20x4 Character LCD STN Transflective - MCU
- 💹 Enjoy a 20% discount for orders over 500
- 📉 A 15% discount is available for orders ranging from 200 to 499
- 🎁 A 10% discount is available for orders ranging from 50 to 199
- 🎁 A 5% discount is available when ordering 10-49
Interested in customizing this product? Get in touch with us.
Order samples, immediate delivery.
Factory bulk lead time: 3 weeks.
20x4 Character LCD STN Transflective - MCU
- 💹 Enjoy a 20% discount for orders over 500
- 📉 A 15% discount is available for orders ranging from 200 to 499
- 🎁 A 10% discount is available for orders ranging from 50 to 199
- 🎁 A 5% discount is available when ordering 10-49
Resources & Downloads
20×4 Character LCD STN Transflective - MCU
DM-LCD2004-440 is a 20-character by 4-line LCD module for embedded text-display applications. It uses STN positive yellow-green transflective display technology, a yellow-green LED backlight, and an ST7066U controller IC.
The module is specified for a 5.0V supply, 6800 series MPU interface, 6:00 viewing direction, and a mechanical outline of 77.0 ±0.5 mm width, 47.0 ±0.5 mm height, and 12.4 mm maximum thickness.
Verified Technical Specifications
The values below are written from the provided product information and DM-LCD2004-440 engineering drawing details. Use the official datasheet and latest drawing revision before PCB layout, enclosure tooling, or production approval.
Data Use Note
No unsupported touch panel, certification, example code, STEP model, or reliability claim is added here. Project-specific requirements should be confirmed before ordering.
| Parameter | Specification |
|---|---|
| Product Model | DM-LCD2004-440 |
| Product Type | Character LCD module |
| Display Format | 20 characters × 4 lines |
| Display Mode | STN positive, yellow green, transflective |
| Viewing Direction | 6:00 |
| Module Outline | 77.0 ±0.5 mm width × 47.0 ±0.5 mm height; 12.4 mm max. thickness |
| Viewing Area | 60.0 × 22.50 mm |
| Active Area | 55.1 × 17.56 mm |
| Pin Header Layout | 16 holes, 2.54 mm pitch; 38.1 mm across 15 spaces |
| Pin Hole / Pad | 16-ø1.0 PTH / 16-ø1.8 PAD |
| Power Supply Voltage | 5.0V; specified range 4.5V to 5.5V |
| Supply Current, Logic | 1.0mA min., 1.2mA typ., 1.5mA max. |
| Backlight Type | Yellow green LED |
| Backlight Voltage | 3.9V min., 4.2V typ., 4.4V max. |
| Backlight Current | 144mA min., 180mA typ., 216mA max. |
| Interface | 6800 series MPU interface |
| Controller IC | ST7066U |
| Operating Temperature | -20°C to +70°C |
| Storage Temperature | -30°C to +80°C |
| Weight | 37.4g |
| View Angles | Top 20°, bottom 40°, left 30°, right 30° |
| Response Time | 300ms typ., 400ms max. |
| Contrast Ratio | 3 typ. |
| Luminance, Backlight Only | 240 cd/m² typ. |
Electrical and Optical Review
The 5.0V logic supply, typical 1.2mA logic current, and typical 180mA backlight current should be checked together during power-budget planning. The 240 cd/m² typical backlight-only luminance, 300ms typical response time, and 3 typical contrast ratio provide reference values for sample evaluation.
Mechanical Drawing Guidance
The drawing should be used to check the module outline, viewing area, active area, pin header position, mounting clearance, and backlight depth before enclosure tooling or front-panel design.
For the 16-pin header area, the drawing lists 2.54 mm pitch, 38.1 mm across 15 spaces, 1.0 mm plated through holes, and 1.8 mm pads. Confirm mating header selection and assembly clearance before PCB release.
Mechanical Values to Verify
Controller and Interface Notes
The module uses an ST7066U controller IC with a 6800 series MPU interface. The product information lists 4-bit or 8-bit MPU operation, allowing engineers to review host I/O usage and timing requirements during schematic design.
Bus Selection
Use 4-bit operation when host I/O count is limited, or 8-bit operation when the design allows a wider parallel data path.
Power Stability
Keep the 4.5V to 5.5V supply stable during initialization and display operation.
Host Level Matching
When using a 3.3V host, review level matching before connecting the module to the MCU interface.
Application and Ordering Notes
This module can be evaluated for industrial panels, instruments, test equipment, embedded status displays, and other products that need fixed-format alphanumeric information rather than a full graphic user interface.
Is this a character LCD?
Yes. It is a 20-character by 4-line LCD module for text, numeric, menu, and status-code display.
Is touch included?
No touch panel or touch controller is specified in the provided product information.
What should be checked before PCB layout?
Review the 16-pin header layout, MCU bus mode, power supply range, backlight current, and initialization requirements.
What should be checked before mechanical release?
Confirm module outline, viewing area, active area, thickness, mounting clearance, and front-window alignment using the official drawing.
Download Official Technical Documents
Use the official datasheets to confirm dimensions, electrical ratings, interface details, controller information, mechanical drawing data, and integration requirements before sample evaluation or production planning.