SSL-LX203CIT Equivalent & Substitute Parts

Part Overview

The SSL-LX203CIT is a red LED indication component manufactured by Lumex Opto/Components Inc., designed for through-hole mounting applications. This part is classified as obsolete, necessitating identification of equivalent substitute components for ongoing design requirements and procurement needs. The SSL-LX203CIT operates at 2V forward voltage with a 6mcd brightness rating and features a 2.00mm diameter clear lens with a 160° viewing angle, making it suitable for general indication applications requiring wide-angle visibility.

Substiute Parts

SSL-LX203CIT

Lumex Opto/Components Inc.In Stock: 1189SSL-LX203CIT Datasheet

Current PartRFQ

MT7403A-UR-A

Marktech OptoelectronicsIn Stock: 2757MT7403A-UR-A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SSL-LX203CIT is determined by the following critical parameters:

Primary Compatibility Criteria:

• Color: Red
• Lens Transparency: Clear
• Mounting Type: Through Hole
• Package Configuration: Radial
• Operating Current: 20mA test condition

Secondary Compatibility Parameters:

• Forward Voltage (Vf): Range tolerance of ±0.2V acceptable for series resistor adjustment
• Wavelength - Peak: Red spectrum range (630nm–660nm)
• Millicandela Rating: Application-dependent brightness requirements
• Viewing Angle: Application-dependent visibility requirements
• Physical dimensions: PCB layout constraints

The MT7403A-UR-A from Marktech Optoelectronics meets the primary compatibility criteria as a red, clear-lens, through-hole radial LED. However, secondary parameters differ significantly, requiring engineering evaluation for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The MT7403A-UR-A is electrically compatible with the SSL-LX203CIT for basic red LED indication applications, as both components operate at similar forward voltages (2V vs. 1.9V) and test currents (20mA). Both components are RoHS compliant and REACH unaffected, meeting regulatory requirements.

Critical Differences Requiring Evaluation:

1. Physical Dimensions: The MT7403A-UR-A has a 3.00mm lens diameter and 6.10mm maximum height, compared to the SSL-LX203CIT's 2.00mm lens and 2.50mm height. PCB layout and mechanical clearance must be verified.

2. Brightness: The MT7403A-UR-A provides 200mcd versus 6mcd for the SSL-LX203CIT. Applications requiring low brightness indication may require series resistor adjustment to prevent over-illumination.

3. Viewing Angle: The MT7403A-UR-A has a 35° viewing angle versus 160° for the SSL-LX203CIT. Applications requiring wide-angle visibility are not suitable for this substitute without optical redesign.

4. Product Status: The MT7403A-UR-A is active and in stock (2700 pcs), ensuring long-term availability compared to the obsolete SSL-LX203CIT.

5. Moisture Sensitivity: The MT7403A-UR-A has MSL 2 (1 Year) versus MSL 1 (Unlimited) for the SSL-LX203CIT, affecting storage and handling requirements.

Recommendation: Substitution is viable only for applications where the larger physical size, higher brightness, narrower viewing angle, and increased moisture sensitivity are acceptable. Applications requiring the original 160° viewing angle or compact 2.00mm form factor require alternative component selection.

Frequently Asked Questions (FAQ)

Q: Can the MT7403A-UR-A directly replace the SSL-LX203CIT without circuit modifications?

A: Electrical substitution is possible due to similar forward voltages (1.9V vs. 2V) and test currents (20mA). However, the significantly higher brightness (200mcd vs. 6mcd) typically requires series resistor adjustment to match the original indication intensity. Physical dimensions differ substantially, requiring PCB layout verification.

Q: What are the key differences in viewing angle between these components?

A: The SSL-LX203CIT provides a 160° viewing angle suitable for applications requiring wide-angle visibility. The MT7403A-UR-A has a 35° viewing angle, restricting visibility to a narrow cone. Applications requiring wide-angle indication are not compatible with this substitute.

Q: Are there packaging or handling differences?

A: The MT7403A-UR-A has Moisture Sensitivity Level 2 (1 Year) compared to MSL 1 (Unlimited) for the SSL-LX203CIT. This requires stricter storage conditions and shorter shelf life management. Both components use radial through-hole packaging.

Q: What is the wavelength difference between these red LEDs?

A: The SSL-LX203CIT has a peak wavelength of 635nm, while the MT7403A-UR-A is 660nm. Both fall within the red spectrum range. The MT7403A-UR-A has a dominant wavelength of 643nm. This difference may be perceptible in color-critical applications.

Q: Is the MT7403A-UR-A suitable for space-constrained designs?

A: No. The MT7403A-UR-A is larger (3.00mm lens, 6.10mm height) than the SSL-LX203CIT (2.00mm lens, 2.50mm height). Applications with strict PCB height or diameter constraints require alternative components.

Q: What compliance certifications apply to both components?

A: Both components are RoHS compliant and REACH unaffected. The SSL-LX203CIT is ROHS3 compliant, while the MT7403A-UR-A is RoHS compliant. Both have ECCN EAR99 and HTSUS 8541.41.0000 classifications.