ESQ-120-44-S-D Equivalent & Substitute Parts

Part Overview

The ESQ-120-44-S-D is a 40-position elevated socket connector manufactured by Samtec Inc., designed for board-to-board applications with 0.100" (2.54mm) pitch spacing. This through-hole solder-terminated connector features forked contacts with gold mating finish and tin post finish, operating across -55°C to 125°C. The product is active and ROHS3 compliant, making it suitable for applications requiring reliable interconnection in industrial and commercial environments. Substitute parts may be required due to inventory availability, specific finish requirements, or design optimization needs.

Substiute Parts

ESQ-120-44-S-D

Samtec Inc.In Stock: 1041ESQ-120-44-S-D Datasheet

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ESQ-120-44-G-D

Samtec Inc.In Stock: 1357ESQ-120-44-G-D Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The ESQ-120-44-S-D has one identified substitute: ESQ-120-44-G-D. Substitution eligibility is determined by the following critical parameters that must remain constant:

• Connector Type: Elevated Socket
• Number of Positions: 40
• Pitch - Mating: 0.100" (2.54mm)
• Number of Rows: 2
• Row Spacing - Mating: 0.100" (2.54mm)
• Mounting Type: Through Hole
• Termination: Solder
• Fastening Type: Push-Pull
• Insulation Color: Black
• Insulation Height: 0.735" (18.67mm)
• Contact Length - Post: 0.180" (4.57mm)
• Operating Temperature: -55°C ~ 125°C
• Material Flammability Rating: UL94 V-0
• Current Rating: 5.7A per Contact
• Voltage Rating: 550VAC
• Insulation Material: Liquid Crystal Polymer (LCP)
• Contact Shape: Square
• Contact Material: Phosphor Bronze
• Base Product Number: ESQ-120
• RoHS Status: ROHS3 Compliant

The substitute part differs only in contact finish specifications and post finish material, which do not affect core electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both ESQ-120-44-S-D and ESQ-120-44-G-D are active products with ROHS3 compliance and identical electrical and mechanical specifications. Selection between these parts should be based on the following factors:

The ESQ-120-44-S-D features tin post finish with 30.0µin (0.76µm) gold mating contact thickness. The ESQ-120-44-G-D features gold post finish with 20.0µin (0.51µm) gold mating contact thickness. Both configurations meet the same voltage and current ratings, operating temperature range, and flammability requirements. The choice between tin and gold post finishes depends on application-specific soldering processes and long-term reliability requirements in the target environment. Both parts maintain full compliance with regulatory standards and are suitable for direct substitution in board-to-board connector applications.

Frequently Asked Questions (FAQ)

Q: Can ESQ-120-44-G-D be used as a direct replacement for ESQ-120-44-S-D?

A: Yes. Both parts share identical connector type, position count, pitch spacing, mounting method, and electrical ratings. The difference in post finish (gold versus tin) does not affect mechanical or electrical compatibility.

Q: What is the difference between the contact finishes on these parts?

A: The ESQ-120-44-S-D has tin post finish with 30.0µin (0.76µm) gold mating contact thickness. The ESQ-120-44-G-D has gold post finish with 20.0µin (0.51µm) gold mating contact thickness. Both provide adequate contact resistance and durability for the specified voltage and current ratings.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both ESQ-120-44-S-D and ESQ-120-44-G-D operate across -55°C to 125°C and maintain UL94 V-0 flammability rating across this range.

Q: Do these parts have the same packaging?

A: Yes. Both parts are supplied in tube packaging and are ROHS3 compliant.

Q: What determines whether a part can substitute for the ESQ-120-44-S-D?

A: Substitute parts must maintain the same connector type (elevated socket), position count (40), pitch spacing (0.100"), row configuration (2 rows), mounting method (through hole), termination type (solder), and electrical ratings (5.7A per contact, 550VAC). Variations in contact finish specifications do not prevent substitution.