New LTR50 Series of Wide Terminal Low-Ohmic High Power Thick-Film Chip Resistors Delivers Industry-Leading TCR Characteristics
Contributes to improved reliability in current detection applications
Willich-Münchheide, Germany, December 13, 2018 – ROHM has recently announced the availability of a new lineup of high power wide terminal thick-film chip resistors (10-910mΩ) ideal for current detection in a variety of applications, including inverters, AC, and energy-efficient appliances.
(see figure 1)

A thorough review of the resistive material allowed ROHM to improve rated power to 2W in the compact 2550 size (2.5x5.0mm, t=0.55mm) – 4x higher than conventional short-terminal types – contributing to improved energy savings and greater miniaturization in high power applications. The new family is available in 48 values. In addition, optimization of the element structure makes it possible to achieve best-in-class TCR (temperature coefficient of resistance) characteristics among wide terminal thick-film chip resistors. The result is minimal resistance fluctuation due to temperature changes, enabling high accuracy current detection.

Recent years have seen a marked increase in the number of circuits used to monitor current in a variety of applications, spurring demand for current detection resistors for controlling and managing current. This significant growth in embedded components requires compact, high power resistors.

ROHM continues to lead the industry in product development, beginning with the world’s first chip resistors. For applications demanding reliability, ROHM offers resistors that provide features such as high power, anti-surge, and sulfuration resistance that have been well-received in the industry. Adding this new lineup of low-ohmic resistors enables support for a wider variety of applications. Going forward, ROHM will continue to leverage the latest, proprietary technologies and expertise to expand its industry-leading portfolio with products optimized to customer needs.

Low Ohmic Current Detection Resistor Selection Chart
(see figure 2)

Key Features
1. Superior temperature coefficient of resistance (TCR) ensures high accuracy current detection

Generally, TCR increases as the resistance decreases, but optimizing the resistive element structure allowed ROHM to achieve class-leading TCR characteristics. For example, in the case of 100mΩ, the LTR50 series delivers a TCR of ±100ppm/°C, ensuring stable resistance.
(see figure 3)

2. 4x higher rated power than conventional products contributes to greater space savings
A thorough review of the resistive material made it possible to improve rated power to 2W in the compact 2550 size (2.5x5.0mm, t=0.55mm) -- 4x higher ROHM’s conventional MCR50 low-ohmic series (0.5W). This allows customers to reduce set size by using smaller resistors.

(see table)

Temperature Coefficient of Resistance (TCR)

The internal resistance of many materials changes in response to variations in temperature. This rate of change is called the temperature coefficient of resistance, or TCR. The lower this value is, the less the resistance change due to a change in ambient temperature, making it possible to suppress variations during device operation.
About ROHM Semiconductor

ROHM Semiconductor is a global company of 397,106 million yen (3,65 billion US$) revenue per March 31th, 2018 with 23,120 employees. ROHM Semiconductor develops and manufactures a very large product range from the Ultra Low Power Microcontroller, Power Management, Standard ICs, SiC Diodes, MOSFETs and Modules, Power Transistors and Diodes, LEDs to passives components such as Resistors, Tantalum Capacitors and LED display units, thermal Printheads in state-of-the-art manufacturing plants in Japan, Korea, Malaysia, Thailand, the Philippines, China and Europe.
LAPIS Semiconductor (former OKI Semiconductor), SiCrystal AG, Kionix are companies of ROHM Semiconductor Group.
ROHM Semiconductor Europe has its head office near Dusseldorf serving the EMEA region (Europe, Middle East and Africa). For further information please contact
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Date: 13.12.2018 14:00
Number: 24_LTR50 EN
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