LTST-020KGKT Equivalent & Substitute Parts

Part Overview

The LTST-020KGKT is an active green LED indication component manufactured by Lite-On Inc., designed for surface mount right-angle applications. This part operates at a forward voltage of 2.1V with a test current of 20mA and delivers 118mcd luminous intensity at a dominant wavelength of 571nm. The component is packaged in a 2-SMD, No Lead configuration with clear colorless lens and rectangular flat-top lens style.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the allowed parameter tolerances for this product category. The primary substitute listed maintains functional equivalence while offering alternative packaging and availability options.

Key Parameters

Parameter	Value	Unit
Color	Green	-
Voltage - Forward (Vf) (Typ)	2.1	V
Current - Test	20	mA
Millicandela Rating	118	mcd
Wavelength - Dominant	571	nm
Wavelength - Peak	574	nm
Viewing Angle	110	°
Mounting Type	Surface Mount, Right Angle	-
Lens Color	Colorless	-
Lens Transparency	Clear	-
Lens Style	Rectangle with Flat Top	-
Package / Case	2-SMD, No Lead	-
Size / Dimension	3.80mm L x 1.20mm W	-
Height (Max)	0.60	mm
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	3 (168 Hours)	-
Product Status	Active	-

Substitute Part Grouping Explanation

Substitution eligibility for the LTST-020KGKT is determined by the following critical parameters:

Electrical Compatibility: Forward voltage (Vf) tolerance, test current rating, and wavelength range (dominant and peak) must support equivalent circuit operation. The green color specification (dominant wavelength 571nm) defines the optical category.

Mechanical Compatibility: Mounting type (surface mount), lens configuration (clear colorless with rectangular flat-top style), and physical dimensions must accommodate the intended PCB layout and optical requirements.

Regulatory Compliance: RoHS3 compliance and MSL rating (3, 168 Hours) are mandatory for equivalent substitution.

The substitute part SML-LX1206GC-TR1 (Lumex Opto/Components Inc.) qualifies as an equivalent based on matching color specification, clear lens transparency, rectangular flat-top lens style, surface mount configuration, and identical regulatory compliance status. Packaging format differs (Tape & Reel vs. Cut Tape) and dimensional specifications vary, requiring PCB design verification.

Parameter Comparison

Parameter	LTST-020KGKT (Lite-On)	SML-LX1206GC-TR1 (Lumex)
Manufacturer	Lite-On Inc.	Lumex Opto/Components Inc.
Color	Green	Green
Voltage - Forward (Vf) (Typ)	2.1V	2.2V
Current - Test	20mA	20mA
Millicandela Rating	118mcd	10mcd
Wavelength - Peak	574nm	565nm
Viewing Angle	110°	125°
Mounting Type	Surface Mount, Right Angle	Surface Mount
Lens Color	Colorless	Colorless
Lens Transparency	Clear	Clear
Lens Style	Rectangle with Flat Top	Rectangle with Flat Top
Package / Case	2-SMD, No Lead	1206 (3216 Metric)
Size / Dimension	3.80mm L x 1.20mm W	3.20mm L x 1.60mm W
Height (Max)	0.60mm	1.23mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
Product Status	Active	Active

Engineering Selection Recommendations

Both the LTST-020KGKT and SML-LX1206GC-TR1 maintain active product status with identical RoHS3 compliance and MSL ratings, confirming regulatory equivalence for new designs and production environments.

The LTST-020KGKT operates at 2.1V forward voltage with 118mcd luminous intensity and a 110° viewing angle. The SML-LX1206GC-TR1 operates at 2.2V forward voltage with 10mcd luminous intensity and a 125° viewing angle. Both components share green color specification, clear colorless lens, rectangular flat-top lens style, and surface mount configuration.

Selection between these parts depends on circuit voltage tolerance, required luminous intensity, viewing angle requirements, and PCB footprint constraints. The LTST-020KGKT features a lower profile (0.60mm max height) compared to the SML-LX1206GC-TR1 (1.23mm max height). Packaging availability differs: LTST-020KGKT is supplied in Cut Tape format; SML-LX1206GC-TR1 is supplied in Tape & Reel format.

Frequently Asked Questions (FAQ)

Q: Can SML-LX1206GC-TR1 directly replace LTST-020KGKT in existing designs?

A: Direct replacement requires PCB layout verification. The SML-LX1206GC-TR1 has different dimensions (3.20mm L x 1.60mm W vs. 3.80mm L x 1.20mm W) and greater height (1.23mm vs. 0.60mm). Forward voltage differs by 0.1V (2.2V vs. 2.1V), requiring circuit validation. Luminous intensity is significantly lower (10mcd vs. 118mcd), which may affect optical performance.

Q: What are the key electrical differences between these parts?

A: The LTST-020KGKT operates at 2.1V with 118mcd output; the SML-LX1206GC-TR1 operates at 2.2V with 10mcd output. Both are rated for 20mA test current. Peak wavelengths differ slightly (574nm vs. 565nm), both within the green spectrum. Viewing angles differ (110° vs. 125°).

Q: Are both parts RoHS3 compliant?

A: Yes, both LTST-020KGKT and SML-LX1206GC-TR1 are ROHS3 compliant with identical MSL ratings of 3 (168 Hours).

Q: What packaging formats are available?

A: LTST-020KGKT is supplied in Cut Tape (CT) format. SML-LX1206GC-TR1 is supplied in Tape & Reel (TR) format. Packaging selection affects procurement and assembly processes.

Q: How do the physical dimensions affect PCB design?

A: LTST-020KGKT dimensions are 3.80mm L x 1.20mm W with 0.60mm max height. SML-LX1206GC-TR1 dimensions are 3.20mm L x 1.60mm W with 1.23mm max height. The Lumex part is wider and significantly taller, requiring footprint redesign and clearance verification for mechanical constraints.

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