ROHM News Detail

ROHM Industry’s Highest Rated Power Shunt Resistors in the 0508 Size: Contributes to Greater Miniaturization
Lineup also expanded to include 2 updated general-purpose MCR series shunt resistors

*ROHM December 8, 2022 study

December 8th, 2022

LTR10L

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.

ROHM Shunt Resistor Lineup Chart
Mounting Area Comparison of New Product

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.

TCR Comparison: LTR10L vs Standard Products
Sulfuration Performance Comparison: LTR10L vs Conventional Products

● LTR10L Lineup

Part No.Data
Sheet		Size
inch
[mm]		Rated Power
[W]
(Rated Terminal
Temperature: 125°C)		Resistance
Tolerance		Temperature Coefficient
of Resistance
TCR [ppm/°C]		Resistance RangeOperating
Temperature
Range [°C]		Automotive
Grade
AEC-Q200
NewLTR10LNew0508
[1220]		1.0J (±5%)
F (±1%)		0 to +15033m to 180mΩ (E24series)-55 to +155YES
0 to +100200m to 910mΩ (E24series)
D (±0.5%)0 to +150100m to 180mΩ (E24series)
0 to +100200m 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.

TCT Comparison: MCR10L/MCR18L vs Conventional Products

● MCR10L / MCR18L Lineup

Part No.Data
Sheet		Size
inch
[mm]		Rated Power
[W]
(Rated Ambient
Temperature: 70°C)		Resistance
Tolerance		Temperature Coefficient
of Resistance
TCR [ppm/°C]		Resistance RangeOperating
Temperature
Range [°C]		Automotive
Grade
AEC-Q200
NewMCR10LNew0805
[2012]		0.5J (±5%)
F (±1%)		0 to +25047m to 110mΩ (E24series)-55 to +155YES
0 to +150120m to 910mΩ (E24series)
NewMCR18LNew1206
[3216]		0.75J (±5%)
F (±1%)		0 to +25047m to 91mΩ (E24series)YES
0 to +150100m to 910mΩ (E24series)

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)
Online Distributors: Digi-Key, Mouser, and Farnell
These three series are offered in the following
resistance values. (All units in mΩ)
Additional resistance values will be added as needed.

Online Distributors

  • Digi-Key
  • Mouser
  • Farnell

 

Part No.LTR10LMCR10LMCR18L
Resistance
(mΩ)		75, 160, 200, 240, 27047, 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)