HTST-112-04-L-D-RA Equivalent & Substitute Parts

Part Overview

The HTST-112-04-L-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 of -55°C to 125°C and is currently in active production status. The connector 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 experiences supply constraints, extended lead times, or when design requirements permit alternative connector architectures that maintain functional compatibility within the specified electrical and mechanical parameters.

Substiute Parts

HTST-112-04-L-D-RA

Samtec Inc.In Stock: 925HTST-112-04-L-D-RA Datasheet

Current PartRFQ

2-1761605-8

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HTST-112-04-L-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
• Contact Material: Phosphor Bronze
• Material Flammability Rating: UL94 V-0

Allowable Variation Parameters:

• Insulation Material (LCP or PBT acceptable)
• Operating Temperature Range (minimum -55°C, maximum 125°C required)
• Current Rating (must meet or exceed 3.4A per contact)
• Contact Finish Thickness - Mating (variation permitted)
• Insulation Height (minor dimensional tolerance)
• Contact Length - Mating and Post (within mechanical compatibility)
• Insulation Color (functional equivalence)

The substitute part 2-1761605-8 from TE Connectivity AMP Connectors meets the mandatory matching parameters and operates within the allowable variation range, though with noted differences in current rating and operating temperature ceiling.

Parameter Comparison

Engineering Selection Recommendations

Primary Part - HTST-112-04-L-D-RA (Samtec Inc.): This connector is the preferred selection for new designs and ongoing production. The part maintains active product status with confirmed inventory availability of 846 units. It delivers the specified 3.4A per contact current rating and operates across the full -55°C to 125°C temperature range. ROHS3 compliance and UL94 V-0 flammability rating satisfy regulatory requirements. The LCP insulation material provides superior thermal and chemical resistance characteristics.

Substitute Part - 2-1761605-8 (TE Connectivity AMP Connectors): This part is classified as obsolete and carries significant supply risk. The current rating of 1A per contact falls below the primary part specification of 3.4A per contact, restricting its use to applications with reduced current demands. The maximum operating temperature of 105°C is lower than the primary part's 125°C ceiling, limiting thermal performance envelope. The substitute maintains ROHS3 compliance and UL94 V-0 flammability rating. Substitution is permissible only when application requirements align with the reduced electrical and thermal specifications, and when supply of the primary part is unavailable.

Frequently Asked Questions (FAQ)

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

A: The 2-1761605-8 shares identical mechanical and mating interface specifications, including 24 positions, 2.54mm pitch, right-angle mounting, and push-pull fastening. However, the substitute part has a reduced current rating of 1A per contact versus 3.4A for the primary part, and a lower maximum operating temperature of 105°C versus 125°C. Direct substitution is only valid when application current and temperature requirements do not exceed the substitute part's specifications.

Q: What are the key differences between these connectors?

A: The primary differences are: (1) Current Rating: HTST-112-04-L-D-RA rated at 3.4A per contact; 2-1761605-8 rated at 1A per contact; (2) Operating Temperature: HTST-112-04-L-D-RA operates -55°C to 125°C; 2-1761605-8 operates -65°C to 105°C; (3) Insulation Material: HTST-112-04-L-D-RA uses LCP; 2-1761605-8 uses PBT; (4) Product Status: HTST-112-04-L-D-RA is active; 2-1761605-8 is obsolete; (5) Contact Finish Thickness: HTST-112-04-L-D-RA has 10.0µin mating finish; 2-1761605-8 has 30.0µin mating finish.

Q: Are both connectors RoHS compliant?

A: Yes, both the HTST-112-04-L-D-RA and 2-1761605-8 are ROHS3 compliant and carry UL94 V-0 flammability ratings, meeting standard regulatory requirements for electronic component applications.

Q: What is the impact of the different insulation materials?

A: The HTST-112-04-L-D-RA uses Liquid Crystal Polymer (LCP) insulation, while the 2-1761605-8 uses Polybutylene Terephthalate (PBT). LCP provides superior thermal stability and chemical resistance, supporting the higher operating temperature range. PBT is a standard engineering plastic suitable for general applications but with more limited thermal performance.

Q: Why is the substitute part listed as obsolete?

A: The 2-1761605-8 is classified as obsolete by TE Connectivity, indicating it is no longer in active production. While inventory may be available through distribution channels, long-term supply cannot be guaranteed. The primary part HTST-112-04-L-D-RA maintains active status with confirmed ongoing production and supply availability.

Q: Can I use the substitute part in high-current applications?

A: No. The 2-1761605-8 is rated at 1A per contact, which is insufficient for applications requiring the 3.4A per contact capability of the HTST-112-04-L-D-RA. Using the substitute part in high-current applications would exceed its electrical specifications and create reliability and safety risks.

Q: Are the mechanical dimensions compatible for PCB mounting?

A: Both connectors share identical pitch (2.54mm), row spacing (2.54mm), and right-angle through-hole mounting specifications. However, the contact length and insulation height differ slightly. The HTST-112-04-L-D-RA has a mating contact length of 0.250" (6.35mm) and insulation height of 0.365" (9.27mm), while the 2-1761605-8 has 0.240" (6.10mm) and 0.350" (8.89mm) respectively. These dimensional differences may affect mating depth and clearance in space-constrained designs.