TE Connectivity 643818-2 Rectangular Connector Equivalent & Substitute Parts

Part Overview

The TE Connectivity 643818-2 is a 2-position rectangular receptacle connector from the MTA-156 series, designed for IDC (Insulation Displacement Contact) termination with 20 AWG discrete or ribbon cable. This connector features a tin-lead contact finish, closed-end design with polarizing key, and free-hanging in-line mounting configuration. The part is currently active in production with 771 pieces in stock inventory.

Substitute parts are identified to address specific application requirements including RoHS compliance status, contact finish specifications, and packaging configurations while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Criticality for Substitution
Connector Type	Receptacle	Critical
Number of Positions	2	Critical
Pitch	0.156" (3.96mm)	Critical
Series	MTA-156	Critical
Cable Termination Method	IDC	Critical
Wire Gauge	20 AWG	Critical
Contact Type	Female Socket	Critical
Number of Rows	1	Critical
Mounting Type	Free Hanging (In-Line)	Critical
Fastening Type	Locking Ramp	Critical
Contact Finish	Tin-Lead or Tin	Application-Dependent
RoHS Status	Compliant or Non-Compliant	Regulatory
Contact Finish Thickness	80.0µin (2.03µm)	Performance

Substitute Part Grouping Explanation

Substitution between TE Connectivity 643818-2 and 3-643818-2 is valid based on matching electrical and mechanical parameters. Both parts maintain identical specifications for:

Connector type (Receptacle)
Position count (2 positions)
Pitch spacing (0.156" / 3.96mm)
Series designation (MTA-156)
IDC cable termination method
Wire gauge compatibility (20 AWG)
Contact type (Female Socket)
Row configuration (1 row)
Mounting method (Free Hanging In-Line)
Fastening mechanism (Locking Ramp)
Contact finish thickness (80.0µin / 2.03µm)
Moisture sensitivity level (MSL 1 - Unlimited)

The primary differences between these parts are contact finish composition (tin-lead versus tin) and RoHS compliance status, which are application-specific selection criteria rather than compatibility barriers.

Parameter Comparison

Parameter	643818-2	3-643818-2	Match Status
Manufacturer	TE Connectivity AMP Connectors	TE Connectivity AMP Connectors	Identical
Series	MTA-156	MTA-156	Identical
Connector Type	Receptacle	Receptacle	Identical
Contact Type	Female Socket	Female Socket	Identical
Number of Positions	2	2	Identical
Pitch	0.156" (3.96mm)	0.156" (3.96mm)	Identical
Number of Rows	1	1	Identical
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)	Identical
Fastening Type	Locking Ramp	Locking Ramp	Identical
Cable Termination	IDC	IDC	Identical
Wire Type	Discrete or Ribbon Cable	Discrete or Ribbon Cable	Identical
Wire Gauge	20 AWG	20 AWG	Identical
Features	Closed End, Polarizing Key	Closed End, Polarizing Key	Identical
Contact Finish Thickness	80.0µin (2.03µm)	80.0µin (2.03µm)	Identical
Color	Yellow	Yellow	Identical
MSL Rating	1 (Unlimited)	1 (Unlimited)	Identical
ECCN	EAR99	EAR99	Identical
HTSUS Code	8536.69.8000	8536.69.8000	Identical
Contact Finish	Tin-Lead	Tin	Different
RoHS Status	RoHS Non-Compliant	RoHS Compliant	Different
Packaging	Not Specified	Bulk	Different
Product Status	Active	Active	Identical

Engineering Selection Recommendations

643818-2 (Tin-Lead Contact Finish, RoHS Non-Compliant)

Select this part for applications where tin-lead contact finish is specified or required. This part is suitable for legacy systems, military applications, or designs where RoHS compliance is not mandated. The part maintains active production status with established supply availability.

3-643818-2 (Tin Contact Finish, RoHS Compliant)

Select this part for applications requiring RoHS compliance or where lead-free contact finish is specified. This variant is suitable for commercial, industrial, and consumer applications subject to RoHS regulations. The tin contact finish provides equivalent electrical performance with identical contact finish thickness. Higher inventory availability (8940 pieces) supports production requirements. Bulk packaging configuration is standard for this variant.

Both parts are active products from TE Connectivity with identical mechanical and electrical specifications. Selection between them is determined by regulatory compliance requirements and contact finish material specifications for the target application.

Frequently Asked Questions (FAQ)

Q: Are 643818-2 and 3-643818-2 mechanically interchangeable?

A: Yes. Both parts share identical mechanical specifications including connector type, position count, pitch spacing, mounting configuration, and fastening mechanism. Physical dimensions and mating interfaces are equivalent.

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

A: The 643818-2 features a tin-lead contact finish, while the 3-643818-2 features a tin (lead-free) contact finish. Both maintain the same contact finish thickness of 80.0µin (2.03µm). The selection between them is determined by application requirements and regulatory compliance mandates.

Q: Can I use 3-643818-2 as a direct replacement for 643818-2 in RoHS-compliant applications?

A: Yes. The 3-643818-2 is RoHS compliant and maintains all electrical and mechanical compatibility with 643818-2. It is suitable for applications requiring RoHS compliance.

Q: What is the significance of the packaging difference between these parts?

A: The 643818-2 packaging is not specified in available documentation. The 3-643818-2 is supplied in bulk packaging. Packaging configuration affects order quantities and handling procedures but does not impact connector performance or compatibility.

Q: Are both parts suitable for IDC termination with 20 AWG cable?

A: Yes. Both 643818-2 and 3-643818-2 are designed for IDC termination with 20 AWG discrete or ribbon cable. The IDC termination method and wire gauge specifications are identical.

Q: What is the moisture sensitivity level for these connectors?

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

Q: Can these connectors be used with ribbon cable?

A: Yes. Both parts support discrete or ribbon cable configurations with 20 AWG wire gauge.

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