ATF1504AS-7AC44 Equivalent & Substitute Parts

Part Overview

The ATF1504AS-7AC44 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, which necessitates identification of functionally equivalent alternatives for ongoing design support and production requirements. The part operates within industrial temperature ranges (0°C to 70°C) and supports in-system programming with a maximum propagation delay of 7.5 nanoseconds.

Substiute Parts

ATF1504AS-7AC44

Microchip TechnologyIn Stock: 908ATF1504AS-7AC44 Datasheet

Current PartRFQ

ATF1504AS-7AX44

Microchip TechnologyIn Stock: 2170ATF1504AS-7AX44 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ATF1504AS-7AC44 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: 7.5 ns maximum (timing performance)
• Supply Voltage Range: 4.75V ~ 5.25V (electrical compatibility)
• Operating Temperature Range: 0°C ~ 70°C (thermal envelope)
• Package Type: 44-TQFP (physical and electrical footprint)
• Programming Method: In System Programmable (design methodology compatibility)

The ATF1504AS-7AX44 meets all substitution criteria, maintaining identical electrical specifications and package configuration while offering improved product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The ATF1504AS-7AX44 is the direct functional equivalent of the ATF1504AS-7AC44. Both devices share identical electrical and mechanical specifications, ensuring pin-for-pin and functional compatibility. The primary distinction lies in product lifecycle status and regulatory compliance:

• ATF1504AS-7AC44: Obsolete status with RoHS non-compliance
• ATF1504AS-7AX44: Active product status with ROHS3 compliance

For new designs and production continuity, the ATF1504AS-7AX44 is the appropriate selection. Existing designs using the ATF1504AS-7AC44 can transition to the ATF1504AS-7AX44 without modification to PCB layout, firmware, or system integration, as all functional and electrical parameters remain unchanged.

Frequently Asked Questions (FAQ)

Q: Are the ATF1504AS-7AC44 and ATF1504AS-7AX44 pin-compatible?

A: Yes. Both devices use the 44-TQFP package with identical pin assignments, voltage requirements, and I/O configurations. Direct PCB substitution is possible without layout modifications.

Q: What is the difference between the -7AC44 and -7AX44 suffixes?

A: The suffix designates packaging and compliance specifications. The -7AC44 variant is obsolete and RoHS non-compliant, while the -7AX44 is an active product with ROHS3 compliance. Electrical performance is identical.

Q: Can I use the ATF1504AS-7AX44 in designs originally specified for the ATF1504AS-7AC44?

A: Yes. The ATF1504AS-7AX44 maintains all electrical specifications, timing characteristics, and functional capabilities of the ATF1504AS-7AC44. No design changes are required.

Q: What is the significance of the 44-TQFP (10x10) package designation?

A: This specifies a 44-pin Thin Quad Flat Pack with 10mm × 10mm body dimensions. Both substitute parts use this identical package, ensuring mechanical and thermal compatibility with existing PCB designs.

Q: Are there any programming or configuration differences between these parts?

A: No. Both devices support in-system programming with identical program/erase cycle specifications (minimum 10K cycles). Existing firmware and configuration files are directly compatible.

Q: Why is RoHS compliance important for this substitution?

A: ROHS3 compliance ensures the ATF1504AS-7AX44 meets current environmental and regulatory standards for electronic components. This is particularly relevant for products destined for markets with mandatory RoHS requirements.