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ROHM Industry’s Highest Rated Power Shunt Resistors in the 0508 Size: Contributes to Greater Miniaturization

2022-12-08 | Return

○ Lineup also expanded to include 2 updated general-purpose MCR series shunt resistors

ROHM has recently developed wide terminal shunt resistors, LTR10L. They are optimized for a variety of applications in the automotive, industrial, and consumer sectors, while also strengthening its considerable lineup with two updated general-purpose MCR series shunt resistors (MCR10L and MCR18L).

In recent years, high efficiency operation is required from the viewpoint of energy conservation – not only in battery-driven applications such as mobile devices and EVs, but in consumer and industrial equipment as well powered by electrical outlets. For high efficiency, it is important to accurately detect parameters such as current and voltage in order to operate devices optimally. This requires shunt resistors that combine high accuracy with high reliability current detection. At the same time, manufacturers of applications utilizing higher board densities are demanding even smaller shunt resistors. To meet these needs, the new LTR10L series delivers the industry's highest rated power and best-in-class temperature coefficient of resistance (TCR) in a compact 0508-size (0.5inch × 0.8inch) / 1220-size (1.25mm × 2.0mm) that contributes to both high reliability and greater miniaturization.

Improving the resistive element material and applying terminal temperature derating method allowed LTR10L to deliver an industry-leading 1W rated power in the 0508-size - 88% smaller than existing products. In addition, high-accuracy ±0.5% resistance tolerance has been achieved, together with best-in-class TCR and anti-sulfuration characteristics. These features make them ideal for applications exposed to harsh conditions, including telecommunication base stations requiring high durability and automotive LED headlamps that demand high accuracy current sensing along with long-term reliability. On the other hand, the MCR10L and MCR18L series of general-purpose shunt resistors utilize an improved element structure and materials to increase rated power to 0.5W and 0.75W, respectively, over their conventional MCR series rated power (0.25W). Higher rated power enables the same performance in a smaller size, contributing to product miniaturization.

Going forward, ROHM will continue to expand its lineup of resistors (its founding products) that leads to improved miniaturization and reliability while striving to ensure long-term stable supply.

LTR10L Lineup and Features

● LTR10L Features
LTR10L is a 0508-size (0.5inch × 0.8inch) / 1220-size (1.25mm × 2.0mm) model with an industry-leading rated power of 1W. The lineup includes high accuracy (D Class) products that provide a resistance tolerance of 0.5% along with class-leading TCR, making them ideal for automotive LED headlamps and other applications requiring high accuracy current detection. At the same time, high sulfuration resistance enables suitability with telecommunication base stations requiring long-term reliability even when operating continuously in harsh outdoor environments and automotive powertrain where sulfuration from exposure to exhaust gases is a concern.

● LTR10L Lineup

Part No.	Data Sheet	Size inch [mm]	Rated Power [W] (Rated Terminal Temperature: 125°C)	Resistance Tolerance



LTR10L	PDF	0508 [1220]	1.0	J (±5%) F (±1%)
				D (±0.5%)
Temperature Coefficient of Resistance TCR [ppm/°C]	Resistance Range		Operating Temperature Range [°C]	Automotive Grade AEC-Q200
0 to +150	33m to 180mΩ (E24series)		-55 to +155	YES
0 to +100	200m to 910mΩ (E24series)
0 to +150	100m to 180mΩ (E24series)
0 to +100	200m to 910mΩ (E24series)

MCR10L / MCR18L Lineup and Features

● MCR10L / MCR18L Features
The MCR10L (0.5W rated power) and MCR18L (0.75W rated power) are low-resistance models in the general-purpose MCR series. Power rating is not only significantly improved, but TCR as well compared with the conventional 0.25W rated MCR10 and MCR18. Additional updates include a revised element structure and materials that increase performance and allow us to continue to ensure stable supply.

● MCR10L / MCR18L Lineup

Part No.	Data Sheet	Size inch [mm]	Rated Power [W] (Rated Ambient Temperature: 70°C)	Resistance Tolerance
MCR10L	PDF	0805 [2012]	0.5	J (±5%) F (±1%)
MCR18L	PDF	1206 [3216]	0.75	J (±5%) F (±1%)
Temperature Coefficient of Resistance TCR [ppm/°C]	Resistance Range		Operating Temperature Range [°C]	Automotive Grade AEC-Q200
0 to +250	47m to 110mΩ (E24series)		-55 to +155	YES
0 to +150	120m to 910mΩ (E24series)			YES
0 to +250	47m to 91mΩ (E24series)			YES
0 to +150	100m to 910mΩ (E24series)			YES

Application Examples
The new products are ideal for a wide range of circuits requiring current detection for motors, batteries, and LCDs in the automotive, industrial equipment, and consumer device sectors

Online Sales Information
○ Pricing: $0.6/unit (samples, excluding tax)
○ Availability: Now (in mass production)

These three series are offered in the following resistance values. (All units in mΩ) Additional resistance values will be added as needed.

Part No.	LTR10L	MCR10L	MCR18L
Resistance (mΩ)	75, 160, 200, 240, 270	47, 100, 200, 220, 270, 300, 330, 470, 510	100, 220, 300, 390, 470

Support Page
Product pages can now be searched by series or resistance value, and samples are available for purchase.
https://www.rohm.com/products/resistors

Terminology

● Terminal Temperature Derating
Whereas conventional derating sets the ambient temperature of the component as the criterion for load reduction, ROHM’s new products use terminal temperature to calculate load reduction.
● TCR (Temperature Coefficient of Resistance)
TCR is a change in electrical resistance with respect to per degree of temperature (ppm/°c). The lower this value, the less resistance change with a change in ambient temperature. Low TCR makes it possible to suppress variations during device operation.

Leaflet
● Class-leading* 1W rated power in the 1220 size High Power Wide Terminal Thick-Film Shunt Resistors LTR10L (PDF:900KB)
● New MCR series shunt models significantly increase rated power General-Purpose Low Resistance · High Power Shunt Resistors MCR10L/MCR18L (PDF:1MB)

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Source: https://www.rohm.com