3M 3408-6503UG Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The 3M 3408-6503UG is a shrouded rectangular connector header designed for through-hole mounting with 16 positions arranged in 2 rows at 0.100" (2.54mm) pitch. This connector features male pins with gold-plated mating contacts and tin-lead plated posts, suitable for board-to-board or cable applications. The part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs or replacement applications.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	16
Number of Rows	2
Pitch - Mating	0.100" (2.54mm)
Row Spacing - Mating	0.100" (2.54mm)
Shrouding	Shrouded - 4 Wall
Mounting Type	Through Hole
Termination	Solder
Contact Finish - Mating	Gold
Contact Finish - Post	Tin-Lead or Tin
Operating Temperature Range	-55°C ~ 105°C (main part); -55°C ~ 125°C (HARTING alternatives)
Material Flammability Rating	UL94 V-0
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following core parameters:

Critical Matching Parameters:

Connector Type: Header
Contact Type: Male Pin
Number of Positions: 16
Number of Rows: 2
Pitch - Mating: 0.100" (2.54mm)
Row Spacing - Mating: 0.100" (2.54mm)
Shrouding: Shrouded - 4 Wall
Mounting Type: Through Hole
Termination: Solder
Contact Finish - Mating: Gold
Material Flammability Rating: UL94 V-0
Moisture Sensitivity Level: 1

Allowable Variations:

Contact Length - Mating: 0.228" to 0.240" (5.80mm to 6.10mm)
Contact Length - Post: 0.112" to 0.177" (2.84mm to 4.50mm)
Overall Contact Length: 0.650" to 0.713" (16.51mm to 18.10mm)
Insulation Height: 0.680" to 0.681" (17.27mm to 17.30mm)
Contact Material: Copper Alloy or Brass
Insulation Material: PBT or PCT, Glass Filled
Fastening Type: Latch Lock/Eject Hooks (Short or Long) or Push-Pull
Contact Finish - Post: Tin or Tin-Lead
Operating Temperature: -55°C minimum to 105°C or higher maximum
RoHS Status: Non-compliant or compliant variants acceptable

All substitute parts listed maintain the core electrical and mechanical interface specifications required for direct functional replacement.

Parameter Comparison

Parameter	3408-6503UG (Main)	D3408-6002-AR	N3408-6002RB	09185165902	09185166902	09185166904	09185166914	09185166914001	09185167904	09185167914	09195166914
Manufacturer	3M	3M	3M	HARTING	HARTING	HARTING	HARTING	HARTING	HARTING	HARTING	HARTING
Connector Type	Header	Header	Header	Header	Header	Header	Header	Header	Header	Header	Header
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Number of Positions	16	16	16	16	16	16	16	16	16	16	16
Number of Rows	2	2	2	2	2	2	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)	0.100" (2.54mm)	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)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall	Shrouded - 4 Wall
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder	Solder
Fastening Type	Latch Lock/Eject Hooks, Short	Push-Pull	Push-Pull	Latch Lock/Eject Hooks, Long	Latch Lock/Eject Hooks, Long	Latch Lock/Eject Hooks, Long	Latch Lock/Eject Hooks, Short	Latch Lock/Eject Hooks, Short	Latch Lock/Eject Hooks, Long	Latch Lock/Eject Hooks, Short	Latch Lock/Eject Hooks, Short
Contact Length - Mating	0.240" (6.10mm)	0.240" (6.10mm)	0.240" (6.10mm)	0.240" (6.10mm)	0.240" (6.10mm)	0.228" (5.80mm)	0.228" (5.80mm)	0.228" (5.80mm)	0.228" (5.80mm)	0.228" (5.80mm)	0.228" (5.80mm)
Contact Length - Post	0.155" (3.94mm)	0.112" (2.84mm)	0.112" (2.84mm)	0.177" (4.50mm)	0.177" (4.50mm)	0.114" (2.90mm)	0.114" (2.90mm)	0.114" (2.90mm)	0.114" (2.90mm)	0.114" (2.90mm)	0.114" (2.90mm)
Overall Contact Length	0.695" (17.65mm)	0.652" (16.56mm)	0.652" (16.56mm)	0.713" (18.10mm)	0.713" (18.10mm)	0.650" (16.51mm)	0.650" (16.51mm)	0.654" (16.60mm)	0.650" (16.51mm)	0.650" (16.51mm)	0.650" (16.51mm)
Insulation Height	0.680" (17.27mm)	0.680" (17.27mm)	0.680" (17.27mm)	0.681" (17.30mm)	0.681" (17.30mm)	0.681" (17.30mm)	0.681" (17.30mm)	0.681" (17.30mm)	0.681" (17.30mm)	0.681" (17.30mm)	0.681" (17.30mm)
Contact Shape	Square	Square	Square	Square	Square	Square	Square	Square	Square	Square	Square
Contact Finish - Mating	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Gold	Not specified
Contact Finish - Post	Tin-Lead	Tin	Tin	Tin	Tin	Tin	Tin	Not specified	Tin	Tin	Tin
Contact Material	Copper Alloy	Brass	Copper Alloy	Copper Alloy	Copper Alloy	Copper Alloy	Copper Alloy	Copper Alloy	Copper Alloy	Copper Alloy	Copper Alloy
Insulation Material	PBT, Polyester, Glass Filled	PCT, Polyester, Glass Filled	PCT, Polyester, Glass Filled	PBT, Glass Filled	PBT, Glass Filled	PBT, Glass Filled	PBT, Glass Filled	PBT, Glass Filled	PBT, Glass Filled	PBT, Glass Filled	PCT, Glass Filled
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 105°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Insulation Color	Black	Black	Black	Gray	Gray	Gray	Gray	Black	Gray	Gray	Beige
Current Rating (Amps)	1A	1.75A	1.75A	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified	Not specified
RoHS Status	RoHS non-compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation - 3M D3408-6002-AR: This part maintains 3M manufacturer continuity and is actively produced. It provides ROHS3 compliance and increased current rating (1.75A versus 1A). The push-pull fastening mechanism offers enhanced mating security compared to the original latch lock design. Suitable for new designs requiring RoHS compliance and higher current capacity.

Secondary Recommendation - 3M N3408-6002RB: Maintains 3M sourcing with RoHS compliance and active production status. Push-pull fastening provides improved connector reliability. Bulk packaging option available. Equivalent electrical performance to D3408-6002-AR with identical pitch and position configuration.

HARTING Alternatives - 09185166914, 09185167904, 09185166914001, 09185167914: HARTING SEK series connectors provide ROHS3 compliance and extended operating temperature range (-55°C to 125°C). These parts feature latch lock/eject hook fastening mechanisms matching the original design philosophy. Suitable for applications requiring higher temperature operation or HARTING supply chain integration. All maintain 16-position, 2-row, 2.54mm pitch configuration with gold-plated mating contacts.

HARTING Alternatives - 09185165902, 09185166902: Extended contact post length (0.177" / 4.50mm) accommodates deeper PCB mounting requirements. Latch lock/eject hook fastening with long engagement. ROHS3 compliant with -55°C to 125°C operating range. Suitable for applications requiring maximum contact engagement depth.

HARTING Alternative - 09195166914: PCT insulation material with beige color coding. Latch lock/eject hook fastening (short). ROHS3 compliant with extended temperature range. Suitable for applications requiring alternative insulation material specifications.

All substitute parts maintain the critical electrical interface: 16 positions, 2 rows, 0.100" (2.54mm) pitch, shrouded 4-wall configuration, through-hole solder termination, and gold-plated mating contacts. Selection should be based on fastening mechanism preference, temperature requirements, RoHS compliance mandates, and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 3408-6503UG with any of the listed substitutes? A: Yes, all listed parts maintain the core electrical and mechanical interface specifications. The 16-position, 2-row, 0.100" pitch configuration and gold-plated mating contacts ensure functional compatibility. Fastening mechanism differences (latch lock versus push-pull) do not affect electrical performance but may impact mating force and connector retention characteristics.

Q: What is the difference between latch lock and push-pull fastening types? A: Latch lock/eject hooks provide positive mechanical engagement with spring-loaded release mechanisms. Push-pull fastening uses a sliding collar for mating and unmating. Both provide secure connections; selection depends on application requirements for mating force, frequency of disconnect cycles, and operator preference.

Q: Why do HARTING parts have higher operating temperature ratings? A: HARTING SEK series connectors are rated to -55°C to 125°C, compared to the original 3M part's -55°C to 105°C. This reflects different material and design specifications. Applications operating above 105°C should specify HARTING alternatives.

Q: Are there RoHS compliance differences between substitutes? A: The original 3408-6503UG is RoHS non-compliant. All substitute parts listed are ROHS3 compliant or RoHS compliant, meeting current environmental regulations. This is a significant advantage for new designs and applications subject to RoHS requirements.

Q: What packaging options are available? A: D3408-6002-AR is supplied in trays. N3408-6002RB is supplied in bulk. HARTING parts are available in both bulk and tray packaging depending on specific part number. Verify packaging requirements with supplier documentation.

Q: Do contact length variations affect PCB mounting? A: Contact length variations (0.112" to 0.177" post length) accommodate different PCB thicknesses and mounting depths. Verify PCB hole depth compatibility with selected substitute. Longer post lengths (HARTING 09185165902, 09185166902) suit thicker PCB assemblies.

Q: Can I mix fastening types in the same application? A: No. Fastening type selection should be consistent across all connectors in an assembly to maintain uniform mating force and connector retention characteristics.

Q: What is the current rating difference between the main part and substitutes? A: The original 3408-6503UG is rated 1A. 3M substitutes D3408-6002-AR and N3408-6002RB are rated 1.75A. HARTING parts do not specify current ratings in provided documentation. Verify current requirements against application specifications.

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