TSW-125-14-L-S Equivalent & Substitute Parts

Part Overview

The TSW-125-14-L-S is a rectangular connector header manufactured by Samtec Inc., designed for through-hole mounting applications. This connector features 25 positions with 0.100" (2.54mm) pitch spacing and is classified as an unshrouded, board-to-board or cable connector with male pin contacts. The part maintains active product status with 723 units currently in stock.

Substitute parts become necessary when the primary component reaches end-of-life status, experiences supply chain constraints, or when design requirements permit alternative configurations that maintain functional compatibility within specified electrical and mechanical parameters.

Substiute Parts

TSW-125-14-L-S

Samtec Inc.In Stock: 779TSW-125-14-L-S Datasheet

Current PartRFQ

4-103321-0

TE Connectivity AMP ConnectorsIn Stock: 10234-103321-0 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TSW-125-14-L-S is determined by the following critical parameters:

Primary Compatibility Criteria:

• Pitch - Mating: 0.100" (2.54mm) — must match exactly for PCB footprint compatibility
• Contact Type: Male Pin — determines mating interface requirements
• Mounting Type: Through Hole — establishes board assembly method
• Termination: Solder — specifies connection method to PCB
• Fastening Type: Push-Pull — defines mechanical engagement mechanism

Secondary Compatibility Criteria:

• Contact Shape: Square — affects contact retention and alignment
• Insulation Material: Polybutylene Terephthalate (PBT) or equivalent thermoplastic — ensures mechanical and thermal stability
• Operating Temperature Range: Must encompass or exceed -55°C ~ 125°C
• Material Flammability Rating: UL94 V-0 — meets safety requirements
• RoHS Compliance: ROHS3 or equivalent — satisfies regulatory requirements

The substitute part 4-103321-0 (TE Connectivity AMP Connectors AMPMODU Mod II series) shares the core mating pitch, contact type, mounting method, and termination approach. However, this substitute exhibits differences in position count (40 vs. 25), insulation material composition (thermoplastic vs. PBT), operating temperature range (-65°C ~ 105°C vs. -55°C ~ 125°C), and product status (obsolete vs. active).

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (TSW-125-14-L-S): The TSW-125-14-L-S maintains active product status with established supply availability. This part is ROHS3 compliant and operates across the extended temperature range of -55°C ~ 125°C. Selection of this part is appropriate for new designs and applications requiring long-term component availability and regulatory compliance assurance.

Substitute Part Consideration (4-103321-0): The 4-103321-0 is classified as obsolete and carries non-applicable RoHS status, indicating this component predates current regulatory frameworks. The operating temperature range (-65°C ~ 105°C) does not fully encompass the upper temperature specification of the primary part. The 40-position configuration exceeds the 25-position requirement of the primary part, necessitating PCB layout modification and potential cost increase. This substitute is suitable only for legacy system maintenance or applications where the reduced upper temperature limit and non-RoHS status present no design constraints.

Frequently Asked Questions (FAQ)

Q: Can the 4-103321-0 directly replace the TSW-125-14-L-S in new designs?

A: Direct replacement is not recommended for new designs. The substitute part is obsolete, lacks ROHS3 compliance, and operates to a maximum temperature of 105°C compared to the primary part's 125°C specification. Additionally, the 40-position configuration requires PCB redesign for a 25-position application.

Q: What is the significance of the pitch specification in connector substitution?

A: The 0.100" (2.54mm) pitch specification defines the center-to-center spacing between contact positions on the PCB footprint. Both the primary and substitute parts share this pitch, ensuring mechanical compatibility at the mating interface. Pitch mismatch renders connectors physically incompatible regardless of other parameter alignment.

Q: How does the position count difference affect substitution viability?

A: The primary part provides 25 positions while the substitute offers 40 positions. This difference requires modification to the PCB layout, connector footprint, and potentially the mating connector configuration. Applications designed for 25-position connectivity cannot utilize the additional 15 positions without circuit redesign.

Q: What is the impact of contact finish differences between these parts?

A: The primary part features gold-plated mating contacts (10.0µin thickness) while the substitute uses tin-lead plating (100.0µin thickness). Gold plating provides superior corrosion resistance and contact reliability in low-signal applications. Tin-lead plating is acceptable for general-purpose applications but may exhibit higher contact resistance over extended operational life in corrosive environments.

Q: Does the operating temperature range difference present a compatibility issue?

A: The primary part operates from -55°C to 125°C while the substitute operates from -65°C to 105°C. Applications requiring operation above 105°C cannot use the substitute part. The primary part's extended upper temperature range is necessary for high-temperature industrial and automotive applications.

Q: What does the obsolete product status of the substitute part indicate?

A: Obsolete status indicates the manufacturer has discontinued production and support for this component. Existing inventory may be available through secondary distributors, but long-term supply cannot be assured. New designs should not incorporate obsolete components due to supply chain risk and lack of manufacturer technical support.