HLMP1790 Green LED T-1 Equivalent & Substitute Parts

Part Overview

The HLMP1790 is a green diffused T-1 through-hole LED manufactured by onsemi, designed for green indication applications in discrete circuit configurations. This part operates at 1.9V forward voltage with a 2mA test current and delivers 2 millicandela brightness. The HLMP1790 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.

Key Parameters

Parameter	HLMP1790 Value
Manufacturer	onsemi
Product Status	Obsolete
Color	Green
Lens Transparency	Diffused
Lens Size	3mm, T-1
Voltage - Forward (Vf) (Typ)	1.9V
Current - Test	2mA
Millicandela Rating	2mcd
Viewing Angle	50°
Mounting Type	Through Hole
Wavelength - Peak	565nm
Package / Case	Radial
Height (Max)	6.30mm
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the HLMP1790 is determined by the following electrical and mechanical parameters:

Primary Compatibility Criteria:

Color: Green
Lens Transparency: Diffused
Lens Size: 3mm, T-1
Mounting Type: Through Hole
Package / Case: Radial
Wavelength - Peak: 565nm region

Secondary Electrical Parameters:

Voltage - Forward (Vf): 1.9V to 2.1V range acceptable for low-voltage applications
Current - Test: 2mA to 20mA range
Millicandela Rating: 2mcd to 25mcd range
Viewing Angle: 35° to 60° range

Substitute parts must maintain the same physical form factor (3mm T-1 radial through-hole) and green diffused lens characteristics. Forward voltage tolerance extends to 2.1V for designs with appropriate current-limiting resistor adjustment. Brightness and viewing angle variations are acceptable within the specified ranges for indication applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Vf (Typ)	Current - Test	mcd	Viewing Angle	Height (Max)	RoHS Status
HLMP1790	onsemi	Obsolete	1.9V	2mA	2	50°	6.30mm	-
3GDL-F	Bivar Inc.	Active	2.1V	2mA	4	35°	5.30mm	ROHS3 Compliant
HLMP-1503-D00FG	Broadcom Limited	Active	2.1V	10mA	4.2	60°	6.35mm	ROHS3 Compliant
HLMP-1640	Broadcom Limited	Active	5V	10mA	1.6	60°	6.35mm	ROHS3 Compliant
HLMP-1641	Broadcom Limited	Active	12V	13mA	1.6	60°	6.35mm	ROHS3 Compliant
HLMP-1790-A0002	Broadcom Limited	Active	1.9V	2mA	2.3	50°	6.35mm	ROHS3 Compliant
LTL-1NHG	Lite-On Inc.	Active	2.1V	20mA	12.6	40°	5.25mm	ROHS3 Compliant
LTL-4231	Lite-On Inc.	Active	2.1V	10mA	12.6	40°	6.55mm	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Minimum Circuit Modification): HLMP-1790-A0002 from Broadcom Limited provides the closest electrical match with identical 1.9V forward voltage and 2mA test current. This part maintains the same brightness level (2.3mcd) and viewing angle (50°) as the original HLMP1790. ROHS3 compliance and active product status ensure long-term availability and regulatory alignment.

Low-Voltage Substitutes (1.9V to 2.1V Range): 3GDL-F (Bivar Inc.) and HLMP-1503-D00FG (Broadcom Limited) operate at 2.1V forward voltage and require circuit resistor recalculation. Both maintain the 3mm T-1 radial form factor and diffused green lens. The 3GDL-F operates at 2mA matching the original test current, while HLMP-1503-D00FG operates at 10mA with higher brightness (4.2mcd). Both are ROHS3 compliant and active products.

Higher-Voltage Substitutes (5V and 12V): HLMP-1640 (5V) and HLMP-1641 (12V) from Broadcom Limited are suitable for designs operating at higher supply voltages. These parts require significant circuit redesign with appropriate current-limiting resistors. Both maintain the 3mm T-1 form factor and are ROHS3 compliant active products.

Higher-Brightness Alternatives: LTL-1NHG and LTL-4231 from Lite-On Inc. deliver 12.6mcd brightness at 2.1V forward voltage, suitable for applications requiring increased visibility. LTL-4231 operates at 10mA test current with ROHS3 compliance and unlimited moisture sensitivity rating.

All substitute parts maintain green color, diffused lens transparency, 3mm T-1 radial through-hole mounting, and 565nm peak wavelength compatibility with the original HLMP1790.

Frequently Asked Questions (FAQ)

Q: Can HLMP-1790-A0002 be used as a direct drop-in replacement for HLMP1790? A: Yes. HLMP-1790-A0002 matches the original 1.9V forward voltage, 2mA test current, and 50° viewing angle. No circuit modifications are required. The only difference is the packaging format (Cut Tape vs. original packaging) and slightly higher brightness (2.3mcd vs. 2mcd).

Q: What circuit changes are needed to substitute 3GDL-F or HLMP-1503-D00FG for HLMP1790? A: Both parts operate at 2.1V forward voltage compared to the original 1.9V. Recalculate the current-limiting resistor using the formula: R = (Vsupply - Vf) / Iled. The 0.2V difference requires proportional resistor adjustment to maintain the same LED current.

Q: Are higher-voltage substitutes (HLMP-1640 at 5V, HLMP-1641 at 12V) compatible with 1.9V circuits? A: No. These parts are designed for higher supply voltages and require complete circuit redesign. They are suitable only for applications with 5V or 12V power supplies respectively.

Q: What is the difference between LTL-1NHG and LTL-4231? A: Both deliver 12.6mcd brightness at 2.1V forward voltage. LTL-1NHG operates at 20mA test current with 5.25mm maximum height. LTL-4231 operates at 10mA test current with 6.55mm maximum height. Selection depends on available circuit current capacity and PCB height constraints.

Q: Are all substitute parts ROHS3 compliant? A: All active substitute parts listed are ROHS3 compliant. The original HLMP1790 (obsolete) does not specify RoHS status.

Q: Can substitute parts with different viewing angles be used interchangeably? A: Viewing angle affects the light distribution pattern. Parts with 35° viewing angle (3GDL-F) provide narrower light distribution compared to 60° parts (HLMP-1503-D00FG, HLMP-1640, HLMP-1641). Selection depends on the specific application's visibility requirements and viewing geometry.

Q: What is the moisture sensitivity difference between MSL 1 and MSL 2A? A: MSL 1 (Unlimited) allows indefinite storage without moisture absorption concerns. MSL 2A (4 Weeks) requires controlled storage conditions and limits shelf life to 4 weeks after packaging opening. LTL-1NHG carries MSL 2A rating, requiring more stringent storage management.

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