LB-603MF Equivalent & Substitute Parts

Part Overview

The LB-603MF is a 3-character, 0.56" green 7-segment LED display module manufactured by Rohm Semiconductor in a 28-DIP package configuration. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. The display operates at 2.1V forward voltage with a 10mA test current and delivers 25mcd brightness at a 563nm peak wavelength. Given its discontinued design status, identifying functionally equivalent substitute components is essential for legacy system maintenance, repair, and component sourcing.

Substiute Parts

LB-603MF

Rohm SemiconductorIn Stock: 957LB-603MF Datasheet

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BA56-11CGKWA

KingbrightIn Stock: 1037BA56-11CGKWA Datasheet

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BA56-11GWA

KingbrightIn Stock: 1240BA56-11GWA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute components for the LB-603MF must satisfy the following criteria to ensure functional compatibility:

Primary Compatibility Requirements:

• 3-character display configuration
• 7-segment display type
• Common anode pin configuration
• Green LED color
• 0.56" digit size (14.22mm to 14.30mm range)
• 28-DIP package footprint (0.600", 15.24mm pitch)

Electrical Parameter Tolerance:

• Forward voltage (Vf): 2.1V to 2.2V range acceptable
• Test current: 10mA to 20mA operational range
• Package and pinout compatibility with 28-DIP standard

The substitute parts identified (BA56-11CGKWA and BA56-11GWA from Kingbright) maintain identical mechanical footprint, pinout, and primary functional characteristics while operating within acceptable electrical parameter variations. Both substitutes are classified as "Active" products, ensuring ongoing availability and supply chain reliability.

Parameter Comparison

Engineering Selection Recommendations

BA56-11CGKWA Selection Criteria: This Kingbright substitute maintains 2.1V forward voltage matching the original LB-603MF specification. The 20mA test current represents a 2x increase over the original design, requiring circuit current-limiting adjustments. The 35mcd brightness rating provides enhanced luminosity compared to the original 25mcd. The 574nm wavelength exhibits a slight green shift relative to the original 563nm specification. This part is actively manufactured and ROHS3 compliant, supporting long-term supply chain continuity.

BA56-11GWA Selection Criteria: This Kingbright substitute operates at 2.2V forward voltage, representing a 0.1V increase from the original specification. The 20mA test current requires identical circuit modifications as the BA56-11CGKWA. The 8.6mcd brightness rating is significantly lower than the original 25mcd, suitable only for applications where reduced luminosity is acceptable. The 565nm wavelength closely matches the original 563nm specification. This part is actively manufactured, ROHS3 compliant, and available in tube packaging.

Both substitutes are mechanically and electrically compatible with the LB-603MF footprint and pinout. Selection between them depends on brightness requirements and forward voltage tolerance in the target application circuit.

Frequently Asked Questions (FAQ)

Q: Can BA56-11CGKWA and BA56-11GWA be used interchangeably with LB-603MF?

A: Both Kingbright parts are mechanically and electrically compatible with the LB-603MF in terms of package footprint, pinout, and primary display function. However, differences in forward voltage (2.1V vs. 2.2V), test current (10mA vs. 20mA), and brightness ratings require circuit evaluation before substitution.

Q: What are the key differences between BA56-11CGKWA and BA56-11GWA?

A: Both parts share identical mechanical specifications and 28-DIP packaging. The primary differences are forward voltage (2.1V vs. 2.2V), brightness rating (35mcd vs. 8.6mcd), and wavelength (574nm vs. 565nm). BA56-11CGKWA provides higher brightness, while BA56-11GWA offers wavelength closer to the original LB-603MF.

Q: Does the 20mA test current in substitute parts affect circuit design?

A: Yes. The original LB-603MF operates at 10mA test current, while both Kingbright substitutes operate at 20mA. Existing current-limiting resistor values must be recalculated to accommodate the higher current draw and maintain proper brightness levels.

Q: Are all three parts ROHS3 compliant?

A: Yes. The LB-603MF, BA56-11CGKWA, and BA56-11GWA are all ROHS3 compliant, meeting environmental and hazardous substance restrictions for electronic components.

Q: What is the significance of the wavelength differences (563nm, 574nm, 565nm)?

A: Wavelength differences affect the perceived color shade of the green display. The original LB-603MF operates at 563nm (pure green), BA56-11CGKWA at 574nm (yellow-green shift), and BA56-11GWA at 565nm (closest to original). Visual appearance may differ slightly between parts in the same application.

Q: Can I use BA56-11GWA if brightness is not critical?

A: Yes. The BA56-11GWA is suitable for applications where the 8.6mcd brightness rating is acceptable. The 28-DIP footprint and common anode configuration ensure mechanical and electrical compatibility with the original LB-603MF circuit.