LTST-S320GKT Green LED Surface Mount Right Angle Equivalent & Substitute Parts

Part Overview

The LTST-S320GKT is a green 569nm LED indication component manufactured by Lite-On Inc., configured as a 2-SMD surface mount right angle package with no lead. 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 10mcd brightness rating and 130° viewing angle, designed for standard indication applications requiring compact form factors.

Key Parameters

Parameter	Value
Manufacturer Part Number	LTST-S320GKT
Manufacturer	Lite-On Inc.
Color	Green
Wavelength - Dominant	569nm
Voltage - Forward (Vf) (Typ)	2.1V
Current - Test	20mA
Millicandela Rating	10mcd
Viewing Angle	130°
Mounting Type	Surface Mount, Right Angle
Lens Style	Rectangle with Domed Top
Lens Size	2.00mm x 1.00mm
Package / Case	2-SMD, No Lead
Size / Dimension	3.00mm L x 2.00mm W
Height (Max)	1.00mm
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution for the LTST-S320GKT is determined by strict alignment of the following critical parameters:

Primary Compatibility Criteria:

Mounting Type: Surface Mount, Right Angle
Package / Case: 2-SMD, No Lead
Physical Dimensions: 3.00mm L x 2.00mm W, 1.00mm Max Height
Lens Size: 2.00mm x 1.00mm
Lens Style: Rectangle with Domed Top
Color: Green
Current - Test: 20mA
Viewing Angle: 130° (±5° tolerance acceptable)

Electrical Compatibility Criteria:

Voltage - Forward (Vf): 2.1V ±0.2V acceptable range
Wavelength - Dominant: 569nm ±10nm acceptable range
Millicandela Rating: 10mcd minimum (higher ratings acceptable for direct replacement)

Substitute parts are grouped into two categories: parametric equivalents with active product status and manufacturer-recommended alternatives offering enhanced specifications or improved availability.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	Wavelength - Dominant	mcd Rating	Viewing Angle	Lens Transparency	Product Status	Packaging
LTST-S320GKT	Lite-On Inc.	2.1V	569nm	10mcd	130°	Clear	Obsolete	Bulk
LTST-S321GKT	LITEON	2.1V	569nm	12mcd	130°	Clear	Active	Tape & Reel (TR)
5972501602F	Dialight	2V	572nm	50mcd	130°	Clear	Active	Strip
5972501607F	Dialight	2V	572nm	50mcd	130°	Clear	Active	Tape & Reel (TR)
5972601602F	Dialight	3.2V	525nm	195mcd	130°	Clear	Active	Strip
5972601607F	Dialight	3.2V	525nm	195mcd	130°	Clear	Active	Tape & Reel (TR)
APA3010MGC	Kingbright	2.1V	570nm	80mcd	120°	Clear	Active	Tape & Reel (TR)
APA3010ZGC	Kingbright	3.3V	525nm	250mcd	120°	Clear	Active	Tape & Reel (TR)
HSMG-C110	Broadcom Limited	2.2V	572nm	15mcd	130°	Diffused	Active	Cut Tape (CT) & Digi-Reel®
HSMG-C680	Broadcom Limited	2.2V	573nm	13.3mcd	125°	Clear	Active	Cut Tape (CT) & Digi-Reel®
SML-LXR851GC-TR	Lumex Opto/Components Inc.	2.2V	565nm	11mcd	160°	Clear	Active	Surface Mount, Right Angle

Engineering Selection Recommendations

Direct Parametric Equivalent (Highest Compatibility):

LTST-S321GKT from LITEON is the primary substitute. This part maintains identical electrical specifications (2.1V, 569nm dominant wavelength), matching physical dimensions, and equivalent optical performance (12mcd vs. 10mcd). The part carries active product status with ROHS3 compliance and identical MSL rating. Tape & Reel packaging provides improved handling for production environments compared to the obsolete bulk packaging of the original part.

Secondary Equivalents (Acceptable with Circuit Verification):

HSMG-C680 from Broadcom Limited and SML-LXR851GC-TR from Lumex Opto/Components Inc. provide close electrical alignment (2.2V forward voltage, 573nm and 565nm dominant wavelengths respectively) within acceptable tolerance ranges. Both maintain 130° or greater viewing angles and equivalent physical form factors. These parts are suitable where the original part specifications allow minor wavelength and brightness variations.

Higher Performance Alternatives (Requires Circuit Re-evaluation):

The Dialight 597 series (5972501602F, 5972501607F, 5972601602F, 5972601607F) and Kingbright APA3010MGC offer significantly enhanced brightness ratings (50mcd to 195mcd). These parts require circuit-level verification to confirm that increased luminous intensity does not exceed application requirements. The 597 series variants operate at either 2V or 3.2V forward voltage, necessitating power supply compatibility assessment.

Wavelength-Specific Selection:

For applications requiring strict 569nm wavelength adherence, LTST-S321GKT and APA3010MGC provide the closest spectral match. For applications tolerant of green spectrum variation (565nm to 573nm), all listed substitutes maintain acceptable color rendering within standard green LED indication ranges.

Compliance and Availability:

All recommended substitutes carry active product status and ROHS3 compliance certification. Inventory availability ranges from 662 to 71,248 units across suppliers, ensuring procurement continuity. MSL ratings of 2A to 3 accommodate standard storage and handling protocols.

Frequently Asked Questions (FAQ)

Q: Can LTST-S321GKT directly replace LTST-S320GKT without circuit modification?

A: Yes. LTST-S321GKT maintains identical forward voltage (2.1V), dominant wavelength (569nm), and physical dimensions. The 2mcd brightness increase (12mcd vs. 10mcd) is within typical application tolerance for indication LEDs. No circuit modification is required.

Q: What is the primary difference between Dialight 597 series parts (5972501 vs. 5972601)?

A: The 5972501 series operates at 2V forward voltage with 50mcd brightness and 572nm wavelength. The 5972601 series operates at 3.2V forward voltage with 195mcd brightness and 525nm wavelength. Selection depends on available power supply voltage and required brightness level. Both maintain 130° viewing angle and identical physical form factor.

Q: Are Kingbright APA3010 parts suitable substitutes despite lower viewing angle (120° vs. 130°)?

A: APA3010MGC is suitable where the 120° viewing angle meets application requirements. APA3010ZGC operates at 3.3V and 525nm wavelength, requiring circuit verification for voltage compatibility and wavelength acceptance. Both parts maintain identical physical dimensions and 2-SMD package configuration.

Q: What is the difference between Broadcom HSMG-C110 and HSMG-C680?

A: HSMG-C110 features diffused lens transparency with 15mcd brightness, while HSMG-C680 features clear lens transparency with 13.3mcd brightness. Both operate at 2.2V and maintain 130° or greater viewing angles. Selection depends on whether diffused or clear lens appearance is required for the application.

Q: Can higher brightness alternatives (50mcd to 250mcd) be used as direct drop-in replacements?

A: Higher brightness parts require circuit-level verification. Increased luminous intensity may exceed application requirements for indication purposes, potentially causing excessive power consumption or visual glare. Confirm that the application circuit can accommodate the higher brightness rating before substitution.

Q: What packaging format should be selected for production environments?

A: Tape & Reel (TR) packaging is recommended for automated assembly processes. Cut Tape (CT) & Digi-Reel® packaging suits lower-volume or manual assembly operations. Strip packaging is suitable for component-level procurement where reel handling is not required.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All active product status parts listed carry ROHS3 compliance certification. The original LTST-S320GKT does not specify RoHS status due to obsolete classification, but all recommended substitutes meet current environmental compliance requirements.

Q: What is the significance of MSL (Moisture Sensitivity Level) differences between parts?

A: HSMG-C110 and HSMG-C680 carry MSL 2A (4 weeks), while all other parts carry MSL 3 (168 hours). MSL 2A requires more stringent moisture control during storage and handling. For standard warehouse conditions, MSL 3 parts are acceptable. MSL 2A parts require desiccant packaging and controlled humidity environments.

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