A-CCS20-Z-SM-R PLCC 20-Position Socket Equivalent & Substitute Parts

Part Overview

The A-CCS20-Z-SM-R is a 20-position PLCC socket manufactured by Assmann WSW Components, designed for surface mount applications with tin-plated phosphor bronze contacts. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The socket accommodates 4 x 5 position PLCC packages with 0.050" (1.27mm) mating pitch and operates across -55°C to 105°C temperature range.

Key Parameters

Parameter	A-CCS20-Z-SM-R
Type	PLCC
Number of Positions	20 (4 x 5)
Pitch - Mating	0.050" (1.27mm)
Contact Finish - Mating	Tin
Contact Material - Mating	Phosphor Bronze
Mounting Type	Surface Mount
Features	Closed Frame
Termination	Solder
Operating Temperature	-55°C ~ 105°C
Current Rating	1 A
Contact Resistance	30mOhm
Material Flammability Rating	UL94 V-0
Moisture Sensitivity Level	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the A-CCS20-Z-SM-R is determined by strict equivalence across the following critical parameters:

Type: PLCC socket
Number of Positions: 20 (4 x 5) configuration
Pitch - Mating: 0.050" (1.27mm)
Contact Finish - Mating: Tin
Mounting Type: Surface Mount
Features: Closed Frame
Termination: Solder
Material Flammability Rating: UL94 V-0
Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts listed meet these core electrical and mechanical requirements. Variations in contact material, housing material, operating temperature range, and post pitch do not prevent functional substitution when the mating interface parameters remain constant.

Parameter Comparison

Parameter	A-CCS20-Z-SM-R	A-CCS 020-Z-SM	540-44-020-17-400000	8420-21A1-RK-TP	8420-21B1-RK-TP	940-44-020-17-400000
Manufacturer	Assmann WSW	Assmann WSW	Mill-Max	3M	3M	Mill-Max
Type	PLCC	PLCC	PLCC	PLCC	PLCC	PLCC
Positions	20 (4 x 5)	20 (4 x 5)	20 (4 x 5)	20 (4 x 5)	20 (4 x 5)	20 (4 x 5)
Pitch - Mating	0.050"	0.050"	0.050"	0.050"	0.050"	0.050"
Contact Finish - Mating	Tin	Tin	Tin	Tin	Tin	Tin
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
Current Rating	1 A	1 A	-	1 A	1 A	1 A
Material Flammability	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
MSL Rating	1	1	1	1	1	1
Product Status	Obsolete	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts are active products with current manufacturing status, eliminating supply chain risk associated with the obsolete A-CCS20-Z-SM-R. Selection among substitutes should prioritize:

A-CCS 020-Z-SM: Direct Assmann WSW equivalent with ROHS3 compliance and improved contact resistance (15mOhm vs. 30mOhm). Maintains identical mating pitch and tin finish specifications.
540-44-020-17-400000 and 940-44-020-17-400000: Mill-Max alternatives with extended operating temperature range (-55°C to 125°C) and ROHS3 compliance. Both feature closed frame construction and UL94 V-0 rating.
8420-21A1-RK-TP and 8420-21B1-RK-TP: 3M Series 8400 sockets with RoHS compliance. 8420-21B1-RK-TP offers ROHS3 compliance with higher inventory availability (5100 units).

All substitutes maintain UL94 V-0 flammability rating and MSL 1 moisture sensitivity classification, ensuring compliance with existing design specifications.

Frequently Asked Questions (FAQ)

Q: Can A-CCS 020-Z-SM directly replace A-CCS20-Z-SM-R without PCB redesign?

A: Yes. Both parts share identical mating pitch (0.050"), 20-position PLCC configuration, tin contact finish, and closed frame design. The primary difference is housing material (Polyamide PA9T vs. Polybutylene Terephthalate PBT) and operating temperature range (-40°C to 105°C vs. -55°C to 105°C). Verify application temperature requirements before selection.

Q: What is the significance of contact resistance differences among substitutes?

A: Contact resistance values (15mOhm to 30mOhm) fall within acceptable ranges for 1 A rated sockets. Lower contact resistance (A-CCS 020-Z-SM at 15mOhm) provides improved signal integrity and reduced heat generation. Selection depends on application sensitivity to contact resistance performance.

Q: Do all substitutes support the same solder reflow profile?

A: All substitutes feature solder termination with UL94 V-0 rated housing materials. Verify specific reflow temperature limits with individual manufacturer datasheets, as housing materials (PBT, PPS, PCT) may have different thermal specifications.

Q: Are there mechanical footprint differences between substitutes?

A: Mating pitch (0.050") and position count (20 in 4 x 5 grid) are identical across all substitutes, ensuring PCB footprint compatibility. Post pitch varies (0.050" vs. 0.100"), but this affects only the solder pad pattern on the PCB, not the component mounting interface.

Q: Which substitute offers the best long-term availability?

A: 8420-21B1-RK-TP (3M) and A-CCS 020-Z-SM (Assmann WSW) are active products with substantial inventory levels (5100 and 3707 units respectively) and ROHS3 compliance, supporting extended production lifecycles.

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