HLMP4700 Red Diffused LED T-1 3/4 Through Hole - Equivalent & Substitute Parts

Part Overview

The HLMP4700 is a red diffused LED indicator manufactured by onsemi, designed for discrete indication applications in through-hole mounting configurations. This component features a 5mm T-1 3/4 lens form factor with a forward voltage of 1.8V and a test current of 2mA, optimized for low-power indication circuits. The HLMP4700 is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support, production continuity, and component sourcing.

Key Parameters

Parameter	Value
Manufacturer Part Number	HLMP4700
Manufacturer	onsemi
Color	Red
Lens Transparency	Diffused
Lens Size	5mm, T-1 3/4
Voltage - Forward (Vf) (Typ)	1.8V
Current - Test	2mA
Millicandela Rating	2mcd
Viewing Angle	35°
Wavelength - Peak	635nm
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	6.30mm
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the HLMP4700 are identified based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Color: Red
Lens Transparency: Diffused
Lens Size: 5mm, T-1 3/4 form factor
Mounting Type: Through Hole, Radial configuration
Wavelength - Peak: 635nm (red spectrum)

Secondary Compatibility Considerations:

Voltage - Forward (Vf): Acceptable range 1.8V to 2.1V for direct circuit substitution
Current - Test: 2mA to 20mA operational range
Millicandela Rating: 2mcd to 30mcd (brightness variation acceptable depending on application requirements)
Viewing Angle: 35° to 60° (wider angles provide greater visibility)

Substitute parts meeting these criteria maintain mechanical and electrical compatibility with the HLMP4700 footprint and circuit interface, enabling direct replacement in through-hole PCB applications.

Parameter Comparison

Parameter	HLMP4700	151051RS11000	4302H1-12V	4302H1-5V	HLMP-3301	HLMP-3301-D0000	HLMP-3301-D0001	HLMP-3301-D0002	HLMP-3301-F0001	HLMP-3301-F0002
Manufacturer	onsemi	Würth Elektronik	VCC	VCC	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited
Color	Red	Red	Red	Red	Red	Red	Red	Red	Red	Red
Lens Transparency	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused
Lens Size	5mm, T-1 3/4	4.90mm 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
Voltage - Forward (Vf) (Typ)	1.8V	2.1V	12V	5V	1.9V	1.9V	1.9V	1.9V	1.9V	1.9V
Current - Test	2mA	20mA	13mA	10mA	10mA	10mA	10mA	10mA	10mA	10mA
Millicandela Rating	2mcd	30mcd	8mcd	8mcd	5.4mcd	2.1mcd	2.1mcd	2.1mcd	5.4mcd	5.4mcd
Viewing Angle	35°	60°	60°	60°	60°	60°	60°	60°	60°	60°
Wavelength - Peak	635nm	650nm	635nm	635nm	635nm	635nm	635nm	635nm	635nm	635nm
Mounting Type	Through Hole	Through Hole	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	Radial	Radial
Height (Max)	6.30mm	8.95mm	10.08mm	10.08mm	9.19mm	9.19mm	9.19mm	9.19mm	9.19mm	9.19mm
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (Lowest Risk):

The HLMP-3301 series from Broadcom Limited represents the closest functional equivalent to the HLMP4700. These parts maintain identical lens form factor (5mm T-1 3/4), diffused red color, 635nm peak wavelength, and through-hole radial mounting. Forward voltage (1.9V) is within 0.1V of the original specification, and test current (10mA) is compatible with standard indicator circuit designs. All HLMP-3301 variants are active products with ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Secondary Substitutes (Moderate Compatibility):

The 4302H1-5V from Visual Communications Company (VCC) provides mechanical and optical compatibility with identical lens size and form factor. This part operates at 5V forward voltage, requiring circuit redesign for applications originally specified at 1.8V. The 4302H1-12V variant is suitable only for 12V indicator circuits and is not recommended for low-voltage applications.

The 151051RS11000 from Würth Elektronik (WL-TMRC series) offers compatible through-hole radial mounting and diffused red lens characteristics. However, the 4.90mm lens diameter represents a minor dimensional variation from the 5mm standard, and the 2.1V forward voltage and 20mA test current require circuit verification before implementation.

Product Status Consideration:

All substitute parts listed are active products with current manufacturing status, ensuring supply chain continuity and technical support availability. The HLMP4700 obsolete status necessitates transition to one of these active alternatives for new designs or production restocking.

Frequently Asked Questions (FAQ)

Q: Can the HLMP-3301 series directly replace the HLMP4700 without circuit modification?

A: The HLMP-3301 series maintains electrical compatibility within standard indicator circuit tolerances. Forward voltage difference (1.9V vs. 1.8V) is 0.1V, which is acceptable for most series-resistor-limited indicator applications. Verify circuit current-limiting resistor values to confirm adequate brightness at the specified test current of 10mA.

Q: What is the difference between HLMP-3301, HLMP-3301-D0000, and HLMP-3301-F0001?

A: These variants represent the same base LED (HLMP-3301) in different packaging configurations. HLMP-3301 is supplied in bulk packaging, HLMP-3301-D0000 in bulk with specific brightness binning (2.1mcd), HLMP-3301-D0001 in tape and reel format, HLMP-3301-D0002 in cut tape format, HLMP-3301-F0001 in tape and reel with higher brightness (5.4mcd), and HLMP-3301-F0002 in cut tape with higher brightness. Electrical and optical performance are identical within each brightness group; selection depends on procurement and assembly requirements.

Q: Is the 151051RS11000 suitable as a direct replacement?

A: The 151051RS11000 is mechanically compatible but requires circuit evaluation. The 4.90mm lens diameter is slightly smaller than the 5mm standard, which may affect visual appearance in panel-mount applications. The 2.1V forward voltage and 20mA test current are higher than the HLMP4700 specification, necessitating resistor recalculation to maintain proper brightness and current limiting.

Q: Why are the VCC 4302H1 parts listed as substitutes if they operate at different voltages?

A: The 4302H1-5V and 4302H1-12V are included as mechanical and optical equivalents for applications where circuit voltage is already established at 5V or 12V respectively. These parts are not suitable for 1.8V or 2V circuits without significant redesign. Selection depends on the host circuit voltage specification.

Q: What compliance certifications should I verify for production use?

A: All active substitute parts listed carry ROHS3 compliance certification, confirming restriction of hazardous substances compliance. REACH status is unaffected for all parts, indicating no regulatory restrictions on use. Verify ECCN classification (EAR99 for all listed parts) for export control compliance if applicable to your supply chain.

Q: Does lens size variation affect interchangeability?

A: The 5mm T-1 3/4 form factor is standard across most substitutes and ensures mechanical fit in through-hole PCB layouts. The 151051RS11000 with 4.90mm diameter is functionally compatible but may present minor visual differences in panel-mount applications where lens appearance is critical. For internal circuit indication, this variation is not significant.

Q: What is the significance of the 35° viewing angle on the HLMP4700 compared to 60° on substitutes?

A: The HLMP4700 has a narrower viewing angle (35°), providing more directional light output. Substitute parts with 60° viewing angles provide wider visibility but may appear less bright when viewed directly due to light distribution over a larger angle. For applications requiring specific directional indication, verify that the wider viewing angle of substitutes meets visibility requirements.

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