LTL2P3KYK Equivalent & Substitute Parts

Part Overview

The LTL2P3KYK is an amber LED indicator manufactured by Lite-On Inc., designed for through-hole applications in discrete indication circuits. This component features a 5mm T-1 3/4 lens with a clear, domed top configuration and operates at a forward voltage of 2.05V with a 1000mcd brightness rating at 20mA test current. The product is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and production requirements.

Substiute Parts

LTL2P3KYK

Lite-On Inc.In Stock: 727LTL2P3KYK Datasheet

Current PartRFQ

SLI-560YT3F

Rohm SemiconductorIn Stock: 2573SLI-560YT3F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LTL2P3KYK is determined by the following critical parameters:

• Lens Size & Mounting: T-1 3/4 (5mm) through-hole radial package ensures mechanical and electrical compatibility with existing PCB layouts
• Lens Configuration: Round domed top with clear transparency maintains optical performance and visual consistency
• Electrical Characteristics: Forward voltage (Vf), test current (20mA), and brightness rating (1000mcd) define functional equivalence
• Wavelength Range: Dominant wavelength determines color perception; amber (592nm) and yellow (591nm) occupy adjacent spectral regions

The substitute part SLI-560YT3F from Rohm Semiconductor shares the same mechanical form factor (T-1 3/4 through-hole radial) and optical configuration (clear domed lens). While the color shifts from amber to yellow due to a 1nm difference in dominant wavelength, both components operate within the same brightness class (1000mcd) and mounting architecture. The forward voltage differential (2.05V vs. 1.9V) and expanded viewing angle (40° vs. 22°) represent measurable parameter variations that must be evaluated against circuit design requirements.

Parameter Comparison

Engineering Selection Recommendations

The SLI-560YT3F represents an active production alternative to the obsolete LTL2P3KYK. Both components share identical mechanical form factors (T-1 3/4 through-hole radial) and optical configurations (clear domed lens), enabling direct PCB footprint compatibility.

Key considerations for component selection:

• Product Status: The SLI-560YT3F is in active production status, ensuring long-term availability and supply chain stability compared to the obsolete LTL2P3KYK
• Compliance: The SLI-560YT3F carries ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements
• Electrical Parameters: The forward voltage reduction from 2.05V to 1.9V requires circuit-level evaluation to confirm compatibility with existing current-limiting resistor designs
• Optical Characteristics: The viewing angle expansion from 22° to 40° provides enhanced visibility but represents a functional change that may affect application-specific requirements
• Color Shift: The wavelength change from amber (592nm) to yellow (591nm) introduces a perceptible color difference that must be assessed against human-machine interface specifications

Frequently Asked Questions (FAQ)

Q: Can the SLI-560YT3F be used as a direct drop-in replacement for the LTL2P3KYK?

A: Mechanical compatibility is confirmed; both components use identical T-1 3/4 through-hole radial packages with clear domed lenses. However, the forward voltage differential (2.05V vs. 1.9V) and color shift (amber to yellow) require circuit validation before implementation.

Q: What is the impact of the 0.15V forward voltage difference?

A: The SLI-560YT3F operates at 1.9V compared to the LTL2P3KYK at 2.05V. This affects current-limiting resistor calculations and power dissipation. Existing resistor values must be re-evaluated to maintain the 20mA test current specification.

Q: Does the expanded viewing angle (40° vs. 22°) affect compatibility?

A: The SLI-560YT3F provides a wider viewing angle, which increases visibility but represents a functional change. Applications requiring narrow-angle indication may experience unintended visibility in adjacent areas.

Q: Are there packaging or moisture sensitivity concerns?

A: The LTL2P3KYK carries MSL 1 (Unlimited) rating, while the SLI-560YT3F lists MSL as Not Applicable. Both are suitable for standard through-hole assembly processes without special moisture handling requirements.

Q: What compliance certifications apply to the substitute part?

A: The SLI-560YT3F is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards. Both components share the same ECCN (EAR99) and HTSUS (8541.41.0000) classifications.