NAR141B 7-Segment LED Display - Equivalent & Substitute Parts

Part Overview

The NAR141B is a single-character red 7-segment LED display manufactured by Stanley Electric Co. This component is classified as obsolete, making equivalent substitute parts necessary for new designs, production continuity, and system upgrades. The display operates as a common anode configuration with a 0.43-inch character height, suitable for numeric and alphanumeric applications requiring red LED indication at 1.7V forward voltage and 20mA test current.

Substiute Parts

NAR141B

Stanley Electric CoIn Stock: 1056NAR141B Datasheet

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HDSP-E151

Broadcom LimitedIn Stock: 1379HDSP-E151 Datasheet

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LDS-A406RI

Lumex Opto/Components Inc.In Stock: 1116LDS-A406RI Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the NAR141B are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Primary Compatibility Criteria:

• Display type: 7-Segment configuration
• Number of characters: Single character
• Common pin configuration: Common Anode
• Color: Red
• Package type: 14-DIP
• Character height: 0.43" nominal (±0.03" tolerance acceptable)
• Forward voltage: 1.7V to 1.8V range
• Test current: 10mA to 20mA range

Secondary Compatibility Factors:

• Physical dimensions within ±0.05" variance
• Wavelength peak in red spectrum (645nm to 660nm)
• Power dissipation within component thermal design limits
• Compliance certifications (RoHS, REACH)

Substitutes must maintain common anode architecture to ensure direct pin-compatible replacement without circuit redesign. Voltage and current parameters must fall within acceptable operating ranges for existing driver circuits.

Parameter Comparison

Engineering Selection Recommendations

HDSP-E151 (Broadcom Limited) is the primary substitute for NAR141B applications. This part maintains active product status with ROHS3 compliance certification. Physical dimensions are within 0.002" to 0.008" of the original part across all axes. Forward voltage of 1.8V represents a 0.1V increase, which is acceptable within standard LED driver circuit tolerances. The 15mcd brightness rating provides enhanced luminous intensity compared to the original 8mcd specification. Pin configuration remains 14-DIP common anode, ensuring direct circuit compatibility without modification.

LDS-A406RI (Lumex Opto/Components Inc.) serves as an alternative substitute where lower current consumption is advantageous. This part operates at 10mA test current versus the original 20mA, reducing power dissipation by 40mW. Character height of 0.40" represents a 0.03" reduction from the original specification, which may impact visual consistency in multi-digit display arrays. Forward voltage matches the original 1.7V specification exactly. ROHS3 compliance and active product status support long-term supply chain continuity. Physical width is reduced to 0.386" compared to the original 0.492", requiring verification of mechanical fit in existing PCB layouts.

Both substitutes maintain common anode configuration and 14-DIP package type, eliminating the need for circuit redesign or PCB rework.

Frequently Asked Questions (FAQ)

Q: Can HDSP-E151 replace NAR141B in existing designs without circuit modification?

A: Yes. The HDSP-E151 maintains common anode configuration, 14-DIP package type, and compatible voltage/current parameters. The 0.1V increase in forward voltage falls within standard LED driver circuit operating margins. No circuit redesign is required.

Q: What is the primary difference between HDSP-E151 and LDS-A406RI substitutes?

A: HDSP-E151 matches the original 20mA test current and maintains nearly identical physical dimensions (0.750" H vs. 0.748" H original). LDS-A406RI operates at 10mA test current with reduced character height (0.40" vs. 0.43" original) and narrower width (0.386" vs. 0.492" original). HDSP-E151 is preferred for direct mechanical and electrical replacement; LDS-A406RI is suitable where lower power consumption and compact width are design priorities.

Q: Are physical dimension differences between substitutes critical?

A: HDSP-E151 dimensions vary by less than 0.01" from the original NAR141B, making it suitable for direct PCB mounting without layout modification. LDS-A406RI width reduction of 0.106" may require PCB layout verification to confirm mechanical clearance and alignment with adjacent components. Character height reduction of 0.03" may affect visual uniformity in multi-digit display applications.

Q: Do substitute parts meet current regulatory compliance requirements?

A: Both HDSP-E151 and LDS-A406RI carry ROHS3 compliance certification and REACH Unaffected status, meeting current environmental and hazardous substance regulations. The original NAR141B does not specify RoHS status, making active-status substitutes preferable for new production and long-term supply chain compliance.

Q: What is the brightness difference between NAR141B and substitute parts?

A: NAR141B operates at 8mcd. HDSP-E151 provides 15mcd (87.5% increase), and LDS-A406RI provides 9.8mcd (22.5% increase). Higher brightness in HDSP-E151 may require current-limiting resistor adjustment in existing circuits to maintain consistent display intensity. LDS-A406RI brightness is comparable to the original specification.

Q: Can LDS-A406RI be used in applications requiring 20mA operation?

A: LDS-A406RI is specified for 10mA test current. Operating at 20mA would exceed the component's rated power dissipation (100mW maximum) and may reduce component lifespan. Use HDSP-E151 for applications requiring 20mA operation.

Q: Are there pin-count differences between substitutes?

A: HDSP-E151 uses 11 leads within a 14-DIP package; LDS-A406RI uses 10 leads within a 14-DIP package. Both maintain common anode 14-DIP configuration compatible with NAR141B pinout. Verify specific pin assignments in component datasheets before PCB layout finalization.