HLMPK155MP4B LED Circuit Board Indicator - Equivalent & Substitute Parts

Part Overview

The HLMPK155MP4B is a 3mm red circuit board indicator LED manufactured by onsemi, designed for through-hole, right-angle mounting applications. This part operates at 1.6V with 1mA current and delivers 3 millicandela brightness with a 45° viewing angle. The product is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications requiring compatible red LED indicators in the T-1 3mm form factor.

Key Parameters

Parameter	Value
Manufacturer Part Number	HLMPK155MP4B
Manufacturer	onsemi
Color	Red
Wavelength - Peak	660nm
Lens Size	3mm, T-1
Lens Style	Round with Domed Top
Lens Type	Tinted
Voltage Rating	1.6V
Current	1mA
Millicandela Rating	3mcd
Viewing Angle	45°
Mounting Type	Through Hole, Right Angle
Configuration	Single
Product Status	Obsolete
Moisture Sensitivity Level	1 (Unlimited)
RoHS Status	Not specified

Substitute Part Grouping Explanation

Substitution eligibility for the HLMPK155MP4B is determined by the following critical parameters:

Primary Compatibility Criteria:

Lens size: 3mm, T-1 form factor
Mounting type: Through hole configuration
Color: Red
Configuration: Single LED
Moisture sensitivity level: 1 (Unlimited)

Secondary Compatibility Considerations:

Voltage rating tolerance (1.6V nominal allows operation in circuits designed for 1.7V to 2.2V forward voltage)
Current rating (1mA to 20mA test current range acceptable for indicator applications)
Millicandela rating (1.6mcd to 35mcd suitable for visual indication)
Viewing angle (35° to 60° acceptable for general indicator use)
Wavelength peak (625nm to 660nm within red spectrum)

Substitute parts are grouped into two categories: direct mechanical replacements with similar electrical characteristics, and functional equivalents with different voltage/current ratings suitable for alternative circuit designs.

Parameter Comparison

Parameter	HLMPK155MP4B	151031SS06000	3HD-F	4300F1LC	5511107F	HLMP-1301-G00FG	HLMP-1700
Manufacturer	onsemi	Würth Elektronik	Bivar Inc.	Visual Communications Company	Dialight	Broadcom Limited	Broadcom Limited
Color	Red	Red	Red	Red	Red	Red	Red
Lens Size	3mm, T-1	3.00mm Dia	3mm, T-1	3mm, T-1	3mm, T-1	3mm, T-1	3mm, T-1
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
Mounting Type	Through Hole, Right Angle	Through Hole	Through Hole	Through Hole	Through Hole, Right Angle	Through Hole	Through Hole
Configuration	Single	Standard	Standard	Standard	Single	Standard	Standard
Voltage - Forward (Typ)	1.6V	2.2V	2V	1.8V	1.7V	1.9V	1.7V
Current	1mA	20mA	20mA	2mA	2mA	10mA	2mA
Millicandela Rating	3mcd	35mcd	30mcd	1.8mcd	1.6mcd	8.6mcd	2.1mcd
Viewing Angle	45°	60°	35°	50°	60°	60°	50°
Wavelength - Peak	660nm	650nm	625nm	635nm	635nm	635nm	635nm
Lens Transparency	Tinted	Diffused	Diffused	Diffused	Diffused, Tinted	Diffused	Diffused
Product Status	Obsolete	Active	Active	Not For New Designs	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Mechanical Replacement (Right-Angle Through-Hole Mount):

The 5511107F from Dialight is the primary substitute for applications requiring identical mounting orientation. This part maintains right-angle through-hole configuration with compatible voltage (1.7V) and current (2mA) ratings. Product status is active with ROHS3 compliance, ensuring long-term availability and regulatory compliance.

For Standard Through-Hole Applications (Radial Mount):

The HLMP-1700 from Broadcom Limited is the recommended substitute for applications where radial mounting is acceptable. This part offers the closest electrical match with 1.7V forward voltage and 2mA test current, delivering 2.1mcd brightness. With 530,300 units in stock and active product status, this part provides superior availability and supply chain stability. ROHS3 compliance is confirmed.

The HLMP-1301-G00FG from Broadcom Limited provides an alternative for applications tolerating higher current (10mA) and brightness (8.6mcd). This part is suitable for designs requiring increased visibility while maintaining the 3mm T-1 form factor and through-hole mounting.

For Low-Brightness Applications:

The 4300F1LC from Visual Communications Company matches the original part's low current requirement (2mA) and operates at 1.8V. However, this part carries "Not For New Designs" status, limiting its suitability for new production.

For High-Brightness Applications:

The 151031SS06000 from Würth Elektronik and 3HD-F from Bivar Inc. deliver significantly higher brightness (35mcd and 30mcd respectively) at 20mA test current. These parts are suitable for applications requiring enhanced visibility but require circuit redesign to accommodate higher current draw.

All substitute parts maintain MSL 1 (Unlimited) moisture sensitivity rating and ECCN EAR99 classification, matching the original part's environmental and export characteristics.

Frequently Asked Questions (FAQ)

Q: Can I use HLMP-1700 as a direct replacement for HLMPK155MP4B?

A: The HLMP-1700 is functionally equivalent but differs in mounting style. The HLMPK155MP4B features right-angle through-hole mounting, while HLMP-1700 uses radial through-hole mounting. Both operate at compatible voltage (1.6V vs. 1.7V) and current (1mA vs. 2mA) levels. Substitution is valid if your PCB layout accommodates radial lead orientation.

Q: What is the difference between tinted and diffused lens types?

A: The HLMPK155MP4B uses a tinted lens, which provides color saturation through the lens material itself. Substitute parts with diffused lenses scatter light more broadly, affecting viewing angle and brightness perception. Both lens types are suitable for indicator applications; selection depends on desired visual characteristics and circuit board layout constraints.

Q: Why do some substitutes have higher millicandela ratings?

A: Millicandela rating reflects brightness at specified test current. The HLMPK155MP4B operates at 1mA, producing 3mcd. Substitutes like 151031SS06000 operate at 20mA test current, producing 35mcd. Higher brightness requires higher current draw and circuit redesign. Select brightness level based on application visibility requirements.

Q: Are all substitute parts RoHS compliant?

A: All listed substitute parts carry ROHS3 compliance certification. The original HLMPK155MP4B does not specify RoHS status due to its obsolete classification. For new designs, select from active-status parts with confirmed ROHS3 compliance: HLMP-1700, HLMP-1301-G00FG, 5511107F, 3HD-F, or 151031SS06000.

Q: What is the viewing angle significance for indicator LEDs?

A: Viewing angle determines the cone of light visibility. The HLMPK155MP4B offers 45° viewing angle. Substitutes range from 35° to 60°. Wider angles (60°) provide visibility from more positions but may appear dimmer at direct viewing. Narrower angles (35°) concentrate brightness but limit off-axis visibility. Select based on intended observer position relative to the indicator.

Q: Can I substitute a 5V-rated LED for the 1.6V original part?

A: No. The HLMP-1600 and HLMP-1600-D00A2 operate at 5V and require complete circuit redesign with appropriate current-limiting resistors. Direct substitution without circuit modification will damage the LED. Use only parts with compatible voltage ratings: 1.6V to 2.2V forward voltage range.

Q: What does "Not For New Designs" product status mean?

A: Parts marked "Not For New Designs" (such as 4300F1LC) are available for existing product support but not recommended for new development. These parts may have limited future availability or planned discontinuation. For new designs, prioritize parts with "Active" status: HLMP-1700, HLMP-1301-G00FG, 5511107F, 3HD-F, or 151031SS06000.

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