LTST-C170CKT Equivalent & Substitute Parts

Part Overview

The LTST-C170CKT is a red LED indication component manufactured by Lite-On Inc., configured as a discrete 0805 (2012 Metric) surface mount device. This part operates at 1.8V forward voltage with a 10mA test current and features a clear lens with a 638nm dominant wavelength. The component is classified as obsolete, making substitute parts necessary for ongoing production and design updates.

Key Parameters

Parameter	Value
Manufacturer Part Number	LTST-C170CKT
Manufacturer	Lite-On Inc.
Package / Case	0805 (2012 Metric)
Color	Red
Lens Transparency	Clear
Voltage - Forward (Vf) (Typ)	1.8V
Current - Test	10mA
Millicandela Rating	10mcd
Wavelength - Dominant	638nm
Wavelength - Peak	660nm
Viewing Angle	130°
Mounting Type	Surface Mount
Size / Dimension	2.00mm L x 1.25mm W
Height (Max)	1.10mm
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the LTST-C170CKT are selected based on strict alignment with the following critical parameters:

Package / Case: 0805 (2012 Metric) surface mount configuration
Color: Red LED indication
Mounting Type: Surface Mount
Size / Dimension: 2.00mm L x 1.25mm W
Voltage - Forward (Vf) (Typ): 1.8V nominal operation
Wavelength compatibility: Red spectrum (620nm–660nm range)
RoHS Status: ROHS3 Compliant
Regulatory compliance: REACH Unaffected, ECCN EAR99

Substitute parts must maintain mechanical compatibility (0805 package footprint and dimensions) and electrical compatibility (forward voltage within acceptable operating range and red wavelength specification). Variations in millicandela rating, viewing angle, and lens transparency are permitted when the core functional parameters align.

Parameter Comparison

Parameter	LTST-C170CKT	LTST-C170KDKT	BR1112H-TR	HSMH-C170	SML-211UTT86	SML-LX0805IC-TR	SML-LX0805SIC-TR	SML-LX0805SRC-TR
Manufacturer	Lite-On Inc.	Lite-On Inc.	Stanley Electric Co	Broadcom Limited	Rohm Semiconductor	Lumex Opto/Components Inc.	Lumex Opto/Components Inc.	Lumex Opto/Components Inc.
Package / Case	0805 (2012 Metric)	0805 (2012 Metric)	0805 (2012 Metric)	0805 (2012 Metric)	0805 (2012 Metric)	0805 (2012 Metric)	0805 (2012 Metric)	0805 (2012 Metric)
Color	Red	—	Red	Red	Red	Red	Red	Red
Lens Transparency	Clear	—	Diffused	Diffused	Clear	Clear	Clear	Clear
Voltage - Forward (Vf) (Typ)	1.8V	—	1.7V	1.8V	1.8V	2V	2V	1.7V
Current - Test	10mA	—	20mA	20mA	2mA	20mA	20mA	20mA
Millicandela Rating	10mcd	—	11.7mcd	17mcd	2.5mcd	9mcd	60mcd	25mcd
Wavelength - Dominant	638nm	—	647nm	639nm	620nm	—	—	—
Wavelength - Peak	660nm	—	660nm	660nm	—	635nm	636nm	660nm
Viewing Angle	130°	—	150°	170°	—	140°	140°	140°
Size / Dimension	2.00mm L x 1.25mm W	—	2.00mm L x 1.25mm W	2.00mm L x 1.25mm W	2.00mm L x 1.25mm W	2.00mm L x 1.25mm W	2.00mm L x 1.25mm W	2.00mm L x 1.25mm W
Height (Max)	1.10mm	—	0.90mm	0.80mm	0.90mm	1.20mm	1.20mm	1.20mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Obsolete	Obsolete	Not For New Designs	Active	Active	Active
Packaging	—	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

LTST-C170KDKT (Lite-On Inc.) is the direct manufacturer recommendation, maintaining the same base product number (LTST-C170) with active product status and ROHS3 compliance. This part is preferred for new designs requiring continuity with the original specification.

SML-LX0805IC-TR and SML-LX0805SIC-TR (Lumex Opto/Components Inc.) are active products with full ROHS3 compliance. Both maintain 0805 package compatibility and clear lens configuration. SML-LX0805SIC-TR provides higher millicandela output (60mcd) compared to the original 10mcd, suitable for applications requiring increased brightness. SML-LX0805IC-TR offers 9mcd output, closer to the original specification.

SML-LX0805SRC-TR (Lumex Opto/Components Inc.) is an active product with 1.7V forward voltage and 25mcd output, providing a mid-range brightness option with peak wavelength at 660nm, matching the original specification.

Secondary Substitutes (Obsolete or Limited Status):

BR1112H-TR (Stanley Electric Co) and HSMH-C170 (Broadcom Limited) are obsolete products suitable only for replacement or repair of existing assemblies. Both maintain 0805 package compatibility and ROHS3 compliance but are not recommended for new designs.

SML-211UTT86 (Rohm Semiconductor) carries "Not For New Designs" status and is suitable only for legacy system maintenance.

Compliance Verification:

All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 ECCN classification, matching the regulatory profile of the original LTST-C170CKT.

Frequently Asked Questions (FAQ)

Q: Can I use SML-LX0805SIC-TR as a direct replacement for LTST-C170CKT?

A: Yes, with circuit design consideration. Both parts share the 0805 package footprint, 2.00mm L x 1.25mm W dimensions, clear lens configuration, and ROHS3 compliance. The primary difference is forward voltage (2V vs. 1.8V) and millicandela rating (60mcd vs. 10mcd). Circuit current-limiting resistor values must be recalculated for the 2V forward voltage to maintain proper LED operation.

Q: What is the difference between clear and diffused lens options?

A: Clear lens parts (LTST-C170CKT, SML-211UTT86, SML-LX0805IC-TR, SML-LX0805SIC-TR, SML-LX0805SRC-TR) provide focused light output with defined viewing angles. Diffused lens parts (BR1112H-TR, HSMH-C170) scatter light over a wider area, reducing peak brightness but improving visibility from off-axis angles. Selection depends on application requirements for light distribution and viewing angle.

Q: Why do some substitute parts show incomplete parameter data?

A: LTST-C170KDKT shows incomplete electrical parameters because it is listed as a chip-level component without full lens and optical specifications. This part maintains mechanical and package compatibility but requires verification of optical characteristics for specific applications.

Q: Are all substitute parts available in the same packaging format?

A: No. LTST-C170KDKT, SML-LX0805IC-TR, SML-LX0805SIC-TR, and SML-LX0805SRC-TR are supplied in Tape & Reel (TR) format. BR1112H-TR, HSMH-C170, and SML-211UTT86 are supplied in Cut Tape (CT) & Digi-Reel® format. Packaging selection affects procurement and assembly processes.

Q: Which substitute is recommended for new product designs?

A: SML-LX0805IC-TR or SML-LX0805SIC-TR (Lumex Opto/Components Inc.) are recommended for new designs. Both carry active product status, full ROHS3 compliance, and proven availability. SML-LX0805IC-TR provides output closest to the original 10mcd specification, while SML-LX0805SIC-TR offers higher brightness (60mcd) for applications requiring increased visibility.

Q: How do forward voltage differences affect circuit design?

A: Forward voltage variations (1.7V to 2V across substitutes) directly impact current-limiting resistor calculations. A circuit designed for 1.8V operation with a specific resistor value will deliver different current through a 2V LED, affecting brightness and component lifespan. Resistor values must be recalculated using Ohm's Law: R = (Supply Voltage − Vf) / Desired Current.

Q: Can I substitute a diffused lens part for a clear lens part?

A: Mechanically yes, but optically no. Diffused lens parts (BR1112H-TR, HSMH-C170) scatter light differently than clear lens parts, resulting in lower peak brightness and altered viewing angle characteristics. Application requirements for light distribution must be verified before substitution.

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