PLCC-028-T-N 28-Position PLCC Socket Equivalent & Substitute Parts

Part Overview

The PLCC-028-T-N is a 28-position PLCC socket manufactured by Samtec Inc., designed for surface mount applications requiring closed frame construction with tin-plated contacts. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The socket accommodates 28 pins in a 4 x 7 grid configuration with 0.050" (1.27mm) mating pitch and 0.100" (2.54mm) post pitch.

Substiute Parts

PLCC-028-T-N

Samtec Inc.In Stock: 1185PLCC-028-T-N Datasheet

Current PartRFQ

540-44-028-17-400004

Mill-Max Manufacturing Corp.In Stock: 1074540-44-028-17-400004 Datasheet

SimilarRFQ

8428-21B1-RK-TP

3MIn Stock: 11358428-21B1-RK-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PLCC-028-T-N is determined by the following critical parameters:

• 28-position pin count in 4 x 7 grid configuration
• 0.050" (1.27mm) mating pitch for IC contact alignment
• Surface mount termination with solder connection
• Closed frame construction
• Tin contact finish on mating surfaces
• UL94 V-0 flammability rating
• ROHS3 compliance and MSL 1 rating

The identified substitute parts meet these core electrical and mechanical requirements, enabling direct functional replacement in applications originally designed for the PLCC-028-T-N.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are classified as active products, providing supply continuity advantages over the obsolete PLCC-028-T-N. Selection between the two substitutes should be based on packaging requirements and operational temperature constraints:

The 540-44-028-17-400004 (Mill-Max) is supplied in Tape & Reel packaging, suitable for automated assembly processes. Operating temperature range is not specified in available data.

The 8428-21B1-RK-TP (3M) is supplied in Tube packaging and operates within -40°C ~ 105°C, which is narrower than the original part's -55°C ~ 125°C range. This substitute is appropriate for applications within its specified temperature envelope.

Both parts maintain ROHS3 compliance, UL94 V-0 flammability rating, and MSL 1 moisture sensitivity classification, ensuring compatibility with modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can the 540-44-028-17-400004 directly replace the PLCC-028-T-N?

A: Yes. Both parts share identical pin count (28), mating pitch (0.050"), contact finish (tin), mounting type (surface mount), and closed frame construction. The primary difference is packaging format (Tape & Reel vs. unspecified) and housing material (PPS vs. LCP).

Q: What is the difference between the post pitch specifications?

A: The PLCC-028-T-N specifies 0.100" (2.54mm) post pitch, while both substitutes specify 0.050" (1.27mm) post pitch. This difference reflects the contact grid spacing on the PCB footprint and must be verified against your specific board design.

Q: Is the 8428-21B1-RK-TP suitable for high-temperature applications?

A: The 8428-21B1-RK-TP operates within -40°C ~ 105°C. Applications requiring the original part's -55°C ~ 125°C range should confirm compatibility with this narrower temperature specification.

Q: Are all three parts RoHS compliant?

A: Yes. The PLCC-028-T-N, 540-44-028-17-400004, and 8428-21B1-RK-TP are all ROHS3 compliant with MSL 1 rating, meeting current environmental and moisture sensitivity standards.

Q: What packaging options are available for these substitutes?

A: The 540-44-028-17-400004 is supplied in Tape & Reel format for automated pick-and-place assembly. The 8428-21B1-RK-TP is supplied in Tube packaging. Packaging selection should align with your assembly process requirements.