LTL-4208 Equivalent & Substitute Parts

Part Overview

The LTL-4208 is a red LED indicator manufactured by Lite-On Inc., featuring a 5mm T-1 3/4 through-hole package with a clear lens. This part operates at 1.7V forward voltage with a 12.6mcd brightness rating and 651nm dominant wavelength. The LTL-4208 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	LTL-4208 Value
Manufacturer	Lite-On Inc.
Color	Red
Lens Size	5mm, T-1 3/4
Lens Transparency	Clear
Voltage - Forward (Vf) (Typ)	1.7V
Current - Test	10mA
Millicandela Rating	12.6mcd
Wavelength - Dominant	651nm
Wavelength - Peak	655nm
Mounting Type	Through Hole
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the LTL-4208 is determined by the following critical parameters:

Lens size: 5mm, T-1 3/4 form factor
Mounting type: Through hole radial configuration
Color: Red
Lens transparency: Clear
Forward voltage range: 1.7V to 2.2V
Millicandela rating: 10mcd to 370mcd
Wavelength range: 635nm to 660nm peak

Substitute parts are grouped into two categories based on electrical characteristics:

Group 1 (Low Forward Voltage - 1.7V to 1.8V): HLMP-D105, HLMP-D105-M0002, HLMP-D155, HLMP-D155-F0002, MV8102. These parts maintain forward voltage compatibility with the original LTL-4208 specification.

Group 2 (Higher Forward Voltage - 2.2V): MV3750, MV37509MP6, MV3750A3R0, MV3750B4R0, MV3750P. These parts operate at elevated forward voltage and are suitable for applications with different circuit design requirements.

Parameter Comparison

Part Number	Manufacturer	Color	Lens Size	Vf (Typ)	Current - Test	mcd Rating	Wavelength - Peak	Viewing Angle	Product Status	Packaging
LTL-4208	Lite-On Inc.	Red	5mm, T-1 3/4	1.7V	10mA	12.6mcd	655nm	16°	Obsolete	-
HLMP-D105	Broadcom Limited	Red	5mm, T-1 3/4	1.8V	20mA	240mcd	645nm	24°	Active	Bulk
HLMP-D105-M0002	Broadcom Limited	Red	5mm, T-1 3/4	1.8V	20mA	240mcd	645nm	24°	Active	Tape & Reel (TR)
HLMP-D155	Broadcom Limited	Red	5mm, T-1 3/4	1.7V	1mA	10mcd	660nm	24°	Active	Bulk
HLMP-D155-F0002	Broadcom Limited	Red	5mm, T-1 3/4	1.7V	1mA	10mcd	660nm	24°	Active	Tape & Reel (TR)
MV3750	onsemi	Red	5mm, T-1 3/4	2.2V	20mA	150mcd	635nm	24°	Obsolete	-
MV37509MP6	onsemi	Red	5mm, T-1 3/4	2.2V	20mA	150mcd	635nm	-	Obsolete	-
MV3750A3R0	Everlight Electronics Co Ltd	Red	5mm, T-1 3/4	2.2V	20mA	150mcd	635nm	24°	Active	-
MV3750B4R0	Fairchild Semiconductor	Red	5mm, T-1 3/4	2.2V	20mA	150mcd	635nm	24°	Active	Bulk
MV3750P	Everlight Electronics Co Ltd	Red	5mm, T-1 3/4	2.2V	20mA	150mcd	635nm	24°	Active	-
MV8102	onsemi	Red	5mm, T-1 3/4	1.7V	20mA	370mcd	660nm	20°	Obsolete	-

Engineering Selection Recommendations

For Active Product Status Requirement:

HLMP-D105 and HLMP-D105-M0002 (Broadcom Limited) are active products with ROHS3 compliance and REACH unaffected status. These parts operate at 1.8V forward voltage, within 0.1V of the LTL-4208 specification, and provide 240mcd brightness. HLMP-D105-M0002 is available in Tape & Reel packaging for automated assembly.

HLMP-D155 and HLMP-D155-F0002 (Broadcom Limited) are active products with identical 1.7V forward voltage to the LTL-4208. These parts operate at 1mA test current with 10mcd brightness, matching the original brightness specification. ROHS3 compliance and REACH unaffected status are confirmed.

MV3750A3R0 and MV3750P (Everlight Electronics Co Ltd) are active products with ROHS3 compliance. These parts operate at 2.2V forward voltage with 150mcd brightness and are suitable for applications with higher voltage tolerance.

MV3750B4R0 (Fairchild Semiconductor) is an active product available in bulk packaging. Forward voltage is 2.2V with 150mcd brightness. RoHS status is not applicable; REACH status is vendor undefined.

For Obsolete Product Replacement:

When replacing the obsolete LTL-4208 in new designs, HLMP-D155 or HLMP-D155-F0002 provide the closest electrical match with active product status and full compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can HLMP-D105 directly replace LTL-4208 in existing circuits?

A: HLMP-D105 operates at 1.8V forward voltage compared to LTL-4208 at 1.7V. This 0.1V difference is within typical LED tolerance ranges. However, circuit design must accommodate the higher brightness (240mcd vs. 12.6mcd) and increased test current (20mA vs. 10mA). Resistor values in current-limiting circuits may require adjustment.

Q: What is the difference between HLMP-D105 and HLMP-D105-M0002?

A: Both parts are electrically identical. HLMP-D105 is supplied in bulk packaging, while HLMP-D105-M0002 is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements: bulk for manual assembly or small quantities; Tape & Reel for automated pick-and-place equipment.

Q: Why do MV3750 series parts operate at 2.2V instead of 1.7V?

A: MV3750 series parts are designed for different circuit applications requiring higher forward voltage operation. These parts are suitable for designs where 2.2V forward voltage is specified. Direct substitution in 1.7V circuits requires circuit redesign.

Q: Is HLMP-D155 suitable for low-current applications?

A: Yes. HLMP-D155 operates at 1mA test current with 10mcd brightness, matching the LTL-4208 brightness specification. This part is appropriate for low-power indicator applications. HLMP-D105 operates at higher current (20mA) and is suitable for applications requiring increased brightness.

Q: What compliance certifications are relevant for new designs?

A: ROHS3 compliance and REACH unaffected status are confirmed for HLMP-D105, HLMP-D105-M0002, HLMP-D155, and HLMP-D155-F0002. These certifications are standard for new product designs in regulated markets. MV3750B4R0 has undefined REACH status and non-applicable RoHS status; verification with the supplier is required for compliance-critical applications.

Q: Are all substitute parts available in the same through-hole package?

A: Yes. All substitute parts listed use 5mm T-1 3/4 through-hole radial packages with clear lenses. Physical form factor compatibility is confirmed across all substitutes. Height variations exist (8.60mm to 12.44mm maximum); verify PCB clearance for applications with height constraints.

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