AT40K20-2AJC Equivalent & Substitute Parts

Part Overview

The AT40K20-2AJC is a Field Programmable Gate Array (FPGA) from Microchip Technology's AT40K/KLV series, featuring 1024 logic elements, 8192 RAM bits, and 62 I/O pins in an 84-LCC (J-Lead) surface mount package. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The AT40K20 base product remains available in alternative package configurations that maintain core functional equivalence while offering enhanced I/O capacity and improved compliance standards.

Substiute Parts

AT40K20-2AJC

Microchip TechnologyIn Stock: 1998AT40K20-2AJC Datasheet

Current PartRFQ

AT40K20-2BQJ

Microchip TechnologyIn Stock: 717AT40K20-2BQJ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT40K20-2AJC is based on equivalence within the AT40K/KLV series, maintaining identical core logic architecture: 1024 logic elements, 8192 RAM bits, and 30000 gates. The substitute part AT40K20-2BQJ shares these fundamental specifications while differing in the following allowed parameters:

• Package configuration (84-LCC to 144-LQFP)
• I/O pin count (62 to 114)
• Voltage supply range (4.75V–5.25V to 4.5V–5.5V)
• Operating temperature range (0°C–70°C to −40°C–85°C)
• Product status (Obsolete to Active)
• RoHS compliance level (non-compliant to ROHS3 Compliant)
• Moisture sensitivity level (MSL 2 to MSL 3)

These variations are permissible substitutions when the application requirements accommodate the enhanced specifications and package footprint of the alternative.

Parameter Comparison

Engineering Selection Recommendations

The AT40K20-2BQJ is the manufacturer-recommended substitute for the obsolete AT40K20-2AJC. Selection of this substitute is appropriate when:

• The application PCB layout can accommodate the larger 144-LQFP package (20×20 mm) versus the 84-LCC package (29.31×29.31 mm)
• The increased I/O count (114 pins versus 62 pins) aligns with system requirements or provides beneficial design flexibility
• The extended operating temperature range (−40°C to 85°C) meets or exceeds application specifications
• The wider voltage supply range (4.5V–5.5V) is compatible with the power distribution architecture
• ROHS3 compliance is required for regulatory or procurement standards
• The reduced moisture sensitivity window (168 hours at MSL 3 versus 1 year at MSL 2) is acceptable for manufacturing and storage processes

The substitute maintains identical core FPGA architecture, logic capacity, and RAM configuration, ensuring functional equivalence at the logic design level.

Frequently Asked Questions (FAQ)

Q: Can the AT40K20-2BQJ directly replace the AT40K20-2AJC without design changes?

A: The substitute shares identical logic architecture, RAM, and gate count. However, the package change from 84-LCC to 144-LQFP requires PCB layout redesign. The increased I/O pin count (114 versus 62) provides additional connectivity options but does not mandate their use.

Q: What are the key differences between these two parts?

A: The primary differences are package type, I/O pin count, operating temperature range, voltage supply range, product status, and RoHS compliance. Core FPGA specifications (logic elements, RAM bits, gates) remain identical.

Q: Is the AT40K20-2BQJ suitable for applications requiring the original operating temperature range of 0°C to 70°C?

A: Yes. The substitute's operating range of −40°C to 85°C encompasses the original specification, providing broader environmental capability.

Q: What impact does the package change have on thermal management?

A: The 144-LQFP package has a different thermal profile than the 84-LCC package. Thermal analysis specific to the application and PCB design is necessary to ensure adequate heat dissipation.

Q: Are there any supply chain considerations for the AT40K20-2BQJ?

A: The substitute is classified as Active product status with 705 units in stock, compared to the obsolete AT40K20-2AJC. This indicates better long-term availability for new production.

Q: Does the RoHS3 compliance of the substitute affect compatibility?

A: RoHS3 compliance is a material composition standard that does not affect electrical or functional compatibility. It is beneficial for applications subject to environmental regulations.