Dialight 5520711 LED Circuit Board Indicator - Equivalent & Substitute Parts

Part Overview

The Dialight 5520711 is a dual-level LED circuit board indicator featuring green and red LEDs in a 5mm T-1 3/4 through-hole right-angle configuration. This component is classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing design requirements and production continuity. The part delivers 40mcd green and 90mcd red output at 20mA operating current with a 60° viewing angle and diffused lens design.

Substiute Parts

5520711

DialightIn Stock: 11945520711 Datasheet

Current PartRFQ

5520711F

DialightIn Stock: 21805520711F Datasheet

DirectRFQ

H278CBC

Bivar Inc.In Stock: 937H278CBC Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Dialight 5520711 are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Dual-color LED configuration (Green and Red, 2 High)
• 5mm T-1 3/4 lens size
• Through-hole right-angle mounting
• Voltage compatibility (Green 2.1V nominal, Red 1.8-2.0V nominal)
• Operating current range (20-30mA acceptable for circuit board indicator applications)
• Diffused lens type
• Round domed top lens style

Substitution Logic: Parts are grouped as direct or similar substitutes based on adherence to these core parameters. Direct substitutes maintain identical electrical and mechanical specifications. Similar substitutes accommodate minor variations in current rating, millicandela output, and viewing angle while preserving the fundamental form factor and functional purpose.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitute - Dialight 5520711F: The 5520711F is the primary substitute for the obsolete 5520711. Both parts share identical electrical specifications (20mA, 2.1V green, 1.8V red) and mechanical form factors. The 5520711F maintains active product status and achieves ROHS3 compliance, addressing regulatory requirements for new designs. This part is recommended as the first-choice replacement for direct compatibility.

Similar Substitute - Bivar H278CBC: The H278CBC provides functional equivalence with notable parameter variations. This part accommodates higher operating current (30mA versus 20mA) and exhibits reduced millicandela output (8mcd green, 6mcd red versus 40mcd and 90mcd respectively). The viewing angle is narrower at 45° compared to 60°. The H278CBC is suitable for applications where brightness reduction and narrower viewing angle are acceptable trade-offs. Red wavelength differs at 625nm versus 660nm. This part is also ROHS3 compliant and maintains active status.

Both substitute parts maintain identical MSL ratings, ECCN classification, and HTSUS codes as the original component.

Frequently Asked Questions (FAQ)

Q: Can the 5520711F directly replace the obsolete 5520711 without circuit modification? A: Yes. The 5520711F maintains identical voltage ratings (2.1V green, 1.8V red), current requirements (20mA), and mechanical form factor (5mm T-1 3/4 through-hole right-angle). No circuit redesign is required for direct substitution.

Q: What are the key differences between the 5520711F and H278CBC? A: The primary differences are operating current (20mA versus 30mA), brightness output (40mcd/90mcd versus 8mcd/6mcd), viewing angle (60° versus 45°), and red wavelength (660nm versus 625nm). The H278CBC requires higher current and delivers lower brightness. Circuit current-limiting resistor values must be recalculated if switching to the H278CBC.

Q: Is the H278CBC suitable for applications requiring high brightness? A: No. The H278CBC produces significantly lower millicandela output (8mcd green, 6mcd red) compared to the 5520711 series (40mcd green, 90mcd red). Applications requiring high visibility should use the 5520711F.

Q: What is the impact of the narrower 45° viewing angle on the H278CBC? A: The 45° viewing angle on the H278CBC is narrower than the 60° angle on the 5520711. This restricts the angular range over which the LED remains visible at full brightness. Applications requiring wide-angle visibility should use the 5520711F.

Q: Are both substitute parts RoHS compliant? A: Yes. Both the 5520711F and H278CBC are ROHS3 compliant. The original 5520711 is RoHS non-compliant. Designs requiring RoHS compliance must use either substitute part.

Q: What packaging options are available for these parts? A: The 5520711F is supplied in bulk packaging. The H278CBC is supplied in tray packaging. Packaging selection depends on production volume and handling requirements.

Q: Can the H278CBC be used in existing PCB designs without layout changes? A: Yes. The H278CBC maintains the same 5mm T-1 3/4 through-hole right-angle form factor and mounting footprint. PCB layout modifications are not required. However, circuit current-limiting resistor values must be recalculated to accommodate the 30mA operating current.