MR3351 Yellow LED T-1 3/4 Through Hole Equivalent & Substitute Parts

Part Overview

The MR3351 is a yellow diffused LED in T-1 3/4 (5mm) through-hole package manufactured by onsemi. This component is rated for 12V forward voltage operation at 13mA test current with 4mcd luminous intensity and 60° viewing angle. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and production requirements. Substitute parts must maintain mechanical compatibility (T-1 3/4 form factor, through-hole mounting) while accommodating different voltage and current specifications in circuit design.

Key Parameters

Parameter	MR3351 Value
Manufacturer	onsemi
Color	Yellow
Lens Transparency	Diffused
Lens Size	5mm, T-1 3/4
Lens Style	Round with Domed Top
Voltage - Forward (Vf) (Typ)	12V
Current - Test	13mA
Millicandela Rating	4mcd
Viewing Angle	60°
Mounting Type	Through Hole
Wavelength - Peak	585nm
Height (Max)	11.56mm
Package / Case	Radial
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution logic for the MR3351 is determined by the following critical parameters:

Mechanical Compatibility: All substitute parts must maintain T-1 3/4 (5mm) through-hole form factor with round domed-top lens and radial package configuration to ensure PCB footprint compatibility.

Optical Properties: Yellow color, diffused lens transparency, and 585nm peak wavelength define the optical category. Substitute parts must match these specifications for consistent visual indication performance.

Electrical Characteristics: Forward voltage (Vf), test current, and millicandela rating determine circuit integration requirements. Substitutes are grouped by voltage class (1.8V, 2V, 5V, 12V) to facilitate design adaptation.

Product Status & Compliance: Active product status and RoHS3 compliance are preferred for new designs, though mechanical and optical equivalence remains the primary substitution criterion.

Substitute parts are organized into voltage-based groups reflecting the primary design parameter that must be accommodated through circuit modification.

Parameter Comparison

Parameter	MR3351	HLMP-3401	HLMP-3401-E0002	HLMP-3651	HLMP-3650	HLMP-4719	1383UYD/S530-A3
Manufacturer	onsemi	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Everlight Electronics Co Ltd
Color	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow
Lens Transparency	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	5.00mm Dia
Lens Style	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top
Voltage - Forward (Vf) (Typ)	12V	2V	2V	12V	5V	1.8V	2V
Current - Test	13mA	10mA	10mA	13mA	10mA	2mA	20mA
Millicandela Rating	4mcd	5.7mcd	5.7mcd	2.2mcd	2.2mcd	2.1mcd	800mcd
Viewing Angle	60°	60°	60°	60°	60°	50°	25°
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Wavelength - Peak	585nm	583nm	583nm	583nm	583nm	—	591nm
Height (Max)	11.56mm	9.19mm	9.19mm	9.19mm	9.19mm	9.19mm	8.90mm
Package / Case	Radial	Radial	Radial	Radial	Radial	Radial	Radial
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—

Engineering Selection Recommendations

12V Voltage Class (Direct Electrical Match): HLMP-3651 is the primary substitute for MR3351. Both parts operate at 12V forward voltage with 13mA test current, requiring no circuit modification. HLMP-3651 is active product status with ROHS3 compliance, providing long-term availability and regulatory alignment. Height difference (9.19mm vs. 11.56mm) is within typical PCB clearance tolerances for through-hole applications.

2V Voltage Class (Low-Voltage Alternative): HLMP-3401 and HLMP-3401-E0002 are mechanically and optically equivalent to MR3351 but operate at 2V forward voltage. These parts require circuit redesign to accommodate lower voltage operation. HLMP-3401-E0002 in Cut Tape packaging offers highest inventory availability (35,845 pcs). Both are ROHS3 compliant active products.

5V Voltage Class (Mid-Voltage Alternative): HLMP-3650 operates at 5V forward voltage with 10mA test current. Mechanical and optical compatibility is maintained. Circuit modification is required for voltage adaptation. ROHS3 compliance and active status support production continuity.

1.8V Voltage Class (Ultra-Low-Voltage Alternative): HLMP-4719 and HLMP-4719-A0002 operate at 1.8V with 2mA test current. These parts are suitable for low-power indicator applications. Mechanical and optical specifications match MR3351. ROHS3 compliance and active status are confirmed.

Alternative Manufacturer (Everlight): 1383UYD/S530-A3 from Everlight Electronics provides mechanical and optical compatibility at 2V operation. Significantly higher luminous intensity (800mcd vs. 4mcd) and narrower viewing angle (25° vs. 60°) represent functional differences requiring application assessment. RoHS status not specified in provided data.

Selection Priority: For direct replacement without circuit modification, HLMP-3651 is the recommended substitute. For new designs, voltage-class selection (2V, 5V, 1.8V) depends on power supply architecture and circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can HLMP-3651 replace MR3351 without circuit modification? A: Yes. HLMP-3651 matches MR3351 in forward voltage (12V), test current (13mA), color (yellow), lens transparency (diffused), and mechanical form factor (T-1 3/4 through-hole). No circuit redesign is required. Height difference (9.19mm vs. 11.56mm) does not affect through-hole PCB compatibility.

Q: What is the primary difference between MR3351 and HLMP-3401? A: Forward voltage differs: MR3351 operates at 12V while HLMP-3401 operates at 2V. Both maintain identical mechanical form factor, optical properties (yellow diffused 5mm T-1 3/4), and viewing angle (60°). Circuit modification is required to use HLMP-3401 as a substitute.

Q: Why does 1383UYD/S530-A3 have such high luminous intensity (800mcd)? A: 1383UYD/S530-A3 is designed for high-brightness indication applications. The 800mcd rating (vs. 4mcd for MR3351) reflects different optical design and intended use case. Narrower viewing angle (25° vs. 60°) concentrates light output. Application requirements determine suitability.

Q: Are all substitute parts RoHS3 compliant? A: All Broadcom Limited substitutes (HLMP series) are ROHS3 compliant. MR3351 is RoHS non-compliant. Everlight 1383UYD/S530-A3 RoHS status is not specified in provided data. Compliance verification is required for regulated applications.

Q: Can I use HLMP-4719 (1.8V) in a 12V circuit? A: No. HLMP-4719 is rated for 1.8V forward voltage operation. Direct connection to 12V supply will cause immediate component failure. Circuit redesign with appropriate current-limiting resistor is required for 1.8V operation.

Q: What is the difference between HLMP-3401 and HLMP-3401-E0002? A: Both parts are electrically and optically identical (2V, 10mA, 5.7mcd, 60° viewing angle, T-1 3/4 form factor). Primary difference is packaging: HLMP-3401 is supplied in Bulk packaging while HLMP-3401-E0002 is supplied in Cut Tape (CT). HLMP-3401-E0002 offers significantly higher inventory availability (35,845 pcs vs. 2,300 pcs).

Q: Is mechanical height difference significant between MR3351 (11.56mm) and substitutes (8.90-9.19mm)? A: Height difference of 2-3mm is within typical through-hole PCB design tolerances and does not affect electrical function or standard mounting. Visual appearance may differ slightly due to reduced standoff height. Verify clearance in specific application if height-constrained space exists.

Q: Which substitute offers the best long-term availability? A: HLMP-3401-E0002 (Broadcom Limited) offers highest inventory (35,845 pcs) and active product status with ROHS3 compliance. HLMP-3651 (12V direct match) has substantial inventory (16,828 pcs) and active status. Both support production continuity.

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