AT27C010-70JC EPROM Equivalent & Substitute Parts

Part Overview

The AT27C010-70JC is a 1Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 32-PLCC surface mount package. This device operates at 70 ns access time with a supply voltage range of 4.5V to 5.5V and is designed for applications requiring non-volatile memory storage with parallel interface architecture.

The AT27C010-70JC carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support legacy system maintenance or redesigns requiring compatible memory solutions.

Key Parameters

Parameter	Value
Memory Size	1Mbit
Memory Organization	128K x 8
Memory Format	EPROM
Memory Interface	Parallel
Access Time	70 ns
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 eligibility for the AT27C010-70JC is determined by the following critical parameters:

Memory Capacity & Organization: Substitute parts must maintain 1Mbit capacity with 128K x 8 organization to ensure address and data line compatibility
Package & Pinout: All substitutes must use 32-PLCC (J-Lead) surface mount packaging to guarantee PCB footprint and socket compatibility
Memory Interface: Parallel interface architecture must be preserved for signal compatibility with existing system designs
Voltage Supply Range: Operating voltage must encompass or match the 4.5V ~ 5.5V specification to ensure proper circuit operation
Access Time: The 70 ns access time establishes the maximum allowable timing specification; substitutes with equal or faster access times are compatible

The AT27C010-70JU qualifies as a direct substitute, sharing identical electrical and mechanical specifications while offering improved product status and compliance certifications.

Parameter Comparison

Parameter	AT27C010-70JC	AT27C010-70JU
Manufacturer	Microchip Technology	Microchip Technology
Memory Size	1Mbit	1Mbit
Memory Organization	128K x 8	128K x 8
Memory Format	EPROM	EPROM
Memory Interface	Parallel	Parallel
Access Time	70 ns	70 ns
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Package Type	32-PLCC (J-Lead)	32-PLCC (J-Lead)
Mounting Type	Surface Mount	Surface Mount
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Packaging	Not specified	Tube

Engineering Selection Recommendations

The AT27C010-70JU is the primary substitute for the AT27C010-70JC. Both devices share identical core electrical specifications and package geometry, ensuring direct compatibility in existing circuit designs.

The AT27C010-70JU offers two significant advantages over the original part:

Active Product Status: The AT27C010-70JU maintains active manufacturing status, providing reliable long-term availability and supply chain continuity compared to the obsolete AT27C010-70JC
Regulatory Compliance: The AT27C010-70JU achieves ROHS3 compliance, meeting current environmental and regulatory requirements, whereas the AT27C010-70JC is non-compliant

The extended operating temperature range of the AT27C010-70JU (-40°C ~ 85°C versus 0°C ~ 70°C) provides additional thermal margin for applications operating in wider environmental conditions.

Frequently Asked Questions (FAQ)

Q: Can the AT27C010-70JU replace the AT27C010-70JC in existing designs without modification?

A: Yes. Both devices share identical memory capacity (1Mbit), organization (128K x 8), access time (70 ns), supply voltage (4.5V ~ 5.5V), and 32-PLCC package geometry. Direct substitution is electrically and mechanically compatible.

Q: What is the difference in operating temperature range between these parts?

A: The AT27C010-70JC operates from 0°C to 70°C, while the AT27C010-70JU operates from -40°C to 85°C. The extended range of the AT27C010-70JU accommodates applications requiring operation in wider environmental conditions.

Q: Why is RoHS compliance important for this substitution?

A: The AT27C010-70JU is ROHS3 compliant, meeting current environmental regulations for lead-free and restricted substance requirements. The AT27C010-70JC is non-compliant. For new designs or systems subject to regulatory requirements, the compliant substitute is necessary.

Q: Are there any pinout differences between the AT27C010-70JC and AT27C010-70JU?

A: No. Both devices use the 32-PLCC (J-Lead) package with identical pinout and signal assignments. PCB footprints and socket compatibility are preserved.

Q: What packaging formats are available for the substitute part?

A: The AT27C010-70JU is supplied in Tube packaging. Verify packaging requirements for your procurement and assembly processes.

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