LTL-4268-H3 Equivalent & Substitute Parts

Part Overview

The LTL-4268-H3 is a red LED indicator manufactured by Lite-On Inc., designed for through-hole mounting in T-1 3/4 package format. This part operates at 1.8V forward voltage with a 220mcd brightness rating and 638nm dominant wavelength. The product is currently obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Substitute parts must maintain compatibility with the original electrical specifications, mechanical form factor, and mounting requirements while accounting for minor variations in optical and electrical performance.

Key Parameters

Parameter	LTL-4268-H3
Manufacturer	Lite-On Inc.
Color	Red
Lens Transparency	Clear
Lens Size	5.00mm Dia
Voltage - Forward (Vf) (Typ)	1.8V
Current - Test	20mA
Millicandela Rating	220mcd
Wavelength - Dominant	638nm
Wavelength - Peak	660nm
Viewing Angle	16°
Mounting Type	Through Hole
Package / Case	Radial
Supplier Device Package	T-1 3/4
Height (Max)	8.60mm
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the LTL-4268-H3 is determined by the following critical parameters:

Mechanical Compatibility: Package type (T-1 3/4 Radial), lens size (5.00mm diameter), mounting type (through-hole), and physical height must remain within acceptable tolerances for PCB assembly and enclosure fit.

Electrical Compatibility: Forward voltage (Vf) range, test current (20mA), and wavelength characteristics (dominant and peak wavelengths in the red spectrum) determine circuit integration feasibility. Substitute parts with Vf between 1.7V and 2.2V are electrically compatible with standard LED indicator circuits designed for the original part.

Optical Performance: Millicandela rating and viewing angle define brightness and visibility characteristics. Substitutes may vary in brightness and viewing angle while maintaining the red color and clear lens transparency.

Compliance & Status: RoHS3 compliance and active product status are preferred for new designs and long-term availability, though obsolete parts remain functionally equivalent if compliance requirements are met.

The six substitute parts listed below meet these criteria with documented electrical and mechanical compatibility to the LTL-4268-H3.

Parameter Comparison

Parameter	LTL-4268-H3	LTL2R3KDKNN	333-2SURC/S530-A2	LR530	MV3750	MV8102	MV8141	SSL-LX5093SRC/F
Manufacturer	Lite-On Inc.	Lite-On Inc.	Everlight Electronics Co Ltd	Seoul Semiconductor Inc.	onsemi	onsemi	Fairchild Semiconductor	Lumex Opto/Components Inc.
Color	Red	Red	Red	Red	Red	Red	Red	Red
Lens Transparency	Clear	Clear	Clear	Clear	Clear	Clear	Clear	Clear
Lens Size	5.00mm Dia	5mm, T-1 3/4	5.00mm Dia	5.00mm Dia	5mm, T-1 3/4	5mm, T-1 3/4	5mm, T-1 3/4	5mm, T-1 3/4
Voltage - Forward (Vf) (Typ)	1.8V	2V	2V	2.2V	2.2V	1.7V	1.7V	1.7V
Current - Test	20mA	20mA	20mA	20mA	20mA	20mA	20mA	20mA
Millicandela Rating	220mcd	360mcd	837mcd	6500mcd	150mcd	370mcd	370mcd	1200mcd
Wavelength - Dominant	638nm	639nm	632nm	625nm	—	—	—	—
Wavelength - Peak	660nm	650nm	639nm	—	635nm	660nm	660nm	660nm
Viewing Angle	16°	30°	10°	30°	24°	20°	40°	30°
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial
Supplier Device Package	T-1 3/4	T-1 3/4	5mm Round	—	T-1 3/4	T-1 3/4	T-1 3/4	T-1 3/4
Height (Max)	8.60mm	9.95mm	8.90mm	9.90mm	8.89mm	8.90mm	—	8.60mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—	ROHS3 Compliant	—	—	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Obsolete	Obsolete	Active	Active

Engineering Selection Recommendations

For Active Product Status with RoHS3 Compliance:

LTL2R3KDKNN (Lite-On Inc.) and SSL-LX5093SRC/F (Lumex Opto/Components Inc.) are the preferred substitutes. Both are active products with ROHS3 compliance. LTL2R3KDKNN maintains manufacturer continuity from the original Lite-On part. SSL-LX5093SRC/F offers higher brightness (1200mcd) and identical physical height (8.60mm) to the original part, with active product status and full RoHS3 compliance.

For Electrical Compatibility with Lower Forward Voltage:

MV8141 (Fairchild Semiconductor) and MV8102 (onsemi) both operate at 1.7V forward voltage, closest to the original 1.8V specification. MV8141 is active with RoHS3 compliance and offers the widest viewing angle (40°). MV8102 is obsolete but remains available with 370mcd brightness.

For High Brightness Applications:

LR530 (Seoul Semiconductor Inc.) provides 6500mcd brightness with active product status and RoHS3 compliance, suitable for applications requiring enhanced visibility. Forward voltage is 2.2V, requiring circuit evaluation for compatibility.

For Brightness Reduction:

MV3750 (onsemi) offers the lowest brightness (150mcd) at 2.2V forward voltage, suitable for applications where the original 220mcd exceeds requirements. This part is obsolete.

For Narrow Viewing Angle:

333-2SURC/S530-A2 (Everlight Electronics Co Ltd) provides a 10° viewing angle, the narrowest among substitutes, with 837mcd brightness and 2V forward voltage. This part is active but RoHS status is not specified.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different forward voltage than the LTL-4268-H3?

A: Yes, within limits. The LTL-4268-H3 operates at 1.8V. Substitutes ranging from 1.7V to 2.2V are electrically compatible with standard LED indicator circuits. However, circuit current-limiting resistor values may require adjustment to maintain 20mA test current. Consult your circuit design specifications before substitution.

Q: What is the impact of different millicandela ratings on substitution?

A: Millicandela rating determines brightness. Substitutes range from 150mcd to 6500mcd compared to the original 220mcd. Higher brightness may cause visual glare or excessive power consumption; lower brightness may reduce visibility. Select based on your application's visibility requirements and power budget.

Q: Are all substitute parts mechanically compatible with the original PCB footprint?

A: All substitutes use T-1 3/4 radial package format with 5mm lens diameter and through-hole mounting. Physical heights range from 8.60mm to 9.95mm. Verify that your PCB enclosure and assembly equipment accommodate the maximum height of your selected substitute. The original part height is 8.60mm; substitutes with heights up to 8.90mm are generally compatible with standard enclosures.

Q: Which substitute offers the best long-term availability?

A: SSL-LX5093SRC/F (Lumex Opto/Components Inc.) and LTL2R3KDKNN (Lite-On Inc.) are both active products with confirmed inventory levels exceeding 1000 units. Both carry RoHS3 compliance and are suitable for new designs requiring long-term supply assurance.

Q: Can I substitute the LTL-4268-H3 with a part having a different viewing angle?

A: Yes. The original part has a 16° viewing angle. Substitutes range from 10° to 40°. Narrower angles concentrate light intensity in a specific direction; wider angles distribute light across a broader area. Select based on your application's visibility requirements and mounting orientation.

Q: What compliance certifications should I verify before substitution?

A: RoHS3 compliance is specified for the original part. Verify that your selected substitute meets the same RoHS3 requirement if your application or market requires it. SSL-LX5093SRC/F, LTL2R3KDKNN, LR530, and MV8141 all carry ROHS3 compliance certification.

Q: Is wavelength compatibility critical for substitution?

A: Red LEDs in this category span 625nm to 660nm wavelength ranges. All substitutes maintain red color perception within human vision. If your application uses wavelength-specific optical filtering or color-matching requirements, compare dominant and peak wavelengths carefully. The original part's 638nm dominant wavelength is closely matched by LTL2R3KDKNN (639nm) and 333-2SURC/S530-A2 (632nm).

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