ATF1508AS-7JC84 Equivalent & Substitute Parts

Part Overview

The ATF1508AS-7JC84 is a Complex Programmable Logic Device (CPLD) manufactured by Microchip Technology, featuring 128 macrocells and 64 I/O pins in an 84-pin PLCC package. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement requirements. The part operates within the 0°C to 70°C temperature range with a maximum propagation delay of 7.5 ns and supports in-system programming with a minimum of 10,000 program/erase cycles.

Substiute Parts

ATF1508AS-7JC84

Microchip TechnologyIn Stock: 2861ATF1508AS-7JC84 Datasheet

Current PartRFQ

ATF1508AS-7JX84

Microchip TechnologyIn Stock: 820ATF1508AS-7JX84 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ATF1508AS-7JC84 is determined by strict equivalence across the following critical parameters:

• Macrocell Count: 128 macrocells (functional logic capacity)
• I/O Pin Count: 64 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: 84-LCC (J-Lead) in 84-PLCC footprint (physical compatibility)
• Programmable Type: In System Programmable with minimum 10K cycles (programming capability)

Parts meeting all these parameters are classified as direct substitutes. Variations in product status, compliance certifications, or moisture sensitivity level do not affect functional substitutability but may impact procurement and environmental compliance requirements.

Parameter Comparison

Engineering Selection Recommendations

The ATF1508AS-7JX84 is a direct functional substitute for the ATF1508AS-7JC84. Both devices share identical electrical specifications, timing characteristics, and physical packaging. The primary distinction is product lifecycle status: the original part is obsolete while the substitute is active in production.

For new designs or ongoing procurement, the ATF1508AS-7JX84 is the appropriate selection. This part maintains full functional compatibility while offering the advantage of active manufacturer support and availability. The substitute also provides ROHS3 compliance, which may be required for applications subject to environmental regulations.

The difference in Moisture Sensitivity Level (MSL 2 versus MSL 3) reflects different storage and handling requirements. MSL 3 (168 hours) is more restrictive than MSL 2 (1 year), requiring closer attention to moisture control during storage and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the ATF1508AS-7JX84 be used as a direct replacement for the ATF1508AS-7JC84 in existing designs?

A: Yes. Both parts are electrically and mechanically identical across all functional parameters: 128 macrocells, 64 I/O pins, 7.5 ns propagation delay, 4.75V–5.25V supply voltage, 0°C–70°C operating temperature, and 84-PLCC package. No design modifications are required.

Q: What is the significance of the product status difference (Obsolete vs. Active)?

A: The ATF1508AS-7JC84 is no longer manufactured or supported by Microchip Technology. The ATF1508AS-7JX84 remains in active production, ensuring availability, technical support, and compliance with current manufacturing standards.

Q: How does the RoHS compliance difference affect component selection?

A: The substitute part (ATF1508AS-7JX84) is ROHS3 compliant, meaning it meets current Restriction of Hazardous Substances regulations. The original part is non-compliant. For applications subject to RoHS requirements, the substitute is mandatory.

Q: What does the Moisture Sensitivity Level (MSL) difference mean for handling?

A: MSL 2 allows one year of dry storage before baking is required. MSL 3 allows only 168 hours (7 days) of dry storage. The substitute requires more stringent moisture control during storage and must be baked before assembly if storage time exceeds the specified period.

Q: Are the package dimensions identical?

A: Yes. Both parts use the 84-PLCC package with dimensions of 29.31 × 29.31 mm. PCB footprints and assembly processes are identical.

Q: Is programming compatibility maintained between the two parts?

A: Yes. Both devices support in-system programming with a minimum of 10,000 program/erase cycles. Programming algorithms and procedures are identical.