Molex 0399400508 Terminal Block Plug - Equivalent & Substitute Parts

Part Overview

The Molex 0399400508 is an 8-position terminal block plug with 5.08mm pitch, designed for barrier strip applications with 270° free-hanging (in-line) mounting. This component is actively manufactured and widely used in industrial control, power distribution, and signal routing applications. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when design requirements permit functional equivalents that meet the same electrical and mechanical specifications.

Substiute Parts

0399400508

MolexIn Stock: 11130399400508 Datasheet

Current PartRFQ

796861-8

TE Connectivity AMP ConnectorsIn Stock: 1344796861-8 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Molex 0399400508 is permissible when the replacement part meets the following critical parameters:

• Position Count: 8 positions (exact match required)
• Pitch: 0.200" (5.08mm) (exact match required)
• Wire Entry Angle: 270° (exact match required)
• Mounting Configuration: Free hanging (in-line) (exact match required)
• Current Rating: Minimum 15 A at UL rating
• Voltage Rating: Minimum 300 V at UL rating
• Contact Material: Phosphor Bronze
• RoHS Compliance: ROHS3 Compliant
• Wire Gauge Compatibility: Overlap within 12-22 AWG range

The TE Connectivity AMP Connectors 796861-8 satisfies these substitution criteria while introducing variations in termination style (screw rising cage clamp vs. captive plate), housing material (polyamide vs. thermoplastic), and operating temperature range (-40°C ~ 110°C vs. -40°C ~ 90°C).

Parameter Comparison

Engineering Selection Recommendations

The TE Connectivity AMP Connectors 796861-8 is a valid substitute for the Molex 0399400508 based on electrical and mechanical compatibility. Both components are ROHS3 compliant, active products with equivalent current and voltage ratings. The TE part provides an extended operating temperature range (-40°C ~ 110°C) and broader wire gauge acceptance (12-30 AWG), which may offer advantages in applications requiring higher temperature tolerance or greater wire size flexibility.

Key differences requiring design consideration:

• Termination Mechanism: The TE part uses a rising cage clamp design versus the Molex captive plate design. Both are screw-based termination methods suitable for field installation and maintenance.
• Screw Specifications: The TE part uses M3 screws with higher torque specification (0.79 Nm) compared to the Molex M4.6 screws (0.34 Nm). Installation procedures must reflect these differences.
• Housing Material: The TE part uses polyamide (PA66/Nylon 6/6) versus the Molex thermoplastic housing. Both materials provide adequate flammability and mechanical properties for the application.

Frequently Asked Questions (FAQ)

Q: Can the TE Connectivity 796861-8 be used as a direct replacement for the Molex 0399400508?

A: Yes, the TE Connectivity 796861-8 meets the critical substitution parameters: 8 positions, 5.08mm pitch, 270° wire entry, free-hanging mounting, 15 A current rating, and 300 V voltage rating. Both components use phosphor bronze contacts with tin mating finish and are ROHS3 compliant. Physical installation and electrical performance are compatible.

Q: What are the differences in termination between these two parts?

A: The Molex 0399400508 uses a screw-based termination with a captive plate design, while the TE Connectivity 796861-8 uses a screw-based rising cage clamp design. Both methods provide secure wire retention and are suitable for field termination. The TE part requires higher torque specification (0.79 Nm vs. 0.34 Nm).

Q: Are there wire gauge compatibility issues between these parts?

A: The Molex part accepts 12-22 AWG wire, while the TE part accepts 12-30 AWG wire. If your application uses wire within the 12-22 AWG range, both parts are fully compatible. The TE part offers broader gauge acceptance for applications requiring smaller gauge conductors.

Q: What is the impact of the different operating temperature ranges?

A: The Molex part operates from -40°C to 90°C, while the TE part operates from -40°C to 110°C. If your application requires operation above 90°C, the TE part provides extended temperature capability. For applications within the -40°C to 90°C range, both parts are suitable.

Q: Do the different screw sizes affect compatibility?

A: The Molex part uses M4.6 screws while the TE part uses M3 screws. These are different fastener sizes and require different installation tools and torque specifications. Ensure installation procedures and torque values are updated when substituting between these parts.

Q: Are both parts suitable for industrial control applications?

A: Yes, both the Molex 0399400508 and TE Connectivity 796861-8 are designed for industrial control, power distribution, and signal routing applications. Both meet UL voltage and current ratings and are ROHS3 compliant for regulatory compliance in industrial environments.