AT28C64X-15PC Equivalent & Substitute Parts

Part Overview

The AT28C64X-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 obsolete status makes sourcing direct replacements critical for maintenance and production continuity.

Substiute Parts

AT28C64X-15PC

Microchip TechnologyIn Stock: 893AT28C64X-15PC Datasheet

Current PartRFQ

AT28C64B-15PU

Microchip TechnologyIn Stock: 3411AT28C64B-15PU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT28C64X-15PC is determined by strict equivalence across the following parameters:

• Memory capacity and organization (64Kbit, 8K x 8 configuration)
• Parallel interface architecture
• Access time specification (150 ns)
• Supply voltage compatibility (4.5V ~ 5.5V)
• Physical package dimensions and pin configuration (28-DIP)
• Through-hole mounting compatibility

The AT28C64B-15PU meets all these core electrical and mechanical requirements, establishing it as a direct functional equivalent despite differences in write cycle time and operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

The AT28C64B-15PU is the qualified substitute for the obsolete AT28C64X-15PC based on the following factors:

• Identical core memory specifications (64Kbit, 8K x 8, 150 ns access time, parallel interface)
• Identical electrical interface (4.5V ~ 5.5V supply, 28-DIP package)
• Active product status ensures ongoing availability and supply chain continuity
• ROHS3 compliance provides regulatory advantage over the non-compliant original part
• Extended operating temperature range (-40°C ~ 85°C) accommodates broader environmental conditions
• Write cycle time difference (10 ms vs. 1 ms) does not affect functional compatibility in standard EEPROM applications where write operations are infrequent relative to read operations

Frequently Asked Questions (FAQ)

Q: Can the AT28C64B-15PU be used as a direct pin-for-pin replacement?

A: Yes. Both parts use identical 28-DIP package geometry and pinout. No PCB modifications are required for substitution.

Q: What is the significance of the write cycle time difference between the two parts?

A: The AT28C64B-15PU has a 10 ms write cycle time compared to 1 ms for the AT28C64X-15PC. This affects the duration of individual write operations but does not impact read performance or overall system functionality in typical EEPROM applications where write operations are not time-critical.

Q: Why is RoHS compliance important for this substitution?

A: The AT28C64B-15PU is ROHS3 compliant, whereas the original part is non-compliant. This compliance status is relevant for new designs and systems subject to RoHS regulations in manufacturing and distribution.

Q: Are there any temperature-related limitations when substituting?

A: The AT28C64B-15PU operates across -40°C ~ 85°C, which exceeds the original part's 0°C ~ 70°C range. This extended range provides greater flexibility for applications requiring operation outside the original specification.

Q: Is the AT28C64B-15PU the only available substitute?

A: Based on the provided data, the AT28C64B-15PU is the documented substitute meeting all core electrical and mechanical parameters for the AT28C64X-15PC.