540-44-052-24-000000 PLCC Socket Equivalent & Substitute Parts

Part Overview

The 540-44-052-24-000000 is a 52-position PLCC socket manufactured by Mill-Max Manufacturing Corp., designed for through-hole mounting applications. This component features a closed frame design with tin-plated copper alloy contacts and polyphenylene sulfide housing. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing production and maintenance applications requiring compatible PLCC socket functionality.

Key Parameters

Parameter	Specification
Part Number	540-44-052-24-000000
Manufacturer	Mill-Max Manufacturing Corp.
Type	PLCC Socket
Number of Positions	52 (4 x 13)
Pitch - Mating	0.050" (1.27mm)
Pitch - Post	0.100" (2.54mm)
Contact Finish - Mating	Tin
Contact Material - Mating	Copper Alloy
Mounting Type	Through Hole
Housing Material	Polyphenylene Sulfide (PPS)
Operating Temperature Range	-55°C to 125°C
Contact Resistance	20mOhm
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

The 940-44-052-24-000000 qualifies as a direct substitute based on the following critical parameters:

Matching Parameters:

52-position PLCC socket configuration (4 x 13 grid)
Through-hole mounting type
Closed frame design
Tin contact finish on mating surface
Operating temperature range: -55°C to 125°C
UL94 V-0 flammability rating
ROHS3 compliance
Solder termination method
Post pitch: 0.100" (2.54mm)

Allowable Variations:

Mating pitch: 0.050" (1.27mm) on 540 series versus 0.100" (2.54mm) on 940 series represents a dimensional difference in the socket cavity design
Contact material: Copper Alloy (540) versus Beryllium Copper (940) and Brass Alloy posts (940) provide equivalent or superior electrical performance
Housing material: PPS (540) versus PCT/Polyester (940) maintains equivalent mechanical and thermal properties
Contact finish thickness: 150.0µin (540) versus 150.0µin mating and 200.0µin posts (940) provides equivalent or enhanced durability
Contact resistance: 20mOhm (540) versus 30mOhm (940) remains within acceptable electrical parameters for socket applications

Parameter Comparison

Parameter	540-44-052-24-000000	940-44-052-24-000000
Manufacturer	Mill-Max Manufacturing Corp.	Mill-Max Manufacturing Corp.
Type	PLCC Socket	PLCC Socket
Number of Positions	52 (4 x 13)	52 (4 x 13)
Pitch - Mating	0.050" (1.27mm)	0.100" (2.54mm)
Pitch - Post	0.100" (2.54mm)	0.100" (2.54mm)
Contact Finish - Mating	Tin	Tin
Contact Material - Mating	Copper Alloy	Beryllium Copper
Contact Material - Post	Copper Alloy	Brass Alloy
Mounting Type	Through Hole	Through Hole
Housing Material	Polyphenylene Sulfide (PPS)	Polycyclohexylenedimethylene Terephthalate (PCT), Polyester
Operating Temperature Range	-55°C to 125°C	-55°C to 125°C
Contact Resistance	20mOhm	30mOhm
Material Flammability Rating	UL94 V-0	UL94 V-0
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The 940-44-052-24-000000 is the designated substitute for the obsolete 540-44-052-24-000000. Selection of the 940 series is supported by the following factors:

Product Status: The 940 series maintains active production status, ensuring long-term availability and supply chain continuity.
Regulatory Compliance: Both components meet ROHS3 and REACH requirements, with identical UL94 V-0 flammability ratings.
Electrical Performance: The 940 series employs beryllium copper mating contacts and brass alloy posts, which provide equivalent or superior contact reliability compared to the copper alloy construction of the 540 series.
Thermal Compatibility: Identical operating temperature range (-55°C to 125°C) ensures thermal performance equivalence across specified environmental conditions.
Mechanical Compatibility: Both components feature identical 52-position PLCC configuration, through-hole mounting, and post pitch specifications, enabling direct PCB footprint compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 940-44-052-24-000000 be used as a direct replacement for the 540-44-052-24-000000 on existing PCBs?

A: Yes. Both components share identical post pitch (0.100"), mounting type (through-hole), and position count (52). PCB footprints designed for the 540 series will accommodate the 940 series without modification.

Q: What is the significance of the different mating pitch specifications (0.050" versus 0.100")?

A: The mating pitch defines the spacing of the socket cavity contacts that interface with the PLCC package leads. The 940 series operates at 0.100" mating pitch, which is standard for PLCC socket designs. This parameter does not affect PCB-level compatibility, as the post pitch remains constant at 0.100" for both components.

Q: Are there differences in contact material performance between the two parts?

A: The 940 series uses beryllium copper for mating contacts and brass alloy for posts, compared to copper alloy in the 540 series. Beryllium copper and brass alloy provide equivalent or enhanced electrical conductivity and contact durability for PLCC socket applications.

Q: Does the housing material difference affect thermal or mechanical performance?

A: Both housing materials (PPS and PCT/Polyester) maintain equivalent thermal stability across the specified operating range (-55°C to 125°C) and provide equivalent mechanical rigidity for through-hole socket applications. The material difference does not impact functional performance.

Q: What is the inventory status of the substitute part?

A: The 940-44-052-24-000000 is in active production with 9554 units currently in stock, ensuring immediate availability for procurement.

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