How to Choose PCB MATERIAL? Complete analysis is here now
2018-12-14 13:55Writer: qyadminReading:
PCB base materials can be an important part of PCB. It determines the PCB table performance and range of software. Different products have different requirements on the PCB foundation material. Using the development of digital technology, PCB bottom material meet increasingly more difficulties, which also drive the introduction of copper clad laminate(CCL).
CCL has many classify methods. Generally, the reinforcing materials of the panel is split into five categories: paper foundation, cup fiber cloth bottom, composite foundation (CEM series), laminated multilayer plank bottom and special materials foundation (ceramic, metal primary bottom, etc.). If the CCL is categorized by the adhesive resin, the normal used paper-based CCI, phenolic resin (XPc, XxxPC, FR-1, FR-2, etc.), epoxy resin (FE-3), polyester resin etc. Glass fiber fabric CCL has epoxy resin (FR-4, FR-5), which is the hottest type of cup fiber cloth. Furthermore, there are a few other special resins (such as cup fiber towel, polyamide fiber, nonwoven fabrics): bismaleimide altered triazine resin (BT), polyimide resin (PI) , Diphenylene ether resin (PPO), maleic anhydride imide-styrene resin (MS), polycyclic ester resin, polyolefin resin, and so on.
Intro of Materials and Guidelines of Circuit Board
In accordance to flammability characteristics, we can separate PCB into 94VO, V-1, V-2, 94HB
94HB: Normal cardboard (non- fireproof, the cheapest grade material, can't be made as power plate)
94V0: flame retardant cardboard,
22F: single-sided fiber cup board
CEM-1: single-sided fiber cup board
CEM-3: double-sided half-glass table (You should use this materials rather than FR-4 to conserve $1~$2/ sq . meter
FR-4: double-sided fiber cup board
Halogen-free base materials identifies the material that will not contain halogen (fluorine, chlorine, bromine).The materials which contains Halogen will produce poisonous gas when burning.
Tg is the vitrification temperature, you can address it as melting point.
The circuit panel must be resistant to burning up. The board can't be burnt but it'll be smooth when warmed. At this warmed temperature point is named vitrification temperature.
The vitrification temperature (Tg point) relates to the sturdiness of PCB. Just what exactly is the benefit of high-Tg PCB circuit planks?
High-Tg PCB will be from the cup condition into rubber condition When the temperature increases to a certain level. Therefore the Tg quantity is described maximum temperature (℃) that PCB can be rigid. Normal PCB foundation material at temperature can be softening, deforming, Melting , also get much worse performance in the mechanical, electric characteristics.
Normal PCB materials Tg point is 130 ℃. Tg point for high Tg PCB is normally higher than 170 ℃. For medium Tg PCB, Tg point is just about 150 ° C.
With high Tg point, high-Tg PCB has better warmth resistance, moisture level of resistance, chemical resistance, balance and other characteristics. TG
In the lead-free digesting, the high-Tg PCB get wider program because lead-free digesting need higher temperature than digesting with lead.
Using the quick development of the consumer electronics industry, especially in the computer as the representative of the digital products, electric engineers want PCB with small vias, fine lines, lower thickness, it also need High-Tg materials.
High Tg PCB is significantly much better than normal FR-4 bottom materials. However the price will be higher.
Aluminium board is some sort of metallic foundation copper clad plank with good temperature dissipation ability. As well as the solitary layer panel comprises three layers: circuit coating (copper foil), insulating level and the steel bottom. The double-sided table is utilized in high-end design contain circuit coating, insulation layer, aluminium based, insulating level, circuit coating. Multilayer Light weight aluminum board is hardly ever seen. Normally we recommend you to use one layer Aluminium board, 2 or even more layers Light weight aluminum board is very costly.