LTS-3403LWC Equivalent & Substitute Parts

Part Overview

The LTS-3403LWC is a 7-segment LED display module manufactured by Lite-On Inc., featuring a single red character with 0.80" digit height in a 17-DIP package configuration. 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 configuration with 1.7V forward voltage and 5mA test current, suitable for numeric and alphanumeric display applications.

Substiute Parts

LTS-3403LWC

Lite-On Inc.In Stock: 1184LTS-3403LWC Datasheet

Current PartRFQ

LDS-C814RI

Lumex Opto/Components Inc.In Stock: 984LDS-C814RI Datasheet

MFR RecommendedRFQ

LDS-C815RI

Lumex Opto/Components Inc.In Stock: 1003LDS-C815RI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LTS-3403LWC are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Primary Compatibility Criteria:

• Display Type: 7-Segment LED configuration
• Number of Characters: Single character (1)
• Digit Height: 0.80" (20.32mm)
• Color: Red
• Common Pin Configuration: Common Cathode
• Package Type: DIP format with 0.600" (15.24mm) pitch and 13 leads
• Physical Dimensions: Equivalent form factor within manufacturing tolerances

Electrical Parameter Ranges:

• Forward Voltage (Vf): Acceptable range 1.7V to 2.0V for common cathode red LEDs
• Test Current: 5mA to 10mA operational range
• Wavelength: Red spectrum 635nm to 700nm
• Power Dissipation: Up to 120mW maximum

The substitute parts LDS-C814RI and LDS-C815RI from Lumex Opto/Components Inc. meet these criteria with compatible electrical characteristics and identical mechanical form factors, though packaged in 16-DIP configuration with equivalent lead count and spacing.

Parameter Comparison

Engineering Selection Recommendations

LDS-C814RI Selection Criteria: The LDS-C814RI is an active product from Lumex Opto/Components Inc. with ROHS3 compliance and REACH unaffected status. This substitute provides higher brightness (5.6mcd) compared to the obsolete LTS-3403LWC (3.75mcd) with a shorter wavelength peak at 635nm. The forward voltage increase from 1.7V to 2.0V and doubled test current (10mA vs 5mA) require circuit design adjustment but remain within standard LED driver specifications. Physical dimensions are equivalent within manufacturing tolerances.

LDS-C815RI Selection Criteria: The LDS-C815RI is an active product with identical electrical specifications to LDS-C814RI (2.0V forward voltage, 10mA test current) but features a longer wavelength peak at 700nm and significantly lower brightness (0.9mcd). This substitute is suitable for applications where reduced brightness is acceptable or preferred. ROHS3 compliance and REACH unaffected status are maintained.

Compliance and Availability: Both substitute parts maintain ROHS3 compliance and are classified as active products with current inventory availability, addressing the obsolescence status of the LTS-3403LWC. The 16-DIP package configuration with 13 leads provides mechanical compatibility with existing PCB layouts designed for the 17-DIP original part.

Frequently Asked Questions (FAQ)

Q: Can LDS-C814RI and LDS-C815RI be used interchangeably with LTS-3403LWC?

A: Both Lumex substitutes are mechanically and functionally compatible as common cathode 7-segment red LED displays with 0.80" digit height. However, circuit design modifications are required due to increased forward voltage (2.0V vs 1.7V) and doubled test current (10mA vs 5mA). The choice between LDS-C814RI and LDS-C815RI depends on brightness requirements: LDS-C814RI provides higher brightness (5.6mcd) at 635nm wavelength, while LDS-C815RI offers lower brightness (0.9mcd) at 700nm wavelength.

Q: What are the package differences between the main part and substitutes?

A: The LTS-3403LWC uses a 17-DIP package, while both LDS-C814RI and LDS-C815RI use 16-DIP packages. Both configurations maintain 0.600" (15.24mm) pitch spacing and 13 functional leads. Physical dimensions are equivalent within manufacturing tolerances (approximately 27.7mm H x 20mm W x 8.4mm D), ensuring compatibility with existing PCB footprints.

Q: Are there compliance or regulatory differences?

A: All three parts maintain ROHS3 compliance. The substitute parts additionally specify REACH unaffected status, providing enhanced regulatory documentation for applications requiring comprehensive compliance verification.

Q: What electrical adjustments are needed when substituting?

A: The forward voltage increase from 1.7V to 2.0V and current increase from 5mA to 10mA require recalculation of series resistor values in the LED driver circuit. Current-limiting resistor values must be adjusted to maintain proper brightness and prevent LED damage. Consult the specific datasheet for each substitute part to determine appropriate resistor values for your operating voltage.

Q: Which substitute should be selected for new designs?

A: For new designs, either LDS-C814RI or LDS-C815RI is appropriate based on brightness requirements. LDS-C814RI is recommended for applications requiring brightness comparable to or exceeding the original part. LDS-C815RI is suitable for applications where reduced brightness is acceptable or where wavelength at 700nm is preferred for specific visibility conditions.