What Are The Advantages of SMT Processing Technology?

SMT processing process:

First on the surface of printed circuit board solder coating solder paste, again with SMT machine components of metallized terminal or pin accurately on the bonding pad of solder paste, then put the PCB with components in the reflow oven whole heated to melting solder paste, after cooling, solder paste, solder curing is realized between components and printed circuit of mechanical and electrical connections. What are the advantages of SMT processing technology?

I. High reliability and strong vibration resistance

SMT processing USES a chip components, high reliability, small and light device, so the vibration resistance is strong, using automated production, with high reliability, generally poor solder joint rate is less than one over ten thousand, lower than the hole plugging component wave soldering technology an order of magnitude, to ensure that electronic products or components solder joint defect rate is low, At present, almost 90% of electronic products adopt SMT technology.

II. Electronic products are small in size and high in assembly density

The volume and weight of SMT components are only about 1/10 of those of traditional plug-in components. Usually, SMT technology can reduce the volume and weight of electronic products by 40%-60% and 60%-80%, respectively. The SMT SMT processing and assembly components grid from 1.27mm to the present 0.63mm grid, some are up to 0.5mm grid, through hole installation technology to install components, can make the assembly density higher.

III. High frequency characteristics, reliable performance

Due to the solid attachment of chip components, the device is usually leadless or short, which reduces the influence of parasitic inductance and parasitic capacitance, improves the high-frequency characteristics of the circuit, and reduces electromagnetic and rf interference. SMC and SMD designed circuits have a maximum frequency of 3GHz, while chip components are only 500MHz, which can shorten the transmission delay time. It can be used in circuits with clock frequency above 16MHz. With MCM technology, the high end clock frequency of the computer workstation can reach 100MHz, and the additional power consumption caused by parasitic reactance can be reduced by 2-3 times.

IV. Improve productivity and realize automatic production

To be fully automated, perforated PCB mounting currently requires a 40% increase in the area of the original PCB so that the assembly head of the automatic plug-in can insert the component, otherwise there is not enough space to break the part. Automatic SMT machine (SM421/SM411) uses vacuum nozzle suction and discharge element, the vacuum nozzle is smaller than the component appearance, but improve the installation density. In fact, small components and fine spacing QFP are produced by automatic SMT machine to achieve full automatic production.

V. Reduce costs and expenses

1. The use area of the printed board is reduced, and the area is 1/12 of that of the through-hole technology. If the CSP installation is adopted, the area will be greatly reduced.

2. The number of drilling holes on the printed board is reduced to save repair costs.

3. Due to the improvement of frequency characteristics, the cost of circuit debugging is reduced.

4. Due to the small size and light weight of chip components, the packaging, transportation and storage costs are reduced.

5. SMT SMT processing technology can save materials, energy, equipment, manpower, time, etc., can reduce costs up to 30%-50%.