TE Connectivity 643821-2 Equivalent & Substitute Parts

Part Overview

The TE Connectivity 643821-2 is a 2-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 a tin-lead contact finish, closed-end design, and polarizing key for secure mating. The part is currently active in production with 841 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.

Key Parameters

Parameter	Value
Connector Type	Receptacle
Number of Positions	2
Pitch	0.156" (3.96mm)
Number of Rows	1
Contact Type	Female Socket
Cable Termination	IDC
Wire Gauge	26 AWG
Mounting Type	Free Hanging (In-Line)
Fastening Type	Locking Ramp
Features	Closed End, Polarizing Key
Contact Finish Thickness	80.0µin (2.03µm)
Color	Blue
Series	MTA-156
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TE Connectivity 643821-2 is determined by strict equivalence across the following critical parameters:

Mechanical Compatibility Parameters:

Connector type (Receptacle)
Number of positions (2)
Pitch spacing (0.156" / 3.96mm)
Number of rows (1)
Contact type (Female Socket)
Mounting type (Free Hanging In-Line)
Fastening type (Locking Ramp)

Electrical & Termination Parameters:

Cable termination method (IDC)
Wire gauge compatibility (26 AWG)
Wire type support (Discrete or Ribbon Cable)

Physical & Environmental Parameters:

Features (Closed End, Polarizing Key)
Contact finish thickness (80.0µin / 2.03µm)
Color (Blue)
Moisture Sensitivity Level (1 - Unlimited)

The substitute part 3-643821-2 maintains full equivalence across all mechanical, electrical, and environmental parameters. The primary distinction is the contact finish specification (tin versus tin-lead) and corresponding RoHS compliance status.

Parameter Comparison

Parameter	643821-2 (Main Part)	3-643821-2 (Substitute)
Manufacturer	TE Connectivity AMP Connectors	TE Connectivity AMP Connectors
Series	MTA-156	MTA-156
Connector Type	Receptacle	Receptacle
Number of Positions	2	2
Pitch	0.156" (3.96mm)	0.156" (3.96mm)
Number of Rows	1	1
Contact Type	Female Socket	Female Socket
Cable Termination	IDC	IDC
Wire Gauge	26 AWG	26 AWG
Wire Type	Discrete or Ribbon Cable	Discrete or Ribbon Cable
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)
Fastening Type	Locking Ramp	Locking Ramp
Features	Closed End, Polarizing Key	Closed End, Polarizing Key
Contact Finish Thickness	80.0µin (2.03µm)	80.0µin (2.03µm)
Color	Blue	Blue
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Contact Finish	Tin-Lead	Tin
RoHS Status	RoHS non-compliant	RoHS Compliant
Product Status	Active	Active
Inventory	841 Pcs	1528 Pcs

Engineering Selection Recommendations

Part 643821-2 (Tin-Lead Contact Finish):

Suitable for applications where RoHS non-compliance is acceptable or not required
Maintains active production status with established supply availability
Contact finish specification: Tin-Lead with 80.0µin thickness

Part 3-643821-2 (Tin Contact Finish):

Required for RoHS-compliant applications and manufacturing environments
Maintains full mechanical and electrical equivalence to the main part
Contact finish specification: Tin with 80.0µin thickness
Higher inventory availability (1528 pieces versus 841 pieces)
Recommended for new designs and applications subject to RoHS regulations

Both parts are manufactured by TE Connectivity AMP Connectors, share identical MTA-156 series specifications, and maintain equivalent performance across all mechanical, electrical, and environmental parameters. Selection between these parts is determined by compliance requirements and contact finish specifications rather than functional capability.

Frequently Asked Questions (FAQ)

Q: Are the 643821-2 and 3-643821-2 mechanically interchangeable?

A: Yes. Both parts are 2-position receptacle connectors with identical pitch (0.156"), mounting type (Free Hanging In-Line), fastening type (Locking Ramp), and feature set (Closed End, Polarizing Key). They mate with the same plug connectors and occupy identical PCB footprints.

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

A: The 643821-2 features a tin-lead contact finish, while the 3-643821-2 features a tin contact finish. Both maintain the same contact finish thickness of 80.0µin (2.03µm). The tin-lead version is RoHS non-compliant; the tin version is RoHS compliant.

Q: Which part should I specify for new designs?

A: Specify 3-643821-2 for new designs unless RoHS non-compliance is explicitly required. This part is RoHS compliant and maintains higher inventory availability.

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

A: No. Both parts support identical wire gauges (26 AWG), termination methods (IDC), and wire types (Discrete or Ribbon Cable). Electrical performance is equivalent.

Q: What is the Moisture Sensitivity Level for both parts?

A: Both parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.

Q: Can I use these connectors with ribbon cable?

A: Yes. Both parts support ribbon cable termination via IDC (Insulation Displacement Contact) method, in addition to discrete wire termination.

Q: What is the packaging difference between these parts?

A: The 643821-2 packaging is not specified in the data. The 3-643821-2 is supplied in Bulk packaging.

Q: Are both parts currently in production?

A: Yes. Both parts maintain Active product status with TE Connectivity AMP Connectors.

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