SSL-LX15YC-TR Yellow LED SOT-23-3 Equivalent & Substitute Parts

Part Overview

The SSL-LX15YC-TR is a yellow LED indicator manufactured by Lumex Opto/Components Inc., designed for surface mount applications in the SOT-23-3 package. This component features a clear lens with a rectangular flat-top design and operates at a forward voltage of 2.1V with a test current of 20mA. The part is currently classified as obsolete, which necessitates identification of active equivalent alternatives to maintain design continuity and ensure supply chain availability for new production runs and legacy system support.

Key Parameters

Parameter	Value
Manufacturer	Lumex Opto/Components Inc.
Color	Yellow
Lens Transparency	Clear
Millicandela Rating	10mcd
Voltage - Forward (Vf) (Typ)	2.1V
Current - Test	20mA
Viewing Angle	140°
Mounting Type	Surface Mount
Wavelength - Peak	585nm
Package / Case	TO-236-3, SC-59, SOT-23-3
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution eligibility for the SSL-LX15YC-TR is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

Manufacturer: Lumex Opto/Components Inc.
Color: Yellow
Lens Transparency: Clear
Voltage - Forward (Vf) (Typ): 2.1V
Current - Test: 20mA
Viewing Angle: 140°
Mounting Type: Surface Mount
Package / Case: SOT-23-3 variant
RoHS Status: ROHS3 Compliant
REACH Status: REACH Unaffected

Allowable Parameter Variations:

Millicandela Rating: Substitutes may differ from 10mcd
Wavelength - Peak: Substitutes may vary within yellow spectrum range
Lens Size: Minor dimensional variations permitted within SOT-23-3 envelope
Height (Max): Variations within package specification limits
Moisture Sensitivity Level (MSL): May differ based on packaging and storage conditions
Product Status: Active substitutes preferred over obsolete

The identified substitute parts SML-LX15YC-TR and SML-LX15SYC-TR maintain all mandatory parameters while offering active product status and improved supply availability.

Parameter Comparison

Parameter	SSL-LX15YC-TR (Main)	SML-LX15YC-TR (Direct Substitute)	SML-LX15SYC-TR (Similar Substitute)
Manufacturer	Lumex Opto/Components Inc.	Lumex Opto/Components Inc.	Lumex Opto/Components Inc.
Product Status	Obsolete	Active	Active
Color	Yellow	Yellow	Yellow
Lens Transparency	Clear	Clear	Clear
Millicandela Rating	10mcd	10mcd	60mcd
Voltage - Forward (Vf) (Typ)	2.1V	2.1V	2.1V
Current - Test	20mA	20mA	20mA
Viewing Angle	140°	140°	140°
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Wavelength - Peak	585nm	585nm	590nm
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236, SC-59, SOT-23-3 variant	TO-236, SC-59, SOT-23-3 variant
Supplier Device Package	SOT-23-3	SOT-23	SOT-23
Size / Dimension	3.00mm L x 1.50mm W	3.00mm L x 3.00mm W	3.00mm L x 3.00mm W
Height (Max)	1.05mm	1.00mm	1.00mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	4 (72 Hours)	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Packaging	Bulk	Tape & Reel (TR)	Tape & Reel (TR)
Inventory Status	2800 Pcs New Original In Stock	3530 Pcs New Original In Stock	4158 Pcs New Original In Stock

Engineering Selection Recommendations

SML-LX15YC-TR is the primary direct substitute for SSL-LX15YC-TR. This part maintains identical electrical characteristics (2.1V forward voltage, 20mA test current, 10mcd brightness, 585nm peak wavelength) and optical properties (140° viewing angle, clear lens, yellow color). Both parts comply with ROHS3 and REACH requirements. The SML-LX15YC-TR offers the advantage of active product status with higher inventory availability (3530 Pcs vs. 2800 Pcs). The improved moisture sensitivity level (MSL 3 vs. MSL 4) provides extended storage capability. Dimensional variations in lens size (2.00mm x 3.00mm vs. 3.00mm x 1.50mm) and height (1.00mm vs. 1.05mm) remain within SOT-23-3 package envelope specifications and do not affect electrical or optical performance.

SML-LX15SYC-TR is a compatible alternative with enhanced brightness characteristics. This part maintains all mandatory electrical and optical parameters but provides 60mcd brightness compared to the 10mcd rating of the main part. The peak wavelength shifts to 590nm, remaining within the yellow spectrum. This substitute is suitable for applications requiring increased luminous intensity while maintaining identical forward voltage, test current, and viewing angle specifications. The higher inventory level (4158 Pcs) and active product status support supply chain continuity.

Both substitute parts are packaged in Tape & Reel format, which is standard for production environments and offers superior handling and placement efficiency compared to bulk packaging.

Frequently Asked Questions (FAQ)

Q: Can SML-LX15YC-TR be used as a direct replacement for SSL-LX15YC-TR in existing designs?

A: Yes. SML-LX15YC-TR maintains identical electrical specifications (2.1V forward voltage, 20mA test current), optical properties (10mcd, 140° viewing angle, 585nm peak wavelength), and compliance certifications (ROHS3, REACH). The part operates identically in circuit applications designed for SSL-LX15YC-TR.

Q: What are the physical differences between SSL-LX15YC-TR and SML-LX15YC-TR?

A: The lens dimensions differ (SSL-LX15YC-TR: 3.00mm L x 1.50mm W; SML-LX15YC-TR: 3.00mm L x 3.00mm W) and maximum height varies slightly (1.05mm vs. 1.00mm). Both remain within SOT-23-3 package specifications. Moisture sensitivity level improves from MSL 4 to MSL 3, extending storage capability from 72 hours to 168 hours.

Q: When should SML-LX15SYC-TR be selected instead of SML-LX15YC-TR?

A: SML-LX15SYC-TR is selected when increased brightness is required. This part provides 60mcd compared to 10mcd in both SSL-LX15YC-TR and SML-LX15YC-TR, while maintaining identical forward voltage, test current, and viewing angle. The peak wavelength shifts to 590nm, remaining within the yellow spectrum range.

Q: Are there any compliance or regulatory differences between the main part and substitutes?

A: No. All three parts (SSL-LX15YC-TR, SML-LX15YC-TR, and SML-LX15SYC-TR) are ROHS3 Compliant and REACH Unaffected. They share identical ECCN (EAR99) and HTSUS (8541.41.0000) classifications.

Q: What is the significance of the product status difference?

A: SSL-LX15YC-TR is classified as obsolete, indicating discontinued manufacturing and limited future availability. SML-LX15YC-TR and SML-LX15SYC-TR are active products with ongoing production and established supply chains, ensuring long-term component availability for new designs and production continuity.

Q: How do packaging differences affect component selection?

A: SSL-LX15YC-TR is supplied in bulk packaging, while SML-LX15YC-TR and SML-LX15SYC-TR are supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for automated surface mount assembly, offering superior handling, placement accuracy, and production efficiency. Bulk packaging is typically used for manual assembly or small-volume applications.

Q: Can these parts be used interchangeably in PCB designs?

A: SML-LX15YC-TR can be used interchangeably with SSL-LX15YC-TR without design modifications, as electrical and optical specifications are identical. SML-LX15SYC-TR requires circuit design consideration due to its 60mcd brightness rating; current-limiting resistor values may require adjustment to maintain appropriate brightness levels in the application.

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