PX-28LCC PLCC Socket 28-Position Equivalent & Substitute Parts

Part Overview

The PX-28LCC is a 28-position PLCC (Plastic Leaded Chip Carrier) socket manufactured by Kycon, Inc., designed for through-hole mounting applications. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production support, maintenance, and design updates. The socket accommodates 28-pin PLCC packages with a 0.050" (1.27mm) mating pitch and tin-plated phosphor bronze contacts rated for -40°C to 75°C operation.

Substiute Parts

PX-28LCC

Kycon, Inc.In Stock: 861PX-28LCC Datasheet

Current PartRFQ

8428-11B1-RK-TP

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

SimilarRFQ

A-CCS 028-Z-T

Assmann WSW ComponentsIn Stock: 1703A-CCS 028-Z-T Datasheet

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PLCC-28-AT

Adam TechIn Stock: 2374PLCC-28-AT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PX-28LCC is determined by strict equivalence across the following critical parameters:

• Pin Configuration: 28 positions in 4 x 7 grid arrangement
• Mating Pitch: 0.050" (1.27mm) spacing
• Post Pitch: 0.100" (2.54mm) spacing
• Contact Finish: Tin plating on mating contacts
• Mounting Method: Through-hole solder termination
• Housing Material: Polybutylene Terephthalate (PBT), glass-filled
• Frame Design: Closed frame construction
• Termination Post Length: 0.132" (3.35mm)
• Flammability Rating: UL94 V-0
• Moisture Sensitivity: MSL 1 (Unlimited)

All three substitute parts meet these core requirements. Variations in contact material composition (phosphor bronze vs. copper alloy), contact finish thickness, operating temperature range, and contact resistance are secondary parameters that do not prevent functional substitution within the specified electrical and mechanical constraints.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are functionally equivalent to the PX-28LCC based on critical electrical and mechanical parameters. Selection among these alternatives should be based on the following factors:

8428-11B1-RK-TP (3M): Active product status with extended operating temperature range (-40°C to 105°C). ROHS3 compliant. Copper alloy contact material provides alternative to phosphor bronze. Current rating of 1A specified. Suitable for applications requiring higher temperature operation than the original PX-28LCC.

A-CCS 028-Z-T (Assmann WSW Components): Active product status with extended operating temperature range (-40°C to 105°C). ROHS3 compliant. Phosphor bronze contact material matches original specification. Contact resistance of 15mOhm matches PX-28LCC. Suitable for direct replacement in temperature-constrained applications.

PLCC-28-AT (Adam Tech): Active product status with widest operating temperature range (-55°C to 105°C). ROHS3 compliant. Phosphor bronze contact material matches original specification. Termination post length of 0.126" (3.20mm) is 0.006" shorter than PX-28LCC; verify PCB pad depth compatibility. Contact resistance of 30mOhm is higher than original specification.

All parts carry UL94 V-0 flammability rating and MSL 1 moisture sensitivity level, matching the original component's environmental compliance profile.

Frequently Asked Questions (FAQ)

Q: Can the 8428-11B1-RK-TP substitute for the PX-28LCC in all applications?

A: The 8428-11B1-RK-TP meets all critical mechanical and electrical parameters for PLCC socket substitution. The copper alloy contact material differs from the original phosphor bronze, but both materials are acceptable for tin-plated contact applications. The extended operating temperature range (-40°C to 105°C) exceeds the original specification (-40°C to 75°C), providing additional thermal margin.

Q: What is the significance of the termination post length difference in the PLCC-28-AT?

A: The PLCC-28-AT has a termination post length of 0.126" (3.20mm) compared to 0.132" (3.35mm) for the PX-28LCC. This 0.006" difference must be evaluated against PCB pad depth and solder fillet requirements. Verify that the shorter post length does not compromise solder joint integrity or mechanical stability on your specific PCB design.

Q: Are all substitute parts RoHS compliant?

A: Yes. The PX-28LCC is RoHS Compliant. All three substitute parts are ROHS3 Compliant, which represents an updated compliance standard. All parts meet RoHS requirements for hazardous substance restrictions.

Q: What is the difference between phosphor bronze and copper alloy contacts?

A: Both materials are suitable for tin-plated contact applications. Phosphor bronze (used in PX-28LCC, A-CCS 028-Z-T, and PLCC-28-AT) provides consistent spring characteristics and contact resistance. Copper alloy (used in 8428-11B1-RK-TP) offers alternative material properties. Selection depends on your specific contact force and electrical performance requirements.

Q: Can I use the PLCC-28-AT if my application requires contact resistance of 15mOhm or lower?

A: The PLCC-28-AT specifies 30mOhm contact resistance, which is double the PX-28LCC specification of 15mOhm. If your circuit design requires contact resistance of 15mOhm or lower, select either the A-CCS 028-Z-T (15mOhm) or verify that the 30mOhm specification is acceptable for your application's voltage and current requirements.

Q: What packaging formats are available for these substitute parts?

A: All three substitute parts are supplied in Tube packaging, consistent with standard PLCC socket distribution methods. Verify tube quantity requirements for your procurement process.