LTL1CHCBK4 Equivalent & Substitute Parts

Part Overview

The LTL1CHCBK4 is a blue 470nm LED indication component manufactured by Lite-On Inc., designed for through-hole mounting applications. This part features a 3.10mm round domed lens with a forward voltage of 3.7V and a brightness rating of 400mcd at 20mA test current. The product is currently classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and component procurement.

Substiute Parts

LTL1CHCBK4

Lite-On Inc.In Stock: 1066LTL1CHCBK4 Datasheet

Current PartRFQ

LTL1CHTBK4

Lite-On Inc.In Stock: 13627LTL1CHTBK4 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The LTL1CHTBK4 qualifies as a direct substitute for the LTL1CHCBK4 based on the following alignment of critical parameters:

• Color and Wavelength: Both parts emit blue light at 470nm dominant wavelength (468nm peak), ensuring identical optical characteristics for indication applications
• Lens Configuration: Identical 3.10mm diameter round domed lens with clear transparency
• Mounting and Package: Both use through-hole radial mounting with matching mechanical dimensions (5.20mm maximum height)
• Test Current: Both specified at 20mA test current
• Viewing Angle: Both maintain 30° viewing angle
• Moisture Sensitivity: Both rated MSL 1 (Unlimited)

The LTL1CHTBK4 differs in forward voltage (3.5V vs. 3.7V) and brightness rating (680mcd vs. 400mcd), representing an improved performance variant within the same product family.

Parameter Comparison

Engineering Selection Recommendations

The LTL1CHTBK4 is the designated manufacturer substitute for the obsolete LTL1CHCBK4. Selection of the LTL1CHTBK4 is supported by:

• Product Status: The substitute is active and in production, ensuring long-term availability and supply chain continuity
• Regulatory Compliance: The LTL1CHTBK4 carries ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements
• Optical Compatibility: Identical wavelength specifications (470nm dominant, 468nm peak) and lens configuration ensure drop-in replacement capability for indication applications
• Mechanical Compatibility: Matching through-hole radial package, lens dimensions, and maximum height enable direct PCB layout compatibility
• Performance Enhancement: The substitute provides higher brightness (680mcd vs. 400mcd) and lower forward voltage (3.5V vs. 3.7V), representing an improved variant

Frequently Asked Questions (FAQ)

Q: Can the LTL1CHTBK4 be used as a direct replacement for the LTL1CHCBK4 in existing designs?

A: Yes. Both parts share identical optical wavelengths (470nm), lens configuration (3.10mm round domed clear), mounting type (through-hole radial), and mechanical dimensions (5.20mm maximum height). The substitute is mechanically and optically compatible for PCB layouts designed for the original part.

Q: What are the differences between these two parts?

A: The LTL1CHTBK4 differs in forward voltage (3.5V vs. 3.7V) and brightness rating (680mcd vs. 400mcd). These represent performance improvements in the substitute part. Circuit designs must account for the lower forward voltage when selecting current-limiting resistor values.

Q: Why is the LTL1CHCBK4 listed as obsolete?

A: The LTL1CHCBK4 has been discontinued by the manufacturer. The LTL1CHTBK4 is the active production equivalent, ensuring continued availability and regulatory compliance for new and ongoing applications.

Q: Are there packaging differences between these parts?

A: The LTL1CHCBK4 is supplied in standard packaging, while the LTL1CHTBK4 is supplied in bulk packaging. Both use identical radial through-hole package configuration.

Q: Does the LTL1CHTBK4 meet current environmental standards?

A: Yes. The LTL1CHTBK4 is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: How should the forward voltage difference affect circuit design?

A: The LTL1CHTBK4 operates at 3.5V compared to the original 3.7V. When substituting, recalculate current-limiting resistor values based on the new forward voltage to maintain desired LED current at 20mA test condition.