Yellow 40x2 Character Standard LCD

Part Number: CFAH4002A-YYH-JT

Standard 40x2 Character LCD – Dark On Yellow-Green

If you need to display a lot of information on your device, this extra wide LCD will do the job with an active area of 5.8-inches (147.50 millimeters). Like all transflective displays, the 5x8 character matrix on this 40 x 2 LCD screen can be read in direct sunlight, is good for typical office lighting, and is easy to read in dark locations. One of our customers bought a display in the CFAH4002A series to use in an environmental control system for irrigation management.

Key Features

  • 2 lines with 40 characters each, industry standard 40x2 form factor
  • The built-in alphanumeric set supports Japanese and English text
  • Built-in Sitronix ST7066U or compatible controller.
  • Sunlight readable
  • Adjust backlight contrast by using PWM (Pulse Width Modulation)

As with other standard character displays, the parallel interface communicates with your host using 4-bit or 8-bit mode. The built-in Sitronix ST7066U controller is compatible with the industry standard Hitachi HD44780 controller. Software written for the HD44780 should work without any changes. For controller details, see the Sitronix ST7066U datasheet on our website.

Our goal is to keep every product available as long as possible. We've sold the CFAH4002A series since 2008 and it is still going strong. The yellow-green LED backlight on this STN (Super-Twisted Neumatic) display module is rated to operate continuously for up to 17 years! A simple current limiting resistor in line with the voltage source works well in most applications. The yellow-green LEDs do not demand a current source, although one may be used. For details, see the backlight section starting on page 22 of the datasheet.

Need more information? Our in-house Technical Support team will answer your interface and connection questions.

Quantity Price
1 $26.82
5 $24.75
10 $21.80
20 $21.16
50 $20.39
100 $20.14
200 $20.01
300 $18.90
500 $18.77
1000 * $17.35
* Pricing is subject to change. Contact us about potential lead times.
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Physical Characteristics

Characters x Lines 40 x 2
Module Overall width height depth
millimeters 182 33.5 13.6
inches 7.165 1.319 0.535
PCB Outline width height depth
millimeters 182 33.5 13.6
inches 7.165 1.319 0.535
Diagonal Dimension 5.82"
Viewing Area width height
millimeters 154.4 16.5
inches 6.079 0.650
Active Area width height
millimeters 147.5 11.5
inches 5.807 0.453
Character Size width height
millimeters 3.2 5.55
inches 0.126 0.219
Character Pitch width height
millimeters 3.7 5.95
inches 0.146 0.234
Dot Size width height
millimeters 0.6 0.65
inches 0.024 0.026
Dot Pitch width height
millimeters 0.65 0.7
inches 0.026 0.028
Weight 92g
Pin Count 16

Optical Characteristics

Glass Type/Glass Color STN/Yellow-Green
Polarizer Transflective
View Direction 6 o'clock
Sunlight Readable Yes
Backlight Color Yellow-Green
Backlight Type LED
Mode Positive
Foreground Color Dark
Background Color Yellow-Green

Electrical Specifications

Module Connector Pitch 0.1mm


Operating Temperatures min max
Celsius -20° 70°
Fahrenheit -4° 158°
Storage Temperatures min max
Celsius -30° 80°
Fahrenheit -22° 176°
Humidity min max
Non-condensing 0% 90%


Controller Documents Sitronix ST7066U
Dot Matrix LCD Controller/Driver
Interface 4-bit Parallel, 8-bit Parallel
For reference only. For design purposes, please use the specifications in the datasheet.