LA-101VA 7-Segment LED Display: Equivalent & Substitute Parts

Part Overview

The LA-101VA is a 1-inch red 7-segment LED display module manufactured by Rohm Semiconductor, configured as a single character common anode display. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. The LA-101VA operates at 4V forward voltage with 10mA test current and delivers 10mcd brightness output at 650nm wavelength peak. Given its obsolescence status, identifying functionally equivalent substitute parts is necessary for ongoing maintenance, repair, and legacy system support where direct replacement is required.

Substiute Parts

LA-101VA

Rohm SemiconductorIn Stock: 787LA-101VA Datasheet

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LDS-AA14RI

Lumex Opto/Components Inc.In Stock: 999LDS-AA14RI Datasheet

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LDS-AA15RI

Lumex Opto/Components Inc.In Stock: 804LDS-AA15RI Datasheet

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LDS-AA16RI

Lumex Opto/Components Inc.In Stock: 1086LDS-AA16RI Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LA-101VA is determined by the following critical parameters:

Mandatory Matching Parameters:

• Display Type: 7-Segment
• Number of Characters: 1
• Common Pin Configuration: Common Anode
• Color: Red
• Digit/Alpha Size: 1.00" (25.40mm)
• Physical Dimensions: 1.339" H x 0.945" W x 0.413" D (34.00mm x 24.00mm x 10.50mm)
• Voltage - Forward (Vf) Typical: 4V (±0.6V tolerance acceptable)
• Current - Test: 10mA

Allowable Variation Parameters:

• Millicandela Rating: Brightness variations within the red LED spectrum
• Wavelength - Peak: Red spectrum range (630nm–700nm)
• Power Dissipation (Max): Variations due to different LED efficiency
• Package / Case: DIP configuration with compatible pin count and spacing
• Manufacturer: Different manufacturers producing equivalent specifications

The three substitute parts listed below meet all mandatory matching parameters and fall within allowable variation ranges for brightness and wavelength characteristics.

Parameter Comparison

Engineering Selection Recommendations

LDS-AA14RI (Lumex Opto/Components Inc.): This substitute maintains 4V forward voltage matching and delivers 9.8mcd brightness at 635nm wavelength, closely aligned with the LA-101VA specification. The 10-DIP package reduces pin count from 20 to 10, requiring circuit board layout modification. Product status is Active, ensuring continued availability. ROHS3 compliance is maintained.

LDS-AA15RI (Lumex Opto/Components Inc.): This substitute maintains 4V forward voltage and common anode configuration. The 1.5mcd brightness rating represents a significant reduction from the LA-101VA's 10mcd output, with wavelength peak at 700nm in the deep red spectrum. The 10-DIP package requires layout modification. Product status is Active with ROHS3 compliance.

LDS-AA16RI (Lumex Opto/Components Inc.): This substitute operates at 3.4V forward voltage, representing a 0.6V reduction from the LA-101VA specification. It delivers 20mcd brightness at 660nm wavelength, providing enhanced luminosity. The 10-DIP package requires layout modification. Product status is Active with ROHS3 compliance.

All three substitute parts maintain ROHS3 compliance and are currently in active production status, contrasting with the LA-101VA's end-of-life classification. Selection depends on circuit voltage supply capability and brightness requirements for the target application.

Frequently Asked Questions (FAQ)

Q: Can the LDS-AA14RI, LDS-AA15RI, or LDS-AA16RI be used as direct pin-for-pin replacements for the LA-101VA?

A: No. The LA-101VA uses a 20-DIP package, while all three Lumex substitutes use 10-DIP packages. Pin count and spacing differ, requiring circuit board layout modification and rewiring of segment connections.

Q: What is the significance of the different forward voltage ratings among the substitute parts?

A: The LA-101VA and LDS-AA14RI/LDS-AA15RI operate at 4V forward voltage. The LDS-AA16RI operates at 3.4V. Circuit designs must supply the appropriate voltage for the selected substitute. A 0.6V reduction in the LDS-AA16RI may reduce power dissipation but requires verification that the driving circuit can accommodate this lower voltage.

Q: How do the brightness ratings compare across these parts?

A: The LA-101VA delivers 10mcd at 650nm. The LDS-AA14RI provides 9.8mcd at 635nm (comparable brightness). The LDS-AA15RI provides only 1.5mcd at 700nm (significantly dimmer). The LDS-AA16RI provides 20mcd at 660nm (twice as bright). Application requirements determine which brightness level is appropriate.

Q: What does the wavelength difference mean for visual appearance?

A: All parts emit red light. The LA-101VA peaks at 650nm (standard red). The LDS-AA14RI peaks at 635nm (orange-red). The LDS-AA15RI peaks at 700nm (deep red). The LDS-AA16RI peaks at 660nm (pure red). Visual differences are subtle but may be noticeable in side-by-side comparison.

Q: Why do the substitute parts have significantly lower power dissipation ratings?

A: The LA-101VA is rated at 640mW maximum power dissipation, while the Lumex substitutes are rated at 100–105mW. This difference reflects improved LED efficiency in modern designs. Lower power dissipation reduces thermal management requirements.

Q: Are all parts RoHS compliant?

A: Yes. The LA-101VA and all three substitute parts are ROHS3 compliant, meeting environmental and hazardous substance restrictions.

Q: What is the current product availability status for each part?

A: The LA-101VA is classified as "Not For New Designs" (end-of-life). The LDS-AA14RI, LDS-AA15RI, and LDS-AA16RI are all classified as "Active," indicating current production and ongoing availability.