3M 3440-6503UG Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The 3M 3440-6503UG is a shrouded rectangular connector header with 30 positions, 2.54mm pitch, designed for through-hole mounting with solder termination. This component features a 2-row configuration with gold-plated mating contacts and tin-lead plated posts. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	3440-6503UG
Manufacturer	3M
Category	Rectangular Connectors
Connector Type	Header
Contact Type	Male Pin
Number of Positions	30
Number of Rows	2
Pitch - Mating	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Shrouding	Shrouded - 4 Wall
Contact Finish - Mating	Gold
Contact Finish - Post	Tin-Lead
Operating Temperature Range	-55°C ~ 105°C
Current Rating	1A
Material Flammability Rating	UL94 V-0
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the 3M 3440-6503UG is determined by the following critical parameters:

Primary Compatibility Criteria:

Number of Positions: 30
Number of Rows: 2
Pitch - Mating: 0.100" (2.54mm)
Row Spacing - Mating: 0.100" (2.54mm)
Connector Type: Header
Contact Type: Male Pin
Mounting Type: Through Hole
Shrouding: Shrouded - 4 Wall
Termination: Solder

Secondary Compatibility Parameters:

Contact Finish - Mating: Gold
Contact Finish - Post: Tin or Tin-Lead
Contact Material: Copper Alloy
Insulation Material: PBT or PCT, Glass Filled
Material Flammability Rating: UL94 V-0
Operating Temperature Range: -55°C minimum and 105°C minimum

Substitute parts are grouped into two categories:

Category A - Direct 30-Position Substitutes:

3M N3440-6002RB (Active, RoHS Compliant)
HARTING 09185305914 (Active, ROHS3 Compliant)
HARTING 09185306902 (Active, ROHS3 Compliant)
HARTING 09185306914 (Active, ROHS3 Compliant)

Category B - Alternative Position Configurations:

HARTING 09185346322 (34 positions)
HARTING 09185347914 (34 positions)
HARTING 09195406324741 (40 positions)

Category B parts differ in position count and are suitable only for applications where the increased pin count does not create mechanical or electrical conflicts.

Parameter Comparison

Parameter	3440-6503UG (Main)	N3440-6002RB	09185305914	09185306902	09185306914
Manufacturer	3M	3M	HARTING	HARTING	HARTING
Number of Positions	30	30	30	30	30
Number of Rows	2	2	2	2	2
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall
Contact Finish - Mating	Gold	Gold	Gold	Gold	Gold
Contact Finish - Post	Tin-Lead	Tin	Tin	Tin	Tin
Contact Material	Copper Alloy	Copper Alloy	Copper Alloy	Copper Alloy	Copper Alloy
Insulation Material	PBT, Polyester, Glass Filled	PCT, Polyester, Glass Filled	PBT, Glass Filled	PBT, Glass Filled	PBT, Glass Filled
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Operating Temperature Range	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Current Rating	1A	1.75A	Not specified	Not specified	Not specified
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For RoHS-Compliant Applications: The 3M N3440-6002RB is the primary recommended substitute. It maintains full electrical and mechanical compatibility with the 3440-6503UG while offering RoHS compliance, active product status, and higher current rating (1.75A versus 1A). The insulation material differs (PCT versus PBT), but both meet UL94 V-0 flammability requirements and operate across the required temperature range.

For Extended Temperature Applications: HARTING 09185305914, 09185306902, and 09185306914 provide extended operating temperature range (-55°C ~ 125°C) and ROHS3 compliance. These parts are suitable for applications requiring thermal performance beyond the original specification. Fastening type variations exist among these options (Latch Lock/Eject Hooks, Short versus Long), which may affect mechanical fit in constrained mounting environments.

For Legacy Non-Compliant Designs: If RoHS compliance is not required and the original tin-lead post finish is critical, HARTING 09185305914 and 09185306914 maintain compatibility with the original contact finish specification while offering active product status and improved availability.

For Alternative Position Counts: HARTING 09185346322 (34 positions), 09185347914 (34 positions), and 09195406324741 (40 positions) are suitable only when the application can accommodate increased pin density without creating mechanical interference or electrical crosstalk concerns.

Frequently Asked Questions (FAQ)

Q: Can the 3M N3440-6002RB directly replace the 3440-6503UG without PCB redesign?

A: Yes. The N3440-6002RB maintains identical pitch (2.54mm), position count (30), row configuration (2), and mounting footprint. The primary difference is the fastening type (Push-Pull versus Latch Lock/Eject Hooks), which does not affect PCB-level compatibility. The higher current rating (1.75A) provides additional design margin.

Q: What is the impact of changing from tin-lead to tin post plating?

A: Tin post plating is compatible with standard solder reflow processes and provides equivalent electrical performance. The change reflects modern manufacturing practices and RoHS compliance requirements. No circuit-level modifications are required.

Q: Are HARTING parts mechanically interchangeable with the 3M original?

A: HARTING 09185305914, 09185306902, and 09185306914 are mechanically interchangeable for the 30-position configuration. Fastening type differences (Latch Lock/Eject Hooks, Short versus Long) may affect mating force and connector retention characteristics in specific applications. Verify mechanical fit in your specific connector housing assembly.

Q: Why do some substitute parts have unspecified current ratings?

A: Current rating specifications are not provided in the technical data for certain HARTING parts. This does not indicate reduced current capacity. For applications where current rating is critical, the 3M N3440-6002RB (1.75A) provides explicit specification.

Q: Can I use the 34-position or 40-position alternatives?

A: The 34-position (09185346322, 09185347914) and 40-position (09195406324741) alternatives are suitable only if your application design can accommodate the increased pin count without creating mechanical conflicts or unintended electrical connections. These are not drop-in replacements for 30-position designs.

Q: What is the difference between ROHS3 and RoHS compliance?

A: ROHS3 refers to compliance with the latest RoHS Directive 2011/65/EU as amended. Both RoHS Compliant and ROHS3 Compliant designations indicate lead-free manufacturing. ROHS3 represents the current regulatory standard.

Q: Is the extended temperature range (-55°C ~ 125°C) of HARTING parts a benefit or a concern?

A: Extended temperature range is a benefit. HARTING parts rated to 125°C provide additional thermal margin compared to the original 105°C specification. This allows use in higher-temperature environments without performance degradation.

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