Precise resistance: tough application's first choice
                                                                          Release time ：2007-03-24

   For automotive, industrial machinery, and telecommunications equipment is concerned, sophisticated electronic system is its continuous improvement of key performance. So to withstand harsh environment test of precise resistance demand is increasing.

The car electronics industries, precise resistance to car about safety and fuel economy meets emission regulation requirements and are of vital importance. And, because control key automotive parts of the electronic control system be compressed into more and more small range, placed under the hood and around and transmission system inside the body and many places, so relevant components such as induction resistor etc, need to be able to resist increasing pressure of work and has a high temperature and water or humid environment work normally under high wetness resisting sexual.

In the industrial control system application, long time running need stability resistance and high pulse load capacity. In addition, telecom infrastructure equipment such as cellular base station, usually deployed in remote areas, the environmental conditions are different, to avoid maintenance personnel for check brought about by the high cost of components reliability is extremely important.

Technology development improve reliable durability

The current precision SMD resistor generally can withstand ℃ temperature, maximum 155 power rating processing power usually prescribed in 70 ℃. Resistance rated 1/8w when in more than P70 linear is degressive. And with the continuous improvement of production technology, the latest generation of precise resistance has even can withstand ℃, the highest 175 ℃ high-power processing power as much as 85.

Through the whole process of self-control, manufacturers strictly to produce have precise performance, reliable durable SMD resistor. For example the Wisconsin has established a comprehensive control scheme to ensure repeatability, and its Draloric/Beyschlag film SMD resistor product has passed the comprehensive test procedures, including validation of EN140401-801,2.1. According to the comprehensive pulse load 2.2, thereby in early screening potential risks exist without fault the product.

Precise resistance need in severe conditions, so can work through Q200 AEC - CECC, EN and IEC and standards of such harsh authentication appears very important.

In addition to closely monitors the process of production, Wisconsin, further optimized component structure is developed coping of severe environment protective technology enables new resistance even in the bad environment, still can show higher stability. If the TNPW e3 series Wisconsin high stability precision SMD resistor can undergo 85% of relative humidity, high temperature environment in the last minute, in P70 resistance change by 1,000 hours later, the changes in the initial resistance within 0.05%. These components even with moisture infiltration also stable in 85 ℃ / 85 percent relative humidity case 1,000 hours later, resistance changes in 0.25% inside.

In need of multiple resistance accurately match situations, such as inspection application or precision amplifiers, precision patch arrays resistance can also provide very good help. The 0612 series ACAS Wisconsin network resistors encapsulation small in size, therefore suitable for high-density circuit design, but also reduce the assembly costs. Moreover, the increase of design flexibility can also enables designers benefit, because in the same patch arrays to the realization of different resistance, minimum resistance and maximum resistance can be as high as the ratio between the 1:20.

Through the industry standard of quality authentication

For automotive and telecom market system developers, they need to verify precise resistance can work in severe conditions, so the products can pass demanding standards, for example Q200, AEC - CECC, EN and IEC appear very important.

The IECQ has authentication through advanced test - CECC to ensure quality electronic components with satisfactory results, accord with professional electronic equipment, and the requirements for film SMD resistor of short-term and long-term test requirements for detailed regulations, for example EN 140401-801. This certification through independent third party external agencies to regularly review to ensure that standards are met. Fixed limit CECC part of authentication acceptance standard, so make sure the products are used in the period to keep very high quality standards. Regular repeated CECC test also ensures the unity of high quality. After CECC certified products can be in data sheets, labels and product packaging CECC mark. Mark

Q200 automobile electronics association AEC - documents such as Q200 AEC - for used in automobile industry, the resistance and other passive components is very important. Q200 AEC - including various kinds of electronic and climate test and test intensity level, but not including independent producers usually need stability requirement. Various testing methods and content of testing to ensure the quality of a component in different aspects, through testing, especially demanding the humidity level test strength test.

Production meets all the above requirements resistance and not only lies in the design the right components, increasing the processing technology and equipment, to optimize product quality also have a decisive role.