SLR-325VCT31 Equivalent & Substitute Parts

Part Overview

The SLR-325VCT31 is a red LED indication component manufactured by Rohm Semiconductor, designed for through-hole mounting applications. This part is classified as "Not For New Designs," indicating it has reached end-of-life status. Organizations currently using this component in active production or maintenance applications require qualified substitute parts that maintain functional compatibility while ensuring continued supply availability.

Substiute Parts

SLR-325VCT31

Rohm SemiconductorIn Stock: 1138SLR-325VCT31 Datasheet

Current PartRFQ

LTL-709E

Lite-On Inc.In Stock: 3289LTL-709E Datasheet

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LTL-816EE

Lite-On Inc.In Stock: 927LTL-816EE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SLR-325VCT31 are qualified based on the following critical parameters:

Electrical Compatibility: Forward voltage (2V typical) and test current (10mA) must match or be compatible with existing circuit designs. Red color specification (wavelength range 623nm–635nm) ensures visual consistency in indication applications.

Mechanical Compatibility: Through-hole mounting type is mandatory. Lens size (3.20mm diameter) and lens style (round with domed top) determine physical fit within PCB layouts and enclosure apertures. Height specifications affect clearance in compact assemblies.

Regulatory Compliance: RoHS3 compliance and REACH status are evaluated for supply chain and environmental requirements.

Availability & Status: Active product status indicates ongoing manufacturing and supply chain support, addressing the obsolescence risk of the SLR-325VCT31.

Parameter Comparison

Engineering Selection Recommendations

LTL-709E (Lite-On Inc.): This substitute maintains electrical compatibility (2V forward voltage, 10mA test current) and red wavelength specification (623nm dominant, 635nm peak). However, the 1.80mm lens diameter is significantly smaller than the SLR-325VCT31's 3.20mm specification, and the diffused lens transparency differs from the clear lens of the main part. The reduced height (3.60mm vs. 5.70mm) may affect PCB layout fit. This part is suitable only where lens size reduction and diffused appearance are acceptable. Product status is Active, ensuring supply continuity.

LTL-816EE (Lite-On Inc.): This substitute provides exact lens size match (3.20mm diameter) and maintains red color with clear/tinted lens transparency. Electrical parameters differ: test current is specified at 30mA (versus 10mA for the main part), and millicandela rating is higher at 29mcd (versus 16mcd). Forward voltage remains 2V. The higher brightness and current rating indicate this part is suitable for applications where increased luminous intensity is acceptable or beneficial. Product status is Active, ensuring supply continuity. Moisture Sensitivity Level is 2A (4 Weeks), compared to MSL 1 (Unlimited) for the main part.

Compliance: Both substitute parts are ROHS3 compliant and carry EAR99 ECCN classification, matching the regulatory profile of the SLR-325VCT31.

Frequently Asked Questions (FAQ)

Q: Can LTL-709E be used as a direct replacement for SLR-325VCT31?

A: LTL-709E maintains electrical compatibility (2V, 10mA) and red wavelength specification. However, the 1.80mm lens diameter is substantially smaller than the 3.20mm requirement, and the diffused lens differs from the clear lens. Physical fit within PCB apertures and visual appearance will differ. Evaluation is required for specific applications.

Q: What is the primary difference between LTL-709E and LTL-816EE?

A: LTL-709E features a 1.80mm lens diameter with diffused transparency and 12.6mcd brightness at 10mA test current. LTL-816EE features a 3.20mm lens diameter matching the main part, with clear/tinted transparency and 29mcd brightness at 30mA test current. LTL-816EE provides closer mechanical compatibility but with higher brightness and current consumption.

Q: Does the higher current rating of LTL-816EE (30mA vs. 10mA) affect circuit compatibility?

A: The 30mA specification for LTL-816EE represents the test current parameter, not a requirement. This part can operate at lower currents. However, brightness output will scale with applied current. Circuit designs must accommodate the higher brightness potential and verify that current-limiting resistors are appropriately sized for the intended operating point.

Q: Are there packaging differences between these substitutes?

A: SLR-325VCT31 is supplied in Tape & Box (TB) packaging. LTL-709E is supplied in Bulk packaging. LTL-816EE packaging is not specified in available data. Procurement and handling procedures may differ accordingly.

Q: What is the impact of the diffused lens on LTL-709E compared to the clear lens on SLR-325VCT31?

A: Diffused lenses scatter light over a wider area, reducing peak brightness in the direct viewing direction but improving visibility from off-axis angles. Clear lenses concentrate light in the forward direction. Visual appearance and perceived brightness will differ in the application.

Q: Are all three parts RoHS3 compliant?

A: Yes. SLR-325VCT31, LTL-709E, and LTL-816EE are all ROHS3 compliant, meeting environmental and regulatory requirements for lead-free manufacturing.