940-99-084-24-000000 PLCC Socket Equivalent & Substitute Parts

Part Overview

The 940-99-084-24-000000 is an 84-position PLCC socket manufactured by Mill-Max Manufacturing Corp., designed for through-hole mounting applications. This component features tin-lead contact finish on mating surfaces and is housed in a closed-frame polycyclohexylenedimethylene terephthalate (PCT) polyester body. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Substiute Parts

940-99-084-24-000000

Mill-Max Manufacturing Corp.In Stock: 996940-99-084-24-000000 Datasheet

Current PartRFQ

940-44-084-24-000000

Mill-Max Manufacturing Corp.In Stock: 1346940-44-084-24-000000 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for PLCC sockets is determined by the following critical parameters:

• Position Count & Grid Configuration: 84 positions in 4 x 21 arrangement
• Pitch Specifications: 0.100" (2.54mm) mating and post pitch
• Contact Material: Beryllium copper mating contacts and brass alloy posts
• Mounting Configuration: Through-hole solder termination
• Housing Material: PCT polyester construction
• Electrical Performance: 1 A current rating and 30mOhm contact resistance
• Environmental Compliance: Operating temperature -55°C to 125°C, UL94 V-0 flammability rating

The substitute part 940-44-084-24-000000 maintains all critical mechanical and electrical parameters. The primary difference is the contact finish specification on mating surfaces, which transitions from tin-lead to tin, and corresponding adjustment in mating contact finish thickness. This substitution is valid because the core socket architecture, position count, pitch, contact materials, and electrical ratings remain identical.

Parameter Comparison

Engineering Selection Recommendations

The 940-44-084-24-000000 serves as the active production equivalent for the obsolete 940-99-084-24-000000. Both parts maintain identical electrical performance specifications, including 1 A current rating and 30mOhm contact resistance. The substitute part is ROHS3 compliant and carries an active product status, ensuring continued availability and manufacturing support.

The transition from tin-lead to tin contact finish on the mating surfaces represents a material specification change rather than a functional limitation. Both finishes provide equivalent electrical conductivity and contact reliability within the specified operating temperature range of -55°C to 125°C. The increased mating contact finish thickness (150.0µin versus 100.0µin) on the substitute part provides enhanced durability characteristics.

Both parts maintain identical mechanical compatibility: 84-position PLCC configuration, 0.100" pitch, through-hole solder termination, and closed-frame PCT polyester housing. The substitute part is suitable for direct replacement in applications currently utilizing the 940-99-084-24-000000.

Frequently Asked Questions (FAQ)

Q: Can the 940-44-084-24-000000 directly replace the 940-99-084-24-000000 in existing designs?

A: Yes. Both parts share identical position count (84), pitch specifications (0.100"), contact materials (beryllium copper mating, brass alloy posts), mounting type (through-hole), and electrical ratings (1 A, 30mOhm). The contact finish change from tin-lead to tin does not affect electrical or mechanical compatibility.

Q: What is the significance of the contact finish change from tin-lead to tin?

A: The contact finish is a surface coating applied to the beryllium copper mating contacts. Tin provides equivalent electrical conductivity and corrosion resistance compared to tin-lead. The increased thickness specification (150.0µin versus 100.0µin) on the substitute part enhances contact durability.

Q: Why is the 940-99-084-24-000000 classified as obsolete?

A: The 940-99-084-24-000000 has been superseded by the 940-44-084-24-000000 in Mill-Max's active product line. The substitute part maintains all critical specifications while offering improved availability and manufacturing support.

Q: Are there packaging differences between these parts?

A: The 940-99-084-24-000000 packaging specification is not provided. The 940-44-084-24-000000 is supplied in tube packaging. Confirm packaging requirements for your application.

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are ROHS3 compliant, carry UL94 V-0 flammability rating, maintain MSL 1 (unlimited moisture sensitivity level), and are REACH unaffected. Electrical and environmental specifications are identical.

Q: What is the operating temperature range for these PLCC sockets?

A: Both parts operate across -55°C to 125°C, suitable for industrial and commercial applications requiring extended temperature performance.