AT27C4096-12PC Equivalent & Substitute Parts

Part Overview

The AT27C4096-12PC is a 4Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 40-DIP package. This part is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing system support and component procurement. The AT27C4096-12PC operates with a 120 ns access time and is designed for applications requiring non-volatile memory storage in legacy embedded systems.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EPROM
Memory Size	4Mbit
Memory Organization	256K x 16
Memory Interface	Parallel
Access Time	120 ns
Voltage Supply	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	40-DIP (0.600", 15.24mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AT27C4096-12PC is determined by the following critical parameters:

Memory Capacity & Organization: Substitute parts must maintain 4Mbit capacity with 256K x 16 organization to ensure address and data bus compatibility
Package & Pinout: The 40-DIP package is mandatory for mechanical and electrical compatibility with existing PCB layouts
Voltage Supply Range: Supply voltage must remain within 4.5V ~ 5.5V to ensure compatibility with host system power delivery
Memory Interface: Parallel interface architecture must be preserved for direct signal compatibility
Access Time: Substitute parts with equal or faster access times (≤120 ns) maintain or improve system timing margins

The AT27C4096-90PU qualifies as a direct substitute based on identical memory capacity, organization, package, voltage supply range, and parallel interface. The faster 90 ns access time provides improved timing performance compared to the original 120 ns specification.

Parameter Comparison

Parameter	AT27C4096-12PC (Main Part)	AT27C4096-90PU (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Memory Type	Non-Volatile EPROM	Non-Volatile EPROM
Memory Size	4Mbit	4Mbit
Memory Organization	256K x 16	256K x 16
Memory Interface	Parallel	Parallel
Access Time	120 ns	90 ns
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V
Package Type	40-DIP (0.600", 15.24mm)	40-DIP (0.600", 15.24mm)
Mounting Type	Through Hole	Through Hole
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The AT27C4096-90PU is the qualified substitute for the AT27C4096-12PC based on the following engineering criteria:

Functional Equivalence: Identical memory capacity, organization, and parallel interface ensure direct functional replacement without firmware or hardware modification
Improved Timing Performance: The 90 ns access time is faster than the original 120 ns specification, providing additional timing margin in host systems
Active Product Status: The AT27C4096-90PU maintains active production status, ensuring long-term availability and supply chain continuity
Enhanced Compliance: The substitute part is ROHS3 compliant, whereas the original part is RoHS non-compliant, supporting modern procurement and environmental standards
Extended Operating Range: The substitute part supports -40°C ~ 85°C operating temperature, exceeding the original 0°C ~ 70°C range for broader application flexibility
Package Compatibility: Identical 40-DIP through-hole package ensures direct PCB compatibility without layout modifications

Frequently Asked Questions (FAQ)

Q: Can the AT27C4096-90PU be used as a direct replacement for the AT27C4096-12PC?

A: Yes. Both parts share identical memory capacity (4Mbit), organization (256K x 16), parallel interface, voltage supply range (4.5V ~ 5.5V), and 40-DIP package. The substitute part's faster 90 ns access time is compatible with systems designed for 120 ns operation.

Q: What is the difference in access time between these parts?

A: The AT27C4096-12PC has 120 ns access time, while the AT27C4096-90PU has 90 ns access time. The faster access time of the substitute part does not create compatibility issues in systems designed for the slower original part.

Q: Are there package differences between these parts?

A: No. Both parts use the 40-DIP (0.600", 15.24mm) through-hole package with identical pinout and mechanical dimensions.

Q: What is the operating temperature range difference?

A: The AT27C4096-12PC operates from 0°C ~ 70°C, while the AT27C4096-90PU operates from -40°C ~ 85°C. The substitute part supports a wider temperature range suitable for extended environmental conditions.

Q: Does the substitute part meet modern compliance standards?

A: Yes. The AT27C4096-90PU is ROHS3 compliant, whereas the original AT27C4096-12PC is RoHS non-compliant. The substitute part meets current environmental and procurement regulations.

Q: Are voltage supply requirements identical?

A: Yes. Both parts require 4.5V ~ 5.5V supply voltage, ensuring compatibility with existing power delivery systems without modification.

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