HLMP1719MP4B Yellow LED Circuit Board Indicator - Equivalent & Substitute Parts

Part Overview

The HLMP1719MP4B is a 3mm T-1 through-hole yellow LED circuit board indicator manufactured by Everlight Electronics Co Ltd. This component features a diffused, tinted lens with a round domed top, rated for 2V operation at 2mA, delivering 2mcd luminous intensity at a 50° viewing angle with a peak wavelength of 585nm.

The HLMP1719MP4B is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for applications utilizing this component.

Key Parameters

Parameter	Value
Manufacturer Part Number	HLMP1719MP4B
Manufacturer	Everlight Electronics Co Ltd
Color	Yellow
Lens Type	Diffused, Tinted
Lens Style	Round with Domed Top
Lens Size	3mm, T-1
Voltage Rating	2V
Current	2mA
Millicandela Rating	2mcd
Wavelength - Peak	585nm
Viewing Angle	50°
Mounting Type	Through Hole
Configuration	Single
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the HLMP1719MP4B is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Color: Yellow
Lens Type: Diffused, Tinted
Lens Style: Round with Domed Top
Lens Size: 3mm, T-1
Mounting Type: Through Hole
Configuration: Single
Wavelength Range: 583nm to 590nm (peak wavelength tolerance)

Secondary Compatibility Parameters:

Voltage Rating: 2V nominal operation
Current: 2mA nominal test current
Millicandela Rating: 2mcd to 2.2mcd range
Viewing Angle: 40° to 60° acceptable range
MSL: 1 (Unlimited)

Substitute parts must satisfy all primary criteria and operate within the secondary parameter ranges to ensure functional equivalence in circuit board indicator applications. Parts with different voltage ratings (5V, 12V) or significantly different current requirements are listed for reference but require circuit design modifications and are not direct substitutes.

Parameter Comparison

Part Number	Manufacturer	Color	Voltage (V)	Current (mA)	mcd	Wavelength Peak (nm)	Viewing Angle (°)	Lens Type	Mounting	Status
HLMP1719MP4B	Everlight	Yellow	2	2	2	585	50	Diffused, Tinted	Through Hole	Obsolete
HLMP-1719	Broadcom	Yellow	1.8	2	2.1	585	50	Diffused	Through Hole	Active
HLMP-1719-A0002	Broadcom	Yellow	1.8	2	2.1	585	50	Diffused	Through Hole	Active
HLMP-1401	Broadcom	Yellow	2	10	2.2	583	60	Diffused	Through Hole	Active
LTL-4251	Lite-On	Yellow	2.1	10	8.7	585	40	Diffused	Through Hole	Active
LTL-4251N	Lite-On	Yellow	2.1	10	5.6	585	60	Diffused	Through Hole	Active
3YD-F	Bivar	Yellow	2	20	20	590	35	Diffused	Through Hole	Active
HLMP-1620	Broadcom	Yellow	5	10	2.2	583	60	Diffused	Through Hole	Active
HLMP-1620-C00A1	Broadcom	Yellow	5	10	2.2	583	60	Diffused, Tinted	Through Hole, Right Angle	Active
HLMP-1620-C00A2	Broadcom	Yellow	5	10	2.2	583	60	Diffused, Tinted	Through Hole, Right Angle	Active
HLMP-1621	Broadcom	Yellow	12	13	2.2	583	60	Diffused	Through Hole	Active

Engineering Selection Recommendations

Direct Substitutes (2V Operation, 2mA Current Class):

The HLMP-1719 and HLMP-1719-A0002 from Broadcom Limited are the closest functional equivalents to the HLMP1719MP4B. Both parts operate at 1.8V nominal forward voltage with 2mA test current, deliver 2.1mcd luminous intensity, maintain the 50° viewing angle, and feature diffused yellow lenses in 3mm T-1 through-hole packages. These parts are in active production status with ROHS3 compliance and unlimited MSL rating. The HLMP-1719-A0002 is supplied in Cut Tape (CT) packaging, while HLMP-1719 is supplied in bulk.

Compatible Alternatives (2V Operation, Higher Current):

The HLMP-1401 from Broadcom operates at 2V with 10mA test current, delivering 2.2mcd at a 60° viewing angle. This part maintains wavelength compatibility (583nm peak) and is suitable for applications where slightly increased brightness and wider viewing angle are acceptable. The higher test current requires circuit verification to ensure compliance with application current budgets.

Voltage-Dependent Alternatives:

Parts such as HLMP-1620, HLMP-1620-C00A1, HLMP-1620-C00A2, and HLMP-1621 operate at 5V and 12V respectively and are not direct substitutes without circuit redesign. These parts are listed for reference in applications requiring different supply voltages.

Compliance Status:

All recommended substitute parts carry ROHS3 compliance and REACH Unaffected or REACH Affected status. The HLMP-1719 series from Broadcom is recommended as the primary replacement due to active production status, parameter alignment, and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can HLMP-1719 directly replace HLMP1719MP4B without circuit modification?

A: The HLMP-1719 operates at 1.8V nominal forward voltage compared to the HLMP1719MP4B at 2V. Both are rated for 2mA operation. Direct substitution is possible in most circuit designs; however, verify that the circuit can accommodate the 0.2V difference in forward voltage drop. The luminous intensity (2.1mcd vs. 2mcd) and viewing angle (50°) are equivalent.

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

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

Q: Why are LTL-4251 and LTL-4251N listed as substitutes if they require 10mA?

A: These parts are listed as available alternatives because they maintain the same 2V nominal voltage class, yellow color, diffused lens type, and 3mm T-1 form factor. However, the 10mA test current (versus 2mA for the main part) requires circuit design verification. These parts deliver higher luminous intensity (5.6mcd to 8.7mcd), making them suitable only for applications where increased brightness is acceptable and current budget permits.

Q: Can HLMP-1620 or HLMP-1621 be used as substitutes?

A: No. HLMP-1620 operates at 5V and HLMP-1621 operates at 12V. These parts require different circuit designs and are not compatible with 2V applications without voltage regulation modifications. They are listed for reference only in applications with different supply voltages.

Q: What does "Diffused, Tinted" lens type mean compared to "Diffused"?

A: Both lens types scatter light to provide a wide viewing angle and uniform brightness. The "Tinted" designation indicates the lens material contains color pigmentation. This distinction does not affect substitution compatibility for circuit board indicator applications, as both provide equivalent optical performance for status indication purposes.

Q: Are there any compliance or regulatory differences between substitute parts?

A: All recommended substitute parts carry ROHS3 compliance. The HLMP-1719 series is REACH Unaffected, while LTL-4251 is REACH Affected. For applications subject to REACH regulations, verify compliance requirements with your supply chain or regulatory department before final part selection.

Q: What is the significance of the 50° versus 60° viewing angle difference?

A: The HLMP1719MP4B and HLMP-1719 maintain a 50° viewing angle, providing a narrower, more focused light distribution. Parts with 60° viewing angles (such as HLMP-1401 and LTL-4251N) distribute light over a wider area. Selection depends on the application's viewing geometry and brightness requirements at specific angles.

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