LN377GPX Equivalent & Substitute Parts

Part Overview

The Panasonic LN377GPX is a green diffused 3mm round through-hole LED with a forward voltage of 2.2V and 5mcd brightness rating. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part operates at 20mA test current and features a 565nm peak wavelength with diffused lens transparency for wide-angle light distribution.

Key Parameters

Parameter	LN377GPX Value
Manufacturer	Panasonic Electronic Components
Color	Green
Lens Transparency	Diffused
Lens Size	3.00mm Dia
Voltage - Forward (Vf) (Typ)	2.2V
Current - Test	20mA
Millicandela Rating	5mcd
Wavelength - Peak	565nm
Mounting Type	Through Hole
Package / Case	Radial
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LN377GPX is determined by the following critical parameters:

Primary Compatibility Criteria:

Color: Green (wavelength range 560-575nm acceptable)
Lens Transparency: Diffused
Lens Size: 3.00mm diameter
Mounting Type: Through Hole, Radial configuration
Voltage - Forward (Vf): 2.0V to 2.2V range
Current - Test: 10mA to 20mA range
Moisture Sensitivity Level: MSL 1 (Unlimited)

Secondary Considerations:

Millicandela Rating: 4mcd to 50mcd (brightness variations acceptable based on application requirements)
Lens Style: Round with flat or domed top acceptable
Height: Maximum 6.35mm acceptable for through-hole applications
Product Status: Active preferred for long-term availability

Substitute parts are grouped into two categories: direct green LED replacements with matching voltage specifications (151031VS06000, 3GD-F, 3GDL-F, HLMP-1503-D00FG, HLMP-1790) and alternative green wavelength options (264-7SYGD/S530-E2 for yellow-green applications). High-voltage variants (HLMP-1640, HLMP-1641) and right-angle configurations (HLMP-1640-B00A1, HLMP-1640-B00A2) serve different circuit requirements but maintain core green LED functionality.

Parameter Comparison

Part Number	Manufacturer	Color	Vf (Typ)	Current - Test	mcd Rating	Wavelength - Peak	Lens Size	Lens Style	Height (Max)	Product Status	RoHS Status
LN377GPX	Panasonic	Green	2.2V	20mA	5mcd	565nm	3.00mm	Round with Flat Top	4.00mm	Obsolete	-
151031VS06000	Würth Elektronik	Green	2.2V	20mA	30mcd	560nm	3.00mm	Round with Domed Top	5.55mm	Active	ROHS3 Compliant
264-7SYGD/S530-E2	Everlight Electronics	Yellow-Green	2.0V	20mA	50mcd	575nm	2.90mm	Round with Domed Top	6.20mm	Active	ROHS3 Compliant
3GD-F	Bivar Inc.	Green	2.1V	20mA	25mcd	568nm	3mm, T-1	Round with Domed Top	5.30mm	Active	ROHS3 Compliant
3GDL-F	Bivar Inc.	Green	2.1V	2mA	4mcd	568nm	3mm, T-1	Round with Domed Top	5.30mm	Active	ROHS3 Compliant
HLMP-1503-D00FG	Broadcom Limited	Green	2.1V	10mA	4.2mcd	565nm	3mm, T-1	Round with Domed Top	6.35mm	Active	ROHS3 Compliant
HLMP-1640	Broadcom Limited	Green	5V	10mA	1.6mcd	565nm	3mm, T-1	Round with Domed Top	6.35mm	Active	ROHS3 Compliant
HLMP-1640-B00A1	Broadcom Limited	Green	5V	10mA	1.6mcd	565nm	3mm, T-1	Round with Domed Top	-	Active	ROHS3 Compliant
HLMP-1640-B00A2	Broadcom Limited	Green	5V	10mA	1.6mcd	565nm	3mm, T-1	Round with Domed Top	-	Active	ROHS3 Compliant
HLMP-1641	Broadcom Limited	Green	12V	13mA	1.6mcd	565nm	3mm, T-1	Round with Domed Top	6.35mm	Active	ROHS3 Compliant
HLMP-1790	Broadcom Limited	Green	1.9V	2mA	2.3mcd	565nm	3mm, T-1	Round with Domed Top	6.35mm	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Substitutes (2.0V to 2.2V Forward Voltage Range):

The 151031VS06000 from Würth Elektronik provides the closest electrical match with identical 2.2V forward voltage and 20mA test current. This part is ROHS3 compliant and active in production, ensuring long-term availability. The increased brightness (30mcd versus 5mcd) is acceptable for applications where higher luminous intensity is beneficial.

The 3GD-F and 3GDL-F from Bivar Inc. operate at 2.1V forward voltage within acceptable tolerance. Both are ROHS3 compliant and active. The 3GD-F maintains 20mA test current matching the original specification, while 3GDL-F operates at reduced current (2mA) for low-power applications.

The HLMP-1503-D00FG from Broadcom Limited operates at 2.1V with 10mA test current and is ROHS3 compliant. This part is listed as a direct substitute in the original LN377GPX documentation.

Alternative Wavelength Option:

The 264-7SYGD/S530-E2 from Everlight Electronics provides yellow-green indication (573nm dominant wavelength) as an alternative for applications where color shift is acceptable. Forward voltage is 2.0V with 20mA test current and ROHS3 compliance.

High-Voltage Variants (Not Direct Substitutes):

The HLMP-1640, HLMP-1640-B00A1, HLMP-1640-B00A2, and HLMP-1641 operate at 5V and 12V respectively and are suitable only for circuits designed for higher voltage operation. These are ROHS3 compliant and active in production.

Low-Voltage Option:

The HLMP-1790 operates at 1.9V forward voltage with 2mA test current, suitable for ultra-low-power applications. ROHS3 compliant and active in production.

All recommended substitutes maintain MSL 1 (Unlimited) moisture sensitivity rating and through-hole radial mounting configuration. All active-status parts ensure compliance with current environmental regulations and long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can I use HLMP-1640 as a direct replacement for LN377GPX?

A: No. The HLMP-1640 operates at 5V forward voltage compared to the LN377GPX 2.2V specification. Use only if your circuit is designed for 5V LED operation. For 2.0V to 2.2V circuits, select 151031VS06000, 3GD-F, or HLMP-1503-D00FG.

Q: What is the difference between 3GD-F and 3GDL-F?

A: Both are Bivar green diffused LEDs with identical 2.1V forward voltage and 3mm T-1 package. The 3GD-F operates at 20mA test current with 25mcd brightness, while 3GDL-F operates at 2mA test current with 4mcd brightness. Select 3GD-F for standard applications and 3GDL-F for low-power circuits.

Q: Is 264-7SYGD/S530-E2 compatible with LN377GPX?

A: Electrically compatible (2.0V forward voltage, 20mA test current, through-hole radial mount), but the color is yellow-green (573nm) instead of pure green (565nm). Use only if your application accepts yellow-green indication.

Q: Why is the LN377GPX obsolete?

A: The LN377GPX is classified as obsolete by Panasonic. Active substitutes from Würth Elektronik, Bivar Inc., Broadcom Limited, and Everlight Electronics provide equivalent or superior performance with guaranteed long-term availability and ROHS3 compliance.

Q: Can I use HLMP-1503-D00FG in place of LN377GPX?

A: Yes. The HLMP-1503-D00FG operates at 2.1V forward voltage (within 0.1V tolerance of 2.2V), maintains through-hole radial mounting, and is ROHS3 compliant. Test current is 10mA versus 20mA original specification. Brightness is 4.2mcd versus 5mcd, representing a negligible difference for indication applications.

Q: What is the viewing angle difference between substitutes?

A: The LN377GPX viewing angle is not specified. Substitute parts range from 35° (3GD-F, 3GDL-F) to 120° (HLMP-1640-B00A1). Wider viewing angles provide better visibility from off-axis positions. Select based on your circuit board layout and visibility requirements.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed are ROHS3 compliant. The original LN377GPX RoHS status is not specified due to its obsolete classification. All substitutes meet current environmental regulations.

Q: What is the height difference between LN377GPX and substitutes?

A: The LN377GPX maximum height is 4.00mm. Substitute parts range from 5.30mm to 6.35mm. Verify clearance in your PCB layout before selection. Height differences are due to domed lens design in modern substitutes versus the flat-top lens of the original part.

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