AT27C010-90JC Equivalent & Substitute Parts

Part Overview

The AT27C010-90JC is a 1Mbit EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 32-PLCC package. This device operates with a 90 ns access time and is designed for parallel memory applications requiring non-volatile storage. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance, repair, and legacy product support.

Substiute Parts

AT27C010-90JC

Microchip TechnologyIn Stock: 18041AT27C010-90JC Datasheet

Current PartRFQ

AT27C010-70JU

Microchip TechnologyIn Stock: 2331AT27C010-70JU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT27C010-90JC is determined by the following critical parameters:

• Memory Capacity & Organization: Must be 1Mbit with 128K x 8 organization to maintain address and data bus compatibility
• Memory Interface: Must be parallel to ensure pin-level compatibility
• Package Type: Must be 32-PLCC (J-Lead) for mechanical and electrical socket compatibility
• Voltage Supply Range: Must support 4.5V ~ 5.5V operation
• Access Time: Substitute parts with equal or faster access times (≤90 ns) are functionally compatible
• Mounting Type: Must be Surface Mount for PCB integration compatibility

The AT27C010-70JU qualifies as a direct substitute based on these parameters. It maintains identical memory capacity, organization, interface, package, and voltage specifications while offering improved access time (70 ns vs. 90 ns) and extended operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

The AT27C010-70JU is the qualified substitute for the AT27C010-90JC based on the following engineering criteria:

• Functional Equivalence: Identical memory capacity, organization, and parallel interface ensure direct functional replacement without circuit modification
• Pin Compatibility: Both devices use the 32-PLCC package with identical pinout, enabling direct socket substitution
• Performance Enhancement: The 70 ns access time of the substitute meets or exceeds the timing requirements of the original 90 ns part
• Product Status: The substitute is in active production status, ensuring long-term availability and supply chain reliability
• Compliance Improvement: The AT27C010-70JU meets ROHS3 compliance standards, whereas the original part is RoHS non-compliant
• Temperature Range: The extended operating temperature range (-40°C ~ 85°C) of the substitute provides greater operational flexibility compared to the original (0°C ~ 70°C)

Frequently Asked Questions (FAQ)

Q: Can the AT27C010-70JU be used as a direct replacement for the AT27C010-90JC?

A: Yes. Both devices share identical memory capacity (1Mbit), organization (128K x 8), parallel interface, 32-PLCC package, and voltage supply range (4.5V ~ 5.5V). The substitute offers faster access time (70 ns vs. 90 ns), making it functionally compatible without circuit modifications.

Q: What is the significance of the access time difference between 90 ns and 70 ns?

A: Access time defines the maximum delay from address input to valid data output. The 70 ns substitute is faster, meaning it meets the timing requirements of the original 90 ns part. Faster access times do not create compatibility issues in systems designed for the slower part.

Q: Are there any package or pinout differences between these parts?

A: No. Both the AT27C010-90JC and AT27C010-70JU use the 32-PLCC (J-Lead) package with identical pinout and mechanical dimensions (13.97 x 11.43 mm). Direct socket substitution is possible.

Q: Why is the original part listed as obsolete?

A: The AT27C010-90JC is classified as obsolete, indicating it is no longer in active production. The AT27C010-70JU, which is in active production status, serves as the current equivalent for new designs and legacy system support.

Q: Does the RoHS compliance difference affect substitution?

A: RoHS compliance is a regulatory and environmental consideration. The AT27C010-70JU meets ROHS3 standards, providing improved environmental compliance compared to the non-compliant original part. This does not affect electrical or functional compatibility.

Q: What is the difference in operating temperature ranges?

A: The original part operates from 0°C to 70°C, while the substitute operates from -40°C to 85°C. The substitute's extended range provides greater flexibility for applications requiring operation in wider temperature environments.