How to judge the quality of PCB

How to judge the quality of PCB

Due to the fierce competition in PCB market and the rising raw materials of PCB, more and more PCB manufacturers often use low prices to monopolize the market in order to increase their competitiveness. However, the reason behind the low price is to reduce the material cost and production cost, which will lead to problems such as easy cracking, easy scratching, and unqualified precision of PCB, seriously affecting the solderability and reliability of products. Next, Shenzhen PCB Factory will teach you how to judge the quality of PCB, so that you will not only pay attention to the price of PCB, but not the quality of PCB.

1. Distinguish the quality of circuit boards by appearance

First, distinguish the materials used for PCB, and then look at the discoloration of PCB ink, copper deposition, surface treatment and smell. The materials of PCB board are usually as follows: the common HB board 22F is the cheapest, and it is easy to deform and break, so it can only be used as a single panel. PCB surface color is dark yellow, with pungent smell, rough copper and thin color. The cost of single-sided 94V0 and CEM-1 board is higher than that of paperboard, but cheaper than that of semi fiberglass board. The surface of PCB is light yellow, which is mainly used for industrial boards and distribution boards requiring fire protection rating. FR4 glass fiber board, high cost and high strength. Basically, most double-sided and multilayer boards use this material. Copper can be very precise, and PCB boards are relatively heavy. Surface treatment includes OSP, gold deposition, hot air leveling and other processes. The PAD surface must not be contaminated. Otherwise, weldability will be affected. In addition, the size and thickness of the standard, weld appearance should also be considered. This may affect the welding quality.

2. Judge the quality of PCB itself

Specification requirements ▪  Meet the electrical connection requirements. ▪  The width, thickness and distance of the line shall meet the requirements to avoid high temperature, breaking or short circuit. ▪  The copper surface shall not be easy to oxidize, otherwise it will affect the SMT speed, and it cannot be used for a long time after oxidation. ▪  No other electromagnetic radiation. ▪  The shape shall not be deformed, and the hole position of the circuit board and the deformation error of the reference line shall be within the allowable range. ▪  High temperature, high humidity and special environment resistance shall also be considered. ▪  The mechanical properties of the surface shall meet the installation requirements. Shenzhen Honglijie PCBA production capacity ▪  The energy production is 2 to 14 layers, and 14-22 layers can be sampled for production. ▪  Minimum line width/spacing: 3mil/3mil BGA spacing: 0.20MM. ▪  Minimum aperture of finished product: 0.1mm Size: 610mmX1200mm. ▪  Ink: Tamura, Taiyo, Fuduoken, Japan. ▪  FR4: Shengyi, Jiantao, Haigang, Hongren, Guoji, Hezheng, Nanya, (Shengyi S1130/S1141/S1170), Tg130 ℃/Tg170 ℃, Tg180 ℃ and other high TG plates). ▪  High frequency board: Rogers, Taconic, ARRLON. ▪  Surface technology: tin spraying, lead-free tin spraying, gold deposition, full plate gold plating, plug gold plating, full plate thick gold, chemical tin deposition (silver), anti-oxidation (OSP) blue glue, carbon oil. The above is about how to judge the quality of PCB. If your PCB products need PCB proofing, SMT processing, and PCBA OEM, please contact Shenzhen Xingruixiang Electronics!