NAR105-B 7-Segment LED Display Equivalent & Substitute Parts

Part Overview

The NAR105-B is a single-character, 1-inch red 7-segment LED display module manufactured by Stanley Electric Co. It features a common anode configuration with a forward voltage of 3.4V and operates at 20mA test current. The display is housed in a 14-DIP package with dimensions of 1.299" H × 0.898" W × 0.354" D (33.00mm × 22.80mm × 9.00mm).

The NAR105-B is classified as an obsolete product. Identifying equivalent and substitute parts is necessary for applications requiring continued component availability, design updates, or inventory replenishment where the original part is no longer in active production.

Substiute Parts

NAR105-B

Stanley Electric CoIn Stock: 1129NAR105-B Datasheet

Current PartRFQ

LTS-10804WC

Lite-On Inc.In Stock: 996LTS-10804WC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the NAR105-B is determined by the following critical parameters:

Primary Compatibility Criteria:

• Display Type: 7-Segment LED
• Number of Characters: 1
• Common Pin Configuration: Common Anode
• Color: Red
• Wavelength - Peak: 660nm
• Voltage - Forward (Vf): 3.4V
• Package / Case: 14-DIP
• Physical Dimensions: 1.299" H × 0.898" W × 0.354" D (33.00mm × 22.80mm × 9.00mm)

Secondary Parameters (Allowable Variation):

• Current - Test: May vary within design tolerance
• Millicandela Rating: May vary based on application brightness requirements
• Power Dissipation (Max): Must not exceed system thermal constraints

The LTS-10804WC from Lite-On Inc. meets all primary compatibility criteria. It maintains identical display type, character configuration, common anode topology, color, wavelength, forward voltage, package type, and physical dimensions. The substitute part operates at reduced test current (5mA versus 20mA) and lower millicandela rating (7.5mcd versus 20mcd), making it suitable for applications with lower brightness requirements or reduced power budgets.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (NAR105-B to LTS-10804WC):

The LTS-10804WC is an active product with ROHS3 compliance, providing regulatory advantage over the obsolete NAR105-B. Both parts share identical electrical specifications for forward voltage (3.4V), wavelength (660nm), and maximum power dissipation (120mW). Physical dimensions and package type are equivalent, ensuring mechanical compatibility in existing PCB layouts.

The LTS-10804WC operates at 5mA test current compared to the NAR105-B's 20mA, resulting in lower power consumption and reduced thermal load. The brightness differential (7.5mcd versus 20mcd) must be evaluated against application visibility requirements. Applications requiring the full 20mcd brightness of the original part may necessitate circuit modifications to increase drive current, provided the application's power budget and thermal design accommodate the increased dissipation.

Compliance Considerations:

The LTS-10804WC carries ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, indicating superior environmental handling characteristics compared to the NAR105-B. Both parts share identical ECCN (EAR99) and HTSUS (8541.41.0000) classifications.

Frequently Asked Questions (FAQ)

Q: Can the LTS-10804WC directly replace the NAR105-B without circuit modifications?

A: The LTS-10804WC is mechanically and electrically compatible with the NAR105-B for common anode 14-DIP socket applications. However, the reduced test current (5mA versus 20mA) and brightness (7.5mcd versus 20mcd) require evaluation against application brightness specifications. If the original design relies on the 20mcd brightness output, circuit modifications to increase drive current may be necessary.

Q: Are there package compatibility concerns between these parts?

A: Both parts use 14-DIP packaging with identical physical dimensions (1.299" H × 0.898" W × 0.354" D). The LTS-10804WC specifies 10 leads within the 14-DIP package, while the NAR105-B does not specify lead count. Verify PCB footprint compatibility with the specific lead configuration of the selected substitute.

Q: What is the significance of the product status difference?

A: The NAR105-B is classified as obsolete, indicating discontinued production and limited future availability. The LTS-10804WC is an active product with ongoing manufacturing support, ensuring long-term component availability and supply chain reliability.

Q: How do the electrical specifications compare for circuit design purposes?

A: Both parts operate at identical forward voltage (3.4V) and wavelength (660nm), ensuring compatibility with existing drive circuits designed for common anode 7-segment displays. The primary design consideration is the current differential: the NAR105-B requires 20mA test current while the LTS-10804WC operates at 5mA. Applications with strict brightness requirements must account for the 60% reduction in millicandela rating.

Q: Are there regulatory or compliance advantages to selecting the LTS-10804WC?

A: The LTS-10804WC carries ROHS3 compliance certification, providing regulatory advantage in markets with RoHS requirements. The NAR105-B is listed as REACH Unaffected. Both parts share identical export control classifications (EAR99, HTSUS 8541.41.0000).