3M 3440-5603 Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The 3M 3440-5603 is a through-hole, right-angle rectangular connector header with 30 positions at 2.54mm pitch. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design and procurement requirements. The connector features shrouded 4-wall construction with solder termination and is suitable for board-to-cable/wire applications requiring reliable mating cycles and environmental stability across industrial temperature ranges.

Key Parameters

Parameter	Value
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, Right Angle
Shrouding	Shrouded - 4 Wall
Termination	Solder
Operating Temperature Range	-55°C ~ 105°C
Current Rating	1.75A
Material Flammability Rating	UL94 V-0

Substitute Part Grouping Explanation

Substitution of the 3M 3440-5603 is based on strict equivalence across the following critical parameters:

Connector type (Header) and contact type (Male Pin)
Position count (30) and row configuration (2 rows)
Mating pitch and row spacing (0.100" / 2.54mm)
Mounting method (Through Hole, Right Angle)
Shrouding configuration (Shrouded - 4 Wall)
Termination method (Solder)
Operating temperature range (-55°C ~ 105°C)
Current rating (1.75A)
Flammability rating (UL94 V-0)
Insulation material (PCT Polyester, Glass Filled)

The substitute part N3440-5002RB meets all these criteria and is classified as active product status, making it a direct functional equivalent for the obsolete 3440-5603.

Parameter Comparison

Parameter	3440-5603 (Main Part)	N3440-5002RB (Substitute)
Manufacturer	3M	3M
Product Status	Obsolete	Active
Connector Type	Header	Header
Contact Type	Male Pin	Male Pin
Number of Positions	30	30
Number of Rows	2	2
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)	0.100" (2.54mm)
Mounting Type	Through Hole, Right Angle	Through Hole, Right Angle
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall
Termination	Solder	Solder
Contact Length - Mating	0.240" (6.10mm)	0.240" (6.10mm)
Insulation Height	0.340" (8.64mm)	0.340" (8.64mm)
Contact Shape	Square	Square
Contact Finish - Mating	Gold	Gold
Contact Finish Thickness - Mating	30.0µin (0.76µm)	30.0µin (0.76µm)
Contact Material	Copper Alloy	Copper Alloy
Insulation Material	PCT Polyester, Glass Filled	PCT Polyester, Glass Filled
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C
Material Flammability Rating	UL94 V-0	UL94 V-0
Current Rating	1.75A	1.75A
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99
HTSUS Code	8536.69.4040	8536.69.4040

Engineering Selection Recommendations

The N3440-5002RB is the direct substitute for the obsolete 3M 3440-5603. Selection of the substitute part is supported by the following factors:

Product Status: The substitute part is classified as active, ensuring ongoing availability and supply chain continuity, whereas the main part is obsolete.

Regulatory Compliance: The N3440-5002RB is RoHS Compliant and REACH Unaffected, providing enhanced environmental and regulatory alignment compared to the non-compliant main part.

Functional Equivalence: All critical electrical and mechanical parameters are identical between the two parts, including pitch, position count, row configuration, mounting method, termination type, and operating temperature range.

Fastening Mechanism Difference: The main part uses Latch Lock/Eject Hooks (Long), while the substitute uses Push-Pull fastening. Both mechanisms provide secure mating and are suitable for board-to-cable/wire applications.

Contact Post Specifications: Minor differences exist in contact post length (0.155" vs. 0.112") and post finish (Tin-Lead vs. Tin). These variations do not affect functional compatibility in standard applications.

Frequently Asked Questions (FAQ)

Q: Can the N3440-5002RB be used as a direct replacement for the 3440-5603 in existing designs?

A: Yes. The substitute part meets all critical electrical and mechanical parameters required for functional equivalence. The connector maintains identical pitch, position count, row spacing, mounting configuration, and operating temperature range. Verification of fastening mechanism compatibility with mating connectors is recommended during design review.

Q: What is the difference between the Latch Lock/Eject Hooks fastening on the main part and the Push-Pull fastening on the substitute?

A: Both fastening mechanisms provide secure mating and disconnection. Latch Lock/Eject Hooks use mechanical latches for retention, while Push-Pull uses a sliding mechanism. Selection depends on the mating connector type and application requirements. Compatibility with existing mating connectors must be confirmed.

Q: Are there any compliance differences between the two parts?

A: Yes. The N3440-5002RB is RoHS Compliant and REACH Unaffected, while the 3440-5603 is RoHS non-compliant. For applications subject to RoHS or REACH regulations, the substitute part is required.

Q: What is the significance of the contact post length difference?

A: The main part has a contact post length of 0.155" (3.94mm), while the substitute has 0.112" (2.84mm). This difference affects solder joint geometry and PCB pad design. PCB layout compatibility should be verified during design transition.

Q: Are both parts available in the same packaging?

A: The main part packaging is not specified. The substitute part is available in Bulk packaging. Packaging requirements should be confirmed with procurement specifications.

Q: What is the inventory status for each part?

A: The main part (3440-5603) has 978 pieces in stock as new original inventory. The substitute part (N3440-5002RB) has 1212 pieces in stock as new original inventory. Inventory levels are subject to change and should be confirmed at time of purchase.

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