LTL2H3FX1K Equivalent & Substitute Parts

Part Overview

The LTL2H3FX1K is a red-orange 605nm LED indication component manufactured by Lite-On Inc., configured as a T-1 3/4 through-hole radial package with 4200mcd brightness. This part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements. The component operates at 2V forward voltage with a 20mA test current and features a 15° viewing angle with clear domed lens.

Key Parameters

Parameter	Value
Manufacturer Part Number	LTL2H3FX1K
Manufacturer	Lite-On Inc.
Product Status	Obsolete
Color	Red-Orange
Wavelength - Dominant	605nm
Wavelength - Peak	611nm
Voltage - Forward (Vf) Typical	2V
Current - Test	20mA
Millicandela Rating	4200mcd
Lens Size	5mm, T-1 3/4
Lens Style	Round with Domed Top
Lens Transparency	Clear
Viewing Angle	15°
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	8.60mm
Moisture Sensitivity Level (MSL)	2A (4 Weeks)

Substitute Part Grouping Explanation

Substitution of the LTL2H3FX1K is determined by the following critical parameters:

Primary Compatibility Criteria:

Mounting type: Through hole radial configuration
Lens size: 5mm T-1 3/4 package
Lens style: Round with domed top, clear transparency
Forward voltage: 2V nominal operation
Test current: 20mA
Color family: Red to red-orange spectrum (605nm–639nm dominant wavelength)

Secondary Compatibility Factors:

Millicandela rating: 2780mcd to 18150mcd (brightness variation acceptable based on application requirements)
Viewing angle: 6° to 30° (application-dependent)
Height: 8.60mm to 8.91mm (PCB clearance consideration)
Product status: Active preferred for long-term availability

The substitute parts listed below maintain electrical compatibility within the specified parameters while offering active product status and improved compliance certifications.

Parameter Comparison

Parameter	LTL2H3FX1K	LTL353QRKNN	383-2SDRC/S530-A4	383-2SURC/S530-A6	7343-2USRC/S1060	HLMP-EG08-VY000	HLMP-EG08-WZ000	HLMP-EG08-WZ0DD	HLMP-EG08-X1000	HLMP-EG08-Y2000	HLMP-EG08-YZ000
Manufacturer	Lite-On Inc.	Lite-On Inc.	Everlight Electronics	Everlight Electronics	Everlight Electronics	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
Color	Red-Orange	Red	Red	Red	Red	Red	Red	Red	Red	Red	Red
Wavelength - Dominant (nm)	605	631	639	624	631	626	626	626	626	626	626
Voltage - Forward (Vf) Typical	2V	1.9V	2V	2V	2V	1.9V	1.9V	1.9V	1.9V	1.9V	1.9V
Current - Test	20mA	20mA	20mA	20mA	20mA	20mA	20mA	20mA	20mA	20mA	20mA
Millicandela Rating (mcd)	4200	4200	2780	6300	4000	8100	10750	10750	14100	18150	12650
Lens Size	5mm, T-1 3/4	5mm, T-1 3/4	5.00mm Dia	5mm, T-1 3/4	5mm, T-1 3/4	5mm, T-1 3/4	5mm, T-1 3/4	5mm, T-1 3/4	5mm, T-1 3/4	5mm, T-1 3/4	5mm, T-1 3/4
Lens Style	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top
Lens Transparency	Clear	Clear	Clear	Clear	Clear	Clear	Clear	Clear	Clear	Clear	Clear
Viewing Angle	15°	12°	6°	6°	30°	8°	8°	8°	8°	8°	8°
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Height (Max)	8.60mm	8.80mm	8.90mm	8.90mm	8.85mm	8.91mm	8.91mm	8.91mm	8.91mm	8.91mm	8.91mm
RoHS Status	Not specified	ROHS3 Compliant	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2A (4 Weeks)	1 (Unlimited)	Not specified	Not specified	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Lite-On Inc. Substitute (LTL353QRKNN): This part maintains manufacturer continuity with Lite-On Inc. and offers identical millicandela rating (4200mcd) to the original LTL2H3FX1K. Forward voltage is reduced to 1.9V, requiring circuit verification for current-limiting resistor adjustment. Product status is active with ROHS3 compliance and unlimited MSL rating, supporting long-term availability and environmental compliance requirements.

Everlight Electronics Substitutes (383-2SDRC/S530-A4, 383-2SURC/S530-A6, 7343-2USRC/S1060): Everlight components provide active product status with T-1 3/4 through-hole compatibility. The 383-2SURC/S530-A6 offers the highest brightness (6300mcd) among Everlight options. The 7343-2USRC/S1060 provides the widest viewing angle (30°) and ROHS3 compliance with unlimited MSL. All Everlight parts operate at 2V forward voltage, matching the original specification and eliminating circuit redesign requirements.

Broadcom Limited Substitutes (HLMP-EG08 Series): The HLMP-EG08 series offers the broadest brightness range (8100mcd to 18150mcd) with active product status, ROHS3 compliance, and unlimited MSL rating. All variants operate at 1.9V forward voltage. The HLMP-EG08-WZ000 and HLMP-EG08-WZ0DD provide 10750mcd brightness with bulk and tape & box packaging options respectively. The HLMP-EG08-Y2000 delivers maximum brightness (18150mcd) for applications requiring enhanced visibility. Forward voltage reduction to 1.9V requires circuit verification.

Compliance and Availability: All substitute parts listed are active products with ROHS3 compliance. Broadcom and Lite-On substitutes feature unlimited MSL (1), providing superior moisture handling compared to the original 2A specification. Everlight parts maintain 2V forward voltage compatibility, reducing circuit modification risk.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LTL2H3FX1K with any of these substitutes without circuit modification?

A: Parts maintaining 2V forward voltage (Everlight 383-2SDRC/S530-A4, 383-2SURC/S530-A6, and 7343-2USRC/S1060) require no circuit modification. Parts with 1.9V forward voltage (LTL353QRKNN and all HLMP-EG08 variants) require verification of current-limiting resistor values to maintain 20mA test current operation.

Q: What is the primary difference between the Broadcom HLMP-EG08 variants?

A: All HLMP-EG08 variants share identical electrical specifications (1.9V, 20mA, 626nm dominant wavelength, 8° viewing angle) but differ in millicandela rating and packaging. HLMP-EG08-VY000 provides 8100mcd in bulk packaging. HLMP-EG08-WZ000 and HLMP-EG08-WZ0DD both provide 10750mcd with bulk and tape & box packaging respectively. HLMP-EG08-X1000 provides 14100mcd, HLMP-EG08-Y2000 provides 18150mcd, and HLMP-EG08-YZ000 provides 12650mcd, all in bulk packaging.

Q: How does wavelength difference affect substitution?

A: The original LTL2H3FX1K operates at 605nm dominant wavelength (red-orange). Substitutes operate in the 624nm–639nm range (red spectrum). This wavelength shift produces a perceptibly redder appearance. For applications where color matching is critical, the Everlight 383-2SURC/S530-A6 (624nm) provides the closest wavelength to the original specification.

Q: What is the impact of viewing angle differences?

A: The original part features a 15° viewing angle. Substitutes range from 6° (narrow, directional) to 30° (wide, omnidirectional). Narrow-angle parts (6°–8°) concentrate light intensity and suit applications requiring directional indication. Wide-angle parts (30°) distribute light across a broader area. Application requirements determine optimal viewing angle selection.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification. The original LTL2H3FX1K does not specify RoHS status. Substitution with ROHS3-compliant parts supports environmental and regulatory compliance requirements.

Q: What is the significance of MSL rating differences?

A: The original part specifies MSL 2A (4 weeks), requiring controlled storage and handling. All substitute parts specify MSL 1 (unlimited), eliminating moisture sensitivity constraints and reducing storage and handling complexity. This represents a significant operational advantage for manufacturing and inventory management.

Q: Which substitute offers the closest electrical match to the original?

A: The Everlight 7343-2USRC/S1060 provides the closest overall match: 2V forward voltage (identical), 4000mcd brightness (within 5% of original 4200mcd), T-1 3/4 package, clear domed lens, and through-hole radial mounting. This part requires no circuit modification and maintains visual characteristics similar to the original.

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