MST6140C Equivalent & Substitute Parts

Part Overview

The MST6140C is a 3-character red 7-segment LED display module manufactured by onsemi, featuring a 0.56" digit height in a 28-DIP package configuration. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The display operates at 2.1V forward voltage with a 20mA test current and delivers 0.7mcd brightness output at a 697nm peak wavelength.

Substiute Parts

MST6140C

onsemiIn Stock: 776MST6140C Datasheet

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LB-603VP

Rohm SemiconductorIn Stock: 1311LB-603VP Datasheet

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LDT-C514RI

Lumex Opto/Components Inc.In Stock: 1711LDT-C514RI Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MST6140C are qualified based on the following critical parameters:

• Display Configuration: 3-character, 7-segment, common cathode architecture
• Physical Package: 28-DIP (0.600", 15.24mm) form factor
• Digit Height: 0.56" (14.22mm ±0.08")
• Color: Red LED emission
• Electrical Compatibility: Forward voltage range 2.0V–2.1V; test current 10mA–20mA
• Environmental Classification: MSL 1 (Unlimited moisture sensitivity)

The identified substitutes LB-603VP and LDT-C514RI meet these core requirements while maintaining mechanical and electrical interchangeability within standard PCB assembly tolerances.

Parameter Comparison

Engineering Selection Recommendations

LB-603VP (Rohm Semiconductor): This substitute is actively manufactured and RoHS3 compliant. It operates at 2V forward voltage with 10mA test current, reducing power dissipation compared to the original MST6140C. The higher millicandela rating (16mcd) provides improved brightness output. Digit height tolerance (14.30mm) remains within acceptable mechanical interchangeability limits for standard 28-DIP PCB layouts.

LDT-C514RI (Lumex Opto/Components Inc.): This substitute is actively manufactured and RoHS3 compliant. It operates at 2V forward voltage with 10mA test current and maintains the original digit height specification (14.22mm). The millicandela rating (5.6mcd) and wavelength (635nm) provide moderate brightness output suitable for standard display applications.

Both substitutes maintain full electrical and mechanical compatibility with the MST6140C within the 28-DIP package standard and common cathode configuration.

Frequently Asked Questions (FAQ)

Q: Can LB-603VP or LDT-C514RI be used as direct pin-for-pin replacements for MST6140C?

A: Yes. Both substitutes use the 28-DIP (0.600", 15.24mm) package with common cathode configuration, enabling direct PCB substitution without layout modifications.

Q: What is the impact of the lower test current (10mA) in the substitute parts compared to the original 20mA specification?

A: The substitute parts operate at half the test current, resulting in lower power dissipation and reduced thermal load on the display module. Circuit designs must account for this difference in current-limiting resistor calculations to maintain appropriate segment brightness.

Q: Are there mechanical compatibility concerns with the digit height variations (14.22mm vs. 14.30mm)?

A: The 0.08mm variation between MST6140C (14.22mm) and LB-603VP (14.30mm) is within standard PCB assembly tolerances and does not affect mechanical interchangeability in typical 28-DIP socket applications.

Q: What compliance certifications apply to the substitute parts?

A: Both LB-603VP and LDT-C514RI are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and distribution.

Q: How do the wavelength differences (697nm, 650nm, 635nm) affect visual appearance?

A: The wavelength variations represent different red spectrum emissions. MST6140C operates at 697nm (deep red), LB-603VP at 650nm (standard red), and LDT-C514RI at 635nm (orange-red). Visual perception differences are minimal in typical display applications but may be noticeable in side-by-side comparison.