Detailed method of selecting the aviation plug

Often the importance of aviation plugs in electronic systems is often underestimated. Designers of many electronic systems have had a similar experience: using the cheapest aviation plugs, but often at the end of higher costs. The wrong selection and use of aviation plugs can result in system failures, product recalls, product liability cases, board damage, rework and repairs, which in turn can result in lost sales and customers. Therefore, in the design of electronic products, please do not underestimate the importance of aviation plugs, otherwise it will only be repaired due to small losses. It can be seen that the importance of choosing a suitable aviation plug for electronic devices.

So, how to choose an aviation plug? Due to the economic crisis, the cost factor will be taken into consideration when designing, but in addition, the quality and stability of the product should be emphasized, as well as the design of the aviation plug itself. Features. I think I can provide some suggestions for electronic designers through the innovative design of ERNI aviation plugs in the following aspects:

First: double-bar design ideas. The double-bar design concept in the ERNI aviation plug series is continuous throughout. In a vivid way, the double-bar design can be described as "one arrow and two sculptures". The optimized terminal design accommodates high speed signal transmission and provides higher orientation tolerances. In terms of inductance, capacitance, impedance, etc., the double-rod terminals are designed to be reduced for high-speed applications and optimized for minimum discontinuity. The two-bar design allows multiple air plugs to be on a single board without plugging or shorting, and there is no need for a large number of signals on a single air plug. The simple two-bar routing saves space, makes the aviation plug smaller, and simplifies the detection of soldered leads. For example, put 12 on a board. It also reduces the cost of rework. Practical applications such as telecommunications end user equipment.

Second: the assembly process has no bend bend design. Conventional stamping can cause bending or deforming pins due to improper handling, and the bending process can cause capillary cracks, which is undesirable from long-term products and affects circuit performance and cost. ERNI uses direct stamping of the corners, and the stamped terminals avoid capillary cracks caused by the bending process, ensuring a complete electromechanical connection. The pin coplanarity is 100%, controlled to a tolerance of ±0.05mm. 100% surface mount pin coplanarity inspection ensures the reliability of the board assembly process, ensuring good soldering, improving product quality and reducing cost. And to improve the robustness of the right-angle air plug, to prevent the aviation plug from being damaged due to improper operation, it is very appropriate to describe it as "unbreakable". Particularly suitable for inkjet printer controllers, InterfaceModule module interfaces, etc.

Third: high retention surface design. For SMT products, it is generally believed that the retention on the board is very poor. Is the surface-terminated PCB retention force lower than the via termination? The answer is: not necessarily. Through design improvement, it can effectively improve the retention of the PCB. If the welding bracket, the surface of the surface of the pin (microporous), the large pad are superimposed on three aspects, the retention force can be improved. In fact, even I/O aviation plugs can use surface mount pins. This can be visually compared to "rooting roots." For example, in the design of X-ray machines, ultrasonic scanners, and robotic Ethernet switches.

Fourth: Rugged design. To determine the robustness of the aviation plug, while allowing the use of flat block crimping tools, the plates are fixed to the outer casing for increased robustness, superior manufacturing processes and increased throughput. To sum up with one word is "a rock like a rock." Specific applications include positron emission tomography scanners, embedded systems for railway cars, and the like.

Fifth: high current, small pitch design. With the requirements of miniaturization of automotive electronics and consumer electronics, it is necessary to consider the design concept of high current and small pitch. Sixth: advanced lock design. ERNI uses a double-lock design to meet different needs. The positive lock is designed for powerful vibration applications. It is ideal for automotive and metro applications. The friction lock is designed for general vibration applications. The double-lock double safety fuse ensures a reliable connection and no special tools are required for on-site disassembly (repair/replacement) of the cable. Suitable for monitors, LED lights and other designs.

The terminal block used for the aviation plug is an important electromechanical component that is connected to the electrical circuit. Its specifications and quality requirements are very strict. Therefore, the power handling capability of the device is first considered when selecting. Different countries have different scales in determining the power and performance specifications of terminal products, and they do not have the same scale. Therefore, engineers must know how the product performance data is tested and determined, rather than being obtained from the data sheet.

In Europe, the current rating of the IEC scaled device is determined by detecting the temperature of the metal conductor when the current is increased. When the metal pin temperature is 45 °C higher than the ambient temperature, the measuring staff will use the current at this time as the rated current. Or the maximum current value, and also delineate 80% of the maximum current as the allowable current value; the U-scale adopted in the United States is different from the current value delineated by the European IEC scale, and the UL scale will make the metal conductor temperature 30 °C higher than the ambient temperature. 90% of the current value is the current nominal value of the device. Although the scale is different, it can be seen that the temperature of the metal conductor department is still very important in the application, and the industrial equipment usually needs to work in the high temperature environment of 80 ° C. If it is 30 ° C or 45 ° C higher than the environment, then the wiring The temperature of the terminals will exceed 100 ° C. Some materials, such as compact package materials, may not meet the heat dissipation requirements, so the current must be much lower than the rated value when the terminals are used.

More and more companies are beginning to use terminals from different countries. To avoid causing too many disasters for product designers, you should first understand the differences between different scales used in different countries. For example, Europe uses nominal values ​​to measure The method is lower than the nominal value when designing the device in Europe.

Secondly, when selecting the aviation plug terminal, pay attention to the termination technology. Many termination technologies use the through-hole connection method. This connection method requires mechanical support to ensure the power layer embedded in the multilayer circuit board. Maintain solid electrical contact. In addition to paying attention to the connection method, pay attention to the type of pins that connect the terminals to the board. Usually, single-pin models are selected, but multi-pins are also provided. Multiple pins can be used to distribute current to the board more evenly. In the line, it can provide more reliable mechanical non-disorder, and can improve the firmness of welding.

Finally, the factor considered in the selection of the aviation plug terminal is the appearance factor, and the good appearance can have a good affinity for the user.