MT240-G-A Equivalent & Substitute Parts

Part Overview

The MT240-G-A is a green diffused 3mm round through-hole LED manufactured by Marktech Optoelectronics, designed for indication applications. This component features a 572nm dominant wavelength, 2.1V forward voltage, and 16mcd brightness rating. The part is Active status and ROHS3 compliant. Substitute parts may be required due to inventory constraints, manufacturing discontinuation, or application-specific performance requirements such as brightness variation, viewing angle optimization, or voltage tolerance differences.

Key Parameters

Parameter	MT240-G-A Value	Substitution Relevance
Color	Green	Critical - must match
Lens Transparency	Diffused	Critical - must match
Mounting Type	Through Hole	Critical - must match
Voltage - Forward (Vf) (Typ)	2.1V	High - tolerance ±0.2V acceptable
Current - Test	20mA	High - operating point reference
Millicandela Rating	16mcd	Medium - application dependent
Viewing Angle	60°	Medium - application dependent
Wavelength - Dominant	572nm	Medium - visual perception
Lens Size	3.00mm Dia	High - mechanical fit
Package / Case	Radial	Critical - must match
RoHS Status	ROHS3 Compliant	High - regulatory requirement

Substitute Part Grouping Explanation

Substitution logic is based on the following allowed parameters:

Critical Match Requirements:

Color: Green
Lens Transparency: Diffused
Mounting Type: Through Hole
Package / Case: Radial
RoHS Status: ROHS3 Compliant

High Tolerance Parameters:

Voltage - Forward (Vf): 2.0V to 2.2V range acceptable
Lens Size: 3.0mm to 3.2mm diameter acceptable for T-1 packages
Current - Test: 10mA to 20mA operating range

Medium Flexibility Parameters:

Millicandela Rating: 10mcd to 40mcd range
Viewing Angle: 35° to 85° range
Wavelength - Dominant: 557nm to 572nm range (green spectrum)

Substitute parts are grouped into two categories:

Category A - Direct Mechanical Equivalents (3mm Round T-1 Package): Parts with matching 3mm lens diameter and T-1 package form factor, forward voltage within 2.0V to 2.2V range, and diffused green lens.

Category B - Alternative Form Factors: Parts with different lens sizes (2mm, 3.2mm) or alternative package designations that maintain electrical compatibility but require mechanical verification.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	Current - Test	mcd Rating	Viewing Angle	Wavelength - Dominant	Lens Size	Height (Max)	RoHS Status
MT240-G-A	Marktech Optoelectronics	2.1V	20mA	16mcd	60°	572nm	3.00mm	5.80mm	ROHS3
3GD-F	Bivar Inc.	2.1V	20mA	25mcd	35°	—	3mm T-1	5.30mm	ROHS3
LTL-4231	Lite-On Inc.	2.1V	10mA	12.6mcd	40°	569nm	3mm T-1	6.55mm	ROHS3
SLR-332MG3F	Rohm Semiconductor	2.1V	10mA	16mcd	85°	572nm	3.20mm	4.60mm	ROHS3
SSL-LX20465GD	Lumex Opto/Components Inc.	2.2V	20mA	10mcd	70°	—	2.00mm	5.00mm	ROHS3
SSL-LX3044GD	Lumex Opto/Components Inc.	2.2V	20mA	40mcd	60°	—	3mm T-1	4.60mm	ROHS3
SSL-LX3052GD	Lumex Opto/Components Inc.	2.0V	20mA	15mcd	80°	—	3mm T-1	5.25mm	ROHS3
WP710A10GD	Kingbright	2.2V	20mA	25mcd	40°	568nm	3mm T-1	5.90mm	ROHS3
WP710A10LGD	Kingbright	1.9V	2mA	2mcd	40°	568nm	3mm T-1	5.90mm	ROHS3
WP710A10PGD	Kingbright	2.25V	20mA	8mcd	40°	557nm	3mm T-1	5.90mm	ROHS3
WP908A8GD	Kingbright	2.2V	20mA	25mcd	80°	568nm	3mm T-1	5.50mm	ROHS3

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, meeting regulatory requirements equivalent to the MT240-G-A.

For Direct Replacement (Minimal Circuit Redesign): SLR-332MG3F, 3GD-F, and WP710A10GD are suitable where forward voltage tolerance of ±0.1V and matching 2.1V to 2.2V range is acceptable. These parts maintain 20mA test current compatibility and green diffused lens specifications.

For Brightness-Critical Applications: SSL-LX3044GD (40mcd) provides increased luminous intensity. WP710A10LGD and WP710A10PGD operate at significantly reduced current (2mA and 20mA respectively) and are suitable only for low-power indication circuits.

For Wide Viewing Angle Requirements: SLR-332MG3F (85°), WP908A8GD (80°), and SSL-LX3052GD (80°) provide expanded viewing angle compared to the MT240-G-A (60°).

For Narrow Viewing Angle Requirements: 3GD-F (35°) and WP710A10GD (40°) provide restricted viewing angle suitable for directional indication.

For Mechanical Constraints: SSL-LX20465GD features a 2.0mm lens diameter (T-2mm Taper Body) and requires mechanical verification for PCB hole compatibility. SLR-332MG3F features a 3.2mm lens diameter and may require enlarged PCB apertures.

Frequently Asked Questions (FAQ)

Q: Can WP710A10LGD replace MT240-G-A directly? A: No. WP710A10LGD operates at 1.9V and 2mA test current, producing only 2mcd brightness. This part is designed for ultra-low-power applications and is not suitable for standard 20mA indication circuits.

Q: What is the maximum forward voltage variation acceptable for substitution? A: Forward voltage should remain within 2.0V to 2.2V range. The MT240-G-A operates at 2.1V typical. Parts rated 2.0V to 2.2V are compatible with standard current-limiting resistor circuits. Parts outside this range (such as WP710A10LGD at 1.9V) require circuit recalculation.

Q: Are T-1 package parts mechanically compatible with 3mm round through-hole footprints? A: T-1 designation refers to a 3mm diameter lens package. Parts listed as "3mm T-1" are mechanically compatible with standard 3mm round through-hole PCB footprints. Parts with different lens diameters (2.0mm, 3.2mm) require mechanical verification.

Q: Which substitute offers the closest electrical match to MT240-G-A? A: SLR-332MG3F matches the dominant wavelength (572nm), forward voltage (2.1V), and brightness (16mcd) of the MT240-G-A. The primary difference is viewing angle (85° versus 60°) and reduced test current (10mA versus 20mA).

Q: Is REACH compliance status relevant for substitution? A: REACH status is provided for regulatory documentation. All listed parts are ROHS3 compliant. LTL-4231 is marked as REACH Affected; other parts are REACH Unaffected. Selection should be based on end-application regulatory requirements.

Q: Can SSL-LX20465GD (2mm lens) be used in a 3mm footprint? A: No. The 2.0mm lens diameter requires a smaller PCB aperture. Mechanical verification and potential PCB redesign are necessary. This part is suitable only where 2mm form factor is required.

Q: What is the difference between Wavelength - Dominant and Wavelength - Peak? A: Wavelength - Dominant represents the perceived color wavelength. Wavelength - Peak represents the spectral peak emission. Both values are provided where available. Substitutes with wavelengths in the 565nm to 572nm range produce visually equivalent green indication.

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