H178CYD Equivalent and Substitute Parts

Part Overview

The H178CYD is an LED Circuit Board Indicator manufactured by Bivar Inc., featuring a single yellow diffused lens in a 5mm T-1 3/4 package format. This component is designed for circuit board indication applications requiring a 2V, 20mA yellow LED with a 45° viewing angle and 25mcd brightness rating. The product maintains Active status and is ROHS3 compliant, making it suitable for modern electronics applications. Substitute parts are necessary when addressing supply chain constraints, inventory limitations, or when design requirements permit electrical and mechanical parameter variations within acceptable tolerances.

Substiute Parts

H178CYD

Bivar Inc.In Stock: 897H178CYD Datasheet

Current PartRFQ

5500307F

DialightIn Stock: 28115500307F Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The H178CYD can be substituted with the Dialight 5500307F based on compatibility in the following critical electrical and mechanical parameters:

Compatibility Parameters:

• Color: Both parts provide yellow indication
• Configuration: Both are single-element LEDs
• Current Rating: Both are rated at 20mA
• Lens Type: Both feature diffused lenses
• Voltage Rating: H178CYD operates at 2V; 5500307F at 2.1V (within acceptable tolerance for series current-limiting circuit applications)
• RoHS Compliance: Both are ROHS3 compliant

Parameter Variations:

• Wavelength - Peak: H178CYD 590nm vs. 5500307F 585nm (5nm difference within visible yellow spectrum)
• Millicandela Rating: H178CYD 25mcd vs. 5500307F 12.3mcd (brightness difference requires circuit verification)
• Viewing Angle: H178CYD 45° vs. 5500307F 60° (wider viewing angle on substitute)
• Lens Style: H178CYD round with domed top vs. 5500307F through-hole right-angle mounting
• Packaging: H178CYD in tray vs. 5500307F in bulk

The 5500307F serves as a functional substitute when mechanical mounting requirements permit through-hole, right-angle orientation, and when the specified brightness reduction is acceptable for the application.

Parameter Comparison

Engineering Selection Recommendations

Both the H178CYD and 5500307F are active products with ROHS3 compliance and unlimited moisture sensitivity ratings, making them suitable for equivalent applications in compliant designs. The H178CYD is the primary choice when the specific mechanical envelope of a round domed-top 5mm lens and the 25mcd brightness specification are design requirements. The 5500307F serves as an alternative when through-hole right-angle mounting is required and when the reduced brightness specification of 12.3mcd is acceptable for the intended indication function. Product availability and supply chain considerations determine practical substitution selections between these two qualified components.

Frequently Asked Questions (FAQ)

Can the 5500307F directly replace the H178CYD without circuit modification?

Both parts share identical current ratings (20mA) and compatible voltage specifications (2V vs. 2.1V). Substitution is feasible when the mounting geometry of the through-hole, right-angle 5500307F aligns with the PCB design. The reduced brightness of the 5500307F (12.3mcd vs. 25mcd) requires confirmation that indication visibility remains adequate for the application.

What are the key electrical compatibility factors?

The H178CYD and 5500307F both operate at 20mA nominal current, with voltage ratings of 2V and 2.1V respectively. The 0.1V difference is within typical tolerance for current-limiting series resistor circuits. Both components are ROHS3 compliant with MSL-1 ratings.

How do viewing angle differences affect substitution?

The H178CYD provides a 45° viewing angle, while the 5500307F offers a wider 60° viewing angle. The wider viewing angle of the substitute may be beneficial for applications requiring visibility from broader angles, but the mounting orientation difference (vertical vs. right-angle) determines practical visibility in the circuit design context.

Are there wavelength considerations for color matching?

The H178CYD wavelength-peak is 590nm and the 5500307F is 585nm, both in the yellow spectrum. The 5nm difference is not visually significant for circuit board indication purposes and presents no functional compatibility issue.

What packaging differences exist?

The H178CYD is supplied in tray packaging, while the 5500307F is supplied in bulk packaging. Packaging format does not affect component functionality but influences procurement, handling, and inventory management processes.