Dialight 5500407 LED Circuit Board Indicator - Equivalent & Substitute Parts

Part Overview

The Dialight 5500407 is a 5mm red LED circuit board indicator designed for through-hole, right-angle mounting applications. This part operates at 2V with a 20mA forward current and delivers 12.3mcd luminous intensity with a 60° viewing angle. The product is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. Active alternatives from Dialight and other manufacturers provide direct or functional replacements with comparable electrical and mechanical characteristics.

Substiute Parts

5500407

DialightIn Stock: 10455500407 Datasheet

Current PartRFQ

5500405F

DialightIn Stock: 27995500405F Datasheet

DirectRFQ

5500407F

DialightIn Stock: 37275500407F Datasheet

DirectRFQ

H178CRD

Bivar Inc.In Stock: 1293H178CRD Datasheet

SimilarRFQ

WP1503CB/ID

KingbrightIn Stock: 2594WP1503CB/ID Datasheet

SimilarRFQ

WP73JB/IDA

KingbrightIn Stock: 1159WP73JB/IDA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Dialight 5500407 is determined by the following critical parameters:

Direct Compatibility Parameters:

• Color: Red
• Lens Size: 5mm, T-1 3/4
• Mounting Type: Through Hole, Right Angle
• Forward Voltage: 2V (±0.1V tolerance acceptable)
• Forward Current: 20mA (±10mA tolerance acceptable)
• Lens Type: Diffused
• Configuration: Single

Functional Compatibility Parameters:

• Wavelength - Peak: 635nm (±15nm acceptable for red spectrum)
• Viewing Angle: 60° (±15° acceptable)
• Luminous Intensity: 12.3mcd (±50% acceptable for general indication applications)

Substitute parts are classified into two categories:

Direct Equivalents: Parts with identical electrical ratings, mechanical form factor, and mounting configuration from the same or equivalent manufacturer series.

Functional Substitutes: Parts with the same lens size, mounting type, and color but with variations in forward current, luminous intensity, or wavelength that remain within acceptable operating ranges for circuit board indication applications.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 - Direct Equivalents (Preferred):

5500407F and 5500405F are direct equivalents from Dialight's active 550 series. Both parts maintain identical electrical specifications (2V, 20mA, 12.3mcd, 635nm) and mechanical form factors (5mm T-1 3/4, right-angle through-hole mounting). Both are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain stability. 5500407F is the direct packaging variant of the obsolete 5500407, while 5500405F provides an alternative within the same series. These parts require no circuit redesign or application verification.

Tier 2 - Functional Substitutes (Conditional):

H178CRD (Bivar Inc.) maintains the same lens size, mounting configuration, and diffused lens type. However, it operates at 2.1V forward voltage (0.1V higher), delivers significantly lower luminous intensity (2mcd versus 12.3mcd), and has a narrower viewing angle (45° versus 60°). This part is suitable only for applications where lower brightness is acceptable and the 0.1V voltage difference does not affect circuit operation.

WP1503CB/ID (Kingbright) operates at 30mA forward current (50% higher than the original specification) and delivers 50mcd luminous intensity (4x higher). The wavelength (627nm) is within acceptable red spectrum range. This part requires circuit current-limiting resistor adjustment and is suitable for applications requiring higher brightness. The tinted lens may affect color perception compared to the standard diffused lens.

WP73JB/IDA (Kingbright) has a reduced lens diameter (4.80mm versus 5mm) and operates at 30mA with 40mcd intensity. The smaller form factor may not fit existing PCB mounting holes designed for 5mm T-1 3/4 components. This part is not recommended for direct substitution without mechanical redesign.

Compliance Considerations:

All active substitute parts carry ROHS3 compliance certification. The original 5500407 does not specify RoHS status. Designs requiring RoHS compliance should transition to 5500407F or 5500405F to ensure regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can I use 5500407F as a direct replacement for the obsolete 5500407?

A: Yes. 5500407F is the active equivalent from Dialight with identical electrical ratings (2V, 20mA, 12.3mcd), wavelength (635nm), and mechanical specifications (5mm T-1 3/4, right-angle through-hole). No circuit modifications are required.

Q: What is the difference between 5500407F and 5500405F?

A: Both are Dialight 550 series red LEDs with identical electrical and optical specifications. The primary difference is packaging: 5500407F is supplied in bulk packaging, while 5500405F is also bulk packaged. Both are active products suitable for direct substitution of the obsolete 5500407.

Q: Can I use WP1503CB/ID as a substitute if my circuit uses a current-limiting resistor?

A: WP1503CB/ID operates at 30mA forward current versus the original 20mA specification. If your circuit is designed with a fixed current-limiting resistor for 20mA operation, using this part will result in 50% higher current draw and reduced LED lifespan. The resistor value must be recalculated for 30mA operation. Additionally, the luminous intensity is 4x higher (50mcd versus 12.3mcd), which may cause excessive brightness in indication applications.

Q: Why is H178CRD not recommended as a primary substitute?

A: H178CRD has three significant deviations: forward voltage of 2.1V (versus 2V), luminous intensity of only 2mcd (versus 12.3mcd), and a narrower viewing angle of 45° (versus 60°). The substantially lower brightness makes it unsuitable for applications requiring the original 12.3mcd specification. It is only suitable for low-brightness indication where reduced visibility is acceptable.

Q: Will WP73JB/IDA fit in a PCB designed for 5mm T-1 3/4 LEDs?

A: No. WP73JB/IDA has a reduced lens diameter of 4.80mm, which will not fit standard 5mm mounting holes. Mechanical redesign of the PCB would be required. This part is not recommended for direct substitution without hardware modification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts (5500407F, 5500405F, H178CRD, WP1503CB/ID, and WP73JB/IDA) carry ROHS3 compliance certification. The original obsolete 5500407 does not specify RoHS status. Designs requiring regulatory compliance should use active alternatives.

Q: What is the impact of wavelength differences between substitutes?

A: The original 5500407 operates at 635nm (standard red). H178CRD operates at 700nm (deep red), and Kingbright parts operate at 627nm (bright red). These differences are within the red spectrum and are visually similar to the human eye. Wavelength selection should be based on application requirements for color matching or spectral response.

Q: Can I mix different substitute parts in the same design?

A: Not recommended. Mixing parts with different forward currents (20mA versus 30mA), luminous intensities (2mcd to 50mcd), or mounting configurations will result in inconsistent brightness and viewing characteristics across the circuit board. Standardize on a single substitute part number for uniform performance.