TE Connectivity AMP Connectors 644370-3 Equivalent & Substitute Parts

Part Overview

The TE Connectivity AMP Connectors 644370-3 is a 3 Position Rectangular Receptacle Connector designed for IDC (Insulation Displacement Contact) termination with 20 AWG wire. This connector belongs to the MTA-156 series and features a tin-lead contact finish with closed-end design and locking ramp fastening. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued system support and new design implementations.

Substiute Parts

644370-3

TE Connectivity AMP ConnectorsIn Stock: 981644370-3 Datasheet

Current PartRFQ

3-644370-3

TE Connectivity AMP ConnectorsIn Stock: 11013-644370-3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 644370-3 with active alternatives is determined by strict equivalence across the following critical parameters:

Electrical Compatibility Parameters:

• Connector type (Receptacle)
• Number of positions (3)
• Contact type (Female Socket)
• Wire gauge (20 AWG)
• Cable termination method (IDC)

Mechanical Compatibility Parameters:

• Pitch spacing (0.156" / 3.96mm)
• Number of rows (1)
• Mounting type (Free Hanging In-Line)
• Fastening type (Locking Ramp)
• Series designation (MTA-156)
• Closed-end feature

Physical & Environmental Parameters:

• Contact finish thickness (80.0µin / 2.03µm)
• Color (Black)
• Moisture Sensitivity Level (1 - Unlimited)

The substitute part 3-644370-3 maintains complete equivalence across all electrical, mechanical, and environmental parameters. The primary distinction is the contact finish material (Tin versus Tin-Lead) and product status transition from obsolete to active.

Parameter Comparison

Engineering Selection Recommendations

The substitute part 3-644370-3 is the direct active equivalent for the obsolete 644370-3. Selection of this substitute is based on the following engineering criteria:

Product Status Transition: The main part 644370-3 carries obsolete status, limiting availability for new procurement and long-term supply chain reliability. The substitute 3-644370-3 maintains active product status with confirmed inventory availability (1057 pieces in stock versus 950 pieces for the obsolete part).

Regulatory Compliance: Both parts maintain RoHS compliance certifications. The main part carries ROHS3 Compliant status, while the substitute carries RoHS Compliant status. Both designations confirm lead-free or controlled lead content in accordance with applicable environmental regulations.

Electrical and Mechanical Equivalence: All critical parameters determining connector functionality and interchangeability are identical between the two parts. The 3-position, 0.156" pitch, IDC-terminated, 20 AWG receptacle configuration is preserved without modification.

Contact Finish Consideration: The primary technical difference is the contact finish material. The main part specifies Tin-Lead finish, while the substitute specifies Tin finish. Both finishes maintain the identical 80.0µin (2.03µm) thickness specification. This transition aligns with industry-wide movement toward lead-free contact materials and RoHS compliance requirements.

Moisture and Environmental Performance: Both parts maintain identical Moisture Sensitivity Level 1 (Unlimited) classification, confirming equivalent environmental performance characteristics across temperature and humidity conditions.

Frequently Asked Questions (FAQ)

Q: Can the 3-644370-3 substitute directly replace the 644370-3 in existing designs?

A: Yes. The 3-644370-3 maintains complete electrical and mechanical equivalence to the 644370-3 across all critical parameters including connector type, position count, pitch spacing, mounting configuration, and wire gauge. Direct substitution is supported without design modification.

Q: What is the significance of the contact finish difference between Tin-Lead and Tin?

A: The contact finish material does not affect electrical performance or mechanical compatibility. Both finishes provide equivalent contact resistance and durability at the specified 80.0µin (2.03µm) thickness. The transition from Tin-Lead to Tin reflects compliance with RoHS environmental regulations and industry standardization toward lead-free materials.

Q: Are there any compatibility issues with existing mating connectors?

A: No. The 3-644370-3 maintains identical pitch (0.156"), row configuration (1 row), and contact geometry to the 644370-3. Mating with existing MTA-156 series plugs and connectors is fully compatible.

Q: Why is the main part classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production and support for the 644370-3. The 3-644370-3 represents the active equivalent maintained in current production with ongoing supply chain support.

Q: What is the inventory status for the substitute part?

A: The 3-644370-3 is available with 1057 pieces in stock as new original inventory, providing immediate availability for procurement and implementation.

Q: Are both parts suitable for IDC termination with discrete or ribbon cable?

A: Yes. Both the 644370-3 and 3-644370-3 support IDC termination with discrete wire or ribbon cable at 20 AWG specification. The closed-end design and locking ramp fastening are identical across both parts.

Q: What environmental conditions are supported by the substitute part?

A: The 3-644370-3 maintains Moisture Sensitivity Level 1 (Unlimited) classification, indicating no moisture sensitivity restrictions. The connector operates across unlimited temperature and humidity conditions without special handling or storage requirements.