ATF1504ASL-25AI44 Equivalent & Substitute Parts

Part Overview

The ATF1504ASL-25AI44 is a Complex Programmable Logic Device (CPLD) manufactured by Microchip Technology, featuring 64 macrocells and 32 I/O pins in a 44-pin TQFP package. This device is classified as obsolete and has been superseded by active alternatives. Due to its discontinued status, locating equivalent parts with identical specifications and active manufacturing support is essential for new designs and production continuity.

Substiute Parts

ATF1504ASL-25AI44

Microchip TechnologyIn Stock: 913ATF1504ASL-25AI44 Datasheet

Current PartRFQ

ATF1504ASL-25AU44

Microchip TechnologyIn Stock: 1939ATF1504ASL-25AU44 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ATF1504ASL-25AI44 is determined by strict equivalence across the following critical parameters:

• Macrocell Count: 64 macrocells (functional logic capacity)
• I/O Pin Count: 32 I/O pins (interface capability)
• Propagation Delay: 25 ns maximum (timing performance)
• Supply Voltage Range: 4.5V ~ 5.5V (power compatibility)
• Operating Temperature Range: -40°C ~ 85°C (thermal envelope)
• Package Type: 44-TQFP (10x10) (physical and electrical footprint)
• Programmable Architecture: In System Programmable with minimum 10K program/erase cycles (functional requirement)

The ATF1504ASL-25AU44 meets all these criteria and is therefore a direct functional equivalent. The primary distinction is product status and compliance certification, not electrical or mechanical performance.

Parameter Comparison

Engineering Selection Recommendations

The ATF1504ASL-25AU44 is the direct substitute for the obsolete ATF1504ASL-25AI44. Both devices are electrically and mechanically identical across all functional parameters. The ATF1504ASL-25AU44 offers the following advantages:

• Active Product Status: Currently manufactured and supported by Microchip Technology, ensuring long-term availability and supply chain reliability.
• RoHS3 Compliance: Meets current environmental and regulatory requirements, whereas the original part is RoHS non-compliant.
• Verified Programmability: Confirmed in-system programmable capability with standard 10K program/erase cycle minimum.
• Tray Packaging: Standard production packaging suitable for automated assembly and inventory management.

For new designs or production continuity, the ATF1504ASL-25AU44 is the recommended selection. Existing designs using the ATF1504ASL-25AI44 can transition to this substitute without circuit modification or re-qualification, provided compliance requirements align with the target application.

Frequently Asked Questions (FAQ)

Q: Are the ATF1504ASL-25AI44 and ATF1504ASL-25AU44 pin-compatible?

A: Yes. Both devices use the 44-TQFP (10x10) package with identical pin assignments, voltage requirements, and signal timing characteristics. Direct PCB footprint compatibility is confirmed.

Q: What is the difference between the two part numbers?

A: The suffix designates packaging type and compliance status. The ATF1504ASL-25AI44 is obsolete with non-compliant RoHS status. The ATF1504ASL-25AU44 is an active product with ROHS3 compliance and tray packaging.

Q: Can I use the ATF1504ASL-25AU44 as a direct replacement in existing applications?

A: Yes. All electrical and mechanical parameters are identical. The substitute part requires no design changes, re-layout, or firmware modifications. Compliance improvements make it suitable for regulated applications.

Q: Are there any timing or performance differences?

A: No. Both parts specify identical propagation delay (25 ns maximum), supply voltage range (4.5V ~ 5.5V), and operating temperature range (-40°C ~ 85°C). Functional performance is equivalent.

Q: What is the MSL rating, and does it affect storage or handling?

A: Both parts carry MSL 3 (168 Hours), indicating moderate moisture sensitivity. Standard ESD precautions and dry storage conditions apply. Bake-out procedures follow IPC-A-610 guidelines if moisture absorption is suspected.

Q: Is the ATF1504ASL-25AU44 available in the same quantities as the original part?

A: The ATF1504ASL-25AU44 is actively manufactured with higher inventory availability (1900 Pcs reported in stock versus 875 Pcs for the obsolete variant). Supply continuity is assured for production volumes.