EPM7128STC100-7F Equivalent & Substitute Parts

Part Overview

The EPM7128STC100-7F is a Complex Programmable Logic Device (CPLD) from Intel's MAX® 7000S series, housed in a 100-pin TQFP package. This device features 128 macrocells, 2500 gates, and a maximum propagation delay of 7.5 ns, operating within a 5V supply range. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

EPM7128STC100-7F

IntelIn Stock: 2135EPM7128STC100-7F Datasheet

Current PartRFQ

ATF1508AS-7AX100

Microchip TechnologyIn Stock: 3232ATF1508AS-7AX100 Datasheet

MFR RecommendedRFQ

XCR3128XL-7VQG100C

AMDIn Stock: 9257XCR3128XL-7VQG100C Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the EPM7128STC100-7F is determined by the following critical parameters:

• Macrocell Count: 128 macrocells (functional logic capacity)
• I/O Pin Count: Minimum 80 I/O pins required for circuit compatibility
• Propagation Delay: Maximum 7.5 ns (timing performance)
• Voltage Supply Range: 4.75V ~ 5.25V or compatible 3V logic with level translation considerations
• Package Type: 100-pin TQFP or equivalent footprint
• Programmable Architecture: In System Programmable capability
• Operating Temperature Range: 0°C ~ 70°C (TA)

The identified substitute parts meet these core electrical and mechanical requirements, enabling direct or near-direct replacement in existing designs.

Parameter Comparison

Engineering Selection Recommendations

ATF1508AS-7AX100 (Microchip Technology)

This substitute offers active product status with ROHS3 compliance. Electrical parameters match the original part exactly: 128 macrocells, 7.5 ns propagation delay, and 5V supply range. The I/O count is 80 pins versus 84 on the original, requiring verification that the design does not depend on all 84 I/O connections. The ATF15xx series supports minimum 10K program/erase cycles, providing robust reprogrammability for production environments.

XCR3128XL-7VQG100C (AMD)

This substitute carries Last Time Buy status with ROHS3 compliance. It matches the original in macrocell count (128) and I/O pin count (84), with superior propagation delay of 7 ns. The critical difference is the 3V ~ 3.6V supply range, which diverges from the original 5V specification. This part is suitable only for designs with 3V logic systems or where level translation is implemented. The CoolRunner XPLA3 architecture supports minimum 1K program/erase cycles.

Frequently Asked Questions (FAQ)

Q: Can the ATF1508AS-7AX100 replace the EPM7128STC100-7F directly?

A: The ATF1508AS-7AX100 is electrically compatible in terms of macrocell count, propagation delay, and supply voltage. However, it provides 80 I/O pins instead of 84. Direct replacement is possible only if the design uses 80 or fewer I/O connections. Pin-to-pin compatibility must be verified against the specific circuit layout.

Q: What is the primary limitation of the XCR3128XL-7VQG100C as a substitute?

A: The XCR3128XL-7VQG100C operates at 3V ~ 3.6V, whereas the original EPM7128STC100-7F requires 4.75V ~ 5.25V. This voltage incompatibility necessitates level translation circuitry or redesign of the power distribution network. The part is suitable for new 3V logic designs but not for direct board-level replacement in 5V systems.

Q: Are there package compatibility concerns between these substitutes?

A: The EPM7128STC100-7F and ATF1508AS-7AX100 both use 100-TQFP packaging (14x14 mm), ensuring mechanical compatibility. The XCR3128XL-7VQG100C uses 100-VQFP packaging, which has the same footprint dimensions but different pin assignment conventions. PCB layout verification is required before substitution.

Q: What is the significance of RoHS compliance in selecting a substitute?

A: The original EPM7128STC100-7F is RoHS non-compliant. Both substitute parts (ATF1508AS-7AX100 and XCR3128XL-7VQG100C) are ROHS3 compliant, meeting current environmental and regulatory standards for new production and procurement. This is relevant for systems subject to RoHS directives in target markets.

Q: How do program/erase cycle ratings affect long-term reliability?

A: The ATF1508AS-7AX100 supports minimum 10K program/erase cycles, while the XCR3128XL-7VQG100C supports minimum 1K cycles. For applications requiring frequent field reprogramming or development iterations, the ATF1508AS-7AX100 provides greater endurance. The original part's cycle rating is not specified in available documentation.