Dialight 5219706F LED Red Diffused 4MM T/H Equivalent & Substitute Parts

Part Overview

The Dialight 5219706F is a red LED indication component designed for through-hole mounting applications. This discrete 2V radial LED features a diffused red lens with a 4mm flat-top configuration and delivers 8.7 millicandela at 20mA test current. The product is classified as obsolete, making identification of compatible substitute parts essential for ongoing design support, maintenance, and production continuity.

Substiute Parts

5219706F

DialightIn Stock: 8505219706F Datasheet

Current PartRFQ

LTL-4221

Lite-On Inc.In Stock: 6080LTL-4221 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the Dialight 5219706F is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Forward voltage (Vf): 2V nominal
• Test current: 20mA
• Millicandela rating: 8.7mcd
• Color: Red
• Lens transparency: Diffused

Mechanical Compatibility Criteria:

• Mounting type: Through Hole (radial configuration)
• Lens size: Approximately 3mm to 4mm diameter
• Height: Within acceptable PCB clearance range (5.99mm to 6.55mm)
• Lens style: Round configuration (flat or domed top acceptable for diffused applications)

The Lite-On Inc. LTL-4221 qualifies as a substitute based on matching electrical specifications (2V forward voltage, 20mA test current, 8.7mcd brightness) and compatible through-hole radial mounting. Both components are diffused red LEDs with similar optical and electrical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The Lite-On Inc. LTL-4221 is an active product suitable for substituting the obsolete Dialight 5219706F in applications requiring red diffused LED indication at 2V forward voltage and 20mA test current with 8.7 millicandela brightness output.

Product Status Advantage: The LTL-4221 maintains active production status with 5979 pieces in current inventory, ensuring long-term availability compared to the obsolete 5219706F.

Compliance Considerations: The LTL-4221 is ROHS3 compliant and REACH affected, providing regulatory alignment for modern manufacturing and distribution requirements. The 5219706F is REACH unaffected, reflecting its legacy status.

Physical Integration: The LTL-4221 height of 6.55mm is marginally taller than the 5219706F at 5.99mm. PCB layout verification is necessary to confirm clearance compatibility in space-constrained applications. The T-1 package (3mm lens) is slightly smaller than the 4mm flat-top lens of the original part, which may affect visual prominence in panel-mounted indicator applications.

Optical Characteristics: The LTL-4221 provides a narrower viewing angle (40° versus 145°), resulting in more directional light output. Applications requiring wide-angle diffuse illumination should account for this optical difference in circuit design validation.

Frequently Asked Questions (FAQ)

Q: Can the Lite-On LTL-4221 directly replace the Dialight 5219706F without circuit modification?

A: Electrical substitution is direct. Both components operate at 2V forward voltage with 20mA test current and deliver 8.7 millicandela output. Physical PCB layout verification is required to confirm the 0.56mm height difference and 1mm lens diameter reduction do not create clearance or visual performance issues.

Q: What is the primary difference between these two red LEDs?

A: The primary difference is viewing angle. The 5219706F provides 145° wide-angle diffuse illumination, while the LTL-4221 provides 40° directional output. Peak wavelength differs slightly (630nm versus 635nm), both within the red spectrum. Lens style differs (flat top versus domed top), though both are diffused configurations.

Q: Is the LTL-4221 suitable for applications requiring the wide viewing angle of the original part?

A: The LTL-4221's 40° viewing angle is significantly narrower than the 5219706F's 145° angle. Applications dependent on wide-angle visibility should evaluate whether the reduced viewing angle meets operational requirements before substitution.

Q: What are the compliance and availability advantages of the LTL-4221?

A: The LTL-4221 is an active product with ROHS3 compliance and REACH affected status, supporting modern regulatory requirements. With 5979 pieces in inventory, it provides superior long-term availability compared to the obsolete 5219706F, which has limited stock of 798 pieces.

Q: Are there any package or mounting differences?

A: Both components use through-hole radial mounting. The LTL-4221 is supplied in T-1 package format (3mm lens) versus the 4mm flat-top package of the 5219706F. Both are compatible with standard through-hole PCB assembly processes.