HTMS-125-02-S-D Equivalent & Substitute Parts

Part Overview

The HTMS-125-02-S-D is a rectangular connector header manufactured by Samtec Inc., designed for through-hole board-to-board applications. This 50-position connector operates across a wide temperature range of -55°C to 125°C and features gold-plated mating contacts with tin-plated posts. The part is currently active in production and maintains full RoHS3 compliance with MSL Level 1 rating, making it suitable for applications requiring reliable interconnection without moisture sensitivity constraints.

Substitute parts are identified when equivalent electrical and mechanical parameters align with the original specification, ensuring functional interchangeability in the target application.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Number of Positions	50
Number of Rows	2
Pitch - Mating	0.050" (1.27mm)
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Termination	Solder
Style	Board to Board
Shrouding	Unshrouded
Operating Temperature Range	-55°C ~ 125°C
Contact Finish - Mating	Gold
Contact Material	Phosphor Bronze
Insulation Material	Liquid Crystal Polymer (LCP)
Current Rating	5A per Contact
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the HTMS-125-02-S-D is determined by strict alignment of the following critical parameters:

Connector type (Header) and contact type (Male Pin)
Position count (50) and row configuration (2 rows)
Mating pitch (0.050" / 1.27mm) and row spacing (0.100" / 2.54mm)
Mounting method (Through Hole) and termination type (Solder)
Board-to-board style with unshrouded design
Contact finish specification (Gold mating surface)
Compliance certifications (RoHS3, UL94 V-0)

The substitute part 6-103916-3 (TE Connectivity AMP Connectors) meets these core electrical and mechanical requirements, enabling functional equivalence in applications where the HTMS-125-02-S-D is specified.

Parameter Comparison

Parameter	HTMS-125-02-S-D (Samtec)	6-103916-3 (TE Connectivity)	Compatibility
Connector Type	Header	Header	Match
Contact Type	Male Pin	Male Pin	Match
Number of Positions	50	50	Match
Number of Rows	2	2	Match
Pitch - Mating	0.050" (1.27mm)	0.050" (1.27mm)	Match
Row Spacing - Mating	0.100" (2.54mm)	0.100" (2.54mm)	Match
Mounting Type	Through Hole	Through Hole	Match
Termination	Solder	Solder	Match
Style	Board to Board	Board to Board or Cable	Compatible
Shrouding	Unshrouded	Unshrouded	Match
Contact Finish - Mating	Gold	Gold	Match
Contact Finish Thickness - Mating	30.0µin (0.76µm)	30.0µin (0.76µm)	Match
Contact Material	Phosphor Bronze	Copper Alloy	Compatible
Insulation Material	Liquid Crystal Polymer (LCP)	Thermoplastic	Compatible
Insulation Color	Black	Black	Match
Operating Temperature Range	-55°C ~ 125°C	-65°C ~ 105°C	Partial Overlap
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match
MSL Rating	1 (Unlimited)	1 (Unlimited)	Match
Material Flammability Rating	UL94 V-0	UL94 V-0	Match

Engineering Selection Recommendations

Both the HTMS-125-02-S-D and 6-103916-3 are active production parts with full RoHS3 compliance and UL94 V-0 flammability certification. Selection between these parts should be based on application-specific operating temperature requirements.

The HTMS-125-02-S-D supports an extended upper temperature limit of 125°C, making it suitable for high-temperature applications. The 6-103916-3 operates to 105°C maximum, with a lower temperature floor of -65°C compared to -55°C for the Samtec part.

Both connectors feature identical mating pitch, row spacing, position count, and contact finish specifications. The difference in insulation material (LCP versus thermoplastic) and contact material (phosphor bronze versus copper alloy) does not affect functional interchangeability for standard board-to-board interconnection applications.

Frequently Asked Questions (FAQ)

Q: Can the 6-103916-3 be used as a direct replacement for the HTMS-125-02-S-D?

A: Yes, for applications operating within the overlapping temperature range of -55°C to 105°C. Both connectors share identical mating pitch (0.050"), row spacing (0.100"), position count (50), and contact finish specifications. Physical footprint and PCB mounting hole patterns are equivalent.

Q: What is the key difference in operating temperature between these parts?

A: The HTMS-125-02-S-D operates from -55°C to 125°C, while the 6-103916-3 operates from -65°C to 105°C. If your application requires sustained operation above 105°C, the HTMS-125-02-S-D is the appropriate choice.

Q: Are the contact materials interchangeable?

A: Yes. The HTMS-125-02-S-D uses phosphor bronze contacts, while the 6-103916-3 uses copper alloy contacts. Both materials provide equivalent electrical conductivity and mating performance for standard signal and power distribution applications.

Q: Do both parts have the same insulation material?

A: No. The HTMS-125-02-S-D uses Liquid Crystal Polymer (LCP), while the 6-103916-3 uses thermoplastic insulation. Both materials meet UL94 V-0 flammability requirements and provide equivalent mechanical and electrical insulation properties for board-to-board applications.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the HTMS-125-02-S-D and 6-103916-3 are fully RoHS3 compliant with MSL Level 1 rating, indicating no moisture sensitivity constraints during storage and handling.

Q: What is the mating pitch for these connectors?

A: Both connectors feature a 0.050" (1.27mm) mating pitch with 0.100" (2.54mm) row spacing, supporting 50-position, 2-row configurations.

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