MAN74A 7-Segment LED Display - Equivalent & Substitute Parts

Part Overview

The MAN74A is a single-character, 0.30-inch red 7-segment LED display manufactured by onsemi in a 14-DIP package configuration. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The MAN74A operates as a common cathode display with a forward voltage of 2.2V and test current of 20mA, designed for numeric and alphanumeric display applications in legacy and retrofit applications.

Substiute Parts

MAN74A

onsemiIn Stock: 1166MAN74A Datasheet

Current PartRFQ

LTS-313AP

Lite-On Inc.In Stock: 1072LTS-313AP Datasheet

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SC03-12HDB

KingbrightIn Stock: 1045SC03-12HDB Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MAN74A are evaluated based on the following critical parameters that determine functional and mechanical compatibility:

Primary Compatibility Criteria:

• Display Type: 7-Segment LED (single character)
• Digit Size: 0.30" (7.62mm)
• Color: Red
• Common Pin Configuration: Common Cathode
• Test Current: 20mA
• Forward Voltage Range: 2.1V to 2.5V (acceptable tolerance for common cathode red LEDs)
• Package Type: DIP configuration with standard 0.300" (7.62mm) pitch

Substitution Logic: Parts are grouped as direct substitutes when they maintain the same display type, character count, digit size, color, and common cathode configuration. Forward voltage variations within 0.4V and package pitch compatibility are acceptable for common cathode 7-segment displays operating at 20mA test current. Package lead count differences (10-DIP vs. 14-DIP) are noted as they affect PCB layout but do not prevent functional substitution when pin assignments are verified.

Parameter Comparison

Engineering Selection Recommendations

LTS-313AP (Lite-On Inc.): This substitute is actively manufactured and ROHS3 compliant. The 10-DIP package differs from the MAN74A's 14-DIP configuration, requiring PCB layout modification. Forward voltage of 2.1V is within acceptable tolerance for common cathode red 7-segment displays. Peak wavelength of 697nm represents a minor shift from the MAN74A's 660nm. Power dissipation of 40mW is significantly lower than the MAN74A's 480mW maximum rating. This part is suitable for applications where PCB redesign is feasible and lower power dissipation is beneficial.

SC03-12HDB (Kingbright): This substitute maintains the 14-DIP package configuration, minimizing PCB layout changes. The part is actively manufactured and ROHS3 compliant. Forward voltage of 2.5V is within acceptable tolerance for common cathode red 7-segment displays. Physical dimensions show minor variations (0.750" H vs. 0.738" H, 0.400" W vs. 0.386" W, 0.240" D vs. 0.200" D). Peak wavelength of 700nm is comparable to the MAN74A. Power dissipation of 120mW is lower than the MAN74A's maximum rating. This part is suitable for direct PCB substitution with minimal layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the LTS-313AP be used as a direct replacement for the MAN74A without PCB modifications?

A: No. The LTS-313AP uses a 10-DIP package while the MAN74A uses a 14-DIP package. PCB layout modifications are required to accommodate the different pin configuration and lead count.

Q: Can the SC03-12HDB be used as a direct replacement for the MAN74A?

A: The SC03-12HDB uses the same 14-DIP package configuration as the MAN74A, making it suitable for direct PCB substitution. However, minor physical dimension variations should be verified against mechanical constraints in the application.

Q: What is the significance of the forward voltage differences between these parts?

A: The MAN74A operates at 2.2V, the LTS-313AP at 2.1V, and the SC03-12HDB at 2.5V. These variations are within acceptable tolerance for common cathode red 7-segment LED displays. Current-limiting resistor values may require minor adjustment based on the specific application circuit design.

Q: Why is the power dissipation of the LTS-313AP and SC03-12HDB significantly lower than the MAN74A?

A: The MAN74A's 480mW maximum power dissipation rating reflects its design specifications. The lower ratings for substitute parts indicate different internal LED segment configurations or efficiency characteristics. Both substitute parts operate at the same 20mA test current, making them functionally compatible.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the LTS-313AP and SC03-12HDB are ROHS3 compliant. The MAN74A's RoHS status is not specified in the provided data.

Q: What is the wavelength difference between these parts?

A: The MAN74A has a peak wavelength of 660nm, the LTS-313AP 697nm, and the SC03-12HDB 700nm. These variations represent different red LED formulations. The visual color difference may be perceptible in side-by-side comparison but both substitute parts maintain red color classification.

Q: Can these parts be used interchangeably in existing designs?

A: Functional interchangeability depends on package compatibility. The SC03-12HDB (14-DIP) can replace the MAN74A with minimal modifications. The LTS-313AP (10-DIP) requires PCB redesign. In both cases, circuit verification is necessary to confirm pin assignment compatibility and current-limiting resistor appropriateness.