M4A3-64/32-55VC Equivalent & Substitute Parts

Part Overview

The M4A3-64/32-55VC is a Complex Programmable Logic Device (CPLD) from Lattice Semiconductor Corporation's ispMACH® 4A series. This embedded integrated circuit features 64 macrocells, 32 I/O pins, and a propagation delay of 5.5 ns in a 44-TQFP surface mount package. The device is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support, redesigns, and production continuity.

Substiute Parts

M4A3-64/32-55VC

Lattice Semiconductor CorporationIn Stock: 999M4A3-64/32-55VC Datasheet

Current PartRFQ

ATF1504ASV-15AU44

Microchip TechnologyIn Stock: 1889ATF1504ASV-15AU44 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the M4A3-64/32-55VC is determined by the following critical parameters:

• Macrocell Count: 64 macrocells (functional logic capacity)
• I/O Pin Count: 32 I/O pins (interface capability)
• Package Type: 44-TQFP (10x10) surface mount (physical and electrical compatibility)
• Voltage Supply: 3V ~ 3.6V internal supply (power compatibility)
• Programmable Type: In System Programmable (field programmability requirement)
• Mounting Type: Surface Mount (assembly compatibility)

The ATF1504ASV-15AU44 from Microchip Technology meets all these core substitution criteria. While the propagation delay differs (15 ns versus 5.5 ns), this represents a relaxation of timing performance rather than a constraint, making it suitable for applications where the original 5.5 ns specification is not a hard requirement.

Parameter Comparison

Engineering Selection Recommendations

The ATF1504ASV-15AU44 is the qualified substitute for the M4A3-64/32-55VC based on the following factors:

Product Status: The original M4A3-64/32-55VC is obsolete, while the ATF1504ASV-15AU44 is active and in production. This ensures long-term availability and supply chain continuity.

Compliance: The substitute part is ROHS3 compliant, whereas the original is RoHS non-compliant. For applications subject to RoHS regulations, the substitute provides regulatory alignment.

Functional Equivalence: Both devices share identical macrocell count (64), I/O pin count (32), package type (44-TQFP), voltage supply range (3V ~ 3.6V), and in-system programmability. These parameters ensure functional compatibility at the circuit level.

Performance Trade-off: The substitute exhibits a longer propagation delay (15 ns versus 5.5 ns). Selection should be based on system timing requirements. Applications with timing margins greater than 9.5 ns can accommodate this difference without functional impact.

Temperature Range: The substitute supports an extended operating temperature range (-40°C ~ 85°C) compared to the original (0°C ~ 70°C), providing greater flexibility for industrial and extended-temperature applications.

Frequently Asked Questions (FAQ)

Q: Can the ATF1504ASV-15AU44 directly replace the M4A3-64/32-55VC without PCB modifications?

A: Yes. Both devices use identical 44-TQFP (10x10) packaging with the same pin count and pinout compatibility. No PCB layout changes are required for physical substitution.

Q: What is the impact of the 15 ns propagation delay versus the original 5.5 ns specification?

A: The substitute has a 9.5 ns longer propagation delay. This affects maximum operating frequency and signal timing. Verify that your application's timing budget accommodates this difference. If the original 5.5 ns specification is a hard requirement, this substitute is not suitable.

Q: Are the programming algorithms compatible between the two devices?

A: Both devices support In System Programmable (ISP) functionality. However, programming tools and algorithms may differ between manufacturers. Verify that your programming equipment supports the ATF15xx series before implementation.

Q: Does the extended temperature range of the substitute affect reliability?

A: The ATF1504ASV-15AU44 supports -40°C ~ 85°C operation, compared to the original 0°C ~ 70°C. This represents an expanded operating envelope and does not indicate reduced reliability within the specified range.

Q: Is the RoHS3 compliance of the substitute a requirement for my application?

A: RoHS3 compliance is mandatory for products sold in the European Union and many other regulated markets. If your application is subject to RoHS regulations, the substitute's compliance is a significant advantage over the non-compliant original.

Q: What is the minimum program/erase cycle rating for the substitute?

A: The ATF1504ASV-15AU44 supports a minimum of 10,000 program/erase cycles, ensuring durability for field reprogramming and development applications.