SLR-325MCT31 Equivalent & Substitute Parts

Part Overview

The SLR-325MCT31 is a green LED indicator manufactured by Rohm Semiconductor, designed for through-hole applications with a 3.20mm domed lens. This component operates at 2.1V forward voltage with a 25mcd brightness rating and 572nm dominant wavelength. The part carries a "Not For New Designs" status, making identification of functionally equivalent alternatives essential for ongoing production and maintenance applications. Substitute parts must maintain compatibility across electrical characteristics, mechanical form factor, and mounting requirements.

Substiute Parts

SLR-325MCT31

Rohm SemiconductorIn Stock: 26408SLR-325MCT31 Datasheet

Current PartRFQ

LTL-816GE

Lite-On Inc.In Stock: 1167LTL-816GE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SLR-325MCT31 are identified based on the following critical parameters:

• Color: Green LED indication
• Wavelength Range: 565nm to 572nm (green spectrum)
• Forward Voltage: 2.1V nominal operation
• Lens Geometry: 3.20mm diameter, round domed top
• Mounting Configuration: Through-hole radial package
• Brightness Class: 25mcd to 29mcd range
• Compliance: ROHS3 compliant, EAR99 classification

The LTL-816GE from Lite-On Inc. meets these substitution criteria with compatible electrical and mechanical specifications, enabling direct replacement in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: LTL-816GE (Lite-On Inc.)

The LTL-816GE qualifies as a direct substitute based on:

• Identical forward voltage (2.1V) and mechanical form factor (3.20mm domed lens, through-hole radial mount)
• Green wavelength compatibility within the 565nm–572nm range
• Brightness rating (29mcd) within acceptable tolerance of the original 25mcd specification
• Active product status, ensuring ongoing availability and supply chain stability
• ROHS3 compliance and matching HTSUS classification (8541.41.0000)

The LTL-816GE's higher current rating (30mA vs. 10mA test current) and slightly narrower viewing angle (35° vs. 40°) do not preclude substitution when circuit design accommodates these parameters. The higher brightness output may provide improved visibility in certain applications.

Frequently Asked Questions (FAQ)

Q: Can the LTL-816GE replace the SLR-325MCT31 in existing PCB designs?

A: Yes. Both components share identical forward voltage (2.1V), lens diameter (3.20mm), lens style (round domed top), and through-hole radial mounting configuration. No PCB layout modifications are required.

Q: What is the wavelength difference between 572nm and 565nm?

A: Both wavelengths fall within the green LED spectrum and are visually indistinguishable to the human eye. The 7nm difference represents normal manufacturing variation within green LED production.

Q: Why is the LTL-816GE rated for 30mA while the SLR-325MCT31 specifies 10mA test current?

A: The test current represents the measurement condition, not the maximum operating limit. The LTL-816GE's higher current rating indicates greater design margin and potential for higher brightness operation. Circuit design must respect the actual current-limiting resistor values in the application.

Q: Does the 5° difference in viewing angle (40° vs. 35°) affect compatibility?

A: No. The LTL-816GE's 35° viewing angle is narrower but remains suitable for standard indicator applications. Applications requiring the full 40° field should be evaluated individually.

Q: Are both parts RoHS compliant?

A: Yes. Both the SLR-325MCT31 and LTL-816GE carry ROHS3 compliance certification, meeting environmental and regulatory requirements.

Q: What is the product status difference between the two parts?

A: The SLR-325MCT31 carries "Not For New Designs" status, indicating end-of-life or obsolescence. The LTL-816GE maintains "Active" status, ensuring continued manufacturing and supply availability for new and existing applications.