104990121 14-Segment Alphanumeric LED Display Module

Part Overview

The 104990121 is a 2-character, 14-segment alphanumeric LED display module manufactured by Seeed Technology Co., Ltd. This component features amber-colored LEDs in an 18-DIP package configuration, designed for applications requiring alphanumeric character display capabilities. The part is classified as obsolete, making identification of functionally equivalent substitutes essential for ongoing design support and component procurement.

The 14-segment display architecture enables full alphanumeric character representation, distinguishing it from 7-segment displays limited to numeric and basic character sets. The common cathode configuration requires positive voltage application to individual segment anodes for character illumination.

Substiute Parts

104990121

Seeed Technology Co., LtdIn Stock: 1196104990121 Datasheet

Current PartRFQ

EADCD054OA1

Everlight Electronics Co LtdIn Stock: 830EADCD054OA1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 104990121 is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Display Type: 14-Segment, Alphanumeric configuration
• Number of Characters: 2-character display
• Common Pin Configuration: Common Cathode
• Character Size: 0.54" (13.72mm)
• Package Type: 18-DIP (0.600", 15.24mm)
• Forward Voltage (Vf): 2V nominal
• Test Current: 20mA

Allowable Variation Parameters:

• Color: Amber or Orange (both within visible spectrum for alphanumeric applications)
• Brightness Rating (mcd): Variation acceptable within application tolerance
• Peak Wavelength: Variation acceptable within color family
• Physical Dimensions: Minor variations acceptable if package footprint remains compatible
• Power Dissipation: Variation acceptable if within thermal design limits
• Product Status: Active status preferred for ongoing availability

The EADCD054OA1 manufactured by Everlight Electronics Co Ltd qualifies as a substitute based on matching all mandatory parameters while varying in color specification (orange vs. amber) and brightness characteristics.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration: Product Status

The 104990121 is classified as obsolete. The EADCD054OA1 is actively manufactured and maintains current production status, ensuring long-term component availability and supply chain continuity.

Electrical Compatibility

Both parts operate at identical forward voltage (2V) and test current (20mA) specifications. The 18-DIP package pinout remains consistent, enabling direct PCB footprint compatibility without circuit redesign.

Optical Characteristics

The EADCD054OA1 exhibits a significant brightness reduction (12.5mcd vs. 105mcd). Applications requiring high luminosity for visibility in bright ambient conditions may experience performance degradation. Applications with controlled lighting environments or where lower brightness is acceptable proceed without modification.

The color shift from amber (603nm) to orange (621nm) represents a wavelength difference of 18nm. This variation falls within the visible spectrum and may affect visual appearance in applications where color consistency is critical for user interface design or brand standards.

Thermal Performance

Maximum power dissipation increases from 50mW to 60mW. Thermal design margins must accommodate this 20% increase. PCB thermal management and component placement should be evaluated if the original design operated near thermal limits.

Compliance and Certifications

The EADCD054OA1 carries ROHS3 compliance certification, meeting current environmental and hazardous substance restrictions. The original 104990121 compliance status is not specified in available documentation.

Mechanical Fit

Physical dimensions show transposition of height and width measurements (0.988" H x 0.835" W becomes 0.835" H x 0.988" W) and a depth reduction of 0.032" (0.335" to 0.303"). PCB layout and mechanical clearance must be verified to confirm accommodation of these dimensional changes.

Frequently Asked Questions (FAQ)

Q: Can the EADCD054OA1 directly replace the 104990121 without circuit modification?

A: Electrical compatibility is direct due to identical voltage, current, and package specifications. However, the brightness reduction and color shift require application-level evaluation. PCB mechanical clearance must be verified due to dimensional variations.

Q: What is the significance of the brightness difference between these parts?

A: The 104990121 provides 105mcd brightness while the EADCD054OA1 provides 12.5mcd. This 8.4x reduction affects visibility in high ambient light conditions. Applications in controlled indoor environments typically tolerate this difference. Applications requiring high visibility in bright sunlight or outdoor use may require alternative solutions.

Q: Does the color change from amber to orange affect functionality?

A: Color change does not affect electrical or functional operation. The 18nm wavelength shift remains within the visible spectrum. Visual appearance and user interface consistency may be affected if color standardization is required across product lines or user experience specifications.

Q: Are there pin-to-pin compatibility concerns?

A: Both parts use 18-DIP package configuration with common cathode architecture. Pin assignments for 14-segment alphanumeric displays follow industry standards. Direct pin-to-pin compatibility is maintained.

Q: What is the impact of the dimensional differences?

A: Height and width are transposed (0.988" x 0.835" becomes 0.835" x 0.988"), and depth is reduced by 0.032". PCB layout and mechanical enclosure clearances must be verified. If the original design incorporated tight mechanical constraints, dimensional verification is mandatory before implementation.

Q: Why is product status important for component selection?

A: The 104990121 is obsolete, indicating discontinued manufacturing. The EADCD054OA1 maintains active production status, ensuring availability for current and future procurement. Obsolete components present supply chain risk and potential cost escalation.

Q: Is the increased power dissipation a concern?

A: Power dissipation increases from 50mW to 60mW (20% increase). Thermal design evaluation is required if the original circuit operated near thermal limits. Most applications with adequate PCB thermal management accommodate this increase without modification.

Q: What compliance certifications apply to each part?

A: The EADCD054OA1 carries ROHS3 compliance certification. The 104990121 compliance status is not specified in available documentation. Current procurement standards typically require ROHS compliance, favoring the EADCD054OA1 for new designs and ongoing production.