AT27C512R-70PC EPROM Memory IC - Equivalent & Substitute Parts

Part Overview

The AT27C512R-70PC is a 512Kbit parallel EPROM (Erasable Programmable Read-Only Memory) manufactured by Microchip Technology in a 28-DIP package with 70 ns access time. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing system support. The part operates within the 4.5V to 5.5V supply voltage range and is suitable for legacy embedded systems requiring non-volatile parallel memory storage.

Substiute Parts

AT27C512R-70PC

Microchip TechnologyIn Stock: 2343AT27C512R-70PC Datasheet

Current PartRFQ

AT27C512R-70PU

Microchip TechnologyIn Stock: 6889AT27C512R-70PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT27C512R-70PC is determined by strict equivalence across the following critical parameters:

• Memory capacity and organization (512Kbit, 64K x 8 configuration)
• Parallel interface architecture
• Access time specification (70 ns)
• Supply voltage compatibility (4.5V ~ 5.5V)
• Physical package format (28-DIP)
• Through-hole mounting compatibility

The AT27C512R-70PU qualifies as a direct substitute based on identical electrical specifications and package dimensions. The primary distinction lies in product status and operating temperature range, which affects suitability for specific application environments.

Parameter Comparison

Engineering Selection Recommendations

The AT27C512R-70PU is the direct functional equivalent for AT27C512R-70PC replacement. Selection between these parts depends on application requirements:

AT27C512R-70PU is preferred when:

• New designs or production runs require active product status and ongoing manufacturer support
• Applications operate within the extended temperature range (-40°C to 85°C)
• RoHS3 compliance is mandated by design specifications or regulatory requirements
• Long-term component availability and supply chain stability are critical

AT27C512R-70PC remains applicable when:

• Legacy system maintenance requires exact original part matching
• Operating environment is constrained to 0°C to 70°C
• RoHS compliance is not a design requirement

Both parts share identical electrical performance, memory capacity, access timing, and physical form factor, ensuring direct pin-for-pin compatibility in 28-DIP socket applications.

Frequently Asked Questions (FAQ)

Q: Can AT27C512R-70PU directly replace AT27C512R-70PC in existing designs?

A: Yes. Both parts are electrically and mechanically identical with respect to memory capacity (512Kbit), organization (64K x 8), access time (70 ns), supply voltage (4.5V ~ 5.5V), and 28-DIP package dimensions. Pin-for-pin substitution is valid for applications operating within 0°C to 70°C.

Q: What is the difference between the -70PC and -70PU package designations?

A: The suffix indicates packaging format. The -70PC uses standard DIP packaging, while -70PU uses tube packaging. Both contain identical die and electrical specifications. The packaging difference affects storage, handling, and inventory management but not functional performance.

Q: Does the extended temperature range of AT27C512R-70PU affect compatibility?

A: No. The AT27C512R-70PU operates from -40°C to 85°C, which encompasses the AT27C512R-70PC range of 0°C to 70°C. The wider specification ensures operation across both temperature windows without functional degradation.

Q: Why is AT27C512R-70PC classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The AT27C512R-70PU remains in active production, making it the recommended choice for new applications and ongoing system support.

Q: Are there RoHS compliance implications for substitution?

A: Yes. AT27C512R-70PC is RoHS non-compliant, while AT27C512R-70PU is ROHS3 compliant. Applications subject to RoHS regulations must use the -70PU variant. For legacy systems without RoHS requirements, either part is acceptable.

Q: What is the memory organization 64K x 8?

A: This denotes 65,536 addressable memory locations (64K), each containing 8 bits of data. This organization is identical across both parts and determines the parallel interface pin configuration and address/data bus requirements.