ATF1504ASL-20JC84 Equivalent & Substitute Parts

Part Overview

The ATF1504ASL-20JC84 is a Complex Programmable Logic Device (CPLD) manufactured by Microchip Technology, featuring 64 macrocells and 64 I/O pins in an 84-pin PLCC package. This device is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement. The ATF15xx series architecture enables in-system programmability with a minimum of 10,000 program/erase cycles, supporting legacy embedded applications requiring CPLD functionality.

Substiute Parts

ATF1504ASL-20JC84

Microchip TechnologyIn Stock: 1090ATF1504ASL-20JC84 Datasheet

Current PartRFQ

ATF1504AS-10JU84

Microchip TechnologyIn Stock: 5034ATF1504AS-10JU84 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the ATF1504ASL-20JC84 is determined by the following critical parameters:

• Macrocell Count: Both main and substitute parts must maintain 64 macrocells for functional equivalence
• I/O Pin Count: Both parts must provide 64 I/O pins
• Package Type: Both parts must use 84-pin PLCC (J-Lead) configuration with identical physical dimensions (29.31x29.31 mm)
• Mounting Type: Both parts must be surface mount compatible
• Programmable Architecture: Both parts must support in-system programmability with minimum 10K program/erase cycles
• Manufacturer: Both parts are manufactured by Microchip Technology within the ATF15xx series

The ATF1504AS-10JU84 meets all these criteria, differing only in performance specifications (propagation delay) and environmental ratings, which do not affect mechanical or functional compatibility at the board level.

Parameter Comparison

Engineering Selection Recommendations

The ATF1504AS-10JU84 is a direct functional substitute for the ATF1504ASL-20JC84 based on identical macrocell architecture, I/O configuration, and package specifications. The substitute part offers the following advantages:

• Active Product Status: The ATF1504AS-10JU84 maintains active manufacturing status, ensuring long-term availability and supply chain continuity compared to the obsolete main part
• Enhanced Compliance: The substitute achieves ROHS3 compliance, meeting current regulatory requirements for electronic components
• Improved Performance Specifications: The 10 ns propagation delay provides faster logic operation compared to the 20 ns specification of the main part
• Extended Operating Range: The substitute supports -40°C to 85°C operating temperature, providing broader environmental compatibility than the 0°C to 70°C range of the main part
• Wider Supply Voltage Tolerance: The 4.5V to 5.5V supply range offers improved voltage regulation margin

Selection of the ATF1504AS-10JU84 is appropriate for new designs and legacy system updates where component obsolescence requires substitution.

Frequently Asked Questions (FAQ)

Q: Can the ATF1504AS-10JU84 be used as a direct replacement for the ATF1504ASL-20JC84 on existing PCBs?

A: Yes. Both parts share identical 84-pin PLCC package dimensions (29.31x29.31 mm), J-Lead configuration, and surface mount footprint. No PCB redesign is required for mechanical compatibility.

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

A: The primary differences are product status (obsolete vs. active), propagation delay (20 ns vs. 10 ns), operating temperature range (0°C–70°C vs. -40°C–85°C), supply voltage tolerance (4.75V–5.25V vs. 4.5V–5.5V), and RoHS compliance status (non-compliant vs. ROHS3 compliant).

Q: Will the faster propagation delay of the substitute part affect system operation?

A: No. The ATF1504AS-10JU84 provides faster logic propagation (10 ns maximum) compared to the main part (20 ns maximum). Systems designed for the slower specification will operate correctly with the faster substitute part.

Q: Are there any supply voltage considerations when substituting?

A: The substitute part accepts a wider supply voltage range (4.5V–5.5V) compared to the main part (4.75V–5.25V). Existing power supply designs for the main part will operate within the substitute part's acceptable range.

Q: What is the impact of the different operating temperature ranges?

A: The substitute part supports -40°C to 85°C operation, compared to the main part's 0°C to 70°C range. Applications operating within the original temperature specification will function correctly with the substitute part.

Q: Does the moisture sensitivity level difference affect handling procedures?

A: The main part has MSL 2 (1 Year shelf life), while the substitute has MSL 3 (168 Hours shelf life). The substitute part requires more stringent moisture control during storage and handling. Standard MSL 3 handling procedures must be followed.

Q: Are both parts in-system programmable with the same programming equipment?

A: Yes. Both parts support in-system programmability with a minimum of 10,000 program/erase cycles and are members of the ATF15xx series, ensuring compatibility with standard ATF programming tools and procedures.