AT27C020-90PC EPROM Equivalent & Substitute Parts

Part Overview

The AT27C020-90PC is a 2Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 32-DIP package with 90 ns access time. This part is classified as obsolete and is no longer in active production. Finding equivalent substitute parts is necessary due to discontinued status and limited remaining inventory. The AT27C020-90PU serves as the direct functional equivalent with improved product status and compliance certifications.

Substiute Parts

AT27C020-90PC

Microchip TechnologyIn Stock: 1890AT27C020-90PC Datasheet

Current PartRFQ

AT27C020-90PU

Microchip TechnologyIn Stock: 1362AT27C020-90PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT27C020-90PC is determined by the following critical parameters that must remain constant:

• Memory capacity: 2Mbit
• Memory organization: 256K x 8 configuration
• Interface type: Parallel
• Access time: 90 ns
• Supply voltage range: 4.5V ~ 5.5V
• Package: 32-DIP form factor
• Mounting: Through Hole

The AT27C020-90PU meets all these requirements identically. The primary differences between the main part and substitute are product status (active vs. obsolete), operating temperature range, packaging format (tube vs. standard), RoHS compliance level, and programmability verification status.

Parameter Comparison

Engineering Selection Recommendations

The AT27C020-90PU is the appropriate substitute for the AT27C020-90PC based on the following factors:

• Identical electrical and mechanical specifications for all critical parameters
• Active product status ensures continued availability and supply chain reliability
• ROHS3 compliance meets current environmental and regulatory standards
• Verified programmability status provides assurance for production environments
• Extended operating temperature range (-40°C ~ 85°C) provides broader application flexibility compared to the obsolete part (0°C ~ 70°C)
• Both parts share the same base product number (AT27C020) and are manufactured by the same supplier

Selection of the AT27C020-90PU eliminates obsolescence risk while maintaining full functional compatibility with existing designs using the AT27C020-90PC.

Frequently Asked Questions (FAQ)

Q: Can the AT27C020-90PU directly replace the AT27C020-90PC in existing applications?

A: Yes. Both parts are electrically and mechanically identical across all functional parameters including memory capacity, access time, voltage supply, and 32-DIP package configuration. The substitute operates within the same electrical specifications required by the original design.

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

A: The AT27C020-90PC operates from 0°C to 70°C, while the AT27C020-90PU operates from -40°C to 85°C. The substitute provides a wider temperature envelope, making it suitable for applications requiring extended temperature performance.

Q: Does the AT27C020-90PU meet RoHS compliance requirements?

A: Yes. The AT27C020-90PU is ROHS3 compliant, whereas the obsolete AT27C020-90PC is RoHS non-compliant. This makes the substitute suitable for applications and markets requiring RoHS certification.

Q: Are there packaging differences between the two parts?

A: The AT27C020-90PC is supplied in standard packaging, while the AT27C020-90PU is supplied in tube packaging. Both use identical 32-DIP form factors and are through-hole mounted. Packaging format does not affect electrical or mechanical compatibility.

Q: What does "Verified Programmability" mean for the AT27C020-90PU?

A: Verified programmability indicates that the AT27C020-90PU has been tested and confirmed to support standard EPROM programming procedures. The AT27C020-90PC shows "Not Verified" status, meaning programmability confirmation is not documented.