HLMP1719 Yellow LED Diffused T-1 Through-Hole Equivalent & Substitute Parts

Part Overview

The HLMP1719 is a yellow diffused LED indicator manufactured by Everlight Electronics Co Ltd, designed for discrete indication applications in through-hole mounting configurations. This T-1 form factor LED operates at 1.9V forward voltage with a 2mA test current and delivers 2 millicandela of luminous intensity. The component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified to address component availability, supply chain continuity, and design flexibility while maintaining functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	HLMP1719 (Everlight)
Color	Yellow
Lens Transparency	Diffused
Lens Style	Round with Domed Top
Lens Size	3.10mm Dia
Voltage - Forward (Vf) Typical	1.9V
Current - Test	2mA
Millicandela Rating	2mcd
Viewing Angle	50°
Wavelength - Peak	585nm
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	6.30mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the HLMP1719 are grouped based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

Color: Yellow
Lens Transparency: Diffused
Mounting Type: Through Hole
Package Configuration: Radial T-1 form factor
RoHS3 Compliance: Required
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Compatibility Parameters:

Voltage - Forward (Vf): Range 1.8V to 2.1V
Current - Test: Range 2mA to 20mA
Millicandela Rating: 2mcd to 30mcd
Viewing Angle: 40° to 60°
Wavelength - Peak: 583nm to 590nm
Height (Max): 5.55mm to 6.55mm

Parts meeting all primary criteria and operating within secondary parameter ranges are classified as direct substitutes. Parts with differing color, lens transparency, or mounting configuration are excluded from substitution consideration.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Color	Lens Transparency	Vf (Typ)	Current - Test	mcd Rating	Viewing Angle	Wavelength - Peak	Height (Max)	RoHS Status
HLMP1719	Everlight Electronics	Yellow	Diffused	1.9V	2mA	2mcd	50°	585nm	6.30mm	ROHS3
HLMP-1719	Broadcom Limited	Yellow	Diffused	1.8V	2mA	2.1mcd	50°	585nm	6.35mm	ROHS3
HLMP-1719-A0002	Broadcom Limited	Yellow	Diffused	1.8V	2mA	2.1mcd	50°	585nm	6.35mm	ROHS3
LTL-4251	Lite-On Inc.	Yellow	Diffused	2.1V	10mA	8.7mcd	40°	585nm	6.55mm	ROHS3
LTL-4251N	Lite-On Inc.	Yellow	Diffused	2.1V	10mA	5.6mcd	60°	585nm	5.85mm	ROHS3
151031YS05900	Würth Elektronik	Yellow	Diffused	2.1V	20mA	30mcd	60°	585nm	5.55mm	ROHS3

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility):

The HLMP-1719 and HLMP-1719-A0002 from Broadcom Limited are direct substitutes for the Everlight HLMP1719. Both parts share identical electrical characteristics (1.8V forward voltage, 2mA test current, 2.1mcd rating) and mechanical specifications (50° viewing angle, 585nm peak wavelength, 6.35mm maximum height). The primary difference is packaging format: HLMP-1719 is supplied in Bulk, while HLMP-1719-A0002 is supplied in Cut Tape. Both maintain ROHS3 compliance and unlimited moisture sensitivity rating. These substitutes are suitable for direct replacement in existing designs without circuit modification.

Compatible Substitutes (Parameter Variation):

The LTL-4251 and LTL-4251N from Lite-On Inc. are compatible substitutes with acceptable parameter variation. Both operate at 2.1V forward voltage (0.2V higher than the main part) with 10mA test current (5x higher). The LTL-4251 delivers 8.7mcd with 40° viewing angle, while LTL-4251N delivers 5.6mcd with 60° viewing angle. Both maintain 585nm peak wavelength and ROHS3 compliance. Circuit design must accommodate the increased forward voltage and test current requirements.

The 151031YS05900 from Würth Elektronik operates at 2.1V forward voltage with 20mA test current and delivers 30mcd luminous intensity with 60° viewing angle. This part exhibits significantly higher brightness and wider viewing angle. Circuit design must accommodate the increased forward voltage and test current. This part is suitable for applications requiring higher luminous intensity or wider viewing angle distribution.

Compliance Status:

All identified substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the original component's environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the HLMP-1719 from Broadcom be used as a direct replacement for the Everlight HLMP1719?

A: Yes. The Broadcom HLMP-1719 is a direct substitute. Both parts operate at approximately 1.8-1.9V forward voltage with 2mA test current and deliver 2-2.1mcd luminous intensity. Mechanical dimensions are nearly identical (6.30mm vs 6.35mm maximum height). No circuit modification is required.

Q: What is the difference between HLMP-1719 and HLMP-1719-A0002?

A: Both parts are electrically and mechanically identical. The difference is packaging format: HLMP-1719 is supplied in Bulk packaging, while HLMP-1719-A0002 is supplied in Cut Tape (CT) packaging. Selection depends on assembly process requirements and tape-and-reel compatibility.

Q: Can I use the LTL-4251 in place of the HLMP1719?

A: The LTL-4251 is a compatible substitute with parameter variation. It operates at 2.1V forward voltage (compared to 1.9V) and requires 10mA test current (compared to 2mA). The LTL-4251 delivers 8.7mcd with a narrower 40° viewing angle. Circuit design must accommodate the higher forward voltage and increased current draw. This part is suitable for applications where higher brightness is beneficial.

Q: What is the difference between LTL-4251 and LTL-4251N?

A: Both parts share identical electrical specifications (2.1V forward voltage, 10mA test current, 585nm peak wavelength). The primary differences are luminous intensity and viewing angle: LTL-4251 delivers 8.7mcd with 40° viewing angle and 6.55mm maximum height, while LTL-4251N delivers 5.6mcd with 60° viewing angle and 5.85mm maximum height. Selection depends on required brightness level and viewing angle distribution.

Q: Is the 151031YS05900 from Würth Elektronik a suitable substitute?

A: The 151031YS05900 is a compatible substitute for applications requiring higher luminous intensity and wider viewing angle. It operates at 2.1V forward voltage with 20mA test current and delivers 30mcd with 60° viewing angle. Circuit design must accommodate the significantly increased forward voltage and test current. This part is not suitable for direct replacement in low-current designs but is appropriate for applications requiring enhanced brightness and wider light distribution.

Q: Do all substitute parts maintain RoHS3 compliance?

A: Yes. All identified substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the original Everlight HLMP1719 component's environmental and regulatory requirements.

Q: What parameters must remain constant when selecting a substitute?

A: The following parameters must remain constant: Color (Yellow), Lens Transparency (Diffused), Mounting Type (Through Hole), Package Configuration (Radial T-1), and RoHS3 Compliance. Forward voltage, test current, and luminous intensity may vary within acceptable ranges depending on circuit design requirements.

Q: Can I use an orange LED as a substitute for the yellow HLMP1719?

A: No. Color substitution is not permitted. The HLMP1719 is specified as yellow (585nm peak wavelength). Orange LEDs operate at different wavelengths (605nm) and are not functionally equivalent for color-specific indication applications.

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