LTST-C190CBKT Equivalent & Substitute Parts

Part Overview

The LTST-C190CBKT is a blue 470nm LED indication component in 0603 (1608 Metric) surface mount package, rated at 3.7V forward voltage with 20mcd luminous intensity. This part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. The obsolete status necessitates evaluation of compatible alternatives that maintain functional equivalence within the specified electrical and mechanical parameters.

Key Parameters

Parameter	Value
Color	Blue
Wavelength - Dominant	470nm
Package / Case	0603 (1608 Metric)
Mounting Type	Surface Mount
Voltage - Forward (Vf) (Typ)	3.7V
Current - Test	20mA
Viewing Angle	130°
Lens Style	Rectangle with Flat Top
Millicandela Rating	20mcd
Size / Dimension	1.60mm L x 0.80mm W
Height (Max)	0.90mm
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the LTST-C190CBKT is determined by strict alignment across the following critical parameters:

Color specification: Blue
Wavelength - Dominant: 470nm
Package / Case: 0603 (1608 Metric)
Mounting Type: Surface Mount
Lens Style: Rectangle with Flat Top
Size / Dimension: 1.60mm L x 0.80mm W
Height (Max): 0.90mm
Moisture Sensitivity Level (MSL): 3 (168 Hours)

The LTST-C190TBKT qualifies as a direct substitute based on matching all mandatory mechanical and optical parameters. Variations in forward voltage (3.3V vs. 3.7V), millicandela rating (104mcd vs. 20mcd), and product status do not preclude substitution when circuit design accommodates the electrical differences.

Parameter Comparison

Parameter	LTST-C190CBKT (Main)	LTST-C190TBKT (Substitute)
Manufacturer	Lite-On Inc.	Lite-On Inc.
Color	Blue	Blue
Wavelength - Dominant	470nm	470nm
Wavelength - Peak	468nm	468nm
Package / Case	0603 (1608 Metric)	0603 (1608 Metric)
Mounting Type	Surface Mount	Surface Mount
Voltage - Forward (Vf) (Typ)	3.7V	3.3V
Current - Test	20mA	20mA
Viewing Angle	130°	130°
Lens Color	Colorless	Colorless
Lens Transparency	Clear	Clear
Lens Style	Rectangle with Flat Top	Rectangle with Flat Top
Lens Size	1.06mm x 0.80mm	1.10mm x 0.80mm
Millicandela Rating	20mcd	104mcd
Size / Dimension	1.60mm L x 0.80mm W	1.60mm L x 0.80mm W
Height (Max)	0.90mm	0.90mm
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Active
RoHS Status	Not specified	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The LTST-C190TBKT is the qualified substitute for the obsolete LTST-C190CBKT. Selection of this substitute is supported by:

Active product status ensuring continued availability and supply chain stability
ROHS3 compliance meeting current regulatory requirements
Identical mechanical footprint and mounting characteristics
Matching optical wavelength and viewing angle specifications
Equivalent moisture sensitivity classification

The forward voltage differential (3.3V vs. 3.7V) requires circuit-level evaluation to confirm compatibility with existing current-limiting resistor values and power supply specifications. The increased millicandela rating (104mcd vs. 20mcd) provides enhanced luminous intensity, which may necessitate adjustment of series resistor values to maintain equivalent brightness in the application.

Frequently Asked Questions (FAQ)

Q: Can LTST-C190TBKT be used as a direct drop-in replacement for LTST-C190CBKT?

A: Mechanical and optical compatibility is confirmed. Electrical compatibility requires verification that the circuit design accommodates the 3.3V forward voltage specification and the higher 104mcd luminous intensity. Series resistor adjustment may be necessary.

Q: What is the primary reason for substitution?

A: The LTST-C190CBKT is obsolete. The LTST-C190TBKT maintains functional equivalence across all critical parameters while offering active product status and current regulatory compliance.

Q: Are the package dimensions identical?

A: Yes. Both parts use 0603 (1608 Metric) surface mount package with identical footprint dimensions of 1.60mm L x 0.80mm W and maximum height of 0.90mm.

Q: How do the forward voltage specifications differ?

A: LTST-C190CBKT operates at 3.7V typical forward voltage, while LTST-C190TBKT operates at 3.3V typical forward voltage. This 0.4V difference affects circuit design calculations for current-limiting resistors.

Q: Is the wavelength specification maintained?

A: Yes. Both parts specify 470nm dominant wavelength and 468nm peak wavelength, ensuring identical color characteristics.

Q: What is the impact of the increased millicandela rating?

A: LTST-C190TBKT provides 104mcd compared to 20mcd for the original part. This increased brightness may require series resistor adjustment to maintain equivalent visual indication levels in the application.

Q: Are there compliance differences between the two parts?

A: LTST-C190TBKT carries ROHS3 compliance certification. Both parts maintain REACH Unaffected status and equivalent moisture sensitivity levels.

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