AT27C020-15PI Equivalent & Substitute Parts

Part Overview

The AT27C020-15PI is a 2Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 32-DIP package with 150 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 provides non-volatile memory storage suitable for embedded systems requiring parallel interface memory solutions.

Substiute Parts

AT27C020-15PI

Microchip TechnologyIn Stock: 1373AT27C020-15PI Datasheet

Current PartRFQ

AT27C020-90PU

Microchip TechnologyIn Stock: 1362AT27C020-90PU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT27C020-15PI is determined by the following critical parameters that must remain constant:

• Memory capacity (2Mbit)
• Memory organization (256K x 8)
• Parallel interface architecture
• Package type (32-DIP)
• Supply voltage range (4.5V ~ 5.5V)
• Operating temperature range (-40°C ~ 85°C)
• Through-hole mounting compatibility

The AT27C020-90PU qualifies as a direct substitute based on identical values across all these parameters. The access time difference (90 ns versus 150 ns) represents an improvement in performance characteristics and does not prevent substitution in applications designed for the original part.

Parameter Comparison

Engineering Selection Recommendations

The AT27C020-90PU is the qualified substitute for the AT27C020-15PI based on the following factors:

• Identical electrical and mechanical specifications across all critical parameters
• Active product status ensures ongoing availability and supply chain continuity
• ROHS3 compliance of the substitute addresses regulatory requirements not met by the obsolete original part
• Faster access time (90 ns) provides performance margin without requiring circuit redesign
• Identical package and pinout enable direct board-level replacement without layout modifications
• Both parts share the same base product number (AT27C020) and are manufactured by the same supplier

Frequently Asked Questions (FAQ)

Q: Can the AT27C020-90PU be used as a direct replacement for the AT27C020-15PI?

A: Yes. Both parts are electrically and mechanically identical across all functional parameters. The 32-DIP package, pinout, voltage requirements, temperature range, and memory organization are identical. The faster access time of the substitute does not create compatibility issues.

Q: What is the significance of the access time difference between 150 ns and 90 ns?

A: Access time defines the maximum delay from address presentation to data availability. The AT27C020-90PU's 90 ns access time is faster than the AT27C020-15PI's 150 ns specification. This represents improved performance and does not prevent substitution in circuits designed for the original part.

Q: Are there packaging differences between these parts?

A: Both parts use 32-DIP (0.600", 15.24mm) through-hole packages. The AT27C020-15PI is supplied in standard packaging, while the AT27C020-90PU is supplied in tube packaging. Both are compatible with identical PCB footprints and socket configurations.

Q: Why is the original part listed as obsolete?

A: The AT27C020-15PI is classified as obsolete by the manufacturer. The AT27C020-90PU remains in active production, ensuring availability for new designs and system maintenance requiring 2Mbit parallel EPROM functionality.

Q: Does the RoHS compliance difference affect substitution?

A: The AT27C020-90PU's ROHS3 compliance represents an advantage over the non-compliant original part. This compliance status supports regulatory requirements in many applications and markets without affecting electrical or mechanical compatibility.