AT27C1024-15PC Equivalent & Substitute Parts

Part Overview

The AT27C1024-15PC 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, making substitute components necessary for new designs or system replacements. The AT27C1024 series shares a common base product number across multiple speed grades and operating temperature ranges, enabling direct functional substitution where electrical and mechanical parameters align.

Substiute Parts

AT27C1024-15PC

Microchip TechnologyIn Stock: 4184AT27C1024-15PC Datasheet

Current PartRFQ

AT27C1024-70PU

Microchip TechnologyIn Stock: 5401AT27C1024-70PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT27C1024-15PC is determined by the following criteria:

Mandatory Compatibility Parameters:

• Memory capacity: 1Mbit
• Memory organization: 64K x 16
• Memory interface: Parallel
• Package type: 40-DIP (0.600", 15.24mm)
• Mounting type: Through Hole
• Supply voltage range: 4.5V ~ 5.5V

Variable Parameters Allowing Substitution:

• Access time: Faster access times (lower ns values) are functionally compatible
• Operating temperature range: Extended ranges are compatible with the original specification
• Product status: Active parts substitute for obsolete parts
• RoHS compliance: Newer compliance standards are acceptable

The AT27C1024-70PU qualifies as a direct substitute because it maintains all mandatory compatibility parameters while offering improved performance characteristics (70 ns access time versus 150 ns) and extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C).

Parameter Comparison

Engineering Selection Recommendations

The AT27C1024-70PU is the qualified substitute for the AT27C1024-15PC based on the following factors:

Product Status: The AT27C1024-15PC is obsolete, while the AT27C1024-70PU maintains active product status with current manufacturing availability.

Compliance: The AT27C1024-70PU meets ROHS3 compliance standards, whereas the original part is non-compliant. This is relevant for applications subject to RoHS regulations.

Performance Improvement: The substitute part provides faster access time (70 ns versus 150 ns), which is a performance enhancement that does not compromise system compatibility.

Temperature Range: The extended operating temperature range (-40°C ~ 85°C) of the substitute part encompasses the original specification (0°C ~ 70°C), ensuring compatibility across all intended operating conditions of the original design.

Electrical and Mechanical Compatibility: Both parts share identical supply voltage requirements, memory capacity, organization, interface type, and physical package dimensions, ensuring direct pin-for-pin compatibility.

Frequently Asked Questions (FAQ)

Q: Can AT27C1024-70PU directly replace AT27C1024-15PC in existing designs?

A: Yes. Both parts are pin-for-pin compatible with identical package dimensions (40-DIP), supply voltage requirements (4.5V ~ 5.5V), memory capacity (1Mbit), and parallel interface configuration. The substitute part can be installed without circuit modifications.

Q: What is the significance of the access time difference (150 ns vs. 70 ns)?

A: Access time defines the maximum delay from address input to data output. The AT27C1024-70PU's faster access time (70 ns) is a performance improvement that maintains backward compatibility with systems designed for the slower 150 ns specification.

Q: Does the extended operating temperature range of the substitute part affect compatibility?

A: No. The AT27C1024-70PU's operating range (-40°C ~ 85°C) fully encompasses the original part's range (0°C ~ 70°C). Systems designed for the original temperature specification will operate within the substitute part's qualified range.

Q: Are there packaging differences between these parts?

A: Both parts use 40-DIP (0.600", 15.24mm) through-hole packages. The AT27C1024-70PU is supplied in tube packaging, while the original part packaging is not specified. This does not affect electrical or mechanical compatibility.

Q: Why is RoHS compliance relevant for this substitution?

A: RoHS compliance indicates adherence to restrictions on hazardous substances. The AT27C1024-70PU's ROHS3 compliance is advantageous for applications subject to RoHS regulations or for long-term supply chain sustainability, though it does not affect functional compatibility.

Q: Is the AT27C1024-70PU the only available substitute?

A: Based on the provided data, AT27C1024-70PU is the documented substitute. The AT27C1024 series includes other speed grades; however, only parts meeting all mandatory compatibility parameters qualify as direct substitutes.