TSW-127-07-L-S Equivalent & Substitute Parts

Part Overview

The TSW-127-07-L-S is a rectangular connector header manufactured by Samtec Inc., designed for through-hole mounting applications. This 27-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 RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

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

Substiute Parts

TSW-127-07-L-S

Samtec Inc.In Stock: 996TSW-127-07-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-127-07-L-S is determined by the following critical parameters:

Primary Compatibility Criteria:

• Pitch - Mating: 0.100" (2.54mm) — must match exactly
• Contact Type: Male Pin — must match exactly
• Mounting Type: Through Hole — must match exactly
• Termination: Solder — must match exactly
• Contact Finish - Mating: Gold — must match exactly
• Insulation Material: Polybutylene Terephthalate (PBT) or equivalent thermoplastic
• Material Flammability Rating: UL94 V-0 — must match or exceed
• Connector Type: Header (with or without breakaway feature)

Secondary Compatibility Considerations:

• Number of Positions: May vary based on application requirements
• Operating Temperature Range: Substitute must support the application's thermal requirements
• Contact Finish - Post: Tin or Tin-Lead acceptable for solder termination
• RoHS Compliance: ROHS3 or equivalent compliance required

The substitute part 4-103185-0 (TE Connectivity AMP Connectors) meets all primary compatibility criteria with the following variations: 40-position configuration (versus 27-position), breakaway feature inclusion, and narrower operating temperature range (-65°C to 105°C versus -55°C to 125°C).

Parameter Comparison

Engineering Selection Recommendations

TSW-127-07-L-S (Primary Selection): The TSW-127-07-L-S maintains Active product status with full RoHS3 compliance and extended operating temperature range (-55°C to 125°C). This part is suitable for new designs and applications requiring long-term availability and regulatory compliance in high-temperature environments.

4-103185-0 (Substitute Selection): The 4-103185-0 is classified as Obsolete and carries no RoHS compliance designation. This part is suitable only for legacy system maintenance, repair, or replacement scenarios where the 27-position configuration is not required. The 40-position configuration and breakaway feature provide additional flexibility for applications requiring higher pin counts. The narrower operating temperature range (-65°C to 105°C) must be evaluated against application thermal requirements. The Tin-Lead contact finish on the post may present compatibility considerations in RoHS-restricted environments.

Selection between these parts depends on: (1) application position count requirements, (2) operating temperature range specifications, (3) regulatory compliance mandates, and (4) long-term supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can the 4-103185-0 directly replace the TSW-127-07-L-S in existing designs?

A: Direct replacement is not recommended without design review. While both parts share identical pitch (0.100" / 2.54mm), contact type (Male Pin), mounting method (Through Hole), and termination (Solder), the 4-103185-0 provides 40 positions versus 27 positions. PCB layout modifications are required if the design utilizes all 40 positions. If only 27 positions are used, the breakaway feature allows removal of excess pins, but this requires mechanical modification and validation.

Q: What are the thermal operating range differences?

A: The TSW-127-07-L-S operates from -55°C to 125°C, while the 4-103185-0 operates from -65°C to 105°C. Applications requiring operation above 105°C must use the TSW-127-07-L-S. Applications operating below -55°C can use either part, though the 4-103185-0 provides extended low-temperature capability.

Q: Are there RoHS compliance implications?

A: The TSW-127-07-L-S is ROHS3 compliant. The 4-103185-0 carries "Not applicable" RoHS status due to its Obsolete classification. Applications subject to RoHS regulations must use the TSW-127-07-L-S or verify exemption applicability for the 4-103185-0.

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

A: The 4-103185-0 uses Tin-Lead finish on the post (solder tail), while the TSW-127-07-L-S uses pure Tin. Tin-Lead finishes are restricted in RoHS-regulated applications. Soldering characteristics may differ slightly, requiring process validation if substituting into existing assembly procedures.

Q: Can I use only a portion of the 40 positions on the 4-103185-0?

A: Yes. The 4-103185-0 includes a breakaway feature, allowing removal of unused pin sections. However, mechanical breakage must be performed carefully to avoid damaging remaining pins or the insulation body. This approach is suitable for prototyping or low-volume applications but is not recommended for production designs where the TSW-127-07-L-S 27-position configuration provides exact fit.

Q: What contact material differences exist between these parts?

A: The TSW-127-07-L-S uses Phosphor Bronze contacts, while the 4-103185-0 uses Copper Alloy contacts. Both materials are acceptable for 0.100" pitch headers with gold mating finish. Contact resistance and mechanical durability are comparable for standard applications.