Molex 0387490121 Equivalent & Substitute Parts

Part Overview

The Molex 0387490121 is a 4-circuit barrier block connector with 0.438" (11.12mm) pitch, designed for chassis and panel mounting applications. It features screw termination on top and solder turret termination on bottom, rated for 15A at 300V with wire gauge compatibility of 14-22 AWG. The part is classified as obsolete, making identification of suitable substitutes essential for ongoing maintenance and new designs requiring equivalent functionality.

Substiute Parts

0387490121

MolexIn Stock: 10490387490121 Datasheet

Current PartRFQ

0387409104

MolexIn Stock: 8590387409104 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the Molex 0387490121 is determined by strict equivalence across the following critical parameters:

• Number of circuits: 4
• Pitch spacing: 0.438" (11.12mm)
• Current rating: 15A minimum
• Voltage rating: 300V minimum
• Wire gauge compatibility: 14-22 AWG
• Termination configuration: Screw top, solder turret bottom
• Barrier type: 2 Wall (Dual)
• Mounting type: Chassis and panel compatible
• Operating temperature range: -40°C ~ 100°C minimum
• Flammability rating: UL94 V-0
• RoHS compliance: ROHS3 Compliant

The substitute part must maintain identical electrical and mechanical specifications to ensure direct replacement without circuit redesign or mechanical modification.

Parameter Comparison

Engineering Selection Recommendations

The Molex 0387409104 is the manufacturer-recommended substitute for the obsolete 0387490121. Both parts maintain identical electrical ratings, mechanical dimensions, and termination configurations. The primary distinction is product status: the 0387409104 is active and currently in production, ensuring long-term availability and supply chain continuity.

From a compliance perspective, both parts meet ROHS3 requirements and UL94 V-0 flammability standards. The 0387409104 is available in bulk packaging with 793 units in stock, compared to the 0387490121 which has limited inventory of 1,026 units as an obsolete part.

For new designs or ongoing production requiring this connector type, the 0387409104 is the appropriate selection due to its active status and guaranteed availability.

Frequently Asked Questions (FAQ)

Q: Can the Molex 0387409104 directly replace the 0387490121 without modification?

A: Yes. Both parts share identical electrical specifications (15A, 300V), mechanical pitch (0.438"), circuit count (4), wire gauge compatibility (14-22 AWG), and termination methods (screw top, solder turret bottom). Direct substitution is possible without circuit or mechanical redesign.

Q: What is the primary reason for substituting the 0387490121?

A: The 0387490121 is classified as obsolete. The 0387409104 is the active equivalent, ensuring continued availability and supply chain reliability.

Q: Are there differences in insulation material between these parts?

A: The 0387490121 uses Polybutylene Terephthalate (PBT) and Polyester insulation, while the 0387409104 uses Thermoplastic insulation. Both materials meet UL94 V-0 flammability requirements and maintain equivalent electrical performance within the specified operating temperature range of -40°C to 100°C.

Q: What packaging options are available for the substitute part?

A: The 0387409104 is supplied in bulk packaging, with 793 units currently in stock.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the 0387490121 and 0387409104 are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8536.90.4000.