LAP-401YN 7-Segment Yellow LED Display - Equivalent & Substitute Parts

Part Overview

The LAP-401YN is a single-character 7-segment yellow LED display manufactured by Rohm Semiconductor, housed in a 10-DIP package with 0.40" digit height. This component is classified as Not For New Designs, indicating it has reached end-of-life status. The display operates at 1.9V forward voltage with 10mA test current and delivers 450mcd brightness at 590nm wavelength peak emission.

Due to its discontinued status, identifying functionally equivalent substitute components is essential for maintenance, repair, and legacy system support where direct replacement is required.

Substiute Parts

LAP-401YN

Rohm SemiconductorIn Stock: 979LAP-401YN Datasheet

Current PartRFQ

SC39-12YWA

KingbrightIn Stock: 1126SC39-12YWA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LAP-401YN is determined by the following critical parameters:

• Display Architecture: 7-segment, single-character configuration
• Common Pin Type: Common cathode topology
• Color Specification: Yellow emission (590nm wavelength)
• Package Format: 10-DIP (0.300", 7.62mm) pin spacing
• Electrical Compatibility: Forward voltage and test current within acceptable operating ranges for legacy circuit integration
• Physical Form Factor: Overall dimensions and digit height suitable for PCB mounting and visual integration

The SC39-12YWA from Kingbright meets these core substitution criteria. While minor variations exist in forward voltage (2.1V vs. 1.9V), test current (20mA vs. 10mA), and brightness rating (3mcd vs. 450mcd), the component maintains functional equivalence in display type, package, common cathode configuration, and yellow color specification. These electrical differences require circuit-level verification but do not preclude substitution in legacy applications.

Parameter Comparison

Engineering Selection Recommendations

The SC39-12YWA qualifies as a functional substitute for the LAP-401YN based on matching display architecture, common cathode configuration, yellow color specification, and 10-DIP package format. Both components maintain ROHS3 compliance and are suitable for legacy system applications.

Selection between these components should account for the following factors:

• Product Availability: The LAP-401YN is classified Not For New Designs; the SC39-12YWA maintains active production status, ensuring long-term supply continuity.
• Electrical Parameter Variance: The SC39-12YWA operates at 2.1V forward voltage and 20mA test current compared to the LAP-401YN's 1.9V and 10mA specifications. Existing circuit designs must be evaluated to confirm that current-limiting resistor values and power supply characteristics accommodate these differences without exceeding component ratings.
• Brightness Differential: The SC39-12YWA exhibits significantly lower brightness (3mcd vs. 450mcd). Applications requiring high visibility or long viewing distances may experience reduced display legibility. Dimly-lit or close-proximity viewing environments may tolerate this reduction.
• Compliance Certification: Both components satisfy ROHS3 requirements and REACH compliance, supporting regulatory continuity in legacy system maintenance.

Frequently Asked Questions (FAQ)

Q: Can the SC39-12YWA be directly soldered into a PCB designed for the LAP-401YN without circuit modification?

A: Physical pin compatibility exists due to identical 10-DIP package format and pin spacing. However, electrical compatibility requires verification. The SC39-12YWA's higher forward voltage (2.1V vs. 1.9V) and increased test current (20mA vs. 10mA) may alter circuit behavior. Existing current-limiting resistor values must be recalculated to ensure proper segment illumination and prevent component overstress. Direct substitution without circuit analysis is not recommended.

Q: Why does the SC39-12YWA have significantly lower brightness than the LAP-401YN?

A: The millicandela rating reflects the luminous intensity per unit area under specified test conditions. The SC39-12YWA's 3mcd rating versus the LAP-401YN's 450mcd indicates substantially different LED die characteristics and optical design. This difference is inherent to the component design and cannot be altered through circuit adjustment alone.

Q: Are there dimensional differences that affect PCB layout?

A: The SC39-12YWA is 0.016" (0.4mm) wider than the LAP-401YN (0.394" vs. 0.378"). Height and depth dimensions are identical. This minor width variance is unlikely to cause PCB layout conflicts in most applications, but should be verified against specific board constraints and component spacing requirements.

Q: Do both components use the same pin configuration?

A: Yes. Both the LAP-401YN and SC39-12YWA are common cathode 7-segment displays in 10-DIP packages with identical pin assignments. Pin-to-pin compatibility is confirmed.

Q: What is the significance of the LAP-401YN being classified as "Not For New Designs"?

A: This designation indicates the component has reached end-of-life status and is no longer recommended for new product development. Existing inventory may remain available for a limited period, but long-term supply cannot be guaranteed. The SC39-12YWA's active production status makes it the preferred choice for ongoing system support and maintenance.

Q: Can circuit design accommodate the electrical differences between these components?

A: Yes, with proper engineering analysis. The forward voltage and current differences can be managed through resistor recalculation and power supply verification. However, this requires detailed circuit schematic review and testing to confirm performance meets application requirements.