MR3450 LED Green Diffused T-1 3/4 Through Hole - Equivalent & Substitute Parts

Part Overview

The MR3450 is a green diffused LED indicator manufactured by onsemi, designed for 5V discrete indication applications in through-hole mounting configurations. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance requirements. The MR3450 operates at 5V forward voltage with a 10mA test current and provides 4mcd brightness in a standard T-1 3/4 (5mm) package with 60° viewing angle and 565nm peak wavelength.

Key Parameters

Parameter	MR3450 Specification
Manufacturer	onsemi
Color	Green
Lens Transparency	Diffused
Lens Size	5mm, T-1 3/4
Voltage - Forward (Vf) Typical	5V
Current - Test	10mA
Millicandela Rating	4mcd
Viewing Angle	60°
Mounting Type	Through Hole
Wavelength - Peak	565nm
Package / Case	Radial
Height (Max)	11.56mm
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the MR3450 is determined by the following critical parameters: color (green), lens transparency (diffused), lens size (5mm T-1 3/4 form factor), mounting type (through hole radial), and forward voltage operating range. The MR3450 operates at 5V, which is significantly higher than most modern green LED indicators. Substitute parts are grouped into two categories:

Category 1: Direct Voltage Equivalents (5V Operation) Parts maintaining 5V forward voltage specification to ensure direct circuit compatibility without resistor recalculation.

Category 2: Lower Voltage Alternatives (2V-2.1V Operation) Parts operating at 2V to 2.1V forward voltage, requiring circuit redesign or resistor adjustment but offering improved efficiency and RoHS3 compliance.

The allowed substitution parameters include: color match (green or yellow-green), lens transparency (diffused), package type (radial through hole), lens size (4.7mm to 5.0mm diameter), and mechanical compatibility (height and form factor).

Parameter Comparison

Part Number	Manufacturer	Color	Vf (Typ)	Current - Test	mcd Rating	Viewing Angle	Wavelength - Peak	Height (Max)	Product Status	RoHS Status	Packaging
MR3450	onsemi	Green	5V	10mA	4mcd	60°	565nm	11.56mm	Obsolete	RoHS non-compliant	-
4302H5-5V	Visual Communications Company - VCC	Green	5V	12mA	8mcd	60°	565nm	10.08mm	Active	ROHS3 Compliant	Bulk
HLMP-3507	Broadcom Limited	Green	2.1V	10mA	4.2mcd	60°	565nm	9.19mm	Active	ROHS3 Compliant	Bulk
HLMP-3507-D0001	Broadcom Limited	Green	2.1V	10mA	4.2mcd	60°	565nm	9.19mm	Active	ROHS3 Compliant	Tape & Reel (TR)
HLMP-3507-D0002	Broadcom Limited	Green	2.1V	10mA	4.2mcd	60°	565nm	9.19mm	Active	ROHS3 Compliant	Cut Tape (CT)
HLMP-3507-D00B1	Broadcom Limited	Green	2.1V	10mA	4.2mcd	60°	565nm	-	Active	ROHS3 Compliant	Bulk
HLMP-3507-D00B2	Broadcom Limited	Green	2.1V	10mA	4.2mcd	-	565nm	-	Active	ROHS3 Compliant	Bulk
151051VS04000	Würth Elektronik	Green	2.1V	20mA	140mcd	40°	573nm	8.95mm	Active	ROHS3 Compliant	Bulk
1383SYGD/S530-E2	Everlight Electronics Co Ltd	Yellow-Green	2V	20mA	200mcd	25°	575nm	8.90mm	Active	ROHS3 Compliant	Bulk
323-2SYGD/S530-E2	Everlight Electronics Co Ltd	Yellow-Green	2V	20mA	80mcd	60°	575nm	6.30mm	Active	ROHS3 Compliant	Tube
336SYGSYGD/S530-E2	Everlight Electronics Co Ltd	Yellow-Green	2V	20mA	16mcd	90°	575nm	8.90mm	Active	-	Bulk

Engineering Selection Recommendations

Primary Recommendation: 4302H5-5V (Visual Communications Company)

The 4302H5-5V is the optimal direct replacement for the MR3450. It maintains identical 5V forward voltage operation, eliminating circuit redesign requirements. The part is pin-compatible, operates at 12mA test current (within acceptable tolerance of the original 10mA specification), and delivers 8mcd brightness—double the original specification. The 4302H5-5V is ROHS3 compliant and carries active product status with current manufacturing support. Height specification of 10.08mm is compatible with the original 11.56mm envelope. This part requires no circuit modifications and provides direct functional equivalence.

Secondary Recommendation: HLMP-3507 Series (Broadcom Limited)

The HLMP-3507, HLMP-3507-D0001, HLMP-3507-D0002, HLMP-3507-D00B1, and HLMP-3507-D00B2 represent the most widely available green LED alternatives. These parts operate at 2.1V forward voltage and require circuit resistor recalculation. All variants are ROHS3 compliant with active product status. The HLMP-3507 base part in bulk packaging offers maximum availability (4255 pcs in stock). Tape & Reel (HLMP-3507-D0001) and Cut Tape (HLMP-3507-D0002) packaging options support automated assembly. The HLMP-3507-D00B1 and HLMP-3507-D00B2 variants feature right-angle mounting configurations for circuit board indicator applications. Brightness specification of 4.2mcd closely matches the original 4mcd rating.

Alternative Consideration: 151051VS04000 (Würth Elektronik)

The 151051VS04000 operates at 2.1V forward voltage with 20mA test current and delivers 140mcd brightness. This part is suitable for applications requiring higher brightness output. The WL-TMRC series designation indicates active product support. ROHS3 compliance and REACH unaffected status confirm regulatory alignment. The 40° viewing angle is narrower than the original 60° specification, requiring application-specific evaluation.

Yellow-Green Alternatives (Everlight Electronics)

The 1383SYGD/S530-E2, 323-2SYGD/S530-E2, and 336SYGSYGD/S530-E2 operate at 2V forward voltage with yellow-green color (573-575nm wavelength). These parts are suitable only for applications where color shift from pure green to yellow-green is acceptable. The 1383SYGD/S530-E2 delivers 200mcd brightness with 25° viewing angle. The 323-2SYGD/S530-E2 provides 80mcd with 60° viewing angle in tube packaging. The 336SYGSYGD/S530-E2 offers 16mcd with wide 90° viewing angle. All three are ROHS3 compliant with active product status.

Frequently Asked Questions (FAQ)

Q: Can the 4302H5-5V be used as a direct drop-in replacement for the MR3450?

A: Yes. The 4302H5-5V maintains 5V forward voltage operation, identical 60° viewing angle, and compatible T-1 3/4 form factor. No circuit modifications are required. The part is mechanically and electrically compatible with existing MR3450 designs.

Q: What is the primary difference between the MR3450 and HLMP-3507 series?

A: The MR3450 operates at 5V forward voltage, while the HLMP-3507 series operates at 2.1V. This voltage difference requires circuit resistor recalculation when substituting. The HLMP-3507 series offers superior RoHS3 compliance and active product status compared to the obsolete MR3450.

Q: Are the HLMP-3507-D0001, HLMP-3507-D0002, HLMP-3507-D00B1, and HLMP-3507-D00B2 electrically identical?

A: Yes, all HLMP-3507 variants share identical electrical specifications: 2.1V forward voltage, 10mA test current, and 4.2mcd brightness. The differences are packaging format (bulk, tape & reel, cut tape) and mounting configuration (standard radial or right-angle). Select based on assembly process requirements.

Q: Can yellow-green LEDs (Everlight 1383SYGD/S530-E2, 323-2SYGD/S530-E2, 336SYGSYGD/S530-E2) replace the green MR3450?

A: Yellow-green substitution is possible only if the application tolerates color shift from pure green (565nm) to yellow-green (573-575nm). These parts operate at 2V forward voltage and require circuit redesign. Evaluate color perception requirements before selection.

Q: What packaging options are available for high-volume production?

A: The HLMP-3507-D0001 is supplied in Tape & Reel format for automated pick-and-place assembly. The HLMP-3507-D0002 is supplied in Cut Tape format. Bulk packaging is available for manual assembly or lower-volume applications. The 4302H5-5V is supplied in bulk packaging.

Q: Does the MR3450 substitution require compliance verification?

A: The MR3450 is RoHS non-compliant. All recommended substitutes (4302H5-5V, HLMP-3507 series, 151051VS04000, and Everlight parts) are ROHS3 compliant. Verify that your application and supply chain requirements mandate RoHS3 compliance before final part selection.

Q: What is the brightness difference between the MR3450 and substitute parts?

A: The MR3450 provides 4mcd brightness. The 4302H5-5V delivers 8mcd (2x brighter). The HLMP-3507 series provides 4.2mcd (equivalent). The 151051VS04000 delivers 140mcd (35x brighter). The Everlight yellow-green parts range from 16mcd to 200mcd. Select based on application brightness requirements.

Q: Are all substitute parts through-hole mounted?

A: Yes, all listed substitute parts are through-hole mounted with radial lead configuration, maintaining mechanical compatibility with the original MR3450 footprint.

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