TE Connectivity 643821-5 Rectangular Connector Equivalent & Substitute Parts

Part Overview

The TE Connectivity 643821-5 is a 5-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 643821-5 is classified as obsolete. Locating equivalent substitute parts is necessary to support ongoing maintenance, repair, and production requirements for legacy systems utilizing this connector configuration.

Key Parameters

Parameter	Value
Connector Type	Receptacle
Number of Positions	5
Pitch	0.156" (3.96mm)
Series	MTA-156
Cable Termination Method	IDC
Wire Gauge	26 AWG
Contact Type	Female Socket
Mounting Type	Free Hanging (In-Line)
Number of Rows	1
Features	Closed End, Polarizing Key
Contact Finish Thickness	80.0µin (2.03µm)
Color	Blue
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 643821-5 is determined by strict equivalence across the following critical parameters:

Connector Type & Contact Configuration: Receptacle with female socket contacts
Position Count & Pitch: 5 positions at 0.156" (3.96mm) pitch
Series Designation: MTA-156 series
Termination Method: IDC cable termination
Wire Gauge Compatibility: 26 AWG
Mounting & Fastening: Free hanging in-line with locking ramp fastening
Mechanical Features: Closed end design with polarizing key
Contact Finish Thickness: 80.0µin (2.03µm)
Physical Appearance: Blue color

The substitute part 3-643821-5 meets all these criteria. The primary difference is the contact finish material (tin versus tin-lead) and product status (active versus obsolete).

Parameter Comparison

Parameter	643821-5 (Main Part)	3-643821-5 (Substitute)
Manufacturer	TE Connectivity AMP Connectors	TE Connectivity AMP Connectors
Series	MTA-156	MTA-156
Connector Type	Receptacle	Receptacle
Contact Type	Female Socket	Female Socket
Number of Positions	5	5
Pitch	0.156" (3.96mm)	0.156" (3.96mm)
Number of Rows	1	1
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)
Fastening Type	Locking Ramp	Locking Ramp
Cable Termination	IDC	IDC
Wire Type	Discrete or Ribbon Cable	Discrete or Ribbon Cable
Wire Gauge	26 AWG	26 AWG
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
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 3-643821-5 is the direct substitute for the obsolete 643821-5. Both connectors share identical mechanical, electrical, and dimensional specifications within the MTA-156 series.

Product Status Consideration: The 643821-5 is obsolete, while the 3-643821-5 is active. Selection of the active part ensures continued availability and supply chain support.

Compliance Consideration: The 643821-5 is RoHS non-compliant with tin-lead contact finish. The 3-643821-5 is ROHS3 compliant with tin contact finish. For applications subject to RoHS regulations or environmental compliance requirements, the 3-643821-5 is the appropriate selection. Both parts carry identical ECCN (EAR99) and HTSUS (8536.69.8000) classifications.

Contact Finish Difference: The substitution involves a change from tin-lead to tin contact finish. Both finishes maintain the specified 80.0µin (2.03µm) thickness and are compatible with IDC termination at 26 AWG. This material change reflects modern manufacturing standards and regulatory compliance.

Electrical & Mechanical Compatibility: All electrical ratings, mechanical dimensions, pitch, position count, mounting configuration, and fastening mechanisms are identical. The connectors are fully interchangeable in applications where the contact finish material change is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the 3-643821-5 directly replace the 643821-5 in existing assemblies?

A: Yes. The 3-643821-5 is mechanically and electrically identical to the 643821-5. Both connectors feature the same 5-position configuration, 0.156" pitch, IDC termination method, 26 AWG wire gauge, and mounting specifications. The connectors are fully interchangeable.

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

A: The 643821-5 uses tin-lead contact finish, while the 3-643821-5 uses tin contact finish. Both finishes are applied at 80.0µin (2.03µm) thickness and are compatible with IDC termination. The tin finish reflects current manufacturing standards and RoHS3 compliance requirements.

Q: Why is the 643821-5 classified as obsolete?

A: The 643821-5 is obsolete due to its tin-lead contact finish, which does not comply with RoHS regulations. The 3-643821-5 represents the current active equivalent with tin finish and ROHS3 compliance.

Q: Are there any performance differences between these connectors?

A: No. Both connectors meet identical electrical and mechanical specifications. Performance characteristics, contact resistance, current ratings, and environmental ratings are equivalent.

Q: What packaging is available for the 3-643821-5?

A: The 3-643821-5 is supplied in bulk packaging, as specified in the product data.

Q: Can I use these connectors with both discrete and ribbon cable?

A: Yes. Both the 643821-5 and 3-643821-5 support discrete or ribbon cable termination via IDC at 26 AWG wire gauge.

Q: Are both connectors suitable for applications requiring unlimited moisture exposure?

A: Yes. Both connectors carry Moisture Sensitivity Level (MSL) 1, indicating unlimited moisture tolerance.

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