LTS-3403LR 7-Segment LED Display - Equivalent & Substitute Parts

Part Overview

The LTS-3403LR is a single-character, 0.8-inch red 7-segment LED display manufactured by Lite-On Inc. in a 18-DIP package configuration with 13 leads. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The display operates as a common cathode device with a forward voltage of 1.7V and test current of 20mA, suitable for numeric and alphanumeric display applications in industrial and consumer electronics.

Substiute Parts

LTS-3403LR

Lite-On Inc.In Stock: 918LTS-3403LR Datasheet

Current PartRFQ

HDSP-816E

Broadcom LimitedIn Stock: 959HDSP-816E Datasheet

MFR RecommendedRFQ

LDS-C8026RI

Lumex Opto/Components Inc.In Stock: 860LDS-C8026RI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LTS-3403LR are selected based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Display type: 7-Segment LED (single character)
• Common pin configuration: Common Cathode
• Character size: 0.80" (20.32mm)
• Color: Red
• Package family: DIP configuration with 0.600" (15.24mm) pitch

Secondary Compatibility Parameters:

• Forward voltage range: 1.7V to 2.1V (acceptable operating range for common cathode red LEDs)
• Test current: 10mA to 20mA (standard test current range for this display category)
• Wavelength: 635nm to 660nm (red spectrum range)
• Physical dimensions: Height and width within ±0.1" tolerance; depth within ±0.1" tolerance

The two substitute parts listed below meet these criteria and are suitable for direct replacement in applications where the LTS-3403LR is no longer available.

Parameter Comparison

Engineering Selection Recommendations

HDSP-816E (Broadcom Limited): This substitute is an active product with ROHS3 compliance and REACH unaffected status. The HDSP-816E operates at 2.1V forward voltage, which is 0.4V higher than the LTS-3403LR. The package differs: 16-DIP with 12 leads versus the original 18-DIP with 13 leads. This configuration change requires PCB layout modification and pin mapping verification. The higher brightness rating (4.8mcd versus 0.6mcd) and shorter wavelength (635nm versus 655nm) represent measurable optical differences. Selection of this part is appropriate when PCB redesign is feasible and the higher brightness and different wavelength are acceptable for the application.

LDS-C8026RI (Lumex Opto/Components Inc.): This substitute is an active product with ROHS3 compliance and REACH unaffected status. The LDS-C8026RI maintains the same 18-DIP package configuration with 13 leads as the original LTS-3403LR, eliminating the need for PCB layout changes. Forward voltage is 1.8V, only 0.1V higher than the original. Test current is 10mA, half that of the original 20mA specification. The significantly higher brightness rating (24mcd versus 0.6mcd) and wavelength of 660nm (closer to the original 655nm) provide superior optical performance with minimal electrical parameter deviation. Physical dimensions show minor variations in height and depth. Selection of this part is appropriate for direct replacement applications where package compatibility and minimal design changes are priorities.

Frequently Asked Questions (FAQ)

Q: Can the HDSP-816E be used as a direct pin-for-pin replacement for the LTS-3403LR?

A: No. The HDSP-816E uses a 16-DIP package with 12 leads, while the LTS-3403LR uses an 18-DIP package with 13 leads. Pin count and package footprint differ, requiring PCB redesign and pin mapping verification before implementation.

Q: Can the LDS-C8026RI be used as a direct replacement for the LTS-3403LR?

A: Yes, from a package and pin configuration perspective. Both use 18-DIP packages with 13 leads and identical 0.600" pitch. However, electrical parameters differ: forward voltage is 1.8V versus 1.7V, and test current is 10mA versus 20mA. Circuit design must accommodate these differences, particularly in current-limiting resistor calculations.

Q: What are the key differences in brightness between these parts?

A: The LTS-3403LR has a millicandela rating of 0.6mcd. The HDSP-816E provides 4.8mcd (8 times brighter), and the LDS-C8026RI provides 24mcd (40 times brighter). Applications requiring specific brightness levels must account for these differences through circuit design adjustments.

Q: How do the wavelength differences affect part selection?

A: The LTS-3403LR operates at 655nm (red). The HDSP-816E operates at 635nm (orange-red), and the LDS-C8026RI operates at 660nm (deep red). Wavelength differences affect perceived color. The LDS-C8026RI wavelength is closest to the original. Applications with color-critical requirements must evaluate these differences.

Q: What compliance certifications apply to the substitute parts?

A: Both substitute parts carry ROHS3 compliance and REACH unaffected status. The LTS-3403LR has MSL rating of 1 (Unlimited), as do both substitutes. All three parts are classified under ECCN EAR99 and HTSUS 8541.41.0000.

Q: Which substitute part requires the least design modification?

A: The LDS-C8026RI requires the least modification. It maintains identical package configuration (18-DIP, 13 leads) and footprint compatibility with the LTS-3403LR. Only electrical parameter adjustments in the driver circuit are necessary.