AT27C020-90JI EPROM Equivalent & Substitute Parts

Part Overview

The AT27C020-90JI is a 2Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 32-PLCC surface mount package. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design support and procurement. The AT27C020-90JI operates with a 90 ns access time and supports standard 5V logic levels, making it suitable for legacy embedded systems and industrial applications requiring non-volatile memory storage.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EPROM
Memory Size	2Mbit
Memory Organization	256K x 8
Memory Interface	Parallel
Access Time	90 ns
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	32-PLCC (J-Lead)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AT27C020-90JI is determined by strict equivalence across the following critical parameters:

Memory capacity (2Mbit) and organization (256K x 8)
Parallel interface architecture
Access time specification (90 ns)
Supply voltage range (4.5V ~ 5.5V)
Operating temperature range (-40°C ~ 85°C)
Package form factor (32-PLCC with J-Lead configuration)
Mounting technology (Surface Mount)

The AT27C020-90JU meets all these criteria as a direct functional equivalent. Both parts share the same base product number (AT27C020) and identical electrical and mechanical specifications. The primary distinction is product status and compliance certification.

Parameter Comparison

Parameter	AT27C020-90JI	AT27C020-90JU
Manufacturer	Microchip Technology	Microchip Technology
Memory Size	2Mbit	2Mbit
Memory Organization	256K x 8	256K x 8
Access Time	90 ns	90 ns
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	32-LCC (J-Lead)	32-LCC (J-Lead)
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	Non-compliant	ROHS3 Compliant
Packaging	Not specified	Tube

Engineering Selection Recommendations

The AT27C020-90JU is the direct active equivalent for the obsolete AT27C020-90JI. Selection of the AT27C020-90JU is supported by:

Identical electrical specifications across all memory, timing, and voltage parameters
Matching mechanical package configuration (32-PLCC J-Lead)
Active product status ensuring continued availability and supply chain support
ROHS3 compliance certification, meeting modern environmental and regulatory requirements
Verified programmability status through DiGi-Electronics

For applications requiring the AT27C020-90JI, the AT27C020-90JU provides full functional compatibility without design modification.

Frequently Asked Questions (FAQ)

Q: Can the AT27C020-90JU directly replace the AT27C020-90JI without PCB modifications?

A: Yes. Both parts share identical pinouts, package dimensions (32-PLCC with 13.97x11.43mm footprint), and electrical specifications. No PCB layout changes are required.

Q: What is the difference between the -JI and -JU suffix designations?

A: The suffix indicates packaging and compliance variations. The -JI designation is obsolete, while -JU is active. Both use the same die and core specifications.

Q: Is the AT27C020-90JU suitable for new designs?

A: Yes. The AT27C020-90JU carries active product status and ROHS3 compliance, making it appropriate for new development and production applications.

Q: Are there any timing or performance differences between these parts?

A: No. Both parts specify 90 ns access time and identical voltage/temperature operating ranges.

Q: What packaging options are available for the AT27C020-90JU?

A: The AT27C020-90JU is supplied in Tube packaging. Verify packaging requirements for your procurement process.

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