SLR-325YYT31 Equivalent & Substitute Parts

Part Overview

The SLR-325YYT31 is a yellow diffused LED indicator from Rohm Semiconductor, designed for through-hole mounting applications requiring yellow light indication at 587nm wavelength. This component operates at 2.1V forward voltage with a 6.3mcd brightness rating and 40° viewing angle. The part is classified as "Not For New Designs," making identification of functionally equivalent alternatives essential for ongoing production support and design flexibility.

Substiute Parts

SLR-325YYT31

Rohm SemiconductorIn Stock: 1216SLR-325YYT31 Datasheet

Current PartRFQ

LTL-709Y

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SLR-325YYT31 is determined by the following critical parameters:

Electrical Compatibility:

• Forward voltage (Vf) must match at 2.1V to ensure proper operation in existing circuits without modification
• Test current of 10mA establishes the baseline brightness specification
• Wavelength dominance in the yellow spectrum (587–588nm range) maintains color consistency

Optical Characteristics:

• Diffused lens transparency is required for uniform light distribution
• Millicandela rating determines brightness; substitutes must provide equivalent or greater luminous intensity
• Viewing angle tolerance of ±2° is acceptable for indicator applications

Mechanical & Package Requirements:

• Through-hole radial mounting configuration must be preserved
• Lens size and overall height variations are acceptable within standard PCB layout tolerances
• T-1 package form factor compatibility

Compliance & Status:

• RoHS3 compliance is mandatory for current production
• Active product status is preferred to ensure long-term availability

The LTL-709Y from Lite-On Inc. meets these substitution criteria with compatible electrical parameters and active product status.

Parameter Comparison

Engineering Selection Recommendations

The LTL-709Y is a direct electrical substitute for the SLR-325YYT31 based on matching forward voltage, test current, and wavelength specifications. The substitute offers the additional advantage of active product status, ensuring continued availability and supply chain stability compared to the original part's "Not For New Designs" classification.

Physical differences exist: the LTL-709Y features a smaller lens diameter (1.80mm vs. 3.20mm) and reduced overall height (3.60mm vs. 5.70mm). These dimensional variations may affect visual prominence and PCB layout compatibility. Brightness is higher in the substitute (12.6mcd vs. 6.3mcd), which may require circuit-level current limiting adjustments if exact luminous intensity is critical to the application.

Both parts maintain ROHS3 compliance and are suitable for production environments requiring regulatory adherence.

Frequently Asked Questions (FAQ)

Q: Can the LTL-709Y replace the SLR-325YYT31 in existing designs without circuit modification?

A: Electrical substitution is direct due to matching 2.1V forward voltage and 10mA test current. However, the higher brightness rating (12.6mcd vs. 6.3mcd) may require current limiting adjustment if the circuit was optimized for the original part's luminous intensity. Physical dimensions differ, requiring PCB layout verification.

Q: What is the significance of the wavelength difference (587nm vs. 588nm)?

A: The 1nm difference is within acceptable tolerance for yellow LED indication. Both wavelengths fall within the yellow spectrum and are visually indistinguishable in indicator applications.

Q: Why is the LTL-709Y smaller than the SLR-325YYT31?

A: Lens size and overall height are design variations between manufacturers. The smaller form factor of the LTL-709Y may provide layout advantages but requires verification that the reduced lens diameter does not impact the desired visual appearance or light distribution in the application.

Q: Are both parts RoHS compliant?

A: Yes, both the SLR-325YYT31 and LTL-709Y are ROHS3 compliant, meeting current environmental and regulatory requirements.

Q: What is the advantage of using the LTL-709Y over the original part?

A: The LTL-709Y carries "Active" product status, ensuring long-term availability and supply continuity. The original SLR-325YYT31 is classified as "Not For New Designs," indicating potential discontinuation or limited future support.

Q: Are there any compliance differences between the two parts?

A: Both parts are ROHS3 compliant with matching HTSUS codes (8541.41.0000) and ECCN classification (EAR99). The LTL-709Y is REACH Affected, while the SLR-325YYT31 is REACH Unaffected; however, this does not affect substitution suitability for most applications.