NKR105B 7-Segment LED Display - Equivalent & Substitute Parts

Part Overview

The NKR105B is a single-character, 7-segment LED display module manufactured by Stanley Electric Co. It features a 1-inch red LED display in a 14-DIP package configuration with common cathode architecture. The display operates at 3.4V forward voltage with a 20mA test current and produces 20 millicandela output at 660nm peak wavelength.

This part is classified as obsolete. Locating equivalent substitute components is necessary to support ongoing maintenance, repair, and new design requirements where this display type remains functionally appropriate.

Substiute Parts

NKR105B

Stanley Electric CoIn Stock: 1085NKR105B Datasheet

Current PartRFQ

LTS-10304WC

Lite-On Inc.In Stock: 918LTS-10304WC Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the NKR105B is determined by strict alignment across the following critical parameters:

Mandatory Matching Parameters:

• Display Type: 7-Segment (single character only)
• Common Pin Configuration: Common Cathode
• Color: Red
• Package / Case: 14-DIP
• Physical Dimensions: 1.299" H x 0.898" W x 0.354" D (33.00mm x 22.80mm x 9.00mm)
• Digit/Alpha Size: 1.00" (25.40mm)
• Voltage - Forward (Vf) (Typ): 3.4V
• Wavelength - Peak: 660nm
• Power Dissipation (Max): 120mW

Variable Parameters (Allowed to Differ):

• Current - Test: May vary based on LED efficiency and design
• Millicandela Rating: May vary proportionally with current efficiency

The LTS-10304WC from Lite-On Inc. meets all mandatory matching criteria and qualifies as a direct substitute for the NKR105B.

Parameter Comparison

Engineering Selection Recommendations

NKR105B Status Consideration: The NKR105B is classified as obsolete. New designs and replacement applications should transition to active product alternatives where functionally equivalent.

LTS-10304WC Selection Basis: The LTS-10304WC is an active product from Lite-On Inc. and meets all mandatory electrical and mechanical parameters for direct substitution. The LTS-10304WC carries RoHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), providing modern manufacturing standards and supply chain reliability.

Current and Brightness Differential: The LTS-10304WC operates at 5mA test current versus the NKR105B's 20mA, resulting in a proportional reduction in millicandela output (7.5mcd versus 20mcd). This efficiency improvement reduces power consumption while maintaining identical forward voltage and maximum power dissipation ratings. Circuit designs must account for the reduced brightness output when selecting this substitute.

Frequently Asked Questions (FAQ)

Q: Can the LTS-10304WC directly replace the NKR105B in existing circuit boards?

A: The LTS-10304WC is mechanically and electrically compatible with the NKR105B. Both components share identical 14-DIP package dimensions, common cathode configuration, 3.4V forward voltage, and 660nm wavelength. Pin-for-pin substitution is possible. However, the reduced test current (5mA versus 20mA) results in lower brightness output. Circuit designs relying on the original 20mcd brightness specification must be evaluated for the 7.5mcd output of the LTS-10304WC.

Q: What are the key differences between these two parts?

A: The primary differences are current consumption and brightness output. The NKR105B draws 20mA at test conditions and produces 20mcd. The LTS-10304WC draws 5mA and produces 7.5mcd. All other electrical parameters, physical dimensions, and package specifications are identical. The LTS-10304WC represents a more efficient design with lower power consumption.

Q: Are there any compliance or supply chain advantages to using the LTS-10304WC?

A: Yes. The LTS-10304WC is an active product with RoHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), indicating modern manufacturing standards and unrestricted shelf life. The NKR105B is obsolete, making the LTS-10304WC the preferred choice for new designs and long-term supply availability.

Q: Will the LTS-10304WC fit in the same socket or PCB footprint as the NKR105B?

A: Yes. Both components use the 14-DIP package with identical physical dimensions of 1.299" H x 0.898" W x 0.354" D (33.00mm x 22.80mm x 9.00mm). PCB footprints and sockets designed for the NKR105B will accommodate the LTS-10304WC without modification.

Q: What should I consider when substituting the LTS-10304WC for the NKR105B in a design?

A: Verify that the reduced brightness output (7.5mcd versus 20mcd) is acceptable for the intended application. If the original design requires 20mcd brightness, the LTS-10304WC may not meet visibility requirements. Additionally, confirm that the circuit's current-limiting resistor values are appropriate for the 5mA test current specification of the LTS-10304WC to ensure proper LED operation and longevity.