AT28C64E-20SC Equivalent & Substitute Parts

Part Overview

The AT28C64E-20SC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology in a 28-SOIC surface mount package. This device features a 200 ns access time and operates across a 4.5V to 5.5V supply voltage range with an operating temperature range of 0°C to 70°C. The AT28C64E-20SC is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support and component procurement.

Substiute Parts

AT28C64E-20SC

Microchip TechnologyIn Stock: 929AT28C64E-20SC Datasheet

Current PartRFQ

AT28C64B-15SU

Microchip TechnologyIn Stock: 17897AT28C64B-15SU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT28C64E-20SC is determined by the following critical parameters:

• Memory capacity and organization (64Kbit, 8K x 8 configuration)
• Memory interface type (Parallel)
• Package and pinout compatibility (28-SOIC)
• Voltage supply compatibility (4.5V ~ 5.5V)
• Access time performance (200 ns or faster)

The AT28C64B-15SU qualifies as a direct substitute based on identical memory capacity, organization, interface type, and package specification. The substitute maintains the same 28-SOIC pinout and operates within the required voltage supply range. The AT28C64B-15SU provides improved access time performance (150 ns versus 200 ns) and extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), making it functionally compatible for applications requiring the AT28C64E-20SC.

Parameter Comparison

Engineering Selection Recommendations

The AT28C64B-15SU is the recommended substitute for the obsolete AT28C64E-20SC. The substitute part maintains active product status with verified programmability and ROHS3 compliance, addressing both component availability and regulatory requirements. The AT28C64B-15SU provides superior access time performance and an extended operating temperature range, supporting a broader range of application environments. Both parts share identical memory capacity, organization, interface architecture, and 28-SOIC package specification, ensuring direct functional compatibility without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the AT28C64B-15SU directly replace the AT28C64E-20SC in existing designs?

A: Yes. Both parts feature identical 64Kbit capacity, 8K x 8 organization, parallel interface, and 28-SOIC package pinout. The substitute operates within the same 4.5V to 5.5V supply voltage range and provides faster access time (150 ns versus 200 ns), ensuring functional compatibility without circuit modification.

Q: What are the key differences between these parts?

A: The AT28C64B-15SU offers improved access time performance (150 ns), extended operating temperature range (-40°C to 85°C), active product status, ROHS3 compliance, and verified programmability. The AT28C64E-20SC is obsolete and RoHS non-compliant.

Q: Are the package dimensions identical?

A: Yes. Both parts use the 28-SOIC package with 0.295" width and 7.50mm body width, ensuring identical PCB footprint and mounting compatibility.

Q: Does the substitute part require any circuit modifications?

A: No circuit modifications are required. The AT28C64B-15SU maintains identical pinout, voltage supply requirements, and memory interface specifications as the AT28C64E-20SC.

Q: What is the significance of the faster access time in the substitute part?

A: The AT28C64B-15SU provides 150 ns access time compared to the 200 ns specification of the AT28C64E-20SC. This represents improved performance that maintains backward compatibility with designs requiring the original 200 ns specification.