TE Connectivity 3-647648-4 Equivalent & Substitute Parts

Part Overview

The TE Connectivity 3-647648-4 is a rectangular connector header, through-hole mounted, with 4 positions at 0.156" (3.96mm) pitch. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design and procurement requirements. The connector features shrouded single-wall construction with friction lock fastening, suitable for general purpose and industrial applications. Substitute parts must maintain electrical and mechanical compatibility while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value
Manufacturer Part Number	3-647648-4
Manufacturer	TE Connectivity AMP Connectors
Category	Rectangular Connectors
Series	MTA-156
Product Status	Obsolete
Connector Type	Header
Contact Type	Male Pin
Pitch - Mating	0.156" (3.96mm)
Number of Positions	4
Number of Rows	1
Mounting Type	Through Hole
Termination	Solder
Shrouding	Shrouded - 1 Wall
Fastening Type	Friction Lock
Contact Length - Mating	0.450" (11.43mm)
Contact Length - Post	0.125" (3.18mm)
Overall Contact Length	0.700" (17.78mm)
Insulation Height	0.545" (13.84mm)
Contact Shape	Circular
Contact Finish - Mating	Tin
Contact Finish - Post	Tin
Contact Material	Copper Alloy
Insulation Material	Polyamide (PA), Nylon
Insulation Color	Black
Operating Temperature	-55°C ~ 105°C
Voltage Rating	600VAC
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitute parts for the TE Connectivity 3-647648-4 are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

Pitch - Mating: 0.156" (3.96mm)
Number of Positions: 4
Number of Rows: 1
Connector Type: Header
Contact Type: Male Pin
Mounting Type: Through Hole
Termination: Solder
Shrouding: Shrouded - 1 Wall
Fastening Type: Friction Lock
Contact Length - Mating: 0.450" (11.43mm)
Material Flammability Rating: UL94 V-0
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Considerations:

Contact Shape: Circular (main part) vs. Square (substitute parts) - functionally compatible within mating interface
Insulation Material: Polyamide/Nylon (main part) vs. Polyester/Glass Filled (substitute parts) - both meet flammability and environmental requirements
Contact Finish: Tin or Gold plating options available
Number of Positions Loaded: All positions or partial loading configurations

Molex KK396 series connectors meet all primary matching criteria and are classified as active products with current manufacturing support. Variations in contact finish, insulation material composition, and position loading accommodate different application requirements while maintaining electrical and mechanical compatibility.

Parameter Comparison

Parameter	3-647648-4 (TE)	0026604040 (Molex)	0026604042 (Molex)	0026606040 (Molex)	0026606042 (Molex)	0026614040 (Molex)	0026624041 (Molex)	0026624046 (Molex)	0026654040 (Molex)	0027624049 (Molex)
Manufacturer	TE Connectivity	Molex	Molex	Molex	Molex	Molex	Molex	Molex	Molex	Molex
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active
Connector Type	Header	Header	Header	Header	Header	Header	Header	Header	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Pitch - Mating	0.156" (3.96mm)	0.156" (3.96mm)	0.156" (3.96mm)	0.156" (3.96mm)	0.156" (3.96mm)	0.156" (3.96mm)	0.156" (3.96mm)	0.156" (3.96mm)	0.156" (3.96mm)	0.156" (3.96mm)
Number of Positions	4	4	4	4	4	4	4	4	4	4
Number of Rows	1	1	1	1	1	1	1	1	1	1
Number of Positions Loaded	All	All	All	All	All	All	2	3	All	3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Shrouding	Shrouded - 1 Wall	Shrouded - 1 Wall	Shrouded - 1 Wall	Shrouded - 1 Wall	Shrouded - 1 Wall	Shrouded - 1 Wall	Shrouded - 1 Wall	Shrouded - 1 Wall	Shrouded - 1 Wall	Shrouded - 1 Wall
Fastening Type	Friction Lock	Friction Lock	Friction Lock	Friction Lock	Friction Lock	Friction Lock	Friction Lock	Friction Lock	Friction Lock	Friction Lock
Contact Length - Mating	0.450" (11.43mm)	0.450" (11.43mm)	0.450" (11.43mm)	0.450" (11.43mm)	0.450" (11.43mm)	0.450" (11.43mm)	0.450" (11.43mm)	0.450" (11.43mm)	0.450" (11.43mm)	0.450" (11.43mm)
Contact Length - Post	0.125" (3.18mm)	0.140" (3.56mm)	0.140" (3.56mm)	0.140" (3.56mm)	0.140" (3.56mm)	0.140" (3.56mm)	0.140" (3.56mm)	0.140" (3.56mm)	0.140" (3.56mm)	0.140" (3.56mm)
Overall Contact Length	0.700" (17.78mm)	0.720" (18.29mm)	0.720" (18.29mm)	0.720" (18.29mm)	0.720" (18.29mm)	0.720" (18.29mm)	0.720" (18.29mm)	0.720" (18.29mm)	0.720" (18.29mm)	0.720" (18.29mm)
Insulation Height	0.545" (13.84mm)	0.446" (11.33mm)	0.446" (11.33mm)	0.446" (11.33mm)	0.446" (11.33mm)	0.446" (11.33mm)	0.446" (11.33mm)	0.446" (11.33mm)	0.446" (11.33mm)	0.446" (11.33mm)
Contact Shape	Circular	Square	Square	Square	Square	Square	Square	Square	Square	Square
Contact Finish - Mating	Tin	Tin	Tin	Tin	Gold	Gold	Tin	Gold	Gold	Tin
Contact Finish - Post	Tin	Tin	Tin	Tin	Tin	Tin	Tin	Tin	Tin	Tin
Insulation Material	Polyamide (PA), Nylon	Polyester, Glass Filled	Polyester, Glass Filled	Polyester, Glass Filled	Polyester, Glass Filled	Polyester, Glass Filled	Polyester, Glass Filled	Polyester, Glass Filled	Polyester	Polyester, Glass Filled
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All listed Molex substitute parts are classified as active products with current manufacturing support, providing supply chain continuity for applications currently using the obsolete TE Connectivity 3-647648-4. All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with current environmental and hazardous substance directives.

Selection by Application Requirements:

For General Purpose and Industrial Applications with Standard Tin Plating:

Molex 0026604040 (KK396, 41791 series)
Molex 0026604042 (KK396, 41791 series)
Molex 0026624041 (KK396, 41791 series, 2 positions loaded)
Molex 0026624046 (KK396, 41791 series, 3 positions loaded)
Molex 0027624049 (KK396, 41791 series, 3 positions loaded)

For Applications Requiring Enhanced Contact Reliability with Gold Plating:

Molex 0026606042 (KK396, 42891 series, with Board Lock feature)
Molex 0026614040 (KK396, 41791 series)
Molex 0026654040 (KK396, 42491 series, with Board Guide feature)

For Applications Requiring Board Lock Feature:

Molex 0026606040 (KK396, 42891 series, tin plating)
Molex 0026606042 (KK396, 42891 series, gold plating)

For Applications Requiring Board Guide Feature:

Molex 0026654040 (KK396, 42491 series)

All substitute parts meet the primary electrical and mechanical compatibility requirements. Contact post length variation (0.140" vs. 0.125" on original) and insulation height reduction (0.446" vs. 0.545") are within acceptable tolerances for standard PCB mounting applications. Contact shape difference (square vs. circular) does not affect mating interface performance within the 0.156" pitch specification.

Frequently Asked Questions (FAQ)

Q: Can Molex KK396 series connectors directly replace the TE Connectivity MTA-156 3-647648-4?

A: Yes. All listed Molex substitute parts maintain the critical mating parameters: 0.156" (3.96mm) pitch, 4-position single-row configuration, male pin contact type, through-hole solder termination, and friction lock fastening. The connectors are mechanically and electrically compatible for board-to-cable applications.

Q: What is the significance of the contact post length difference (0.125" vs. 0.140")?

A: The substitute parts feature a 0.015" (0.38mm) longer contact post. This variation accommodates standard PCB thickness tolerances and does not affect mating performance. The overall contact length remains within acceptable ranges for solder joint formation and mechanical retention.

Q: How does the insulation height reduction from 0.545" to 0.446" affect compatibility?

A: The reduced insulation height on Molex parts reflects modern connector design standards and does not compromise electrical isolation or mechanical integrity. The 0.099" (2.51mm) reduction is accommodated within standard PCB layout spacing for 0.156" pitch connectors.

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

A: Tin-plated contacts (0026604040, 0026604042, 0026624041, 0026624046, 0027624049) provide cost-effective performance for general purpose and industrial applications. Gold-plated contacts (0026606042, 0026614040, 0026654040) offer enhanced corrosion resistance and contact reliability for applications exposed to moisture, vibration, or demanding environmental conditions. Both finishes meet UL94 V-0 flammability requirements.

Q: What do the Board Lock and Board Guide features provide?

A: Board Lock feature (0026606040, 0026606042) provides mechanical retention to the PCB through integrated locking tabs, preventing accidental connector displacement. Board Guide feature (0026654040) provides alignment assistance during mating operations. These features are optional enhancements and do not affect basic electrical or mechanical compatibility.

Q: Are there differences in position loading configurations?

A: Yes. Most substitute parts are available with all 4 positions loaded. Variants with partial loading (0026624041 with 2 positions, 0026624046 and 0027624049 with 3 positions) accommodate applications requiring fewer active signal paths while maintaining the same connector footprint. Partial loading does not affect compatibility with fully-loaded mating connectors.

Q: Do all substitute parts meet the same compliance standards as the original?

A: Yes. All listed Molex substitute parts are ROHS3 compliant, REACH unaffected, and rated UL94 V-0 for material flammability. Moisture sensitivity level is 1 (Unlimited) for all parts, indicating no special handling requirements during storage or assembly.

Q: What is the difference between KK396 series variants (41791, 42891, 42491)?

A: These designations identify different connector series within the Molex KK396 family, reflecting variations in internal design, features, and manufacturing specifications. All variants maintain the 0.156" pitch and 4-position configuration. Series selection depends on specific application requirements for features such as Board Lock, Board Guide, or contact finish specifications.

Q: Can the circular contact shape of the original be directly compared to the square contact shape of substitutes?

A: Yes. Within the 0.156" (3.96mm) pitch specification, both circular and square contact geometries provide equivalent mating performance and electrical conductivity. The contact shape difference reflects manufacturing process variations between manufacturers and does not affect functional compatibility.

Q: What inventory levels are available for substitute parts?

A: Molex substitute parts maintain substantial inventory levels ranging from 715 to 13,889 pieces, ensuring supply chain continuity. The original TE Connectivity part, classified as obsolete, has limited remaining inventory of 938 pieces. Transition to active Molex alternatives is recommended for long-term design and procurement planning.

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