QTLP321CR Equivalent & Substitute Parts

Part Overview

The QTLP321CR is a red power LED manufactured by onsemi, designed for indication applications in through-hole mounting configurations. This component features a 630nm dominant wavelength with a 2.2V forward voltage and 70mA test current. The product is currently obsolete, making identification of compatible substitute parts essential for ongoing design support and component sourcing.

Substiute Parts

QTLP321CR

onsemiIn Stock: 981QTLP321CR Datasheet

Current PartRFQ

TLWR7900

Vishay Semiconductor Opto DivisionIn Stock: 3153TLWR7900 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the QTLP321CR are identified based on the following critical parameters that determine functional compatibility:

• Package / Case: 4-DIP (0.200", 5.08mm) form factor
• Mounting Type: Through Hole
• Color: Red
• Voltage - Forward (Vf) (Typ): 2.2V
• Current - Test: 70mA
• Wavelength range: Red spectrum (618nm–640nm dominant wavelength)
• Lens Style: Round with Domed Top

The TLWR7900 from Vishay Semiconductor Opto Division meets these substitution criteria with matching electrical characteristics and identical package geometry.

Parameter Comparison

Engineering Selection Recommendations

The TLWR7900 is a direct functional substitute for the QTLP321CR. Both components share identical electrical specifications (2.2V forward voltage, 70mA test current) and package geometry (4-DIP 0.200" 5.08mm). The TLWR7900 is currently in active production status, providing supply continuity for designs previously using the obsolete QTLP321CR.

The TLWR7900 offers ROHS3 compliance, supporting modern regulatory requirements. The primary difference is the viewing angle: the TLWR7900 provides 90° viewing angle compared to the QTLP321CR's 50°, which may affect optical performance in applications requiring narrow-angle indication. The wavelength shift from 630nm to 618nm dominant wavelength remains within the red spectrum and is suitable for standard indication applications.

Frequently Asked Questions (FAQ)

Q: Can the TLWR7900 replace the QTLP321CR in existing designs?

A: Yes. Both components share identical package geometry (4-DIP 0.200" 5.08mm), forward voltage (2.2V), and test current (70mA). Direct pin-compatible substitution is possible. The viewing angle difference (90° vs 50°) should be evaluated for specific optical requirements.

Q: What is the wavelength difference between these parts?

A: The QTLP321CR has a 630nm dominant wavelength, while the TLWR7900 has a 618nm dominant wavelength. Both fall within the red spectrum and are suitable for indication applications. The 12nm difference is typical within red LED product lines.

Q: Are there any compliance differences?

A: The TLWR7900 is ROHS3 compliant, supporting current regulatory standards. Compliance status for the QTLP321CR is not specified in available documentation.

Q: What is the physical size difference?

A: Both components have identical length and width (7.62mm L x 7.62mm W). The QTLP321CR has a maximum height of 6.50mm, while the TLWR7900 has a maximum height of 6.40mm. This 0.10mm difference is negligible for standard through-hole PCB applications.

Q: Is the TLWR7900 available in production quantities?

A: Yes. The TLWR7900 is in active production status with current inventory availability, unlike the obsolete QTLP321CR.