LN88RPX Orange LED 3mm Round Through-Hole Equivalent & Substitute Parts

Part Overview

The Panasonic LN88RPX is an orange LED indicator in a 3mm round through-hole package, designed for discrete indication applications. This component features a 2.1V forward voltage, 5mcd brightness rating, and a 630nm peak wavelength. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing design support, legacy system maintenance, and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	LN88RPX
Manufacturer	Panasonic Electronic Components
Description	LED ORANGE 3MM ROUND T/H
Color	Orange
Lens Size	3mm, T-1
Lens Style	Round with Domed Top
Voltage - Forward (Vf) (Typ)	2.1V
Current - Test	20mA
Millicandela Rating	5mcd
Wavelength - Peak	630nm
Mounting Type	Through Hole
Package / Case	Radial
Height (Max)	5.70mm
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LN88RPX are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Color: Orange
Lens Size: 3mm, T-1
Mounting Type: Through Hole
Package / Case: Radial
Voltage - Forward (Vf): Within acceptable operating range (1.95V to 2.15V)
Current - Test: 10mA to 20mA
Wavelength - Peak: 600nm to 640nm range
Lens Style: Round with Domed Top
Moisture Sensitivity Level: 1 (Unlimited)

The two qualified substitute parts—Lite-On LTL-4291N and Kingbright WP132XND—meet these criteria while maintaining mechanical and electrical compatibility with the original LN88RPX footprint and circuit requirements.

Parameter Comparison

Parameter	LN88RPX (Panasonic)	LTL-4291N (Lite-On)	WP132XND (Kingbright)
Color	Orange	Orange	Orange
Lens Size	3mm, T-1	3mm, T-1	3mm, T-1
Lens Style	Round with Domed Top	Round with Domed Top	Round with Domed Top
Lens Transparency	—	Diffused	Diffused
Voltage - Forward (Vf) (Typ)	2.1V	2V	2.05V
Current - Test	20mA	10mA	20mA
Millicandela Rating	5mcd	8.7mcd	16mcd
Wavelength - Peak	630nm	630nm	607nm
Wavelength - Dominant	—	621nm	602nm
Viewing Angle	—	60°	60°
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial
Height (Max)	5.70mm	6.00mm	5.20mm
Product Status	Obsolete	Active	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LTL-4291N (Lite-On Inc.) is an active product with ROHS3 compliance. This substitute operates at 2V forward voltage with a 10mA test current, providing 8.7mcd brightness. The diffused lens transparency and 60° viewing angle offer enhanced light distribution compared to the original part. Height specification of 6.00mm represents a 0.30mm increase over the LN88RPX; verify PCB clearance in applications with height constraints.

WP132XND (Kingbright) is an active product with ROHS3 compliance and REACH Unaffected status. This substitute operates at 2.05V forward voltage with a 20mA test current, matching the original part's current specification. The 16mcd brightness rating provides increased luminous intensity. Height specification of 5.20mm is 0.50mm lower than the original, offering improved fit in space-constrained applications. Peak wavelength of 607nm represents a 23nm shift from the original 630nm specification.

Both substitutes maintain radial through-hole mounting compatibility, 3mm T-1 lens size, and unlimited moisture sensitivity rating. Selection between these options depends on specific brightness requirements, available PCB height, and wavelength tolerance in the application circuit.

Frequently Asked Questions (FAQ)

Q: Can LTL-4291N and WP132XND be used interchangeably with LN88RPX?

A: Both parts meet the primary substitution criteria for color, lens size, mounting type, and package configuration. However, they differ in brightness (8.7mcd and 16mcd respectively versus 5mcd), forward voltage (2V and 2.05V versus 2.1V), and height. Circuit design must accommodate these electrical variations, and PCB layout must verify height clearance.

Q: What is the significance of the diffused lens transparency in the substitute parts?

A: The LTL-4291N and WP132XND feature diffused lenses, which scatter light over a wider area compared to the original part's unspecified lens transparency. This affects light distribution patterns and perceived brightness in the application. Verify that the 60° viewing angle and diffused characteristics are acceptable for the intended indication function.

Q: How do the brightness ratings compare?

A: The LN88RPX is rated at 5mcd. The LTL-4291N provides 8.7mcd (1.74× brighter), and the WP132XND provides 16mcd (3.2× brighter). Applications requiring specific brightness levels must account for these differences in circuit design and user perception.

Q: Are there height considerations for PCB layout?

A: Yes. The LN88RPX maximum height is 5.70mm. The LTL-4291N is 6.00mm (0.30mm taller), and the WP132XND is 5.20mm (0.50mm shorter). Verify clearance above and below the PCB for the selected substitute, particularly in applications with restricted vertical space.

Q: What is the wavelength difference between the substitutes and the original part?

A: The LN88RPX has a 630nm peak wavelength. The LTL-4291N maintains 630nm peak wavelength with 621nm dominant wavelength. The WP132XND has a 607nm peak wavelength and 602nm dominant wavelength, representing a 23nm shift toward the yellow-orange spectrum. Applications sensitive to color perception or optical filtering must evaluate this difference.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both LTL-4291N and WP132XND are ROHS3 compliant. The original LN88RPX RoHS status is not specified in the available data.

Q: What is the REACH status of these parts?

A: The WP132XND is listed as REACH Unaffected. The LTL-4291N and LN88RPX REACH status is not specified in the available data.

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