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

Part Overview

The TSW-125-07-S-D is a rectangular connector header manufactured by Samtec Inc., designed for through-hole board-to-board or cable applications. This 50-position, 2-row 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 maintains active product status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts become necessary when the TSW-125-07-S-D reaches end-of-life status, inventory constraints occur, or design requirements necessitate alternative connector configurations with compatible electrical and mechanical parameters.

Key Parameters

Parameter	Value
Connector Type	Header
Contact Type	Male Pin
Pitch - Mating	0.100" (2.54mm)
Number of Positions	50
Number of Rows	2
Row Spacing - Mating	0.100" (2.54mm)
Mounting Type	Through Hole
Termination	Solder
Contact Finish - Mating	Gold
Contact Finish - Post	Tin
Operating Temperature	-55°C ~ 125°C
Material Flammability Rating	UL94 V-0
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the TSW-125-07-S-D is determined by the following critical parameters:

Primary Compatibility Criteria:

Pitch - Mating: 0.100" (2.54mm) — must match exactly
Row Spacing - Mating: 0.100" (2.54mm) — must match exactly
Connector Type: Header with male pin contacts
Mounting Type: Through Hole with solder termination
Contact Finish: Gold-plated mating surface

Secondary Compatibility Considerations:

Number of Positions: 50 positions (exact match required for direct substitution)
Number of Rows: 2 rows (exact match required for direct substitution)
Operating Temperature Range: Must encompass or match the -55°C to 125°C specification
Material Flammability: UL94 V-0 rating required

The substitute part 4-103240-0 (TE Connectivity AMP Connectors) shares the same mating pitch, row spacing, connector type, and contact finish specifications. However, it differs in position count (80 vs. 50), row configuration, operating temperature range, and compliance status, requiring engineering evaluation for specific application contexts.

Parameter Comparison

Parameter	TSW-125-07-S-D (Samtec)	4-103240-0 (TE Connectivity)
Manufacturer	Samtec Inc.	TE Connectivity AMP Connectors
Connector Type	Header	Header, Breakaway
Contact Type	Male Pin	Male Pin
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)
Number of Positions	50	80
Number of Rows	2	2
Row Spacing - Mating	0.100" (2.54mm)	0.100" (2.54mm)
Mounting Type	Through Hole	Through Hole
Termination	Solder	Solder
Contact Finish - Mating	Gold	Gold
Contact Finish - Post	Tin	Tin-Lead
Operating Temperature	-55°C ~ 125°C	-65°C ~ 105°C
Material Flammability Rating	UL94 V-0	UL94 V-0
RoHS Status	ROHS3 Compliant	RoHS non-compliant
Product Status	Active	Obsolete

Engineering Selection Recommendations

TSW-125-07-S-D (Primary Selection): The TSW-125-07-S-D maintains active product status with full RoHS3 compliance, making it the preferred choice for new designs and applications requiring regulatory adherence. Its extended operating temperature range (-55°C to 125°C) supports demanding thermal environments. Tin-plated posts provide standard solder compatibility without lead content concerns.

4-103240-0 (Conditional Substitution): The 4-103240-0 is classified as obsolete and does not meet RoHS compliance requirements due to tin-lead post plating. Its operating temperature range (-65°C to 105°C) does not fully encompass the TSW-125-07-S-D specification, with a maximum temperature 20°C lower. The 80-position configuration exceeds the 50-position requirement, introducing potential footprint and assembly incompatibilities. This part is suitable only for legacy system maintenance or applications where RoHS compliance is not mandated and thermal requirements remain within its specified range.

Frequently Asked Questions (FAQ)

Q: Can the 4-103240-0 directly replace the TSW-125-07-S-D in new designs?

A: No. The 4-103240-0 is obsolete, RoHS non-compliant, and features a higher position count (80 vs. 50). Its maximum operating temperature is 20°C lower than the TSW-125-07-S-D. Direct substitution would require PCB redesign and regulatory reassessment.

Q: What are the critical parameters that must match for connector substitution?

A: Mating pitch (0.100" / 2.54mm), row spacing (0.100" / 2.54mm), number of rows (2), connector type (header with male pins), mounting method (through-hole), and termination type (solder) must remain constant. Position count and operating temperature range must be evaluated against specific application requirements.

Q: Does the tin-lead finish on the 4-103240-0 affect compatibility?

A: The tin-lead post finish is compatible with standard solder assembly processes but introduces lead content, making this part unsuitable for RoHS-regulated applications. The TSW-125-07-S-D uses lead-free tin plating, meeting modern environmental and regulatory standards.

Q: What is the significance of the "Breakaway" designation on the 4-103240-0?

A: The breakaway feature allows individual connector sections to be separated, providing design flexibility for modular applications. The TSW-125-07-S-D does not include this feature, representing a functional difference beyond position count.

Q: Can the 4-103240-0 be used in applications requiring -55°C operation?

A: No. The 4-103240-0 minimum operating temperature is -65°C, which exceeds the TSW-125-07-S-D specification of -55°C. However, the 4-103240-0 maximum temperature of 105°C falls short of the TSW-125-07-S-D maximum of 125°C, making it unsuitable for high-temperature applications.

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