TE Connectivity 749806-3 D-Sub 25 Position Receptacle Connector

Part Overview

The TE Connectivity 749806-3 is a 25 position D-Sub receptacle connector with female sockets, designed for crimp termination in the AMPLIMITE HDP-20 series. This connector features a shielded steel shell with tin plating, gold-flashed contacts, and operates across a temperature range of -55°C to 105°C with a 250V voltage rating.

The 749806-3 carries an obsolete product status. Identification of equivalent substitute parts is necessary to ensure continued availability for maintenance, repair, and new production applications where this connector type is specified.

Key Parameters

Parameter	Specification
Connector Style	D-Sub
Connector Type	Receptacle, Female Sockets
Number of Positions	25
Number of Rows	2
Shell Size, Connector Layout	3 (DB, B)
Mounting Type	Free Hanging (In-Line)
Termination Method	Crimp
Shell Material, Finish	Steel, Tin Plated
Contact Finish	Gold, Flash Thickness
Flange Feature	Cable Side, Male Short Screw (4-40)
Voltage Rating	250V
Operating Temperature Range	-55°C to 105°C
Dielectric Material	Polyamide (PA), Nylon, Glass Filled
Contact Material	Phosphor Bronze
Features	Shielded
Material Flammability Rating	UL94 V-0
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 749806-3 is determined by strict equivalence across all electrical and mechanical parameters. The substitute part must maintain identical specifications in the following critical areas:

Connector Architecture: D-Sub receptacle configuration with 25 positions arranged in 2 rows, shell size 3 (DB, B layout), and female socket contact type.

Termination and Mounting: Crimp termination method with free hanging in-line mounting and cable-side male short screw flange (4-40).

Material and Environmental Specifications: Steel shell with tin plating, gold-flashed phosphor bronze contacts, polyamide glass-filled dielectric, UL94 V-0 flammability rating, and -55°C to 105°C operating temperature range.

Electrical Performance: 250V voltage rating with shielded construction.

Series Designation: AMPLIMITE HDP-20 series classification.

The substitute part 749806-3 is functionally and mechanically interchangeable with 749806-9 based on these parameters.

Parameter Comparison

Parameter	749806-3 (Main Part)	749806-9 (Substitute)
Manufacturer	TE Connectivity AMP Connectors	TE Connectivity AMP Connectors
Series	AMPLIMITE HDP-20	AMPLIMITE HDP-20
Connector Style	D-Sub	D-Sub
Connector Type	Receptacle, Female Sockets	Receptacle, Female Sockets
Number of Positions	25	25
Number of Rows	2	2
Shell Size, Connector Layout	3 (DB, B)	3 (DB, B)
Mounting Type	Free Hanging (In-Line)	Free Hanging (In-Line)
Termination	Crimp	Crimp
Shell Material, Finish	Steel, Tin Plated	Steel, Tin Plated
Contact Finish	Gold, Flash	Gold, Flash
Flange Feature	Cable Side, Male Short Screw (4-40)	Cable Side, Male Short Screw (4-40)
Voltage Rating	250V	250V
Operating Temperature	-55°C to 105°C	-55°C to 105°C
Dielectric Material	Polyamide (PA), Nylon, Glass Filled	Polyamide (PA), Nylon, Glass Filled
Contact Material	Phosphor Bronze	Phosphor Bronze
Features	Shielded	Shielded
Material Flammability Rating	UL94 V-0	UL94 V-0
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	RoHS Compliant

Engineering Selection Recommendations

The 749806-3 is classified as obsolete. The substitute part 749806-9 is the direct equivalent, currently in active production status with improved regulatory compliance.

For New Designs and Production: Specify 749806-9. This part maintains full electrical and mechanical compatibility with 749806-3 while offering active product status and RoHS compliance.

For Maintenance and Repair Applications: The 749806-9 provides direct substitution for existing 749806-3 installations. All connector parameters, including pin configuration, shell dimensions, contact materials, and electrical ratings, are identical.

Regulatory Compliance Consideration: The 749806-9 is RoHS compliant, whereas the 749806-3 is RoHS non-compliant. Applications subject to RoHS requirements must transition to 749806-9.

Both parts carry identical ECCN (EAR99) and HTSUS classifications, ensuring consistent export and tariff treatment.

Frequently Asked Questions (FAQ)

Q: Can 749806-9 be used as a direct replacement for 749806-3 in existing assemblies?

A: Yes. The 749806-9 is electrically and mechanically identical to 749806-3. All connector parameters, including pin count, shell size, contact type, termination method, and electrical ratings, are equivalent. No design modifications are required.

Q: What is the primary difference between 749806-3 and 749806-9?

A: The 749806-3 is obsolete and RoHS non-compliant. The 749806-9 is in active production and RoHS compliant. All functional specifications remain identical.

Q: Are there packaging differences between these parts?

A: The 749806-3 packaging specification is not defined in available data. The 749806-9 is supplied in bulk packaging. Confirm packaging requirements with your procurement specification.

Q: Do both parts support the same crimp termination contacts?

A: Yes. Both 749806-3 and 749806-9 use crimp termination with phosphor bronze contacts finished in gold flash. Contact compatibility is identical.

Q: What is the operating temperature range for both connectors?

A: Both parts operate across -55°C to 105°C. Temperature performance is identical.

Q: Are both connectors shielded?

A: Yes. Both 749806-3 and 749806-9 feature shielded construction with steel shells and tin plating.

Q: What voltage rating applies to both parts?

A: Both connectors are rated for 250V operation.

Q: Is the flange configuration identical on both parts?

A: Yes. Both parts feature cable-side male short screw flanges with 4-40 screw specification.

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