LA-101MK 7-Segment LED Display - Equivalent & Substitute Parts

Part Overview

The LA-101MK is a 1-inch green 7-segment LED display module manufactured by Rohm Semiconductor, configured as a single character common cathode display in a 20-DIP package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing production and maintenance applications. The display operates at 4.2V forward voltage with 10mA test current and delivers 16mcd brightness at a peak wavelength of 563nm.

Substiute Parts

LA-101MK

Rohm SemiconductorIn Stock: 778LA-101MK Datasheet

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LDS-CA12RI

Lumex Opto/Components Inc.In Stock: 1058LDS-CA12RI Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LA-101MK is determined by the following critical parameters:

Display configuration: 7-segment, single character, common cathode topology Physical form factor: 1-inch character size with matching overall dimensions (34.00mm x 24.00mm x 10.50mm) Electrical compatibility: Forward voltage within acceptable operating range, 10mA test current specification Color and wavelength: Green LED emission Package compatibility: DIP-based pinout suitable for through-hole PCB mounting Compliance requirements: ROHS3 compliance and REACH unaffected status

The LDS-CA12RI from Lumex Opto/Components Inc. qualifies as a substitute based on matching display type, character configuration, common cathode pin arrangement, color, physical dimensions, electrical current specification, and compliance certifications. Variations in package pin count (10-DIP vs. 20-DIP), forward voltage (4.4V vs. 4.2V), brightness rating (6.3mcd vs. 16mcd), and wavelength (565nm vs. 563nm) represent engineering trade-offs that must be evaluated within specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The LDS-CA12RI represents an active product alternative to the obsolete LA-101MK, with both components meeting ROHS3 compliance and REACH unaffected status requirements. The substitute part maintains functional equivalence in display topology, character configuration, common cathode architecture, color specification, and physical form factor.

The primary engineering considerations for substitution are:

Package pin count difference: The LDS-CA12RI uses a 10-DIP package versus the LA-101MK's 20-DIP configuration. PCB layout and connector compatibility must be evaluated for the specific application.

Forward voltage specification: The LDS-CA12RI operates at 4.4V compared to the LA-101MK's 4.2V. Circuit design must accommodate this 0.2V increase in the current-limiting resistor calculation.

Brightness rating: The LDS-CA12RI delivers 6.3mcd versus the LA-101MK's 16mcd. Applications requiring the original brightness level may require circuit modifications or alternative substitutes.

Power dissipation: The LDS-CA12RI dissipates 105mW maximum versus the LA-101MK's 640mW, resulting in reduced thermal load on the PCB and supporting circuitry.

Wavelength shift: The LDS-CA12RI peak wavelength is 565nm versus 563nm for the LA-101MK, representing a negligible visual difference in green LED emission.

Frequently Asked Questions (FAQ)

Q: Can the LDS-CA12RI directly replace the LA-101MK without PCB modifications?

A: Direct replacement depends on PCB design. The 10-DIP package of the LDS-CA12RI differs from the LA-101MK's 20-DIP package, requiring pin mapping verification. Physical dimensions are identical, but pinout configuration must be confirmed against the original circuit schematic.

Q: What impact does the 0.2V forward voltage difference have on circuit operation?

A: The 4.4V forward voltage of the LDS-CA12RI versus the LA-101MK's 4.2V requires recalculation of current-limiting resistor values to maintain 10mA test current. The resistor adjustment is typically minor but must be performed to ensure proper LED operation and prevent overcurrent conditions.

Q: Is the reduced brightness of the LDS-CA12RI (6.3mcd vs. 16mcd) acceptable for all applications?

A: Brightness acceptability depends on the specific application requirements. Applications with ambient light conditions or viewing distance constraints may require the higher brightness of the original part. Alternative substitutes with higher brightness ratings should be evaluated if the reduced brightness is insufficient.

Q: Are both parts suitable for new production designs?

A: The LA-101MK is obsolete and unsuitable for new production. The LDS-CA12RI is active and appropriate for new designs, provided the engineering considerations regarding package, voltage, and brightness are addressed in the circuit design.

Q: Do both parts meet current regulatory compliance requirements?

A: Both the LA-101MK and LDS-CA12RI are ROHS3 compliant and REACH unaffected, meeting current regulatory standards for electronic component manufacturing and use.