ICO-406-S8A-T Equivalent & Substitute Parts

Part Overview

The ICO-406-S8A-T is a 40-position DIP socket manufactured by 3M, designed for through-hole mounting of dual inline package integrated circuits. This component features a 0.6" row spacing with tin-plated phosphor bronze contacts and polyester glass-filled housing rated UL94 V-0. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Key Parameters

Parameter	Value
Number of Positions	40 (2 x 20)
Row Spacing	0.6" (15.24mm)
Pitch - Mating	0.100" (2.54mm)
Pitch - Post	0.100" (2.54mm)
Contact Finish - Mating	Tin
Contact Finish - Post	Tin
Contact Material	Phosphor Bronze
Mounting Type	Through Hole
Housing Material	Polyester, Glass Filled
Flammability Rating	UL94 V-0
Current Rating	1 A
Operating Temperature	-65°C ~ 105°C
Termination	Solder
Features	Open Frame

Substitute Part Grouping Explanation

Substitution eligibility for the ICO-406-S8A-T is determined by strict alignment of the following critical parameters:

Position Count & Configuration: 40 positions in 2 x 20 arrangement
Row Spacing: 0.6" (15.24mm) center-to-center
Mating Pitch: 0.100" (2.54mm)
Post Pitch: 0.100" (2.54mm)
Contact Material & Finish: Phosphor bronze with tin plating on both mating and post surfaces
Mounting Technology: Through-hole solder termination
Housing Construction: Polyester with glass reinforcement, UL94 V-0 rated
Current Capacity: 1 A minimum

The substitute part 4840-6004-CP meets all critical electrical and mechanical parameters required for direct functional equivalence. Both parts share identical socket geometry, contact specifications, and mounting characteristics, enabling pin-for-pin compatibility in DIP socket applications.

Parameter Comparison

Parameter	ICO-406-S8A-T	4840-6004-CP	Match Status
Manufacturer	3M	3M	Identical
Number of Positions	40 (2 x 20)	40 (2 x 20)	Identical
Row Spacing	0.6" (15.24mm)	0.6" (15.24mm)	Identical
Pitch - Mating	0.100" (2.54mm)	0.100" (2.54mm)	Identical
Pitch - Post	0.100" (2.54mm)	0.100" (2.54mm)	Identical
Contact Finish - Mating	Tin	Tin	Identical
Contact Finish - Post	Tin	Tin	Identical
Contact Material	Phosphor Bronze	Phosphor Bronze	Identical
Mounting Type	Through Hole	Through Hole	Identical
Housing Material	Polyester, Glass Filled	Polyester, Glass Filled	Identical
Flammability Rating	UL94 V-0	UL94 V-0	Identical
Current Rating	1 A	1 A	Identical
Operating Temperature	-65°C ~ 105°C	-25°C ~ 85°C	Substitute range narrower
Product Status	Obsolete	Active	Substitute actively produced
RoHS Status	Non-compliant	ROHS3 Compliant	Substitute meets current standards

Engineering Selection Recommendations

The 4840-6004-CP serves as a direct functional equivalent to the obsolete ICO-406-S8A-T. Both components are manufactured by 3M and share identical electrical and mechanical specifications across all critical parameters including position count, pitch, contact materials, and current rating.

Product Status Consideration: The ICO-406-S8A-T is obsolete with limited inventory availability (744 pcs). The 4840-6004-CP is actively produced with substantially higher inventory (4188 pcs), ensuring long-term supply chain continuity.

Compliance Status: The 4840-6004-CP achieves ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements. The original ICO-406-S8A-T does not meet these standards.

Operating Temperature Range: The substitute part operates within -25°C to 85°C, which is narrower than the original part's -65°C to 105°C range. Applications requiring operation below -25°C or above 85°C must retain the original ICO-406-S8A-T or identify alternative solutions.

Packaging: The 4840-6004-CP is supplied in tube packaging, whereas the original part packaging is unspecified. Verify packaging requirements for automated assembly processes if applicable.

Frequently Asked Questions (FAQ)

Q: Can the 4840-6004-CP be used as a direct replacement for the ICO-406-S8A-T in existing designs?

A: Yes, for applications operating within the -25°C to 85°C temperature range. The 4840-6004-CP matches all critical electrical and mechanical parameters including position count, pitch, contact materials, and current rating. If your application requires operation outside this temperature window, the original part must be retained.

Q: What is the primary difference between these two parts?

A: The ICO-406-S8A-T is obsolete with a wider operating temperature range (-65°C to 105°C), while the 4840-6004-CP is actively produced with a narrower operating range (-25°C to 85°C) and meets current RoHS3 compliance standards.

Q: Are the contact specifications identical?

A: Yes. Both parts feature phosphor bronze contacts with tin plating on mating and post surfaces. Contact finish thickness specifications are provided for the 4840-6004-CP (35.4µin mating, 35.0µin post) but not for the original part.

Q: Does packaging differ between these parts?

A: The 4840-6004-CP is supplied in tube packaging. The original ICO-406-S8A-T packaging type is not specified in available documentation. Confirm packaging compatibility with your assembly process requirements.

Q: What is the inventory status for each part?

A: The ICO-406-S8A-T has 744 pcs available as new original stock. The 4840-6004-CP has 4188 pcs available, providing significantly greater supply availability for ongoing procurement needs.

Q: Are both parts suitable for high-reliability applications?

A: Both parts carry UL94 V-0 flammability ratings and are rated for 1 A current. The 4840-6004-CP additionally meets ROHS3 compliance and REACH unaffected status, making it suitable for applications with current regulatory requirements.

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