LTST-C930CKT Equivalent & Substitute Parts

Part Overview

The LTST-C930CKT is a red 638nm LED indication component manufactured by Lite-On Inc., configured as a discrete 1.8V surface mount chip LED in 1209 (3224 Metric) package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The component features a 320mcd brightness rating with a 25° viewing angle and clear domed lens design suitable for indicator applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	LTST-C930CKT
Manufacturer	Lite-On Inc.
Color	Red
Wavelength - Dominant	638nm
Wavelength - Peak	660nm
Voltage - Forward (Vf) (Typ)	1.8V
Current - Test	20mA
Millicandela Rating	320mcd
Lens Size	1.80mm Dia
Viewing Angle	25°
Package / Case	1209 (3224 Metric)
Size / Dimension	3.20mm L x 2.40mm W
Height (Max)	2.40mm
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the LTST-C930CKT is determined by the following critical parameters:

Primary Compatibility Criteria:

Color: Red
Lens Transparency: Clear
Mounting Type: Surface Mount
Wavelength range: 617nm to 660nm (dominant wavelength)
Voltage - Forward (Vf): 1.8V to 2V
Current - Test: 10mA to 20mA
Lens Style: Round with Domed Top
Lens Size: 1.70mm to 1.80mm Dia
Package compatibility: 1209 (3224 Metric), 1210 (3225 Metric), or 2-SMD, No Lead configurations
Size / Dimension: 3.20mm L x 2.40mm W (standard footprint)
Height (Max): 2.40mm to 2.70mm
RoHS Status: ROHS3 Compliant
MSL: 3 (168 Hours)

Substitute parts must maintain electrical compatibility within the specified voltage and current ranges while preserving the physical form factor for PCB assembly. Wavelength variation within the red spectrum (617nm to 660nm) is acceptable for general indication applications. Package case variations (1209, 1210, 2-SMD) are functionally equivalent provided the footprint dimensions remain within tolerance.

Parameter Comparison

Parameter	LTST-C930CKT	LTST-C930KDKT	42-21SURC/S530-A3/TR8	APD3224EC-F01	QTLP651C2TR	QTLP651C7TR	SML-LXL1209SIC-TR
Manufacturer	Lite-On Inc.	Lite-On Inc.	Everlight Electronics Co Ltd	Kingbright	onsemi	onsemi	Lumex Opto/Components Inc.
Color	Red	Red	Red	Red	Red	Red	Red
Wavelength - Dominant (nm)	638	638	624	617	630	645	-
Wavelength - Peak (nm)	660	650	632	627	635	660	636
Voltage - Forward (Vf) (Typ)	1.8V	2V	2V	2V	2V	1.9V	2V
Current - Test (mA)	20	10	20	20	10	10	20
Millicandela Rating (mcd)	320	247.5	345	60	15	50	600
Lens Size (Dia)	1.80mm	1.80mm	1.80mm	1.70mm	1.10mm	1.10mm	1.80mm
Viewing Angle	25°	25°	20°	20°	20°	20°	30°
Package / Case	1209 (3224 Metric)	2-SMD, No Lead	2-SMD, No Lead	1210 (3225 Metric)	1206 (3016 Metric)	1206 (3016 Metric)	1209 (3224 Metric)
Size / Dimension	3.20mm L x 2.40mm W	3.20mm L x 2.40mm W	3.20mm L x 2.40mm W	3.20mm L x 2.40mm W	3.00mm L x 1.50mm W	3.00mm L x 1.50mm W	3.20mm L x 2.40mm W
Height (Max)	2.40mm	2.50mm	2.70mm	2.40mm	1.50mm	1.50mm	2.70mm
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Obsolete	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Recommended for Active Production):

SML-LXL1209SIC-TR (Lumex Opto/Components Inc.) is the primary recommended substitute. This part maintains identical package dimensions (1209 / 3224 Metric), footprint (3.20mm L x 2.40mm W), and mounting type. Forward voltage (2V) and test current (20mA) are within acceptable operating range. The 600mcd brightness rating exceeds the original specification, providing enhanced visibility margin. Product status is active with full availability. RoHS3 compliance and MSL 3 rating match the original part requirements.

LTST-C930KDKT (Lite-On Inc.) provides manufacturer continuity as a Lite-On product. Identical footprint and package dimensions ensure direct PCB compatibility. Forward voltage increases to 2V with reduced test current (10mA), resulting in lower power consumption. Brightness rating (247.5mcd) is lower than the original but remains suitable for indication applications. Active product status ensures long-term availability.

Tier 2 - Compatible Substitutes (Acceptable with Design Verification):

42-21SURC/S530-A3/TR8 (Everlight Electronics Co Ltd) offers the highest brightness rating (345mcd) among substitutes. Package configuration changes to 2-SMD, No Lead, requiring PCB layout verification for footprint compatibility despite identical dimensions. Forward voltage (2V) and test current (20mA) match the original electrical requirements. Active product status with high inventory (12,200 pcs) ensures procurement reliability.

APD3224EC-F01 (Kingbright) maintains compatible package dimensions and footprint. Package case changes to 1210 (3225 Metric), requiring PCB layout confirmation. Forward voltage (2V) and test current (20mA) are compatible. Brightness rating (60mcd) is significantly lower and suitable only for applications with reduced visibility requirements. Active product status supports ongoing procurement.

Tier 3 - Limited Compatibility (Not Recommended for Direct Substitution):

QTLP651C2TR and QTLP651C7TR (onsemi) feature different package cases (1206 / 3016 Metric) with reduced dimensions (3.00mm L x 1.50mm W). These parts require significant PCB layout redesign and are not suitable for direct footprint replacement. Both parts are obsolete, limiting long-term availability. Brightness ratings (15mcd and 50mcd respectively) are substantially lower than the original specification.

Frequently Asked Questions (FAQ)

Q: Can LTST-C930KDKT be used as a direct replacement for LTST-C930CKT?

A: Yes. Both parts are manufactured by Lite-On Inc. and share identical footprint dimensions (3.20mm L x 2.40mm W) and package type (1209 / 3224 Metric). Forward voltage increases from 1.8V to 2V, and test current decreases from 20mA to 10mA. These electrical differences are within acceptable operating margins for indicator applications. LTST-C930KDKT is active and recommended for new designs.

Q: What is the difference between 1209 and 2-SMD package configurations?

A: Both configurations maintain identical footprint dimensions (3.20mm L x 2.40mm W) and are mechanically compatible with the same PCB layout. The 1209 designation refers to the metric package size (3224 Metric), while 2-SMD, No Lead describes the lead configuration. For direct PCB substitution, both are acceptable provided the assembly process supports the specific lead configuration.

Q: Why does SML-LXL1209SIC-TR have higher brightness (600mcd) than the original part (320mcd)?

A: Brightness variation results from differences in LED die design, lens optical properties, and manufacturing process between manufacturers. The higher brightness rating provides additional visibility margin and is suitable for applications where the original 320mcd specification was conservative. Design verification is recommended if brightness consistency is critical to application performance.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification, matching the original LTST-C930CKT specification. This ensures regulatory compliance for applications subject to RoHS requirements.

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

A: MSL indicates the maximum time a component can be exposed to ambient conditions (typically 30°C / 60% RH) before soldering. MSL 3 (168 Hours) applies to the original part and most substitutes, requiring storage in dry conditions and limiting shelf life after packaging opening. QTLP651C2TR and QTLP651C7TR feature MSL 1 (Unlimited), providing superior moisture tolerance but are not recommended due to obsolete status and package incompatibility.

Q: Can QTLP651C2TR or QTLP651C7TR be used as substitutes?

A: Not recommended. Both parts feature different package cases (1206 / 3016 Metric) with reduced dimensions (3.00mm L x 1.50mm W), requiring complete PCB layout redesign. Both parts are obsolete, limiting long-term procurement viability. Brightness ratings are substantially lower (15mcd and 50mcd), making them unsuitable for applications requiring the original 320mcd specification.

Q: What are the key electrical parameters to verify when selecting a substitute?

A: Forward voltage (Vf), test current, and wavelength are the primary electrical parameters. The original part operates at 1.8V / 20mA with 638nm dominant wavelength. Acceptable substitutes operate within 1.8V to 2V forward voltage range and 10mA to 20mA test current range, with wavelength between 617nm and 660nm. These ranges ensure compatibility with standard indicator circuit designs.

Q: Is brightness (millicandela rating) a critical parameter for substitution?

A: Brightness is application-dependent. If the original 320mcd specification was selected for specific visibility requirements, substitutes with significantly lower ratings (such as QTLP651C2TR at 15mcd) may not meet performance criteria. Conversely, higher brightness substitutes (such as SML-LXL1209SIC-TR at 600mcd) provide additional margin and are generally acceptable. Design verification is recommended if brightness consistency is critical.

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