Factors Considered When design Spring Pogo pin
Pogo pin is a precision connector used in mobile phones and other electronic products. It is widely used in semiconductor equipment for connection.
There are different appearances according to different applications, but as a whole, there is a precision spring structure inside the pogo pin. The surface of the product is generally gold-plated, and the spring should also be gold-plated when the process is required.
The Pogo pin realizes energization or conduction, and most of it contacts the copper wall through the oblique lower side, and the spring bears a small amount, so the inner wall of the copper sleeve is required to be smooth. The electrical characteristics will actively find the path with the smallest resistance to conduct current. For example, if the POGOPIN factory has a non-beveled surface, but a flat bottom, most of the current will be conducted through the spring, and the requirements for the spring will be very high.
First, low voltage contact resistance
The power supply voltage and current do not change the size of the physical contact surface and the oxide and film of the contact surface. To evaluate the contact resistance of the contact system, the test maximum current is 100mA and the maximum open-circuit voltage is 20mV.
Second, insulation resistance
When a direct current potential is provided between adjacent contact points or between metals closer to the contact points, the resistance of the insulating material is detected.
Third, withstand voltage
The voltage can withstand when the system voltage suddenly increases or the connector is suddenly damaged safely due to switching.
Fourth, positive force
The contact system is used normally, the contact point bears the pressure perpendicular to the contact surface, and the working point of the pogo pin connector is greater than 60gf.
Fifth, durability
Because the contact surface will wear out during insertion and removal, wear will reduce the mechanical and electrical performance of the connector. In the setting environment, the connector is inserted and removed one cycle at a time, and the pogo pin connector can withstand a relatively small insertion cycle. The number of times the connector's durability is evaluated. The pogo pin connector can withstand the insertion and removal cycle rate up to tens of thousands of times.
Sixth, vibration
Evaluate the influence of small changes in the contact surface caused by mechanical forces on the electrical characteristics of the contact system. The pogo pin connector has a vibration frequency of 10~500HZ for 15 minutes, an amplitude of 1.2mm, the power failure does not exceed 1μsec, and the contact impedance is <100mOhm.
Seventh, mechanical shock
Detect the mechanical and electrical integrity of the connector. When the connector device acts on the electronic device, it may be impacted during handling, transportation, etc.
Eighth, thermal shock
When the pogo pin connector is exposed to extremely high temperature and low temperature, it detects resistance or encounters relatively bad conditions during storage, transportation, and use.
Ninth, temperature life
When exposed to a high-temperature environment where mechanical properties fail due to temperature changes, evaluate the impact of the environment on electrical stability. The high temperature will cause contact oxidation and reduce the positive force of the terminal, resulting in a decline in electrical performance.
Tenth, temperature and humidity cycle
Evaluate the impact of this environment on the electrical stability of the contact system in an environment exposed to high temperature, humidity, and mechanical failure. These effects include accelerated oxidation of the contact surface by oxidation and metal oxidation of minute particles between the contact surface and the underlying layer.
Finally, in the design process of the pogo pin spring thimble, we also need to pay attention to the use of technology. The so-called use of technology is to enable it to meet the requirements of automation at the time, especially the packaging machines used in some production lines. The requirements for this aspect are higher. Some manufacturers are precise because they have not improved their technology. , In the end, it is difficult to have a good performance advantage. Therefore, in the production process of this kind of equipment, there is also a need for better technology applications. Although many manufacturers have scientific and technological strength, because of insufficient design strength, there is no better product in the end.
