AT28C64-20JC EEPROM 64Kbit Parallel Memory - Equivalent & Substitute Parts

Part Overview

The AT28C64-20JC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 32-PLCC package with 200 ns access time. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design requirements and production continuity. Substitute parts must maintain electrical compatibility across memory capacity, interface type, supply voltage, and package configuration while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	AT28C64-20JC
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Format	EEPROM
Memory Interface	Parallel
Access Time	200 ns
Voltage Supply	4.5V ~ 5.5V
Package / Case	32-LCC (J-Lead)
Supplier Device Package	32-PLCC (13.97x11.43)
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 70°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the AT28C64-20JC are qualified based on the following mandatory electrical and mechanical parameters:

Memory capacity: 64Kbit (8K x 8 organization)
Memory type: EEPROM, non-volatile
Interface: Parallel
Supply voltage: 4.5V ~ 5.5V
Package: 32-PLCC (13.97x11.43)
Mounting: Surface Mount

Access time and write cycle time are performance characteristics that may vary among substitutes. Parts with equal or faster access times are electrically compatible. Operating temperature range may extend beyond the original specification; parts rated for wider temperature ranges provide enhanced operational flexibility. All identified substitutes maintain the core electrical interface and physical form factor required for direct replacement.

Parameter Comparison

Parameter	AT28C64-20JC	AT28C64B-15JU	X28HC64JIZ-12	X28HC64JIZ-12T1
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	200 ns	150 ns	120 ns	120 ns
Write Cycle Time	1 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
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	32-LCC (J-Lead)	32-LCC (J-Lead)	32-LCC (J-Lead)	32-LCC (J-Lead)
Supplier Device Package	32-PLCC (13.97x11.43)	32-PLCC (13.97x11.43)	32-PLCC (13.97x11.43)	32-PLCC (13.97x11.43)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	2 (1 Year)	2 (1 Year)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

All three substitute parts—AT28C64B-15JU, X28HC64JIZ-12, and X28HC64JIZ-12T1—are active products with current manufacturing status, providing supply chain continuity. The AT28C64B-15JU and both Renesas X28HC64JIZ variants are ROHS3 compliant, meeting modern environmental and regulatory requirements that the obsolete AT28C64-20JC does not satisfy.

The AT28C64B-15JU offers improved access time (150 ns versus 200 ns) while maintaining Microchip Technology manufacturing continuity. The Renesas X28HC64JIZ-12 and X28HC64JIZ-12T1 provide the fastest access time (120 ns) among available substitutes. The X28HC64JIZ-12T1 is supplied in Tape & Reel packaging, suitable for automated assembly processes, while X28HC64JIZ-12 is supplied without specified packaging format.

All substitutes support the extended operating temperature range of -40°C to 85°C, exceeding the original 0°C to 70°C specification. Moisture sensitivity levels are comparable or equivalent across all options.

Frequently Asked Questions (FAQ)

Q: Can AT28C64B-15JU directly replace AT28C64-20JC in existing designs?

A: Yes. Both parts share identical memory capacity (64Kbit), organization (8K x 8), interface (parallel), supply voltage (4.5V ~ 5.5V), and package configuration (32-PLCC). The AT28C64B-15JU provides faster access time (150 ns), which is electrically compatible with designs specified for 200 ns operation.

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

A: Both parts are functionally identical with 120 ns access time and 5 ms write cycle time. The primary difference is packaging: X28HC64JIZ-12T1 is supplied in Tape & Reel format for automated assembly, while X28HC64JIZ-12 packaging format is not specified. Both are ROHS3 compliant and manufactured by Renesas Electronics.

Q: Are there temperature range considerations when substituting?

A: The original AT28C64-20JC operates from 0°C to 70°C. All substitute parts operate from -40°C to 85°C, providing extended temperature coverage. If the application requires operation only within the original 0°C to 70°C range, all substitutes remain fully compatible.

Q: What is the impact of different access times on circuit operation?

A: The AT28C64-20JC specifies 200 ns access time. Substitute parts with equal or faster access times (AT28C64B-15JU at 150 ns, X28HC64JIZ variants at 120 ns) are electrically compatible. Faster access times do not degrade circuit performance; they improve read operation speed.

Q: Are all substitutes RoHS compliant?

A: The original AT28C64-20JC is RoHS non-compliant. All three substitute parts—AT28C64B-15JU, X28HC64JIZ-12, and X28HC64JIZ-12T1—are ROHS3 compliant, meeting current environmental regulations.

Q: What packaging options are available for production?

A: AT28C64B-15JU is supplied in Tube packaging. X28HC64JIZ-12T1 is supplied in Tape & Reel format for automated pick-and-place assembly. X28HC64JIZ-12 packaging format is not specified. All maintain the 32-PLCC (13.97x11.43) physical form factor.

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