MAN8940 7-Segment LED Display - Equivalent & Substitute Parts

Part Overview

The MAN8940 is a 0.8-inch single-character 7-segment LED display manufactured by onsemi, featuring a common cathode configuration with red color output. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The display operates at a maximum forward voltage of 2.5V with a test current of 20mA, housed in an 18-DIP package with 14 leads.

Substiute Parts

MAN8940

onsemiIn Stock: 788MAN8940 Datasheet

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LTS-3403LE

Lite-On Inc.In Stock: 1052LTS-3403LE Datasheet

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SC08-21EWA

KingbrightIn Stock: 3207SC08-21EWA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MAN8940 are qualified based on the following electrical and mechanical parameters:

• Display type: 7-Segment configuration
• Character count: Single character
• Digit size: 0.80" (20.32mm)
• Common pin type: Common Cathode
• Package: 18-DIP (0.600", 15.24mm)
• Test current: 20mA
• Forward voltage compatibility: Operating range within or below 2.5V maximum

The substitute parts SC08-21EWA and LTS-3403LE meet these core substitution criteria. Both maintain identical display type, character count, digit size, common cathode configuration, and package footprint. Variations in forward voltage (2.0V vs. 2.5V), color specification (red vs. orange-red), and millicandela rating are within acceptable tolerance ranges for 7-segment display applications and do not prevent functional substitution.

Parameter Comparison

Engineering Selection Recommendations

SC08-21EWA (Kingbright) is the primary substitute for MAN8940 applications. This part maintains identical electrical and mechanical specifications with active product status and RoHS3 compliance certification. The SC08-21EWA operates at 2V forward voltage, reducing thermal stress compared to the MAN8940's 2.5V maximum rating. The higher millicandela rating (8mcd vs. 2.2mcd) provides improved brightness characteristics. Pin count difference (15 leads vs. 14 leads) requires verification against specific PCB layout requirements.

LTS-3403LE (Lite-On Inc.) serves as a secondary substitute option. This part meets all core substitution criteria with active product status and RoHS3 compliance. The orange-red color specification (630nm peak wavelength) differs from the MAN8940's red specification (635nm), which may affect visual appearance in applications where color consistency is critical. The LTS-3403LE operates at 2V forward voltage with comparable millicandela rating (2.4mcd vs. 2.2mcd). Pin count is 13 leads, requiring layout verification.

Both substitute parts feature significantly lower power dissipation (75mW vs. 600mW), indicating improved thermal efficiency and reduced design margin requirements.

Frequently Asked Questions (FAQ)

Q: Can SC08-21EWA and LTS-3403LE be used interchangeably with MAN8940?

A: Both parts meet the core substitution criteria for 7-segment display applications: identical display type, character count, digit size, common cathode configuration, and 18-DIP package footprint. However, differences in pin count (13, 14, or 15 leads) and color specification require PCB layout verification and visual assessment for your specific application.

Q: What is the impact of the 2V forward voltage in substitute parts versus the MAN8940's 2.5V maximum?

A: The lower forward voltage in SC08-21EWA and LTS-3403LE reduces power dissipation and thermal stress on the display. Circuit designs must accommodate this voltage difference through appropriate current-limiting resistor selection. The 2V operating point is within standard LED display design practice.

Q: Does the color difference between red (MAN8940) and orange-red (LTS-3403LE) affect substitution?

A: Color specification differences are determined by peak wavelength: MAN8940 at 635nm (red) and LTS-3403LE at 630nm (orange-red). Visual appearance will differ. SC08-21EWA maintains red color specification (627nm) closer to the original. Select based on application requirements for color consistency.

Q: How do pin count differences affect PCB compatibility?

A: MAN8940 uses 14 leads, SC08-21EWA uses 15 leads, and LTS-3403LE uses 13 leads within the same 18-DIP package footprint. Verify PCB layout and schematic connections to ensure all required segment and common pins align with your design. Pin assignment documentation for each part is required.

Q: What compliance certifications apply to substitute parts?

A: SC08-21EWA and LTS-3403LE both carry RoHS3 compliance certification and MSL Level 1 (Unlimited) moisture sensitivity rating. Both parts are REACH Unaffected and classified as EAR99 for export control purposes.