QL205GD LED Green Diffused 3MM T-1 Through Hole - Equivalent & Substitute Parts

Part Overview

The QL205GD is a green diffused LED indicator manufactured by onsemi, designed for through-hole mounting in T-1 (3mm) package format. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support, maintenance, and production continuity. The part serves as a discrete radial LED indication element suitable for standard indicator applications requiring green light output.

Substiute Parts

QL205GD

onsemiIn Stock: 911QL205GD Datasheet

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TLHG4605

Vishay Semiconductor Opto DivisionIn Stock: 3503TLHG4605 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the QL205GD is determined by the following critical parameters:

• Package Format: T-1 (3mm) radial through-hole configuration
• Mounting Type: Through-hole PCB mounting
• Color: Green LED indication
• Physical Compatibility: Maximum height and radial lead spacing must accommodate existing PCB layouts
• Electrical Compatibility: Forward voltage and test current characteristics must be compatible with existing circuit designs
• Compliance Status: RoHS and REACH certifications for regulatory requirements

The TLHG4605 from Vishay Semiconductor Opto Division qualifies as a direct substitute based on matching package format, mounting type, color specification, and physical dimensions within acceptable tolerance ranges.

Parameter Comparison

Engineering Selection Recommendations

The TLHG4605 is the designated substitute for the obsolete QL205GD based on the following factors:

Product Status: The QL205GD is obsolete, while the TLHG4605 maintains active production status, ensuring long-term availability and supply chain continuity.

Compliance Certification: The TLHG4605 is ROHS3 compliant, meeting current regulatory requirements for new designs and production environments. The QL205GD is RoHS non-compliant, which may present restrictions in certain manufacturing and distribution contexts.

Physical Compatibility: Both components utilize T-1 (3mm) radial through-hole packages with compatible lead spacing. The TLHG4605 height of 6.10mm exceeds the QL205GD specification of 5.20mm by 0.90mm. This difference must be evaluated against specific PCB layout constraints and clearance requirements.

Electrical Characteristics: The TLHG4605 provides specified electrical parameters (2.4V forward voltage, 10mA test current, 569nm dominant wavelength) that establish a defined operating point for circuit design. The QL205GD lacks published electrical specifications, making the TLHG4605 preferable for new designs requiring documented performance data.

Regulatory Alignment: Both components share identical REACH and ECCN classifications, maintaining regulatory consistency in supply chain documentation.

Frequently Asked Questions (FAQ)

Q: Can the TLHG4605 be used as a direct replacement for the QL205GD in existing PCB designs?

A: The TLHG4605 is mechanically and electrically compatible for most applications. The 0.90mm height difference must be verified against PCB layout clearances, component density, and any height-restricted mounting areas. Lead spacing and radial package geometry are compatible.

Q: What is the significance of the RoHS compliance difference between these parts?

A: The QL205GD is RoHS non-compliant, while the TLHG4605 is ROHS3 compliant. This distinction affects manufacturing facility requirements, supply chain restrictions, and regulatory compliance for products sold in regions with RoHS mandates. New designs should prioritize RoHS-compliant components.

Q: Are the electrical characteristics of the TLHG4605 suitable for circuits designed for the QL205GD?

A: The TLHG4605 operates at 2.4V forward voltage with a 10mA test current. Since the QL205GD specifications are not published, circuit compatibility must be evaluated based on the existing design's voltage supply and current-limiting resistor values. The TLHG4605 specifications provide a defined operating point for circuit validation.

Q: What packaging options are available for the TLHG4605?

A: The TLHG4605 is supplied in bulk packaging. The QL205GD packaging format is not specified in available documentation.

Q: Are there any moisture sensitivity considerations for long-term storage?

A: Both the QL205GD and TLHG4605 carry MSL 1 (Unlimited) ratings, indicating no moisture sensitivity restrictions for storage or handling. Standard component storage practices apply.

Q: How do the wavelength specifications compare?

A: The TLHG4605 specifies a dominant wavelength of 569nm (peak 565nm), establishing a defined green light output characteristic. The QL205GD wavelength is not specified, making the TLHG4605 preferable for applications requiring documented color consistency.