Dialight 5555003 LED Circuit Board Indicator - Equivalent & Substitute Parts

Part Overview

The Dialight 5555003 is a quad red LED circuit board indicator featuring a 2.00mm diameter clear domed lens, designed for 5V applications with 6mA current consumption. This component is classified as obsolete, making identification of suitable substitutes essential for ongoing production and maintenance applications. The 5555003F represents the active production equivalent within the Dialight 555 series, offering improved optical performance while maintaining core electrical compatibility.

Key Parameters

Parameter	Value	Significance for Substitution
Configuration	4 Wide (Quad)	Determines PCB layout and mounting footprint compatibility
Voltage Rating	5V	Critical electrical parameter; substitutes must match rated voltage
Current	6mA	Defines circuit design and power supply requirements
Mounting Type	Through Hole	Determines PCB hole pattern and assembly compatibility
Lens Size	2.00mm Dia	Physical dimension affecting mechanical fit and visual appearance
Color	Red (x 4)	Optical specification; substitutes must maintain red wavelength
Lens Type	Clear	Optical characteristic; affects light transmission and appearance

Substitute Part Grouping Explanation

The Dialight 5555003F qualifies as a direct substitute based on the following alignment of critical parameters:

Electrical Compatibility: Both parts operate at 5V with 6mA current consumption, ensuring circuit-level compatibility without modification
Mechanical Compatibility: Both feature 4-wide quad configuration with through-hole mounting, maintaining identical PCB footprint and assembly process
Optical Specification: Both provide red LED indication with clear lens, preserving the intended visual function
Physical Dimensions: Both utilize 2.00mm diameter lens size, ensuring mechanical fit within existing enclosures and assemblies

The 5555003F represents an active production part within the same 555 series, providing continuity of supply and design intent.

Parameter Comparison

Parameter	5555003 (Obsolete)	5555003F (Active)	Compatibility Notes
Manufacturer	Dialight	Dialight	Same manufacturer ensures design consistency
Series	555	555	Same product series
Configuration	4 Wide	4 Wide	Identical quad arrangement
Color	Red (x 4)	Red (x 4)	Identical optical color
Voltage Rating	5V	5V	Identical electrical rating
Current	6mA	6mA	Identical current specification
Lens Type	Clear	Clear	Identical lens optical property
Lens Size	2.00mm Dia	—	5555003F lens size not specified in data
Mounting Type	Through Hole	Through Hole	Identical mounting method
Wavelength - Peak	655nm	650nm	Minor wavelength variation within red spectrum; functionally equivalent
Millicandela Rating	0.6mcd	1.9mcd	5555003F provides higher luminous intensity
Viewing Angle	35°	40°	5555003F provides wider viewing angle
Product Status	Obsolete	Active	5555003F is current production part
RoHS Status	RoHS non-compliant	ROHS3 Compliant	5555003F meets current environmental regulations

Engineering Selection Recommendations

Primary Recommendation: Dialight 5555003F

The 5555003F is the appropriate substitute for the obsolete 5555003 based on the following engineering criteria:

Product Status Alignment: The 5555003F is an active production part within the same 555 series, ensuring long-term supply continuity and design support
Electrical Equivalence: Identical 5V/6mA specifications ensure direct circuit compatibility without design modification
Mechanical Compatibility: Matching 4-wide through-hole configuration preserves PCB layout and assembly processes
Regulatory Compliance: The 5555003F achieves ROHS3 compliance, meeting current environmental and regulatory requirements, whereas the 5555003 is RoHS non-compliant
Optical Performance Enhancement: The 5555003F provides improved luminous intensity (1.9mcd vs. 0.6mcd) and wider viewing angle (40° vs. 35°), delivering superior optical performance within the same form factor

No design modifications are required for substitution. The 5555003F can be used as a direct replacement in existing assemblies and PCB designs.

Frequently Asked Questions (FAQ)

Q: Can the 5555003F be used as a direct replacement for the 5555003 without PCB modifications?

A: Yes. Both parts share identical electrical ratings (5V, 6mA), mechanical configuration (4-wide through-hole), and optical color (red with clear lens). No PCB layout or circuit design changes are required.

Q: What are the differences between the 5555003 and 5555003F?

A: The primary differences are product status, compliance, and optical performance. The 5555003F is an active production part with ROHS3 compliance, whereas the 5555003 is obsolete and RoHS non-compliant. The 5555003F also provides higher luminous intensity (1.9mcd vs. 0.6mcd) and a wider viewing angle (40° vs. 35°). Peak wavelength differs slightly (650nm vs. 655nm), both within the red spectrum.

Q: Are there any compatibility concerns with the improved optical performance of the 5555003F?

A: The enhanced luminous intensity and viewing angle of the 5555003F represent performance improvements. These changes do not create compatibility issues; they enhance visibility and viewing characteristics. Applications requiring the original lower intensity would need to evaluate whether the increased brightness is acceptable for their specific use case.

Q: What is the packaging difference between these parts?

A: The 5555003 is specified with "-" packaging notation, while the 5555003F is supplied in Bulk packaging. Both are through-hole components suitable for standard PCB assembly processes.

Q: Are both parts RoHS compliant?

A: No. The 5555003 is RoHS non-compliant, while the 5555003F is ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the 5555003F is the appropriate choice.

Q: Can the 5555003F be used in new designs?

A: Yes. The 5555003F is an active production part and is the recommended choice for all new designs requiring a quad red LED circuit board indicator in the 555 series.

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