AT28BV64B-20SC Equivalent & Substitute Parts

Part Overview

The AT28BV64B-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

AT28BV64B-20SC

Microchip TechnologyIn Stock: 905AT28BV64B-20SC Datasheet

Current PartRFQ

AT28BV64B-20SU

Microchip TechnologyIn Stock: 3278AT28BV64B-20SU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT28BV64B-20SC is determined by strict equivalence across the following critical parameters:

• Memory capacity and organization (64Kbit, 8K x 8 configuration)
• Parallel interface architecture
• Access time specification (200 ns)
• Write cycle time (10ms)
• Supply voltage compatibility (2.7V ~ 3.6V)
• Package and pinout compatibility (28-SOIC)

The AT28BV64B-20SU qualifies as a direct substitute based on identical electrical specifications and package configuration. Differences in operating temperature range, product status, and compliance certifications do not affect functional substitutability for applications within the specified operating conditions.

Parameter Comparison

Engineering Selection Recommendations

The AT28BV64B-20SU is the direct functional equivalent of the AT28BV64B-20SC. Selection of the substitute part is supported by:

• Identical core memory specifications and electrical performance
• Active product status ensuring continued availability and supply chain support
• ROHS3 compliance, meeting current environmental and regulatory requirements
• Extended operating temperature range (-40°C to 85°C) providing broader application flexibility compared to the obsolete part (0°C to 70°C)
• Verified programmability status

For applications operating within the original temperature specification (0°C to 70°C), the AT28BV64B-20SU operates within its qualified range. Applications requiring operation below 0°C or above 70°C benefit from the extended temperature capability of the substitute part.

Frequently Asked Questions (FAQ)

Q: Are the AT28BV64B-20SC and AT28BV64B-20SU pin-compatible?

A: Yes. Both devices use the 28-SOIC package with identical pinout and electrical interface specifications, enabling direct board-level substitution without design modification.

Q: What is the primary reason for substituting the AT28BV64B-20SC?

A: The AT28BV64B-20SC is classified as obsolete. The AT28BV64B-20SU maintains identical functional specifications while offering active product status and improved compliance certifications.

Q: Does the operating temperature difference affect substitutability?

A: The AT28BV64B-20SU supports an extended temperature range (-40°C to 85°C) compared to the original part (0°C to 70°C). For applications within the original specification, both parts are functionally equivalent. Applications requiring extended temperature operation benefit from the substitute part's broader range.

Q: Is the AT28BV64B-20SU RoHS compliant?

A: Yes. The AT28BV64B-20SU is ROHS3 compliant, whereas the original AT28BV64B-20SC is RoHS non-compliant. This compliance improvement supports modern procurement and environmental requirements.

Q: Can the AT28BV64B-20SU be used in existing designs without modification?

A: Yes. Identical memory capacity, organization, interface type, access time, write cycle time, supply voltage, and package specifications enable direct substitution in existing circuit designs and PCB layouts.