TE Connectivity 643821-6 Rectangular Connector Equivalent & Substitute Parts

Part Overview

The TE Connectivity 643821-6 is a 6-position rectangular receptacle connector from the MTA-156 series, designed for IDC (Insulation Displacement Contact) termination with 26 AWG discrete or ribbon cable. This connector features tin-lead contact finish, a polarizing key, and closed-end design for secure mating. The part is currently active in production with 842 pieces in stock.

Identification of equivalent and substitute parts is necessary to support procurement flexibility, manage supply chain continuity, and accommodate varying compliance requirements across different manufacturing environments and end-use applications.

Substiute Parts

643821-6

TE Connectivity AMP ConnectorsIn Stock: 862643821-6 Datasheet

Current PartRFQ

3-643821-6

TE Connectivity AMP ConnectorsIn Stock: 17933-643821-6 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The substitute part 3-643821-6 is functionally equivalent to the main part 643821-6 based on the following critical parameters that determine substitutability:

Matching Parameters:

• Series designation (MTA-156)
• Connector type and contact configuration (6-position receptacle, female socket)
• Pitch specification (0.156" / 3.96mm)
• Cable termination method (IDC)
• Wire gauge compatibility (26 AWG)
• Mechanical features (closed end, polarizing key, locking ramp fastening)
• Contact finish thickness (80.0µin / 2.03µm)
• Mounting type (free hanging, in-line)
• Moisture sensitivity level (MSL 1 - Unlimited)

Distinguishing Parameter:

• Contact finish material: The main part features tin-lead finish, while the substitute part features tin-only finish
• RoHS compliance status: Main part is RoHS non-compliant; substitute part is RoHS3 compliant

These differences do not affect mechanical or electrical compatibility for standard applications but reflect different manufacturing specifications and regulatory compliance postures.

Parameter Comparison

Engineering Selection Recommendations

For RoHS3-Compliant Applications: Select part number 3-643821-6. This substitute part meets RoHS3 compliance requirements while maintaining full mechanical and electrical compatibility with the main part. The tin-only contact finish is compliant with lead-free manufacturing directives.

For Non-Compliant or Legacy Applications: Part number 643821-6 remains available with tin-lead contact finish. Selection of this part is appropriate for applications where RoHS compliance is not a requirement or where legacy specifications mandate tin-lead contact materials.

For Supply Chain Continuity: Part number 3-643821-6 offers significantly higher inventory availability (1704 pieces versus 842 pieces), supporting procurement planning and reducing lead time risk for high-volume production schedules.

Both parts are active products from TE Connectivity AMP Connectors and carry identical ECCN and HTSUS classifications, ensuring consistent regulatory treatment across procurement and logistics workflows.

Frequently Asked Questions (FAQ)

Q: Are parts 643821-6 and 3-643821-6 mechanically interchangeable?

A: Yes. Both parts share identical mechanical specifications including connector type, position count, pitch, mounting configuration, and fastening method. They are direct mechanical substitutes within the MTA-156 series.

Q: What is the functional difference between tin-lead and tin contact finishes?

A: Contact finish material does not affect electrical performance or mechanical mating characteristics. The primary distinction is regulatory compliance: tin-lead finish is non-compliant with RoHS3 directives, while tin-only finish is RoHS3 compliant. Both finishes provide equivalent contact resistance and durability for standard applications.

Q: Can I use 3-643821-6 as a direct replacement for 643821-6 in existing designs?

A: Yes, provided your application does not explicitly require tin-lead contact finish or non-compliant material specifications. The substitute part maintains full compatibility with IDC termination tooling, mating connectors, and cable specifications.

Q: Does the contact finish thickness differ between these parts?

A: No. Both parts specify identical contact finish thickness of 80.0µin (2.03µm), ensuring equivalent wear resistance and contact durability.

Q: What is the significance of the base product number 643821?

A: The base product number 643821 identifies the core connector design within the MTA-156 series. The suffix "-6" designates the 6-position configuration. Both parts share this base design, confirming their functional equivalence.

Q: Are there packaging differences between these parts?

A: The main part 643821-6 is supplied in standard packaging, while substitute part 3-643821-6 is supplied in bulk packaging. Both are new original stock from TE Connectivity.

Q: Which part should I specify for new designs?

A: For new designs, specify part number 3-643821-6 to ensure RoHS3 compliance and benefit from higher inventory availability. This part meets current regulatory requirements and supports long-term supply chain stability.

Q: Are both parts suitable for ribbon cable and discrete wire termination?

A: Yes. Both parts support IDC termination for discrete or ribbon cable at 26 AWG wire gauge, with identical locking ramp fastening and polarizing key features.