LDS-C3912RI Equivalent & Substitute Parts

Part Overview

The LDS-C3912RI is a green 7-segment LED display module manufactured by Lumex Opto/Components Inc. This single-character display operates as a common cathode configuration with a 0.39" digit height, designed for numeric and alphanumeric applications. The component is Active status and ROHS3 compliant, making it suitable for current production environments. Substitute parts may be required due to inventory constraints, design modifications requiring different electrical characteristics, or package compatibility considerations in specific applications.

Substiute Parts

LDS-C3912RI

Lumex Opto/Components Inc.In Stock: 1091LDS-C3912RI Datasheet

Current PartRFQ

SA36-11CGKWA

KingbrightIn Stock: 1507SA36-11CGKWA Datasheet

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SA36-11GWA

KingbrightIn Stock: 998SA36-11GWA Datasheet

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SA39-12GWA

KingbrightIn Stock: 1417SA39-12GWA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LDS-C3912RI is determined by the following critical parameters:

Display Characteristics: All substitute parts must be 7-segment, single-character green LED displays with matching digit height (0.39" / 10.00mm) and identical physical dimensions (0.512" H x 0.394" W x 0.276" D).

Electrical Compatibility: Substitute parts must operate within compatible voltage ranges (forward voltage 2.1V to 2.2V) and current specifications (10mA to 20mA test current). The wavelength peak must remain in the green spectrum (565nm to 574nm).

Package Configuration: All substitutes must use 10-DIP packaging with 0.300" (7.62mm) pin spacing to ensure direct PCB compatibility.

Common Pin Configuration: The LDS-C3912RI uses common cathode configuration. Substitute parts with common anode configuration (SA36-11CGKWA, SA36-11GWA, SA39-12GWA) require circuit redesign and are not direct pin-compatible substitutes. These parts are listed as cross-references for design flexibility only.

Compliance Requirements: All substitute parts must maintain ROHS3 compliance, REACH unaffected status, and MSL 1 rating to ensure regulatory and environmental compatibility.

Parameter Comparison

Engineering Selection Recommendations

Direct Pin-Compatible Substitute: SA39-12GWA is the only Kingbright part that matches the physical dimensions (0.512" H x 0.394" W x 0.276" D) and package pin spacing (10-DIP 0.300", 7.62mm) of the LDS-C3912RI. However, SA39-12GWA uses common anode configuration versus the common cathode configuration of LDS-C3912RI, requiring circuit redesign for compatibility.

Dimensional Incompatibility: SA36-11CGKWA and SA36-11GWA feature smaller digit height (0.36" versus 0.39") and different physical dimensions (0.551" H x 0.295" W x 0.335" D), with 10-DIP package pin spacing of 0.200" (5.08mm) instead of 0.300" (7.62mm). These parts are not suitable for direct PCB substitution in designs requiring the LDS-C3912RI footprint.

Compliance Status: All listed substitute parts maintain Active product status, ROHS3 compliance, REACH unaffected designation, and MSL 1 rating, ensuring regulatory alignment with the main part.

Electrical Considerations: Substitute parts operate at higher test currents (20mA versus 10mA) and lower maximum power dissipation (62.5mW to 75mW versus 105mW), indicating different LED efficiency characteristics. Forward voltage remains compatible at 2.1V to 2.2V range.

Frequently Asked Questions (FAQ)

Q: Can SA39-12GWA directly replace LDS-C3912RI in existing designs?

A: SA39-12GWA matches the physical dimensions and package pin spacing of LDS-C3912RI. However, SA39-12GWA uses common anode configuration while LDS-C3912RI uses common cathode configuration. Direct substitution requires circuit redesign to reverse the polarity and current-limiting logic.

Q: Why are SA36-11CGKWA and SA36-11GWA listed as substitutes if they have different dimensions?

A: These parts are listed as cross-reference alternatives for design flexibility in applications where digit height reduction (0.36" versus 0.39") is acceptable. They are not suitable for direct PCB substitution due to different physical dimensions and package pin spacing (0.200" versus 0.300").

Q: What are the key electrical differences between LDS-C3912RI and SA39-12GWA?

A: LDS-C3912RI operates at 10mA test current with 105mW maximum power dissipation, while SA39-12GWA operates at 20mA test current with 62.5mW maximum power dissipation. Both maintain 2.2V forward voltage and 565nm wavelength peak. The higher current requirement of SA39-12GWA reflects different LED chip efficiency.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. LDS-C3912RI and all listed substitute parts (SA36-11CGKWA, SA36-11GWA, SA39-12GWA) are ROHS3 compliant with REACH unaffected status and MSL 1 rating.

Q: What is the primary limitation preventing SA36-11 series parts from direct substitution?

A: SA36-11CGKWA and SA36-11GWA have different physical dimensions (0.551" H x 0.295" W x 0.335" D versus 0.512" H x 0.394" W x 0.276" D) and package pin spacing (10-DIP 0.200" versus 10-DIP 0.300"), making them incompatible with PCB designs requiring LDS-C3912RI footprint.

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

A: LDS-C3912RI has 3.5mcd brightness. SA36-11CGKWA provides 11mcd (higher brightness), SA36-11GWA provides 3.5mcd (matching), and SA39-12GWA provides 6.4mcd (moderate increase). Brightness differences reflect LED chip variations and may affect visual performance in specific lighting conditions.