A-CCS28-Z-SM-R PLCC 28-Position Socket Equivalent & Substitute Parts

Part Overview

The A-CCS28-Z-SM-R is a 28-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 a 4 x 7 pin grid with 0.050" (1.27mm) pitch and operates across a temperature range of -55°C to 105°C.

Key Parameters

Parameter	Value
Type	PLCC
Number of Positions	28 (4 x 7)
Pitch - Mating	0.050" (1.27mm)
Mounting Type	Surface Mount
Contact Finish - Mating	Tin
Contact Material - Mating	Phosphor Bronze
Features	Closed Frame
Termination	Solder
Operating Temperature	-55°C ~ 105°C
Current Rating	1 A
Material Flammability Rating	UL94 V-0
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the A-CCS28-Z-SM-R is determined by the following critical parameters:

Type: PLCC socket configuration
Number of Positions: 28 (4 x 7) pin grid
Pitch - Mating: 0.050" (1.27mm)
Mounting Type: Surface Mount
Contact Finish - Mating: Tin plating
Features: Closed Frame design
Termination: Solder connection method
Current Rating: 1 A minimum
Material Flammability Rating: UL94 V-0
Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts listed maintain these core electrical and mechanical parameters, ensuring functional compatibility with the original A-CCS28-Z-SM-R specification.

Parameter Comparison

Parameter	A-CCS28-Z-SM-R (Main)	A-CCS 028-Z-SM	8428-21B1-RK-TP (3M)	8428-21B1-RK-TR (3M)	940-44-028-17-400000 (Mill-Max)
Manufacturer	Assmann WSW	Assmann WSW	3M	3M	Mill-Max Manufacturing
Type	PLCC	PLCC	PLCC	PLCC	PLCC
Number of Positions	28 (4 x 7)	28 (4 x 7)	28 (4 x 7)	28 (4 x 7)	28 (4 x 7)
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	Phosphor Bronze	Copper Alloy	Copper Alloy	Beryllium Copper
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Features	Closed Frame	Closed Frame	Closed Frame	Closed Frame	Closed Frame
Termination	Solder	Solder	Solder	Solder	Solder
Operating Temperature	-55°C ~ 105°C	-40°C ~ 105°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
Contact Resistance	30mOhm	15mOhm	Not specified	15mOhm	30mOhm
Material Flammability Rating	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)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts maintain active product status with ROHS3 compliance, providing long-term availability and regulatory alignment. The A-CCS 028-Z-SM from Assmann WSW represents the direct successor to the obsolete A-CCS28-Z-SM-R, offering improved contact resistance (15mOhm versus 30mOhm) while maintaining identical electrical and mechanical specifications.

The 3M 8428-21B1-RK-TP and 8428-21B1-RK-TR variants are functionally equivalent, with the primary distinction being packaging format (Tube versus Tape & Reel). Both feature copper alloy contacts and operate across -40°C to 105°C.

The Mill-Max 940-44-028-17-400000 extends the upper operating temperature to 125°C and employs beryllium copper mating contacts with brass alloy post contacts, suitable for applications requiring enhanced thermal performance.

Frequently Asked Questions (FAQ)

Q: Can the A-CCS 028-Z-SM directly replace the A-CCS28-Z-SM-R?

A: Yes. Both parts share identical PLCC 28-position configuration, 0.050" pitch, tin-plated finish, closed frame design, and solder termination. The A-CCS 028-Z-SM is the active product continuation with improved contact resistance and ROHS3 compliance.

Q: What is the difference between the 3M 8428-21B1-RK-TP and 8428-21B1-RK-TR?

A: The primary difference is packaging. The 8428-21B1-RK-TP is supplied in Tube packaging, while the 8428-21B1-RK-TR is supplied in Tape & Reel format. Electrical and mechanical specifications are identical.

Q: Does the Mill-Max 940-44-028-17-400000 offer advantages over other substitutes?

A: The Mill-Max part extends the upper operating temperature to 125°C compared to 105°C for other options, and operates down to -55°C matching the original part. This makes it suitable for applications requiring wider thermal range. Contact material composition differs (beryllium copper mating, brass alloy posts).

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed carry ROHS3 Compliant status, ensuring regulatory compliance for current manufacturing standards.

Q: What is the significance of contact resistance differences?

A: The A-CCS 028-Z-SM and 8428-21B1-RK-TR both specify 15mOhm contact resistance, compared to 30mOhm for the original A-CCS28-Z-SM-R and Mill-Max part. Lower contact resistance reduces voltage drop and heat generation, improving performance in high-current or sensitive applications.

Q: Can these parts be used interchangeably in existing designs?

A: All substitute parts maintain the same PLCC 28-position socket configuration, 0.050" pitch, and solder termination, ensuring mechanical and electrical interchangeability at the PCB level. Operating temperature ranges should be verified against application requirements.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message