QTLP320CY Yellow LED 4-DIP Through Hole - Equivalent & Substitute Parts

Part Overview

The QTLP320CY is a yellow 589nm LED indication component manufactured by onsemi in a 4-DIP (0.200", 5.08mm) through-hole package. This discrete LED operates at 2.3V forward voltage with a 70mA test current and features a 3.00mm round domed lens with 70° viewing angle. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing system support, maintenance, and new design implementations where this LED specification remains functionally appropriate.

Substiute Parts

QTLP320CY

onsemiIn Stock: 949QTLP320CY Datasheet

Current PartRFQ

TLWY7600

Vishay Semiconductor Opto DivisionIn Stock: 943TLWY7600 Datasheet

SimilarRFQ

QTLP320CY

onsemiIn Stock: 949QTLP320CY Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the QTLP320CY is determined by strict alignment of the following parameters:

• Package / Case: 4-DIP (0.200", 5.08mm) form factor and through-hole mounting compatibility
• Color: Yellow LED indication
• Wavelength Range: Dominant wavelength 589-594nm (yellow spectrum)
• Voltage - Forward (Vf): Operating range 2.1V to 2.3V
• Current - Test: 70mA test current specification
• Lens Configuration: Round domed top lens style
• Mounting Type: Through hole PCB mounting

The TLWY7600 from Vishay Semiconductor Opto Division meets these substitution criteria. This part maintains identical package geometry, yellow color specification, compatible forward voltage (2.1V vs. 2.3V), matching test current (70mA), and equivalent through-hole mounting characteristics. The wavelength shift from 589nm to 592nm dominant remains within the yellow LED spectrum and does not compromise functional performance in indication applications.

Parameter Comparison

Engineering Selection Recommendations

The TLWY7600 (Vishay) is the qualified substitute for the obsolete QTLP320CY (onsemi). Selection is based on the following engineering factors:

• Product Status: The QTLP320CY is obsolete; the TLWY7600 is active and currently available in production quantities (848 pcs in stock).
• Regulatory Compliance: The TLWY7600 carries ROHS3 compliance certification, meeting current environmental and regulatory requirements. Both parts maintain REACH Unaffected status and identical ECCN/HTSUS classifications.
• Electrical Compatibility: Forward voltage differential (2.1V vs. 2.3V) is within acceptable tolerance for LED indication circuits. Test current specification is identical at 70mA.
• Mechanical Compatibility: Package footprint, mounting type, and physical dimensions are equivalent. Height variance (6.40mm vs. 6.10mm) is 0.30mm and does not impact PCB layout or assembly clearance in standard through-hole applications.
• Optical Performance: Wavelength shift (589nm to 592nm) remains within yellow spectrum perception. Viewing angle reduction (70° to 60°) narrows the field of view but maintains adequate visibility for indication applications.

Frequently Asked Questions (FAQ)

Q: Can the TLWY7600 be used as a direct replacement for the QTLP320CY in existing designs?

A: Yes. Both parts share identical 4-DIP (0.200", 5.08mm) package geometry and through-hole mounting configuration. PCB footprints are compatible without modification. The 0.30mm height difference does not affect assembly or clearance in standard applications.

Q: What is the impact of the forward voltage difference (2.3V vs. 2.1V)?

A: The 0.2V reduction in forward voltage of the TLWY7600 results in lower power dissipation and reduced heat generation. Existing current-limiting resistor values will produce slightly higher LED current. For indication applications operating at 70mA test current, this difference is operationally acceptable. Circuit verification is not required for standard indication use cases.

Q: Does the viewing angle change from 70° to 60° affect functionality?

A: The TLWY7600 has a narrower viewing angle (60° vs. 70°), concentrating light output within a tighter cone. For indication applications where the LED is viewed from a fixed position or narrow range, this change is functionally equivalent. Applications requiring wide-angle visibility should evaluate the specific viewing geometry requirements.

Q: Are there compliance or certification differences between these parts?

A: The TLWY7600 carries ROHS3 compliance; the QTLP320CY does not specify RoHS status. Both parts are REACH Unaffected and share identical ECCN (EAR99) and HTSUS (8541.41.0000) classifications. The TLWY7600 meets current environmental regulations for new designs and procurement.

Q: What is the wavelength difference between 589nm and 592nm?

A: Both wavelengths fall within the yellow LED spectrum and are perceptually identical to the human eye. The 3nm shift represents a minor variation in dominant wavelength and does not affect color perception or indication functionality.

Q: Is the TLWY7600 available in the same packaging format?

A: The TLWY7600 is supplied in tube packaging, whereas the QTLP320CY packaging format is not specified in the data. Both parts use the identical 4-DIP (0.200", 5.08mm) component package. Tube packaging is standard for through-hole LED components and does not affect component performance or PCB assembly compatibility.