3M 3399-7626 Equivalent & Substitute Parts

Part Overview

The 3M 3399-7626 is a 26-position rectangular receptacle connector designed for IDC (Insulation Displacement Contact) termination with ribbon cable. This connector features a gold-plated contact finish, polarizing key, and strain relief, making it suitable for applications requiring reliable inline connections with 26-28 AWG ribbon cable. The part is active in production and RoHS3 compliant, with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained, allowing for component interchangeability in applications where the core functional requirements remain constant.

Key Parameters

Parameter	Value
Connector Type	Receptacle
Number of Positions	26
Pitch	0.100" (2.54mm)
Number of Rows	2
Row Spacing	0.100" (2.54mm)
Cable Termination	IDC
Wire Gauge	26-28 AWG
Wire Type	Ribbon Cable
Mounting Type	Free Hanging (In-Line)
Contact Finish	Gold
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 3M 3399-7626 is determined by strict equivalence across the following critical parameters:

Connector Configuration: 26-position receptacle with 2-row arrangement at 0.100" pitch and row spacing
Termination Method: IDC cable termination for 26-28 AWG ribbon cable
Mounting: Free hanging inline configuration
Contact Finish: Gold plating for corrosion resistance and electrical conductivity
Compliance: RoHS3 compliance and MSL 1 rating

The identified substitute parts (TE Connectivity 1658621-6 and 1658622-6) maintain these core electrical and mechanical parameters, enabling direct functional replacement in applications utilizing the 3M 3399-7626.

Parameter Comparison

Parameter	3M 3399-7626	TE Connectivity 1658621-6	TE Connectivity 1658622-6
Manufacturer	3M	TE Connectivity AMP Connectors	TE Connectivity AMP Connectors
Connector Type	Receptacle	Receptacle	Receptacle
Number of Positions	26	26	26
Pitch	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Number of Rows	2	2	2
Row Spacing	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Cable Termination	IDC	IDC	IDC
Wire Gauge	26-28 AWG	26-28 AWG	26-28 AWG
Wire Type	Ribbon Cable	Ribbon Cable	Ribbon Cable
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)	Free Hanging (In-Line)
Contact Finish	Gold	Gold	Gold or Gold-Palladium
Contact Finish Thickness	30.0µin (0.76µm)	15.0µin (0.38µm)	30.0µin (0.76µm)
Color	Gray	Black	Black
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three parts maintain active production status and comply with RoHS requirements, supporting long-term component availability. The 3M 3399-7626 features a contact finish thickness of 30.0µin (0.76µm) with strain relief and closed-end design. The TE Connectivity 1658621-6 provides equivalent functionality with a thinner contact finish (15.0µin / 0.38µm) and feed-through design in tube packaging. The TE Connectivity 1658622-6 matches the contact finish thickness specification (30.0µin / 0.76µm) with feed-through design and bulk packaging, offering flexibility in contact finish material (gold or gold-palladium).

Selection between these parts should be based on specific application requirements regarding contact finish thickness, mechanical design features (strain relief versus feed-through), and packaging format (bulk versus tube).

Frequently Asked Questions (FAQ)

Q: What determines if a part can substitute for the 3M 3399-7626?

A: Substitution requires equivalence in connector type (receptacle), position count (26), pitch (0.100"), row configuration (2 rows at 0.100" spacing), termination method (IDC), wire gauge compatibility (26-28 AWG), and contact finish material (gold). All identified substitutes meet these criteria.

Q: Are there differences in contact finish between the main part and substitutes?

A: Yes. The 3M 3399-7626 and TE Connectivity 1658622-6 both specify 30.0µin (0.76µm) contact finish thickness. The TE Connectivity 1658621-6 specifies 15.0µin (0.38µm). The 1658622-6 offers gold or gold-palladium finish options, while the others specify gold only.

Q: What is the difference between feed-through and strain relief designs?

A: The 3M 3399-7626 includes strain relief and closed-end design. The TE Connectivity substitutes feature feed-through design. Both configurations support IDC termination with ribbon cable; design selection depends on mechanical integration requirements.

Q: Do packaging differences affect electrical performance?

A: No. The 3M 3399-7626 is supplied in bulk packaging, the TE Connectivity 1658621-6 in tube packaging, and the 1658622-6 in bulk packaging. Packaging format does not affect connector electrical or mechanical performance.

Q: Are all parts RoHS compliant?

A: Yes. The 3M 3399-7626 and TE Connectivity 1658621-6 are ROHS3 compliant. The TE Connectivity 1658622-6 is RoHS compliant. All parts meet environmental compliance requirements.

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