3M 2550-5002UG Rectangular Connector Header - Equivalent & Substitute Parts

Part Overview

The 3M 2550-5002UG is a through-hole, right-angle rectangular connector header with 50 positions at 2.54mm pitch, designed for board-to-board or cable interconnection applications. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance requirements. The connector features shrouded 4-wall construction with gold-plated mating contacts and tin-lead post finishes, suitable for applications requiring reliable solder termination and push-pull fastening.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	50
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
Fastening Type	Push-Pull
Contact Finish - Mating	Gold
Contact Finish - Post	Tin-Lead
Material Flammability Rating	UL94 V-0
Operating Temperature	-55°C ~ 105°C
Current Rating	1.75A
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

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

Critical Matching Parameters:

Number of Positions: 50
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, Right Angle
Shrouding: Shrouded - 4 Wall
Termination: Solder
Material Flammability Rating: UL94 V-0

Allowable Variations:

Contact Finish - Mating: Gold thickness may vary (10.0µin to 30.0µin)
Contact Finish - Post: Tin-Lead or Tin
Contact Material: Copper Alloy or Brass
Insulation Material: PCT or PBT, Glass Filled
Fastening Type: Push-Pull or Latch Holder
Operating Temperature: Range must encompass or equal -55°C ~ 105°C minimum
Product Status: Active or Obsolete
RoHS Compliance: Compliant or non-compliant (application-dependent)
Packaging: Bulk, Tray, or Tube

Substitutes are grouped by manufacturer and product status to facilitate selection based on availability, compliance requirements, and application constraints.

Parameter Comparison

Part Number	Manufacturer	Positions	Pitch (mm)	Mounting	Fastening	Contact Finish - Mating	Contact Finish - Post	Operating Temp (°C)	Product Status	RoHS Status	Inventory
2550-5002UG	3M	50	2.54	Through Hole, Right Angle	Push-Pull	Gold (15.0µin)	Tin-Lead	-55 ~ 105	Obsolete	Non-compliant	1026
2550-5002UB	3M	50	2.54	Through Hole, Right Angle	Push-Pull	Gold (30.0µin)	Tin-Lead	-55 ~ 105	Obsolete	Non-compliant	1104
D2550-5002-AR	3M	50	2.54	Through Hole, Right Angle	Push-Pull	Gold (10.0µin)	Tin	-55 ~ 105	Active	ROHS3 Compliant	1557
N2550-5002-RB	3M	50	2.54	Through Hole, Right Angle	Push-Pull	Gold (30.0µin)	Tin	-55 ~ 105	Active	RoHS Compliant	6753
0702475051	Molex	50	2.54	Through Hole, Right Angle	Push-Pull	Gold (15.0µin)	Tin	Not specified	Active	ROHS3 Compliant	655
0702475052	Molex	50	2.54	Through Hole, Right Angle	Push-Pull	Gold (30.0µin)	Tin	Not specified	Active	ROHS3 Compliant	744
09185506323	HARTING	50	2.54	Through Hole, Right Angle	Latch Holder	Gold	Not specified	-55 ~ 125	Active	ROHS3 Compliant	690
09195506323	HARTING	50	2.54	Through Hole, Right Angle	Latch Holder	Not specified	Not specified	-55 ~ 125	Active	ROHS3 Compliant	1033
1-103310-0	TE Connectivity AMP Connectors	50	2.54	Through Hole, Right Angle	Push-Pull	Gold or Gold-Palladium (15.0µin)	Tin-Lead	-65 ~ 105	Active	Non-compliant	1063
1-103311-0	TE Connectivity AMP Connectors	50	2.54	Through Hole, Right Angle	Push-Pull	Gold or Gold-Palladium (30.0µin)	Tin-Lead	-65 ~ 105	Active	Not applicable	847
1-5103311-0	TE Connectivity AMP Connectors	50	2.54	Through Hole, Right Angle	Push-Pull	Gold or Gold-Palladium (30.0µin)	Tin	-65 ~ 105	Active	ROHS3 Compliant	1271

Engineering Selection Recommendations

3M Series (Same Manufacturer): The 3M 2550-5002UB and 2550-5002UG are functionally equivalent obsolete parts with identical electrical and mechanical specifications, differing only in contact finish thickness. The active 3M alternatives D2550-5002-AR and N2550-5002-RB provide direct functional replacement with improved compliance status. D2550-5002-AR achieves ROHS3 compliance and is recommended for new designs requiring regulatory compliance. N2550-5002-RB offers the highest inventory availability (6753 units) and RoHS compliance with identical mechanical and electrical parameters.

Molex C-Grid 70247 Series (0702475051, 0702475052): These Molex alternatives provide active product status and ROHS3 compliance. Minor dimensional variations exist in contact length and insulation height. Both parts maintain the required 50-position, 2.54mm pitch configuration with push-pull fastening. Molex parts are suitable for applications where cross-manufacturer qualification is acceptable.

HARTING SEK Series (09185506323, 09195506323): HARTING alternatives feature latch holder fastening instead of push-pull, representing a functional variation. Operating temperature extends to -55°C ~ 125°C, exceeding the original specification. These parts are ROHS3 compliant and active. Fastening type difference requires mechanical compatibility verification before substitution.

TE Connectivity AMP-Latch Series (1-103310-0, 1-103311-0, 1-5103311-0): TE Connectivity parts provide active status with extended operating temperature range (-65°C ~ 105°C). The 1-5103311-0 offers ROHS3 compliance with tin post finish. Non-compliant variants (1-103310-0, 1-103311-0) maintain compatibility with legacy applications. All TE parts feature push-pull fastening consistent with the original specification.

Frequently Asked Questions (FAQ)

Q: Can I substitute 2550-5002UG with any of these parts directly?

A: Direct substitution is possible only with parts matching all critical parameters: 50 positions, 2.54mm pitch, 2-row configuration, through-hole right-angle mounting, shrouded 4-wall construction, solder termination, and UL94 V-0 flammability rating. The 3M 2550-5002UB, D2550-5002-AR, and N2550-5002-RB meet these requirements. HARTING parts with latch holder fastening require mechanical compatibility verification. Molex parts require cross-manufacturer qualification.

Q: What is the difference between push-pull and latch holder fastening?

A: Push-pull fastening uses a simple push-to-connect, pull-to-disconnect mechanism. Latch holder fastening incorporates a latching mechanism for more secure mating. These are mechanically distinct and require different mating connectors. Substitution between fastening types is not recommended without mechanical compatibility verification.

Q: Are RoHS-compliant parts compatible with non-compliant designs?

A: RoHS compliance indicates the absence of restricted substances (lead, cadmium, mercury, etc.). RoHS-compliant parts can be used in applications previously designed for non-compliant parts, provided all other electrical and mechanical parameters match. However, non-compliant parts cannot replace compliant parts in regulated applications.

Q: What packaging options are available?

A: Substitute parts are available in bulk, tray, and tube packaging. Bulk packaging is standard for high-volume applications. Tray packaging (D2550-5002-AR) provides organized component handling. Tube packaging (1-103310-0, 1-5103311-0) is suitable for automated assembly processes. Packaging selection does not affect electrical or mechanical compatibility.

Q: How do contact finish variations affect performance?

A: Contact finish thickness variations (10.0µin to 30.0µin for gold mating surfaces) do not affect electrical performance within the specified current rating of 1.75A. Thicker finishes provide enhanced durability in high-cycle mating applications. Post finish variations (tin-lead versus tin) are compatible with standard solder reflow processes. Selection should be based on application cycle life requirements and environmental exposure.

Q: Which substitute offers the best availability?

A: The 3M N2550-5002-RB provides the highest inventory availability at 6753 units, combined with active product status and RoHS compliance. This part is recommended for applications requiring immediate availability and regulatory compliance.

Q: Can I use parts with extended operating temperature ranges?

A: Yes. Parts with extended operating temperature ranges (such as HARTING -55°C ~ 125°C or TE Connectivity -65°C ~ 105°C) are compatible with applications designed for the original -55°C ~ 105°C specification. Extended range provides additional design margin for temperature-sensitive applications.

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