Dialight 5851421 LED Midget Flange Yellow 6V - Equivalent & Substitute Parts

Part Overview

The Dialight 5851421 is an LED-based yellow indicator lamp with midget flange base designed for 6V applications. This component functions as a direct replacement for incandescent midget flange base lamps in indicator light circuits. The part is classified as obsolete, making identification of active equivalent components essential for procurement and system maintenance. Substitute parts must maintain identical electrical and mechanical specifications to ensure proper circuit operation and physical compatibility.

Substiute Parts

5851421

DialightIn Stock: 8725851421 Datasheet

Current PartRFQ

5851411F

DialightIn Stock: 6525851411F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Dialight 5851421 is determined by the following critical parameters:

• Base Type: Must be Midget Flange to ensure physical compatibility with existing lamp sockets
• Size / Dimension: Must be T - 1 3/4 to fit within designated lamp housings
• Voltage - Forward (Vf): Must be 6V to operate within circuit design specifications
• Color: Must be Yellow (585nm wavelength) to maintain indicator function and visual consistency
• Configuration: Must be Single to match circuit requirements

The substitute part 5851411F meets all mandatory substitution criteria. This part is classified as active product status, providing long-term availability compared to the obsolete 5851421.

Parameter Comparison

Engineering Selection Recommendations

The Dialight 5851411F is the qualified substitute for the obsolete 5851421. Selection rationale is based on the following factors:

Product Status: The 5851421 is classified as obsolete, limiting future procurement availability. The 5851411F maintains active product status, ensuring continued supply chain access.

Compliance: The 5851411F achieves ROHS3 compliance, whereas the 5851421 is RoHS non-compliant. For applications subject to regulatory requirements, the 5851411F provides enhanced compliance posture.

Electrical Equivalence: Both parts operate at 6V forward voltage with identical wavelength (585nm) and configuration (Single). The 5851411F provides 22mcd brightness compared to 18mcd in the 5851421, representing a 22% increase in luminous intensity within the same form factor.

Mechanical Compatibility: Both parts utilize identical midget flange base type and T - 1 3/4 dimensions, ensuring direct physical interchangeability in existing lamp sockets.

Frequently Asked Questions (FAQ)

Q: Can the 5851411F directly replace the 5851421 in existing circuits?

A: Yes. Both parts share identical base type (Midget Flange), dimensions (T - 1 3/4), forward voltage (6V), color (Yellow), and wavelength (585nm). Direct substitution is electrically and mechanically compatible.

Q: What is the difference in brightness between these parts?

A: The 5851411F provides 22mcd compared to 18mcd in the 5851421. This represents a 22% increase in luminous intensity. Both parts maintain the same color and wavelength specifications.

Q: Why is the 5851421 listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The 5851411F is the active equivalent within the same product series, providing continued availability for new designs and replacements.

Q: Does the 5851411F meet current regulatory requirements?

A: The 5851411F is ROHS3 compliant and REACH unaffected. The 5851421 is RoHS non-compliant. For applications requiring regulatory compliance, the 5851411F is the appropriate selection.

Q: Are there packaging differences between these parts?

A: The 5851421 is listed with packaging designation "-" (not specified). The 5851411F is supplied in Bulk packaging. Confirm packaging requirements with your procurement specifications.