Source: ROHM Author: ROHM

    Shanghai, China, April 8, 2025 - Global semiconductor manufacturer ROHM (headquartered in Kyoto City, Japan) today announced the launch of the new AEC-Q100*1 compliant high-precision current detection amplifiers "BD1423xFVJ-C" and "BD1422xG-C". The "BD1423xFVJ-C" in the TSOP-B8J package supports an input voltage of +80V, and is suitable for high voltage environments such as 48V power-driven DC-DC converters, redundant power supplies, auxiliary batteries, and electric compressors. According to its gain setting, it can be divided into three models: "BD14230FVJ-C", "BD14231FVJ-C" and "BD14232FVJ-C". The "BD1422xG-C" in a small SSOP6 package supports an input voltage of +40V, making it ideal for space-saving on-board equipment such as current monitoring and protection (overcurrent detection) in 5V/12V driven power networks in the body and drive control unit. According to its gain Settings, it can be divided into three models: "BD14220G-C", "BD14221G-C" and "BD14222G-C".

    Current detection amplifier is an amplifier used to measure circuit current indirectly. Its role is to amplify the tiny voltage drop generated by the shunt resistor *2 and convert it into a measurable voltage signal for applications such as system control and monitoring.
    The new product integrates the previous op-amp + discrete device op-amp circuit mode to save space, and can detect current only by connecting the shunt resistor. In addition, the new product uses a two-stage amplifier structure, the input stage uses a chopper amplifier *3, and the post-stage uses a self-stabilized zero amplifier *4. By matching a resistor inside the IC to determine the gain accuracy, it can not only suppress the influence of temperature changes, but also achieve a high precision and stable current detection of ±1%.
    In addition, even with an external RC filter circuit for noise suppression, the new product can maintain current detection accuracy, helping to reduce design time. Not only that, it also has negative voltage tolerance of up to -14V, and supports reverse voltage, reverse voltage and negative voltage inputs. The +80V input voltage is also added to the product lineup to support 48V power supplies for applications such as electric vehicles (XEVs) to meet the diverse needs of in-vehicle applications.

    The new product has been temporarily put into mass production in February 2025 at the scale of 100,000 units per month (sample price 450 yen/piece, excluding tax). The production base of the previous process is ROHM Hamamatsu Co., Ltd. (Hamamatsu City, Japan), The production facilities for the latter process are ROHM Integrated Systems (Thailand) Co., Ltd. (Thailand) and ROHM Electronics Philippines, Inc. (Philippines). The corresponding products can also be purchased from Ameya360, Oneyac, Sekorm and other e-commerce platforms. In addition, ROHM offers evaluation boards for customers to quickly evaluate application product designs. In the future, ROHM will continue to provide outstanding solutions that help improve the accuracy and reliability of on-board equipment.

< Development background >
    In recent years, with the popularity of electric vehicles, the automotive market has been increasing systems driven by 48V power supplies in addition to traditional 5V/12V power supplies. With the increasing function of various on-board applications, the demand for monitoring and control is strong, making high-precision current detection crucial. ROHM's on-board current detection amplifiers incorporate the advantages of analog technology accumulated over the years to meet the needs of the on-board market. The products not only have excellent resistance to negative and high voltages, but also achieve high-precision current detection, helping to improve the safety and reliability of on-board applications such as electric vehicles.

< Product lineup >

    ROHM also offers the current detection amplifier "BD1421x-LA" for industrial equipment applications.

< Application Example >
    ? "BD1423xFVJ-C" for 48V power system: redundant power supply, auxiliary battery, DC-DC converter, electric compressor, etc
    ? BD1422xG-C for the 5V/12V power system: Domain Control Unit (DCU), Electronic Control Unit (ECU), etc

< E-commerce Sales information >
    E-commerce platforms: Ameya360, Oneyac, Sekorm
    The new products will also be gradually sold on other e-commerce platforms.
    (Start date: From February 2025 onwards)

Product model:

＜Terminology interpretation＞
    *1) Vehicle specification standard "AEC-Q100"
    AEC, short for Automotive Electronics Council, is a joint effort between large automakers and large U.S. electronic component manufacturers to develop reliability standards for automotive electronic components. Q100 is a standard for integrated circuits (ics).

*2) shunt resistor
    Insert the current path in series and measure the resistance of the circuit current by measuring the potential difference between the two ends.

*3) Chopper amplifier
    An amplifier circuit used to suppress signal misalignment and noise to a minimum. It is mainly used to accurately amplify weak DC signals and low frequency small signals.

*4) Self-stabilized zero amplifier
    Amplifiers with automatic correction of offset voltages (unnecessary noise and errors) to improve signal accuracy. Repeated sampling and correction through the internal circuit suppresses the offset voltage even during operation. Ideal for measurement and signal processing applications that require very high accuracy.

【About ROHM（ROHM）】
    ROHM was founded in 1958, from the initial main product - resistor production, after more than half a century of development, has become a world-renowned semiconductor manufacturer. Rohm's corporate philosophy is: "We always put product quality first. No matter how difficult it is, it will continue to provide a large number of high-quality products for domestic and foreign users, and contribute to the progress and improvement of culture."
    Rohm's production, sales, research and development network is distributed all over the world. Products involve many fields, including IC, discrete components, optical components, passive components, power components, modules and so on. In the world electronics industry, Rohm's many high-quality products have been approved and praised by the market, and it has become a leading company in system IC and advanced semiconductor technology.

[About ROHM's business development in China]
    Sales network: In order to respond quickly and accurately to the requirements of the ever-expanding Chinese market, Rohm has built the same vertical integration system in China that integrates development, sales and manufacturing. As a characteristic of Rohm, we actively carry out sales activities of "close to customers" and strive to provide customers with thoughtful service. At present, there are 20 sales outlets in China, including Shanghai, Shenzhen, Beijing, Dalian, Tianjin, Qingdao, Nanjing, Hefei, Suzhou, Hangzhou, Ningbo, Xi 'an, Wuhan,    Dongguan, Guangzhou, Xiamen, Zhuhai, Chongqing, Hong Kong, Taiwan. And the distribution network is gradually being expanded.
    Technical Center: There are technical centers and QA centers in Shanghai and Shenzhen, and North China Technical Center in Beijing to provide technical and quality support. The technical center is equipped with development and design support staff who are proficient in various markets and can make technical proposals for customer needs in the form of integrated solutions from software to hardware. In addition, when something bad happens to the product, the QA center will respond to the complaint within 24 hours.
    Production base: In 1993, production plants were established in Tianjin (Rohm Semiconductor (China) Co., LTD.) and Dalian (Rohm Electronics Dalian Co., LTD.). Diodes, leds, laser diodes, LED displays and optical sensors are produced in Tianjin, and power modules, thermal printheads, contact image sensors and optical sensors are produced in Dalian. As the main production base of RoHM, we continuously provide high-quality products to China and abroad.
    Social contribution: Rohm is also committed to strengthening cooperation with many research institutions and enterprises at home and abroad, and actively promoting joint research and development activities. In 2006, it signed a framework agreement with Tsinghua University on the integration of industry and science, and actively launched the integration of industry and science on the development of advanced technology of electronic components. In 2008, Tsinghua University donated money to build the "Qinghua-Rohm Electronic Engineering  Museum", which was completed in April 2011. In 2012, Tsinghua University set up the "Tsinghua - ROM Joint Research Center", engaged in optical components, communication and broadcasting, biochips, SiC power device applications, non-volatile processor chips, sensors and  sensor network technology (structural facility health monitoring), artificial intelligence (machine health detection) and other joint research projects. In addition to Tsinghua University, Rohm has also conducted industry-academic cooperation with many well-known universities in  China, and has continued to produce fruitful results.
    Based on the technical strength and high quality and reliability accumulated over the years, Rohm will build a solid cooperative relationship with customers through a solid technical support and customer service system integrating development, production and sales. As an enterprise rooted in China, Rohm will make positive contributions to improving customer product strength, customer business development and China's energy conservation and environmental protection.