AT27C1024-70PC EPROM Equivalent & Substitute Parts

Part Overview

The AT27C1024-70PC is a 1Mbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 40-pin DIP package with 70 ns access time. This part is classified as obsolete, making substitute identification critical for legacy system maintenance and component sourcing. The AT27C1024 series provides non-volatile memory storage suitable for embedded systems requiring parallel memory interfaces with standard TTL-compatible voltage levels.

Substiute Parts

AT27C1024-70PC

Microchip TechnologyIn Stock: 2206AT27C1024-70PC Datasheet

Current PartRFQ

AT27C1024-70PU

Microchip TechnologyIn Stock: 5401AT27C1024-70PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT27C1024-70PC is determined by strict equivalence across the following parameters:

• Memory capacity (1Mbit)
• Memory organization (64K x 16)
• Parallel interface architecture
• Access time specification (70 ns)
• Supply voltage range (4.5V ~ 5.5V)
• Package form factor (40-DIP)
• Pin configuration compatibility

The AT27C1024-70PU qualifies as a direct substitute based on identical electrical specifications and package geometry. The primary distinction is packaging format (tube vs. DIP) and product status (active vs. obsolete).

Parameter Comparison

Engineering Selection Recommendations

The AT27C1024-70PU is the qualified substitute for AT27C1024-70PC applications. Both parts maintain electrical and mechanical equivalence across all critical parameters including memory capacity, access time, voltage specifications, and DIP package geometry.

The AT27C1024-70PU offers extended advantages: active product status ensures continued availability, ROHS3 compliance satisfies modern procurement standards, and expanded operating temperature range (-40°C ~ 85°C) provides thermal margin beyond the original specification (0°C ~ 70°C). These characteristics make the -70PU variant suitable for legacy system retrofits and new production applications requiring AT27C1024 functionality.

Selection between these parts depends on application thermal requirements and regulatory compliance mandates. Systems operating within the original 0°C ~ 70°C range accept either variant. Applications requiring extended temperature operation or RoHS compliance must specify AT27C1024-70PU.

Frequently Asked Questions (FAQ)

Q: Can AT27C1024-70PU directly replace AT27C1024-70PC in existing designs?

A: Yes. Both parts share identical pin configurations, electrical specifications, and package dimensions. No circuit modifications are required for substitution.

Q: What is the significance of the temperature range difference?

A: The AT27C1024-70PC operates 0°C ~ 70°C; the AT27C1024-70PU operates -40°C ~ 85°C. The -70PU provides wider thermal coverage. Applications within the original range accept either part. Systems requiring extended temperature operation must use -70PU.

Q: Why is the AT27C1024-70PC classified as obsolete?

A: Obsolete status indicates Microchip Technology has discontinued production. The AT27C1024-70PU remains in active production, making it the recommended source for new component procurement.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS3 compliance in the AT27C1024-70PU reflects manufacturing process changes only. Electrical and functional specifications remain identical to the non-compliant variant.

Q: Are packaging differences between tube and DIP significant?

A: Packaging format affects handling and storage only. Electrical and mechanical specifications are identical. Component selection depends on assembly process requirements and inventory management practices.

Q: Can these parts be used interchangeably in production?

A: Yes, provided operating temperature requirements fall within both specifications (0°C ~ 70°C). For applications requiring extended temperature operation or RoHS compliance, AT27C1024-70PU is mandatory.