AT28C64E-12PC Equivalent & Substitute Parts

Part Overview

The AT28C64E-12PC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 28-DIP package with 120 ns access time. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The part operates within a 4.5V to 5.5V supply voltage range and supports 8K x 8 memory organization with parallel interface architecture.

Substiute Parts

AT28C64E-12PC

Microchip TechnologyIn Stock: 913AT28C64E-12PC Datasheet

Current PartRFQ

AT28C64B-15PU

Microchip TechnologyIn Stock: 3411AT28C64B-15PU Datasheet

MFR RecommendedRFQ

X28HC64PZ-12

Renesas Electronics CorporationIn Stock: 2139X28HC64PZ-12 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT28C64E-12PC is determined by the following critical parameters:

• Memory capacity (64Kbit) and organization (8K x 8)
• Parallel interface architecture
• 28-DIP package footprint and pin configuration
• Supply voltage compatibility (4.5V ~ 5.5V)
• Access time specification (120 ns or faster)
• Through-hole mounting compatibility

The identified substitute parts maintain these core electrical and mechanical specifications, ensuring functional equivalence in circuit applications. Differences in write cycle time, operating temperature range, and product status are noted but do not prevent substitution where system requirements permit.

Parameter Comparison

Engineering Selection Recommendations

AT28C64B-15PU is an active-status substitute from Microchip Technology with ROHS3 compliance. This part maintains identical memory capacity, organization, and package specifications. The 150 ns access time is slower than the original 120 ns specification but remains within acceptable margins for most parallel EEPROM applications. The extended operating temperature range (-40°C to 85°C) provides broader environmental coverage. Write cycle time increases to 10ms, which may impact applications with high write frequency requirements. MSL rating of 1 provides unlimited moisture sensitivity protection.

X28HC64PZ-12 is an active-status substitute from Renesas Electronics Corporation with ROHS3 compliance. This part matches the original 120 ns access time specification and maintains identical memory organization and package footprint. Write cycle time of 5ms represents a middle ground between the original and the AT28C64B-15PU. Operating temperature range matches the original specification (0°C to 70°C). MSL rating of 3 requires controlled storage conditions (168 hours maximum at specified humidity levels).

Both substitutes are electrically and mechanically compatible with the AT28C64E-12PC. Selection between them depends on specific application requirements regarding write cycle performance, environmental operating range, and moisture sensitivity handling protocols.

Frequently Asked Questions (FAQ)

Q: Can AT28C64B-15PU replace AT28C64E-12PC in all applications?

A: AT28C64B-15PU maintains functional equivalence for memory capacity, organization, and parallel interface. The 150 ns access time is 30 ns slower than the original 120 ns specification. Applications with strict timing requirements may require verification. The extended temperature range (-40°C to 85°C) provides broader operational coverage than the original 0°C to 70°C specification.

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

A: AT28C64E-12PC specifies 200µs write cycle time. AT28C64B-15PU increases this to 10ms, while X28HC64PZ-12 specifies 5ms. Applications performing frequent write operations should account for these differences in system timing calculations.

Q: Are both substitutes RoHS compliant?

A: Yes. AT28C64B-15PU and X28HC64PZ-12 are both ROHS3 compliant. The original AT28C64E-12PC is RoHS non-compliant, making these substitutes necessary for applications requiring RoHS compliance.

Q: Does package footprint remain identical across all three parts?

A: Yes. All three parts use 28-DIP (0.600", 15.24mm) package with through-hole mounting. PCB layout and socket compatibility remain unchanged.

Q: What is the significance of MSL ratings for these parts?

A: AT28C64E-12PC and AT28C64B-15PU have MSL rating 1 (unlimited moisture sensitivity protection). X28HC64PZ-12 has MSL rating 3, requiring storage at controlled humidity levels not exceeding 168 hours. This affects component handling and storage protocols during manufacturing and assembly.

Q: Which substitute should be selected for new designs?

A: Selection depends on application-specific requirements. For applications requiring maximum access time performance matching the original specification, X28HC64PZ-12 is preferred. For applications requiring extended operating temperature range, AT28C64B-15PU is preferred. Both are active-status parts with established supply chains and ROHS3 compliance suitable for new design implementation.