MT3118-Y-A Yellow LED Equivalent & Substitute Parts

Part Overview

The MT3118-Y-A is a yellow 590nm LED indication component manufactured by Marktech Optoelectronics. This through-hole radial LED features a 5mm diffused round lens with domed top, rated at 2.1V forward voltage and 27.5mcd brightness. The component is Active status and RoHS Compliant, suitable for discrete LED indication applications in electronic assemblies.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter ranges for this LED category.

Key Parameters

Parameter	MT3118-Y-A Value
Color	Yellow
Wavelength - Dominant	590nm
Wavelength - Peak	585nm
Voltage - Forward (Vf) Typical	2.1V
Current - Test	20mA
Millicandela Rating	27.5mcd
Lens Size	5.00mm Dia
Lens Style	Round with Domed Top
Lens Transparency	Diffused
Viewing Angle	35°
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	9.20mm
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitute parts for the MT3118-Y-A are grouped based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Color: Yellow
Wavelength - Dominant: 585nm to 590nm range
Wavelength - Peak: 583nm to 585nm range
Voltage - Forward (Vf): 2.0V to 2.1V
Mounting Type: Through Hole
Lens Transparency: Diffused
Package / Case: Radial

Secondary Compatibility Factors:

Lens Size: 5mm nominal (4.75mm to 5.00mm acceptable)
Lens Style: Round with Domed Top
Height (Max): 8.21mm to 9.20mm
Current - Test: 10mA to 20mA

Parts that deviate significantly from these parameters (such as HLMP-3650 at 5V, HLMP-3651 at 12V, HLMP-4719 at 1.8V, or HLMP-D401 in orange color) are listed for reference but do not qualify as direct substitutes due to incompatible electrical specifications or color mismatch.

Parameter Comparison

Parameter	MT3118-Y-A	5219673F	HLMP-3401	HLMP-3401-E0002	LTL-307Y
Manufacturer	Marktech Optoelectronics	Dialight	Broadcom Limited	Broadcom Limited	Lite-On Inc.
Color	Yellow	Yellow	Yellow	Yellow	Yellow
Wavelength - Dominant	590nm	588nm	585nm	585nm	590nm
Wavelength - Peak	585nm	585nm	583nm	583nm	585nm
Voltage - Forward (Vf) Typical	2.1V	2.1V	2V	2V	2.1V
Current - Test	20mA	20mA	10mA	10mA	20mA
Millicandela Rating	27.5mcd	12.6mcd	5.7mcd	5.7mcd	29mcd
Lens Size	5.00mm Dia	4.75mm Dia	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
Lens Transparency	Diffused	Diffused	Diffused	Diffused	Diffused
Viewing Angle	35°	60°	60°	60°	50°
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Height (Max)	9.20mm	8.21mm	9.19mm	9.19mm	8.60mm
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Substitutes (Electrical & Mechanical Compatibility):

LTL-307Y (Lite-On Inc.) is the closest functional equivalent to MT3118-Y-A. Both components share identical wavelength specifications (590nm dominant, 585nm peak), forward voltage (2.1V), test current (20mA), and lens size (5.00mm). Brightness ratings are comparable (29mcd vs 27.5mcd). Both are RoHS3 Compliant and Active status. Height differential (8.60mm vs 9.20mm) is within acceptable mechanical tolerance for standard through-hole PCB applications.

5219673F (Dialight) maintains electrical compatibility with 2.1V forward voltage and 20mA test current. Wavelength specifications (588nm dominant, 585nm peak) fall within acceptable yellow LED range. Lens size (4.75mm) represents minor mechanical variation. Brightness is reduced (12.6mcd), which may impact visibility in applications requiring higher luminous intensity. RoHS3 Compliant and Active status.

Limited Substitutes (Electrical Deviations):

HLMP-3401 and HLMP-3401-E0002 (Broadcom Limited) operate at 2V forward voltage with 10mA test current, representing reduced electrical demand. Wavelength specifications (585nm dominant, 583nm peak) remain within yellow LED range. Brightness is significantly lower (5.7mcd). These parts are suitable only for applications where reduced brightness and lower current draw are acceptable. Both are RoHS3 Compliant and Active status. HLMP-3401-E0002 is available in Cut Tape packaging with higher inventory (35,845 pcs).

Non-Substitutes (Incompatible Parameters):

HLMP-3401-E00B2, HLMP-3650, HLMP-3651, HLMP-4719, HLMP-4719-A0002, and HLMP-D401 do not qualify as substitutes due to incompatible electrical specifications or color mismatch and are excluded from selection consideration.

Frequently Asked Questions (FAQ)

Q: Can LTL-307Y replace MT3118-Y-A in all applications?

A: LTL-307Y is electrically and mechanically compatible with MT3118-Y-A. Both share 2.1V forward voltage, 20mA test current, 590nm dominant wavelength, and 5mm lens size. Height difference (8.60mm vs 9.20mm) is within standard PCB clearance tolerances. Brightness ratings are comparable (29mcd vs 27.5mcd). Substitution is valid for standard indication applications.

Q: What is the impact of using 5219673F instead of MT3118-Y-A?

A: 5219673F maintains 2.1V forward voltage and 20mA test current compatibility. Wavelength (588nm dominant) remains in yellow spectrum. Primary differences are reduced brightness (12.6mcd vs 27.5mcd) and slightly smaller lens diameter (4.75mm vs 5.00mm). Applications requiring high luminous intensity may experience reduced visibility. Mechanical fit is acceptable for standard through-hole mounting.

Q: Why are HLMP-3401 variants listed if they have lower brightness?

A: HLMP-3401 and variants maintain yellow color, diffused lens, and through-hole mounting compatibility. Forward voltage (2V) and test current (10mA) represent reduced electrical demand, suitable for low-power indication circuits. Brightness reduction (5.7mcd) is a trade-off for lower power consumption. Selection depends on application power budget and visibility requirements.

Q: Can HLMP-3650 or HLMP-3651 substitute for MT3118-Y-A?

A: No. HLMP-3650 operates at 5V forward voltage and HLMP-3651 at 12V, both incompatible with MT3118-Y-A's 2.1V specification. These parts are designed for different circuit voltage domains and cannot be directly substituted without circuit redesign.

Q: What packaging options are available for substitute parts?

A: MT3118-Y-A is supplied in Bulk packaging. LTL-307Y and 5219673F are available in Bulk. HLMP-3401 is available in Bulk packaging. HLMP-3401-E0002 is available in Cut Tape (CT) packaging with significantly higher inventory (35,845 pcs), suitable for automated assembly processes. Packaging selection depends on assembly method and volume requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. MT3118-Y-A is RoHS Compliant. All listed substitute parts (LTL-307Y, 5219673F, HLMP-3401, HLMP-3401-E0002) are ROHS3 Compliant. All parts are REACH Unaffected or REACH Affected, meeting current environmental compliance standards.

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