ATF1504ASL-20AC100 Equivalent & Substitute Parts

Part Overview

The ATF1504ASL-20AC100 is a Complex Programmable Logic Device (CPLD) manufactured by Microchip Technology, featuring 64 macrocells and 64 I/O pins in a 100-TQFP surface mount package. This device is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement.

The ATF1504ASL-20AC100 operates with a maximum propagation delay of 20 nanoseconds and requires a 4.75V to 5.25V internal supply voltage. As an in-system programmable device with a minimum of 10,000 program/erase cycles, it is suitable for embedded applications requiring field-reprogrammable logic.

Due to its obsolete status, sourcing direct replacements from current inventory requires evaluation of functionally equivalent alternatives that maintain electrical and mechanical compatibility.

Substiute Parts

ATF1504ASL-20AC100

Microchip TechnologyIn Stock: 1356ATF1504ASL-20AC100 Datasheet

Current PartRFQ

ATF1504ASL-25AU100

Microchip TechnologyIn Stock: 1000153ATF1504ASL-25AU100 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ATF1504ASL-20AC100 is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Identical macrocell count (64 macrocells)
• Identical I/O pin count (64 I/O)
• Compatible package type (100-TQFP)
• In-system programmable capability with minimum 10K program/erase cycles
• Same series family (ATF15xx)

Acceptable Variation Parameters:

• Propagation delay (tpd) may be equal to or greater than the original specification
• Operating temperature range may be extended (wider range acceptable)
• Voltage supply range may be extended (wider range acceptable)
• Product status may transition from obsolete to active

The ATF1504ASL-25AU100 qualifies as a direct substitute based on these criteria. While it specifies a maximum propagation delay of 25 nanoseconds (compared to 20 nanoseconds for the original), this represents a relaxed timing specification that does not restrict its use in applications designed for the original part. The extended operating temperature range (-40°C to 85°C) and wider voltage supply range (4.5V to 5.5V) provide enhanced operational flexibility.

Parameter Comparison

Engineering Selection Recommendations

The ATF1504ASL-25AU100 is the qualified substitute for the ATF1504ASL-20AC100 based on the following engineering criteria:

Product Status: The substitute part maintains active product status with current manufacturer support, addressing the obsolescence of the original part. This ensures ongoing availability and technical documentation access.

Compliance & Certifications: The ATF1504ASL-25AU100 achieves ROHS3 compliance, whereas the original part is RoHS non-compliant. Both parts maintain identical REACH unaffected status and EAR99 export classification.

Electrical Parameters: The substitute part's relaxed propagation delay specification (25 ns versus 20 ns) does not restrict its application in designs originally specified for the 20 ns variant. The extended voltage supply range (4.5V to 5.5V) and expanded operating temperature range (-40°C to 85°C) provide operational margins beyond the original specification.

Physical & Functional Compatibility: Identical macrocell count, I/O configuration, package type, and in-system programmable capability ensure direct functional substitution without design modification.

Frequently Asked Questions (FAQ)

Q: Can the ATF1504ASL-25AU100 be used as a direct replacement for the ATF1504ASL-20AC100?

A: Yes. Both devices share identical macrocell count (64), I/O pin count (64), package type (100-TQFP), and in-system programmable capability. The substitute part's 25 ns propagation delay specification is compatible with applications designed for the original 20 ns specification.

Q: What is the significance of the propagation delay difference between the two parts?

A: Propagation delay (tpd) defines the maximum time required for a logic signal to traverse the device. The ATF1504ASL-25AU100 specifies 25 nanoseconds maximum delay compared to 20 nanoseconds for the original part. This represents a relaxed specification; applications designed for 20 ns operation remain compatible with the 25 ns variant provided timing margins exist in the original design.

Q: Are there differences in operating temperature ranges?

A: Yes. The original part operates from 0°C to 70°C, while the substitute operates from -40°C to 85°C. The substitute's extended range provides enhanced operational flexibility for applications requiring wider temperature performance.

Q: What is the impact of the voltage supply range difference?

A: The original part requires 4.75V to 5.25V internal supply voltage. The substitute accepts 4.5V to 5.5V, providing wider voltage tolerance. This extended range accommodates applications with less stringent power supply regulation.

Q: Are the packages physically identical?

A: Yes. Both parts use the 100-TQFP package with 14x14 millimeter dimensions. No PCB layout modifications are required for substitution.

Q: What is the difference in RoHS compliance status?

A: The original part is RoHS non-compliant, while the substitute achieves ROHS3 compliance. For applications subject to RoHS regulatory requirements, the substitute part satisfies compliance obligations.

Q: Is the programmable capability identical between the two parts?

A: Yes. Both devices support in-system programming with a minimum of 10,000 program/erase cycles, ensuring equivalent field-reprogrammability.

Q: What is the inventory status difference?

A: The original part (ATF1504ASL-20AC100) is classified as obsolete with limited inventory availability. The substitute part (ATF1504ASL-25AU100) maintains active product status with significantly higher inventory levels, ensuring reliable procurement for ongoing production requirements.