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

Part Overview

The HTST-125-01-T-DV is a surface mount rectangular connector header manufactured by Samtec Inc. in the Flex Stack series. This 50-position, 2-row connector with 0.100" (2.54mm) pitch is designed for board-to-cable/wire applications with push-pull fastening and shrouded 4-wall construction. The part is currently active in production and stocked at 812 units. Equivalent parts are identified when design requirements allow substitution based on matching electrical and mechanical parameters within acceptable tolerances.

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
Operating Temperature Range	-55°C ~ 105°C
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

The N2550-6V0C-RB-WG (3M) qualifies as an equivalent substitute based on the following matching parameters:

50-position, 2-row configuration
0.100" (2.54mm) mating pitch and row spacing
Surface mount termination with solder connection
Shrouded 4-wall construction with push-pull fastening
Identical operating temperature range (-55°C ~ 105°C)
UL94 V-0 flammability rating
RoHS compliance (both ROHS3 and RoHS Compliant meet regulatory requirements)
Board-to-board or cable interface capability
Active product status with current manufacturing availability

Parameter Comparison

Parameter	HTST-125-01-T-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
Termination	Solder	Solder
Contact Length - Mating	0.250" (6.35mm)	0.243" (6.17mm)
Insulation Height	0.350" (8.89mm)	0.390" (9.91mm)
Contact Shape	Square	Square
Contact Material	Phosphor Bronze	Copper Alloy
Insulation Material	Liquid Crystal Polymer (LCP)	Polycyclohexylenedimethylene Terephthalate (PCT), Glass Filled
Contact Finish - Mating	Tin	Gold
Operating Temperature	-55°C ~ 105°C	-55°C ~ 105°C
Material Flammability Rating	UL94 V-0	UL94 V-0
RoHS Status	ROHS3 Compliant	RoHS Compliant
Product Status	Active	Active
Packaging	Tube	Cut Tape (CT)
Current Inventory	812 Pcs	1446 Pcs

Engineering Selection Recommendations

Both the HTST-125-01-T-DV and N2550-6V0C-RB-WG are active products with current manufacturing support and full RoHS compliance. Selection between these parts should be based on:

Packaging format requirements: HTST-125-01-T-DV is supplied in tube packaging, while N2550-6V0C-RB-WG is supplied in cut tape format
Contact finish specification: HTST-125-01-T-DV uses tin plating; N2550-6V0C-RB-WG uses gold plating (30.0µin thickness)
Insulation material compatibility: HTST-125-01-T-DV uses LCP; N2550-6V0C-RB-WG uses glass-filled PCT
Mechanical envelope: Contact mating length differs by 0.007" (0.18mm); insulation height differs by 0.040" (1.02mm)
Current rating: HTST-125-01-T-DV is rated at 3.4A per contact; N2550-6V0C-RB-WG is rated at 1.75A per contact
Inventory availability: N2550-6V0C-RB-WG has higher current stock (1446 units vs. 812 units)

Frequently Asked Questions (FAQ)

Q: Can N2550-6V0C-RB-WG be used as a direct replacement for HTST-125-01-T-DV?

A: Both connectors share identical pitch (0.100"), row configuration (2 rows, 50 positions), mounting type (surface mount), shrouding (4-wall), and fastening mechanism (push-pull). However, differences in contact mating length (0.007"), insulation height (0.040"), and current rating (3.4A vs. 1.75A) must be evaluated against specific application requirements.

Q: What are the key differences in contact finish between these parts?

A: HTST-125-01-T-DV features tin-plated contacts, while N2550-6V0C-RB-WG features gold-plated contacts (30.0µin thickness). Gold plating provides enhanced corrosion resistance and lower contact resistance, while tin plating is suitable for standard industrial applications.

Q: How do the insulation materials differ?

A: HTST-125-01-T-DV uses Liquid Crystal Polymer (LCP), while N2550-6V0C-RB-WG uses glass-filled Polycyclohexylenedimethylene Terephthalate (PCT). Both materials meet UL94 V-0 flammability requirements and operate across the same temperature range (-55°C ~ 105°C).

Q: What packaging considerations apply to these parts?

A: HTST-125-01-T-DV is supplied in tube packaging, suitable for manual handling and lower-volume assembly. N2550-6V0C-RB-WG is supplied in cut tape format, optimized for automated pick-and-place assembly processes.

Q: Are both parts RoHS compliant?

A: Yes. HTST-125-01-T-DV is ROHS3 compliant, and N2550-6V0C-RB-WG is RoHS compliant. Both meet current regulatory requirements for restricted substance elimination.

Q: What is the current rating difference, and when does it matter?

A: HTST-125-01-T-DV supports 3.4A per contact, while N2550-6V0C-RB-WG supports 1.75A per contact. Applications requiring current levels above 1.75A per contact must use HTST-125-01-T-DV or verify that the lower rating is acceptable for the intended circuit design.

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