AT28HC64B-12JC Equivalent & Substitute Parts

Part Overview

The AT28HC64B-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 equivalent and substitute parts necessary for ongoing system support and new designs. The device operates within a 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 Format	EEPROM
Memory Interface	Parallel
Access Time	120 ns
Write Cycle Time	10 ms
Voltage Supply	4.5V ~ 5.5V
Package Type	32-PLCC (J-Lead)
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 70°C

Substitute Part Grouping Explanation

Substitution for the AT28HC64B-12JC is determined by strict equivalence in the following parameters: 64Kbit memory capacity, 8K x 8 organization, EEPROM technology, parallel interface, 32-PLCC package, and 4.5V to 5.5V supply voltage. Access time and write cycle time variations are permitted within the substitute group, provided the substitute meets or exceeds the performance of the original part. Operating temperature range differences are acceptable based on application requirements. All substitute parts maintain identical memory architecture and pinout compatibility.

Parameter Comparison

Parameter	AT28HC64B-12JC (Main)	AT28HC64B-12JU	X28HC64JIZ-12	X28HC64JIZ-90T1
Manufacturer	Microchip Technology	Microchip Technology	Renesas Electronics	Renesas Electronics
Memory Size	64Kbit	64Kbit	64Kbit	64Kbit
Memory Organization	8K x 8	8K x 8	8K x 8	8K x 8
Memory Format	EEPROM	EEPROM	EEPROM	EEPROM
Memory Interface	Parallel	Parallel	Parallel	Parallel
Access Time	120 ns	120 ns	120 ns	90 ns
Write Cycle Time	10 ms	10 ms	5 ms	5 ms
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Package Type	32-PLCC (J-Lead)	32-PLCC (J-Lead)	32-PLCC (J-Lead)	32-PLCC (J-Lead)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
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

AT28HC64B-12JU is a direct substitute from Microchip Technology with identical electrical specifications and package configuration. This part is active in production and ROHS3 compliant, making it suitable for applications requiring Microchip sourcing continuity.

X28HC64JIZ-12 from Renesas Electronics Corporation provides equivalent functionality with improved write cycle time (5 ms versus 10 ms) and extended operating temperature range (-40°C to 85°C). This part is active and ROHS3 compliant.

X28HC64JIZ-90T1 is the manufacturer-recommended substitute from Renesas Electronics Corporation, offering the fastest access time (90 ns) and improved write cycle time (5 ms). This part is supplied in Tape & Reel packaging, active in production, and ROHS3 compliant. The extended operating temperature range supports applications requiring wider thermal operation.

All substitute parts maintain pinout compatibility and identical memory architecture with the AT28HC64B-12JC. Selection should be based on sourcing availability, compliance requirements, and thermal operating range needs.

Frequently Asked Questions (FAQ)

Q: Can AT28HC64B-12JU replace AT28HC64B-12JC directly? A: Yes. AT28HC64B-12JU is a direct substitute with identical memory capacity, organization, access time, write cycle time, supply voltage, and 32-PLCC package. The primary difference is product status (active versus obsolete) and RoHS compliance.

Q: What are the performance differences between Microchip and Renesas substitutes? A: Renesas parts (X28HC64JIZ-12 and X28HC64JIZ-90T1) offer faster write cycle time (5 ms versus 10 ms). X28HC64JIZ-90T1 additionally provides faster access time (90 ns versus 120 ns). Both Renesas parts support extended operating temperature range (-40°C to 85°C versus 0°C to 70°C).

Q: Are all substitute parts in the same package? A: Yes. All substitute parts use the 32-PLCC (J-Lead) package with identical pinout and mounting type (surface mount). Package dimensions are 13.97 x 11.43 mm across all parts.

Q: What is the difference between X28HC64JIZ-12 and X28HC64JIZ-90T1? A: Both parts are from Renesas Electronics Corporation with identical memory specifications and supply voltage. X28HC64JIZ-90T1 provides faster access time (90 ns versus 120 ns) and is supplied in Tape & Reel packaging. X28HC64JIZ-12 is supplied without specified packaging format.

Q: Are all substitute parts RoHS compliant? A: Yes. All substitute parts (AT28HC64B-12JU, X28HC64JIZ-12, and X28HC64JIZ-90T1) are ROHS3 compliant. The original AT28HC64B-12JC is RoHS non-compliant.

Q: Can these parts be used in applications requiring 0°C to 70°C operation only? A: Yes. All substitute parts support the 0°C to 70°C operating range. Substitute parts with extended temperature ranges (-40°C to 85°C) are backward compatible with narrower temperature requirements.

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