HLMPD150A Red LED T-1 3/4 Through Hole - Equivalent & Substitute Parts

Part Overview

The HLMPD150A is a red diffused LED indicator manufactured by onsemi, configured as a T-1 3/4 (5mm) through-hole component with a forward voltage of 1.6V at 1mA test current and a peak wavelength of 660nm. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	HLMPD150A
Manufacturer	onsemi
Color	Red
Lens Transparency	Diffused
Lens Size	5mm, T-1 3/4
Voltage - Forward (Vf) (Typ)	1.6V
Current - Test	1mA
Millicandela Rating	3mcd
Viewing Angle	65°
Wavelength - Peak	660nm
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	8.89mm
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the HLMPD150A is determined by the following critical parameters:

Color and Lens Transparency: Red diffused lens required for visual indication compatibility
Lens Size and Mounting Type: T-1 3/4 (5mm) through-hole configuration for mechanical fit and PCB compatibility
Voltage and Current Characteristics: Forward voltage (Vf) and test current determine circuit compatibility and current-limiting resistor requirements
Wavelength: Peak wavelength in the red spectrum (630-660nm range) for color consistency
Millicandela Rating: Brightness level affects visibility in the application context
Viewing Angle: Determines the angular range of light emission
Product Status: Active status preferred for long-term availability

Substitute parts are grouped based on matching the core mechanical form factor (T-1 3/4 through-hole red diffused LED) while accommodating variations in electrical characteristics that may require circuit design adjustments.

Parameter Comparison

Part Number	Manufacturer	Color	Lens Size	Vf (Typ)	Current - Test	mcd	Viewing Angle	Peak Wavelength	Height (Max)	Product Status	RoHS Status
HLMPD150A	onsemi	Red	5mm, T-1 3/4	1.6V	1mA	3mcd	65°	660nm	8.89mm	Obsolete	-
151051RS11000	Würth Elektronik	Red	4.90mm Dia	2.1V	20mA	30mcd	60°	650nm	8.95mm	Active	ROHS3 Compliant
4302H1-12V	Visual Communications Company - VCC	Red	5mm, T-1 3/4	12V	13mA	8mcd	60°	635nm	10.08mm	Active	ROHS3 Compliant
4302H1-5V	Visual Communications Company - VCC	Red	5mm, T-1 3/4	5V	10mA	8mcd	60°	635nm	10.08mm	Active	ROHS3 Compliant
HLMP-3301	Broadcom Limited	Red	5mm, T-1 3/4	1.9V	10mA	5.4mcd	60°	635nm	9.19mm	Active	ROHS3 Compliant
HLMP-3301-D0000	Broadcom Limited	Red	5mm, T-1 3/4	1.9V	10mA	2.1mcd	60°	635nm	9.19mm	Active	ROHS3 Compliant
HLMP-3301-D0001	Broadcom Limited	Red	5mm, T-1 3/4	1.9V	10mA	2.1mcd	60°	635nm	9.19mm	Active	ROHS3 Compliant
HLMP-3301-D0002	Broadcom Limited	Red	5mm, T-1 3/4	1.9V	10mA	2.1mcd	60°	635nm	9.19mm	Active	ROHS3 Compliant
HLMP-3301-F0001	Broadcom Limited	Red	5mm, T-1 3/4	1.9V	10mA	5.4mcd	60°	635nm	9.19mm	Active	ROHS3 Compliant
HLMP-3301-F0002	Broadcom Limited	Red	5mm, T-1 3/4	1.9V	10mA	5.4mcd	60°	635nm	9.19mm	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Closest Electrical Match)

The HLMP-3301 series from Broadcom Limited provides the closest electrical and mechanical compatibility. The HLMP-3301, HLMP-3301-F0001, and HLMP-3301-F0002 variants maintain the T-1 3/4 form factor with forward voltage of 1.9V (0.3V higher than HLMPD150A) and 10mA test current. These parts are ROHS3 compliant and carry active product status, ensuring long-term availability. The 5.4mcd brightness rating is slightly higher than the original 3mcd, suitable for most indication applications. Wavelength peak at 635nm is within acceptable red spectrum tolerance.

Secondary Substitutes (Form Factor Match with Voltage Variation)

The VCC 4302H1-5V offers identical T-1 3/4 mechanical compatibility with 5V forward voltage and 10mA test current. This part is appropriate for applications where the circuit operates at 5V logic levels. The 8mcd brightness and 60° viewing angle differ from the original specification but remain within typical indicator application ranges. ROHS3 compliance and active status support procurement continuity.

The VCC 4302H1-12V is suitable for 12V system applications, though the 12V forward voltage represents a significant departure from the original 1.6V specification and requires dedicated circuit design.

Alternative Consideration

The Würth Elektronik 151051RS11000 maintains red diffused lens characteristics and similar height profile but uses a 4.90mm diameter lens (versus 5mm T-1 3/4) and requires 20mA test current. This part is ROHS3 compliant and active but represents a form factor variation that may require mechanical re-evaluation in the PCB layout.

All recommended substitutes carry ROHS3 compliance and active product status, supporting regulatory requirements and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can HLMP-3301 series parts directly replace HLMPD150A without circuit modification?

A: The HLMP-3301 series maintains mechanical compatibility (T-1 3/4 through-hole) and similar forward voltage (1.9V vs. 1.6V). The 0.3V difference is within typical LED tolerance and may not require circuit redesign for most applications. However, current-limiting resistor values should be verified based on the specific circuit voltage supply and desired brightness level.

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

A: These are variants of the same base product (HLMP-3301) with differences in packaging and brightness rating. HLMP-3301-D0000 and HLMP-3301-D0001 are rated at 2.1mcd (lower brightness), while HLMP-3301 and HLMP-3301-F0001 are rated at 5.4mcd (higher brightness). Packaging options include Bulk, Tape & Reel (TR), and Cut Tape (CT). Select based on procurement volume requirements and brightness needs.

Q: Is the Würth Elektronik 151051RS11000 mechanically compatible with HLMPD150A?

A: The 151051RS11000 has a 4.90mm diameter lens versus the 5mm T-1 3/4 specification of HLMPD150A. While the height profile is similar (8.95mm vs. 8.89mm), the lens diameter variation may affect mechanical fit in the PCB mounting hole. Physical verification is necessary before design release.

Q: Why do VCC 4302H1 parts have higher forward voltages (5V and 12V)?

A: These parts are designed for direct connection to logic-level power supplies without external current-limiting resistors. The 4302H1-5V is optimized for 5V systems, and the 4302H1-12V for 12V systems. Selection depends on the circuit voltage supply. For low-voltage applications (1.6V-2.1V range), use HLMP-3301 series or similar low-voltage red LEDs.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts carry ROHS3 compliance status. The original HLMPD150A does not specify RoHS status due to its obsolete classification. Compliance verification with your regulatory requirements is recommended before final part selection.

Q: What viewing angle should I select?

A: The HLMPD150A has a 65° viewing angle, while most substitutes offer 60°. The 5° difference is minor for typical indicator applications. Select based on the specific visibility requirements of your application. Narrower viewing angles concentrate light intensity in the forward direction, while wider angles distribute light over a broader area.

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