SSL-LX15HC-TR Red LED SOT-23-3 Surface Mount Equivalent & Substitute Parts

Part Overview

The SSL-LX15HC-TR is a red LED indicator manufactured by Lumex Opto/Components Inc., designed for discrete indication applications in a compact SOT-23-3 surface mount package. This component features a 2V forward voltage, 2mcd brightness rating, and clear rectangular lens with 140° viewing angle. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing production support, design updates, and inventory management.

Substiute Parts

SSL-LX15HC-TR

Lumex Opto/Components Inc.In Stock: 996SSL-LX15HC-TR Datasheet

Current PartRFQ

SML-LX15HC-TR

Lumex Opto/Components Inc.In Stock: 949SML-LX15HC-TR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SSL-LX15HC-TR is determined by the following critical parameters:

Mandatory Matching Parameters:

• Color: Red
• Lens Transparency: Clear
• Voltage - Forward (Vf): 2V
• Current - Test: 20mA
• Viewing Angle: 140°
• Mounting Type: Surface Mount
• Wavelength - Peak: 700nm
• Package Classification: SOT-23 family (TO-236 variants)
• RoHS Compliance: ROHS3 Compliant

Allowable Variation Parameters:

• Millicandela Rating: Brightness may vary within the red LED indicator category
• Lens Size: Physical dimensions may differ while maintaining functional compatibility
• Height (Max): Package height may vary within SOT-23 specifications
• Moisture Sensitivity Level (MSL): May differ based on storage and handling requirements
• Product Status: Active or obsolete status does not affect electrical substitution

The SML-LX15HC-TR qualifies as a direct substitute based on matching all mandatory parameters while offering improved specifications in brightness (5mcd vs. 2mcd) and moisture sensitivity (MSL 2 vs. MSL 4).

Parameter Comparison

Engineering Selection Recommendations

The SML-LX15HC-TR is a qualified substitute for the SSL-LX15HC-TR based on the following engineering criteria:

Compliance & Regulatory Status: Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity in applications subject to environmental restrictions.

Product Status Consideration: The SSL-LX15HC-TR is classified as obsolete, while the SML-LX15HC-TR maintains active product status. Selection of the active substitute ensures long-term availability and manufacturing support.

Electrical Compatibility: Identical forward voltage (2V), test current (20mA), viewing angle (140°), and peak wavelength (700nm) confirm direct electrical substitution without circuit modification.

Moisture Sensitivity: The SML-LX15HC-TR offers improved moisture sensitivity rating (MSL 2, 1 Year) compared to the main part (MSL 4, 72 Hours), providing enhanced reliability in storage and handling environments.

Brightness Enhancement: The substitute part provides 5mcd brightness versus 2mcd in the original, delivering improved indication visibility without altering electrical characteristics.

Package Compatibility: Both parts utilize SOT-23 family packaging with compatible pinout and footprint, enabling direct PCB placement without layout modification.

Frequently Asked Questions (FAQ)

Q: Can the SML-LX15HC-TR be used as a direct replacement for SSL-LX15HC-TR in existing designs?

A: Yes. Both parts share identical electrical specifications (2V forward voltage, 20mA test current, 140° viewing angle, 700nm peak wavelength) and compatible SOT-23 surface mount packaging. No circuit modifications are required.

Q: What is the significance of the higher millicandela rating (5mcd vs. 2mcd) in the substitute part?

A: The increased brightness rating indicates greater light output intensity. This enhancement does not affect electrical compatibility but provides improved visual indication in the same forward voltage and current operating conditions.

Q: Are there differences in package dimensions between these parts?

A: The lens size differs (SSL-LX15HC-TR: 3.00mm L x 1.50mm W; SML-LX15HC-TR: 2.00mm L x 3.00mm W), and maximum height varies slightly (1.05mm vs. 1.00mm). Both maintain SOT-23 family compatibility. PCB footprint verification is recommended for space-constrained layouts.

Q: Why is the moisture sensitivity level different between the two parts?

A: The SML-LX15HC-TR features improved moisture sensitivity (MSL 2, 1 Year) compared to the SSL-LX15HC-TR (MSL 4, 72 Hours). This indicates the substitute part tolerates longer storage periods without baking requirements, reducing manufacturing process complexity.

Q: Does the obsolete status of SSL-LX15HC-TR affect its electrical performance?

A: No. Obsolete classification indicates end-of-life production status, not performance degradation. However, it necessitates transition to active alternatives like SML-LX15HC-TR for ongoing supply chain continuity.

Q: Are both parts RoHS compliant?

A: Yes. Both SSL-LX15HC-TR and SML-LX15HC-TR are ROHS3 compliant and REACH unaffected, meeting environmental and regulatory requirements for restricted substance use.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes, provided PCB footprint accommodates the lens size variation. The SOT-23 package pinout is compatible, and electrical characteristics are identical. Physical placement verification is necessary for designs with tight component spacing.