AT27C1024-15JC Equivalent & Substitute Parts

Part Overview

The AT27C1024-15JC is a 1Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 44-PLCC surface mount package. This device is classified as obsolete and operates with a 150 ns access time across a 0°C to 70°C temperature range. Due to its obsolete status and non-compliance with current RoHS standards, identifying functionally compatible alternatives is essential for ongoing system support and new design implementations.

Substiute Parts

AT27C1024-15JC

Microchip TechnologyIn Stock: 2366AT27C1024-15JC Datasheet

Current PartRFQ

AT27C1024-70JU

Microchip TechnologyIn Stock: 1467AT27C1024-70JU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT27C1024-15JC is determined by the following critical parameters:

• Memory Capacity & Organization: Must be 1Mbit with 64K x 16 organization to maintain pin-for-pin compatibility and functional equivalence
• Memory Interface: Must support parallel interface architecture
• Package & Pinout: Must use 44-PLCC (J-Lead) surface mount package to ensure mechanical and electrical compatibility
• Voltage Supply Range: Must operate within 4.5V to 5.5V to function in existing circuits
• Access Time: Substitute parts with equal or faster access times are functionally compatible; slower access times are not acceptable

The AT27C1024-70JU meets all substitution criteria while offering improved specifications in access time, operating temperature range, and compliance status.

Parameter Comparison

Engineering Selection Recommendations

The AT27C1024-70JU is a direct functional substitute for the AT27C1024-15JC. Selection should be based on the following factors:

For Obsolescence Management: The AT27C1024-70JU carries Active product status, ensuring continued availability and supply chain stability compared to the Obsolete AT27C1024-15JC.

For Compliance Requirements: The AT27C1024-70JU is ROHS3 compliant, meeting current regulatory standards. The AT27C1024-15JC is non-compliant and unsuitable for new designs or systems requiring RoHS certification.

For Performance: The AT27C1024-70JU provides superior access time (70 ns versus 150 ns) and an extended operating temperature range (-40°C to 85°C versus 0°C to 70°C), enabling deployment in broader environmental conditions.

For Programmability: The AT27C1024-70JU is verified as programmable through DiGi-Electronics, whereas the AT27C1024-15JC programmability status is not verified.

Frequently Asked Questions (FAQ)

Q: Can the AT27C1024-70JU be used as a direct replacement for the AT27C1024-15JC?

A: Yes. Both devices share identical memory capacity (1Mbit), organization (64K x 16), parallel interface, voltage supply range (4.5V ~ 5.5V), and 44-PLCC package. The AT27C1024-70JU is pin-for-pin compatible and functionally equivalent.

Q: What is the difference in access time between these parts?

A: The AT27C1024-15JC has 150 ns access time, while the AT27C1024-70JU has 70 ns access time. The faster access time of the substitute part is compatible with circuits designed for the original part.

Q: Are there any temperature range considerations?

A: The AT27C1024-15JC operates from 0°C to 70°C, while the AT27C1024-70JU operates from -40°C to 85°C. The extended range of the substitute part provides greater flexibility for industrial and extended-temperature applications.

Q: What is the packaging difference?

A: Both parts use identical 44-PLCC (J-Lead) surface mount packaging with dimensions of 16.6x16.6 mm. No PCB layout modifications are required for substitution.

Q: Why is RoHS compliance important for this substitution?

A: The AT27C1024-15JC is RoHS non-compliant, while the AT27C1024-70JU is ROHS3 compliant. For new designs, systems requiring regulatory certification, or procurement in regions with RoHS mandates, the compliant substitute is necessary.

Q: What is the moisture sensitivity difference?

A: The AT27C1024-15JC has MSL 2 (1 Year shelf life), while the AT27C1024-70JU has MSL 3 (168 Hours shelf life). Shorter MSL requires more careful handling and storage protocols during manufacturing and assembly.