Dialight 5851221 LED Midget Flange Red 6V - Equivalent & Substitute Parts

Part Overview

The Dialight 5851221 is an LED-based lamp replacement designed for midget flange base applications operating at 6V. This component is classified as obsolete, making identification of suitable substitute parts essential for system maintenance and component sourcing. The 5851221 was engineered to replace incandescent indicator lamps in applications requiring red illumination at 660nm wavelength with a 50mcd output rating.

Substiute Parts

5851221

DialightIn Stock: 11615851221 Datasheet

Current PartRFQ

5851211F

DialightIn Stock: 11735851211F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the Dialight 5851221 is determined by the following critical parameters:

• Base Type: Midget Flange (mechanical interface requirement)
• Size / Dimension: T - 1 3/4 (physical form factor)
• Voltage - Forward (Vf): 6V (electrical operating requirement)
• Wavelength: 660nm (optical specification for red color)
• Configuration: Single (lamp configuration)

The substitute part 5851211F meets all mandatory substitution criteria. Both components share identical base type, physical dimensions, forward voltage, wavelength, and configuration specifications. The substitute part is sourced from the same manufacturer and series, ensuring mechanical and electrical compatibility within the specified application envelope.

Parameter Comparison

Engineering Selection Recommendations

The Dialight 5851211F is the direct substitute for the obsolete 5851221. Both components are manufactured by Dialight within the 585 series and maintain identical mechanical and electrical specifications for midget flange base applications at 6V operation.

The 5851211F offers the advantage of active product status, ensuring continued availability and supply chain reliability. Additionally, the 5851211F achieves ROHS3 compliance, whereas the 5851221 is RoHS non-compliant. The millicandela rating of the substitute (67mcd) exceeds that of the main part (50mcd), providing increased luminous intensity within the same form factor and electrical envelope.

Both components share identical moisture sensitivity classification (MSL 1 - Unlimited) and REACH status (REACH Unaffected), maintaining consistency in environmental handling and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the 5851211F directly replace the 5851221 in existing applications?

A: Yes. Both components share identical base type (Midget Flange), physical dimensions (T - 1 3/4), forward voltage (6V), wavelength (660nm), and configuration (Single). Mechanical and electrical compatibility is assured.

Q: What is the difference in millicandela rating between these parts?

A: The 5851221 is rated at 50mcd, while the 5851211F is rated at 67mcd. The substitute provides higher luminous intensity. Applications requiring specific brightness levels should account for this difference.

Q: Does the RoHS compliance difference affect substitution?

A: The 5851211F is ROHS3 compliant while the 5851221 is RoHS non-compliant. For new designs or systems with RoHS requirements, the 5851211F is the appropriate selection. Both components maintain identical REACH status (REACH Unaffected).

Q: Are there packaging differences between these parts?

A: The 5851221 is listed with packaging designation "-" while the 5851211F is supplied in Bulk packaging. Verify packaging requirements for your procurement process.

Q: Why is the 5851221 classified as obsolete?

A: The 5851221 is no longer in active production. The 5851211F serves as the active replacement within the Dialight 585 series, maintaining all critical electrical and mechanical specifications.