QL202YT LED Yellow Clear T-1 Through Hole - Equivalent & Substitute Parts

Part Overview

The QL202YT is a yellow LED indicator manufactured by onsemi, designed for discrete indication applications in through-hole configurations. This component features a 3mm T-1 form factor with a clear lens and 1.7V forward voltage rating. The product is currently obsolete, making identification of functionally equivalent alternatives essential for ongoing maintenance, repair, and legacy system support. Substitute parts must maintain compatibility with the original electrical specifications and physical mounting requirements while meeting current availability and compliance standards.

Substiute Parts

QL202YT

onsemiIn Stock: 1037QL202YT Datasheet

Current PartRFQ

HLMP-Y402-G0000

Broadcom LimitedIn Stock: 55788HLMP-Y402-G0000 Datasheet

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LTL1CHJSTNN

Lite-On Inc.In Stock: 984LTL1CHJSTNN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the QL202YT are evaluated based on the following critical parameters that determine functional compatibility:

Physical Compatibility:

• Lens size: 3mm, T-1 form factor
• Mounting type: Through hole radial configuration
• Maximum height: 5.20mm

Electrical Compatibility:

• Forward voltage (Vf): Acceptable range determined by circuit design tolerance
• Test current: Operating current capability
• Wavelength characteristics: Peak wavelength in yellow spectrum (580-590nm range)

Optical Compatibility:

• Color: Yellow indication
• Lens transparency: Clear
• Millicandela rating: Brightness level for indication purposes
• Viewing angle: Field of view for visibility

Regulatory & Compliance:

• RoHS compliance status
• Moisture sensitivity level
• REACH and ECCN classifications

The identified substitute parts maintain the core physical form factor (3mm T-1 through-hole radial) and operate within compatible electrical parameters while offering improved product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

HLMP-Y402-G0000 (Broadcom Limited): This substitute maintains identical physical dimensions and through-hole radial configuration. The forward voltage increases from 1.7V to 2.1V, requiring circuit verification to confirm compatibility with existing current-limiting resistor values. The part is currently active in production with ROHS3 compliance certification. Color specification is orange rather than yellow, with peak wavelength at 610nm versus the original 585nm. This substitution is suitable for applications where orange indication is acceptable or where the circuit design accommodates the higher forward voltage.

LTL1CHJSTNN (Lite-On Inc.): This substitute provides yellow color matching with the original QL202YT and maintains the 3mm T-1 through-hole radial form factor. Forward voltage is 2.05V with test current of 20mA. The part is currently active in production with ROHS3 compliance. Peak wavelength at 588nm closely aligns with the original 585nm specification. Millicandela rating of 180mcd significantly exceeds the original 15mcd, providing substantially higher brightness. This substitution is suitable for applications where increased brightness is acceptable or beneficial, and where the circuit design accommodates the higher forward voltage and test current.

Both substitute parts maintain critical physical compatibility and MSL rating. Selection between alternatives depends on color requirement (yellow versus orange), brightness tolerance, and circuit design parameters for forward voltage and current.

Frequently Asked Questions (FAQ)

Q: Can the HLMP-Y402-G0000 be used as a direct replacement for the QL202YT?

A: Physical and mounting compatibility is maintained. However, the HLMP-Y402-G0000 is specified as orange rather than yellow, with peak wavelength at 610nm compared to the original 585nm. Forward voltage increases from 1.7V to 2.1V. Substitution is viable only if the application accepts orange indication and the circuit design accommodates the higher forward voltage through appropriate resistor selection.

Q: What are the key differences between the two substitute parts?

A: The HLMP-Y402-G0000 provides orange indication at 610nm peak wavelength with 29mcd brightness. The LTL1CHJSTNN provides yellow indication at 588nm peak wavelength with 180mcd brightness. Both maintain the 3mm T-1 through-hole radial form factor and 5.20mm maximum height. The LTL1CHJSTNN offers color matching to the original yellow specification and significantly higher brightness output.

Q: Will the higher forward voltage of substitute parts affect circuit operation?

A: Forward voltage increases from 1.7V to approximately 2.0-2.1V in both substitutes. This affects voltage drop across the LED and requires recalculation of series resistor values to maintain desired operating current. Circuit verification is necessary to confirm compatibility with existing power supply and resistor specifications.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both HLMP-Y402-G0000 and LTL1CHJSTNN are ROHS3 compliant, whereas the original QL202YT is RoHS non-compliant. This provides improved environmental and regulatory compliance for new designs or system updates.

Q: What is the impact of the higher millicandela rating in the LTL1CHJSTNN?

A: The LTL1CHJSTNN provides 180mcd brightness compared to the original 15mcd. This 12-fold increase in brightness output may affect visual perception in the application. Substitution is suitable where increased brightness is acceptable or where the application benefits from higher visibility. Circuit design must accommodate the higher test current of 20mA.

Q: Are the physical dimensions identical across all three parts?

A: Yes. All three parts maintain the 3mm T-1 lens size, through-hole radial mounting configuration, and 5.20mm maximum height. Physical board layout and mounting hole spacing remain compatible.