AT28C64-15PC Equivalent & Substitute Parts

Part Overview

The AT28C64-15PC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 28-DIP package with 150 ns access time. This part is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs. The AT28C64-15PC operates within a 4.5V to 5.5V supply voltage range and supports 8K x 8 memory organization with parallel interface architecture.

Substiute Parts

AT28C64-15PC

Microchip TechnologyIn Stock: 1343AT28C64-15PC Datasheet

Current PartRFQ

AT28C64B-15PU

Microchip TechnologyIn Stock: 3411AT28C64B-15PU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT28C64-15PC is determined by the following critical parameters:

• Memory capacity (64Kbit) and organization (8K x 8)
• Parallel interface architecture
• Package form factor (28-DIP)
• Access time specification (150 ns)
• Supply voltage compatibility (4.5V ~ 5.5V)

The AT28C64B-15PU qualifies as a direct substitute based on matching all core electrical and mechanical parameters. Both parts share identical memory capacity, organization, interface type, access time, voltage range, and physical package dimensions. The primary distinction lies in product status and operating temperature range, which do not affect functional substitution in applications designed for the original part.

Parameter Comparison

Engineering Selection Recommendations

The AT28C64B-15PU is the direct functional equivalent for AT28C64-15PC applications. Selection of the AT28C64B-15PU is supported by:

• Active product status, ensuring long-term availability and supply chain continuity
• ROHS3 compliance, meeting modern environmental and regulatory requirements
• Extended operating temperature range (-40°C to 85°C) providing broader application flexibility
• Identical electrical specifications and physical package dimensions enabling direct socket replacement
• Verified programmability status confirming production-ready functionality

The AT28C64B-15PU accommodates the original part's operating temperature range (0°C to 70°C) within its extended specification window, ensuring compatibility with existing thermal requirements.

Frequently Asked Questions (FAQ)

Q: Can the AT28C64B-15PU replace the AT28C64-15PC in existing designs?

A: Yes. Both parts share identical memory capacity (64Kbit), organization (8K x 8), parallel interface, access time (150 ns), supply voltage range (4.5V to 5.5V), and 28-DIP package dimensions. The AT28C64B-15PU operates within the original part's temperature specification range and provides direct functional substitution.

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

A: The AT28C64-15PC specifies 1ms write cycle time, while the AT28C64B-15PU specifies 10ms. This difference does not affect substitution eligibility, as write cycle time is a performance characteristic rather than a compatibility parameter. Applications tolerating the original 1ms specification will function with the 10ms write cycle time, though write operations require extended duration.

Q: Why is the AT28C64B-15PU recommended over the obsolete AT28C64-15PC?

A: The AT28C64B-15PU holds active product status, ensuring availability from authorized distributors and manufacturers. The obsolete status of the AT28C64-15PC creates supply chain risk and limits sourcing options. Additionally, the AT28C64B-15PU meets ROHS3 compliance requirements, aligning with current environmental regulations and manufacturing standards.

Q: Are there package or pinout differences between these parts?

A: No. Both parts use identical 28-DIP (0.600", 15.24mm) through-hole packages with matching pinout configurations. Physical and electrical compatibility is complete, enabling direct board-level substitution without layout modifications.

Q: Does the extended temperature range of the AT28C64B-15PU affect its use in standard applications?

A: No. The AT28C64B-15PU's extended operating range (-40°C to 85°C) encompasses the original part's specification (0°C to 70°C). Applications designed for the AT28C64-15PC operate within the substitute part's qualified range without performance degradation.