TSW-125-07-L-S Equivalent & Substitute Parts

Part Overview

The TSW-125-07-L-S is a rectangular connector header manufactured by Samtec Inc., designed for through-hole mounting applications. This connector features 25 positions at 0.100" (2.54mm) pitch and is classified as an unshrouded, board-to-board or cable connector with male pin contacts. The part maintains active product status with full inventory availability.

Substitute parts become necessary when the primary part reaches end-of-life status, when design requirements shift toward alternative form factors, or when supply chain constraints require qualified alternatives that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Pitch - Mating	0.100" (2.54mm)
Number of Positions	25
Number of Rows	1
Mounting Type	Through Hole
Termination	Solder
Contact Finish - Mating	Gold
Operating Temperature Range	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

The substitute part 4-103185-0 (TE Connectivity AMP Connectors) shares the following critical parameters with the TSW-125-07-L-S:

Pitch - Mating: 0.100" (2.54mm)
Connector Type: Header with male pin contacts
Mounting Type: Through Hole
Termination: Solder
Contact Finish - Mating: Gold
Material Flammability Rating: UL94 V-0
Moisture Sensitivity Level: 1 (Unlimited)

The primary difference is position count: the substitute provides 40 positions versus 25 positions in the main part. This difference permits substitution only in applications where the increased position count does not create mechanical or electrical conflicts within the target assembly. The substitute part is classified as Obsolete, indicating it is no longer in active production.

Parameter Comparison

Parameter	TSW-125-07-L-S (Samtec)	4-103185-0 (TE Connectivity)
Manufacturer	Samtec Inc.	TE Connectivity AMP Connectors
Series	TSW	AMPMODU Mod II
Product Status	Active	Obsolete
Connector Type	Header	Header, Breakaway
Contact Type	Male Pin	Male Pin
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)
Number of Positions	25	40
Number of Rows	1	1
Mounting Type	Through Hole	Through Hole
Termination	Solder	Solder
Contact Length - Mating	0.230" (5.84mm)	0.230" (5.84mm)
Contact Length - Post	0.100" (2.54mm)	0.120" (3.05mm)
Overall Contact Length	0.430" (10.92mm)	0.440" (11.18mm)
Insulation Height	0.100" (2.54mm)	0.090" (2.29mm)
Contact Shape	Square	Square
Contact Finish - Mating	Gold	Gold
Contact Finish Thickness - Mating	10.0µin (0.25µm)	15.0µin (0.38µm)
Contact Finish - Post	Tin	Tin-Lead
Contact Material	Phosphor Bronze	Copper Alloy
Insulation Material	Polybutylene Terephthalate (PBT)	Thermoplastic
Operating Temperature	-55°C ~ 125°C	-65°C ~ 105°C
Material Flammability Rating	UL94 V-0	UL94 V-0
Insulation Color	Black	Black
Current Rating (Amps)	Not specified	3A
RoHS Status	ROHS3 Compliant	Not applicable
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99
HTSUS	8536.69.4040	8536.69.4040

Engineering Selection Recommendations

The TSW-125-07-L-S maintains active product status with ROHS3 compliance and unlimited moisture sensitivity rating, making it the preferred choice for new designs and applications requiring current regulatory compliance.

The substitute part 4-103185-0 is classified as Obsolete and carries "Not applicable" RoHS status, indicating it does not meet current regulatory requirements. This part should be considered only in legacy system maintenance or retrofit scenarios where the original connector specification cannot be modified.

Key selection criteria:

For new designs: Use TSW-125-07-L-S (active status, ROHS3 compliant)
For legacy systems: 4-103185-0 may be used only if position count increase (25 to 40) does not conflict with mechanical constraints or electrical routing
Temperature range consideration: TSW-125-07-L-S supports -55°C to 125°C; 4-103185-0 supports -65°C to 105°C
Contact post length differs by 0.020" (0.51mm), requiring PCB layout verification

Frequently Asked Questions (FAQ)

Q: Can 4-103185-0 be used as a direct replacement for TSW-125-07-L-S?

A: Direct replacement is not possible due to position count difference (40 vs. 25). The substitute can only be used if the application design permits the increased position count and if mechanical clearance exists on the PCB.

Q: What is the primary difference between these connectors?

A: The main difference is the number of positions: TSW-125-07-L-S provides 25 positions, while 4-103185-0 provides 40 positions. Both share identical 0.100" (2.54mm) pitch and through-hole solder termination.

Q: Are there compliance differences?

A: Yes. TSW-125-07-L-S is ROHS3 compliant and suitable for current regulatory environments. 4-103185-0 is Obsolete with "Not applicable" RoHS status, making it unsuitable for new designs requiring regulatory compliance.

Q: What is the contact post length difference?

A: TSW-125-07-L-S has a contact post length of 0.100" (2.54mm), while 4-103185-0 has 0.120" (3.05mm). This 0.020" (0.51mm) difference requires PCB hole depth verification during substitution.

Q: Can these connectors be used in high-temperature applications?

A: TSW-125-07-L-S supports -55°C to 125°C. 4-103185-0 supports -65°C to 105°C. For applications exceeding 105°C, only TSW-125-07-L-S is suitable.

Q: What is the difference in contact finish thickness?

A: TSW-125-07-L-S has 10.0µin (0.25µm) gold plating on mating contacts. 4-103185-0 has 15.0µin (0.38µm), providing thicker gold plating for enhanced durability in high-cycle mating applications.

Q: Are the insulation materials compatible?

A: TSW-125-07-L-S uses Polybutylene Terephthalate (PBT), while 4-103185-0 uses generic Thermoplastic. Both materials meet UL94 V-0 flammability requirements, but PBT offers superior dimensional stability and chemical resistance.

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