AT27C020-12PI Equivalent & Substitute Parts

Part Overview

The AT27C020-12PI is a 2Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 32-DIP package with 120 ns access time. This part is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and new designs. The AT27C020 series remains in production under alternative speed grades, enabling direct substitution where electrical and mechanical parameters align.

Substiute Parts

AT27C020-12PI

Microchip TechnologyIn Stock: 725AT27C020-12PI Datasheet

Current PartRFQ

AT27C020-90PU

Microchip TechnologyIn Stock: 1362AT27C020-90PU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT27C020-12PI is determined by strict equivalence across the following parameters:

• Memory capacity (2Mbit) and organization (256K x 8)
• Parallel interface architecture
• Package form factor (32-DIP, 0.600" pitch)
• Supply voltage range (4.5V ~ 5.5V)
• Operating temperature range (-40°C ~ 85°C)

The AT27C020-90PU qualifies as a direct substitute because it maintains identical memory specifications, package geometry, and electrical operating conditions. The primary difference is access time (90 ns versus 120 ns), which represents improved performance and does not restrict compatibility in applications designed for the 120 ns variant.

Parameter Comparison

Engineering Selection Recommendations

The AT27C020-90PU is the qualified substitute for the AT27C020-12PI based on the following criteria:

• Identical memory capacity, organization, and parallel interface ensure functional compatibility
• Matching package geometry (32-DIP, 0.600" pitch) and through-hole mounting enable direct PCB placement without layout modification
• Equivalent supply voltage and operating temperature ranges maintain system-level electrical compatibility
• Faster access time (90 ns) provides performance margin relative to the original 120 ns specification
• Active product status ensures ongoing availability and supply chain continuity
• ROHS3 compliance of the substitute aligns with modern manufacturing and environmental standards

Frequently Asked Questions (FAQ)

Q: Can the AT27C020-90PU be used as a direct replacement for the AT27C020-12PI?

A: Yes. Both parts share identical memory capacity (2Mbit), organization (256K x 8), parallel interface, package form factor (32-DIP), supply voltage range (4.5V ~ 5.5V), and operating temperature range (-40°C ~ 85°C). The 90 ns access time of the substitute is faster than the original 120 ns specification, ensuring compatibility in all applications designed for the AT27C020-12PI.

Q: What is the significance of the access time difference between 120 ns and 90 ns?

A: Access time defines the maximum delay from address presentation to valid data output. The AT27C020-90PU's 90 ns access time is superior to the AT27C020-12PI's 120 ns specification. This faster performance does not create compatibility issues; systems designed for 120 ns operation will function correctly with the faster 90 ns part.

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

A: No. Both the AT27C020-12PI and AT27C020-90PU use the 32-DIP package with 0.600" (15.24mm) pitch. Pinout and mechanical dimensions are identical, enabling direct PCB substitution without layout changes.

Q: What is the difference in RoHS compliance between these parts?

A: The AT27C020-12PI is RoHS non-compliant, while the AT27C020-90PU is ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the AT27C020-90PU is the appropriate selection.

Q: Why is the AT27C020-12PI classified as obsolete?

A: Microchip Technology has transitioned the AT27C020 product line to active variants with improved specifications and compliance certifications. The AT27C020-90PU represents the current production equivalent within the same memory family.