AT27C1024-12PC Equivalent & Substitute Parts

Part Overview

The AT27C1024-12PC is a 1Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 40-DIP package. This part is classified as obsolete and operates with a 120 ns access time across a 0°C to 70°C temperature range. Due to its obsolete status and limited operating temperature range, equivalent substitute parts with improved specifications and active product status are available to support system design and replacement requirements.

Substiute Parts

AT27C1024-12PC

Microchip TechnologyIn Stock: 1782AT27C1024-12PC Datasheet

Current PartRFQ

AT27C1024-70PU

Microchip TechnologyIn Stock: 5401AT27C1024-70PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT27C1024-12PC is determined by strict equivalence across the following parameters:

• Memory Capacity & Organization: 1Mbit capacity with 64K x 16 organization
• Interface Type: Parallel interface configuration
• Package & Mounting: 40-DIP through-hole package (0.600", 15.24mm)
• Supply Voltage: 4.5V ~ 5.5V compatibility
• Access Time: Equal or faster performance (≤120 ns)

The AT27C1024-70PU meets all substitution criteria with identical memory specifications, package configuration, and voltage requirements. The substitute part offers improved access time (70 ns versus 120 ns) and extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C), making it suitable for replacement in applications requiring the AT27C1024-12PC.

Parameter Comparison

Engineering Selection Recommendations

The AT27C1024-70PU is a direct functional substitute for the AT27C1024-12PC. Selection should be based on the following factors:

Product Status: The AT27C1024-12PC is obsolete, while the AT27C1024-70PU maintains active product status with confirmed availability. For new designs or long-term production requirements, the AT27C1024-70PU is the appropriate choice.

Compliance Requirements: The AT27C1024-70PU is ROHS3 compliant, whereas the AT27C1024-12PC is non-compliant. Applications subject to RoHS regulations require the substitute part.

Performance Characteristics: The AT27C1024-70PU provides faster access time (70 ns) compared to the original part (120 ns), with no performance degradation. The extended operating temperature range (-40°C ~ 85°C) accommodates broader environmental conditions than the original specification (0°C ~ 70°C).

Pin Compatibility: Both parts use identical 40-DIP through-hole packaging with matching pinout, enabling direct socket substitution without circuit board modifications.

Frequently Asked Questions (FAQ)

Q: Can the AT27C1024-70PU be used as a direct replacement for the AT27C1024-12PC?

A: Yes. Both parts share identical memory capacity (1Mbit), organization (64K x 16), parallel interface, supply voltage (4.5V ~ 5.5V), and 40-DIP package configuration. The substitute part offers improved access time and extended temperature range with no functional limitations.

Q: What is the primary difference between these two parts?

A: The AT27C1024-70PU has faster access time (70 ns versus 120 ns) and operates across a wider temperature range (-40°C ~ 85°C versus 0°C ~ 70°C). The substitute part is also ROHS3 compliant and maintains active product status.

Q: Are there any circuit board modifications required for substitution?

A: No. Both parts use the 40-DIP through-hole package with identical pinout and footprint. Direct socket substitution is possible without PCB changes.

Q: Why is the AT27C1024-12PC listed as obsolete?

A: The AT27C1024-12PC has reached end-of-life status with Microchip Technology. The AT27C1024-70PU represents the current active equivalent in the AT27C1024 product family.

Q: Does the faster access time of the AT27C1024-70PU affect system compatibility?

A: No. Faster access time is a performance improvement that maintains backward compatibility. Systems designed for 120 ns operation function correctly with 70 ns parts.

Q: What compliance certifications apply to each part?

A: The AT27C1024-12PC is RoHS non-compliant. The AT27C1024-70PU is ROHS3 compliant. Both parts are REACH unaffected and classified under HTSUS code 8542.32.0061.