LTST-S320YKT LED Yellow Clear SMD Right Angle Equivalent & Substitute Parts

Part Overview

The LTST-S320YKT is a yellow 588nm LED indication component manufactured by Lite-On Inc., configured as a 2-SMD surface mount right angle device with a clear domed lens. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The component operates at 2.1V forward voltage with a 4mcd brightness rating and 130° viewing angle, designed for discrete indication applications requiring surface mount assembly.

Key Parameters

Parameter	Value
Manufacturer Part Number	LTST-S320YKT
Manufacturer	Lite-On Inc.
Product Status	Obsolete
Color	Yellow
Wavelength - Dominant	588nm
Voltage - Forward (Vf) (Typ)	2.1V
Current - Test	20mA
Millicandela Rating	4mcd
Viewing Angle	130°
Mounting Type	Surface Mount, Right Angle
Lens Style	Rectangle with Domed Top
Lens Size	2.00mm x 1.00mm
Size / Dimension	3.00mm L x 2.00mm W
Height (Max)	1.00mm
Package / Case	2-SMD, No Lead
Moisture Sensitivity Level (MSL)	3 (168 Hours)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitute parts for the LTST-S320YKT are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Color: Yellow
Wavelength - Dominant: 588nm ± tolerance
Voltage - Forward (Vf): 2.1V
Current - Test: 20mA
Mounting Type: Surface Mount, Right Angle
Lens Style: Rectangle with Domed Top
Lens Size: 2.00mm x 1.00mm
Size / Dimension: 3.00mm L x 2.00mm W
Height (Max): 1.00mm
Package / Case: 2-SMD, No Lead
Viewing Angle: 130° or greater

Acceptable Variation Parameters:

Millicandela Rating: 4mcd to 125mcd (brightness variation acceptable for indication applications)
Product Status: Active preferred over obsolete
Packaging Format: Tape & Reel (TR), Strip, or bulk
Moisture Sensitivity Level: 2A or 3 acceptable

Substitute parts are classified into two categories: parametric equivalents (matching all critical parameters) and manufacturer-recommended alternatives (meeting functional requirements with minor parameter variations).

Parameter Comparison

Parameter	LTST-S320YKT	LTST-S321YKT	5972222602F	5972222607F	APA3010YC	APECVA3010YC	HSMY-C680	HSMY-C110
Manufacturer	Lite-On Inc.	Lite-On Inc.	Dialight	Dialight	Kingbright	Kingbright	Broadcom Limited	Broadcom Limited
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
Color	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow
Wavelength - Dominant	588nm	588nm	589nm	589nm	588nm	588nm	589nm	586nm
Voltage - Forward (Vf) (Typ)	2.1V	2.1V	2.1V	2.1V	2.1V	2.1V	2.1V	2.1V
Current - Test	20mA	20mA	20mA	20mA	20mA	20mA	20mA	20mA
Millicandela Rating	4mcd	4mcd	125mcd	125mcd	7mcd	7mcd	9.3mcd	8mcd
Viewing Angle	130°	130°	130°	130°	120°	120°	125°	130°
Mounting Type	Surface Mount, Right Angle	Surface Mount, Right Angle	Surface Mount, Right Angle	Surface Mount, Right Angle	Surface Mount, Right Angle	Surface Mount, Right Angle	Surface Mount, Right Angle	Surface Mount, Right Angle
Lens Style	Rectangle with Domed Top	Rectangle with Domed Top	Rectangle with Domed Top	Rectangle with Domed Top	Rectangle with Domed Top	Rectangle with Domed Top	Rectangle with Domed Top	Rectangle with Domed Top
Lens Size	2.00mm x 1.00mm	2.00mm x 1.00mm	2.00mm x 1.00mm	2.00mm x 1.00mm	2.00mm x 1.00mm	2.00mm x 1.00mm	2.00mm x 1.00mm	2.60mm x 1.00mm
Size / Dimension	3.00mm L x 2.00mm W	3.00mm L x 2.00mm W	3.00mm L x 2.00mm W	3.00mm L x 2.00mm W	3.00mm L x 2.00mm W	3.00mm L x 2.00mm W	3.00mm L x 1.00mm W	3.20mm L x 1.50mm W
Height (Max)	1.00mm	1.00mm	1.00mm	1.00mm	1.00mm	1.00mm	1.00mm	1.00mm
Package / Case	2-SMD, No Lead	2-SMD, No Lead	2-SMD, No Lead	2-SMD, No Lead	2-SMD, No Lead	2-SMD, No Lead	2-SMD, No Lead	2-SMD, No Lead
Lens Transparency	Clear	Clear	Clear	Clear	Clear	Clear	Clear	Diffused
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	2A (4 Weeks)	2A (4 Weeks)

Engineering Selection Recommendations

Parametric Equivalent - Primary Recommendation: LTST-S321YKT (Lite-On Inc.) is the direct parametric equivalent to LTST-S320YKT. This part maintains identical electrical specifications (2.1V, 20mA, 4mcd, 588nm) and mechanical dimensions while offering active product status and ROHS3 compliance. The only difference is packaging format (Tape & Reel vs. bulk), making this the preferred direct replacement.

Manufacturer-Recommended Alternatives - Yellow LED Options: The Dialight 597 series (5972222602F and 5972222607F) and Kingbright APA3010YC series provide yellow LED indication with matching wavelength (588-589nm), forward voltage (2.1V), and mounting configuration. These parts offer higher brightness ratings (125mcd and 7mcd respectively) and active product status with ROHS3 compliance. Selection between these options depends on packaging requirements (Strip vs. Tape & Reel) and brightness tolerance in the application.

Alternative Brightness Consideration: HSMY-C680 (Broadcom Limited) provides yellow LED indication at 589nm with 2.1V forward voltage and 9.3mcd brightness. This part features improved moisture sensitivity (MSL 2A vs. 3) and maintains the 2-SMD no-lead package. Dimensional variation (3.00mm L x 1.00mm W vs. 3.00mm L x 2.00mm W) requires PCB layout verification.

Diffused Lens Alternative: HSMY-C110 (Broadcom Limited) offers yellow LED indication with diffused lens transparency instead of clear. This part maintains 2.1V forward voltage and 20mA test current with 8mcd brightness and 130° viewing angle. Lens size (2.60mm x 1.00mm) and overall dimensions (3.20mm L x 1.50mm W) differ from the original, requiring mechanical compatibility assessment.

Compliance Status: All recommended substitute parts carry ROHS3 compliance and REACH Unaffected status, matching the regulatory requirements of the original LTST-S320YKT. Product status is active for all substitutes, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can LTST-S321YKT directly replace LTST-S320YKT in production? A: Yes. LTST-S321YKT is a parametric equivalent with identical electrical and optical specifications. The difference is packaging format (Tape & Reel vs. bulk). No circuit or PCB layout changes are required.

Q: What is the brightness difference between LTST-S320YKT (4mcd) and the Dialight alternatives (125mcd)? A: The Dialight 597 series parts deliver significantly higher brightness. If the application requires the original 4mcd specification, use LTST-S321YKT, APA3010YC (7mcd), APECVA3010YC (7mcd), or HSMY-C680 (9.3mcd). The 125mcd Dialight parts are suitable only if the circuit design accommodates higher brightness.

Q: Are there wavelength differences between substitute parts? A: Minor wavelength variations exist. LTST-S320YKT and APA3010YC operate at 588nm (dominant). Dialight 597 series and HSMY-C680 operate at 589nm. HSMY-C110 operates at 586nm. These variations are within the yellow LED spectrum and acceptable for indication applications where precise wavelength matching is not critical.

Q: What is the impact of MSL (Moisture Sensitivity Level) differences? A: LTST-S320YKT, LTST-S321YKT, and Dialight parts specify MSL 3 (168 hours). Broadcom parts (HSML-C680, HSMY-C110) specify MSL 2A (4 weeks), indicating lower moisture sensitivity and reduced baking requirements. MSL 2A parts offer handling advantages in humid environments.

Q: Can HSMY-C110 (diffused lens) replace LTST-S320YKT (clear lens)? A: HSMY-C110 has a diffused lens instead of clear, altering light distribution characteristics. This substitution is acceptable only if the application does not require the specific optical properties of a clear lens. Mechanical dimensions also differ (3.20mm L x 1.50mm W vs. 3.00mm L x 2.00mm W), requiring PCB layout verification.

Q: What packaging options are available for yellow LED substitutes? A: LTST-S321YKT, 5972222607F, APA3010YC, and HSMY-C680 are supplied in Tape & Reel (TR) format. 5972222602F is supplied in Strip format. APECVA3010YC packaging is not specified. Confirm packaging compatibility with assembly equipment before procurement.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All recommended substitute parts carry ROHS3 compliance certification. The original LTST-S320YKT does not specify RoHS status, but all active alternatives meet current regulatory requirements.

Q: What is the viewing angle consideration for substitution? A: LTST-S320YKT specifies 130° viewing angle. LTST-S321YKT, Dialight 597 series, and HSMY-C110 maintain 130°. APA3010YC and APECVA3010YC specify 120°, and HSMY-C680 specifies 125°. Narrower viewing angles concentrate light intensity but reduce peripheral visibility. Confirm application requirements before selecting parts with reduced viewing angles.

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