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

Part Overview

The A-CCS84-Z-SM-R 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 and substitute parts necessary for ongoing production support and design flexibility. The socket accommodates 84 pins in a 4 x 21 grid configuration with 0.050" (1.27mm) pitch and operates across a temperature range of -55°C to 105°C.

Key Parameters

Parameter	Value
Type	PLCC Socket
Number of Positions	84 (4 x 21)
Pitch - Mating	0.050" (1.27mm)
Mounting Type	Surface Mount
Contact Finish - Mating	Tin
Contact Material - Mating	Phosphor Bronze
Housing Material	Polybutylene Terephthalate (PBT), Glass Filled
Operating Temperature	-55°C ~ 105°C
Current Rating	1 A
Contact Resistance	30mOhm
Material Flammability Rating	UL94 V-0
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

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

84-position PLCC configuration (4 x 21 grid)
0.050" (1.27mm) mating pitch
Surface mount termination
Tin contact finish on mating surface
Closed frame design
Solder termination method
UL94 V-0 flammability rating
MSL 1 (Unlimited) moisture sensitivity

All identified substitute parts maintain these core electrical and mechanical specifications. Variations in contact material composition, housing polymer type, post pitch, and operating temperature ranges are permitted within the substitution matrix, as these do not affect the primary mating interface or functional compatibility with standard PLCC 84-pin packages.

Parameter Comparison

Parameter	A-CCS84-Z-SM-R (Main)	A-CCS 084-Z-SM	540-44-084-17-400000	8484-21A1-RK-TP	8484-21B1-RK-TP	940-44-084-17-400000
Manufacturer	Assmann WSW	Assmann WSW	Mill-Max	3M	3M	Mill-Max
Product Status	Obsolete	Active	Obsolete	Active	Active	Active
Type	PLCC	PLCC	PLCC	PLCC	PLCC	PLCC
Positions	84 (4 x 21)	84 (4 x 21)	84 (4 x 21)	84 (4 x 21)	84 (4 x 21)	84 (4 x 21)
Pitch - Mating	0.050" (1.27mm)	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	Tin
Contact Material - Mating	Phosphor Bronze	Phosphor Bronze	Copper Alloy	Copper Alloy	Copper Alloy	Beryllium Copper
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Features	Closed Frame	Closed Frame	Closed Frame	Closed Frame	Closed Frame	Closed Frame
Termination	Solder	Solder	Solder	Solder	Solder	Solder
Pitch - Post	0.050" (1.27mm)	0.050" (1.27mm)	0.100" (2.54mm)	0.050" (1.27mm)	0.050" (1.27mm)	0.050" (1.27mm)
Contact Finish - Post	Tin	Tin	Tin	Tin	Tin	Tin
Housing Material	PBT, Glass Filled	PA9T, Nylon 9T, Glass Filled	PPS	PBT, Glass Filled	PBT, Glass Filled	PCT, Polyester
Operating Temperature	-55°C ~ 105°C	-40°C ~ 105°C	-55°C ~ 125°C	-40°C ~ 105°C	-40°C ~ 105°C	-55°C ~ 125°C
Current Rating	1 A	1 A	1 A	1 A	1 A	1 A
Contact Resistance	30mOhm	15mOhm	20mOhm	—	—	30mOhm
Material Flammability Rating	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: A-CCS 084-Z-SM

The A-CCS 084-Z-SM from Assmann WSW Components is the direct functional equivalent with active product status. This part maintains identical mating pitch, pin count, and surface mount configuration. The housing material differs (PA9T versus PBT), but both are glass-filled thermoplastics with UL94 V-0 ratings. The operating temperature range is -40°C to 105°C, which covers the primary operating window of the original part. Contact resistance is improved at 15mOhm. This part is recommended for new designs and ongoing production requiring an active, supported component.

Secondary Recommendations: 8484-21A1-RK-TP and 8484-21B1-RK-TP

Both 3M parts from the 8400 series are active products with identical mating pitch, pin count, and post pitch specifications. These parts feature copper alloy contacts with tin finish and PBT glass-filled housing. Operating temperature range is -40°C to 105°C. Both parts offer high inventory availability (2413 and 2069 units respectively) and ROHS3 compliance. These are suitable for applications where 3M component qualification is required.

Tertiary Recommendation: 940-44-084-17-400000

The Mill-Max 940 series part is an active product with extended operating temperature range (-55°C to 125°C), matching the original part's lower temperature limit. This part features beryllium copper mating contacts and brass alloy posts, providing enhanced contact performance. Post pitch is 0.050" (1.27mm), matching the original specification. This part is suitable for applications requiring extended temperature performance or beryllium copper contact properties.

Alternative: 540-44-084-17-400000

The Mill-Max 540 series part is classified as obsolete and should be considered only when existing inventory must be consumed or when specific PPS housing material is required. The post pitch differs at 0.100" (2.54mm), which may affect PCB layout compatibility. This part is not recommended for new designs.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts interchangeably with the A-CCS84-Z-SM-R?

A: All listed substitute parts maintain the critical mating interface specifications: 84-position PLCC configuration, 0.050" (1.27mm) mating pitch, tin contact finish, and surface mount termination. They are electrically and mechanically compatible with standard PLCC 84-pin packages. However, post pitch and housing material differences may affect PCB layout and thermal characteristics. Verify post pitch compatibility with your PCB design before selection.

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

A: Both parts are functionally identical in all provided specifications. The designation difference (21A1 versus 21B1) reflects internal 3M product line variations. Both offer the same electrical performance, contact resistance characteristics, and operating temperature range. Selection between these parts can be based on inventory availability or existing supplier relationships.

Q: Why does the 540-44-084-17-400000 have a different post pitch?

A: The 540 series part features 0.100" (2.54mm) post pitch compared to the standard 0.050" (1.27mm) specification. This difference affects PCB footprint and solder pad spacing. This part is suitable only for designs with compatible PCB layouts. Verify footprint compatibility before use.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed carry ROHS3 compliance certification. The original A-CCS84-Z-SM-R does not specify RoHS status in the provided data. If RoHS compliance is a requirement, the substitute parts provide documented compliance.

Q: What is the operating temperature consideration when selecting a substitute?

A: The original part operates from -55°C to 105°C. The Assmann A-CCS 084-Z-SM and 3M parts operate from -40°C to 105°C, which covers most standard industrial applications. The Mill-Max 940 and 540 series parts extend to -55°C to 125°C, providing additional margin for extreme temperature environments. Select based on your application's actual temperature requirements.

Q: How do contact material differences affect performance?

A: The original part uses phosphor bronze contacts. Substitute parts employ phosphor bronze, copper alloy, or beryllium copper. All materials are suitable for PLCC socket applications. Beryllium copper (940 series) offers enhanced contact performance and lower resistance characteristics. Copper alloy (3M and Mill-Max 540) provides standard performance. Material selection should align with your contact force and reliability requirements.

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