TSW-121-08-G-D-RA Equivalent & Substitute Parts

Part Overview

The TSW-121-08-G-D-RA is a rectangular connector header manufactured by Samtec Inc., designed for through-hole, right-angle board-to-board or cable applications. This 42-position connector operates across a wide temperature range of -55°C to 125°C and features gold-plated phosphor bronze contacts with 0.100" (2.54mm) pitch spacing. The part maintains active product status with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts become necessary when addressing inventory constraints, obsolescence concerns, or specific application requirements that demand alternative mechanical or electrical configurations.

Substiute Parts

TSW-121-08-G-D-RA

Samtec Inc.In Stock: 1114TSW-121-08-G-D-RA Datasheet

Current PartRFQ

4-103186-0

TE Connectivity AMP ConnectorsIn Stock: 1263394-103186-0 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TSW-121-08-G-D-RA is determined by the following critical parameters:

• Pitch - Mating: 0.100" (2.54mm) - must match exactly for mechanical compatibility
• Contact Type: Male Pin - determines mating interface
• Mounting Type: Through Hole - establishes PCB assembly method
• Termination: Solder - defines connection mechanism
• Number of Rows: 2 - establishes physical layout
• Operating Temperature Range: -55°C ~ 125°C - defines thermal operating envelope
• Contact Material and Finish: Phosphor Bronze with Gold plating - ensures electrical performance and corrosion resistance
• Insulation Material: PBT - provides mechanical and thermal stability

The substitute part 4-103186-0 (TE Connectivity AMP Connectors) shares the core mating pitch, contact type, row configuration, and termination method. However, this part exhibits significant deviations in position count (80 vs. 42), mounting orientation (vertical vs. right-angle), operating temperature range (-65°C ~ 105°C vs. -55°C ~ 125°C), contact post finish (Tin-Lead vs. Gold), and product status (Obsolete vs. Active). These differences establish it as a functional alternative only under specific application constraints where position count expansion and vertical mounting are acceptable trade-offs.

Parameter Comparison

Engineering Selection Recommendations

The TSW-121-08-G-D-RA maintains active product status with full ROHS3 compliance, making it the preferred choice for new designs and applications requiring regulatory adherence. The part's extended upper operating temperature limit of 125°C provides thermal margin for demanding industrial and automotive environments.

The substitute part 4-103186-0 carries obsolete product status and RoHS non-compliance, restricting its application to legacy system maintenance or retrofit scenarios where regulatory requirements do not apply. The reduced upper operating temperature of 105°C and tin-lead post finish present additional constraints for high-temperature applications. The increased position count (80 vs. 42) and vertical mounting orientation require significant PCB layout modifications and are suitable only when expanded connectivity is a design requirement.

For new product development, the TSW-121-08-G-D-RA is the appropriate selection. For legacy system support where the TSW-121-08-G-D-RA is unavailable, 4-103186-0 may serve as a functional alternative only after verification that the application tolerates reduced temperature range, vertical mounting geometry, and RoHS non-compliance status.

Frequently Asked Questions (FAQ)

Q: Can 4-103186-0 be used as a direct drop-in replacement for TSW-121-08-G-D-RA?

A: No. While both connectors share 0.100" (2.54mm) pitch and 2-row configuration, the substitute differs in mounting orientation (vertical vs. right-angle), position count (80 vs. 42), and operating temperature range. PCB layout and mechanical design modifications are required.

Q: What are the critical compatibility parameters between these connectors?

A: Mating pitch (0.100" / 2.54mm), contact type (Male Pin), number of rows (2), termination method (Solder), and contact finish (Gold) establish the substitution basis. Deviations in mounting type, position count, and temperature range require application-specific evaluation.

Q: Why is 4-103186-0 marked as obsolete?

A: Product obsolescence is determined by the manufacturer. The TE Connectivity AMP Connectors AMPMODU Mod II series has reached end-of-life status. Inventory availability may vary by distributor, but new production is not guaranteed.

Q: Does RoHS compliance affect substitution eligibility?

A: Yes. The TSW-121-08-G-D-RA is ROHS3 compliant, while 4-103186-0 is RoHS non-compliant. Applications subject to RoHS regulations (EU, California, and other jurisdictions) must use the compliant part. Non-compliant substitutes are restricted to legacy or non-regulated applications.

Q: What is the impact of the different operating temperature ranges?

A: The TSW-121-08-G-D-RA operates from -55°C to 125°C, while 4-103186-0 operates from -65°C to 105°C. Applications requiring sustained operation above 105°C must use the TSW-121-08-G-D-RA. The substitute provides lower temperature capability but reduced upper thermal margin.

Q: Can the increased position count of 4-103186-0 be utilized in applications requiring fewer connections?

A: Yes, but only if PCB layout accommodates the larger connector footprint and vertical mounting geometry. Unused positions do not affect electrical performance of active connections, provided the connector is properly seated and soldered.