HLMP1719MP4B Yellow LED Circuit Board Indicator - Equivalent & Substitute Parts

Part Overview

The HLMP1719MP4B is a 3mm yellow diffused LED circuit board indicator manufactured by onsemi, designed for low-power indication applications. This part operates at 1.9V with a 2mA test current and delivers 2.1 millicandela brightness. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and new production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	HLMP1719MP4B
Manufacturer	onsemi
Product Status	Obsolete
Color	Yellow
Wavelength - Peak	585nm
Configuration	Single
Voltage Rating	1.9V
Current	2mA
Millicandela Rating	2.1mcd
Viewing Angle	50°
Lens Type	Diffused, Tinted
Lens Style	Round with Domed Top
Lens Size	3mm, T-1
Mounting Type	Through Hole, Right Angle
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution for the HLMP1719MP4B is determined by the following critical parameters:

Primary Compatibility Criteria:

Color: Yellow
Lens Size: 3mm, T-1
Mounting Type: Through Hole, Right Angle
Lens Type: Diffused, Tinted
Lens Style: Round with Domed Top
Configuration: Single

Electrical Compatibility Range:

Voltage Rating: 1.8V to 2.1V (low-voltage operation)
Current: 2mA to 10mA (low-current indication)
Millicandela Rating: 2.1mcd to 8.7mcd (brightness tolerance for indicator applications)
Wavelength - Peak: 583nm to 590nm (yellow spectrum)
Viewing Angle: 35° to 60° (acceptable for indicator use)

Substitute parts are classified into two categories:

Direct Substitutes: Parts with identical or near-identical electrical and mechanical specifications, suitable for direct replacement without circuit modification.

Similar Substitutes: Parts with compatible form factors and mounting but different electrical characteristics, requiring circuit design review for voltage and current compatibility.

Parameter Comparison

Parameter	HLMP1719MP4B (Main)	HLMP-1719-A00A1	HLMP-1719-A00A2	3YD-F	HLMP-1719	LTL-4251
Manufacturer	onsemi	Broadcom Limited	Broadcom Limited	Bivar Inc.	Broadcom Limited	Lite-On Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active
Color	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow
Wavelength - Peak	585nm	585nm	585nm	590nm	—	585nm
Configuration	Single	Single	Single	Standard	Standard	Standard
Voltage Rating	1.9V	1.8V	1.8V	2V	1.8V	2.1V
Current	2mA	2mA	2mA	20mA	2mA	10mA
Millicandela Rating	2.1mcd	2.1mcd	2.1mcd	20mcd	2.1mcd	8.7mcd
Viewing Angle	50°	50°	—	35°	50°	40°
Lens Type	Diffused, Tinted	Diffused, Tinted	Diffused, Tinted	Diffused	Diffused	Diffused
Lens Style	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top	Round with Domed Top
Lens Size	3mm, T-1	3mm, T-1	3mm, T-1	3mm, T-1	3mm, T-1	3mm, T-1
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole, Right Angle	Through Hole	Through Hole	Through Hole
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	—	REACH Unaffected	REACH Affected

Engineering Selection Recommendations

Direct Substitutes (Recommended for Drop-In Replacement):

HLMP-1719-A00A1 and HLMP-1719-A00A2 are the primary direct substitutes for the HLMP1719MP4B. Both are manufactured by Broadcom Limited and maintain identical electrical specifications (1.8V, 2mA, 2.1mcd) with the same 3mm T-1 form factor and right-angle mounting. Both parts carry Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. The 0.1V voltage difference (1.9V to 1.8V) is within acceptable tolerance for low-voltage indicator circuits. HLMP-1719-A00A2 offers higher inventory availability (14,100 units) compared to HLMP-1719-A00A1 (801 units).

HLMP-1719 (base series, Broadcom Limited) provides an alternative direct substitute with identical electrical characteristics and Active status. This part is available in standard radial package configuration with 21,200 units in stock.

Compatible Substitutes (Requires Circuit Review):

LTL-4251 (Lite-On Inc.) is electrically compatible with slightly elevated specifications: 2.1V forward voltage, 10mA test current, and 8.7mcd brightness. This part maintains the same 3mm T-1 form factor and diffused lens type. The higher brightness and current rating require verification that the circuit design can accommodate these parameters. REACH Affected status should be evaluated against supply chain requirements.

3YD-F (Bivar Inc.) operates at 2V with 20mA test current and 20mcd brightness, representing a significant brightness increase. This part is suitable only for applications where higher brightness is acceptable and the circuit can supply the elevated current. The 35° viewing angle is narrower than the main part's 50°.

Not Recommended:

HLMP-1620 and HLMP-1620-C00A1/C00A2 series operate at 5V with 10mA current, representing a fundamental voltage incompatibility with the 1.9V design. These parts are suitable only for 5V indicator circuits and require complete circuit redesign.

HLMP-1621 operates at 12V and is not suitable for low-voltage applications.

Frequently Asked Questions (FAQ)

Q: Can HLMP-1719-A00A1 be used as a direct replacement for HLMP1719MP4B?

A: Yes. HLMP-1719-A00A1 is a direct substitute with identical electrical specifications (1.8V, 2mA, 2.1mcd) and form factor. The 0.1V voltage difference is within acceptable tolerance for indicator circuits. Both parts use the same 3mm T-1 diffused lens with right-angle mounting.

Q: What is the difference between HLMP-1719-A00A1 and HLMP-1719-A00A2?

A: Both parts are electrically identical (1.8V, 2mA, 2.1mcd) and mechanically compatible. The primary difference is packaging: HLMP-1719-A00A1 is supplied in Bulk packaging, while HLMP-1719-A00A2 is supplied in Bulk with higher inventory availability (14,100 units vs. 801 units). Both are suitable for direct replacement.

Q: Can LTL-4251 replace HLMP1719MP4B without circuit modification?

A: LTL-4251 is electrically compatible but operates at higher specifications: 2.1V forward voltage, 10mA test current, and 8.7mcd brightness compared to the original 1.9V, 2mA, 2.1mcd. The circuit must be reviewed to confirm it can supply the higher current and tolerate the increased brightness. The 40° viewing angle is also narrower than the original 50°.

Q: Why are HLMP-1620 and HLMP-1621 not suitable substitutes?

A: These parts operate at 5V and 12V respectively, compared to the HLMP1719MP4B's 1.9V rating. They are designed for different voltage classes and require complete circuit redesign. They are not compatible with low-voltage indicator applications.

Q: What is the significance of the "Right Angle" mounting designation?

A: Right-angle mounting indicates the LED leads are bent 90 degrees, allowing the LED to mount parallel to the circuit board surface. This is distinct from standard radial mounting where leads extend perpendicular to the board. Substitutes must maintain this mounting style for mechanical compatibility with existing PCB layouts.

Q: Are all substitute parts RoHS3 compliant?

A: All active substitute parts listed (HLMP-1719-A00A1, HLMP-1719-A00A2, HLMP-1719, HLMP-1719-A0002, 3YD-F, HLMP-1620 series, HLMP-1621, and LTL-4251) are ROHS3 compliant. The original HLMP1719MP4B RoHS status is not specified in the provided data.

Q: What does "REACH Affected" mean for LTL-4251?

A: REACH Affected indicates the part may contain substances of concern under the REACH regulation. This requires evaluation against your supply chain and regulatory requirements. REACH Unaffected parts (Broadcom and onsemi products) do not carry this restriction.

Q: Can I use HLMP-1719 (standard radial) instead of HLMP1719MP4B (right-angle)?

A: HLMP-1719 is electrically identical but uses standard radial mounting instead of right-angle mounting. This is a mechanical incompatibility. The part cannot be used as a direct replacement in existing PCB layouts designed for right-angle mounting. It is suitable only for new designs or PCB redesigns that accommodate radial mounting.

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