LTST-S320KEKT Equivalent & Substitute Parts

Part Overview

The LTST-S320KEKT is a red LED indication component manufactured by Lite-On Inc., featuring a 624nm dominant wavelength and 2V forward voltage in a 2-SMD, No Lead surface mount right-angle configuration. This part is classified as obsolete, making identification of compatible substitute components essential for ongoing production and maintenance applications. The component delivers 50mcd luminous intensity at 20mA test current with a 130° viewing angle and clear domed rectangular lens.

Substiute Parts

LTST-S320KEKT

Lite-On Inc.In Stock: 973LTST-S320KEKT Datasheet

Current PartRFQ

LTST-S321KRKT

Lite-On Inc.In Stock: 12709LTST-S321KRKT Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The LTST-S321KRKT qualifies as a parametric equivalent to the LTST-S320KEKT based on the following critical substitution criteria:

Electrical Compatibility:

• Forward voltage (Vf): 2V (identical)
• Test current: 20mA (identical)
• Wavelength range: 631nm dominant / 639nm peak (within red spectrum, comparable to 624nm / 632nm)
• Luminous intensity: 54mcd (within acceptable tolerance of 50mcd)
• Viewing angle: 130° (identical)

Mechanical Compatibility:

• Mounting type: Surface Mount, Right Angle (identical)
• Lens configuration: Rectangle with Domed Top, Clear (identical)
• Lens size: 2.00mm x 1.00mm (identical)
• Physical dimensions: 3.00mm L x 2.00mm W (identical)
• Height: 1.00mm maximum (identical)
• Package type: 2-SMD, No Lead (identical)

Regulatory & Environmental:

• Moisture Sensitivity Level: 3 (168 Hours) (identical)
• REACH Status: REACH Unaffected (identical)
• ECCN: EAR99 (identical)

Parameter Comparison

Engineering Selection Recommendations

The LTST-S321KRKT is the designated substitute for the obsolete LTST-S320KEKT. Selection of this substitute is supported by the following factors:

Product Status: The LTST-S321KRKT maintains active production status with Lite-On Inc., ensuring continued availability and supply chain reliability. The original LTST-S320KEKT is classified as obsolete, necessitating transition to an active equivalent.

Regulatory Compliance: Both components maintain identical REACH and ECCN classifications (REACH Unaffected, EAR99), ensuring no change in regulatory compliance posture or export control requirements.

Electrical & Optical Performance: The substitute maintains identical forward voltage (2V) and test current (20mA) specifications. The wavelength shift from 624nm to 631nm remains within the red LED spectrum with negligible perceptual difference in indication applications. The luminous intensity increase from 50mcd to 54mcd represents a 8% improvement, which is operationally transparent in indication circuits.

Mechanical & Thermal Characteristics: Identical mounting configuration, package dimensions, and moisture sensitivity rating ensure direct PCB-level compatibility without design modification.

Frequently Asked Questions (FAQ)

Q: Can the LTST-S321KRKT be used as a direct replacement for the LTST-S320KEKT without circuit modification?

A: Yes. Both components share identical forward voltage (2V), test current (20mA), mounting type (Surface Mount, Right Angle), package configuration (2-SMD, No Lead), and physical dimensions (3.00mm L x 2.00mm W, 1.00mm height). No circuit redesign is required.

Q: What is the difference in wavelength between these two parts?

A: The LTST-S320KEKT operates at 624nm dominant wavelength (632nm peak), while the LTST-S321KRKT operates at 631nm dominant wavelength (639nm peak). Both wavelengths fall within the red LED spectrum. The 7nm shift in dominant wavelength produces no perceptible difference in red indication applications.

Q: Why is the LTST-S320KEKT classified as obsolete?

A: The LTST-S320KEKT has reached end-of-life status with Lite-On Inc. The LTST-S321KRKT represents the active production equivalent, ensuring continued component availability for new designs and production continuity.

Q: Are there any compliance or certification differences between these parts?

A: No. Both components maintain identical REACH Status (REACH Unaffected) and ECCN classification (EAR99). Moisture Sensitivity Level is identical at MSL 3 (168 Hours). No compliance changes occur with substitution.

Q: What is the packaging difference between these parts?

A: The LTST-S320KEKT is supplied in standard packaging, while the LTST-S321KRKT is supplied in Tape & Reel (TR) format. Both use identical 2-SMD, No Lead package configuration. Tape & Reel packaging is standard for high-volume surface mount assembly operations.

Q: Is the luminous intensity difference between 50mcd and 54mcd significant?

A: The 8% increase in luminous intensity from 50mcd to 54mcd is operationally insignificant in indication applications. Both components deliver equivalent visual performance in standard LED indication circuits.