As one of the connectors with the strongest transmission function, the board-to-board connector is characterized by the mating use of board-to-board male and female sockets. The board-to-board connector used in mobile phones has strong corrosion resistance and environmental resistance, no welding is required, and the thickness of the mobile phone can be minimized to achieve a flexible connection. The application of thin and narrow-pitch board-to-board connectors in mobile phones is the current trend. It has the advantages of high precision, high performance, and small size. The process requirements for electroplating and patching are very high in manufacturing. high.
The basic structure of the board-to-board connector includes contacts, insulators, shells, and accessories. The basic principle of board-to-board connector modeling is that the impedance matching and RF signal requirements are very strict, which affects the signal transmission; the second is to pay attention to the plugging frequency during use, and the number of plugging and unplugging for the board-to-board connector reaches the limit After that, the performance will decrease; third, in different environments, such as high temperature, high humidity, mold, salt spray and other differentiated environments, there are special requirements for board-to-board connectors; fourth, according to the electrification situation, choose the needle Type or hole type board-to-board connector.
The performance indicators of board-to-board connectors include electrical performance, mechanical performance, environmental testing, etc. The specific performance is:
Electrical properties: contact resistance, rated current, rated voltage, withstand voltage, etc.
Mechanical properties: mechanical vibration, shock, life test, terminal retention, male and female inter-matching insertion force and pull-out force, etc.
Environmental testing: thermal shock test, steady state damp heat, salt spray test, steam aging, etc.
Other tests: solderability.
The test modules that need to be used in the performance test of the board-to-board connector must be able to maintain good performance in the field of small pitches, and must be able to cope with the different contact methods of the board-to-board male and female sockets to stabilize the connection. The pogo pin probe module and the high-current shrapnel micro-needle module are both precision connection test modules, but there are obvious differences in the board-to-board connector performance test, which can be seen through the comparative analysis of these two modules. .
The Pogo pin probe module is composed of a needle, a needle tube, and a needle tail, with a built-in spring and a gold-plated surface. In the large current test, the rated current that can be passed is 1A. When the current is conducted from the needle to the needle tube and then to the bottom of the needle tail, the current will attenuate in different parts, causing the test to be unstable. In the field of small pitches, the range of possible values of the probe module is between 0.3mm-0.4mm. For the board-to-board socket test, it is almost impossible to achieve, and the stability is very poor. Most of them can only use the light touch solution. response.
Another defect of the probe module is that it has a short life span, with an average life span of only 5w times. It is easy to pin and break pins during testing, and often needs to be replaced. It may also cause damage to the board-to-board connector. This will increase a lot of costs, and it will not be conducive to testing.
The high-current shrapnel micro-needle module is a one-piece shrapnel design. It is made of imported nickel alloy/beryllium copper material and is gold-plated and hardened. It has the characteristics of high overall accuracy, low impedance, and strong flow capacity. In the high current test, the current can pass up to 50A, the current is conducted in the same material body, the overcurrent is stable, and the available value range in the small pitch field is between 0.15mm-0.4mm, and the connection is stable.
For the board-to-board male and female socket test, the high-current shrapnel micro-needle module has a unique response method. Different head types contact the board-to-board male and female sockets to make the connection more stable.
The zigzag shrapnel contacts the board-to-board male socket and contacts the top of the board-to-board connector at multiple points to ensure the stability of the test.
The pointed shrapnel contacts the board-to-board female seat and keeps in contact with both sides of the board-to-board connector shrapnel to ensure long-term stability.
In addition, the high-current shrapnel microneedle module has a very long life, with an average life span of more than 20w times. It can reach 50w times under the condition of good operation, environment and maintenance. In the test, the high-current shrapnel micro-needle module has a stable connection and excellent performance. It will not cause any damage to the connector, and there will be no puncture marks. It can not only reduce costs for enterprises, but also improve test efficiency.
After analysis, it can be concluded that the high-current shrapnel micro-needle module is more suitable for board-to-board connector testing than the pogo pin probe module.
Post time: Dec-31-2020
