LTST-C190UBKT Equivalent & Substitute Parts

Part Overview

The LTST-C190UBKT is a blue LED indication component manufactured by Lite-On Inc., designed for discrete surface mount applications in the 0603 (1608 Metric) package format. This part operates at a forward voltage of 3.8V with a dominant wavelength of 466nm and provides 4.5mcd luminous intensity. The product is currently classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

LTST-C190UBKT

Lite-On Inc.In Stock: 1231LTST-C190UBKT Datasheet

Current PartRFQ

LTST-C190TBKT

Lite-On Inc.In Stock: 29505LTST-C190TBKT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The LTST-C190TBKT qualifies as a direct substitute based on the following critical parameters:

Mechanical Compatibility: Both parts share identical package specifications (0603 / 1608 Metric), mounting type (Surface Mount), physical dimensions (1.60mm L x 0.80mm W), maximum height (0.90mm), lens style (Rectangle with Flat Top), and moisture sensitivity level (MSL 3).

Electrical Compatibility: Both components operate within the same test current specification (20mA) and maintain the same viewing angle (130°). The forward voltage differs slightly (3.8V vs. 3.3V) and the dominant wavelength shifts from 466nm to 470nm, both within the blue LED spectrum range. The substitute part provides significantly higher luminous intensity (104mcd vs. 4.5mcd).

Regulatory & Compliance: The substitute part holds Active product status with RoHS3 compliance certification, ensuring long-term availability and regulatory alignment.

Parameter Comparison

Engineering Selection Recommendations

The LTST-C190TBKT is the designated manufacturer substitute for the obsolete LTST-C190UBKT. Selection of this substitute is supported by:

Product Availability: The substitute maintains Active product status with 29,400 units in stock, ensuring reliable procurement against the obsolete status of the original part.

Regulatory Compliance: RoHS3 certification of the substitute part aligns with current environmental and regulatory requirements for electronic component manufacturing and distribution.

Physical & Electrical Compatibility: Identical package dimensions, mounting specifications, and test current parameters ensure direct PCB-level compatibility without layout or assembly modifications.

Luminous Intensity Consideration: The substitute provides 23 times higher luminous intensity (104mcd vs. 4.5mcd). Circuit designs relying on the original part's specific brightness level must evaluate whether this increase affects application performance or requires current-limiting resistor adjustment.

Wavelength Shift: The dominant wavelength shift from 466nm to 470nm remains within the blue LED spectrum and is imperceptible to human vision in indication applications.

Frequently Asked Questions (FAQ)

Q: Can LTST-C190TBKT be used as a direct replacement without PCB modifications?

A: Yes. Both parts share identical package specifications (0603), physical dimensions (1.60mm L x 0.80mm W), maximum height (0.90mm), and mounting type (Surface Mount). No PCB layout changes are required.

Q: What is the impact of the forward voltage difference (3.8V vs. 3.3V)?

A: The substitute operates at 0.5V lower forward voltage. Circuit designs must account for this difference in series resistor calculations to maintain the 20mA test current specification. Existing current-limiting resistor values may require adjustment.

Q: Does the higher luminous intensity (104mcd vs. 4.5mcd) affect compatibility?

A: The substitute provides significantly higher brightness. Applications where the original part's lower intensity was intentional must evaluate whether the increased brightness is acceptable or requires circuit-level current reduction.

Q: Are there packaging format differences?

A: The substitute is available in Cut Tape (CT) and Digi-Reel packaging, whereas the original part packaging format is not specified. Both formats are standard for 0603 components and compatible with automated assembly equipment.

Q: What is the wavelength difference between 466nm and 470nm?

A: Both wavelengths fall within the blue LED spectrum. The 4nm shift is not perceptible to human vision in indication applications and does not affect functional performance in standard LED indication circuits.

Q: Is the substitute RoHS compliant?

A: Yes. The LTST-C190TBKT is RoHS3 compliant, meeting current environmental regulations. The original part's RoHS status is not specified in the provided data.