TSW-131-07-L-S Equivalent & Substitute Parts

Part Overview

The TSW-131-07-L-S is a rectangular connector header manufactured by Samtec Inc., designed for through-hole mounting applications. This 31-position, single-row header operates at 0.100" (2.54mm) pitch and is rated for operating temperatures from -55°C to 125°C. The part maintains Active product status with full inventory availability. Substitute parts are necessary when the original part becomes unavailable, when design requirements shift toward different position counts, or when alternative manufacturer sourcing is required for supply chain optimization.

Substiute Parts

TSW-131-07-L-S

Samtec Inc.In Stock: 1037TSW-131-07-L-S Datasheet

Current PartRFQ

4-103185-0

TE Connectivity AMP ConnectorsIn Stock: 15934-103185-0 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TSW-131-07-L-S is determined by the following critical parameters:

• Pitch - Mating: 0.100" (2.54mm) — must remain constant for PCB footprint compatibility
• Connector Type: Header with male pin contact configuration
• Mounting Type: Through Hole solder termination
• Number of Rows: Single row configuration
• Contact Material and Finish: Gold-plated mating surface with tin post finish
• Insulation Material: Polybutylene Terephthalate (PBT) or equivalent thermoplastic
• Operating Temperature Range: Minimum -55°C to 125°C capability
• Material Flammability: UL94 V-0 rating

The substitute part 4-103185-0 (TE Connectivity AMP Connectors) shares the core electrical and mechanical interface characteristics but differs in position count (40 vs. 31 positions) and operating temperature range (-65°C to 105°C vs. -55°C to 125°C). This part is listed as a manufacturer-recommended substitute despite these differences, indicating it may be used in applications where the higher position count and lower maximum temperature do not conflict with design requirements.

Parameter Comparison

Engineering Selection Recommendations

The TSW-131-07-L-S remains the preferred choice for new designs due to its Active product status, ROHS3 compliance, and extended operating temperature range to 125°C. The part is currently in stock with 958 units available.

The substitute part 4-103185-0 carries Obsolete product status and lacks RoHS3 compliance documentation. Its use is limited to legacy system maintenance or applications where the 40-position configuration and reduced maximum operating temperature (-65°C to 105°C) are acceptable. The higher position count requires PCB layout modification and may introduce unnecessary complexity in applications requiring only 31 positions. The contact post finish differs (Tin-Lead vs. Tin), which may affect solder joint characteristics and long-term reliability in certain environmental conditions.

For new designs and ongoing production, the TSW-131-07-L-S is the recommended selection. Substitution to 4-103185-0 should occur only when the original part becomes unavailable and design constraints permit the noted parameter variations.

Frequently Asked Questions (FAQ)

Q: Can the 4-103185-0 be used as a direct drop-in replacement for the TSW-131-07-L-S?

A: No. While both parts share the same 0.100" (2.54mm) pitch and through-hole solder termination, the 4-103185-0 has 40 positions versus 31 positions in the TSW-131-07-L-S. This requires PCB footprint modification. Additionally, the operating temperature maximum differs (105°C vs. 125°C), which may disqualify it for high-temperature applications.

Q: What are the key compatibility factors between these two parts?

A: Compatibility is determined by: matching 0.100" (2.54mm) pitch for PCB hole spacing, single-row header configuration, through-hole solder mounting, male pin contact type, and gold-plated mating surface finish. Both parts meet UL94 V-0 flammability requirements.

Q: Why is the substitute part listed as Obsolete?

A: The 4-103185-0 (AMPMODU Mod II series) has been discontinued by TE Connectivity. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. New designs should not incorporate obsolete parts.

Q: Does the difference in contact post length affect PCB assembly?

A: Yes. The 4-103185-0 has a 0.120" (3.05mm) post length compared to 0.100" (2.54mm) for the TSW-131-07-L-S. This 0.020" difference may affect solder joint formation and wave soldering parameters. PCB design verification is required if substitution occurs.

Q: Are there RoHS compliance differences between these parts?

A: Yes. The TSW-131-07-L-S is ROHS3 Compliant. The 4-103185-0 shows "Not applicable" RoHS status, indicating it predates RoHS requirements or lacks current compliance documentation. This may restrict its use in applications subject to RoHS regulations.

Q: What is the significance of the Tin-Lead finish on the 4-103185-0 posts?

A: The 4-103185-0 uses Tin-Lead post finish, which is an older specification. The TSW-131-07-L-S uses pure Tin finish, consistent with lead-free soldering standards. Tin-Lead finishes may introduce compatibility issues with lead-free solder processes and are restricted in many jurisdictions under RoHS regulations.