AT27C080-90DC Equivalent & Substitute Parts

Part Overview

The AT27C080-90DC is an 8Mbit EPROM (Erasable Programmable Read-Only Memory) with UV erasure capability, manufactured by Microchip Technology. This parallel interface memory device operates at 90 ns access time and is housed in a 32-CDIP package. The product is classified as obsolete, making identification of compatible substitute parts essential for system maintenance, repair, and legacy equipment support.

Substiute Parts

AT27C080-90DC

Microchip TechnologyIn Stock: 1302AT27C080-90DC Datasheet

Current PartRFQ

AT27C080-90PU

Microchip TechnologyIn Stock: 1605AT27C080-90PU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT27C080-90DC is determined by the following critical parameters:

• Memory Capacity & Organization: 8Mbit, 1M x 8 configuration
• Memory Interface: Parallel interface architecture
• Access Time: 90 ns maximum
• Supply Voltage: 4.5V ~ 5.5V operating range
• Mounting Type: Through Hole configuration
• Package Compatibility: 32-pin DIP-class packages (CDIP or PDIP variants)
• Base Product Number: AT27C080 series

The AT27C080-90PU qualifies as a substitute based on matching memory capacity, organization, interface type, access time, voltage requirements, and mounting type. Both devices share the same base product number (AT27C080) and are manufactured by Microchip Technology. Package differences (CDIP vs. PDIP) are mechanically compatible within standard 32-pin DIP footprints used in through-hole applications.

Parameter Comparison

Engineering Selection Recommendations

The AT27C080-90PU is the qualified substitute for the AT27C080-90DC based on the following factors:

Functional Equivalence: Both devices provide identical memory capacity (8Mbit), organization (1M x 8), interface type (Parallel), and access time (90 ns). Electrical specifications for supply voltage (4.5V ~ 5.5V) are identical.

Package Compatibility: The 32-CDIP and 32-DIP packages are mechanically compatible within standard through-hole PCB designs. Both maintain the 0.600" (15.24mm) body width and 32-pin configuration.

Product Status Advantage: The AT27C080-90PU holds Active product status, ensuring continued availability and support, whereas the AT27C080-90DC is classified as Obsolete.

Compliance Improvement: The substitute part achieves ROHS3 compliance, compared to the non-compliant status of the original part. This provides regulatory advantage for new designs and system updates.

Operating Temperature Range: The AT27C080-90PU supports an extended operating temperature range (-40°C ~ 85°C) compared to the original part (0°C ~ 70°C), providing broader environmental compatibility.

Frequently Asked Questions (FAQ)

Q: Can the AT27C080-90PU directly replace the AT27C080-90DC in existing designs?

A: Yes. Both devices share identical memory capacity, organization, parallel interface, access time, and supply voltage specifications. The 32-CDIP and 32-DIP packages are mechanically compatible in through-hole applications. Pin configuration and electrical characteristics are equivalent.

Q: What is the difference between CDIP and DIP packaging?

A: CDIP (Ceramic Dual In-line Package) and DIP (Dual In-line Package) are both 32-pin through-hole packages with identical 0.600" body width and pin spacing. The primary difference is material composition (ceramic vs. plastic). Both are mechanically compatible in standard DIP sockets and PCB footprints.

Q: Why does the substitute part have a wider operating temperature range?

A: The AT27C080-90PU supports -40°C ~ 85°C, while the original supports 0°C ~ 70°C. This reflects different manufacturing specifications and testing standards. The wider range of the substitute provides greater environmental flexibility for applications requiring extended temperature operation.

Q: Is the RoHS compliance difference significant?

A: The AT27C080-90PU achieves ROHS3 compliance, whereas the AT27C080-90DC is non-compliant. For new system designs, regulatory updates, or applications subject to RoHS requirements, the substitute part is the appropriate choice. For legacy system maintenance where original specifications are required, the original part may be necessary.

Q: Are there any electrical performance differences between these parts?

A: No. Both devices provide identical access time (90 ns), supply voltage range (4.5V ~ 5.5V), memory capacity (8Mbit), and parallel interface specifications. Electrical performance is equivalent.