TE Connectivity 748865-3 D-Sub Connector Equivalent & Substitute Parts

Part Overview

The TE Connectivity 748865-3 is a 25-position D-Sub plug connector with right-angle solder termination, part of the AMPLIMITE HD-20 series. This connector features male pins, through-hole mounting, and gold-plated brass contacts rated for 125V operation across a temperature range of -55°C to 105°C. The part is currently classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing applications and new designs.

Key Parameters

Parameter	Value
Connector Type	D-Sub Plug, Male Pins
Number of Positions	25
Number of Rows	2
Shell Size / Layout	3 (DB, B)
Mounting Type	Through Hole, Right Angle
Termination Method	Solder
Contact Finish	Gold
Contact Material	Brass
Backset Spacing	0.318" (8.08mm)
Voltage Rating	125V
Operating Temperature	-55°C to 105°C
Flammability Rating	UL94 V-0
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TE Connectivity 748865-3 is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Connector type: D-Sub plug with male pins
Position count: 25 positions
Row configuration: 2 rows
Shell size and layout: 3 (DB, B)
Mounting configuration: Through hole, right angle
Termination method: Solder
Backset spacing: 0.318" (8.08mm)
Contact finish: Gold plating
Flammability rating: UL94 V-0

Direct Equivalent: The TE Connectivity 5748865-3 is a direct equivalent with identical electrical and mechanical specifications. This part maintains active product status and RoHS compliance, distinguishing it from the obsolete 748865-3.

Compatible Substitutes: Mercury United Electronics 621-series connectors (621-025-260-011, 621-025-260-012, 621-025-260-013, 621-025-660-011, 621-025-660-012, 621-025-660-013, 621-025-660-043, 621-025-668-031, 621-025-668-032) share the core mechanical and electrical parameters required for functional substitution. These parts maintain the same 25-position, 2-row D-Sub configuration with right-angle solder termination and 0.318" backset spacing.

Parameter Comparison

Parameter	748865-3 (Main)	5748865-3 (Direct Equivalent)	621-025-260-011	621-025-260-012	621-025-260-013
Manufacturer	TE Connectivity	TE Connectivity	Mercury United Electronics	Mercury United Electronics	Mercury United Electronics
Connector Type	D-Sub Plug, Male Pins	D-Sub Plug, Male Pins	D-Sub Plug, Male Pins	D-Sub Plug, Male Pins	D-Sub Plug, Male Pins
Positions	25	25	25	25	25
Rows	2	2	2	2	2
Shell Size	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)	3 (DB, B)
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle	Board Edge, Through Hole, Right Angle	Board Edge, Through Hole, Right Angle	Board Edge, Through Hole, Right Angle
Termination	Solder	Solder	Solder	Solder	Solder
Backset Spacing	0.318" (8.08mm)	0.318" (8.08mm)	0.318" (8.08mm)	0.318" (8.08mm)	0.318" (8.08mm)
Contact Finish	Gold	Gold	Gold	Gold	Gold
Contact Material	Brass	Brass	Copper Alloy	Copper Alloy	Copper Alloy
Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Operating Temperature	-55°C to 105°C	-55°C to 105°C	-55°C to 85°C	-55°C to 85°C	-55°C to 85°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Selection: TE Connectivity 5748865-3

The TE Connectivity 5748865-3 is the recommended direct replacement for the obsolete 748865-3. This part maintains identical electrical and mechanical specifications while offering active product status and RoHS compliance. The 5748865-3 is available in tray packaging with 11,308 units in stock, ensuring supply continuity for production requirements.

Secondary Selection: Mercury United Electronics 621-Series

The Mercury United Electronics 621-series connectors (621-025-260-011, 621-025-260-012, 621-025-260-013, and related variants) provide functional substitution for applications where the primary equivalent is unavailable. These parts maintain core D-Sub 25-position specifications and are ROHS3 compliant. The 621-series offers multiple flange configurations and mounting options to accommodate various board layouts.

Compliance Considerations:

The TE Connectivity 5748865-3 achieves RoHS compliance, addressing regulatory requirements for new designs and production transitions. Mercury United Electronics 621-series parts are ROHS3 compliant and REACH unaffected, suitable for applications with stringent environmental compliance mandates.

Temperature Rating Variance:

Mercury United Electronics 621-series connectors operate within -55°C to 85°C, compared to the -55°C to 105°C range of the TE Connectivity parts. Applications requiring operation above 85°C must utilize TE Connectivity 5748865-3 or the original 748865-3.

Frequently Asked Questions (FAQ)

Q: Can the TE Connectivity 5748865-3 directly replace the obsolete 748865-3 without design modification?

A: Yes. The 5748865-3 maintains identical connector type, position count, shell size, mounting configuration, termination method, and backset spacing. No design modification is required for direct substitution.

Q: What are the key differences between TE Connectivity and Mercury United Electronics options?

A: The TE Connectivity 5748865-3 maintains the original operating temperature range of -55°C to 105°C and uses brass contacts. Mercury United Electronics 621-series connectors operate to 85°C maximum and use copper alloy contacts. Both maintain gold contact finish, UL94 V-0 flammability rating, and 25-position D-Sub configuration with 0.318" backset spacing.

Q: Are Mercury United Electronics 621-series connectors suitable for applications originally designed for the 748865-3?

A: Mercury United Electronics 621-series connectors are suitable for applications operating within -55°C to 85°C. Applications requiring the full -55°C to 105°C temperature range must use TE Connectivity 5748865-3. All parts share identical D-Sub 25-position specifications, shell size, mounting type, and solder termination.

Q: What packaging options are available for these substitutes?

A: The TE Connectivity 5748865-3 is supplied in tray packaging. Mercury United Electronics 621-series parts are available in bulk packaging. Packaging selection depends on production volume and inventory management requirements.

Q: Do all substitute parts meet the same flammability and compliance standards?

A: Yes. All listed substitutes maintain UL94 V-0 flammability rating. The TE Connectivity 5748865-3 is RoHS compliant. Mercury United Electronics 621-series parts are ROHS3 compliant and REACH unaffected, meeting current environmental regulatory requirements.

Q: Which Mercury United Electronics 621-series variant should be selected for a specific application?

A: Selection among 621-025-260-011, 621-025-260-012, 621-025-260-013, and related variants depends on flange configuration requirements. Part 621-025-260-011 features unthreaded housing flange. Part 621-025-260-012 features 4-40 threaded housing flange. Part 621-025-260-013 features mating-side female screwlock (4-40). Consult specific application mounting requirements to determine appropriate variant.

Q: Are there current rating differences between the main part and substitutes?

A: The TE Connectivity 748865-3 and 5748865-3 do not specify current rating. Mercury United Electronics 621-series connectors are rated at 3A per contact. Applications with defined current requirements should reference the 3A per contact specification for the 621-series.

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