Mill-Max 540-99-028-24-000000 PLCC Socket 28-Position Equivalent & Substitute Parts

Part Overview

The Mill-Max Manufacturing Corp. 540-99-028-24-000000 is a 28-position PLCC socket designed for through-hole mounting applications. This component features a closed frame design with tin-lead contact finish and polyphenylene sulfide housing. The part is classified as obsolete, making identification of compatible substitute components essential for ongoing production and maintenance requirements. Equivalent parts must maintain electrical and mechanical compatibility across mating pitch, contact configuration, and termination specifications.

Substiute Parts

540-99-028-24-000000

Mill-Max Manufacturing Corp.In Stock: 774540-99-028-24-000000 Datasheet

Current PartRFQ

8428-11B1-RK-TP

3MIn Stock: 22388428-11B1-RK-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Mill-Max 540-99-028-24-000000 is determined by the following critical parameters:

• Socket Type: PLCC configuration with 28-position (4 x 7) arrangement
• Mating Pitch: 0.050" (1.27mm) spacing for IC contact alignment
• Post Pitch: 0.100" (2.54mm) for PCB through-hole mounting
• Mounting Configuration: Through-hole solder termination
• Frame Design: Closed frame structure
• Compliance: ROHS3 compliance and UL94 V-0 flammability rating

The 3M 8428-11B1-RK-TP qualifies as a manufacturer-recommended substitute based on matching socket type, position count, mating pitch, post pitch, mounting method, frame design, and compliance certifications. Both components accommodate identical IC packages and PCB footprints.

Parameter Comparison

Engineering Selection Recommendations

The 3M 8428-11B1-RK-TP serves as the manufacturer-recommended substitute for the obsolete Mill-Max 540-99-028-24-000000. Both components maintain identical electrical and mechanical interfaces, ensuring direct PCB compatibility without layout modifications.

Key selection factors:

• Product Status: The 3M part is active production status, providing supply continuity for the obsolete Mill-Max component
• Compliance Alignment: Both parts maintain ROHS3 compliance and UL94 V-0 flammability certification
• Moisture Sensitivity: Both components carry MSL 1 rating, indicating unlimited shelf life under standard storage conditions
• Contact Finish Variation: The 3M substitute uses tin finish (160.0µin) versus tin-lead finish (200.0µin) on the original part. Both finishes are compatible with standard solder reflow processes
• Housing Material Difference: The 3M part uses glass-filled PBT versus PPS in the original design. Both materials meet the same flammability and mechanical requirements for this socket application

Frequently Asked Questions (FAQ)

Q: Can the 3M 8428-11B1-RK-TP directly replace the Mill-Max 540-99-028-24-000000 on existing PCBs?

A: Yes. Both components share identical mating pitch (0.050"), post pitch (0.100"), position count (28), and through-hole footprint. No PCB redesign is required.

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

A: The original Mill-Max part uses tin-lead finish at 200.0µin thickness, while the 3M substitute uses tin finish at 160.0µin thickness. Both finishes are compatible with standard solder reflow and wave soldering processes. The tin finish in the 3M part meets RoHS requirements without lead content.

Q: Are there housing material compatibility concerns?

A: The Mill-Max part uses polyphenylene sulfide (PPS) housing, while the 3M substitute uses glass-filled polybutylene terephthalate (PBT). Both materials meet UL94 V-0 flammability requirements and provide equivalent mechanical performance for socket applications.

Q: What is the operating temperature range for the substitute part?

A: The 3M 8428-11B1-RK-TP operates from -40°C to 105°C, covering standard industrial and commercial temperature ranges.

Q: Is the 3M part available in production quantities?

A: The 3M 8428-11B1-RK-TP is active production status with established supply channels, providing reliable availability for new designs and production requirements.

Q: Do both parts have the same moisture sensitivity level?

A: Yes. Both the Mill-Max 540-99-028-24-000000 and 3M 8428-11B1-RK-TP carry MSL 1 (Unlimited) rating, indicating no moisture-related storage restrictions.