SML-LXLC1206SYC-TR Yellow LED 1206 SMD Equivalent & Substitute Parts

Part Overview

The SML-LXLC1206SYC-TR is a yellow LED indication component manufactured by Lumex Opto/Components Inc. in 1206 (3216 Metric) surface mount package format. This discrete yellow LED operates at 2V forward voltage with a 350mcd brightness rating and 70° viewing angle, designed for standard indication applications. The component is Active status and RoHS3 compliant.

Substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or inventory depletion. Alternative manufacturers offer equivalent yellow LEDs in the same 1206 package with comparable electrical and mechanical specifications, enabling design flexibility and supply chain continuity.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Package / Case	1206 (3216 Metric)	—	Critical - Physical footprint compatibility
Mounting Type	Surface Mount	—	Critical - Assembly process compatibility
Color	Yellow	—	Critical - Optical output specification
Lens Transparency	Clear	—	Critical - Optical transmission
Voltage - Forward (Vf) (Typ)	2V	V	Critical - Circuit design parameter
Current - Test	20mA	mA	Critical - Operating current specification
Wavelength - Peak	590nm	nm	Important - Color consistency
Millicandela Rating	350mcd	mcd	Important - Brightness level
Viewing Angle	70°	degrees	Important - Visibility range
RoHS Status	ROHS3 Compliant	—	Critical - Regulatory compliance
Moisture Sensitivity Level (MSL)	3 (168 Hours)	—	Important - Storage and handling requirements

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following mandatory parameters:

Critical Parameters (Must Match):

Package / Case: 1206 (3216 Metric)
Mounting Type: Surface Mount
Color: Yellow
Lens Transparency: Clear
Voltage - Forward (Vf) (Typ): 2V nominal
Current - Test: 20mA
RoHS Status: ROHS3 Compliant

Important Parameters (Should Align):

Wavelength - Peak: 590nm ±5nm acceptable range
Millicandela Rating: 350mcd ±20% acceptable variance
Viewing Angle: 70° ±10° acceptable variance
Moisture Sensitivity Level (MSL): 3 (168 Hours)

The substitute parts listed below meet all critical parameters. Variations in brightness (mcd) and viewing angle represent acceptable engineering tolerances for indication LED applications where the primary function is visual status signaling rather than precision illumination.

Parameter Comparison

Parameter	SML-LXLC1206SYC-TR (Lumex)	25-21UYC/S530-A2/TR8 (Everlight)	APTD3216SYCK (Kingbright)	APTD3216YC (Kingbright)	APTL3216SYCK (Kingbright)
Manufacturer	Lumex Opto/Components Inc.	Everlight Electronics Co Ltd	Kingbright	Kingbright	Kingbright
Package / Case	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)
Supplier Device Package	SMD	2-SMD	2-SMD	2-SMD	Chip LED
Color	Yellow	Yellow	Yellow	Yellow	Yellow
Lens Transparency	Clear	Clear	Clear	Clear	Clear
Voltage - Forward (Vf) (Typ)	2V	2V	2V	2.1V	2V
Current - Test	20mA	20mA	20mA	20mA	20mA
Wavelength - Peak	590nm	591nm	590nm	590nm	590nm
Wavelength - Dominant	—	589nm	590nm	588nm	590nm
Millicandela Rating	350mcd	45mcd	800mcd	40mcd	350mcd
Viewing Angle	70°	60°	35°	35°	70°
Lens Style	Round with Flat Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Flat Top
Lens Size	1.60mm Dia	1.10mm Dia	1.60mm Dia	1.60mm Dia	1.60mm Dia
Size / Dimension	3.20mm L x 1.60mm W	3.20mm L x 1.60mm W	3.20mm L x 1.60mm W	3.20mm L x 1.60mm W	3.20mm L x 1.60mm W
Height (Max)	1.10mm	1.20mm	1.90mm	1.90mm	1.10mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Equivalent: APTL3216SYCK (Kingbright)

The APTL3216SYCK provides the closest parametric match to the SML-LXLC1206SYC-TR. Both components share identical electrical specifications (2V forward voltage, 20mA test current, 350mcd brightness), identical viewing angle (70°), identical wavelength (590nm peak), and identical physical dimensions (3.20mm L x 1.60mm W, 1.10mm max height). Both feature round flat-top lens design and are RoHS3 compliant with MSL 3 rating. The primary difference is the supplier device package designation (Chip LED vs. SMD), which does not affect circuit-level compatibility. This part is recommended as the first substitute choice.

Secondary Equivalent: APTD3216SYCK (Kingbright)

The APTD3216SYCK maintains critical electrical compatibility (2V, 20mA, 590nm) and package dimensions. However, it exhibits higher brightness (800mcd vs. 350mcd) and narrower viewing angle (35° vs. 70°). This part is suitable for applications where increased brightness is acceptable or beneficial, but not recommended where the 70° viewing angle is a design requirement. Height is increased to 1.90mm maximum.

Conditional Equivalent: 25-21UYC/S530-A2/TR8 (Everlight)

The 25-21UYC/S530-A2/TR8 meets all critical electrical parameters (2V, 20mA, yellow, clear lens, RoHS3, MSL 3). Wavelength is 591nm peak (within acceptable tolerance). However, brightness is significantly reduced (45mcd vs. 350mcd) and viewing angle is narrower (60° vs. 70°). This part is suitable only for applications where lower brightness is acceptable and the 60° viewing angle meets functional requirements.

Conditional Equivalent: APTD3216YC (Kingbright)

The APTD3216YC exhibits slightly elevated forward voltage (2.1V vs. 2V nominal) and significantly reduced brightness (40mcd vs. 350mcd). Viewing angle is narrower (35° vs. 70°). This part is suitable only for applications with relaxed brightness requirements and where the 2.1V forward voltage is compatible with circuit design. Not recommended as a general substitute.

All substitute parts maintain RoHS3 compliance, MSL 3 rating, and Active product status, ensuring regulatory and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can APTD3216SYCK be used as a direct replacement for SML-LXLC1206SYC-TR?

A: APTD3216SYCK is electrically compatible (2V, 20mA, 590nm yellow) and physically compatible (1206 package, 3.20mm x 1.60mm footprint). However, it differs in brightness (800mcd vs. 350mcd) and viewing angle (35° vs. 70°). Use this part only if increased brightness is acceptable and the narrower viewing angle does not compromise application requirements.

Q: What is the difference between APTL3216SYCK and APTD3216SYCK?

A: Both are Kingbright yellow LEDs in 1206 package with 2V forward voltage and 20mA test current. APTL3216SYCK (Chip LED package) matches the original part exactly: 350mcd brightness, 70° viewing angle, 1.10mm height, flat-top lens. APTD3216SYCK (2-SMD package) has higher brightness (800mcd), narrower viewing angle (35°), and greater height (1.90mm) with domed-top lens.

Q: Is the 25-21UYC/S530-A2/TR8 suitable for high-brightness applications?

A: No. The 25-21UYC/S530-A2/TR8 has significantly lower brightness (45mcd) compared to the original SML-LXLC1206SYC-TR (350mcd). This part is suitable only for applications where lower brightness is acceptable or where power consumption reduction is prioritized.

Q: Do all substitute parts have the same moisture sensitivity level?

A: Yes. All listed substitute parts have MSL 3 (168 Hours) rating, identical to the original SML-LXLC1206SYC-TR. Storage and handling requirements are equivalent across all parts.

Q: Can APTD3216YC replace SML-LXLC1206SYC-TR in a 3.3V circuit?

A: APTD3216YC has 2.1V forward voltage (vs. 2V for the original). In a 3.3V circuit, this represents a 0.1V increase in voltage drop, which may be acceptable depending on current-limiting resistor design. However, the significantly reduced brightness (40mcd vs. 350mcd) makes this part unsuitable for most indication applications requiring the original brightness level.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (APTL3216SYCK, APTD3216SYCK, APTD3216YC, and 25-21UYC/S530-A2/TR8) are RoHS3 compliant, matching the original SML-LXLC1206SYC-TR compliance status.

Q: What is the primary reason to choose APTL3216SYCK over other substitutes?

A: APTL3216SYCK provides the closest parametric match: identical brightness (350mcd), identical viewing angle (70°), identical wavelength (590nm), identical forward voltage (2V), identical physical dimensions, and identical lens style (flat-top). It is the recommended first-choice substitute.

Q: Do substitute parts fit the same PCB footprint?

A: Yes. All substitute parts use the 1206 (3216 Metric) package with identical land pattern dimensions (3.20mm L x 1.60mm W). PCB footprint compatibility is maintained across all parts. Height variations (1.10mm to 1.90mm) do not affect footprint compatibility but may affect clearance in confined spaces.

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