Dialight 5219428 LED Yellow Diffused T-1 Through Hole - Equivalent & Substitute Parts

Part Overview

The Dialight 5219428 is a yellow diffused LED indicator in T-1 through-hole package configuration, designed for discrete 2.1V radial applications. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design requirements and production continuity. Substitute parts must maintain compatibility across electrical characteristics, mechanical form factor, and mounting specifications to ensure direct replacement capability.

Substiute Parts

5219428

DialightIn Stock: 10255219428 Datasheet

Current PartRFQ

5219428F

DialightIn Stock: 8195219428F Datasheet

DirectRFQ

LTL-4251N

Lite-On Inc.In Stock: 32787LTL-4251N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Dialight 5219428 are identified based on the following critical parameters that determine functional equivalence:

Primary Compatibility Criteria:

• Color: Yellow
• Lens Transparency: Diffused
• Voltage - Forward (Vf): 2.1V
• Current - Test: 10mA
• Mounting Type: Through Hole
• Package / Case: Radial
• Supplier Device Package: T-1

Secondary Compatibility Parameters:

• Lens Style: Round with Domed Top
• Viewing Angle: 45° or greater
• Lens Size: 3mm to 3.09mm diameter
• Height: Within 5.85mm to 6.48mm range

Substitutes are classified into two categories: Direct Manufacturer alternatives (same manufacturer, active status) and Similar Manufacturer alternatives (different manufacturer, active status). Both categories maintain electrical and mechanical compatibility within the specified parameter ranges.

Parameter Comparison

Engineering Selection Recommendations

Dialight 5219428F (Direct Substitute): The 5219428F is the primary substitute for the obsolete 5219428. Both components share identical electrical specifications (2.1V forward voltage, 10mA test current), mechanical dimensions (6.48mm height, 3.09mm lens diameter), and mounting configuration (T-1 radial through-hole). The 5219428F maintains active product status and achieves ROHS3 compliance, addressing regulatory requirements that the original part does not meet. The increased millicandela rating (16mcd versus 6.3mcd) provides enhanced luminous intensity while maintaining identical viewing angle and lens characteristics. This part is recommended as the primary replacement for new designs and production continuity.

Lite-On Inc. LTL-4251N (Similar Substitute): The LTL-4251N provides functional equivalence with minor mechanical variations. Electrical parameters remain identical (2.1V forward voltage, 10mA test current, 585nm peak wavelength). The component features a slightly reduced height (5.85mm versus 6.48mm) and marginally smaller lens diameter (3mm versus 3.09mm), with an expanded viewing angle (60° versus 45°). The LTL-4251N is active and ROHS3 compliant. This part is suitable for applications where the mechanical envelope permits the dimensional differences and where the increased viewing angle provides design benefits. Availability is significantly higher (32,761 pieces in stock versus 761 for the 5219428F).

Frequently Asked Questions (FAQ)

Q: Can the Dialight 5219428F directly replace the obsolete 5219428 without circuit modification?

A: Yes. The 5219428F maintains identical electrical specifications (2.1V forward voltage, 10mA test current) and mechanical form factor (T-1 radial through-hole, 6.48mm height, 3.09mm lens diameter). No circuit modifications are required for direct substitution.

Q: What is the primary difference between the 5219428F and the original 5219428?

A: The 5219428F provides increased luminous intensity (16mcd versus 6.3mcd) and achieves ROHS3 compliance, whereas the original part is RoHS non-compliant. All other electrical and mechanical parameters remain identical.

Q: Is the Lite-On LTL-4251N compatible with the same PCB footprint as the 5219428?

A: The LTL-4251N is mechanically compatible with the same through-hole radial footprint. However, the reduced height (5.85mm versus 6.48mm) and slightly smaller lens diameter (3mm versus 3.09mm) should be verified against specific mechanical clearance requirements in the application. The component will function electrically in the same circuit.

Q: What are the key parameters that determine substitution compatibility for this LED?

A: Substitution compatibility is determined by: color (yellow), lens transparency (diffused), forward voltage (2.1V), test current (10mA), mounting type (through-hole), package type (radial T-1), lens style (round with domed top), and peak wavelength (585nm). Variations in millicandela rating, viewing angle, and minor dimensional differences do not prevent functional substitution.

Q: Why does the 5219428F have higher millicandela rating than the original part?

A: The millicandela rating reflects luminous intensity at the specified test current (10mA). The 5219428F delivers greater light output (16mcd) compared to the original (6.3mcd) while maintaining identical electrical drive conditions. This represents an improvement in the component design and does not affect circuit compatibility.

Q: Are there compliance differences between the substitute parts?

A: Yes. The original 5219428 is RoHS non-compliant, while both the 5219428F and LTL-4251N are ROHS3 compliant. All three parts are REACH Unaffected. For applications subject to RoHS regulations, the 5219428F or LTL-4251N must be selected.

Q: What is the difference in viewing angle between these parts, and does it affect substitution?

A: The original 5219428 and 5219428F both specify 45° viewing angle, while the LTL-4251N specifies 60°. The wider viewing angle of the LTL-4251N provides greater light distribution but does not prevent substitution. Selection depends on whether the application requires the specific viewing angle characteristic.

Q: Which substitute part should be selected for new production designs?

A: The Dialight 5219428F is recommended for new designs as it maintains complete electrical and mechanical equivalence to the original part while providing active product status and regulatory compliance. The LTL-4251N is an alternative where higher availability or expanded viewing angle provides design advantages.