QL202IT Red LED T-1 Through Hole - Equivalent & Substitute Parts

Part Overview

The QL202IT is a red LED indicator from onsemi designed for through-hole mounting applications. It features a 3mm T-1 package with a clear domed lens and operates at 1.7V forward voltage with a 17mcd brightness rating. The product is currently obsolete, making equivalent substitutes necessary for ongoing production, maintenance, and repair applications. Substitute parts must maintain compatibility with the original mechanical form factor, electrical characteristics, and mounting requirements while meeting current compliance standards.

Substiute Parts

QL202IT

onsemiIn Stock: 1180QL202IT Datasheet

Current PartRFQ

HLMP-Y301-F0000

Broadcom LimitedIn Stock: 50286HLMP-Y301-F0000 Datasheet

SimilarRFQ

LTL-1CHEE

Lite-On Inc.In Stock: 57089LTL-1CHEE Datasheet

SimilarRFQ

LTL1CHJETNN

Lite-On Inc.In Stock: 826LTL1CHJETNN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the QL202IT is determined by the following critical parameters:

Mechanical Compatibility: Package type (Radial), lens size (3mm T-1), mounting type (Through Hole), and maximum height (5.20mm) must match or be compatible with the original design.

Optical Characteristics: Color (Red), lens transparency (Clear), and lens style (Round with Domed Top) must be identical to maintain visual consistency in indicator applications.

Electrical Parameters: Forward voltage (Vf), test current, and brightness (millicandela rating) determine circuit compatibility. Substitutes with higher Vf or different test currents may require circuit adjustments but remain functionally viable if the application can accommodate the variation.

Compliance Status: While the original part is RoHS non-compliant and obsolete, active substitute parts with RoHS3 compliance are preferred for new designs and ongoing production to meet current regulatory requirements.

All three substitute parts meet the mechanical and optical requirements. Electrical parameters vary within acceptable ranges for LED indicator applications.

Parameter Comparison

Engineering Selection Recommendations

HLMP-Y301-F0000 (Broadcom Limited): This part is the closest electrical match with a 2.1V forward voltage and 19mcd brightness. It maintains identical mechanical dimensions and optical properties. The part is in active production status with ROHS3 compliance and REACH unaffected status, making it suitable for new designs and long-term availability. Higher test current (20mA vs. 10mA) requires circuit verification but is standard for modern LED indicator designs.

LTL-1CHEE (Lite-On Inc.): This substitute offers a 2V forward voltage and 19mcd brightness with active product status and ROHS3 compliance. The lens size specification (3.10mm Dia) represents a minor mechanical variation from the standard 3mm T-1 package but remains compatible with typical through-hole PCB layouts. REACH affected status indicates substance of concern presence; verify compliance requirements for your application jurisdiction.

LTL1CHJETNN (Lite-On Inc.): This part provides significantly higher brightness (180mcd) compared to the original 17mcd, making it suitable for applications requiring enhanced visibility. Forward voltage (2.05V) and test current (20mA) are within acceptable ranges. ROHS3 compliance and active status support long-term supply. Select this option only if increased brightness is acceptable or beneficial for the application.

All three substitutes are mechanically and optically compatible with the QL202IT. Selection depends on brightness requirements, circuit design tolerance for higher forward voltage, and compliance certification needs.

Frequently Asked Questions (FAQ)

Q: Can I directly replace QL202IT with any of these substitutes without circuit modification?

A: Mechanical and optical replacement is direct. Electrical compatibility depends on circuit design. The original part operates at 1.7V with 10mA test current, while all substitutes operate at approximately 2V with 20mA test current. If your circuit uses a current-limiting resistor, verify the resistor value accommodates the higher forward voltage. Most indicator circuits tolerate this variation without modification.

Q: What is the difference between the three substitute options?

A: HLMP-Y301-F0000 and LTL-1CHEE offer similar brightness (19mcd) and are interchangeable for most applications. LTL1CHJETNN provides 180mcd brightness, approximately 10 times brighter, for applications requiring enhanced visibility. All three maintain the 3mm T-1 form factor and through-hole mounting compatibility.

Q: Does the lens size variation in LTL-1CHEE (3.10mm Dia vs. 3mm T-1) affect compatibility?

A: The 3.10mm diameter specification represents a minor dimensional variation within typical manufacturing tolerances for T-1 packages. It remains compatible with standard through-hole PCB layouts designed for 3mm LEDs. Verify clearance in your specific PCB design if space constraints exist.

Q: Why do the substitutes have higher test currents (20mA vs. 10mA)?

A: Test current specifications reflect modern LED design standards. Higher test current does not require higher operating current in your circuit; it is the specification condition under which brightness is measured. Your circuit's actual operating current is determined by the series resistor value, independent of the test current specification.

Q: Which substitute should I choose for new production?

A: HLMP-Y301-F0000 is recommended for new production due to active status, ROHS3 compliance, REACH unaffected status, and closest electrical match to the original design. LTL-1CHEE is a secondary option with similar characteristics but REACH affected status. LTL1CHJETNN is suitable if increased brightness is required.

Q: Are there any compliance concerns with these substitutes?

A: All three substitutes are ROHS3 compliant, meeting current regulatory requirements. LTL-1CHEE carries REACH affected status, indicating presence of substances of concern; verify compliance with your application's regulatory jurisdiction. HLMP-Y301-F0000 and LTL1CHJETNN have no REACH restrictions noted.