ATF1504AS-15AC44 Equivalent & Substitute Parts

Part Overview

The ATF1504AS-15AC44 is a Complex Programmable Logic Device (CPLD) manufactured by Microchip Technology, featuring 64 macrocells and 32 I/O pins in a 44-TQFP surface mount package. This device is classified as obsolete and is no longer in active production. Due to its obsolete status and limited availability for new designs, identifying functionally compatible substitute parts is essential for system continuity and component sourcing.

Substiute Parts

ATF1504AS-15AC44

Microchip TechnologyIn Stock: 740ATF1504AS-15AC44 Datasheet

Current PartRFQ

ATF1504AS-10AU44

Microchip TechnologyIn Stock: 1444ATF1504AS-10AU44 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ATF1504AS-15AC44 is determined by the following critical parameters:

• Macrocell Count: Must equal 64 macrocells to maintain functional equivalence
• I/O Pin Count: Must equal 32 I/O pins for pinout compatibility
• Package Type: Must be 44-TQFP to ensure mechanical and electrical compatibility with existing PCB layouts
• Programmable Architecture: Must support In System Programmable (ISP) functionality with minimum 10K program/erase cycles
• Series Compatibility: Parts from the ATF15xx series maintain design compatibility

The ATF1504AS-10AU44 meets all substitution criteria while offering improved electrical performance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

The ATF1504AS-10AU44 is a direct functional substitute for the ATF1504AS-15AC44. Both devices share identical macrocell count, I/O configuration, package format, and programmable architecture. The substitute part offers the following advantages:

• Active Product Status: The ATF1504AS-10AU44 is in active production, ensuring long-term availability and supply chain reliability
• Regulatory Compliance: ROHS3 compliance status provides alignment with current environmental and regulatory requirements
• Enhanced Performance: The 10 ns maximum propagation delay represents improved timing performance compared to the 15 ns specification of the main part
• Extended Operating Range: The -40°C to 85°C operating temperature range provides broader environmental compatibility

For applications requiring the specific thermal or voltage characteristics of the original part, design verification is necessary to confirm compatibility with the substitute's expanded operating parameters.

Frequently Asked Questions (FAQ)

Q: Can the ATF1504AS-10AU44 directly replace the ATF1504AS-15AC44 in existing designs?

A: Yes. Both devices feature identical macrocell count (64), I/O pin count (32), and 44-TQFP package format. The pinout and functional architecture are compatible. The substitute part's improved timing performance (10 ns vs. 15 ns) and extended operating temperature range (-40°C to 85°C vs. 0°C to 70°C) are backward compatible with designs specified for the original part.

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

A: The primary differences are propagation delay (10 ns vs. 15 ns), operating temperature range (-40°C to 85°C vs. 0°C to 70°C), voltage supply tolerance (4.5V–5.5V vs. 4.75V–5.25V), product status (Active vs. Obsolete), and RoHS compliance (ROHS3 vs. non-compliant). All functional parameters remain identical.

Q: Is the 44-TQFP package identical between both parts?

A: Yes. Both parts use the 44-TQFP (10x10) package format. PCB footprints, land patterns, and mechanical dimensions are identical, enabling direct board-level substitution.

Q: Does the substitute part support the same programming methodology?

A: Yes. Both parts support In System Programmable (ISP) functionality with a minimum of 10K program/erase cycles. Programming tools and firmware compatibility are maintained.

Q: Are there any voltage supply considerations when substituting?

A: The substitute part accepts a wider voltage supply range (4.5V–5.5V) compared to the original (4.75V–5.25V). This expanded tolerance is backward compatible with designs operating within the original specification window.