TST-112-04-G-D-RA Equivalent & Substitute Parts

Part Overview

The TST-112-04-G-D-RA is a rectangular connector header manufactured by Samtec Inc., designed for through-hole, right-angle board-to-cable/wire applications. This 24-position connector operates across a wide temperature range (-55°C to 125°C) and is currently in active production status. The part features shrouded 4-wall construction with push-pull fastening and gold-plated mating contacts rated at 3.4A per contact.

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

Substiute Parts

TST-112-04-G-D-RA

Samtec Inc.In Stock: 1075TST-112-04-G-D-RA Datasheet

Current PartRFQ

2-1761605-8

TE Connectivity AMP ConnectorsIn Stock: 10542-1761605-8 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TST-112-04-G-D-RA is determined by strict alignment with the following critical parameters:

Mandatory Matching Parameters:

• Number of Positions: 24
• Number of Rows: 2
• Pitch - Mating: 0.100" (2.54mm)
• Row Spacing - Mating: 0.100" (2.54mm)
• Connector Type: Header
• Contact Type: Male Pin
• Mounting Type: Through Hole, Right Angle
• Shrouding: Shrouded - 4 Wall
• Fastening Type: Push-Pull
• Termination: Solder
• Contact Finish - Mating: Gold
• Insulation Material: Polybutylene Terephthalate (PBT)
• Material Flammability Rating: UL94 V-0

The substitute part 2-1761605-8 (TE Connectivity AMP Connectors) meets all mandatory matching parameters and is therefore classified as an equivalent substitute, despite differences in product status, operating temperature range, current rating, and contact finish specifications.

Parameter Comparison

Engineering Selection Recommendations

The TST-112-04-G-D-RA (Samtec Inc., Active status) is the primary specification for new designs and applications requiring the full operating temperature range of -55°C to 125°C and current rating of 3.4A per contact.

The 2-1761605-8 (TE Connectivity AMP Connectors, Obsolete status) is classified as an equivalent substitute based on matching mechanical and electrical interface parameters. However, the following differences must be evaluated for specific applications:

• Product Status: The substitute part is obsolete, limiting long-term availability and future procurement.
• Operating Temperature Range: The substitute operates within -65°C to 105°C, which is narrower at the upper limit (105°C vs. 125°C).
• Current Rating: The substitute is rated at 1A per contact, significantly lower than the primary part's 3.4A rating.
• Contact Dimensions: Mating and post contact lengths differ, which may affect mating force and connector stack height in specific applications.
• Contact Finish - Post: The substitute uses tin plating instead of gold, affecting solderability and long-term reliability characteristics.

Both parts maintain ROHS3 compliance, UL94 V-0 flammability rating, and unlimited moisture sensitivity level (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can the 2-1761605-8 be used as a direct replacement for the TST-112-04-G-D-RA?

A: The 2-1761605-8 is mechanically and electrically compatible at the interface level, sharing identical pitch, row spacing, position count, and connector type. However, application-specific requirements must be evaluated, particularly current rating (1A vs. 3.4A per contact), operating temperature range (-65°C to 105°C vs. -55°C to 125°C), and contact post finish (tin vs. gold).

Q: What are the critical parameters that determine substitution eligibility?

A: Substitution eligibility is determined by matching: number of positions (24), number of rows (2), mating pitch (0.100"/2.54mm), row spacing (0.100"/2.54mm), connector type (header), contact type (male pin), mounting type (through hole, right angle), shrouding (shrouded 4-wall), fastening type (push-pull), termination method (solder), mating contact finish (gold), insulation material (PBT), and flammability rating (UL94 V-0).

Q: Why does the substitute part have a lower current rating?

A: Current rating differences reflect design variations between manufacturers and series. The TST-112-04-G-D-RA is rated at 3.4A per contact, while the 2-1761605-8 is rated at 1A per contact. Applications requiring currents exceeding 1A per contact must use the primary part or identify alternative substitutes with higher current ratings.

Q: Is the substitute part still available for procurement?

A: The 2-1761605-8 is classified as obsolete. While inventory may exist through authorized distributors, long-term availability is not guaranteed. New designs should specify the TST-112-04-G-D-RA (active status) to ensure supply chain continuity.

Q: What is the impact of different contact post finishes?

A: The primary part uses gold plating on the post (3.00µin/0.076µm), while the substitute uses tin plating (100.0µin/2.54µm). Gold provides superior corrosion resistance and solderability over extended storage periods. Tin plating requires careful handling to prevent oxidation and may affect long-term reliability in high-humidity or corrosive environments.

Q: Are both parts RoHS compliant?

A: Both the TST-112-04-G-D-RA and 2-1761605-8 are ROHS3 compliant and carry EAR99 export classification. Both maintain unlimited moisture sensitivity level (MSL 1).