AT28C64X-15PI Equivalent & Substitute Parts

Part Overview

The AT28C64X-15PI is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 28-DIP package with 150 ns access time. This part is classified as obsolete, which necessitates identification of active equivalent alternatives for ongoing system support and new designs. The AT28C64X-15PI operates across the industrial temperature range of -40°C to 85°C and requires a 4.5V to 5.5V supply voltage.

Substiute Parts

AT28C64X-15PI

Microchip TechnologyIn Stock: 1203AT28C64X-15PI Datasheet

Current PartRFQ

AT28C64B-15PU

Microchip TechnologyIn Stock: 3411AT28C64B-15PU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT28C64X-15PI is determined by strict equivalence across the following critical parameters:

• Memory capacity: 64Kbit
• Memory organization: 8K x 8 configuration
• Interface type: Parallel
• Access time: 150 ns maximum
• Supply voltage range: 4.5V ~ 5.5V
• Package: 28-DIP form factor
• Mounting: Through-hole technology
• Temperature range: -40°C to 85°C

The AT28C64B-15PU meets all these requirements while offering improved product status and compliance certifications. The write cycle time difference (10 ms vs. 1 ms) does not affect functional substitution, as both values remain within acceptable EEPROM operation parameters for this device class.

Parameter Comparison

Engineering Selection Recommendations

The AT28C64B-15PU is the direct substitute for the AT28C64X-15PI. Selection of the AT28C64B-15PU is supported by the following factors:

• Active product status ensures long-term availability and manufacturing support
• ROHS3 compliance meets current environmental and regulatory requirements
• Identical electrical specifications and package footprint enable direct board-level replacement
• Verified programmability status confirms functional compatibility

The AT28C64X-15PI, classified as obsolete, should be replaced with the AT28C64B-15PU in new designs and ongoing production to ensure supply chain continuity and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the AT28C64B-15PU be used as a direct replacement for the AT28C64X-15PI?

A: Yes. Both parts share identical memory capacity (64Kbit), organization (8K x 8), access time (150 ns), supply voltage range (4.5V ~ 5.5V), operating temperature range (-40°C ~ 85°C), and 28-DIP package footprint. The write cycle time difference does not affect functional compatibility.

Q: What is the significance of the product status difference?

A: The AT28C64X-15PI is obsolete, meaning Microchip Technology no longer manufactures or supports this part. The AT28C64B-15PU is active, ensuring continued availability, manufacturing support, and compliance with current standards.

Q: Does the RoHS compliance difference affect substitution?

A: The AT28C64B-15PU is ROHS3 compliant, while the AT28C64X-15PI is non-compliant. For applications subject to RoHS regulations, the AT28C64B-15PU is the required choice. For legacy systems without RoHS requirements, both parts remain electrically equivalent.

Q: Are there any pin-level or timing considerations for board redesign?

A: No redesign is required. Both parts use the 28-DIP package with identical pinout and electrical characteristics. The 150 ns access time is matched across both parts. The write cycle time increase (1 ms to 10 ms) does not require circuit modification.

Q: What is the base product number for these parts?

A: Both the AT28C64X-15PI and AT28C64B-15PU share the base product number AT28C64, indicating they are variants within the same product family.