MR3750 LED Red Diffused T-1 3/4 Through Hole - Equivalent & Substitute Parts

Part Overview

The onsemi MR3750 is a red diffused LED indicator in T-1 3/4 through-hole package designed for 5V discrete indication applications. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The MR3750 operates at 5V forward voltage with a 4mcd brightness rating and 60° viewing angle, suitable for standard red indication circuits.

Key Parameters

Parameter	Value
Manufacturer Part Number	MR3750
Manufacturer	onsemi
Color	Red
Lens Transparency	Diffused
Lens Size	5mm, T-1 3/4
Voltage - Forward (Vf) (Typ)	5V
Current - Test	10mA
Millicandela Rating	4mcd
Viewing Angle	60°
Mounting Type	Through Hole
Wavelength - Peak	635nm
Package / Case	Radial
Height (Max)	11.56mm
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the MR3750 is determined by the following critical parameters:

Primary Matching Criteria:

Color: Red
Lens Transparency: Diffused
Lens Size: 5mm, T-1 3/4
Mounting Type: Through Hole
Package / Case: Radial
Viewing Angle: 60°
Current - Test: 10mA

Secondary Considerations:

Voltage - Forward (Vf): 5V operation (primary design point)
Wavelength - Peak: 635nm red spectrum
Millicandela Rating: Brightness level for indication purposes
Product Status: Active status preferred for ongoing availability
RoHS Compliance: ROHS3 compliance for modern supply chain requirements

Substitute parts are grouped into two categories: direct voltage equivalents (5V forward voltage) and lower voltage alternatives (1.9V forward voltage) that require circuit redesign but maintain mechanical and optical compatibility.

Parameter Comparison

Parameter	MR3750 (Main)	HLMP-3600	HLMP-3301	HLMP-3301-D0000	HLMP-3301-D0001	HLMP-3301-D0002	HLMP-3301-F0002	HLMP-3301-F00DD	333-2SDRD/S530-A3
Manufacturer	onsemi	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Everlight Electronics Co Ltd
Color	Red	Red	Red	Red	Red	Red	Red	Red	Red
Lens Transparency	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused
Lens Size	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	5.00mm Dia
Voltage - Forward (Vf) (Typ)	5V	5V	1.9V	1.9V	1.9V	1.9V	1.9V	1.9V	2V
Current - Test	10mA	10mA	10mA	10mA	10mA	10mA	10mA	10mA	20mA
Millicandela Rating	4mcd	2.1mcd	5.4mcd	2.1mcd	2.1mcd	2.1mcd	5.4mcd	5.4mcd	160mcd
Viewing Angle	60°	60°	60°	60°	60°	60°	60°	60°	30°
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Wavelength - Peak	635nm	635nm	635nm	635nm	635nm	635nm	635nm	635nm	650nm
Package / Case	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial	Radial
Height (Max)	11.56mm	9.19mm	9.19mm	9.19mm	9.19mm	9.19mm	9.19mm	9.19mm	8.90mm
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Voltage Equivalent (5V Forward Voltage):

HLMP-3600 from Broadcom Limited is the primary direct substitute for the MR3750. This part maintains identical 5V forward voltage operation, 10mA test current, 60° viewing angle, and T-1 3/4 5mm lens size. HLMP-3600 is active product status with ROHS3 compliance, ensuring long-term availability and modern supply chain compatibility. The 2.1mcd brightness is slightly lower than the MR3750's 4mcd, but remains suitable for standard indication applications. Height is reduced to 9.19mm, which may require PCB layout verification for existing designs.

Lower Voltage Alternatives (1.9V Forward Voltage):

The HLMP-3301 series from Broadcom Limited provides mechanical and optical compatibility with reduced forward voltage operation. These parts require circuit redesign to accommodate 1.9V operation instead of 5V. Available variants include:

HLMP-3301: Base part, 5.4mcd brightness, bulk packaging
HLMP-3301-D0000: 2.1mcd brightness, bulk packaging
HLMP-3301-D0001: 2.1mcd brightness, tape & reel packaging
HLMP-3301-D0002: 2.1mcd brightness, cut tape packaging
HLMP-3301-F0002: 5.4mcd brightness, cut tape packaging
HLMP-3301-F00DD: 5.4mcd brightness, cut tape packaging (highest inventory)

All HLMP-3301 variants are active product status with ROHS3 compliance. Selection among variants depends on packaging requirements and brightness specifications.

Alternative Brightness Option:

333-2SDRD/S530-A3 from Everlight Electronics Co Ltd offers significantly higher brightness at 160mcd with 2V forward voltage. This part features a narrower 30° viewing angle compared to the MR3750's 60°, and operates at 20mA test current. This option is suitable only for applications where higher brightness and narrower viewing angle are acceptable, and where 2V operation can be accommodated in circuit design.

Compliance Consideration:

All substitute parts listed are ROHS3 compliant, addressing the MR3750's RoHS non-compliant status. This compliance upgrade is beneficial for modern manufacturing and supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can HLMP-3600 be used as a direct drop-in replacement for MR3750?

A: HLMP-3600 maintains the same 5V forward voltage, 10mA test current, 60° viewing angle, and T-1 3/4 lens size as the MR3750, making it mechanically and electrically compatible. However, the reduced height (9.19mm vs 11.56mm) requires verification that PCB mounting and clearance specifications are satisfied in your design.

Q: What is the difference between HLMP-3301 variants?

A: HLMP-3301 variants differ in packaging format and brightness rating. Brightness variants are 5.4mcd (HLMP-3301, HLMP-3301-F0002, HLMP-3301-F00DD) and 2.1mcd (HLMP-3301-D0000, HLMP-3301-D0001, HLMP-3301-D0002). Packaging options include bulk, tape & reel, and cut tape. All variants operate at 1.9V forward voltage and 10mA test current.

Q: Can I use a 1.9V LED in a 5V circuit designed for the MR3750?

A: No. The HLMP-3301 series operates at 1.9V forward voltage, requiring circuit redesign to accommodate the lower voltage. Direct substitution in a 5V circuit will result in excessive current and component failure. Circuit modifications to the current-limiting resistor or power supply are necessary.

Q: Why is the 333-2SDRD/S530-A3 from Everlight not recommended as a primary substitute?

A: The 333-2SDRD/S530-A3 operates at 2V forward voltage and 20mA test current, requiring circuit redesign. Its 30° viewing angle is narrower than the MR3750's 60°, limiting the field of view. The significantly higher brightness (160mcd) may be excessive for standard indication applications. This part is suitable only when higher brightness and narrower viewing angle are design requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant, addressing the MR3750's RoHS non-compliant status. This compliance upgrade supports modern manufacturing standards and supply chain requirements.

Q: What packaging options are available for the HLMP-3301 series?

A: HLMP-3301 series parts are available in bulk, tape & reel (TR), and cut tape (CT) packaging. Selection depends on production volume and assembly process requirements. Bulk packaging is suitable for lower volumes, while tape & reel and cut tape formats support automated assembly.

Q: Is the MR3750 still available for purchase?

A: The MR3750 is classified as obsolete. While 976 pieces are reported in stock, long-term availability is not assured. Transition to an active substitute part such as HLMP-3600 is recommended for new designs and ongoing production support.

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