AT28HC256E-90JC Equivalent & Substitute Parts

Part Overview

The AT28HC256E-90JC is a 256Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 32-PLCC package with 90 ns access time. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. The device operates within the 4.5V to 5.5V supply range and supports 32K x 8 memory organization with parallel interface architecture.

Key Parameters

Parameter	Value
Memory Size	256Kbit
Memory Organization	32K x 8
Memory Interface	Parallel
Access Time	90 ns
Write Cycle Time	10 ms
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 eligibility for the AT28HC256E-90JC is determined by strict alignment of the following parameters: memory size (256Kbit), memory organization (32K x 8), parallel interface, package type (32-PLCC), supply voltage range (4.5V ~ 5.5V), and mounting type (surface mount). Access time and write cycle time may vary within acceptable operational margins. Parts are grouped by manufacturer and product status to facilitate selection based on availability and compliance requirements.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Access Time (ns)	Write Cycle Time (ms)	Operating Temp (°C)	Product Status	RoHS Status	Packaging
AT28HC256E-90JC	Microchip Technology	256Kbit	90	10	0 ~ 70	Obsolete	RoHS non-compliant	Tube
AT28HC256E-90JU	Microchip Technology	256Kbit	90	10	-40 ~ 85	Active	ROHS3 Compliant	Tube
AT28HC256F-12JC	Microchip Technology	256Kbit	120	3	0 ~ 70	Active	RoHS non-compliant	Tube
X28HC256JIZ-90T1	Renesas Electronics	256Kbit	90	5	-40 ~ 85	Active	ROHS3 Compliant	Tape & Reel
X28HC256JIZ-15T1	Renesas Electronics	256Kbit	150	5	-40 ~ 85	Active	ROHS3 Compliant	Tape & Reel
X28HC256JZ-15T1	Renesas Electronics	256Kbit	150	5	0 ~ 70	Active	ROHS3 Compliant	Tape & Reel

Engineering Selection Recommendations

For applications requiring direct electrical and thermal equivalence with identical access time (90 ns), AT28HC256E-90JU is the primary substitute. This part maintains Microchip Technology manufacturing continuity, operates at the same access speed, and holds active product status with ROHS3 compliance.

For extended temperature range operation (-40°C to 85°C), both X28HC256JIZ-90T1 (90 ns access) and AT28HC256E-90JU provide suitable alternatives with active status and RoHS compliance.

For applications where slower access time (120-150 ns) is acceptable, AT28HC256F-12JC, X28HC256JIZ-15T1, and X28HC256JZ-15T1 are available. AT28HC256F-12JC maintains the 0°C to 70°C temperature range but remains RoHS non-compliant. Renesas parts (X28HC256JIZ-15T1 and X28HC256JZ-15T1) provide RoHS3 compliance with extended or standard temperature ranges respectively.

Frequently Asked Questions (FAQ)

Q: Can AT28HC256E-90JU directly replace AT28HC256E-90JC?

A: Yes. Both parts share identical memory size (256Kbit), organization (32K x 8), parallel interface, package type (32-PLCC), supply voltage (4.5V ~ 5.5V), and access time (90 ns). AT28HC256E-90JU is active status with extended temperature range (-40°C to 85°C) and ROHS3 compliance.

Q: What is the difference between Microchip and Renesas substitute options?

A: Microchip AT28HC256E-90JU maintains manufacturer continuity with identical 90 ns access time. Renesas X28HC256JIZ-90T1 also provides 90 ns access with extended temperature range and RoHS compliance. Both are electrically equivalent for the 32-PLCC package.

Q: Are slower access time parts (120-150 ns) compatible?

A: Slower access time parts are compatible only if system timing margins permit. AT28HC256F-12JC (120 ns) and X28HC256JIZ-15T1 / X28HC256JZ-15T1 (150 ns) maintain all other critical parameters but require timing verification in the target application.

Q: What packaging differences exist among substitutes?

A: AT28HC256E-90JC and AT28HC256E-90JU are supplied in Tube packaging. Renesas parts (X28HC256JIZ-90T1, X28HC256JIZ-15T1, X28HC256JZ-15T1) are supplied in Tape & Reel format. Both packaging types are compatible with standard PCB assembly processes.

Q: Which substitute offers the best compliance profile?

A: AT28HC256E-90JU and all Renesas parts (X28HC256JIZ-90T1, X28HC256JIZ-15T1, X28HC256JZ-15T1) hold ROHS3 compliance. AT28HC256F-12JC remains RoHS non-compliant. For new designs requiring RoHS compliance, AT28HC256E-90JU or Renesas equivalents are required.

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