HLMP1301 Red Diffused T-1 LED Equivalent & Substitute Parts

Part Overview

The HLMP1301 is a red diffused T-1 through-hole LED manufactured by onsemi, designed for discrete indication applications. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The HLMP1301 delivers 2.5mcd brightness at 2V forward voltage with a 90° viewing angle in a standard 3mm radial package.

Key Parameters

Parameter	Value
Manufacturer Part Number	HLMP1301
Manufacturer	onsemi
Product Status	Obsolete
Color	Red
Lens Transparency	Diffused
Lens Size	3mm, T-1
Voltage - Forward (Vf) (Typ)	2V
Current - Test	10mA
Millicandela Rating	2.5mcd
Viewing Angle	90°
Mounting Type	Through Hole
Wavelength - Peak	635nm
Package / Case	Radial
Height (Max)	6.30mm
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the HLMP1301 are grouped based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Color: Red
Lens Transparency: Diffused
Lens Size: 3mm, T-1
Mounting Type: Through Hole
Package / Case: Radial
Wavelength - Peak: 635nm (±range tolerance)

Secondary Electrical Parameters:

Voltage - Forward (Vf): 1.7V to 2.2V range
Current - Test: 10mA to 20mA range
Millicandela Rating: 1.8mcd to 40mcd range
Viewing Angle: 35° to 90° range

Substitutes are classified as direct equivalents (same part number from different manufacturers) or similar alternatives (functionally compatible with minor parameter variations). All listed substitutes maintain the same physical form factor, mounting method, and optical characteristics required for T-1 through-hole LED applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vf (Typ)	Current - Test	mcd Rating	Viewing Angle	Wavelength - Peak	Height (Max)	RoHS Status
HLMP1301	onsemi	Obsolete	2V	10mA	2.5mcd	90°	635nm	6.30mm	Not specified
HLMP-1301	Broadcom Limited	Active	1.9V	10mA	3.4mcd	60°	635nm	6.35mm	ROHS3 Compliant
151031SS06000	Würth Elektronik	Active	2.2V	20mA	35mcd	60°	650nm	5.55mm	ROHS3 Compliant
3HD-F	Bivar Inc.	Active	2V	20mA	30mcd	35°	625nm	5.30mm	ROHS3 Compliant
3RD-F	Bivar Inc.	Active	2.1V	20mA	2mcd	35°	700nm	5.30mm	ROHS3 Compliant
3SRD-F	Bivar Inc.	Active	1.7V	20mA	40mcd	35°	645nm	5.30mm	ROHS3 Compliant
3SRD-S	Bivar Inc.	Active	1.7V	20mA	40mcd	40°	645nm	4.50mm	ROHS3 Compliant
4300F1LC	Visual Communications Company - VCC	Not For New Designs	1.8V	2mA	1.8mcd	50°	635nm	6.35mm	ROHS3 Compliant
HLMP-1600	Broadcom Limited	Active	5V	10mA	2.1mcd	60°	635nm	6.35mm	ROHS3 Compliant
HLMP-1600-D00A1	Broadcom Limited	Active	5V	10mA	2.1mcd	60°	635nm	Not specified	ROHS3 Compliant
HLMP-1600-D00A2	Broadcom Limited	Active	5V	10mA	2.1mcd	60°	635nm	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent (Preferred for Replacement): The HLMP-1301 from Broadcom Limited is the direct equivalent to the obsolete onsemi HLMP1301. This part maintains identical part number designation, operates at compatible voltage (1.9V vs. 2V), and shares the same test current of 10mA. The Broadcom part carries active product status and ROHS3 compliance, making it suitable for new designs and ongoing production.

Active Alternatives (Compatible Substitutes): The Bivar Inc. 3SRD-F and 3SRD-S parts offer the lowest forward voltage (1.7V) with the highest brightness rating (40mcd) among active alternatives. These parts are ROHS3 compliant and suitable for applications requiring enhanced visibility. The 3SRD-S variant provides a reduced height profile (4.50mm) compared to the original HLMP1301 (6.30mm).

The Würth Elektronik 151031SS06000 delivers the highest brightness (35mcd) and operates at 2.2V forward voltage, compatible with the original specification. This part is ROHS3 compliant and available in high inventory quantities.

Voltage-Dependent Selection: The Broadcom HLMP-1600 series operates at 5V forward voltage and is suitable only for applications designed for higher voltage operation. The HLMP-1600-D00A1 and HLMP-1600-D00A2 variants feature right-angle mounting, differing from the radial configuration of the HLMP1301.

Legacy Consideration: The VCC 4300F1LC carries "Not For New Designs" status and should be avoided for new applications despite ROHS3 compliance. This part operates at reduced current (2mA test current) and lower brightness (1.8mcd).

Frequently Asked Questions (FAQ)

Q: Can I directly replace HLMP1301 with HLMP-1301 from Broadcom? A: Yes. The HLMP-1301 from Broadcom Limited is the direct equivalent. It maintains the same part number, operates at compatible voltage (1.9V vs. 2V), and shares identical test current (10mA). The Broadcom part is active and ROHS3 compliant.

Q: What is the key difference between the Bivar 3SRD-F and 3SRD-S? A: Both parts share identical electrical specifications (1.7V, 40mcd, 20mA test current). The primary difference is height: 3SRD-F measures 5.30mm maximum height, while 3SRD-S measures 4.50mm maximum height. The 3SRD-S also provides a slightly wider viewing angle (40° vs. 35°).

Q: Why does the Würth Elektronik 151031SS06000 have higher brightness than the original HLMP1301? A: The 151031SS06000 is rated at 35mcd compared to the HLMP1301's 2.5mcd. This higher brightness is achieved through different LED die characteristics and is specified at a higher test current (20mA vs. 10mA). Applications must account for this increased brightness in circuit design.

Q: Are all substitute parts ROHS3 compliant? A: All active substitute parts listed carry ROHS3 compliance. The original onsemi HLMP1301 does not specify RoHS status. The VCC 4300F1LC is ROHS3 compliant but carries "Not For New Designs" status.

Q: Can I use HLMP-1600 series as a substitute? A: The HLMP-1600 series operates at 5V forward voltage, compared to the HLMP1301's 2V specification. These parts are suitable only for applications designed for 5V operation. Additionally, the HLMP-1600-D00A1 and HLMP-1600-D00A2 variants feature right-angle mounting, differing from the radial configuration of the original part.

Q: What viewing angle should I consider when selecting a substitute? A: The original HLMP1301 provides a 90° viewing angle. Most active substitutes offer narrower angles (35° to 60°). Select based on application requirements: wider angles (60° to 90°) for general indication, narrower angles (35°) for directed viewing applications.

Q: Which substitute offers the best brightness-to-voltage ratio? A: The Bivar 3SRD-F and 3SRD-S deliver 40mcd at only 1.7V forward voltage, providing the most efficient brightness output. These parts are suitable for low-voltage applications and battery-powered designs.

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