AT28C64-15JC EEPROM 64Kbit Parallel Memory - Equivalent & Substitute Parts

Part Overview

The AT28C64-15JC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 32-PLCC package with 150 ns access time. This part is classified as obsolete, making equivalent substitutes necessary for ongoing system support and new designs. The AT28C64-15JC 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 Format	EEPROM
Memory Interface	Parallel
Access Time	150 ns
Write Cycle Time	1 ms
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	32-PLCC (J-Lead)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the AT28C64-15JC is determined by strict alignment of the following electrical and mechanical parameters:

Critical Compatibility Parameters:

Memory capacity: 64Kbit
Memory organization: 8K x 8
Memory format: EEPROM (non-volatile)
Memory interface: Parallel
Package type: 32-PLCC (J-Lead)
Supply voltage range: 4.5V ~ 5.5V (minimum overlap required)
Mounting type: Surface Mount

Performance Parameters (Access Time & Write Cycle Time): Substitute parts must meet or exceed the performance specifications of the original part. Access time of 150 ns or faster and write cycle time of 1 ms or faster are acceptable.

Identified Substitute Parts:

AT28C64B-15JU (Microchip Technology) - Active product status with extended operating temperature range and RoHS3 compliance
X28HC64JIZ-12 (Renesas Electronics Corporation) - Active product with improved access time (120 ns) and RoHS3 compliance
X28HC64JIZ-12T1 (Renesas Electronics Corporation) - Active product in Tape & Reel packaging with identical electrical specifications to X28HC64JIZ-12

Parameter Comparison

Parameter	AT28C64-15JC (Main)	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
Access Time	150 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 Type	32-PLCC (J-Lead)	32-PLCC (J-Lead)	32-PLCC (J-Lead)	32-PLCC (J-Lead)
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	RoHS3 Compliant	RoHS3 Compliant	RoHS3 Compliant

Engineering Selection Recommendations

AT28C64B-15JU Selection Criteria: This Microchip Technology part maintains manufacturer continuity and is the direct active-product successor to the AT28C64-15JC. It provides identical electrical performance with extended operating temperature range (-40°C to 85°C versus 0°C to 70°C) and achieves RoHS3 compliance. The part is available in high inventory (16,704 units) and is verified as programmable. Write cycle time increases to 10 ms, which is acceptable for most legacy system replacements.

X28HC64JIZ-12 / X28HC64JIZ-12T1 Selection Criteria: These Renesas Electronics parts offer superior access time performance (120 ns versus 150 ns) and are available in active product status with RoHS3 compliance. The X28HC64JIZ-12T1 variant provides Tape & Reel packaging for automated assembly environments. Both parts support the extended operating temperature range and meet all electrical compatibility requirements. Write cycle time of 5 ms represents a middle ground between the original specification and the AT28C64B-15JU.

Compliance Consideration: All three substitute parts achieve RoHS3 compliance, whereas the original AT28C64-15JC is non-compliant. This is a significant advantage for new designs and systems subject to environmental regulations.

Frequently Asked Questions (FAQ)

Q: Can AT28C64B-15JU directly replace AT28C64-15JC in existing designs? A: Yes. Both parts share identical memory capacity (64Kbit), organization (8K x 8), parallel interface, supply voltage range (4.5V ~ 5.5V), and 32-PLCC package. The AT28C64B-15JU extends the operating temperature range and improves compliance status without requiring circuit modifications.

Q: What is the difference between X28HC64JIZ-12 and X28HC64JIZ-12T1? A: Both parts are electrically identical with 120 ns access time and 5 ms write cycle time. The primary difference is packaging: X28HC64JIZ-12 is supplied in standard packaging, while X28HC64JIZ-12T1 is supplied in Tape & Reel format for automated pick-and-place assembly.

Q: Does the increased write cycle time of AT28C64B-15JU (10 ms vs. 1 ms) affect system compatibility? A: Write cycle time affects only the duration of write operations. If the original design does not depend on the 1 ms specification for timing-critical operations, the 10 ms write cycle is functionally compatible. System-level timing analysis is required to confirm compatibility.

Q: Are all substitute parts RoHS compliant? A: Yes. AT28C64B-15JU, X28HC64JIZ-12, and X28HC64JIZ-12T1 all achieve RoHS3 compliance, whereas the original AT28C64-15JC is non-compliant.

Q: Which substitute part offers the best performance? A: X28HC64JIZ-12 and X28HC64JIZ-12T1 provide the fastest access time (120 ns) and intermediate write cycle time (5 ms). These parts are suitable for performance-sensitive applications within the specified operating temperature range.

Q: Can these parts be used in new designs? A: Yes. All three substitute parts carry active product status and are available in production quantities, making them suitable for new designs. AT28C64B-15JU maintains Microchip Technology continuity, while X28HC64JIZ-12 and X28HC64JIZ-12T1 provide alternative sourcing from Renesas Electronics.

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