LXA7-PW40-323 Equivalent & Substitute Parts

Part Overview

The LXA7-PW40-323 is a LUXEON R series white neutral LED (4000K) designed for surface mount applications. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The LUXEON R series has been superseded by newer LUXEON TX technology, which maintains functional compatibility while offering improved performance characteristics and active manufacturer support.

Substiute Parts

LXA7-PW40-323

LumiledsIn Stock: 928LXA7-PW40-323 Datasheet

Current PartRFQ

L1T2-4070000002900

LumiledsIn Stock: 998L1T2-4070000002900 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LXA7-PW40-323 is determined by the following critical parameters:

• Color and CCT: Both parts maintain White, Neutral 4000K specification, ensuring identical color temperature output
• Forward Voltage (Vf): LXA7-PW40-323 operates at 2.81V typical; substitute operates at 2.8V typical—a 0.01V variance within acceptable circuit design tolerance
• Test Current: Both parts specify 700mA test current, ensuring equivalent brightness and power consumption characteristics
• Viewing Angle: Both maintain 120° viewing angle for identical light distribution
• CRI: Both maintain CRI 70, preserving color rendering performance
• Compliance: Both are ROHS3 compliant with MSL 1 (Unlimited), meeting identical regulatory and handling requirements
• Mounting Type: Both are surface mount components, compatible with standard PCB assembly processes

The L1T2-4070000002900 (LUXEON TX) represents the manufacturer-recommended active equivalent, offering improved thermal performance and higher luminous efficacy while maintaining functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

The L1T2-4070000002900 (LUXEON TX) is the manufacturer-recommended substitute for the obsolete LXA7-PW40-323. Selection is based on:

• Product Status: The LUXEON TX series is active with ongoing manufacturer support, whereas the LUXEON R series is obsolete
• Regulatory Compliance: Both parts maintain identical ROHS3 and REACH compliance status
• Functional Equivalence: Both parts meet the specified color temperature (4000K), forward voltage (2.8–2.81V), test current (700mA), viewing angle (120°), and CRI (70) requirements
• Thermal Performance: The LUXEON TX offers superior thermal resistance (3°C/W vs. 6°C/W), reducing thermal management requirements in circuit design
• Luminous Efficacy: The LUXEON TX delivers 140 lm/W compared to 109 lm/W, providing 28% higher efficiency at equivalent test current

PCB layout modifications are required due to package geometry differences (1812 to 2-SMD, No Lead Exposed Pad). Thermal design may be simplified due to improved thermal resistance characteristics of the LUXEON TX package.

Frequently Asked Questions (FAQ)

Q: Can the L1T2-4070000002900 directly replace the LXA7-PW40-323 without circuit modifications?

A: Electrical parameters are compatible (forward voltage 2.8V vs. 2.81V, 700mA test current, 120° viewing angle, 4000K color temperature). However, PCB footprint changes from 1812 (4532 Metric) to 2-SMD, No Lead Exposed Pad require layout redesign. Thermal design may be simplified due to improved thermal resistance.

Q: What is the significance of the MacAdam Ellipse specification difference?

A: The LXA7-PW40-323 specifies 5-Step MacAdam Ellipse; the L1T2-4070000002900 specifies 3-Step MacAdam Ellipse. Both maintain 4000K color temperature. The 3-Step specification indicates tighter color consistency control in the LUXEON TX series.

Q: Are there compliance or handling differences between these parts?

A: Both parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating. No differences in compliance or handling requirements exist.

Q: Why does the LUXEON TX have higher luminous flux at the same test current?

A: The L1T2-4070000002900 delivers 275lm at 85°C versus 215lm for the LXA7-PW40-323, representing improved LED die efficiency and optical design in the newer LUXEON TX series. This results in 140 lm/W versus 109 lm/W efficiency.

Q: What are the package dimension implications for PCB design?

A: The LXA7-PW40-323 measures 4.49mm x 3.05mm (1812 package); the L1T2-4070000002900 measures 3.70mm x 3.70mm (2-SMD package). The substitute is smaller in one dimension but larger in the perpendicular dimension. Height specifications are nearly identical (2.10mm vs. 2.12mm). Footprint redesign is required.