40x2 character lcd display module cob display — A 40 character by 2 line character LCD module in FSTN and COB construction with an HD44780 compatible controller, driven over a 6800 series 8-bit or 4-bit MPU interface for wide status panels and rack equipment.
Specifications
| Model | MLC402Y-1 |
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| Format | 40 characters x 2 lines |
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| Build | COB |
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| Controller | HD44780 compatible (SPLC780D or equivalent) |
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| Display mode | FSTN |
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| Interface | 6800 series, 8-bit / 4-bit MPU |
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| Viewing direction | 6 o'clock |
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| Backlight | White / Yellow LED |
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| Operating temperature | -20 to +70 degree |
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| Storage temperature | -30 to +80 degree |
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Compare with nearby character LCD sizes
| Format | Controller | Interface | Backlight |
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| 20 x 4 | HD44780 compatible | 6800, 8-bit / 4-bit | White / Yellow LED |
| 40 x 2 | HD44780 compatible | 6800, 8-bit / 4-bit | White / Yellow LED |
| 40 x 4 | HD44780 compatible | 6800, 8-bit / 4-bit | White / Yellow LED |
FAQ
Why does the 40x2 have two enable pins?
A single HD44780 style controller drives 80 characters, so a 40 x 2 display is built as two halves of 40 characters, each with its own enable line, E1 and E2. Firmware selects which half it is writing to by toggling the matching enable.
Can a 40x2 be driven from an Arduino?
Yes, in 4-bit mode with both enable lines wired to GPIO pins. The standard LiquidCrystal library only handles one enable, so a small wrapper or a library that supports two controllers is used.
Is the 40x2 pin compatible with a 20x4?
No. The 40x2 has a wider outline and uses two enable lines rather than one, so it is not a drop-in swap even though both use the character LCD command set.
Is the 40x2 suitable for rack mount equipment?
Yes, the wide format suits rack panels where two long status lines are needed. Bezel and mounting options are available on request.
The 40x2 keeps the single-controller, standard 16-pin layout of the smaller sizes. The full pin table is in the Character LCD Pinout Guide.
