MST6941C Equivalent & Substitute Parts

Part Overview

The MST6941C is a 3-character red 7-segment LED display module manufactured by onsemi, featuring a 0.56" digit size in a 12-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 2V forward voltage with 20mA test current and delivers 2.2mcd brightness at a 635nm wavelength peak.

Substiute Parts

MST6941C

onsemiIn Stock: 731MST6941C Datasheet

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LDT-C514RI

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

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LTC-571HR

Lite-On Inc.In Stock: 1118LTC-571HR Datasheet

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LTC-571P

Lite-On Inc.In Stock: 950LTC-571P Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MST6941C is determined by the following critical parameters:

• Display Configuration: 3-character, 7-segment, common cathode architecture
• Digit Size: 0.56" (14.22mm) character height
• Color & Wavelength: Red LED at 635nm peak wavelength
• Electrical Specifications: 2V forward voltage and 20mA test current compatibility
• Package Type: 12-DIP or functionally equivalent package with compatible pinout

The substitute parts listed below meet these core substitution criteria. Variations in millicandela rating, power dissipation, and package pitch are noted where they occur, as these parameters may affect circuit design considerations but do not prevent functional substitution.

Parameter Comparison

Engineering Selection Recommendations

LTC-571HR (Lite-On Inc.) provides the closest electrical and mechanical match to the MST6941C. This part maintains identical 12-DIP packaging, 2V forward voltage, 20mA test current, and 635nm wavelength specifications. The LTC-571HR is actively manufactured and carries ROHS3 compliance certification, making it the primary substitute for direct replacement applications.

LTC-571P (Lite-On Inc.) operates at 2.1V forward voltage with reduced millicandela output (0.95mcd) and exhibits a longer wavelength peak at 697nm. This part is suitable for applications where lower brightness is acceptable and forward voltage tolerance permits the 0.1V increase. ROHS3 compliance is maintained.

LDT-C514RI (Lumex Opto/Components Inc.) delivers higher brightness (5.6mcd) but requires a 28-DIP package configuration and operates at reduced test current (10mA). This substitute is applicable only when PCB layout accommodates the 28-DIP footprint and when increased brightness is beneficial. ROHS3 compliance status is not specified in available data.

All three substitute parts maintain common cathode configuration, 3-character display architecture, and 0.56" digit size compatibility with the original MST6941C specification.

Frequently Asked Questions (FAQ)

Q: Can LTC-571P replace MST6941C in existing designs without circuit modification?

A: LTC-571P operates at 2.1V forward voltage compared to MST6941C's 2V specification. Circuit designs with tight voltage tolerance requirements may require resistor value adjustment. The reduced brightness (0.95mcd vs. 2.2mcd) and extended wavelength (697nm vs. 635nm) may affect visual appearance in the application.

Q: What is the primary advantage of LDT-C514RI as a substitute?

A: LDT-C514RI delivers 5.6mcd brightness, significantly higher than the MST6941C's 2.2mcd output. However, this part requires a 28-DIP package footprint and operates at 10mA test current. Selection depends on PCB layout compatibility and brightness requirements.

Q: Are all substitute parts pin-compatible with MST6941C?

A: LTC-571HR and LTC-571P maintain 12-DIP package compatibility with MST6941C. LDT-C514RI uses a 28-DIP package and requires PCB redesign for pinout accommodation. Verify specific pinout documentation before implementation.

Q: Which substitute offers the best compliance certification status?

A: LTC-571HR and LTC-571P both carry ROHS3 compliance certification and are actively manufactured. These parts are recommended for applications requiring current compliance documentation and ongoing supply chain availability.

Q: How does test current affect substitute selection?

A: MST6941C, LTC-571HR, and LTC-571P all operate at 20mA test current. LDT-C514RI operates at 10mA, requiring circuit current-limiting resistor adjustment. Lower test current reduces power dissipation but may affect brightness output consistency.