AT27C512R-45PI Equivalent & Substitute Parts

Part Overview

The AT27C512R-45PI is a 512Kbit EPROM (Erasable Programmable Read-Only Memory) IC manufactured by Microchip Technology, housed in a 28-pin DIP package with 45 ns access time. This part operates as a non-volatile, one-time programmable (OTP) memory device suitable for parallel interface applications requiring fixed code storage.

The AT27C512R-45PI is classified as obsolete. Locating equivalent or substitute parts is necessary for system maintenance, legacy equipment repair, and production continuity when original inventory becomes unavailable.

Substiute Parts

AT27C512R-45PI

Microchip TechnologyIn Stock: 1480AT27C512R-45PI Datasheet

Current PartRFQ

AT27C512R-45PU

Microchip TechnologyIn Stock: 6876AT27C512R-45PU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT27C512R-45PI is determined by strict equivalence across the following parameters:

• Memory capacity: 512Kbit (64K x 8 organization)
• Memory interface: Parallel configuration
• Access time: 45 ns maximum
• Supply voltage: 4.5V ~ 5.5V range
• Operating temperature: -40°C ~ 85°C
• Package: 28-DIP through-hole form factor
• Manufacturer: Microchip Technology (AT27C512 base series)

The AT27C512R-45PU qualifies as a direct substitute based on identical electrical specifications and package configuration. The primary distinction is packaging format (tube vs. DIP) and product status (active vs. obsolete).

Parameter Comparison

Engineering Selection Recommendations

The AT27C512R-45PU is the direct functional equivalent of the AT27C512R-45PI. Both parts share identical electrical and mechanical specifications, ensuring pin-for-pin compatibility and equivalent performance in parallel EPROM applications.

Selection between these parts should be based on:

• Product availability: AT27C512R-45PI is obsolete; AT27C512R-45PU is active production
• Regulatory compliance: AT27C512R-45PU meets ROHS3 requirements; AT27C512R-45PI does not
• Supply chain continuity: AT27C512R-45PU offers greater long-term availability

For new designs or systems requiring regulatory compliance, AT27C512R-45PU is the appropriate selection. For legacy system maintenance where original specifications must be preserved, AT27C512R-45PI remains functionally equivalent where available.

Frequently Asked Questions (FAQ)

Q: Can AT27C512R-45PU replace AT27C512R-45PI in existing circuits?

A: Yes. Both parts are electrically and mechanically identical. Pin configuration, voltage requirements, timing specifications, and temperature operating ranges are equivalent. Direct substitution is possible without circuit modification.

Q: What is the difference between the -45PI and -45PU package designations?

A: The suffix indicates packaging format. -PI denotes DIP packaging; -PU denotes tube packaging. Both contain the same die and electrical specifications. The packaging difference affects only handling and storage methods, not functional performance.

Q: Why is AT27C512R-45PI listed as obsolete?

A: Microchip Technology has transitioned this part to end-of-life status. AT27C512R-45PU remains in active production as the current equivalent offering.

Q: Are there RoHS compliance differences between these parts?

A: Yes. AT27C512R-45PI is RoHS non-compliant. AT27C512R-45PU is ROHS3 compliant. For applications subject to RoHS regulations, AT27C512R-45PU is required.

Q: What memory capacity does the AT27C512R-45PI provide?

A: 512Kbit organized as 64K x 8 bits, accessible through a parallel interface with 45 ns maximum access time.

Q: Is the 28-DIP package still widely supported in modern PCB designs?

A: The 28-DIP through-hole package remains standard for legacy system maintenance and repair. Modern designs typically employ surface-mount alternatives or higher-density memory solutions.