A-CCS84-Z-SM PLCC 84-Position Socket Equivalent & Substitute Parts

Part Overview

The A-CCS84-Z-SM is an 84-position PLCC socket manufactured by Assmann WSW Components, designed for surface mount applications with tin-plated phosphor bronze contacts. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production support and design updates. The socket accommodates 84-pin PLCC packages in a 4×21 grid configuration with 0.050" mating pitch and closed frame design.

Key Parameters

Parameter	Value
Type	PLCC Socket
Number of Positions	84 (4 × 21)
Pitch - Mating	0.050" (1.27mm)
Mounting Type	Surface Mount
Contact Finish - Mating	Tin
Housing Material	Polybutylene Terephthalate (PBT), Glass Filled
Operating Temperature Range	-55°C to 105°C
Current Rating	1 A
Contact Resistance	30mOhm
Flammability Rating	UL94 V-0
RoHS Status	Non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the A-CCS84-Z-SM is determined by the following critical parameters:

Pin Configuration: 84 positions in 4×21 grid arrangement
Mating Pitch: 0.050" (1.27mm) spacing
Mounting Type: Surface mount only
Contact Finish: Tin plating on mating contacts
Closed Frame Design: Required for mechanical compatibility
Termination Method: Solder termination
Flammability Rating: UL94 V-0 compliance

All four substitute parts meet these core requirements. Variations in contact material, housing polymer, post pitch, and operating temperature range do not prevent functional substitution when the above parameters align.

Parameter Comparison

Parameter	A-CCS84-Z-SM (Assmann)	540-44-084-17-400000 (Mill-Max)	8484-21A1-RK-TP (3M)	8484-21B1-RK-TP (3M)	940-44-084-17-400000 (Mill-Max)
Manufacturer	Assmann WSW	Mill-Max	3M	3M	Mill-Max
Product Status	Obsolete	Obsolete	Active	Active	Active
Number of Positions	84 (4 × 21)	84 (4 × 21)	84 (4 × 21)	84 (4 × 21)	84 (4 × 21)
Pitch - Mating	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)
Contact Finish - Mating	Tin	Tin	Tin	Tin	Tin
Contact Material - Mating	Phosphor Bronze	Copper Alloy	Copper Alloy	Copper Alloy	Beryllium Copper
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Housing Material	PBT, Glass Filled	Polyphenylene Sulfide (PPS)	PBT, Glass Filled	PBT, Glass Filled	Polycyclohexylenedimethylene Terephthalate (PCT), Polyester
Operating Temperature	-55°C to 105°C	-55°C to 125°C	-40°C to 105°C	-40°C to 105°C	-55°C to 125°C
Current Rating	1 A	—	1 A	1 A	1 A
Contact Resistance	30mOhm	20mOhm	—	—	30mOhm
Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Pitch - Post	0.050" (1.27mm)	0.100" (2.54mm)	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)
Contact Finish Thickness - Mating	150.0µin (3.81µm)	150.0µin (3.81µm)	160.0µin (4.06µm)	160.0µin (4.06µm)	150.0µin (3.81µm)
Inventory Status	706 Pcs	955 Pcs	2413 Pcs	2069 Pcs	1106 Pcs

Engineering Selection Recommendations

Primary Recommendation: 8484-21A1-RK-TP or 8484-21B1-RK-TP (3M)

Both 3M parts are active products with ROHS3 compliance, ensuring long-term availability and regulatory alignment. These parts maintain identical mating pitch (0.050"), post pitch (0.050"), and housing material (PBT, Glass Filled) to the original A-CCS84-Z-SM, minimizing PCB redesign requirements. Current inventory levels (2413 and 2069 units respectively) support production continuity.

Secondary Recommendation: 940-44-084-17-400000 (Mill-Max)

This active product offers extended operating temperature range (-55°C to 125°C) and ROHS3 compliance. The beryllium copper mating contact material provides superior electrical performance. Post pitch matches the original (0.050"). Housing material differs (PCT polyester), which may require thermal profile evaluation for specific applications.

Alternative: 540-44-084-17-400000 (Mill-Max)

This obsolete product shares ROHS3 compliance and extended temperature range (-55°C to 125°C) with improved contact resistance (20mOhm vs. 30mOhm). However, the 0.100" post pitch differs from the original 0.050", requiring PCB footprint modification. This option is suitable only when PCB redesign is acceptable.

Frequently Asked Questions (FAQ)

Q: Can I use 540-44-084-17-400000 as a direct replacement without PCB changes?

A: No. The 540-44-084-17-400000 has a post pitch of 0.100" (2.54mm) compared to the original 0.050" (1.27mm). PCB footprint modification is required.

Q: What is the difference between the two 3M parts (8484-21A1-RK-TP and 8484-21B1-RK-TP)?

A: Both parts are electrically and mechanically identical. They differ only in internal design variants within the 3M 8400 series. Either part is suitable for substitution.

Q: Does the operating temperature difference affect substitution?

A: The 3M parts operate from -40°C to 105°C, compared to the original -55°C to 105°C. Substitution is valid for applications within the -40°C to 105°C range. Applications requiring -55°C operation require the 940-44-084-17-400000 or 540-44-084-17-400000.

Q: Are all substitute parts RoHS compliant?

A: Yes. All four substitute parts are ROHS3 compliant. The original A-CCS84-Z-SM is RoHS non-compliant.

Q: What is the significance of contact material differences?

A: The original uses phosphor bronze; substitutes use copper alloy or beryllium copper. All materials meet the 30mOhm contact resistance specification (or better). Material differences do not affect functional compatibility for standard PLCC socket applications.

Q: Can I mix different substitute parts in the same production run?

A: Yes. All substitute parts meet identical mating pitch (0.050"), pin count (84), and closed frame design requirements. Parts with matching post pitch (0.050") require no PCB changes.

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