ICO-640-SST Equivalent & Substitute Parts

Part Overview

The ICO-640-SST is a 40-position DIP socket manufactured by Samtec Inc., designed for IC and transistor applications. This through-hole component features gold-plated mating contacts with beryllium copper material and tin-plated brass posts. The part is actively produced and ROHS3 compliant, with 750 units currently in stock. Equivalent and substitute parts are identified based on matching electrical and mechanical specifications within the DIP socket category, enabling component selection flexibility for circuit board assembly and prototyping applications.

Key Parameters

Parameter	ICO-640-SST Specification
Manufacturer	Samtec Inc.
Part Number	ICO-640-SST
Category	Sockets for ICs, Transistors
Type	DIP, 0.6" (15.24mm) Row Spacing
Number of Positions	40 (2 x 20)
Pitch - Mating	0.100" (2.54mm)
Pitch - Post	0.100" (2.54mm)
Contact Finish - Mating	Gold
Contact Finish - Post	Tin
Contact Material - Mating	Beryllium Copper
Contact Material - Post	Brass
Mounting Type	Through Hole
Termination Post Length	0.125" (3.18mm)
Operating Temperature	-55°C ~ 125°C
Current Rating	1 A
Contact Resistance	10mOhm
Housing Material	Polyester, Glass Filled
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the ICO-640-SST are identified based on the following critical parameters that must match or exceed the main part specifications:

Core Matching Criteria:

Number of Positions: 40 (2 x 20)
Type: DIP, 0.6" (15.24mm) Row Spacing
Pitch - Mating: 0.100" (2.54mm)
Pitch - Post: 0.100" (2.54mm)
Mounting Type: Through Hole
Termination Post Length: 0.125" (3.18mm)
Operating Temperature Range: -55°C ~ 125°C

Allowable Variations:

Contact Finish - Mating: Gold or Tin-Lead (alternative finishes acceptable)
Contact Finish - Post: Gold, Tin, or Tin-Lead (alternative finishes acceptable)
Contact Finish Thickness: Variations permitted within industry standards
Current Rating: 3 A acceptable (exceeds 1 A requirement)
Housing Material: Polycyclohexylenedimethylene Terephthalate (PCT) or Polyester acceptable
Features: Open Frame or Open Frame with Decoupling Capacitor acceptable

Compliance Considerations:

RoHS3 Compliant parts preferred; RoHS non-compliant parts listed with status noted
REACH Unaffected status maintained across all substitutes

Parameter Comparison

Part Number	Manufacturer	Positions	Mating Finish	Post Finish	Current Rating (A)	Operating Temp (°C)	RoHS Status	Inventory (Pcs)
ICO-640-SST	Samtec Inc.	40 (2x20)	Gold	Tin	1	-55 ~ 125	ROHS3 Compliant	750
110-13-640-41-001000	Mill-Max Manufacturing Corp.	40 (2x20)	Gold	Gold	3	-55 ~ 125	ROHS3 Compliant	911
110-13-640-41-801000	Mill-Max Manufacturing Corp.	40 (2x20)	Gold	Gold	3	-55 ~ 125	ROHS3 Compliant	732
110-41-640-41-001000	Mill-Max Manufacturing Corp.	40 (2x20)	Gold	Tin	3	-55 ~ 125	ROHS3 Compliant	1249
110-43-640-41-001000	Mill-Max Manufacturing Corp.	40 (2x20)	Gold	Tin	3	-55 ~ 125	ROHS3 Compliant	1917
110-43-640-41-801000	Mill-Max Manufacturing Corp.	40 (2x20)	Gold	Tin	3	-55 ~ 125	ROHS3 Compliant	951
110-44-640-41-001000	Mill-Max Manufacturing Corp.	40 (2x20)	Tin	Tin	3	-55 ~ 125	ROHS3 Compliant	989
110-93-640-41-001000	Mill-Max Manufacturing Corp.	40 (2x20)	Gold	Tin-Lead	3	-55 ~ 125	RoHS non-compliant	1272
110-93-640-41-801000	Mill-Max Manufacturing Corp.	40 (2x20)	Gold	Tin-Lead	3	-55 ~ 125	RoHS non-compliant	1023
110-99-640-41-001000	Mill-Max Manufacturing Corp.	40 (2x20)	Tin-Lead	Tin-Lead	3	-55 ~ 125	RoHS non-compliant	1103
111-93-640-41-001000	Mill-Max Manufacturing Corp.	40 (2x20)	Gold	Tin-Lead	3	-55 ~ 125	RoHS non-compliant	991

Engineering Selection Recommendations

ROHS3 Compliant Substitutes (Preferred for New Designs):

The following Mill-Max Manufacturing Corp. parts maintain ROHS3 compliance and are direct functional equivalents:

110-13-640-41-001000 and 110-13-640-41-801000: Gold mating and post finishes with 3 A current rating
110-41-640-41-001000: Gold mating finish with tin post finish, matching the ICO-640-SST contact finish configuration
110-43-640-41-001000 and 110-43-640-41-801000: Gold mating finish with tin post finish and enhanced current capacity

The 110-43-640-41-001000 variant offers the highest inventory availability (1917 units) among ROHS3 compliant options with matching contact finish specifications.

RoHS Non-Compliant Substitutes (Legacy Applications Only):

Parts 110-93-640-41-001000, 110-93-640-41-801000, 110-99-640-41-001000, and 111-93-640-41-001000 are RoHS non-compliant and are suitable only for applications where legacy component specifications are required. These parts feature tin-lead post finishes and are not recommended for new product designs subject to RoHS regulations.

Contact Finish Considerations:

The ICO-640-SST uses gold mating contacts with tin posts. ROHS3 compliant substitutes with identical finish specifications (110-41-640-41-001000 and 110-43-640-41-001000 series) provide the closest electrical and mechanical match. Alternatives with gold post finishes (110-13-640-41-001000 series) offer enhanced contact durability at the cost of different post finish material.

Frequently Asked Questions (FAQ)

Q: Can I substitute the ICO-640-SST with a Mill-Max 110-series socket?

A: Yes. All listed Mill-Max 110-series and 111-series parts are functionally equivalent substitutes. They share identical position count (40), row spacing (0.6"), pitch (0.100"), mounting type (through hole), and operating temperature range (-55°C to 125°C). The primary differences are contact finish configurations and current ratings, which are allowable variations for DIP socket applications.

Q: What is the difference between the 110-13, 110-41, and 110-43 series?

A: These series differ in contact finish specifications. The 110-13 series features gold post finishes, the 110-41 series features tin post finishes, and the 110-43 series features tin post finishes with enhanced thickness (200.0µin vs. standard specifications). All three series maintain gold mating contact finishes and are ROHS3 compliant.

Q: Why are some substitutes marked as RoHS non-compliant?

A: Parts 110-93, 110-99, and 111-93 series use tin-lead post finishes, which contain lead and do not meet ROHS3 compliance requirements. These parts are suitable only for legacy applications or systems not subject to RoHS regulations. New designs should specify ROHS3 compliant alternatives.

Q: Does the higher current rating (3 A vs. 1 A) affect compatibility?

A: No. A higher current rating indicates the substitute part can safely handle greater current loads. This is a beneficial specification that does not compromise compatibility with the original ICO-640-SST application, which operates at 1 A.

Q: What is the significance of the "-801000" suffix in part numbers?

A: The "-801000" suffix indicates the inclusion of a decoupling capacitor feature in the socket design. This is an additional feature that does not affect basic socket functionality or compatibility. Parts with and without this suffix are interchangeable for standard DIP socket applications.

Q: Are there inventory differences between substitutes?

A: Yes. Inventory levels vary across substitute parts. The 110-43-640-41-001000 offers the highest availability (1917 units), while 110-13-640-41-801000 has the lowest (732 units). Inventory status should be confirmed at the time of component procurement.

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