LTS-3731E 7-Segment LED Display - Equivalent & Substitute Parts

Part Overview

The LTS-3731E is a single-character 7-segment LED display module manufactured by Lite-On Inc., featuring a 0.43" orange-red display in a 14-DIP package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The display operates at 2V forward voltage with a 20mA test current and is suitable for numeric and alphanumeric display applications requiring common anode configuration.

Substiute Parts

LTS-3731E

Lite-On Inc.In Stock: 1195LTS-3731E Datasheet

Current PartRFQ

LDS-A414BI

Lumex Opto/Components Inc.In Stock: 1043LDS-A414BI Datasheet

DirectRFQ

LDS-A414RI

Lumex Opto/Components Inc.In Stock: 1649LDS-A414RI Datasheet

DirectRFQ

SA43-11EWA

KingbrightIn Stock: 3504SA43-11EWA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LTS-3731E are qualified based on the following critical parameters that determine functional compatibility:

• Display Type: 7-Segment configuration (required for alphanumeric display capability)
• Number of Characters: Single character (1)
• Digit Size: 0.43" nominal dimension
• Common Pin Configuration: Common Anode (determines circuit interface requirements)
• Voltage - Forward (Typ): 2V (electrical interface compatibility)
• Current - Test: 20mA (circuit design parameter)
• Package / Case: 14-DIP (0.300", 7.62mm) (mechanical and electrical pinout compatibility)
• Wavelength Range: 625nm to 635nm (acceptable color spectrum variation for red/orange-red applications)

All substitute parts maintain these core parameters within acceptable engineering tolerances. Variations in millicandela rating and power dissipation do not affect substitutability when the above parameters are matched.

Parameter Comparison

Engineering Selection Recommendations

LDS-A414RI (Lumex Opto/Components Inc.) is the primary direct substitute. This part maintains identical electrical specifications (2V, 20mA, 14-DIP package) and common anode configuration. The component is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. Higher millicandela rating (3.9mcd vs. 2.2mcd) provides improved brightness margin. Maximum power dissipation of 105mW remains within acceptable circuit design parameters for applications originally specified for 75mW.

SA43-11EWA (Kingbright) is the manufacturer-recommended substitute. This part matches all critical electrical and mechanical parameters with identical 2V forward voltage, 20mA test current, and 14-DIP package configuration. Active product status with ROHS3 compliance ensures long-term availability. Power dissipation specification of 75mW matches the original component exactly. Highest millicandela rating (6.9mcd) among available substitutes provides maximum brightness performance.

LDS-A414BI (Lumex Opto/Components Inc.) is an alternative substitute with identical core specifications. This part maintains 2V forward voltage, 20mA test current, and 14-DIP package compatibility. Active production status and ROHS3 compliance are confirmed. Wavelength peak of 625nm represents the shortest wavelength among available options, producing a slightly deeper red appearance compared to the original orange-red specification.

All three substitute parts are qualified for direct replacement based on matching display type, character count, digit size, common anode configuration, voltage, current, and package specifications.

Frequently Asked Questions (FAQ)

Q: Can LDS-A414RI be used as a direct replacement for LTS-3731E?

A: Yes. LDS-A414RI maintains all critical substitution parameters: 7-segment display type, single character, 0.43" digit size, common anode configuration, 2V forward voltage, 20mA test current, and 14-DIP (0.300", 7.62mm) package. Pinout compatibility is confirmed. Higher brightness (3.9mcd vs. 2.2mcd) and increased power dissipation (105mW vs. 75mW) do not prevent substitution in standard circuit applications.

Q: What is the difference between the red and orange-red color specifications?

A: Color difference is determined by wavelength peak specification. LTS-3731E operates at 630nm (orange-red), while substitute parts operate at 625nm to 635nm (red spectrum). These wavelength variations produce visually distinct colors. Applications requiring exact color matching to the original orange-red specification should evaluate visual appearance in the target application before production deployment.

Q: Are all substitute parts RoHS compliant?

A: Yes. LDS-A414RI, LDS-A414BI, and SA43-11EWA are all ROHS3 compliant. The original LTS-3731E RoHS status is not specified in available documentation.

Q: Do the substitute parts have identical pinout configurations?

A: Yes. All substitute parts use 14-DIP (0.300", 7.62mm) package configuration with common anode pin arrangement. LDS-A414RI specifies 11 leads within the 14-DIP package; this does not affect compatibility with standard 14-DIP socket applications.

Q: Which substitute part should be selected for new designs?

A: SA43-11EWA is recommended for new designs. This part is manufacturer-recommended, maintains exact power dissipation specification (75mW), offers highest brightness (6.9mcd), and is in active production with confirmed long-term availability and ROHS3 compliance.

Q: Can brightness differences affect circuit operation?

A: No. Brightness differences (measured in millicandela) do not affect electrical circuit operation or compatibility. Higher brightness ratings provide improved visibility margin but do not require circuit modification. Applications with specific brightness requirements should evaluate actual luminous intensity in the target environment.

Q: What is the moisture sensitivity level (MSL) rating?

A: All parts, including the original LTS-3731E and all substitutes, carry MSL 1 (Unlimited) rating. This indicates unlimited shelf life without moisture control requirements during storage and handling.