PCB Technical - PCBA processing prevents IC due to excessive voltage

What should the operator do to prevent the IC from being damaged due to excessive voltage during PCBA processing?

With the development of the electronics industry now, PCBA processing is becoming more and more popular. What is PCBA? It is a process in which PCB blank boards are loaded through SMT. This process is called PCBA for short. To put it more popularly, PCB is An empty circuit board without components, and PCBA is a circuit board with various electronic components soldered on. PCBA processing needs to be welded manually. There are a lot of things that need to be paid attention to during the welding process. Let's take everyone to see what are the precautions.

1. It must be operated with an electrostatic ring: the human body can generate static electricity above 10,000 volts, and the IC will be damaged when the voltage is above 300 volts, so the static electricity of the human body needs to be discharged through the ground wire.

2. Wear gloves or finger cots to operate: bare hands can not directly touch the machine board and the golden fingers of the components.

3. Use the correct welding temperature: welding angle and welding sequence to maintain proper welding time.

4. Take the PCB correctly: hold the edge of the PCB board when taking the PCB, and don't touch the components on the board with your hands.

What should the operator do to prevent the IC from being damaged due to excessive voltage during PCBA processing?

5. Try to use low-temperature soldering: high-temperature soldering will accelerate the oxidation of the soldering iron tip and reduce the life of the soldering iron tip. If the temperature of the soldering iron tip is greater than 470°C, its oxidation rate is twice that of 380°C.

What should the operator do to prevent the IC from being damaged due to excessive voltage during PCBA processing?

6. Do not apply too much pressure when soldering: Do not apply too much pressure when soldering, otherwise the tip of the soldering iron will be damaged and deformed. As long as the soldering iron tip can fully contact the solder joints, heat can be transferred. (Choose different soldering iron tips according to the size of the solder joints, which can also make the soldering iron tips better heat transfer).

What should the operator do to prevent the IC from being damaged due to excessive voltage during PCBA processing?

7. Do not knock or shake the tip of the soldering iron when soldering: knocking or shaking the tip of the soldering iron will damage the heating core and the tin bead spattering, shortening the service life of the heating core. If the tin bead splashes on the PCBA, it may form a short circuit and cause Poor electrical performance.

The above are some of the aspects that need to be paid attention to when processing, and there are many others. For example, you need to keep the soldering iron tip tinned frequently during PCBA processing, so as to reduce the possibility of oxidation of the soldering iron tip and extend its service life; and When soldering, the amount of tin and flux should be appropriate. Too much will cause welding defects, while too little will reduce mechanical strength and cause solder joint failure. Therefore, the amount of tin is very critical and needs to be mastered.