LN28RP Equivalent & Substitute Parts

Part Overview

The LN28RP is a red diffused 3mm through-hole LED manufactured by Panasonic Electronic Components, designed for red indication applications in discrete electronic circuits. This component operates at a forward voltage of 2.2V with a test current of 15mA and produces 0.8mcd of luminous intensity. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing maintenance, repair, and redesign applications where this component is specified in legacy designs.

Substiute Parts

LN28RP

Panasonic Electronic ComponentsIn Stock: 1149LN28RP Datasheet

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LTL-4211

Lite-On Inc.In Stock: 12366LTL-4211 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LN28RP is determined by the following critical parameters that must align with the original component's electrical and mechanical specifications:

Primary Substitution Criteria:

• Color: Red
• Lens Size: 3mm, T-1 form factor
• Lens Transparency: Diffused
• Mounting Type: Through Hole (Radial package)
• Forward Voltage (Vf): Within acceptable operating range (2.1V–2.2V nominal)
• Test Current: Compatible with standard indicator circuit design (10mA–15mA)
• Peak Wavelength: Red spectrum (657nm–700nm)

The LTL-4211 manufactured by Lite-On Inc. meets these substitution criteria. Both components share identical physical form factors (3mm T-1 through-hole radial), operate within compatible voltage and current ranges, and produce red light in the appropriate wavelength band for indicator applications. The LTL-4211 is an active product with modern compliance certifications, making it suitable for replacement in legacy designs.

Parameter Comparison

Engineering Selection Recommendations

The LTL-4211 is the qualified substitute for the obsolete LN28RP based on the following engineering factors:

Electrical Compatibility: The LTL-4211 operates at 2.1V forward voltage compared to the LN28RP's 2.2V, representing a 0.1V difference within acceptable tolerance for indicator circuit design. The test current of 10mA is lower than the original 15mA specification, reducing power dissipation in replacement designs. Both components function within standard red LED indicator circuit parameters.

Physical Compatibility: Both components use identical 3mm T-1 through-hole radial packages with diffused red lenses and domed tops. The LTL-4211 height of 6.55mm exceeds the LN28RP's 5.20mm by 1.35mm; this difference must be evaluated against PCB layout constraints and mechanical clearance requirements in the target application.

Optical Performance: The LTL-4211 produces 2.5mcd compared to the LN28RP's 0.8mcd, providing increased luminous intensity. Peak wavelengths are nearly identical (697nm vs. 700nm), ensuring consistent red color appearance. The LTL-4211's specified 40° viewing angle provides defined optical characteristics for the replacement design.

Product Status and Compliance: The LN28RP is obsolete and RoHS non-compliant. The LTL-4211 is an active product with ROHS3 compliance and REACH compliance status, meeting current regulatory requirements for new designs and manufacturing environments subject to environmental restrictions.

Frequently Asked Questions (FAQ)

Q: Can the LTL-4211 be used as a direct drop-in replacement for the LN28RP?

A: The LTL-4211 is electrically and mechanically compatible for most indicator applications. Both components share the 3mm T-1 through-hole radial package with identical lens configuration. The 1.35mm height difference (LTL-4211 at 6.55mm vs. LN28RP at 5.20mm) must be verified against PCB layout and mechanical clearance in your specific design. Forward voltage and test current differences are within acceptable ranges for standard indicator circuits.

Q: What are the key differences between these two components?

A: The primary differences are: (1) Forward voltage: LTL-4211 at 2.1V vs. LN28RP at 2.2V; (2) Test current: LTL-4211 at 10mA vs. LN28RP at 15mA; (3) Luminous intensity: LTL-4211 at 2.5mcd vs. LN28RP at 0.8mcd; (4) Physical height: LTL-4211 at 6.55mm vs. LN28RP at 5.20mm; (5) Product status: LTL-4211 is active with modern compliance certifications, while LN28RP is obsolete and RoHS non-compliant.

Q: Will the increased brightness of the LTL-4211 (2.5mcd vs. 0.8mcd) affect my circuit design?

A: The higher luminous intensity of the LTL-4211 is a performance enhancement for indicator visibility. If your circuit is designed with current-limiting resistors for the original 0.8mcd specification, the LTL-4211 will appear brighter at the same current level. Circuit redesign is not required for functionality, but resistor values may be adjusted if brightness reduction is desired for aesthetic or power consumption reasons.

Q: Are there any compliance or regulatory considerations when substituting the LN28RP with the LTL-4211?

A: Yes. The LN28RP is RoHS non-compliant, while the LTL-4211 is ROHS3 compliant and REACH affected. If your application or manufacturing environment is subject to RoHS or REACH regulations, the LTL-4211 substitution brings the design into compliance. The LTL-4211 is the appropriate choice for new designs or manufacturing in regulated jurisdictions.

Q: What is the impact of the 0.1V forward voltage difference on circuit design?

A: The 0.1V difference (LTL-4211 at 2.1V vs. LN28RP at 2.2V) is negligible for indicator applications. Standard circuit designs using 5V or higher supply voltages with current-limiting resistors will function identically with both components. The voltage drop across the resistor will increase by approximately 0.1V, which is absorbed within normal design tolerances.

Q: Can I use the LTL-4211 in applications where the LN28RP was originally specified?

A: The LTL-4211 is suitable for applications where the LN28RP was specified, provided that: (1) PCB layout accommodates the 1.35mm height difference; (2) Increased brightness (2.5mcd vs. 0.8mcd) is acceptable or circuit resistors are adjusted; (3) The application does not have specific constraints on forward voltage or test current outside the 2.1V and 10mA specifications. Verify mechanical clearance and optical requirements in your specific design before implementation.