LTST-S320KYKT Equivalent & Substitute Parts

Part Overview

The LTST-S320KYKT is an amber surface-mount LED indicator manufactured by Lite-On Inc., designed for discrete indication applications with a dominant wavelength of 592nm. This component features a right-angle mounting configuration with a clear, domed rectangular lens and operates at a forward voltage of 2V with a 50mcd brightness rating. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

LTST-S320KYKT

Lite-On Inc.In Stock: 1112LTST-S320KYKT Datasheet

Current PartRFQ

HSMA-C110

Broadcom LimitedIn Stock: 23538HSMA-C110 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LTST-S320KYKT is determined by the following critical parameters:

Color and Wavelength Compatibility: The substitute part must emit amber light at the same dominant wavelength (592nm) and peak wavelength (595nm) to maintain visual consistency and functional equivalence in indication applications.

Electrical Parameters: Forward voltage (Vf) and test current must remain within acceptable operating ranges for the application circuit. The LTST-S320KYKT operates at 2V with a 20mA test current.

Optical Characteristics: Viewing angle (130°) and brightness rating (50mcd) define the visibility envelope. Substitutes must maintain equivalent or superior optical performance.

Mechanical Compatibility: Mounting type (surface mount, right angle), package configuration (2-SMD, No Lead), and physical dimensions determine PCB layout compatibility. Maximum height of 1.00mm is a critical constraint for board-level integration.

Lens Configuration: The rectangular domed lens style with clear transparency is a defining characteristic that influences optical performance and mechanical fit.

The HSMA-C110 from Broadcom Limited qualifies as a substitute based on matching color, wavelength, mounting type, package configuration, viewing angle, and physical height constraints.

Parameter Comparison

Engineering Selection Recommendations

The HSMA-C110 is the qualified substitute for the obsolete LTST-S320KYKT based on the following engineering criteria:

Wavelength and Color Match: Both components emit amber light at 592nm dominant and 595nm peak wavelengths, ensuring visual and functional equivalence in indication circuits.

Electrical Compatibility: The HSMA-C110 operates at 1.9V forward voltage compared to the LTST-S320KYKT's 2V. This 0.1V difference is within acceptable tolerance for most indication applications and results in lower power consumption. Both components are rated for 20mA test current.

Optical Performance: The HSMA-C110 provides 95mcd brightness versus the LTST-S320KYKT's 50mcd, delivering superior visibility while maintaining the same 130° viewing angle. Both feature rectangular domed lens geometry.

Mechanical Fit: Both components share identical mounting type (surface mount, right angle), package configuration (2-SMD, No Lead), and maximum height (1.00mm). The HSMA-C110 has slightly larger overall dimensions (3.20mm L x 1.50mm W versus 3.00mm L x 2.00mm W) and a larger lens size (2.60mm x 1.00mm versus 2.00mm x 1.00mm), which must be verified against PCB layout constraints.

Product Status and Compliance: The HSMA-C110 is an active product with ROHS3 compliance and lower moisture sensitivity (2A, 4 weeks) compared to the obsolete LTST-S320KYKT (MSL 3, 168 hours), providing superior supply chain availability and handling characteristics.

Frequently Asked Questions (FAQ)

Q: Can the HSMA-C110 directly replace the LTST-S320KYKT without circuit modifications?

A: The HSMA-C110 is electrically compatible with the same 20mA test current. The forward voltage difference of 0.1V (1.9V versus 2V) is typically absorbed by series resistor tolerances in indication circuits. However, circuit verification is necessary to confirm the application's voltage headroom and current-limiting design accommodate this parameter variation.

Q: What are the key differences between these two components?

A: The primary differences are: (1) forward voltage is 0.1V lower on the HSMA-C110; (2) brightness is significantly higher at 95mcd versus 50mcd; (3) lens and overall dimensions are slightly larger on the HSMA-C110; (4) the HSMA-C110 has lower moisture sensitivity and is an active product versus obsolete status. All other critical parameters—color, wavelength, viewing angle, mounting type, and package configuration—are identical.

Q: Will the larger lens size of the HSMA-C110 affect PCB layout?

A: The HSMA-C110 lens measures 2.60mm x 1.00mm compared to the LTST-S320KYKT's 2.00mm x 1.00mm, and overall dimensions are 3.20mm L x 1.50mm W versus 3.00mm L x 2.00mm W. PCB layout compatibility must be verified against available board space and component placement constraints. The maximum height remains identical at 1.00mm.

Q: Are there compliance or supply chain advantages to using the HSMA-C110?

A: Yes. The HSMA-C110 is an active product with ROHS3 compliance and significantly higher inventory availability (23,450 pcs in stock versus 1,033 pcs for the obsolete LTST-S320KYKT). The lower moisture sensitivity level (2A versus 3) also reduces handling and storage requirements.

Q: What parameters must remain constant for substitution eligibility?

A: Substitution requires matching color (amber), dominant wavelength (592nm), peak wavelength (595nm), viewing angle (130°), mounting type (surface mount, right angle), package configuration (2-SMD, No Lead), and maximum height (1.00mm). Forward voltage and brightness may vary within acceptable application tolerances.