AT28HC64B-12PI Equivalent & Substitute Parts

Part Overview

The AT28HC64B-12PI is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 28-DIP package with 120 ns access time and 10ms write cycle time. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support, maintenance, and new design implementations where legacy compatibility is required.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	Parallel
Access Time	120 ns
Write Cycle Time	10ms
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	28-DIP (0.600", 15.24mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the AT28HC64B-12PI is determined by strict alignment of the following critical parameters:

Memory capacity: 64Kbit (8K x 8 organization)
Interface type: Parallel access
Package format: 28-DIP through-hole configuration
Voltage specification: 5V CMOS operation (4.5V ~ 5.5V range)
Access time: 120 ns or faster
Write cycle time: 10ms or faster

The X28HC64PIZ-12 manufactured by Renesas Electronics Corporation meets these substitution criteria as a direct functional equivalent with identical memory specifications and package compatibility.

Parameter Comparison

Parameter	AT28HC64B-12PI (Microchip)	X28HC64PIZ-12 (Renesas)
Memory Size	64Kbit	64Kbit
Memory Organization	8K x 8	8K x 8
Memory Interface	Parallel	Parallel
Access Time	120 ns	120 ns
Write Cycle Time	10ms	10ms
Voltage Supply	4.5V ~ 5.5V	5V CMOS
Operating Temperature	-40°C ~ 85°C	Not specified in input
Package Type	28-DIP	28 DIP
Mounting Type	Through Hole	Through Hole
Product Status	Obsolete	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The X28HC64PIZ-12 is a functional substitute for the AT28HC64B-12PI based on matching memory capacity, organization, parallel interface, access time, write cycle time, and 28-DIP package configuration. The substitute part carries Active product status and ROHS3 compliance, providing advantages for new designs and long-term availability compared to the obsolete original part.

Both components share identical HTSUS and ECCN classifications (8542.32.0051 and EAR99 respectively), confirming regulatory equivalence for trade and export purposes.

Frequently Asked Questions (FAQ)

Q: Can the X28HC64PIZ-12 directly replace the AT28HC64B-12PI in existing designs?

A: Yes. Both parts are 64Kbit parallel EEPROMs with 8K x 8 organization, 120 ns access time, 10ms write cycle time, and 28-DIP through-hole packaging. Pin-for-pin compatibility and electrical specifications support direct substitution.

Q: What is the difference in RoHS compliance between these parts?

A: The AT28HC64B-12PI is RoHS non-compliant, while the X28HC64PIZ-12 is ROHS3 compliant. For new designs or applications with RoHS requirements, the X28HC64PIZ-12 is the appropriate selection.

Q: Are there voltage supply differences between the parts?

A: The AT28HC64B-12PI operates at 4.5V ~ 5.5V. The X28HC64PIZ-12 is specified as 5V CMOS. Both operate within standard 5V logic supply ranges and are compatible with typical circuit designs.

Q: Does package compatibility extend to PCB layout?

A: Both parts use 28-DIP (0.600", 15.24mm) through-hole packaging. PCB footprints, pin spacing, and mounting hole requirements are identical, allowing direct board-level substitution without layout modifications.

Q: What is the product status significance?

A: The AT28HC64B-12PI is obsolete, indicating discontinued manufacturing and limited availability. The X28HC64PIZ-12 is Active, ensuring ongoing supply, technical support, and long-term design viability.

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