What is the future of shunt resistors? This is how ROHM sees it!
Latest update time：2021-09-02 19:24
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Resistors are the most commonly used components in various electronic products. As time goes by, electronic products have shown a trend of diversification, which has also prompted great changes in resistors. Among them, the most popular in the market are chip resistors, which account for 90% of the market share and are the mainstream resistor products.
From the perspective of the technical development trend of chip resistors, according to Rohm's statistics, the most widely used resistor in the world is still the 0402 package resistor, which is 1.0×0.5mm. This resistor, which Rohm first mass-produced in 1989, is still the most widely used resistor in the world. In addition, resistors such as 0201 and 0603 account for about 85% of the total shipments, which is also the main shipment volume at present.
In the field of chip resistors, the larger the package, the higher the power that the chip resistor can handle. But today's market is increasingly demanding smaller and smaller electronic product sizes, which means the demand for smaller components. The continuous reduction in the size of standard electronic components has resulted in higher power consumption in smaller PCB board space, so chip resistors must be able to handle higher power per square inch.
Wu Bo, senior engineer of the Technology Center of Rohm Semiconductor (Beijing) Co., Ltd., said: "At present, the demand for miniaturization is becoming more and more vigorous. The demand for 0201 and even smaller 01005 package resistors in the future has shown an increasing trend year by year. At the same time, the demand for 0603 resistors with larger packages will gradually decrease. From the overall market demand, it can be seen that miniaturization is an inevitable technological development trend."
Driven by the demand for miniaturized resistors, a number of new application scenarios have emerged, which also brings new challenges and development opportunities to resistors.
According to Wu Bo, most of Rohm's resistor sales come from the automotive market. At the same time, with the development trend of the market CASE (i.e. infotainment, autonomous driving, shared services, electrification), resistors must meet the needs of the automotive market for high-power resistors while meeting the needs of miniaturization. Among them, shunt resistors are widely used in automotive and industrial equipment for the purpose of detecting current, which also requires shunt resistors to develop in the direction of small size and high power.
In terms of shunt resistors, Rohm has launched a variety of product series to meet the needs of different vehicle-mounted scenarios. In 2006, Rohm released the world's first miniaturized metal plate shunt resistor, and then released the PSR series of high-power (3W, 4W, 5W) low-resistance (below 3 milliohms) resistors from 2014 to 2017. In addition, in 2017, Rohm released the first GMR100 series resistor of the GMR series resistors. The biggest advantage of the GMR series resistors is their good heat dissipation characteristics and low resistance temperature coefficient. Following the GMR100, Rohm launched the GMR50 series shunt resistors, which were the first in the world to achieve a power of 4W in the 5025 size, meeting the demand for resistors in the automotive market.
It is reported that the GMR50 resistor can not only save installation space in one step, but also provide stable current detection by changing the electrode structure and optimizing the component design. In addition, the GMR50 resistor body metal is made of high-performance alloy material, which also allows the resistor to provide high-precision current detection and improve reliability.
The device saves more space:
The small size of 5.0×2.5mm can ensure the industry-leading rated power of 4W when the pin temperature Tk＝90℃. Compared with the previous products of the same 4W, a smaller shunt resistor can be used, which can reduce the installation area by 39%.
Stable current detection:
Compared with ordinary products, this product has better durability against overcurrent loads. Even if an overcurrent exceeding the rated value flows through it, the change in its resistance value is very small, and stable current detection can be achieved. According to Wu Bo, "Through the overload comparison test of ordinary resistors and GMR50 resistors, when the power is gradually increased, the resistance change rate of the GMR50 resistor is still within 0.5% even when it is increased to 8 times, while the ordinary product has reached less than 2% at this time. In other words, even in the case of overload, the GMR50 resistor can ensure a very small resistance change rate, which can ensure very stable current detection."
High-precision current detection:
In the low resistance range, GMR50 also achieves an excellent resistance temperature coefficient. High-precision current detection helps to improve the reliability of the equipment. According to Wu Bo, "Generally speaking, the lower the resistance value, the higher the resistance temperature coefficient. The resistance temperature coefficient reflects the dependence of the resistor on temperature. The smaller the fluctuation requirement, the more accurate the actual detected value. Especially in some vehicles or some harsh environments, the temperature rise in the car is generally high, but it also has higher reliability requirements. Under such application conditions, the lower the resistance temperature coefficient and the less affected by the environment, the resistor can achieve higher-precision detection."
In addition, the heat dissipation design supported by ROHM is not only for single resistors, but also for the overall thermal simulation of the entire PCB board, so as to provide corresponding heat dissipation countermeasures. This is also the service that ROHM has always been able to provide, and it is also one of the advantages of ROHM resistors.
For the future, ROHM resistors' development strategy is to focus on the growing automotive market, with supply capacity and reliability as core competitiveness to ensure a stable position worldwide.
Specifically, in terms of shunt resistors, as the rated power of shunt resistors continues to increase, Rohm's GMR series resistors will increase their rated power to 10W in the future; the PSR series can be increased to 15W; and the PMR and LTR series resistors will also increase from the current 2W to 3W. In terms of high-reliability resistors, Rohm has two routes: one is to increase the rated power while keeping the package size unchanged; the other is to ensure that its surge resistance remains unchanged while adapting to miniaturization, or to improve its anti-sulfurization performance. These are Rohm's characteristics and advantages for the automotive market.
At the same time, in order to cope with the growing demand for resistors in the future automotive market, in June this year, Rohm also invested in the construction of a new factory at the Rohm factory in the Philippines to expand Rohm's product lineup and production capacity of high-power shunt resistors and high-reliability resistors.
*Disclaimer: This article is originally written by the author. The content of the article is the author's personal opinion. Semiconductor Industry Observer reprints it only to convey a different point of view. It does not mean that Semiconductor Industry Observer agrees or supports this point of view. If you have any objections, please contact Semiconductor Industry Observer.
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