Dialight 5219427F Red LED T-1 Through Hole - Equivalent & Substitute Parts

Part Overview

The Dialight 5219427F is a red diffused LED indicator in T-1 through-hole package, designed for discrete 2V radial applications with 630nm dominant wavelength. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The 5219427F delivers 16mcd brightness at 10mA test current with a 45° viewing angle and 3.00mm lens diameter.

Substiute Parts

5219427F

DialightIn Stock: 9785219427F Datasheet

Current PartRFQ

5219216F

DialightIn Stock: 27365219216F Datasheet

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LTL-4221N

Lite-On Inc.In Stock: 53128LTL-4221N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the Dialight 5219427F is determined by the following critical parameters:

• Forward voltage (Vf): 2V nominal
• Test current: 10mA
• Mounting type: Through hole radial configuration
• Lens size: 3.00mm diameter
• Lens style: Round with domed top
• Lens transparency: Diffused
• Color: Red
• Wavelength range: 625nm to 650nm dominant wavelength acceptable
• Package type: T-1 or 3mm equivalent

The substitute parts identified maintain electrical compatibility (2V forward voltage, 10mA test current) and mechanical compatibility (through-hole radial mounting, 3mm lens diameter, diffused lens). Variations in millicandela rating and viewing angle are acceptable within the constraints of the application circuit design. Wavelength tolerance permits substitutes with 625nm dominant wavelength, as this remains within the red spectrum classification.

Parameter Comparison

Engineering Selection Recommendations

The Dialight 5219427F is obsolete and no longer in active production. Both substitute parts maintain full electrical compatibility with 2V forward voltage and 10mA test current specifications.

Dialight 5219216F is the primary substitute within the same manufacturer family. This part is active and ROHS3 compliant. The 5219216F operates at identical electrical parameters and maintains the same 3.00mm lens diameter and through-hole radial mounting. The primary differences are reduced millicandela rating (8.7mcd versus 16mcd) and increased viewing angle (60° versus 45°). Height is reduced to 6.00mm maximum.

Lite-On Inc. LTL-4221N is an alternative substitute from a different manufacturer. This part is active and ROHS3 compliant. The LTL-4221N maintains identical electrical parameters and T-1 package designation. Millicandela rating and viewing angle match the 5219216F. Height is further reduced to 5.85mm maximum.

Both substitutes are suitable for applications where the reduced brightness (8.7mcd versus 16mcd) and wider viewing angle (60° versus 45°) are acceptable within circuit design constraints. The wavelength shift from 630nm to 625nm dominant remains within red spectrum classification.

Frequently Asked Questions (FAQ)

Q: Can the Dialight 5219216F directly replace the 5219427F?

A: Yes, electrically and mechanically. Both parts operate at 2V forward voltage and 10mA test current with identical through-hole radial mounting and 3.00mm lens diameter. The 5219216F is active and ROHS3 compliant. The primary design consideration is the reduced brightness (8.7mcd versus 16mcd) and wider viewing angle (60° versus 45°).

Q: What is the difference between T-1 and 3mm package designations?

A: Both designations refer to the same physical form factor for through-hole LEDs with 3.00mm lens diameter. T-1 is the standard industry designation. The 5219216F uses "3mm" designation while the 5219427F and LTL-4221N use "T-1" designation. They are mechanically equivalent.

Q: Is the Lite-On LTL-4221N compatible with the original 5219427F circuit?

A: Yes, electrically and mechanically. The LTL-4221N maintains 2V forward voltage, 10mA test current, and through-hole radial mounting. The reduced brightness (8.7mcd) and wider viewing angle (60°) must be evaluated against circuit requirements. Height is 5.85mm maximum, slightly lower than the original 6.48mm.

Q: What compliance certifications apply to the substitute parts?

A: Both substitute parts are ROHS3 compliant and REACH unaffected. Both carry EAR99 ECCN classification. Moisture sensitivity level is 1 (unlimited) for all parts.

Q: Does wavelength shift from 630nm to 625nm affect application performance?

A: Both wavelengths are within the red spectrum. The 5nm shift in dominant wavelength is within standard red LED classification. Visual appearance remains red. Application-specific requirements should determine acceptability.