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

Part Overview

The A-CCS20-Z is a 20-position PLCC socket manufactured by Assmann WSW Components, designed for through-hole mounting applications requiring closed-frame IC socket connectivity. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing production support and design continuity. The socket accommodates 4 x 5 position PLCC packages with tin-plated phosphor bronze contacts and operates across the industrial temperature range of -55°C to 105°C.

Key Parameters

Parameter	Value
Type	PLCC Socket
Number of Positions	20 (4 x 5)
Mating Pitch	0.050" (1.27mm)
Post Pitch	0.100" (2.54mm)
Mounting Type	Through Hole
Contact Finish - Mating	Tin
Contact Finish - Post	Tin
Housing Material	Polybutylene Terephthalate (PBT), Glass Filled
Operating Temperature Range	-55°C ~ 105°C
Current Rating	1 A
Contact Resistance	30mOhm
Flammability Rating	UL94 V-0
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

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

Socket type and position count: 20-position PLCC configuration (4 x 5 grid)
Pitch specifications: 0.050" (1.27mm) mating pitch and 0.100" (2.54mm) post pitch
Mounting configuration: Through-hole solder termination
Contact system: Tin-plated finish on both mating and post contacts
Housing material: PBT glass-filled construction
Electrical performance: 1 A current rating and contact resistance within acceptable range
Environmental compliance: UL94 V-0 flammability rating and MSL 1 classification

The substitute part 8420-11B1-RK-TP (3M, Series 8400) meets all critical functional and mechanical parameters required for direct substitution. Variations in contact material composition (copper alloy versus phosphor bronze), contact finish thickness tolerances, and operating temperature lower bound do not preclude functional equivalence in standard applications.

Parameter Comparison

Parameter	A-CCS20-Z (Assmann)	8420-11B1-RK-TP (3M)
Type	PLCC Socket	PLCC Socket
Number of Positions	20 (4 x 5)	20 (4 x 5)
Pitch - Mating	0.050" (1.27mm)	0.050" (1.27mm)
Pitch - Post	0.100" (2.54mm)	0.100" (2.54mm)
Contact Finish - Mating	Tin	Tin
Contact Finish - Post	Tin	Tin
Housing Material	PBT, Glass Filled	PBT, Glass Filled
Mounting Type	Through Hole	Through Hole
Operating Temperature	-55°C ~ 105°C	-40°C ~ 105°C
Current Rating	1 A	1 A
Flammability Rating	UL94 V-0	UL94 V-0
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active
RoHS Status	Non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The 8420-11B1-RK-TP represents a direct functional equivalent for applications currently using the A-CCS20-Z. The substitute part is manufactured by 3M, an established supplier in the connector socket category, and maintains active product status with documented availability.

For applications subject to RoHS3 compliance requirements, the 8420-11B1-RK-TP is the appropriate selection, as the original A-CCS20-Z does not meet current regulatory standards. Both parts satisfy UL94 V-0 flammability requirements and MSL 1 moisture sensitivity classification.

The operating temperature lower bound difference (-40°C versus -55°C) is relevant only for applications requiring operation below -40°C. For standard industrial temperature ranges, this parameter does not restrict substitution.

Frequently Asked Questions (FAQ)

Q: Can the 8420-11B1-RK-TP directly replace the A-CCS20-Z on existing PCBs?

A: Yes. Both sockets share identical pitch specifications (0.050" mating, 0.100" post), position count (20), and through-hole termination post length within tolerance (0.130" versus 0.132"). PCB footprints are compatible without modification.

Q: What is the significance of the contact material difference (phosphor bronze versus copper alloy)?

A: Both materials provide equivalent electrical performance for the specified 1 A current rating and contact resistance requirements. The contact finish (tin plating) is identical on both parts, determining the primary electrical interface characteristics.

Q: Is the 8420-11B1-RK-TP suitable for applications requiring -55°C operation?

A: The 8420-11B1-RK-TP is rated to -40°C minimum. Applications requiring -55°C operation must confirm compatibility with the substitute part's lower temperature bound or identify alternative sources for the original A-CCS20-Z.

Q: What packaging format is the 8420-11B1-RK-TP supplied in?

A: The 8420-11B1-RK-TP is supplied in tube packaging, compared to the original part's unspecified packaging. Verify tube quantity and handling requirements for production integration.

Q: Are both parts REACH compliant?

A: Yes. Both the A-CCS20-Z and 8420-11B1-RK-TP are classified as REACH Unaffected, indicating no regulatory restriction on use or supply.

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