LTL-3221A Equivalent & Substitute Parts

Part Overview

The LTL-3221A is a red diffused through-hole LED manufactured by Lite-On Inc., designed for indication applications with a dominant wavelength of 623nm. This component features a rectangular flat-top lens with 5.00mm x 2.00mm dimensions and a 140° viewing angle. The product is currently classified as obsolete, making identification of compatible substitute parts essential for ongoing design support and production continuity.

Substiute Parts

LTL-3221A

Lite-On Inc.In Stock: 1081LTL-3221A Datasheet

Current PartRFQ

LTL-433HR

Lite-On Inc.In Stock: 948LTL-433HR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LTL-3221A is determined by strict alignment of the following critical parameters:

• Color: Red
• Lens Transparency: Diffused
• Lens Style: Rectangle with Flat Top
• Lens Size: 5.00mm x 2.00mm
• Voltage - Forward (Vf) (Typ): 2V
• Viewing Angle: 140°
• Mounting Type: Through Hole
• Wavelength - Dominant: 623nm
• Wavelength - Peak: 635nm
• Package / Case: Radial

The LTL-433HR meets all substitution criteria as a parametric equivalent. Minor variations in test current (10mA vs. 20mA) and maximum height (7.50mm vs. 7.00mm) remain within acceptable tolerance for indication applications. The LTL-433HR is currently in active production status with full RoHS3 and REACH compliance.

Parameter Comparison

Engineering Selection Recommendations

The LTL-433HR is the direct parametric equivalent for the obsolete LTL-3221A. Both components share identical optical and electrical characteristics, including forward voltage, wavelength specifications, and viewing angle. The LTL-433HR is currently in active production with full RoHS3 compliance and REACH documentation, making it suitable for new designs and production continuity.

The LTL-433HR operates at a lower test current (10mA vs. 20mA), which may result in reduced power consumption in applications where current is not actively limited by circuit design. The maximum height difference of 0.50mm (7.50mm vs. 7.00mm) should be evaluated against PCB layout constraints and mechanical clearance requirements.

Frequently Asked Questions (FAQ)

Q: Can the LTL-433HR be used as a direct replacement for the LTL-3221A?

A: Yes. The LTL-433HR is a parametric equivalent with identical color, lens transparency, lens style, lens size, forward voltage, wavelength specifications, and viewing angle. Both components use radial through-hole mounting and are suitable for indication applications.

Q: What is the significance of the different test currents (20mA vs. 10mA)?

A: Test current is the standard measurement condition used to characterize LED brightness. The difference does not indicate incompatibility. Both components maintain the same 3.7mcd brightness rating. Circuit design should independently specify the operating current based on application requirements.

Q: Does the 0.50mm height difference affect compatibility?

A: The LTL-433HR has a maximum height of 7.50mm compared to 7.00mm for the LTL-3221A. This difference must be evaluated against specific PCB layout and mechanical clearance requirements. In most indication applications, this variation is acceptable.

Q: What compliance certifications apply to the LTL-433HR?

A: The LTL-433HR is RoHS3 compliant and REACH affected. These certifications ensure compliance with current environmental and hazardous substance regulations for electronic components.

Q: Are there other substitute options available?

A: The LTL-433HR documentation references additional substitutes (XSUR18D, WP113IDT, HLMP-S201). These parts require independent parametric verification against the LTL-3221A specifications to confirm substitution eligibility.