LED Circuit Board Indicator 5681F1;1 Equivalent & Substitute Parts

Part Overview

The VCC 5681F1;1 is a bi-level red LED circuit board indicator designed for through-hole, right-angle mounting applications. This component features a 3mm T-1 lens with diffused, tinted optics and operates at 2V with a 30mA current rating, delivering 10mcd luminous intensity at a peak wavelength of 650nm.

The 5681F1;1 has reached obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

5681F1;1

Visual Communications Company - VCCIn Stock: 9925681F1;1 Datasheet

Current PartRFQ

5520811F

DialightIn Stock: 18955520811F Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5681F1;1 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Color: Red (x 2) configuration
• Peak Wavelength: 650nm
• Configuration: 2 High bi-level arrangement
• Mounting Type: Through Hole, Right Angle
• Lens Type: Diffused, Tinted optics
• RoHS3 Compliance
• MSL Rating: 1 (Unlimited)

Allowable Parameter Variations:

• Voltage Rating: 2V to 2.1V (within typical LED forward voltage tolerance)
• Current Rating: 20mA to 30mA (design-dependent; circuit must accommodate lower current draw)
• Millicandela Rating: 10mcd to 34mcd (brightness increase acceptable for indicator applications)
• Lens Size: 3mm T-1 to 5mm (mechanical fit dependent on PCB layout)
• Viewing Angle: Addition of specified viewing angle (50°) does not disqualify substitution

The Dialight 5520811F meets all primary compatibility criteria and falls within allowable parameter variations for this product category.

Parameter Comparison

Engineering Selection Recommendations

The Dialight 5520811F is a qualified substitute for the obsolete VCC 5681F1;1 based on the following engineering criteria:

Compliance & Regulatory: Both components maintain ROHS3 compliance and identical MSL ratings, ensuring regulatory continuity and manufacturing process compatibility.

Functional Equivalence: Both components share identical color, configuration, wavelength, lens type, and mounting orientation. The bi-level red LED indicator function is preserved.

Electrical Compatibility: The 5520811F operates at 2.1V versus the original 2V specification. This 0.1V difference falls within standard LED forward voltage tolerance and is acceptable for most circuit designs. However, circuit current-limiting design must be verified to accommodate the 20mA rating of the substitute versus the 30mA rating of the original component.

Optical Performance: The 5520811F delivers 34mcd compared to the original 10mcd. The increased brightness is functionally acceptable for circuit board indicator applications and does not introduce compatibility issues.

Supply Chain Status: The 5520811F is in active production with confirmed inventory availability (1842 pcs), providing long-term supply security compared to the obsolete status of the original component.

Frequently Asked Questions (FAQ)

Q: Can the Dialight 5520811F be used as a direct replacement for the VCC 5681F1;1?

A: The 5520811F is functionally equivalent for bi-level red LED indicator applications. Electrical circuit verification is required to confirm compatibility with the 2.1V forward voltage and 20mA current rating. Mechanical fit must be confirmed, as the 5520811F is specified as a 5mm component versus the original 3mm T-1 lens size.

Q: What is the significance of the voltage difference between 2V and 2.1V?

A: The 0.1V difference is within typical LED forward voltage tolerance and does not present a compatibility issue for most circuit designs. However, designs with tight voltage margins or specific current-limiting resistor calculations should be reviewed to ensure proper operation.

Q: Why does the substitute have a lower current rating (20mA vs. 30mA)?

A: The 5520811F is rated for 20mA maximum continuous current. Circuit designs must ensure that the current-limiting resistor or driver circuit does not exceed this rating. The lower current rating does not prevent substitution if the circuit is designed to operate within this specification.

Q: Does the higher brightness (34mcd vs. 10mcd) affect compatibility?

A: No. The increased brightness is acceptable for indicator applications and does not introduce compatibility issues. The component will function as a visual indicator with enhanced visibility.

Q: Are there mechanical considerations for substitution?

A: Yes. The 5520811F is specified as a 5mm component, while the original 5681F1;1 is 3mm T-1. PCB layout, mounting hole dimensions, and clearance must be verified before substitution. Consult mechanical drawings and component datasheets for precise dimensional specifications.

Q: Is the 5520811F available for immediate procurement?

A: Yes. The 5520811F is in active production status with confirmed inventory of 1842 pcs available, providing reliable supply chain access compared to the obsolete original component.