AT28HC64B-70JC EEPROM Equivalent & Substitute Parts

Part Overview

The AT28HC64B-70JC is a 64Kbit parallel EEPROM manufactured by Microchip Technology, packaged in a 32-PLCC configuration with 70 ns access time. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. The part operates within the 4.5V to 5.5V supply 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	70 ns
Write Cycle Time	10ms
Voltage Supply Range	4.5V ~ 5.5V
Package Type	32-PLCC (13.97x11.43)
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 70°C

Substitute Part Grouping Explanation

Substitution for the AT28HC64B-70JC is determined by strict alignment of electrical and mechanical parameters. All substitute parts must maintain:

Memory capacity of 64Kbit with 8K x 8 organization
Parallel interface architecture
32-PLCC package footprint (13.97x11.43mm)
Supply voltage compatibility within 4.5V to 5.5V range
Access time equal to or faster than 70 ns
Write cycle time equal to or faster than 10ms

The substitute parts identified are manufactured by Renesas Electronics Corporation and meet all specified electrical and mechanical requirements. These parts are available in active product status with current inventory.

Parameter Comparison

Parameter	AT28HC64B-70JC	X28HC64JIZ-12	X28HC64JIZ-12T1	X28HC64JIZ-90T1
Manufacturer	Microchip Technology	Renesas Electronics	Renesas Electronics	Renesas Electronics
Memory Size	64Kbit	64Kbit	64Kbit	64Kbit
Memory Organization	8K x 8	8K x 8	8K x 8	8K x 8
Access Time	70 ns	120 ns	120 ns	90 ns
Write Cycle Time	10ms	5ms	5ms	5ms
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Package Type	32-PLCC	32-PLCC	32-PLCC	32-PLCC
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three Renesas substitute parts satisfy the core electrical and mechanical compatibility requirements for the AT28HC64B-70JC. Selection among these options depends on specific application constraints:

X28HC64JIZ-90T1 provides the closest access time performance at 90 ns, representing the minimal performance trade-off from the original 70 ns specification. This part is suitable for applications where timing margins are critical.

X28HC64JIZ-12 and X28HC64JIZ-12T1 operate at 120 ns access time. The primary distinction between these two is packaging format: X28HC64JIZ-12 is supplied in standard packaging, while X28HC64JIZ-12T1 is supplied in Tape & Reel format for automated assembly processes.

All substitute parts feature improved write cycle time (5ms versus 10ms), expanded operating temperature range (-40°C to 85°C versus 0°C to 70°C), and ROHS3 compliance, addressing modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can X28HC64JIZ-90T1 be used as a direct replacement for AT28HC64B-70JC?

A: Yes. The X28HC64JIZ-90T1 maintains identical memory capacity, organization, parallel interface, supply voltage range, and 32-PLCC package footprint. The 90 ns access time is faster than the original 70 ns specification, ensuring timing compatibility in applications designed for the AT28HC64B-70JC.

Q: What is the difference between X28HC64JIZ-12 and X28HC64JIZ-12T1?

A: Both parts are electrically identical with 120 ns access time and identical electrical specifications. The difference is packaging format: X28HC64JIZ-12 uses standard packaging, while X28HC64JIZ-12T1 uses Tape & Reel format for high-volume automated assembly. Electrical performance and pin compatibility are identical.

Q: Are the Renesas substitute parts compatible with the original PCB layout?

A: Yes. All substitute parts use the 32-PLCC package with identical footprint dimensions (13.97x11.43mm) and pin configuration. No PCB layout modifications are required.

Q: What is the impact of the slower access time on X28HC64JIZ-12 variants?

A: The 120 ns access time is slower than the original 70 ns specification. This is acceptable for applications where memory access timing is not a critical constraint. For timing-sensitive applications, X28HC64JIZ-90T1 is the preferred substitute.

Q: Do the substitute parts meet current compliance standards?

A: Yes. All Renesas substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The original AT28HC64B-70JC is RoHS non-compliant.

Q: What is the operating temperature range difference?

A: The AT28HC64B-70JC operates from 0°C to 70°C. All Renesas substitutes operate from -40°C to 85°C, providing extended temperature range capability suitable for industrial and automotive applications.

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