LTW-1KHC5 Equivalent & Substitute Parts

Part Overview

The LTW-1KHC5 is a white LED indication component manufactured by Lite-On Inc., designed for through-hole mounting applications. This part features a clear, domed lens with a 3.80mm diameter and delivers 520 millicandela at 3.5V forward voltage with 20mA test current. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, maintenance, and new design implementations where this component specification remains applicable.

Substiute Parts

LTW-1KHC5

Lite-On Inc.In Stock: 994LTW-1KHC5 Datasheet

Current PartRFQ

LTW-420DS4

Lite-On Inc.In Stock: 868LTW-420DS4 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LTW-1KHC5 are identified based on the following critical parameters that define functional equivalence:

• Color and Lens Transparency: White color with clear lens transparency
• Mounting Type: Through-hole radial configuration
• Electrical Compatibility: Forward voltage within acceptable operating range (3.2V–3.5V) and 20mA test current
• Optical Performance: Millicandela rating and viewing angle suitable for indication applications
• Physical Dimensions: Lens size and overall height compatible with PCB layout constraints
• Product Availability: Active status with current manufacturing and inventory support

The LTW-420DS4 qualifies as a manufacturer-recommended substitute based on these parameters. While it exhibits differences in specific metrics (higher brightness, narrower viewing angle, smaller lens diameter), these variations remain within acceptable substitution criteria for white LED indication applications.

Parameter Comparison

Engineering Selection Recommendations

The LTW-420DS4 is the manufacturer-recommended substitute for the obsolete LTW-1KHC5. Selection of this alternative is supported by the following factors:

• Product Status: The LTW-420DS4 maintains active manufacturing status with current inventory availability (820 Pcs), ensuring long-term supply chain continuity.
• Compliance: Both parts carry identical Moisture Sensitivity Level (MSL 1 - Unlimited) and share the same ECCN (EAR99) and HTSUS classifications, maintaining regulatory consistency.
• Electrical Compatibility: Forward voltage differential (3.2V vs. 3.5V) and identical test current (20mA) permit direct circuit integration with standard current-limiting resistor adjustment.
• Mechanical Fit: Radial through-hole mounting and comparable height (5.25mm vs. 5.00mm) support PCB layout compatibility with minimal redesign.
• RoHS Compliance: The LTW-420DS4 is ROHS3 compliant, meeting modern environmental and regulatory standards.

Frequently Asked Questions (FAQ)

Q: Can the LTW-420DS4 directly replace the LTW-1KHC5 without circuit modification?

A: Direct replacement requires resistor recalculation due to the 0.3V forward voltage difference (3.2V vs. 3.5V). The same current-limiting resistor value will produce slightly higher LED current with the LTW-420DS4. Recalculate the series resistor using the new Vf specification to maintain design intent.

Q: What is the impact of the higher millicandela rating (2200mcd vs. 520mcd)?

A: The LTW-420DS4 produces approximately 4.2 times greater luminous intensity. In indication applications, this increased brightness may require optical diffusion or reduced drive current to match the original visual appearance. Evaluate application requirements for acceptable brightness levels.

Q: How does the narrower viewing angle (45° vs. 90°) affect application suitability?

A: The 45° viewing angle concentrates light output in a narrower cone compared to the 90° angle of the original part. This is suitable for applications requiring directional indication but may not be appropriate for omnidirectional visibility requirements. Assess viewing geometry for your specific application.

Q: Are the lens size differences (3mm T-1 vs. 3.80mm) significant for PCB layout?

A: The smaller lens diameter (3mm) may affect visual appearance and light distribution characteristics. Physical PCB clearance and aesthetic considerations should be evaluated. The height difference (5.25mm vs. 5.00mm) is minimal and typically accommodated in standard through-hole designs.

Q: What is the relationship between LTW-420DS4 and the listed substitute SLX-LX3054UWC?

A: The SLX-LX3054UWC is identified as an additional substitute option for the LTW-420DS4. Consult the SLX-LX3054UWC specification sheet for detailed parameter comparison and compatibility assessment.

Q: Is the LTW-420DS4 suitable for new designs?

A: Yes. The LTW-420DS4 is an active product with current manufacturing support, RoHS3 compliance, and established supply chain availability, making it appropriate for both legacy system maintenance and new design implementations.