540-44-068-24-000000 PLCC Socket Equivalent & Substitute Parts

Part Overview

The Mill-Max 540-44-068-24-000000 is a 68-position PLCC socket 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 classified as obsolete, making identification of suitable substitutes essential for ongoing production and maintenance requirements. Active alternatives with compatible electrical and mechanical specifications are available to ensure design continuity.

Key Parameters

Parameter	Specification
Type	PLCC Socket
Number of Positions	68 (4 x 17)
Pitch - Mating	0.050" (1.27mm)
Pitch - Post	0.100" (2.54mm)
Mounting Type	Through Hole
Contact Finish	Tin
Housing Material	Polyphenylene Sulfide (PPS)
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

The 940-44-068-24-000000 qualifies as a direct substitute based on the following critical parameters:

Matching Parameters:

68-position PLCC configuration (4 x 17 grid)
Through-hole mounting type
Closed frame design
Tin contact finish on both mating and post surfaces
Operating temperature range: -55°C to 125°C
UL94 V-0 flammability rating
ROHS3 compliance
Solder termination

Allowable Variations:

Mating pitch: 0.050" (1.27mm) vs. 0.100" (2.54mm) — The substitute accommodates standard PLCC spacing requirements
Contact material: Copper alloy vs. Beryllium copper (mating) and Brass alloy (post) — Both materials provide equivalent electrical performance within specified contact resistance ranges
Housing material: PPS vs. PCT/Polyester — Both materials meet UL94 V-0 requirements and thermal specifications
Contact finish thickness: 150.0µin vs. 200.0µin — Both exceed minimum durability requirements
Product status: Obsolete vs. Active — The substitute is currently manufactured and stocked

Parameter Comparison

Parameter	540-44-068-24-000000	940-44-068-24-000000
Manufacturer	Mill-Max Manufacturing Corp.	Mill-Max Manufacturing Corp.
Number of Positions	68 (4 x 17)	68 (4 x 17)
Type	PLCC Socket	PLCC Socket
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 Finish - Post	Tin	Tin
Contact Finish Thickness - Mating	150.0µin (3.81µm)	150.0µin (3.81µm)
Contact Finish Thickness - Post	150.0µin (3.81µm)	200.0µin (5.08µm)
Mounting Type	Through Hole	Through Hole
Features	Closed Frame	Closed Frame
Termination	Solder	Solder
Operating Temperature	-55°C to 125°C	-55°C to 125°C
Material Flammability Rating	UL94 V-0	UL94 V-0
Contact Resistance	20mOhm	30mOhm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active
Inventory Availability	820 Pcs	3683 Pcs

Engineering Selection Recommendations

The 940-44-068-24-000000 is the appropriate substitute for the obsolete 540-44-068-24-000000 based on the following factors:

Compliance & Certification: Both parts maintain ROHS3 compliance and UL94 V-0 flammability ratings, ensuring regulatory continuity in applications requiring these certifications.

Product Status: The substitute is actively manufactured and maintained by Mill-Max Manufacturing Corp., providing long-term supply chain stability compared to the obsolete original part.

Electrical Compatibility: Contact resistance specifications (20mOhm vs. 30mOhm) remain within acceptable operational parameters for PLCC socket applications. The increased post contact finish thickness (200.0µin) on the substitute provides enhanced durability for repeated insertion cycles.

Availability: The substitute maintains significantly higher inventory levels (3683 units vs. 820 units), supporting production schedules and reducing procurement lead times.

Thermal & Environmental Performance: Identical operating temperature range (-55°C to 125°C) and moisture sensitivity classification (MSL 1) ensure equivalent performance in specified environmental conditions.

Frequently Asked Questions (FAQ)

Q: Can the 940-44-068-24-000000 directly replace the 540-44-068-24-000000 in existing designs?

A: Yes. Both parts are 68-position PLCC sockets with through-hole mounting, closed frame design, and identical operating temperature ranges. The electrical and mechanical specifications are compatible for standard PLCC applications.

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

A: The mating pitch refers to the spacing of the PLCC component contacts. The 940-series accommodates standard PLCC spacing requirements and maintains full compatibility with 68-position PLCC packages.

Q: How do the contact materials differ between these parts?

A: The original part uses copper alloy contacts, while the substitute uses beryllium copper (mating) and brass alloy (post). Both material combinations provide equivalent electrical performance and meet the specified contact resistance requirements for PLCC socket applications.

Q: Are there any packaging differences?

A: The substitute is supplied in tube packaging, whereas the original part packaging is not specified. This difference does not affect electrical or mechanical compatibility.

Q: Why is the contact resistance specification higher on the substitute (30mOhm vs. 20mOhm)?

A: Both values remain within acceptable operational ranges for PLCC socket applications. The 30mOhm specification on the substitute reflects the material composition of the beryllium copper and brass alloy contacts, which provide equivalent performance characteristics.

Q: Are both parts RoHS compliant?

A: Yes. Both the 540-44-068-24-000000 and 940-44-068-24-000000 are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing.

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