TE Connectivity 3-644381-2 Equivalent & Substitute Parts

Part Overview

The TE Connectivity 3-644381-2 is a 2-position rectangular receptacle connector from the MTA-156 series, designed for IDC (Insulation Displacement Contact) termination with 18 AWG wire. This connector features a tin contact finish, closed-end design, and polarizing key for secure mating. The part is classified as obsolete, necessitating identification of active equivalent alternatives to maintain design continuity and ensure supply chain availability for new production and field service applications.

Substiute Parts

3-644381-2

TE Connectivity AMP ConnectorsIn Stock: 8963-644381-2 Datasheet

Current PartRFQ

3-643817-2

TE Connectivity AMP ConnectorsIn Stock: 8623-643817-2 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3-644381-2 is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

• Connector type (Receptacle)
• Contact type (Female Socket)
• Number of positions (2)
• Pitch specification (0.156" / 3.96mm)
• Wire gauge compatibility (18 AWG)
• Cable termination method (IDC)

Mechanical Parameters:

• Mounting type (Free Hanging In-Line)
• Fastening type (Locking Ramp)
• Features (Closed End, Polarizing Key)

Material & Compliance Parameters:

• Contact finish (Tin)
• Contact finish thickness (80.0µin / 2.03µm)
• RoHS3 compliance
• Moisture Sensitivity Level (MSL 1 - Unlimited)

The substitute part 3-643817-2 maintains identical electrical and mechanical specifications, differing only in product status (Active vs. Obsolete), packaging format (Bulk), connector color (Orange vs. Black), and HTSUS classification. These differences do not affect functional interchangeability.

Parameter Comparison

Engineering Selection Recommendations

The 3-643817-2 is a direct functional equivalent to the 3-644381-2 for all electrical and mechanical applications. Selection of the substitute part is based on the following engineering criteria:

Product Status Consideration: The 3-644381-2 is classified as obsolete, while the 3-643817-2 maintains active product status. For new designs, production builds, and long-term field service support, the active substitute part ensures continued availability and manufacturer support.

Compliance & Certification: Both parts maintain identical ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings, confirming equivalent environmental and regulatory suitability across all applications.

Functional Interchangeability: Identical specifications across connector type, contact configuration, pitch, wire gauge, termination method, and contact finish ensure direct substitution without circuit redesign or assembly process modification.

Non-Critical Differences: Color variation (Black vs. Orange) and packaging format (unspecified vs. Bulk) do not affect electrical performance or mechanical compatibility. These attributes are cosmetic or logistical in nature.

Frequently Asked Questions (FAQ)

Q: Can the 3-643817-2 be used as a direct replacement for the 3-644381-2 in existing designs?

A: Yes. The 3-643817-2 is functionally equivalent across all electrical and mechanical parameters. No circuit redesign, PCB modification, or assembly process change is required for substitution.

Q: What is the primary reason for substituting the 3-644381-2?

A: The 3-644381-2 is classified as obsolete. The 3-643817-2 is an active product offering identical specifications with assured long-term availability and manufacturer support.

Q: Are there any compatibility concerns with mating connectors?

A: No. Both parts are MTA-156 series receptacles with identical pitch (0.156"), polarizing key design, and locking ramp fastening. They mate with the same plug connectors without modification.

Q: Does the color difference between the two parts affect performance?

A: No. Color is a cosmetic attribute and does not influence electrical performance, mechanical function, or environmental compliance.

Q: What wire gauges are compatible with both parts?

A: Both parts are specified for 18 AWG wire with IDC termination. Discrete or ribbon cable configurations are supported.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the 3-644381-2 and 3-643817-2 maintain ROHS3 compliance and are suitable for applications requiring environmental and regulatory adherence.

Q: What is the moisture sensitivity level for these connectors?

A: Both parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or deployment.

Q: Does packaging format affect the connector's electrical or mechanical properties?

A: No. Packaging format (Bulk vs. unspecified) is a supply chain and logistics consideration only. It does not alter connector performance or compatibility.