HTST-125-01-S-DV Equivalent & Substitute Parts

Part Overview

The HTST-125-01-S-DV is a rectangular connector header manufactured by Samtec Inc., designed for surface mount applications requiring 50-position, 2.54mm pitch connectivity. This shrouded, push-pull fastened header operates across -55°C to 125°C and supports 3.4A per contact with gold-plated mating surfaces. The component is actively produced and RoHS3 compliant, making it suitable for industrial and commercial applications requiring reliable board-to-cable interconnection.

Substitute parts become necessary when addressing supply chain constraints, inventory availability, or specific application requirements that align with equivalent electrical and mechanical specifications.

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	Surface Mount
Shrouding	Shrouded - 4 Wall
Fastening Type	Push-Pull
Contact Finish - Mating	Gold
Operating Temperature Range	-55°C ~ 125°C
Current Rating	3.4A per Contact
Material Flammability Rating	UL94 V-0
RoHS Status	RoHS3 Compliant

Substitute Part Grouping Explanation

The N2550-6V0C-RB-WG (3M) qualifies as a substitute based on the following alignment of critical parameters:

Matching Electrical Characteristics:

Connector type: Header with male pin contacts
Position count: 50 positions across 2 rows
Pitch specification: 0.100" (2.54mm) mating pitch with 0.100" row spacing
Mounting method: Surface mount with solder termination
Fastening mechanism: Push-pull configuration
Contact finish: Gold-plated mating surfaces
Shrouding: 4-wall shrouded design
Flammability rating: UL94 V-0
Regulatory compliance: RoHS compliant and REACH unaffected

Operational Differences: The substitute operates within -55°C to 105°C (versus -55°C to 125°C for the main part) and carries a reduced current rating of 1.75A per contact (versus 3.4A). These differences define the scope of substitution applicability and must be evaluated against specific application requirements.

Parameter Comparison

Parameter	HTST-125-01-S-DV (Samtec)	N2550-6V0C-RB-WG (3M)
Manufacturer	Samtec Inc.	3M
Series	Flex Stack, HTST	2500
Connector Type	Header	Header
Contact Type	Male Pin	Male Pin
Number of Positions	50	50
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	Surface Mount	Surface Mount
Shrouding	Shrouded - 4 Wall	Shrouded - 4 Wall
Fastening Type	Push-Pull	Push-Pull
Contact Finish - Mating	Gold	Gold
Contact Finish Thickness - Mating	30.0µin (0.76µm)	30.0µin (0.76µm)
Contact Material	Phosphor Bronze	Copper Alloy
Insulation Material	Liquid Crystal Polymer (LCP)	Polycyclohexylenedimethylene Terephthalate (PCT), Glass Filled
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 105°C
Current Rating (Amps)	3.4A per Contact	1.75A per Contact
Material Flammability Rating	UL94 V-0	UL94 V-0
RoHS Status	RoHS3 Compliant	RoHS Compliant
Packaging	Tube	Cut Tape (CT)
Product Status	Active	Active

Engineering Selection Recommendations

Primary Selection (HTST-125-01-S-DV): Select the Samtec HTST-125-01-S-DV when applications require the full operating temperature range of -55°C to 125°C or demand the higher current capacity of 3.4A per contact. This part maintains active production status and RoHS3 compliance, supporting long-term supply chain stability.

Substitute Selection (N2550-6V0C-RB-WG): The 3M N2550-6V0C-RB-WG serves as a functional substitute for applications operating within -55°C to 105°C and where per-contact current requirements do not exceed 1.75A. Both parts maintain active product status and equivalent flammability ratings. The substitute offers alternative packaging in cut tape format and includes pick-and-place features for automated assembly environments.

Compliance Alignment: Both parts achieve UL94 V-0 flammability ratings and maintain RoHS compliance. The main part carries RoHS3 certification while the substitute carries standard RoHS certification. Both remain REACH unaffected with matching ECCN and HTSUS classifications.

Frequently Asked Questions (FAQ)

Q: Can the N2550-6V0C-RB-WG replace the HTST-125-01-S-DV in all applications?

A: No. The substitute is limited to applications operating within -55°C to 105°C and requiring maximum 1.75A per contact. Applications demanding the full -55°C to 125°C range or 3.4A per contact require the primary part.

Q: What are the key mechanical compatibility factors?

A: Both parts share identical mating pitch (0.100"), row spacing (0.100"), position count (50), row configuration (2), and shrouding design (4-wall). Mechanical interchangeability is confirmed for board-level mounting and connector mating interfaces.

Q: How do the insulation materials differ?

A: The HTST-125-01-S-DV uses Liquid Crystal Polymer (LCP) insulation, while the N2550-6V0C-RB-WG uses glass-filled Polycyclohexylenedimethylene Terephthalate (PCT). Both materials achieve UL94 V-0 ratings. Material selection should align with specific thermal and mechanical requirements of the application.

Q: What packaging differences exist between these parts?

A: The HTST-125-01-S-DV ships in tube packaging, while the N2550-6V0C-RB-WG is supplied in cut tape format. The substitute includes pick-and-place features suitable for automated assembly processes.

Q: Are there contact material differences that affect performance?

A: The main part uses phosphor bronze contacts while the substitute uses copper alloy contacts. Both feature identical gold plating thickness (30.0µin) on mating surfaces. Contact material selection should be evaluated against specific application corrosion and wear requirements.

Q: What is the current inventory status for each part?

A: The HTST-125-01-S-DV maintains 921 pieces in stock. The N2550-6V0C-RB-WG maintains 1446 pieces in stock. Inventory levels support immediate procurement for both options.

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