Molex 0399400503 Terminal Block Plug - Equivalent & Substitute Parts

Part Overview

The Molex 0399400503 is a 3-position terminal block plug with 0.200" (5.08mm) pitch spacing, designed for barrier strip applications with 270° free-hanging in-line mounting. This component is part of the EuroMate 39940 series and is currently active in production. The part operates at 15 A (UL) and 300 V (UL) with screw termination featuring a captive plate. Finding equivalent or substitute parts may be necessary due to inventory constraints, supply chain considerations, or specific application requirements that demand alternative contact configurations or housing materials.

Substiute Parts

0399400503

MolexIn Stock: 11090399400503 Datasheet

Current PartRFQ

796861-3

TE Connectivity AMP ConnectorsIn Stock: 794796861-3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The TE Connectivity AMP Connectors 796861-3 qualifies as a substitute for the Molex 0399400503 based on the following critical parameters:

Matching Parameters:

• 3-position configuration
• 0.200" (5.08mm) pitch spacing
• 270° free-hanging in-line wire entry
• 15 A current rating (UL)
• 300 V voltage rating (UL)
• Phosphor bronze contact material
• Tin contact mating finish
• Mating flange feature
• ROHS3 compliance
• Unlimited moisture sensitivity level (MSL 1)

Allowable Variations: The 796861-3 differs in contact configuration (female sockets versus barrier strip), housing material (polyamide/nylon versus thermoplastic), termination method (rising cage clamp versus screw with captive plate), and operating temperature range (-40°C ~ 110°C versus -40°C ~ 90°C). These variations remain within acceptable substitution parameters for applications requiring equivalent electrical performance and mechanical compatibility at the specified pitch and position count.

Parameter Comparison

Engineering Selection Recommendations

Both the Molex 0399400503 and TE Connectivity 796861-3 maintain active product status and full ROHS3 compliance, making either suitable for new designs and production applications. The selection between these parts should be based on specific termination requirements: the Molex part employs a screw with captive plate mechanism, while the TE Connectivity part uses a rising cage clamp system. The TE Connectivity 796861-3 offers an extended operating temperature range to 110°C and accepts a broader wire gauge range (12-30 AWG), providing additional flexibility for applications with varying thermal or wire size requirements. Both parts share identical electrical ratings, pitch spacing, and mounting configuration, ensuring mechanical and electrical interchangeability within the specified parameters.

Frequently Asked Questions (FAQ)

Q: Can the TE Connectivity 796861-3 directly replace the Molex 0399400503 in existing designs?

A: Direct replacement is possible when the application tolerates differences in termination method (rising cage clamp versus screw with captive plate) and housing material (polyamide versus thermoplastic). Both parts maintain identical pitch, position count, wire entry angle, and electrical ratings. Verify that the termination style change does not conflict with existing assembly procedures or mechanical constraints.

Q: What is the significance of the wire gauge range difference?

A: The Molex 0399400503 accepts 12-22 AWG wire, while the TE Connectivity 796861-3 accepts 12-30 AWG. The TE part accommodates smaller gauge conductors, offering flexibility for applications requiring finer wire sizes. For applications using only 12-22 AWG wire, both parts perform identically.

Q: How do the termination methods differ functionally?

A: The Molex part uses a screw with captive plate for wire termination, while the TE Connectivity part employs a rising cage clamp system. Both methods provide secure electrical connection and are suitable for screw-based termination applications. The choice depends on assembly equipment compatibility and operator preference.

Q: Are both parts suitable for high-temperature applications?

A: The Molex 0399400503 operates to 90°C, while the TE Connectivity 796861-3 extends to 110°C. For applications exceeding 90°C, the TE Connectivity part provides additional thermal margin. Both parts maintain performance within their specified temperature ranges.

Q: Do packaging and inventory considerations affect substitution?

A: Both parts are available in bulk packaging. Current inventory shows 1089 pcs for the Molex part and 729 pcs for the TE Connectivity part. Substitution decisions may be influenced by availability, lead time, and supply chain requirements specific to your procurement timeline.