What should be paid attention to in crystal oscillator welding? Refer to these methods

Date：2022-07-21 17:39:27 Views：1756

First of all, the soldering temperature should not be too high, and the soldering time should not be too long to prevent the crystal from internal change and instability. When the shell of the crystal oscillator needs to be grounded, it should be ensured that the shell and pins are not accidentally connected to cause a short circuit. Thus, the crystal will not vibrate. Ensure that the solder points of the two pins are not connected, otherwise the crystal will stop vibrating. For crystal oscillators that need to be cut, attention should be paid to the influence of mechanical stress. After soldering, clean it to prevent the insulation resistance from failing to meet the requirements.

These methods can be referred to for crystal oscillator welding

First of all, we know that the welding method of quartz crystal oscillator is related to its packaging. Plug ins and patches are two different welding methods. The chip crystal oscillator is divided into manual welding and automatic welding.

The welding of the plug-in crystal oscillator is not very complicated. First, put the crystal oscillator on the circuit board with tweezers and melt the solder with a hot-air gun. This is relatively simple.

The manual welding of SMD crystal oscillator is relatively complicated 1. First, add an appropriate amount of soldering tin to the chisel (flat shovel) or knife edge soldering iron head, dip a fine brush with soldering flux, or use a soldering pen to apply a small amount of soldering flux on the pads at both ends, and coat the pads with soldering tin; Hold the chip crystal oscillator with tweezers in one hand, stick it on the corresponding pad in the middle, and do not move after alignment; With the other hand, pick up the soldering iron to heat one of the pads for about 2 seconds, and evacuate the soldering iron; Then heat the other end pad in the same way for about 2 seconds.

Special reminder:

1. During the welding process, pay attention to keep the chip crystal oscillator close to the pad and put it right all the time to avoid one end of the crystal oscillator cocking up or welding skew. If the solder on the pad is insufficient, you can hold the soldering iron in one hand and the solder wire in the other hand for repair welding, which takes about 1 second.

2. First coat an appropriate amount of solder on the bonding pad, use a small nozzle nozzle for the hot air gun, adjust the temperature to 200 ℃ ~ 300 ℃, and adjust the wind speed to 1 ~ 2. When the temperature and wind speed are stable, clamp the components with tweezers with one hand and place them on the welding position. Pay attention to placing them correctly. Hold the hot-air gun firmly with the other hand, keep the nozzle vertical to the components to be removed, with a distance of 1cm ~ 3cm, heat it evenly, remove the hot-air gun after the solder around the chip crystal oscillator melts, and remove the tweezers after the solder cools.

In order to save money, many factories will use automatic Mounter for automatic mounting. We should pay attention to several problems during welding. If it is to weld the surface crystal, it is recommended to use automatic Mounter as much as possible, because the wafer inserted into the surface crystal quartz crystal oscillator is relatively thin and small, and it is easier to weld the ceramic crystal oscillator by hand. The quartz crystal oscillator is generally controlled at

1. Generally, the temperature of the soldering iron head is controlled at about 300 ℃, and the hot air gun is controlled at 200 ℃ ~ 400 ℃;

2. During welding, it is not allowed to directly heat the part above the heel of the chip crystal oscillator pin to avoid damaging the internal capacitance of the crystal oscillator;

3. Use ∮ 0.3mm ~ ∮ 0.5mm solder wire; The soldering iron head is always smooth, without hook or thorn; The soldering iron head shall not touch the pad again. Do not repeatedly heat on one pad for a long time. The working temperature of the conventional crystal oscillator is generally -40 - +85 ℃. Heating the pad for a long time may exceed the operating temperature range of the crystal oscillator, causing the life of the quartz crystal oscillator to be reduced or even damaged. In order to avoid damage to the resonator, please pay more attention to the welding process, so as to avoid unstable product performance.

The above is the content related to crystal oscillator welding compiled by the core detection team. I hope it will be helpful to you. Shenzhen Chuangxin Online Testing Technology Co., Ltd. is a well-known professional testing institution for electronic components in China, with 3 standardized laboratories covering an area of more than 1000 square meters. The scope of testing services covers: electronic component testing and verification, IC authenticity identification, product design and material selection, failure analysis, function testing, factory incoming material inspection, component X-ray testing, taping and other test items.