LTST-C150CKT Equivalent & Substitute Parts

Part Overview

The LTST-C150CKT is a red LED indicator in 1206 SMD package manufactured by Lite-On Inc. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The 1206 (3216 Metric) form factor with surface mount configuration remains widely supported across multiple manufacturers, enabling direct functional replacement with active alternatives.

Key Parameters

Parameter	Value
Manufacturer Part Number	LTST-C150CKT
Manufacturer	Lite-On Inc.
Product Status	Obsolete
Color	Red
Package / Case	1206 (3216 Metric)
Mounting Type	Surface Mount
Voltage - Forward (Vf) (Typ)	1.8V
Current - Test	20mA
Wavelength - Dominant	638nm
Wavelength - Peak	660nm
Millicandela Rating	10mcd
Viewing Angle	130°
Lens Style	Rectangle with Flat Top
Size / Dimension	3.20mm L x 1.60mm W
Height (Max)	1.10mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the LTST-C150CKT is determined by the following critical parameters:

Primary Compatibility Criteria:

Package / Case: 1206 (3216 Metric)
Mounting Type: Surface Mount
Color: Red
Wavelength range: 638nm to 660nm dominant wavelength
Forward voltage: 1.8V nominal (acceptable range 1.7V to 2.1V for standard applications)
Test current: 20mA
RoHS3 compliance

Secondary Consideration Parameters:

Millicandela rating (brightness): 10mcd baseline; higher ratings acceptable for indication applications
Viewing angle: 130° baseline; wider angles (140°) acceptable
Lens style and size: Rectangle with flat top preferred; minor dimensional variations acceptable within 1206 package constraints
MSL rating: Level 3 or 4 acceptable for standard PCB assembly processes

Substitute parts must maintain electrical compatibility (forward voltage and test current) and physical compatibility (1206 package, surface mount) while meeting RoHS3 compliance. Brightness and viewing angle variations are acceptable as they do not affect circuit functionality in indication applications.

Parameter Comparison

Parameter	LTST-C150CKT	LTST-C150KDKT-10A	SM1206HC	SM1206RC	SM1206SRC	SM1206URC	SM1206URC-IL	SML-LX1206IC-TR	SML-LX1206SRC-TR
Manufacturer	Lite-On Inc.	Lite-On Inc.	Bivar Inc.	Bivar Inc.	Bivar Inc.	Bivar Inc.	Bivar Inc.	Lumex Opto/Components Inc.	Lumex Opto/Components Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
Color	Red	—	Red	Red	Red	Red	Red	Red	Red
Package / Case	1206 (3216 Metric)	—	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)
Mounting Type	Surface Mount	—	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Voltage - Forward (Vf) (Typ)	1.8V	—	1.8V	2V	1.85V	2.1V	2.1V	2V	1.7V
Current - Test	20mA	—	20mA	20mA	20mA	20mA	20mA	20mA	20mA
Wavelength - Dominant	638nm	—	643nm	645nm	640nm	640nm	640nm	—	—
Wavelength - Peak	660nm	—	660nm	700nm	660nm	655nm	655nm	640nm	660nm
Millicandela Rating	10mcd	—	15mcd	0.9mcd	28mcd	55mcd	220mcd	9mcd	25mcd
Viewing Angle	130°	—	140°	140°	140°	140°	30°	130°	140°
Lens Style	Rectangle with Flat Top	—	Rectangle with Flat Top	Rectangle with Flat Top	Rectangle with Flat Top	Rectangle with Flat Top	Round with Flat Top	Rectangle with Flat Top	Rectangle with Flat Top
Size / Dimension	3.20mm L x 1.60mm W	—	3.20mm L x 1.60mm W	3.20mm L x 1.60mm W	3.20mm L x 1.60mm W	3.20mm L x 1.60mm W	3.20mm L x 1.60mm W	3.20mm L x 1.50mm W	3.20mm L x 1.60mm W
Height (Max)	1.10mm	—	1.10mm	1.10mm	1.10mm	1.10mm	1.40mm	1.10mm	1.10mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	4 (72 Hours)	4 (72 Hours)	4 (72 Hours)	4 (72 Hours)	4 (72 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

Primary Substitute (Manufacturer Recommended): LTST-C150KDKT-10A from Lite-On Inc. is the manufacturer-recommended substitute. As an active product from the original manufacturer, this part maintains design continuity and supply chain consistency. However, limited technical specifications are provided for this variant.

Bivar Inc. Series (SM1206 Family): The SM1206HC, SM1206RC, SM1206SRC, SM1206URC, and SM1206URC-IL represent active alternatives from Bivar Inc. All maintain 1206 package compatibility, surface mount configuration, and RoHS3 compliance. Forward voltage ranges from 1.8V to 2.1V, accommodating standard circuit designs. Brightness varies from 0.9mcd to 220mcd depending on application requirements. The SM1206URC-IL features a narrower 30° viewing angle and round lens style, suitable for focused indication applications.

Lumex Opto/Components Inc. Series (SML-LX1206 Family): The SML-LX1206IC-TR and SML-LX1206SRC-TR provide alternatives with MSL Level 3 rating (168 Hours), matching the original part's moisture sensitivity specification. Both maintain 1206 package compatibility and surface mount configuration. The SML-LX1206SRC-TR offers 1.7V forward voltage and 25mcd brightness with 140° viewing angle. The SML-LX1206IC-TR provides 2V forward voltage and 9mcd brightness with 130° viewing angle.

Selection Criteria:

For direct electrical replacement with minimal circuit redesign: SM1206HC or SML-LX1206SRC-TR
For MSL Level 3 requirement: SML-LX1206IC-TR or SML-LX1206SRC-TR
For higher brightness applications: SM1206URC (55mcd) or SM1206URC-IL (220mcd)
For lower brightness applications: SM1206RC (0.9mcd)

All substitute parts are RoHS3 compliant and suitable for standard PCB assembly processes.

Frequently Asked Questions (FAQ)

Q: Can SM1206URC-IL replace LTST-C150CKT directly? A: SM1206URC-IL maintains 1206 package, surface mount, and RoHS3 compliance. However, it features a 30° viewing angle versus the original 130°, and a round lens style versus rectangle. Height is 1.40mm maximum versus 1.10mm. These differences are acceptable only if the application tolerates narrower viewing angle and increased height.

Q: What is the difference between SM1206SRC and SM1206URC? A: Both are Bivar Inc. 1206 red LEDs with 640nm dominant wavelength and 20mA test current. SM1206SRC operates at 1.85V with 28mcd brightness and 140° viewing angle. SM1206URC operates at 2.1V with 55mcd brightness and 140° viewing angle. Selection depends on circuit voltage tolerance and required brightness.

Q: Are Lumex SML-LX1206 parts compatible with Bivar SM1206 parts? A: Yes. Both series maintain 1206 package, surface mount configuration, red color, and RoHS3 compliance. Electrical parameters (forward voltage 1.7V to 2V, test current 20mA) are compatible with standard indicator circuits. Physical dimensions are equivalent within package tolerance.

Q: Why does SM1206RC have lower brightness (0.9mcd) than other options? A: SM1206RC is specified for applications requiring lower brightness indication. Its 2V forward voltage and 0.9mcd rating make it suitable for designs where standard brightness levels would be excessive.

Q: What is the significance of MSL Level 3 versus Level 4? A: MSL Level 3 allows 168 hours of moisture exposure before reflow, while MSL Level 4 allows 72 hours. For standard PCB assembly processes with typical lead times, both levels are acceptable. MSL Level 3 (LTST-C150CKT, SML-LX1206IC-TR, SML-LX1206SRC-TR) provides extended handling time if required.

Q: Can these parts be used interchangeably in existing designs? A: All substitute parts maintain 1206 package and surface mount configuration, enabling direct PCB footprint compatibility. Circuit compatibility depends on forward voltage tolerance and brightness requirements. Designs operating at 1.8V nominal should verify compatibility with parts rated 2V or 2.1V. Brightness variations (0.9mcd to 220mcd) are acceptable for indication applications unless specific luminous intensity is required.

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