MSD4140C Equivalent & Substitute Parts

Part Overview

The MSD4140C is a 7-segment LED display module manufactured by onsemi, featuring a dual-character red display in a 16-DIP package. 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 provides 0.8mcd brightness output. Identifying compatible alternatives ensures design continuity and supply chain reliability.

Substiute Parts

MSD4140C

onsemiIn Stock: 945MSD4140C Datasheet

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LDD-C404NI

Lumex Opto/Components Inc.In Stock: 4700LDD-C404NI Datasheet

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LTD-432PC

Lite-On Inc.In Stock: 743LTD-432PC Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MSD4140C are qualified based on the following critical parameters:

• Display Format: 2-character, 7-segment configuration
• Common Pin Type: Common cathode architecture
• Color: Red LED emission
• Digit Size: 0.40" (10.16mm) character height
• Package: 16-DIP (0.500", 12.70mm) footprint
• Electrical Compatibility: Forward voltage and test current within acceptable operating ranges for the application
• Physical Dimensions: Overall height, width, and depth compatibility with PCB layout constraints

The identified substitutes (LDD-C404NI and LTD-432PC) meet these core requirements, enabling direct functional replacement in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

LDD-C404NI (Lumex Opto/Components Inc.): This substitute is classified as active product status with ROHS3 compliance. The forward voltage is 2V (0.1V lower than the original), and test current is 10mA (50% reduction). The wavelength peak shifts to 635nm with significantly higher brightness output (3.9mcd). Power dissipation increases to 105mW. This part is suitable for applications where lower current draw is advantageous and higher brightness is acceptable or beneficial.

LTD-432PC (Lite-On Inc.): This substitute maintains active product status with ROHS3 compliance. Electrical parameters match the original precisely (2.1V forward voltage, 20mA test current, 697nm wavelength). Physical dimensions show minor variations (0.634" H vs. 0.630" H, 0.866" W vs. 0.795" W, 0.319" D vs. 0.276" D). Power dissipation and brightness characteristics are comparable to the original. This part provides the closest electrical and mechanical alignment with the MSD4140C.

Frequently Asked Questions (FAQ)

Q: Can LDD-C404NI be used as a direct replacement for MSD4140C?

A: LDD-C404NI is functionally compatible as a 2-character, 7-segment, common cathode red display in a 16-DIP package. However, the reduced test current (10mA vs. 20mA) and different wavelength peak (635nm vs. 697nm) require circuit verification. The higher brightness output (3.9mcd vs. 0.8mcd) may necessitate current-limiting resistor adjustments.

Q: What are the physical compatibility considerations?

A: Both substitutes use the standard 16-DIP (0.500", 12.70mm) package footprint, ensuring PCB socket compatibility. LTD-432PC shows minor dimensional variations in overall height, width, and depth but remains within typical mechanical tolerance ranges for display module mounting. LDD-C404NI dimensions are nearly identical to the original.

Q: How do wavelength differences affect application performance?

A: MSD4140C and LTD-432PC both emit at 697nm (red). LDD-C404NI emits at 635nm (orange-red). In applications where color consistency is critical across multiple units or batches, wavelength matching should be verified against design specifications.

Q: Are there compliance or supply chain advantages to either substitute?

A: Both LDD-C404NI and LTD-432PC are active products with ROHS3 compliance and unlimited moisture sensitivity rating. LDD-C404NI reports higher inventory availability (4601 pcs), while LTD-432PC offers 703 pcs. The original MSD4140C is obsolete, making substitution necessary for new production.

Q: Which substitute is recommended for new designs?

A: Selection depends on application requirements. LTD-432PC provides the closest electrical and optical match to the original MSD4140C. LDD-C404NI is suitable when lower current consumption and higher brightness are design advantages, provided circuit modifications are acceptable.