FTS-125-01-FM-D Equivalent & Substitute Parts

Part Overview

The FTS-125-01-FM-D is a rectangular connector header manufactured by Samtec Inc., designed for through-hole board-to-board or cable applications. This connector features 50 positions arranged in 2 rows with 0.050" (1.27mm) pitch spacing, gold-plated mating contacts, and tin-plated posts. The part is actively produced and ROHS3 compliant, suitable for applications requiring reliable interconnection in temperature ranges from -55°C to 125°C.

Substitute parts are identified to address inventory availability, specific design requirements such as shrouding or pick-and-place compatibility, and manufacturing lead time considerations while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	FTS-125-01-FM-D
Manufacturer	Samtec Inc.
Category	Rectangular Connectors
Connector Type	Header, Cuttable
Contact Type	Male Pin
Number of Positions	50
Number of Rows	2
Pitch - Mating	0.050" (1.27mm)
Row Spacing - Mating	0.050" (1.27mm)
Mounting Type	Through Hole
Termination	Solder
Contact Finish - Mating	Gold
Contact Finish - Post	Tin
Contact Material	Phosphor Bronze
Insulation Material	Liquid Crystal Polymer (LCP)
Operating Temperature	-55°C ~ 125°C
Current Rating	3.4A per Contact
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence in the following critical parameters:

Connector Type: Header, Cuttable
Contact Type: Male Pin
Number of Positions: 50
Number of Rows: 2
Pitch - Mating: 0.050" (1.27mm)
Row Spacing - Mating: 0.050" (1.27mm)
Mounting Type: Through Hole
Termination: Solder
Contact Material: Phosphor Bronze
Insulation Material: Liquid Crystal Polymer (LCP)
Operating Temperature Range: -55°C ~ 125°C
Current Rating: 3.4A per Contact
RoHS Status: ROHS3 Compliant

Substitute parts may differ in shrouding configuration, overall contact length, insulation height, and manufacturing features (such as pick-and-place compatibility or keying shrouds) without affecting electrical or mechanical compatibility in standard applications.

Parameter Comparison

Parameter	FTS-125-01-FM-D	FTS-125-01-F-D	FTS-125-01-F-D-P	FTSH-125-01-F-D	FTSH-125-01-F-D-K
Manufacturer	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.	Samtec Inc.
Series	FTS	FTS	FTS	FTSH	FTSH
Connector Type	Header, Cuttable	Header, Cuttable	Header, Cuttable	Header, Cuttable	Header, Cuttable
Contact Type	Male Pin	Male Pin	Male Pin	Male Pin	Male Pin
Number of Positions	50	50	50	50	50
Number of Rows	2	2	2	2	2
Pitch - Mating	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)
Row Spacing - Mating	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination	Solder	Solder	Solder	Solder	Solder
Contact Finish - Mating	Gold	Gold	Gold	Gold	Gold
Contact Finish - Post	Tin	Tin	Tin	Tin	Tin
Contact Material	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze	Phosphor Bronze
Insulation Material	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)	Liquid Crystal Polymer (LCP)
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Current Rating	3.4A per Contact	3.4A per Contact	3.4A per Contact	3.4A per Contact	3.4A per Contact
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active
Shrouding	Unshrouded	Unshrouded	Unshrouded	Unshrouded	Shrouded
Overall Contact Length	0.244" (6.20mm)	0.244" (6.20mm)	0.244" (6.20mm)	0.309" (7.86mm)	0.309" (7.86mm)
Insulation Height	0.034" (0.86mm)	0.034" (0.86mm)	0.034" (0.86mm)	0.099" (2.51mm)	0.099" (2.51mm)
Features	—	—	Pick and Place	—	Keying Shroud
Inventory Status	911 Pcs New Original In Stock	1129 Pcs New Original In Stock	955 Pcs New Original In Stock	1031 Pcs New Original In Stock	744 Pcs New Original In Stock

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the FTS-125-01-FM-D based on identical core specifications: 50-position, 2-row configuration with 0.050" (1.27mm) pitch, phosphor bronze contacts with gold mating finish, and LCP insulation rated for -55°C to 125°C operation at 3.4A per contact.

FTS-125-01-F-D is electrically and mechanically equivalent to the main part, differing only in series designation. Both are unshrouded with identical overall contact length and insulation height.

FTS-125-01-F-D-P provides identical electrical and mechanical specifications with the addition of pick-and-place feature compatibility for automated assembly processes.

FTSH-125-01-F-D maintains all electrical specifications while featuring increased overall contact length (0.309" vs 0.244") and insulation height (0.099" vs 0.034"), suitable for applications requiring extended mating depth without shrouding.

FTSH-125-01-F-D-K combines the extended contact geometry of the FTSH series with shrouded design and keying shroud feature, providing mechanical guidance and polarization capability while maintaining identical electrical performance.

All parts are ROHS3 compliant and actively produced by Samtec Inc.

Frequently Asked Questions (FAQ)

Q: Can FTS-125-01-F-D be used as a direct replacement for FTS-125-01-FM-D?

A: Yes. Both parts share identical electrical and mechanical specifications including pitch, contact count, contact material, insulation material, operating temperature range, and current rating. The series designation difference does not affect compatibility.

Q: What is the difference between unshrouded (FTS) and shrouded (FTSH) variants?

A: Unshrouded variants (FTS series) provide open access to contacts with overall contact length of 0.244" and insulation height of 0.034". Shrouded variants (FTSH series) feature protective shrouding with increased overall contact length of 0.309" and insulation height of 0.099". Shrouding provides mechanical guidance and polarization but requires compatible mating connectors.

Q: Is the FTS-125-01-F-D-P suitable for manual assembly?

A: Yes. The pick-and-place feature is a manufacturing characteristic that does not restrict manual assembly. The part maintains all standard electrical and mechanical specifications.

Q: Can FTSH-125-01-F-D-K be used in applications designed for unshrouded connectors?

A: No. The keying shroud and increased contact geometry of the FTSH-125-01-F-D-K require compatible mating connectors with corresponding shroud design. Physical interference may occur with unshrouded mating connectors.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed parts, including FTS-125-01-FM-D, FTS-125-01-F-D, FTS-125-01-F-D-P, FTSH-125-01-F-D, and FTSH-125-01-F-D-K, are ROHS3 compliant and actively produced.

Q: What determines electrical compatibility between these parts?

A: Electrical compatibility is determined by identical contact material (phosphor bronze), contact finish (gold mating, tin post), pitch spacing (0.050"), contact count (50 positions), current rating (3.4A per contact), and operating temperature range (-55°C to 125°C). All listed substitutes meet these criteria.

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