TE Connectivity 643820-3 Rectangular Connector Equivalent & Substitute Parts

Part Overview

The TE Connectivity 643820-3 is a 3-position rectangular receptacle connector from the MTA-156 series, designed for IDC (Insulation Displacement Contact) termination with 24 AWG discrete or ribbon cable. This connector features a tin-lead contact finish, closed-end design, and polarizing key for secure mating. The part is currently active in production with 955 pieces in stock.

Identification of equivalent and substitute parts is necessary to address supply chain requirements, inventory optimization, and compliance considerations. The primary substitute maintains identical electrical and mechanical specifications while offering improved regulatory compliance and higher stock availability.

Substiute Parts

643820-3

TE Connectivity AMP ConnectorsIn Stock: 1028643820-3 Datasheet

Current PartRFQ

3-643820-3

TE Connectivity AMP ConnectorsIn Stock: 33033-643820-3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution between the main part (643820-3) and the equivalent part (3-643820-3) is valid based on the following criteria:

Identical Electrical and Mechanical Parameters:

• Both connectors are 3-position receptacles in the MTA-156 series
• Pitch specification of 0.156" (3.96mm) is identical
• IDC cable termination method is identical
• 24 AWG wire gauge specification is identical
• Contact finish thickness of 80.0µin (2.03µm) is identical
• Closed-end design with polarizing key is identical
• Free hanging in-line mounting configuration is identical
• Locking ramp fastening type is identical

Allowable Variation:

• Contact finish differs between tin-lead (643820-3) and tin (3-643820-3), both acceptable for this connector category
• RoHS compliance status differs; the substitute (3-643820-3) is RoHS compliant while the main part is non-compliant
• Packaging differs; the substitute is supplied in bulk format

These parts are functionally interchangeable in applications where the specified electrical and mechanical parameters are required.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection Criteria:

The substitute part 3-643820-3 is the preferred selection for new designs and procurement when RoHS compliance is required. This part maintains full electrical and mechanical compatibility with the main part 643820-3 while providing RoHS compliant status and significantly higher inventory availability (3279 pieces versus 955 pieces).

Compliance Considerations:

• Part 643820-3 is RoHS non-compliant and REACH affected
• Part 3-643820-3 is RoHS compliant with undefined REACH status
• Both parts carry EAR99 ECCN classification and identical HTSUS code 8536.69.8000

Contact Finish Selection:

Both tin-lead and tin contact finishes are acceptable for this connector category. The tin finish in the substitute part (3-643820-3) provides equivalent electrical performance and environmental resistance at the specified 80.0µin (2.03µm) thickness.

Packaging and Availability:

The substitute part is supplied in bulk packaging format with substantially higher stock levels, supporting both immediate availability and long-term supply chain stability.

Frequently Asked Questions (FAQ)

Q: Are these connectors mechanically interchangeable?

A: Yes. Both the main part 643820-3 and substitute part 3-643820-3 share identical mechanical specifications including pitch (0.156"), mounting type (free hanging in-line), fastening type (locking ramp), and connector geometry. They mate with identical plug connectors and occupy the same physical space.

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

A: Both finishes are applied at 80.0µin (2.03µm) thickness and provide equivalent electrical conductivity and environmental resistance for this connector application. The tin finish in part 3-643820-3 is the modern standard, while the tin-lead finish in part 643820-3 represents an earlier specification. Both are functionally equivalent for IDC termination with 24 AWG cable.

Q: Can I use part 3-643820-3 as a direct replacement for 643820-3?

A: Yes. Part 3-643820-3 is a direct functional equivalent. It maintains identical electrical and mechanical specifications and is compatible with all applications designed for part 643820-3. The primary difference is improved RoHS compliance status and higher stock availability.

Q: What does IDC termination mean?

A: IDC (Insulation Displacement Contact) termination is a cable connection method where the connector contacts pierce through the cable insulation to make electrical contact with the conductor. Both parts support IDC termination with discrete or ribbon cable at 24 AWG wire gauge.

Q: Why is the substitute part in bulk packaging?

A: Bulk packaging reduces per-unit cost and is standard for high-volume applications. The substitute part 3-643820-3 is supplied in bulk format, which is typical for active production parts with higher inventory levels.

Q: Are there any electrical performance differences between these parts?

A: No. Both parts are rated for identical electrical specifications including contact finish thickness, wire gauge capacity, and current-carrying capability. They perform identically in circuit applications.

Q: What is the Moisture Sensitivity Level (MSL) for these connectors?

A: Both parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. These connectors can be stored and handled under standard conditions without special moisture control requirements.