Equivalent & Substitute Parts for CMD3450 Green LED T-1 3/4 Through Hole

Part Overview

The CMD3450 is a green LED indicator manufactured by Visual Communications Company (VCC) in a T-1 3/4 through-hole package. This component is classified as obsolete, which necessitates identification of functionally equivalent substitute parts for ongoing design support and procurement. The CMD3450 features a 5mm clear lens with 150 millicandela brightness rating, 2.2V forward voltage, and 24-degree viewing angle, designed for discrete LED indication applications requiring standard green wavelength output at 565nm peak.

Key Parameters

Parameter	Value	Substitution Relevance
Color	Green	Critical - determines wavelength compatibility
Lens Transparency	Clear	Critical - affects light transmission and appearance
Lens Size	5mm, T-1 3/4	Critical - determines mechanical fit in PCB
Voltage - Forward (Vf) Typical	2.2V	Critical - affects circuit design and current limiting
Current - Test	20mA	Critical - determines power dissipation and brightness
Millicandela Rating	150mcd	Important - affects visibility and application suitability
Viewing Angle	24°	Important - determines directional light distribution
Wavelength - Peak	565nm	Important - confirms green spectrum compliance
Mounting Type	Through Hole	Critical - determines PCB assembly compatibility
Package / Case	Radial	Critical - determines lead configuration
Height (Max)	8.89mm	Important - affects PCB clearance and assembly
RoHS Status	ROHS3 Compliant	Important - regulatory compliance requirement

Substitute Part Grouping Explanation

Substitute parts for the CMD3450 are grouped based on strict adherence to the following critical parameters:

Primary Substitution Criteria (Must Match):

Color: Green
Lens Size: 5mm, T-1 3/4
Mounting Type: Through Hole
Package / Case: Radial
Voltage - Forward (Vf) Typical: 2.2V
Current - Test: 20mA

Secondary Compatibility Parameters (Should Match for Direct Replacement):

Lens Transparency: Clear
Millicandela Rating: 150mcd (or within acceptable brightness tolerance)
Viewing Angle: 24° (or compatible range)
Wavelength - Peak: 565nm (green spectrum)
Height (Max): 8.89mm (or within PCB clearance limits)

Regulatory Compliance:

RoHS3 Compliant
REACH Unaffected
ECCN: EAR99

Parts that deviate from primary criteria (such as diffused lens transparency, different forward voltage, or different current ratings) are identified as functional alternatives suitable only for applications where those parameter differences are acceptable.

Parameter Comparison

Part Number	Manufacturer	Status	Color	Lens Transparency	Vf (Typ)	Current (mA)	mcd Rating	Viewing Angle	Peak Wavelength	Height (Max)	RoHS3
CMD3450	VCC	Obsolete	Green	Clear	2.2V	20	150	24°	565nm	8.89mm	Yes
HLMP-3950	Broadcom Limited	Active	Green	Clear	2.2V	20	265	24°	565nm	12.44mm	Yes
HLMP3950AA4R0	Everlight Electronics Co Ltd	Active	Green	Clear	2.2V	20	150	24°	565nm	8.89mm	Yes
MV5452	onsemi	Obsolete	Green	Clear	2.2V	20	25	35°	562nm	8.89mm	No
HLMP-4740	Broadcom Limited	Active	Green	Diffused	1.9V	2	2.3	50°	565nm	9.19mm	Yes
HLMP4740A3R0	Everlight Electronics Co Ltd	Active	Green	Diffused	1.9V	2	1.2	50°	585nm	8.89mm	Yes
MV5453	onsemi	Obsolete	Green	Diffused	2.2V	20	20	75°	562nm	8.89mm	No
MV5453A3R0	Everlight Electronics Co Ltd	Active	Green	Diffused	2.2V	20	20	75°	562nm	8.89mm	Yes
MV5453A4A0	Everlight Electronics Co Ltd	Active	Green	Diffused	2.2V	20	20	75°	562nm	8.89mm	Yes
MV5454A	onsemi	Obsolete	Green	Diffused	2.2V	20	30	24°	562nm	8.89mm	No
HLMP47409MP94	onsemi	Obsolete	Green (x 2)	Diffused, Tinted	1.9V	2	2.3	50°	565nm	N/A	No

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility):

HLMP3950AA4R0 (Everlight Electronics Co Ltd) is the preferred direct substitute for CMD3450. This part maintains identical electrical parameters (2.2V forward voltage, 20mA test current), identical mechanical form factor (5mm T-1 3/4 through-hole radial package, 8.89mm maximum height), identical lens transparency (clear), identical viewing angle (24°), and identical wavelength characteristics (565nm peak). The part is currently in active production status with unlimited moisture sensitivity rating and full RoHS3 compliance. Inventory availability is confirmed at 1134 pieces.

HLMP-3950 (Broadcom Limited) provides electrical and optical compatibility with CMD3450 but exhibits a height variance (12.44mm maximum versus 8.89mm). This height difference may affect PCB clearance in space-constrained applications. The part delivers higher brightness (265mcd versus 150mcd), which may be acceptable or beneficial depending on application requirements. Product status is active with unlimited moisture sensitivity rating and full RoHS3 compliance. Inventory availability is confirmed at 10400 pieces.

Functional Alternatives (Parameter Deviations Acceptable):

HLMP-4740 (Broadcom Limited) and HLMP4740A3R0 (Everlight Electronics Co Ltd) are suitable substitutes where diffused lens transparency is acceptable and lower brightness operation is required. These parts operate at 1.9V forward voltage and 2mA test current, requiring circuit redesign for current limiting. Viewing angle expands to 50°, providing wider light distribution. Both parts maintain T-1 3/4 through-hole radial package compatibility and are in active production with RoHS3 compliance.

MV5453A3R0 and MV5453A4A0 (Everlight Electronics Co Ltd) provide electrical parameter matching (2.2V, 20mA) with CMD3450 but feature diffused lens transparency and wider viewing angle (75°). These parts are in active production status with RoHS3 compliance and unlimited moisture sensitivity rating. Wavelength peak is 562nm, within acceptable green spectrum range.

Not Recommended for Direct Substitution:

MV5452 (onsemi) and MV5454A (onsemi) are obsolete products lacking RoHS3 compliance certification. MV5453 (onsemi) is obsolete and lacks RoHS3 compliance. HLMP47409MP94 (onsemi) is a dual-LED configuration unsuitable for single-LED applications and is obsolete.

Frequently Asked Questions (FAQ)

Q: Can HLMP-3950 replace CMD3450 directly in my PCB design?

A: HLMP-3950 is electrically and optically compatible with CMD3450 but has a maximum height of 12.44mm compared to CMD3450's 8.89mm. Verify that your PCB clearance accommodates this 3.55mm height difference. The higher brightness (265mcd versus 150mcd) may require circuit adjustment if brightness consistency is critical across multiple designs.

Q: What is the key difference between HLMP3950AA4R0 and HLMP-3950?

A: HLMP3950AA4R0 (Everlight) maintains the original 8.89mm height specification matching CMD3450, while HLMP-3950 (Broadcom) is 12.44mm tall. Both are electrically identical. Choose HLMP3950AA4R0 for direct mechanical replacement without PCB redesign.

Q: Can I use HLMP-4740 as a substitute for CMD3450?

A: HLMP-4740 is not a direct substitute. It operates at 1.9V forward voltage and 2mA test current versus CMD3450's 2.2V and 20mA. Circuit redesign is required to accommodate these electrical differences. The diffused lens and 50-degree viewing angle differ from CMD3450's clear lens and 24-degree angle. Use HLMP-4740 only if your application requirements permit these parameter changes.

Q: Are all substitute parts RoHS3 compliant?

A: No. HLMP3950AA4R0, HLMP-3950, HLMP-4740, HLMP4740A3R0, MV5453A3R0, and MV5453A4A0 are RoHS3 compliant. MV5452, MV5453, MV5454A, and HLMP47409MP94 are not RoHS3 compliant. Verify compliance requirements for your application before selection.

Q: What does "obsolete" product status mean for my design?

A: Obsolete products are no longer manufactured and have limited remaining inventory. CMD3450 is obsolete, which is why substitute identification is necessary. Active-status parts (HLMP3950AA4R0, HLMP-3950, HLMP-4740, HLMP4740A3R0, MV5453A3R0, MV5453A4A0) are currently produced and offer long-term availability assurance.

Q: Can I interchange clear and diffused lens LEDs in the same application?

A: No. Clear and diffused lenses produce different optical characteristics. Clear lenses (CMD3450, HLMP-3950, HLMP3950AA4R0, MV5452) provide focused light output with narrow viewing angles. Diffused lenses (HLMP-4740, HLMP4740A3R0, MV5453, MV5453A3R0, MV5453A4A0, MV5454A) scatter light over wider angles. Application requirements determine which lens type is appropriate.

Q: What is the significance of millicandela (mcd) rating differences?

A: Millicandela rating indicates brightness at the specified test current. CMD3450 is rated 150mcd at 20mA. HLMP-3950 delivers 265mcd at the same current, providing approximately 77% greater brightness. MV5452 delivers only 25mcd, approximately 83% lower brightness. Select parts with mcd ratings matching your visibility requirements.

Q: Do all T-1 3/4 through-hole LEDs have identical mechanical fit?

A: T-1 3/4 designation specifies 5mm lens diameter and through-hole mounting, but maximum height varies. CMD3450 is 8.89mm tall, while HLMP-3950 is 12.44mm tall. Verify height specifications against your PCB clearance requirements before substitution.

Q: What viewing angle should I select for my application?

A: Viewing angle determines light distribution directivity. CMD3450 has 24-degree viewing angle, providing focused light in a narrow cone. HLMP-4740 and HLMP4740A3R0 have 50-degree angles for wider distribution. MV5453 variants have 75-degree angles for maximum spread. Select based on whether your application requires focused or dispersed light output.

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