AT27C512R-70PI Equivalent & Substitute Parts

Part Overview

The AT27C512R-70PI is a 512Kbit EPROM (Erasable Programmable Read-Only Memory) IC manufactured by Microchip Technology, housed in a 28-pin DIP package with 70 ns access time. This part operates as a non-volatile parallel memory device suitable for legacy embedded systems and industrial applications requiring permanent code storage.

The AT27C512R-70PI is classified as obsolete. Finding equivalent substitute parts is necessary to maintain system functionality in production environments, support ongoing repairs, or transition designs to active product lines while maintaining electrical and mechanical compatibility.

Substiute Parts

AT27C512R-70PI

Microchip TechnologyIn Stock: 1373AT27C512R-70PI Datasheet

Current PartRFQ

AT27C512R-70PU

Microchip TechnologyIn Stock: 6889AT27C512R-70PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT27C512R-70PI is determined by strict equivalence across the following parameters:

• Memory capacity: 512Kbit (64K x 8 organization)
• Memory technology: EPROM - OTP (One-Time Programmable)
• Access time: 70 ns maximum
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: -40°C ~ 85°C
• Package: 28-DIP through-hole configuration
• Parallel interface architecture

The AT27C512R-70PU meets all substitution criteria. Both parts share the same base product number (AT27C512), identical electrical specifications, and compatible physical packaging. The primary difference is packaging format (DIP tube vs. DIP bulk) and product status (active vs. obsolete).

Parameter Comparison

Engineering Selection Recommendations

The AT27C512R-70PU is a direct electrical and mechanical substitute for the AT27C512R-70PI. Both parts are manufactured by Microchip Technology and share identical core specifications across memory capacity, access time, voltage requirements, temperature range, and physical packaging.

The AT27C512R-70PU offers two significant advantages over the obsolete AT27C512R-70PI:

• Active product status ensures ongoing availability and supply chain continuity
• ROHS3 compliance satisfies modern environmental and regulatory requirements, whereas the AT27C512R-70PI is RoHS non-compliant

For new designs, production restocking, or system maintenance requiring long-term component availability, the AT27C512R-70PU is the appropriate selection. Pin-for-pin compatibility and identical electrical performance ensure direct substitution without circuit modification.

Frequently Asked Questions (FAQ)

Q: Are the AT27C512R-70PI and AT27C512R-70PU pin-compatible?

A: Yes. Both parts use the 28-DIP package with identical pinout. Direct socket substitution is possible without PCB modification.

Q: What is the difference between the -70PI and -70PU suffix designations?

A: The suffix indicates packaging format. The -70PI uses DIP packaging in bulk form, while the -70PU uses DIP packaging in tube format. Electrical specifications are identical.

Q: Can the AT27C512R-70PU replace the AT27C512R-70PI in existing systems?

A: Yes. The AT27C512R-70PU is electrically and mechanically equivalent. It operates at the same voltage, temperature range, and access time specifications.

Q: Why is the AT27C512R-70PI listed as obsolete?

A: The AT27C512R-70PI has been discontinued by Microchip Technology. The AT27C512R-70PU remains in active production and is the recommended replacement for ongoing supply requirements.

Q: Does the RoHS compliance difference affect substitution?

A: From an electrical and functional standpoint, no. The RoHS3 compliance of the AT27C512R-70PU indicates it meets current environmental standards. For applications subject to RoHS regulations, the AT27C512R-70PU is the required choice.

Q: What is the memory organization of these parts?

A: Both parts organize 512Kbit of memory as 64K x 8, meaning 65,536 addressable locations with 8-bit data width per location.

Q: Are these parts suitable for new designs?

A: The AT27C512R-70PU is suitable for new designs requiring parallel EPROM functionality. However, for modern applications, evaluate whether flash memory or other non-volatile technologies better serve current system requirements.