LED Lamp Replacement Red Midget Flange 6V (5851121)

Part Overview

The Dialight 5851121 is an LED-based red 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 and general lighting applications. The part is classified as obsolete, making identification of compatible substitutes essential for system maintenance and component sourcing. The 5851121 operates at 6V forward voltage with a 630nm red wavelength output and 30mcd brightness rating in a T-1 3/4 form factor.

Substiute Parts

5851121

DialightIn Stock: 9435851121 Datasheet

Current PartRFQ

5851121F

DialightIn Stock: 8365851121F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5851121 is determined by the following critical parameters:

• Base Type: Midget Flange (mechanical compatibility requirement)
• Voltage - Forward (Vf): 6V (electrical compatibility requirement)
• Color: Red (functional requirement for indicator applications)
• Configuration: Single (form factor requirement)

The substitute part 5851121F meets all four critical substitution criteria. Both parts share identical base type, voltage rating, color specification, and single configuration. The 5851121F is an active product variant within the same Dialight 585 series, providing functional equivalence for applications requiring red midget flange base lamps at 6V operation.

Parameter Comparison

Engineering Selection Recommendations

The 5851121F is the direct substitute for the obsolete 5851121. Both components maintain identical electrical and mechanical specifications for midget flange base operation at 6V with red color output. The primary distinction is product status: the 5851121F is an active product, ensuring ongoing availability and supply chain continuity.

The 5851121F provides improved regulatory compliance through ROHS3 certification, whereas the original 5851121 is RoHS non-compliant. For new designs or systems requiring regulatory compliance with current environmental standards, the 5851121F is the appropriate selection. Both parts share identical REACH and ECCN classifications, maintaining equivalent export and regulatory treatment.

Frequently Asked Questions (FAQ)

Q: Can the 5851121F directly replace the 5851121 in existing applications?

A: Yes. Both parts share identical base type (midget flange), voltage rating (6V), color (red), and configuration (single). Mechanical and electrical compatibility is maintained for all applications originally designed for the 5851121.

Q: What is the primary reason to transition from 5851121 to 5851121F?

A: The 5851121 is classified as obsolete, creating supply and long-term availability concerns. The 5851121F is an active product within the same Dialight 585 series, providing equivalent functionality with assured supply continuity.

Q: Are there compliance differences between these parts?

A: The 5851121F meets ROHS3 compliance standards, while the 5851121 is RoHS non-compliant. For applications subject to environmental regulations or customer compliance requirements, the 5851121F is the appropriate choice. Both parts maintain identical REACH and export classification status.

Q: What packaging options are available?

A: The 5851121 is supplied in standard packaging. The 5851121F is available in bulk packaging format.

Q: Are the electrical characteristics identical between these parts?

A: Yes. Both parts operate at 6V forward voltage with red wavelength output (630nm) and single configuration. Moisture sensitivity level is identical at MSL 1 (unlimited).