SLR-325YCT31 Equivalent & Substitute Parts

Part Overview

The SLR-325YCT31 is a yellow LED indicator from Rohm Semiconductor designed for through-hole applications. This component features a 587nm dominant wavelength with 16mcd brightness and a clear lens. The part is classified as "Not For New Designs," making identification of suitable alternatives essential for ongoing production and maintenance applications. The radial package configuration and 2.1V forward voltage rating establish the baseline for equivalent component selection.

Substiute Parts

SLR-325YCT31

Rohm SemiconductorIn Stock: 991SLR-325YCT31 Datasheet

Current PartRFQ

LTL-709Y

Lite-On Inc.In Stock: 15659LTL-709Y Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SLR-325YCT31 is determined by the following critical parameters:

• Color and Wavelength: Yellow indication (587nm dominant wavelength range)
• Forward Voltage: 2.1V typical operating voltage
• Test Current: 10mA standard test condition
• Mounting Configuration: Through-hole radial package
• Regulatory Compliance: ROHS3 compliance requirement

The LTL-709Y from Lite-On Inc. qualifies as a substitute based on matching color, forward voltage, test current, mounting type, and package configuration. Minor variations in lens transparency (diffused vs. clear), millicandela rating (12.6mcd vs. 16mcd), lens size, and viewing angle fall within acceptable tolerance ranges for indicator applications where the primary function is visual notification rather than precision optical performance.

Parameter Comparison

Engineering Selection Recommendations

The LTL-709Y is a valid substitute for the SLR-325YCT31 based on electrical parameter alignment and regulatory compliance. Both components meet ROHS3 requirements and operate at identical forward voltage and test current specifications. The LTL-709Y carries Active product status, providing supply continuity advantages over the SLR-325YCT31's "Not For New Designs" classification.

Design considerations for substitution include the reduction in millicandela rating (12.6mcd vs. 16mcd) and the change from clear to diffused lens transparency. These differences may affect visual brightness perception and light distribution characteristics in the application. The LTL-709Y's reduced physical height (3.60mm vs. 5.70mm) requires verification against PCB layout and mechanical clearance requirements.

Frequently Asked Questions (FAQ)

Q: Can the LTL-709Y directly replace the SLR-325YCT31 in existing designs?

A: Electrical compatibility is confirmed through matching forward voltage (2.1V), test current (10mA), and radial through-hole package configuration. Physical height difference (3.60mm vs. 5.70mm) and lens transparency change (diffused vs. clear) require design review for mechanical fit and optical performance validation.

Q: What is the significance of the wavelength difference between 587nm and 588nm?

A: Both wavelengths fall within the yellow indication spectrum and are visually indistinguishable to the human eye. The 1nm difference represents normal manufacturing variation within the yellow LED category.

Q: Why does the LTL-709Y have lower millicandela rating?

A: The 12.6mcd rating of the LTL-709Y compared to 16mcd of the SLR-325YCT31 reflects different optical design parameters. The diffused lens of the LTL-709Y distributes light over a wider area, resulting in lower peak intensity at the optical axis while maintaining adequate brightness for indicator applications.

Q: Are there packaging differences between these components?

A: The SLR-325YCT31 is supplied in Tape & Box packaging, while the LTL-709Y is supplied in Bulk packaging. Both use radial through-hole configuration compatible with standard PCB assembly processes.

Q: What compliance certifications apply to both parts?

A: Both the SLR-325YCT31 and LTL-709Y are ROHS3 compliant and carry ECCN EAR99 classification. The LTL-709Y is REACH Affected, while the SLR-325YCT31 is REACH Unaffected.