SSL-LX203CSRT Equivalent & Substitute Parts

Part Overview

The SSL-LX203CSRT is a red LED indication component manufactured by Lumex Opto/Components Inc., designed for through-hole mounting applications. This T-2mm ceramic stem LED operates at 1.7V forward voltage with a 10mcd brightness rating and features a clear round domed lens. The product is classified as obsolete, necessitating identification of active equivalent components for ongoing design requirements and production continuity.

Substiute Parts

SSL-LX203CSRT

Lumex Opto/Components Inc.In Stock: 1248SSL-LX203CSRT Datasheet

Current PartRFQ

MT7403A-UR-A

Marktech OptoelectronicsIn Stock: 2757MT7403A-UR-A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SSL-LX203CSRT is determined by the following critical parameters:

Electrical Compatibility: Forward voltage (Vf) and test current must support operation within existing circuit designs. The SSL-LX203CSRT operates at 1.7V typical with 20mA test current.

Optical Characteristics: Color (red), lens transparency (clear), and wavelength (660nm peak) define the visual output and application suitability.

Mechanical Compatibility: Mounting type (through hole), package configuration (radial), and physical dimensions determine PCB integration feasibility.

Environmental & Regulatory Compliance: RoHS and REACH status ensure regulatory alignment for target markets.

The MT7403A-UR-A from Marktech Optoelectronics is identified as a substitute based on shared red color, clear lens transparency, through-hole radial mounting, and compatible wavelength characteristics. However, this substitute exhibits differences in lens size (3.00mm vs 2.00mm), forward voltage (1.9V vs 1.7V), brightness (200mcd vs 10mcd), viewing angle (35° vs 160°), and physical height (6.10mm vs 2.50mm).

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The SSL-LX203CSRT is classified as obsolete. The MT7403A-UR-A is active and available in production quantities (2700 pcs in stock vs 1144 pcs for the original part), supporting long-term supply chain continuity.

Regulatory Compliance: Both components meet RoHS and REACH requirements, with the SSL-LX203CSRT achieving ROHS3 compliance and the MT7403A-UR-A achieving RoHS compliance. Both are classified as EAR99 for export control purposes.

Electrical Parameters: The MT7403A-UR-A operates at 1.9V forward voltage compared to 1.7V for the SSL-LX203CSRT. This 0.2V difference must be evaluated within the context of existing circuit design margins and current-limiting resistor calculations.

Optical and Mechanical Differences: The MT7403A-UR-A features a larger 3.00mm lens diameter versus 2.00mm, increased brightness (200mcd vs 10mcd), narrower viewing angle (35° vs 160°), and greater physical height (6.10mm vs 2.50mm). These differences require assessment for PCB layout compatibility, visual performance requirements, and mechanical clearance constraints.

Moisture Sensitivity: The SSL-LX203CSRT carries MSL 1 (unlimited shelf life), while the MT7403A-UR-A carries MSL 2 (1-year shelf life), affecting storage and handling protocols.

Frequently Asked Questions (FAQ)

Q: Can the MT7403A-UR-A directly replace the SSL-LX203CSRT without circuit modification?

A: Direct replacement requires evaluation of three factors: (1) Forward voltage difference of 0.2V (1.9V vs 1.7V) and its impact on current-limiting resistor calculations, (2) Physical dimensions, particularly the increased height (6.10mm vs 2.50mm) and lens diameter (3.00mm vs 2.00mm) for PCB layout compatibility, and (3) Optical characteristics, including the narrower viewing angle (35° vs 160°) and increased brightness (200mcd vs 10mcd) for application requirements.

Q: What are the key electrical compatibility parameters?

A: Both components operate at 20mA test current and share the same 660nm peak wavelength. The primary electrical difference is the forward voltage: SSL-LX203CSRT at 1.7V and MT7403A-UR-A at 1.9V. Circuit designs must accommodate this voltage differential through resistor recalculation to maintain proper LED current.

Q: Are there mechanical constraints for substitution?

A: Yes. The SSL-LX203CSRT is a compact T-2mm component with 2.50mm maximum height and 2.00mm lens diameter. The MT7403A-UR-A is a larger 3.0mm round component with 6.10mm maximum height. PCB footprints, component spacing, and mechanical clearances must be verified before substitution.

Q: How do the optical characteristics differ?

A: The SSL-LX203CSRT provides a wide 160° viewing angle with 10mcd brightness, suitable for general indication applications. The MT7403A-UR-A provides a narrow 35° viewing angle with 200mcd brightness, suitable for focused indication or applications requiring higher luminous intensity. Application requirements determine which optical profile is appropriate.

Q: What is the impact of different moisture sensitivity levels?

A: The SSL-LX203CSRT carries MSL 1 (unlimited shelf life), while the MT7403A-UR-A carries MSL 2 (1-year shelf life). This affects storage duration, handling procedures, and reflow processing windows. Components with MSL 2 require more stringent moisture control during manufacturing and storage.

Q: Are both components RoHS compliant?

A: Yes. The SSL-LX203CSRT is ROHS3 compliant, and the MT7403A-UR-A is RoHS compliant. Both meet environmental regulatory requirements for their respective markets. Both are classified as EAR99 for export control and carry the same HTSUS code (8541.41.0000).