AT28C64-12JC EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AT28C64-12JC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology in a 32-PLCC package with 120 ns access time. This part is classified as obsolete, making substitute components necessary for new designs and production continuity. The part operates within a 4.5V to 5.5V supply voltage range and supports 8K x 8 memory organization with parallel interface architecture.

Key Parameters

Parameter	Value
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	Parallel
Access Time	120 ns
Voltage Supply Range	4.5V ~ 5.5V
Package Type	32-PLCC (13.97x11.43)
Mounting Type	Surface Mount
Write Cycle Time	1ms

Substitute Part Grouping Explanation

Substitution for the AT28C64-12JC is determined by strict equivalence across the following parameters:

Memory capacity: 64Kbit (8K x 8 organization)
Interface type: Parallel
Package: 32-PLCC (13.97x11.43)
Supply voltage: 4.5V ~ 5.5V
Access time: 120 ns or faster
Mounting: Surface Mount

Four qualified substitute parts meet these criteria. Substitutes are grouped by manufacturer and product status (active vs. obsolete). All substitutes maintain identical memory organization, interface architecture, and physical packaging. Access time specifications are equal to or faster than the original part, ensuring functional compatibility in timing-critical applications.

Parameter Comparison

Parameter	AT28C64-12JC	AT28C64B-15JU	AT28HC64BF-12JU	X28HC64JIZ-12	X28HC64JIZ-12T1
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Renesas Electronics	Renesas Electronics
Memory Size	64Kbit	64Kbit	64Kbit	64Kbit	64Kbit
Memory Organization	8K x 8	8K x 8	8K x 8	8K x 8	8K x 8
Memory Interface	Parallel	Parallel	Parallel	Parallel	Parallel
Access Time	120 ns	150 ns	120 ns	120 ns	120 ns
Write Cycle Time	1ms	10ms	10ms	5ms	5ms
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	32-PLCC (13.97x11.43)	32-PLCC (13.97x11.43)	32-PLCC (13.97x11.43)	32-PLCC (13.97x11.43)	32-PLCC (13.97x11.43)
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All four substitute parts are active products with ROHS3 compliance, addressing the obsolescence status of the AT28C64-12JC. Selection between substitutes depends on specific application requirements:

AT28C64B-15JU and AT28HC64BF-12JU are Microchip Technology products, maintaining manufacturer continuity. AT28C64B-15JU operates at 150 ns access time, suitable for applications with relaxed timing constraints. AT28HC64BF-12JU matches the original 120 ns access time specification and offers extended temperature range (-40°C to 85°C).

X28HC64JIZ-12 and X28HC64JIZ-12T1 are Renesas Electronics alternatives with identical 120 ns access time. X28HC64JIZ-12T1 is supplied in Tape & Reel packaging, optimized for automated assembly processes. Both Renesas parts feature 5ms write cycle time, intermediate between the original 1ms and Microchip alternatives at 10ms.

All substitutes maintain 32-PLCC package compatibility, parallel interface architecture, and 4.5V to 5.5V supply voltage specification. Extended operating temperature ranges on substitute parts provide enhanced reliability in industrial environments compared to the original 0°C to 70°C specification.

Frequently Asked Questions (FAQ)

Q: Can AT28C64B-15JU replace AT28C64-12JC directly?

A: Yes. Both parts share identical memory capacity (64Kbit), organization (8K x 8), parallel interface, 32-PLCC package, and supply voltage (4.5V ~ 5.5V). The 150 ns access time of AT28C64B-15JU is slower than the original 120 ns, but remains functionally compatible in most applications. Verify timing margins in your specific circuit design.

Q: What is the difference between AT28HC64BF-12JU and X28HC64JIZ-12?

A: Both parts provide 120 ns access time and 32-PLCC packaging. AT28HC64BF-12JU is manufactured by Microchip Technology with 10ms write cycle time. X28HC64JIZ-12 is manufactured by Renesas Electronics with 5ms write cycle time. Both operate across -40°C to 85°C temperature range and are ROHS3 compliant.

Q: Why does X28HC64JIZ-12T1 have different packaging than other substitutes?

A: X28HC64JIZ-12T1 is supplied in Tape & Reel (TR) format, designed for high-volume automated assembly. The physical 32-PLCC package remains identical to other substitutes. Tape & Reel packaging reduces manual handling and improves production efficiency in manufacturing environments.

Q: Are all substitutes RoHS compliant?

A: Yes. All four substitute parts are ROHS3 compliant. The original AT28C64-12JC is RoHS non-compliant, making substitution necessary for applications requiring RoHS compliance.

Q: What is the temperature operating range difference?

A: The original AT28C64-12JC operates 0°C to 70°C. All substitute parts operate -40°C to 85°C, providing extended temperature range suitable for industrial and automotive applications requiring wider environmental tolerance.

Q: Can I use AT28C64B-15JU in a design originally specified for AT28C64-12JC?

A: Functional compatibility exists due to matching memory organization, interface type, and package. The 150 ns access time is 30 ns slower than the original 120 ns specification. Verify that your circuit timing does not depend on the faster access time. If your design has timing margins, substitution is valid.

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