LB-603MP 7-Segment LED Display - Equivalent & Substitute Parts

Part Overview

The LB-603MP is a 3-character, 0.56" green 7-segment LED display module manufactured by Rohm Semiconductor in a 28-DIP package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The display operates as a common cathode configuration with a forward voltage of 2.1V and 10mA test current, suitable for numeric and alphanumeric display applications in industrial and consumer electronics.

Substiute Parts

LB-603MP

Rohm SemiconductorIn Stock: 709LB-603MP Datasheet

Current PartRFQ

BC56-12GWA

KingbrightIn Stock: 1796BC56-12GWA Datasheet

SimilarRFQ

BC56-11CGKWA

KingbrightIn Stock: 1048BC56-11CGKWA Datasheet

SimilarRFQ

BC56-11GWA

KingbrightIn Stock: 961BC56-11GWA Datasheet

SimilarRFQ

LDT-C512RI

Lumex Opto/Components Inc.In Stock: 2146LDT-C512RI Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LB-603MP is determined by the following critical parameters:

• Display Configuration: 3-character, 7-segment, common cathode
• Character Size: 0.56" (14.22mm to 14.30mm tolerance)
• Package Type: 28-DIP (0.600", 15.24mm) pinout compatibility
• Color: Green wavelength (563nm to 574nm range)
• Electrical Compatibility: Forward voltage 2.1V to 2.2V; test current 10mA to 20mA

Substitute parts must maintain identical display configuration, package pinout, and common cathode topology. Variations in forward voltage (±0.1V), test current (up to 20mA), and brightness (millicandela rating) are acceptable within standard LED display operating ranges, provided the package footprint and pin assignment remain unchanged.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, consistent with the original LB-603MP specification. Selection among active alternatives should prioritize product availability and supply chain continuity.

BC56-11CGKWA (Kingbright) provides the highest brightness rating at 35mcd with 2.1V forward voltage matching the original specification, supporting direct replacement in brightness-critical applications.

BC56-11GWA (Kingbright) operates at 2.2V forward voltage with reduced brightness (8.6mcd), suitable for applications where lower luminous intensity is acceptable.

LDT-C512RI (Lumex Opto/Components Inc.) matches the original 10mA test current and 2.2V forward voltage with minimal brightness output (4.6mcd), appropriate for low-power or indicator-only applications.

All three substitute parts maintain identical 28-DIP package geometry and common cathode pinout configuration, enabling direct PCB footprint compatibility without layout modification.

Frequently Asked Questions (FAQ)

Q: Can BC56-12GWA substitute for LB-603MP? A: No. BC56-12GWA uses a 12-DIP package, which is incompatible with the 28-DIP footprint and pinout of LB-603MP. Package type is a non-negotiable substitution criterion.

Q: What is the impact of forward voltage variation between 2.1V and 2.2V? A: Forward voltage tolerance of ±0.1V is within standard LED display operating range. Circuit designs using current-limiting resistors will accommodate this variation without functional degradation. Verify resistor sizing for the specific forward voltage of the selected substitute.

Q: Are all substitute parts pin-compatible with LB-603MP? A: Yes. All listed substitutes use 28-DIP (0.600", 15.24mm) package configuration with common cathode topology, ensuring direct PCB compatibility without rewiring.

Q: How does brightness variation affect substitution suitability? A: Brightness (millicandela rating) depends on application requirements. BC56-11CGKWA (35mcd) provides higher visibility; LDT-C512RI (4.6mcd) suits indicator applications. Verify brightness requirements against circuit design specifications before selection.

Q: What is the wavelength difference between substitute parts? A: Wavelength variation ranges from 563nm to 574nm across all parts, representing standard green LED color tolerance. Visual color difference is negligible in typical applications. Verify wavelength specification if color matching is critical for multi-display assemblies.

Q: Are substitute parts available in the same packaging format as LB-603MP? A: BC56-11CGKWA and BC56-11GWA are supplied in standard packaging; LDT-C512RI is supplied in bulk. Verify packaging format requirements for production and inventory management.