Dialight 5851321 LED Green Midget Flange 6V Equivalent & Substitute Parts

Part Overview

The Dialight 5851321 is an LED-based green indicator lamp with a midget flange base designed for 6V applications. This component functions as a direct replacement for incandescent midget flange base lamps in indicator light applications. The part is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing system maintenance and new design implementations. Substitute parts maintain the same mechanical interface, electrical specifications, and functional performance while offering improved availability and compliance status.

Substiute Parts

5851321

DialightIn Stock: 8165851321 Datasheet

Current PartRFQ

5851311F

DialightIn Stock: 10415851311F Datasheet

DirectRFQ

5861102001F

DialightIn Stock: 10245861102001F Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Dialight 5851321 is determined by the following critical parameters:

• Base Type: Must be Midget Flange to ensure mechanical compatibility with existing lamp sockets
• Size / Dimension: Must be T - 1 3/4 to fit within the physical envelope of the application
• Voltage - Forward (Vf): Must be 6V to maintain electrical compatibility with circuit design
• Color: Must be Green to preserve visual indication function
• Configuration: Must be Single to match the original electrical interface

The substitute parts listed below satisfy all these criteria. Additional parameters such as wavelength and millicandela rating may vary within acceptable ranges for the application category, as these represent performance characteristics rather than compatibility determinants.

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing applications: Select either 5851311F or 5861102001F as both parts are active products with ROHS3 compliance. The 5851321 is obsolete and should not be specified for new applications.

5851311F maintains identical wavelength (565nm) to the original 5851321, providing the closest optical match. This part is recommended when wavelength consistency is a design requirement.

5861102001F offers higher millicandela rating (600mcd versus 560mcd in the original), providing improved luminous intensity. The wavelength difference (520nm versus 565nm) represents a shift within the green spectrum. This part is suitable for applications where increased brightness is beneficial or acceptable.

Both substitute parts are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain stability compared to the obsolete 5851321.

Frequently Asked Questions (FAQ)

Q: Can 5851311F and 5861102001F be used interchangeably with 5851321?

A: Both parts satisfy the core compatibility parameters: midget flange base, T - 1 3/4 size, 6V forward voltage, green color, and single configuration. Selection between them depends on whether wavelength consistency (5851311F) or brightness level (5861102001F) is prioritized for the specific application.

Q: What is the difference between "Direct Manufacturer Part Number" and "Parametric Equivalent"?

A: 5851311F is a direct substitute with matching wavelength specification. 5861102001F is a parametric equivalent that meets all core compatibility requirements but with different wavelength and brightness characteristics. Both are valid substitutes based on the allowed electrical and mechanical parameters.

Q: Why is the 5851321 classified as obsolete?

A: Obsolete status indicates the part is no longer in active production. The active substitute parts 5851311F and 5861102001F provide equivalent functionality with improved compliance and availability.

Q: Are there packaging considerations when selecting a substitute?

A: The 5851321 packaging is listed as "-" (unspecified). Both substitute parts are available in bulk packaging, which is standard for LED lamp components. Confirm packaging requirements with your procurement process.

Q: Does RoHS compliance affect substitution eligibility?

A: The 5851321 is RoHS non-compliant, while both substitutes are ROHS3 compliant. For applications subject to RoHS regulations, the compliant substitutes are required. For legacy systems without RoHS requirements, either substitute remains functionally compatible.