LCD Character Display Module 104990002 - Equivalent & Substitute Parts

Part Overview

The Seeed Technology 104990002 is a 20x4 character LCD display module featuring an 80-character STN (Super-Twisted Nematic) transmissive display with white LED backlight. This module is designed for parallel 8-bit interface applications requiring alphanumeric character display in industrial and embedded system environments.

The 104990002 is classified as obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems currently utilizing this display module.

Substiute Parts

104990002

Seeed Technology Co., LtdIn Stock: 1114104990002 Datasheet

Current PartRFQ

NHD-0420DZ-FSB-GBW

Newhaven Display IntlIn Stock: 920NHD-0420DZ-FSB-GBW Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 104990002 is determined by the following critical parameters that must align with the original specification:

Core Compatibility Parameters:

• Display format: 20 x 4 character configuration (80 total characters)
• Character matrix: 5 x 8 dot format
• Display technology: STN (Super-Twisted Nematic) LCD
• Interface protocol: Parallel 8-bit communication
• Operating temperature range: -20°C to 70°C minimum
• Supply voltage compatibility: 4.5V to 5.5V operating window
• Physical form factor: Outline dimensions within tolerance of 98.00mm x 60.00mm x 13.70mm

The substitute part NHD-0420DZ-FSB-GBW meets these core compatibility requirements. While the substitute exhibits differences in display mode (transflective versus transmissive) and backlight color (blue versus white), these represent functional enhancements rather than incompatibilities. The transflective display mode provides superior visibility in variable lighting conditions compared to transmissive-only operation. The substitute maintains identical character resolution, interface protocol, and thermal operating envelope.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: NHD-0420DZ-FSB-GBW

The NHD-0420DZ-FSB-GBW is the qualified substitute for the obsolete 104990002. Selection rationale is based on the following engineering factors:

Product Status Alignment: The substitute maintains active production status with Newhaven Display International, ensuring long-term availability and supply chain continuity. The original 104990002 is classified as obsolete, creating supply risk for new production builds and field replacements.

Regulatory Compliance: The substitute is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components in industrial applications. This compliance status supports integration into systems subject to modern procurement standards.

Electrical Compatibility: The substitute operates within a 4.5V to 5.5V supply range, which encompasses the original 4.7V to 5.3V specification. This expanded voltage tolerance provides improved operational margin in systems with variable power supply characteristics.

Mechanical Form Factor: The substitute dimensions of 98.00mm x 60.00mm x 14.00mm represent a 0.30mm increase in height compared to the original 13.70mm specification. This variance is within typical mechanical tolerance for display module mounting in standard 20x4 LCD enclosures and does not preclude direct substitution in most applications.

Functional Equivalence: Both modules employ identical 20x4 character display format, 5x8 dot matrix resolution, STN display technology, and parallel 8-bit interface protocol. Operating temperature ranges are identical at -20°C to 70°C.

Display Mode Enhancement: The substitute employs transflective display technology compared to the original transmissive mode. Transflective operation provides superior visibility across variable ambient lighting conditions, including low-light and high-brightness environments, while maintaining full compatibility with 8-bit parallel interface control.

Frequently Asked Questions (FAQ)

Q: Can the NHD-0420DZ-FSB-GBW directly replace the 104990002 in existing designs?

A: Yes. Both modules share identical character display format (20x4), character matrix resolution (5x8 dots), display technology (STN), and interface protocol (parallel 8-bit). The substitute operates within the original supply voltage specification and maintains the same operating temperature range. The 0.30mm height variance is within standard mechanical tolerance for LCD module mounting.

Q: What is the difference between transmissive and transflective display modes?

A: Transmissive displays (104990002) rely exclusively on backlight illumination for character visibility. Transflective displays (NHD-0420DZ-FSB-GBW) combine backlight illumination with ambient light reflection, enabling character visibility in both low-light and high-brightness environments without backlight operation. This represents a functional enhancement for applications requiring variable lighting conditions.

Q: Are there electrical interface differences between these modules?

A: No. Both modules employ parallel 8-bit interface protocol. The substitute operates within a 4.5V to 5.5V supply range, which encompasses the original 4.7V to 5.3V specification. No interface signal modifications are required for substitution.

Q: Does the backlight color change from white to blue affect system operation?

A: Backlight color is a visual characteristic that does not affect electrical interface, control protocol, or character display functionality. The blue backlight of the substitute provides different visual appearance compared to the white backlight of the original. System firmware and control logic require no modification.

Q: What is the significance of the substitute's ROHS3 compliance?

A: ROHS3 compliance indicates the substitute meets current European Union Restriction of Hazardous Substances regulations, restricting lead, mercury, cadmium, and other hazardous materials. This compliance status is required for components integrated into systems subject to modern procurement standards and environmental regulations. The original 104990002 compliance status is not specified.

Q: Is the 0.30mm height difference significant for mechanical integration?

A: The 0.30mm height variance (14.00mm versus 13.70mm) is within standard mechanical tolerance for LCD module mounting in enclosures designed for 20x4 character displays. This variance does not preclude direct substitution in standard mounting configurations. Verify specific mechanical constraints in applications with tight height restrictions.

Q: What is the inventory status of these parts?

A: The original 104990002 has 1099 units in stock as new original inventory. The substitute NHD-0420DZ-FSB-GBW has 902 units in stock as new original inventory. Both parts are available for immediate procurement.