ROHM’s New 0603-Size LEDs Optimized for Low-Current Low-Light Applications
Contributes to improved visibility by reducing uneven brightness and color in indicators and numeric displays

 

November 10th, 2022

ROHM has recently announced the availability of 0603-size (0.6inch × 0.3inch) / 1608-size (1.6 mm × 0.8 mm) LEDs, CSL1901 series, optimized for low-light applications for use in indicators and numeric displays in Factory Automation equipment (i.e. PLCs) and communication control equipment such as modems and routers.

In recent years, technological advancements in LED elements have resulted in dramatically improved luminous efficiency – leading to increased brightness. At the same time, the market is demanding LEDs tailored to characteristics in the low current range. The reason: higher brightness makes it necessary to design for appropriate luminous intensity and emission wavelengths in applications where interference with adjacent light emitting parts must be considered.

ROHM has developed versatile 0603-size LEDs optimized for low-current drive in low-light applications by leveraging in-house element technology to customize the light-emitting layer of the device.

The CSL1901 series reduces visual variations in brightness and color under low-light conditions by optimizing element characteristics of light emission at 2mA using original device technology. In general, when operating standard LEDs, which guaranteed specification at 20mA, at low currents results in brightness and color differences that vary from part to part. Compared to existing products (at 2mA), ROHM’s new LEDs reduce brightness variations by half and color sifting by 3nm, minimizing design man-hours required for light emission while improving visibility in indicators and numeric displays. Furthermore, a lineup of five colors is offered in the highly versatile 0603 size – facilitating replacement due to application and model changes.

Going forward, ROHM will continue to offer LEDs that meet customer needs while improving application design and reducing development load.

CSL1901 series
  • Online Distributors
  • Digi-Key
    Mouser
    Farnell
 
Comparing the CSL1901 Series with Standard Products at 2mA
Applications Using Multiple LEDs

Product Lineup

Part No.Data SheetEmitting ColorAbsolute Max. Ratings (Ta=25°C)Electrical and Optical Characteristics (Ta=25°C)Package Size [inch] (mm)
Forward
Current
IF
[mA]
Operating
Temperature
Topr
[°C]
Forward Voltage
VF
Typ.
[V]
 Dominant Wavelength
λD
Typ.
[nm]
 Luminous Intensity
IV
Forward
Current
IF[mA]
Forward
Current
IF[mA]
Min.
[mcd]
Max.
[mcd]
Forward
Current
IF[mA]
CSL1901VWPDFRed20-40 to
+85
1.8263021.66.320.6 × 0.3
(1.6 × 0.8)
CSL1901UWPDFRed6202.510.0
CSL1901DWPDFOrange6056.325.0
CSL1901YWPDFYellow5906.325.0
CSL1901MWPDFYellow Green5701.04.0

Target Applications

・ Indicators and numeric displays in a variety of applications
- FA (Factory Automation) equipment (PLC and other control devices)
- Machine tools, manufacturing/inspection equipment
- Communication control devices such as modems and routers

Sales Information

Pricing: $0.139/unit (samples, excluding tax)
Availability: Now (in mass production)
Available for purchase through online distributors Digi-Key, Mouser, and Farnell.

Terminology

PLC (Programmable Logic Controller)
A computer device that uses programs to control sequences and give commands to input/output devices. It is often utilized in automatic control equipment in factories and for various machine controls.
FA (Factory Automation)
Equipment designed for automation in factories.
Luminous Intensity
Indicates the brightness when viewed from a certain direction by specifying the amount of light per unit solid angle. The unit is cd (candela).
Emission Wavelength
In general, LEDs are expressed in terms of wavelength corresponding to colors seen by the eye. Also referred to as the dominant wavelength, with units of nm (nanometers).

 
Dominant Wavelength Range

Leaflet

Low 2mA drive current optimized for low-light applications
1608 size Low Current LEDs (PDF:1.2MB)


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