: These types of multilayer PCBs combine flexible and rigid sections into a single board. Flex PCBs use flexible materials like polyimide, while rigid-flex PCBs incorporate both flexible and rigid sections. They are used in applications where the PCB needs to bend or conform to a specific shape, such as in wearable devices, medical equipment, and aerospace systems.
Sequential Lamination PCB: In sequential lamination PCBs, the layers are laminated together in separate groups, allowing for a higher number of layers. This technique is used when a large number of layers, such as 10 or more, are required for complex designs.
Metal Core PCB: Metal Core PCBs have a layer of metal, usually aluminum or copper, as the core layer. The metal core provides better heat dissipation, making them suitable for applications that generate a significant amount of heat, such as high-power LED lighting, automotive lighting, and power electronics.
RF/Microwave PCB: RF (Radio Frequency) and microwave PCBs are designed specifically for high-frequency applications. They use specialized materials and manufacturing techniques to minimize signal loss, impedance mismatch, and electromagnetic interference. RF/Microwave PCBs are commonly used in wireless communication systems, radar systems, and satellite communications.
Multilayer pcb application:
Multilayer PCBs find application across various industries and electronic devices where complex circuitry, high density, and reliability are required. Some common applications of multilayer PCBs include:
Consumer Electronics: Multilayer PCBs are extensively used in consumer electronic devices such as smartphones, tablets, laptops, gaming consoles, televisions, and audio systems. These devices require compact designs and high-density interconnections to accommodate numerous components.
Telecommunications: Multilayer PCBs play a crucial role in telecommunications equipment, including routers, switches, modems, base stations, and network infrastructure. They enable efficient signal routing and facilitate the high-speed data transmission required in modern communication systems.
Automotive Electronics: Modern vehicles incorporate a wide range of electronics for functions like engine control, infotainment systems, advanced driver-assistance systems (ADAS), and telematics. Multilayer PCBs are used to accommodate the complex circuitry and ensure reliable performance in automotive environments.
Industrial Equipment: Multilayer PCBs are utilized in industrial equipment such as control systems, robotics, automation systems, and manufacturing machinery. These PCBs provide the necessary interconnections for precise control and monitoring of industrial processes.
Aerospace and Defense: The aerospace and defense industries rely on multilayer PCBs for avionics systems, radar systems, communication equipment, guidance systems, and satellite technology. These applications demand high reliability, signal integrity, and resistance to harsh environments.
Medical Devices: Medical devices and equipment, including diagnostic tools, imaging systems, patient monitoring devices, and surgical instruments, often utilize multilayer PCBs. These PCBs enable the integration of complex electronics and assist in accurate and reliable medical diagnostics and treatments.
Power Electronics: Multilayer PCBs are employed in power electronics applications, such as inverters, converters, motor drives, and power supplies. They help manage high currents, heat dissipation, and efficient power distribution.
Industrial Control Systems: Multilayer PCBs are utilized in industrial control systems for process control, factory automation, and robotics. These systems require reliable and high-performance PCBs to ensure precise control and monitoring of industrial processes.
