QTLP321CY Yellow LED Through-Hole Equivalent & Substitute Parts

Part Overview

The QTLP321CY is a yellow power LED manufactured by onsemi, designed for indication applications in through-hole mounting configurations. This component features a 589nm dominant wavelength with a 2.2V forward voltage and 70mA test current, housed in a 4-DIP (0.200", 5.08mm) package with a 3.00mm domed lens. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

QTLP321CY

onsemiIn Stock: 1078QTLP321CY Datasheet

Current PartRFQ

SSL-LX30448SYC

Lumex Opto/Components Inc.In Stock: 1011SSL-LX30448SYC Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the QTLP321CY is determined by the following critical parameters:

• Package type: 4-DIP (0.200", 5.08mm) through-hole configuration
• Color specification: Yellow indication LED
• Wavelength range: 589-590nm dominant/peak wavelength
• Lens geometry: 3.00mm diameter round domed lens
• Electrical characteristics: Forward voltage 2.2V nominal, test current 70mA
• Viewing angle: 50° standard
• Physical dimensions: 7.62mm L x 7.62mm W footprint with maximum height 6.50mm

The SSL-LX30448SYC from Lumex Opto/Components Inc. qualifies as a substitute based on matching package type, color, wavelength specification, lens geometry, viewing angle, and physical dimensions. Electrical parameters remain within acceptable tolerance ranges for indication applications.

Parameter Comparison

Engineering Selection Recommendations

The SSL-LX30448SYC provides a direct substitute for the obsolete QTLP321CY based on mechanical and optical compatibility. The substitute maintains identical package configuration, lens specifications, and wavelength characteristics required for yellow indication applications.

The SSL-LX30448SYC carries active product status with RoHS3 compliance, providing long-term availability and regulatory alignment. Both components share MSL 1 (Unlimited) moisture sensitivity classification and REACH Unaffected status.

Forward voltage differential of 0.05V (2.2V to 2.25V) and test current reduction from 70mA to 20mA reflect typical manufacturing variations within the yellow LED category and do not preclude substitution in indication circuits. Circuit design must accommodate the lower test current specification of the substitute part.

Frequently Asked Questions (FAQ)

Q: Can the SSL-LX30448SYC directly replace the QTLP321CY in existing PCB designs?

A: Yes. Both components use identical 4-DIP (0.200", 5.08mm) through-hole package configuration with matching footprint dimensions (7.62mm L x 7.62mm W). No PCB layout modifications are required.

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

A: The primary differences are product status (obsolete vs. active), forward voltage (2.2V vs. 2.25V), and test current specification (70mA vs. 20mA). Wavelength, lens geometry, viewing angle, and package type remain identical.

Q: Are there compliance or regulatory considerations for substitution?

A: The SSL-LX30448SYC is RoHS3 compliant and REACH Unaffected, providing regulatory alignment for new designs. Both components maintain MSL 1 (Unlimited) classification.

Q: How should the lower test current of the substitute part affect circuit design?

A: The SSL-LX30448SYC operates at 20mA test current versus 70mA for the original part. Circuit current-limiting resistor values must be recalculated based on the substitute part's electrical characteristics to maintain proper LED brightness and operating conditions.

Q: Is the SSL-LX30448SYC available in inventory?

A: Yes. 972 pieces of the SSL-LX30448SYC are available as new original stock.