AT28BV64-20SC Equivalent & Substitute Parts

Part Overview

The AT28BV64-20SC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology in a 28-SOIC package. This device is classified as obsolete, which necessitates identification of equivalent substitute components for ongoing design support and production requirements. The part operates with a 200 ns access time and supports a 2.7V to 3.6V supply voltage range, making it suitable for embedded systems requiring non-volatile memory storage.

Substiute Parts

AT28BV64-20SC

Microchip TechnologyIn Stock: 2024AT28BV64-20SC Datasheet

Current PartRFQ

AT28BV64B-20SU

Microchip TechnologyIn Stock: 3278AT28BV64B-20SU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT28BV64-20SC is determined by strict equivalence in the following parameters:

• Memory capacity: 64Kbit
• Memory organization: 8K x 8 configuration
• Interface type: Parallel
• Package specification: 28-SOIC form factor
• Supply voltage compatibility: 2.7V ~ 3.6V range
• Access time: 200 ns

The AT28BV64B-20SU qualifies as a direct substitute based on matching all critical electrical and mechanical parameters. Differences in write cycle time, operating temperature range, and product status do not affect functional substitutability for applications designed around the original part's specifications.

Parameter Comparison

Engineering Selection Recommendations

The AT28BV64B-20SU is the recommended substitute for the obsolete AT28BV64-20SC. Both parts maintain identical core memory specifications and package dimensions, ensuring direct compatibility in existing PCB layouts and circuit designs.

The substitute part offers advantages in product lifecycle status, being actively manufactured and supported. The AT28BV64B-20SU achieves ROHS3 compliance, meeting current environmental and regulatory requirements. The extended operating temperature range (-40°C to 85°C) provides broader environmental tolerance compared to the original part's 0°C to 70°C specification.

The increased write cycle time of 10ms in the substitute part versus 3ms in the original does not affect substitutability for standard EEPROM applications where write operations are not time-critical operations within the application's operational constraints.

Frequently Asked Questions (FAQ)

Q: Can AT28BV64B-20SU be used as a direct replacement for AT28BV64-20SC?

A: Yes. Both parts share identical memory capacity (64Kbit), organization (8K x 8), parallel interface, access time (200 ns), supply voltage range (2.7V ~ 3.6V), and 28-SOIC package specifications. Pin-for-pin compatibility is maintained.

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

A: The AT28BV64-20SC specifies 3ms write cycle time, while the AT28BV64B-20SU specifies 10ms. This difference does not affect substitutability for applications where write operations are not performed at maximum frequency.

Q: Does the extended temperature range of the substitute part affect compatibility?

A: No. The AT28BV64B-20SU operating range of -40°C to 85°C encompasses the original part's 0°C to 70°C range. Applications designed for the original specification will operate within the substitute part's qualified temperature envelope.

Q: Is the RoHS compliance difference significant for substitution?

A: The AT28BV64B-20SU meets ROHS3 compliance requirements, while the original part is non-compliant. For new designs and production environments with RoHS requirements, the substitute part is the appropriate selection.

Q: Are there any package or pinout differences?

A: No. Both parts use the 28-SOIC package with identical 0.295" width and 7.50mm dimensions. PCB footprints and assembly processes remain unchanged.