LDS-A402RI Equivalent & Substitute Parts

Part Overview

The LDS-A402RI is a single-character 7-segment LED display module manufactured by Lumex Opto/Components Inc. This green display operates as a common anode configuration with a 0.40-inch character height, designed for numeric and alphanumeric applications. The component is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent functional performance can be achieved within the specified electrical and mechanical parameters of the 7-segment display category. The LTS-4510AG from Lite-On Inc. meets the core substitution criteria for this application.

Substiute Parts

LDS-A402RI

Lumex Opto/Components Inc.In Stock: 1162LDS-A402RI Datasheet

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LTS-4510AG

Lite-On Inc.In Stock: 2426LTS-4510AG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The LTS-4510AG qualifies as a direct substitute for the LDS-A402RI based on the following alignment of critical parameters:

Matching Parameters:

• Display Type: Both are 7-segment LED displays
• Character Count: Both are single-character modules
• Character Height: Both are 0.40-inch (10.16mm)
• Common Pin Configuration: Both use common anode architecture
• Color: Both emit green light at 565nm peak wavelength
• Package Type: Both use 14-DIP (0.300", 7.62mm) footprint
• Regulatory Compliance: Both are RoHS3 compliant
• MSL Rating: Both have MSL 1 (Unlimited)

Allowable Parameter Variations:

• Forward Voltage (Vf): LDS-A402RI operates at 2.2V typical; LTS-4510AG operates at 2.1V typical. This 0.1V difference is within acceptable tolerance for common anode 7-segment displays in this category.
• Test Current: LDS-A402RI specifies 10mA; LTS-4510AG specifies 20mA. The substitute accepts higher current while maintaining functional compatibility through circuit design adjustment.
• Millicandela Rating: LDS-A402RI provides 2.8mcd; LTS-4510AG provides 2.2mcd. Both ratings fall within standard brightness specifications for this display class.
• Power Dissipation: LDS-A402RI maximum is 105mW; LTS-4510AG maximum is 75mW. The substitute operates at lower power dissipation.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (LDS-A402RI): The LDS-A402RI remains the primary choice when the original specification is available and procurement lead times are acceptable. This part is actively manufactured by Lumex Opto/Components Inc. with full RoHS3 compliance and REACH unaffected status.

Substitute Selection (LTS-4510AG): The LTS-4510AG from Lite-On Inc. is qualified as a direct substitute when the following conditions apply:

1. Availability Constraint: The LDS-A402RI is unavailable or subject to extended lead times.
2. Circuit Design Accommodation: The application circuit can accommodate the 2.1V forward voltage specification (0.1V lower than the primary part) and the 20mA test current specification (2x the primary part).
3. Brightness Tolerance: The application accepts the 2.2mcd brightness rating of the substitute, which is approximately 21% lower than the primary part's 2.8mcd rating.
4. Regulatory Alignment: Both parts meet RoHS3 compliance requirements. The LTS-4510AG carries REACH Affected status, which must be evaluated against project-specific regulatory requirements.

Mechanical Compatibility: Both parts use identical 14-DIP (0.300", 7.62mm) footprints with negligible physical dimension variations (less than 0.1mm in height and depth). Direct PCB footprint substitution is supported without layout modification.

Electrical Compatibility: Circuit designs must accommodate the parameter variations listed in the comparison table. The lower forward voltage and higher test current of the LTS-4510AG require verification of current-limiting resistor values and power supply specifications to ensure proper operation within the application's design envelope.

Frequently Asked Questions (FAQ)

Q: Can the LTS-4510AG be used as a direct drop-in replacement for the LDS-A402RI without circuit modification?

A: The LTS-4510AG shares identical package footprint and pinout with the LDS-A402RI, enabling physical installation without PCB layout changes. However, electrical circuit parameters must be verified. The substitute operates at 2.1V forward voltage (versus 2.2V) and 20mA test current (versus 10mA). Current-limiting resistor values in the display driver circuit may require adjustment to accommodate these specifications. Verification is necessary before production implementation.

Q: What is the brightness difference between these two parts?

A: The LDS-A402RI provides 2.8mcd (millicandela) brightness, while the LTS-4510AG provides 2.2mcd. This represents approximately 21% lower brightness in the substitute part. Applications requiring specific brightness levels must evaluate whether this reduction is acceptable for the intended use case.

Q: Are both parts compliant with environmental regulations?

A: Both the LDS-A402RI and LTS-4510AG are RoHS3 compliant. The LDS-A402RI carries REACH Unaffected status, while the LTS-4510AG carries REACH Affected status. Projects subject to REACH compliance requirements must confirm that the substitute part's REACH Affected designation is acceptable within the application's regulatory framework.

Q: What is the difference in power consumption between these parts?

A: The LDS-A402RI has a maximum power dissipation of 105mW, while the LTS-4510AG has a maximum power dissipation of 75mW. The substitute operates at lower power dissipation, which may provide thermal benefits in applications with multiple display modules or space-constrained designs.

Q: Are the physical dimensions identical?

A: The physical dimensions are nearly identical with negligible variations. The LDS-A402RI measures 0.736" H x 0.386" W x 0.201" D (18.70mm x 9.80mm x 5.10mm), while the LTS-4510AG measures 0.738" H x 0.386" W x 0.200" D (18.75mm x 9.80mm x 5.08mm). These differences are less than 0.1mm and do not affect mechanical compatibility or mounting.

Q: Can I use the LTS-4510AG if my circuit is designed for the LDS-A402RI's 10mA specification?

A: The LTS-4510AG is rated for 20mA test current, which is twice the LDS-A402RI specification. If your circuit is designed with current-limiting resistors calculated for 10mA operation, the substitute will draw approximately double the current. This may result in excessive brightness or reduced component lifespan. Circuit resistor values must be recalculated or verified to ensure proper operation at the substitute's electrical specifications.

Q: What is the wavelength specification for both parts?

A: Both the LDS-A402RI and LTS-4510AG operate at 565nm peak wavelength, which corresponds to green light emission. This identical wavelength specification ensures color consistency between the primary and substitute parts.

Q: Are both parts available in the same packaging format?

A: Yes, both parts use 14-DIP (0.300", 7.62mm) packaging. The LDS-A402RI is specified with 10 leads, while the LTS-4510AG specification does not explicitly detail lead count, but the identical package type confirms footprint compatibility. Both parts are suitable for through-hole PCB assembly.