LB-303VK 7-Segment LED Display - Equivalent & Substitute Parts

Part Overview

The LB-303VK is a 3-character red 7-segment LED display module manufactured by Rohm Semiconductor, designed for numeric and alphanumeric display applications. This component features a common cathode configuration with 0.31" character height and operates at 2V forward voltage with 10mA test current. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations where this display type is required.

Substiute Parts

LB-303VK

Rohm SemiconductorIn Stock: 792LB-303VK Datasheet

Current PartRFQ

ELT-315SDRWA/S530-A3

Everlight Electronics Co LtdIn Stock: 825ELT-315SDRWA/S530-A3 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LB-303VK is determined by the following critical parameters:

• Display Configuration: 3-character, 7-segment, common cathode architecture
• Electrical Compatibility: 2V forward voltage and red wavelength (650nm) for direct circuit integration
• Package Type: 12-DIP form factor for PCB mounting compatibility
• Optical Characteristics: Red color and peak wavelength matching for consistent visual output

The ELT-315SDRWA/S530-A3 qualifies as a substitute based on matching these core parameters. Variations in character height (0.31" vs 0.36"), test current (10mA vs 20mA), and physical dimensions represent acceptable engineering trade-offs within the same functional category, provided circuit design accommodates the higher current specification.

Parameter Comparison

Engineering Selection Recommendations

The ELT-315SDRWA/S530-A3 is the qualified substitute for the obsolete LB-303VK based on functional equivalence in display architecture, electrical characteristics, and regulatory compliance. Both components are ROHS3 compliant and operate at identical forward voltage (2V) with matching red wavelength (650nm).

Selection of the substitute requires circuit design verification for the following considerations:

• Current Specification: The substitute operates at 20mA test current versus the original 10mA. Circuit current-limiting resistors must be recalculated to accommodate this specification.
• Physical Dimensions: The substitute exhibits larger character height (0.36" vs 0.31") and increased overall package dimensions. PCB layout and mechanical clearance must be confirmed.
• Brightness: The substitute provides higher luminous intensity (6.4mcd vs 4mcd), which may require adjustment of current-limiting resistor values to maintain consistent display brightness in the application.
• Product Availability: The substitute is currently in active production status, ensuring long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the ELT-315SDRWA/S530-A3 be used as a direct pin-for-pin replacement for the LB-303VK?

A: Both components use 12-DIP packaging with common cathode configuration. Pin compatibility exists for the core display function. However, the substitute has 11 leads versus the original specification, requiring verification of lead count and pinout alignment with the PCB design.

Q: What is the impact of the 10mA to 20mA current difference?

A: The substitute requires twice the test current. This affects circuit design through current-limiting resistor selection. Resistor values must be recalculated using Ohm's law based on the 20mA specification to prevent over-current conditions and ensure proper display operation.

Q: Are there mechanical compatibility issues due to size differences?

A: The substitute is physically larger (0.36" character height vs 0.31", and 14.10mm x 22.60mm x 7.20mm vs 13.00mm x 22.00mm x 5.00mm). PCB layout, bezel openings, and mechanical mounting must accommodate these increased dimensions.

Q: Do both components meet the same regulatory standards?

A: Yes. Both the LB-303VK and ELT-315SDRWA/S530-A3 are ROHS3 compliant and carry EAR99 ECCN classification, meeting equivalent regulatory requirements for industrial and commercial applications.

Q: What is the significance of the higher millicandela rating on the substitute?

A: The substitute provides 6.4mcd versus 4mcd on the original. This increased brightness may require adjustment of current-limiting resistor values to maintain consistent visual output matching the original design intent.