AT27C4096-90PC Equivalent & Substitute Parts

Part Overview

The AT27C4096-90PC is a 4Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 40-pin DIP package with 90 ns access time. This part is classified as obsolete, making substitute components necessary for new designs, repairs, or production continuity. The AT27C4096-90PC operates within the 4.5V to 5.5V supply voltage range and supports standard parallel memory interface protocols common to legacy embedded systems and industrial applications.

Substiute Parts

AT27C4096-90PC

Microchip TechnologyIn Stock: 3892AT27C4096-90PC Datasheet

Current PartRFQ

AT27C4096-90PU

Microchip TechnologyIn Stock: 1800AT27C4096-90PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT27C4096-90PC is determined by strict equivalence across the following critical parameters:

• Memory capacity: 4Mbit
• Memory organization: 256K x 16
• Interface type: Parallel
• Access time: 90 ns
• Supply voltage: 4.5V ~ 5.5V
• Package: 40-DIP (0.600", 15.24mm)
• Mounting: Through Hole

The AT27C4096-90PU meets all these requirements and is therefore a direct functional equivalent. The primary difference between these parts is packaging format (tube vs. standard) and product status (active vs. obsolete), not electrical or mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The AT27C4096-90PU is the direct substitute for the AT27C4096-90PC. Both parts share identical electrical and mechanical specifications for memory capacity, organization, interface, access time, supply voltage, and package dimensions.

The AT27C4096-90PU offers two advantages over the obsolete AT27C4096-90PC:

• Active product status ensures continued availability and supply chain reliability
• ROHS3 compliance meets current environmental and regulatory standards, whereas the AT27C4096-90PC is RoHS non-compliant

The AT27C4096-90PU operates across an extended temperature range (-40°C to 85°C) compared to the AT27C4096-90PC (0°C to 70°C), providing greater thermal margin for industrial and extended-temperature applications.

Frequently Asked Questions (FAQ)

Q: Can the AT27C4096-90PU directly replace the AT27C4096-90PC in existing designs?

A: Yes. Both parts are electrically and mechanically identical in all critical parameters: 4Mbit capacity, 256K x 16 organization, parallel interface, 90 ns access time, 4.5V to 5.5V supply voltage, and 40-DIP package. Pin-for-pin compatibility is maintained.

Q: What is the difference between the AT27C4096-90PC and AT27C4096-90PU?

A: The primary differences are packaging format (standard vs. tube), product status (obsolete vs. active), RoHS compliance (non-compliant vs. ROHS3 compliant), and operating temperature range (0°C to 70°C vs. -40°C to 85°C). Electrical and mechanical specifications are identical.

Q: Why is the AT27C4096-90PC classified as obsolete?

A: The AT27C4096-90PC has reached end-of-life status. The AT27C4096-90PU remains in active production and is the recommended substitute for new designs and ongoing production requirements.

Q: Does the extended temperature range of the AT27C4096-90PU affect compatibility?

A: No. The extended operating range (-40°C to 85°C) of the AT27C4096-90PU is a superset of the AT27C4096-90PC range (0°C to 70°C). The part functions correctly within the original temperature specifications and provides additional thermal margin.

Q: Are there any compliance considerations when substituting these parts?

A: Yes. The AT27C4096-90PU is ROHS3 compliant, while the AT27C4096-90PC is RoHS non-compliant. For applications subject to RoHS regulations, the AT27C4096-90PU is the required choice.