TE Connectivity 640427-4 Rectangular Connector Equivalent & Substitute Parts

Part Overview

The TE Connectivity 640427-4 is a 4-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 tin-lead contact finish, a closed-end design, and free-hanging in-line mounting with locking ramp fastening.

The 640427-4 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	Rectangular Receptacle
Number of Positions	4
Pitch	0.156" (3.96mm)
Contact Type	Female Socket
Cable Termination Method	IDC
Wire Gauge	20 AWG
Mounting Type	Free Hanging (In-Line)
Fastening Type	Locking Ramp
Series	MTA-156

Substitute Part Grouping Explanation

Substitution eligibility for the 640427-4 is determined by strict equivalence across the following critical parameters:

Connector Type & Series: Must be rectangular receptacle from MTA-156 series
Position Count: Must be 4-position configuration
Pitch Specification: Must maintain 0.156" (3.96mm) pitch
Contact Configuration: Must be female socket contacts
Termination Method: Must support IDC termination
Wire Gauge Compatibility: Must accommodate 20 AWG wire
Mounting & Fastening: Must feature free-hanging in-line mounting with locking ramp fastening
Electrical & Mechanical Compatibility: Contact finish and finish thickness must be compatible with the original application requirements

The substitute part 3-640427-4 meets all these criteria and is therefore a direct functional equivalent.

Parameter Comparison

Parameter	640427-4 (Main Part)	3-640427-4 (Substitute)
Manufacturer	TE Connectivity AMP Connectors	TE Connectivity AMP Connectors
Series	MTA-156	MTA-156
Connector Type	Rectangular Receptacle	Rectangular Receptacle
Number of Positions	4	4
Contact Type	Female Socket	Female Socket
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	20 AWG	20 AWG
Features	Closed End	Closed End
Contact Finish	Tin-Lead	Tin
Contact Finish Thickness	80.0µin (2.03µm)	80.0µin (2.03µm)
Color	Yellow	Yellow
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	RoHS Compliant
ECCN	EAR99	EAR99
HTSUS	8536.69.8000	8536.69.8000

Engineering Selection Recommendations

The 3-640427-4 is the direct substitute for the obsolete 640427-4. Both connectors are manufactured by TE Connectivity and belong to the MTA-156 series with identical mechanical and electrical specifications across all critical parameters.

Product Status Consideration: The 640427-4 is obsolete, while the 3-640427-4 is active and currently in production. The substitute part maintains full compatibility with existing applications designed for the 640427-4.

Compliance Difference: The primary distinction between these parts is the contact finish specification and RoHS compliance status. The 640427-4 features tin-lead contact finish and is RoHS non-compliant. The 3-640427-4 features tin contact finish and is RoHS compliant. Both maintain identical contact finish thickness of 80.0µin (2.03µm).

Availability: The 3-640427-4 is available in active inventory with significantly higher stock levels (5770 pieces) compared to the obsolete 640427-4 (1073 pieces).

For new designs and ongoing production requirements, the 3-640427-4 is the appropriate selection. For legacy system maintenance where the original tin-lead finish specification is a documented requirement, the 640427-4 remains available while stock exists.

Frequently Asked Questions (FAQ)

Q: Can the 3-640427-4 be used as a direct replacement for the 640427-4 in existing applications?

A: Yes. The 3-640427-4 is mechanically and electrically equivalent to the 640427-4. Both connectors share identical pitch (0.156"), position count (4), contact type (female socket), termination method (IDC), wire gauge (20 AWG), mounting configuration (free-hanging in-line), and fastening type (locking ramp). The connectors are fully interchangeable in applications where the contact finish specification does not impose a constraint.

Q: What is the difference between the tin-lead finish on the 640427-4 and the tin finish on the 3-640427-4?

A: The 640427-4 specifies tin-lead contact finish, while the 3-640427-4 specifies tin contact finish. Both maintain the same finish thickness of 80.0µin (2.03µm). The contact finish thickness is the critical parameter for electrical performance and mechanical durability. Applications with specific finish material requirements should reference the original design documentation.

Q: Why is the 640427-4 classified as obsolete?

A: The 640427-4 is no longer in active production. The 3-640427-4 serves as the current production equivalent and is the recommended part for new designs and ongoing procurement.

Q: Are there packaging differences between the 640427-4 and 3-640427-4?

A: The 640427-4 packaging is not specified in the available data. The 3-640427-4 is supplied in bulk packaging. For specific packaging requirements, contact the manufacturer or authorized distributor.

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

A: Both the 640427-4 and 3-640427-4 have an MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Are both connectors RoHS compliant?

A: The 640427-4 is RoHS non-compliant. The 3-640427-4 is RoHS compliant. For applications subject to RoHS regulations, the 3-640427-4 is the appropriate selection.

Q: Can these connectors be used with both discrete and ribbon cable?

A: Yes. Both the 640427-4 and 3-640427-4 support discrete or ribbon cable termination via IDC method at 20 AWG wire gauge.

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