AT28C64E-15JC Equivalent & Substitute Parts

Part Overview

The AT28C64E-15JC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 32-PLCC package with 150 ns access time. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and legacy system replacements. The part operates within a 4.5V to 5.5V supply range and supports 8K x 8 memory organization with parallel interface architecture.

Substiute Parts

AT28C64E-15JC

Microchip TechnologyIn Stock: 20372AT28C64E-15JC Datasheet

Current PartRFQ

AT28C64B-15JU

Microchip TechnologyIn Stock: 16725AT28C64B-15JU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT28C64E-15JC is determined by strict alignment with the following electrical and mechanical parameters:

• Memory Capacity & Organization: Substitute parts must provide 64Kbit capacity in 8K x 8 configuration
• Interface Type: Parallel interface architecture is mandatory
• Access Time: 150 ns access time specification must be maintained or improved
• Supply Voltage: 4.5V to 5.5V operating range compatibility
• Package Compatibility: 32-PLCC (J-Lead) surface mount package with identical pinout
• Base Product Series: AT28C64 series designation

The AT28C64B-15JU meets all substitution criteria as an active product variant within the same base series, maintaining identical memory specifications, package geometry, and electrical characteristics while offering extended operating temperature range and improved product status.

Parameter Comparison

Engineering Selection Recommendations

The AT28C64B-15JU is the qualified substitute for AT28C64E-15JC applications based on the following factors:

• Product Availability: AT28C64B-15JU maintains active product status with verified inventory, whereas AT28C64E-15JC is obsolete
• Regulatory Compliance: AT28C64B-15JU achieves ROHS3 compliance, meeting current environmental and manufacturing standards
• Temperature Range: Extended operating range (-40°C to 85°C) provides broader application flexibility compared to the original part (0°C to 70°C)
• Programmability Verification: AT28C64B-15JU is verified as programmable through DiGi-Electronics, ensuring functional compatibility
• Electrical Equivalence: Identical memory capacity, organization, access time, and supply voltage specifications ensure direct functional replacement

Frequently Asked Questions (FAQ)

Q: Can AT28C64B-15JU be used as a direct replacement for AT28C64E-15JC?

A: Yes. Both parts share identical memory specifications (64Kbit, 8K x 8 organization), parallel interface, 150 ns access time, 4.5V to 5.5V supply voltage, and 32-PLCC package geometry. Pin-for-pin compatibility is maintained.

Q: What is the difference in write cycle time between these parts?

A: AT28C64E-15JC specifies 200µs write cycle time, while AT28C64B-15JU specifies 10ms. This difference does not affect substitution eligibility, as both values are within acceptable EEPROM write performance parameters for parallel interface devices.

Q: Does the extended temperature range of AT28C64B-15JU affect compatibility?

A: No. The extended range (-40°C to 85°C versus 0°C to 70°C) represents an improvement that maintains backward compatibility. Applications operating within the original temperature specification will function identically.

Q: Is RoHS compliance a functional requirement for substitution?

A: RoHS compliance is a regulatory and manufacturing standard. AT28C64B-15JU's ROHS3 compliance satisfies current environmental requirements, whereas AT28C64E-15JC's non-compliance may restrict use in regulated applications or new designs.

Q: Are there any pinout differences between the 32-PLCC packages?

A: No. Both parts use identical 32-PLCC (J-Lead) package geometry with matching pinout. No PCB layout modifications are required for substitution.