Dialight 5555401 LED Circuit Board Indicator - Equivalent & Substitute Parts

Part Overview

The Dialight 5555401 is a 4-wide yellow LED circuit board indicator designed for through-hole mounting applications. This component features a 2.00mm diameter diffused lens with domed top, operating at 2.2V with 20mA current consumption and 5mcd brightness output. The part is classified as obsolete, making identification of suitable substitutes essential for ongoing production and maintenance applications. The primary substitute maintains core electrical specifications while offering improved lens clarity and active product status.

Substiute Parts

5555401

DialightIn Stock: 9685555401 Datasheet

Current PartRFQ

5555401F

DialightIn Stock: 7635555401F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Dialight 5555401 is determined by the following critical parameters:

• Electrical Compatibility: Voltage rating (2.2V) and current consumption (20mA) must remain constant
• Optical Specifications: Color (Yellow), wavelength peak (583nm), and mounting type (Through Hole) must match
• Configuration: 4-wide LED arrangement must be maintained
• Physical Form Factor: Lens diameter (2.00mm) and through-hole mounting interface must be compatible

The substitute part 5555401F meets all mandatory electrical and mechanical compatibility criteria while offering enhanced optical characteristics through a clear lens design and improved brightness uniformity (2mcd vs. 5mcd rating difference reflects lens type variation rather than incompatibility).

Parameter Comparison

Engineering Selection Recommendations

The Dialight 5555401F serves as the direct substitute for the obsolete 5555401 model. Selection of the 5555401F is supported by the following engineering factors:

• Product Status: The 5555401F maintains active product status, ensuring continued availability and supply chain reliability
• Regulatory Compliance: The 5555401F achieves ROHS3 compliance, whereas the original part is non-compliant, making the substitute the appropriate choice for applications subject to RoHS regulations
• Electrical Equivalence: Both parts operate identically at 2.2V and 20mA, ensuring direct circuit compatibility without design modification
• Optical Variation: The shift from diffused to clear lens design and the corresponding millicandela rating difference (5mcd to 2mcd) reflects lens material properties rather than functional incompatibility. The increased viewing angle (40° vs. 35°) provides broader light distribution characteristics

The 5555401F is suitable for direct replacement in applications where the original 5555401 is no longer available or where regulatory compliance is required.

Frequently Asked Questions (FAQ)

Q: Can the 5555401F replace the 5555401 in existing circuit designs?

A: Yes. Both parts share identical electrical specifications (2.2V, 20mA) and mounting configuration (through-hole, 4-wide arrangement). The circuit interface remains unchanged. The lens type variation (clear vs. diffused) affects light distribution characteristics but does not impact electrical compatibility.

Q: What is the difference between the diffused and clear lens types?

A: The original 5555401 features a diffused lens that scatters light more uniformly across a narrower viewing angle (35°). The 5555401F uses a clear lens that provides a wider viewing angle (40°) with more directional light output. The millicandela rating difference (5mcd vs. 2mcd) reflects these optical properties. Selection between these types depends on the specific lighting requirements of the application.

Q: Is the 5555401F RoHS compliant?

A: Yes. The 5555401F is ROHS3 compliant, whereas the original 5555401 is non-compliant. For applications subject to RoHS regulations, the 5555401F is the required choice.

Q: Are there any packaging differences between these parts?

A: The 5555401 is supplied in standard packaging, while the 5555401F is supplied in bulk packaging. Both maintain identical through-hole mounting interfaces and component dimensions.

Q: What is the current inventory status?

A: The 5555401 (obsolete) has 908 pieces in stock. The 5555401F (active) has 664 pieces in stock. For new designs or long-term production requirements, the 5555401F is the recommended selection due to its active product status.