Precision resistor is the basic unit in electronic components of aerospace equipment. The reliability of precision resistance is the basis of ensuring the reliability of aerospace equipment.
Due to its function, performance, quality and development progress, some imported precision resistors are selected for aerospace equipment. At present, there are some problems in the use of imported precision resistors in aeronautical and spaceflight equipment.

1. Potential safety hazard when imported precision resistors applied to aeronautics and astronautics
The use of imported precision resistors may be artificially implanted in the design, manufacturing, packaging, testing, etc., such as the IP core may be embedded in the back door, mask making and high-end packaging can also be implanted into the back door. These backdoors can steal the data of aerospace equipment and even destroy the equipment, and may further spread viruses and Trojan horses through the network, seriously affecting the information security of aeronautics and spaceflight. As in 2010, Germany discovered the first destructive virus specifically targeted at industrial control system chips.
 
2. Difficulties in supply support of imported precision resistor applied to aerospace equipment
With the development of new technology and new technology, the cycle of precision resistance renewal is shortened. Take integrated circuits for instance, according to Moore's law, the size is halved every 18 months, and integration is doubled. Due to the upgrading of components and the merger and reorganization of foreign manufacturers, the shutdown of components has brought great difficulties to the maintenance and production of many aerospace equipment that have been in service and are still in production. Take the United States as an example, formulated strict policies and related measures to limit high-tech and product exports.


3. There may be quality risks in imported precision resistors
Due to a variety of objective factors, aerospace equipment used part of the industrial components, most of these industrial components purchased through agents, unable to obtain the relevant quality documents, individual components have been discontinued or even refurbished parts. At the same time, some large scale integrated circuits do not have the corresponding testing means in China.
Therefore, the performance parameters and reliability levels of some imported precision resistors can only be tested with the equipment, and can not be detected and screened in advance, which may lead to abnormal parameters and early failure in the use of the equipment. The quality risk of imported precision resistance has seriously affected the development, production and quality assurance of aerospace equipment.

 
With the increasingly severe situation of imported electronic components, the localization control of electronic components becomes more and more important. The quantitative index requirements of specification ratio and quantity ratio are put forward for the use of imported electronic components. The quantitative index requirements of specification ratio and quantity ratio are put forward for the use of imported electronic components. For example, many countries, in the use of precision resistors, require the technology to be controlled locally and the resistance model that can be mass-produced can be applied to the aerospace field.