ICO-318-SGT DIP Socket 18-Position Equivalent & Substitute Parts

Part Overview

The ICO-318-SGT is an 18-position DIP socket manufactured by Samtec Inc., designed for through-hole mounting of dual inline package integrated circuits. This connector features gold-plated beryllium copper mating contacts with tin-plated brass posts, operating across the industrial temperature range of -55°C to 125°C. The part is ROHS3 compliant and carries an active product status.

Equivalent and substitute parts are identified based on matching electrical and mechanical specifications: 18-position DIP configuration, 0.3" row spacing, 0.100" pitch, through-hole termination, and compatible operating temperature range. Substitutes from Mill-Max Manufacturing Corp. provide functionally equivalent alternatives with variations in contact finish specifications and current ratings.

Key Parameters

Parameter	ICO-318-SGT
Manufacturer	Samtec Inc.
Number of Positions	18 (2 x 9)
Type	DIP, 0.3" (7.62mm) Row Spacing
Pitch - Mating	0.100" (2.54mm)
Pitch - Post	0.100" (2.54mm)
Contact Finish - Mating	Gold
Contact Finish - Post	Tin
Mounting Type	Through Hole
Operating Temperature	-55°C ~ 125°C
Current Rating	1 A
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Position Count & Configuration: All substitutes maintain 18-position (2 x 9) DIP configuration
Row Spacing & Pitch: All substitutes maintain 0.3" row spacing and 0.100" mating/post pitch
Mounting Type: All substitutes use through-hole termination
Operating Temperature: All substitutes operate across -55°C to 125°C
Contact Material: All substitutes use beryllium copper mating contacts and brass/brass alloy posts
Termination Post Length: Primary substitutes use 0.125" length; one variant (111-43-318-41-001000) uses 0.170"

Variations among substitutes include mating contact finish (gold or tin-lead), post contact finish (tin, gold, or tin-lead), current rating (1 A vs. 3 A), and housing material composition. These variations do not affect functional interchangeability for standard DIP socket applications.

Parameter Comparison

Parameter	ICO-318-SGT	110-13-318-41-001000	110-13-318-41-801000	110-41-318-41-001000	110-43-318-41-001000	110-43-318-41-605000	110-44-318-41-001000	110-91-318-41-001000	110-93-318-41-001000	110-99-318-41-001000	111-43-318-41-001000
Manufacturer	Samtec Inc.	Mill-Max	Mill-Max	Mill-Max	Mill-Max	Mill-Max	Mill-Max	Mill-Max	Mill-Max	Mill-Max	Mill-Max
Positions	18 (2 x 9)	18 (2 x 9)	18 (2 x 9)	18 (2 x 9)	18 (2 x 9)	18 (2 x 9)	18 (2 x 9)	18 (2 x 9)	18 (2 x 9)	18 (2 x 9)	18 (2 x 9)
Row Spacing	0.3" (7.62mm)	0.3" (7.62mm)	0.3" (7.62mm)	0.3" (7.62mm)	0.3" (7.62mm)	0.3" (7.62mm)	0.3" (7.62mm)	0.3" (7.62mm)	0.3" (7.62mm)	0.3" (7.62mm)	0.3" (7.62mm)
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Pitch - Post	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)	0.100" (2.54mm)
Contact Finish - Mating	Gold	Gold	Gold	Gold	Gold	Gold	Tin	Gold	Gold	Tin-Lead	Gold
Contact Finish - Post	Tin	Gold	Gold	Tin	Tin	Tin	Tin	Tin-Lead	Tin-Lead	Tin-Lead	Tin
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Current Rating	1 A	3 A	3 A	3 A	3 A	3 A	3 A	3 A	3 A	3 A	3 A
Termination Post Length	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.125" (3.18mm)	0.170" (4.32mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	RoHS non-compliant	RoHS non-compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain functional compatibility with the ICO-318-SGT based on matching DIP socket configuration, pitch specifications, and operating temperature range.

ROHS3 Compliant Substitutes (recommended for new designs and regulated applications):

110-13-318-41-001000: Gold post finish, 3 A rating
110-13-318-41-801000: Gold post finish with decoupling capacitor feature, 3 A rating
110-41-318-41-001000: Tin post finish, 3 A rating
110-43-318-41-001000: Tin post finish, 3 A rating
110-43-318-41-605000: Tin post finish with UL94 V-0 flammability rating, 3 A rating
110-44-318-41-001000: Tin mating finish, tin post finish, 3 A rating
111-43-318-41-001000: Tin post finish, 0.170" post length, UL94 V-0 flammability rating, 3 A rating

RoHS Non-Compliant Substitutes (legacy applications only):

110-91-318-41-001000: Tin-lead post finish, 3 A rating
110-93-318-41-001000: Tin-lead post finish, 3 A rating
110-99-318-41-001000: Tin-lead mating and post finish, 3 A rating

The 111-43-318-41-001000 variant features extended post length (0.170" vs. 0.125") and is suitable only for applications requiring deeper PCB penetration. All other substitutes use standard 0.125" post length matching the original part.

Frequently Asked Questions (FAQ)

Q: Are all listed parts mechanically interchangeable with the ICO-318-SGT?

A: Yes, all listed substitutes share identical DIP socket configuration (18 positions, 0.3" row spacing, 0.100" pitch) and standard termination post length (0.125"), with the exception of 111-43-318-41-001000, which features extended 0.170" posts. Mechanical interchangeability is confirmed for all standard-length variants.

Q: What is the difference between gold and tin contact finishes?

A: Contact finish affects corrosion resistance and solderability. Gold-plated contacts provide superior corrosion resistance and are preferred for long-term storage or high-reliability applications. Tin-plated contacts offer standard solderability and are suitable for standard manufacturing environments. Both finishes are functionally equivalent for electrical performance in standard DIP socket applications.

Q: Why do some substitutes have higher current ratings (3 A vs. 1 A)?

A: Current rating reflects the maximum continuous current the connector can safely carry. Mill-Max substitutes are rated for 3 A, providing higher current capacity than the original ICO-318-SGT (1 A). This represents an improvement and does not affect compatibility; applications requiring only 1 A operation remain fully compatible.

Q: Which substitute should I select for new product designs?

A: For new designs, select from ROHS3 compliant options: 110-13-318-41-001000, 110-41-318-41-001000, 110-43-318-41-001000, 110-43-318-41-605000, 110-44-318-41-001000, or 111-43-318-41-001000. The 110-43-318-41-605000 variant includes UL94 V-0 flammability certification if required by application standards.

Q: What is the significance of the decoupling capacitor feature in 110-13-318-41-801000?

A: The decoupling capacitor feature provides integrated noise filtering on the socket. This variant is suitable for applications requiring on-socket power supply decoupling. Standard variants without this feature are appropriate for applications without this requirement.

Q: Can I use the 111-43-318-41-001000 variant as a direct replacement?

A: The 111-43-318-41-001000 features extended 0.170" termination posts compared to the standard 0.125" length. This variant is suitable only for PCB designs accommodating deeper post penetration. For standard PCB designs, use variants with 0.125" post length.

Q: Are RoHS non-compliant substitutes still available for legacy applications?

A: Yes, 110-91-318-41-001000, 110-93-318-41-001000, and 110-99-318-41-001000 remain available for legacy product support. These parts use tin-lead post finishes and are not recommended for new designs subject to RoHS regulations.

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