AT28HC64B-90PI Equivalent & Substitute Parts

Part Overview

The AT28HC64B-90PI is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 28-DIP package with 90 ns access time. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance, repairs, and legacy product support. The part operates across the industrial temperature range of -40°C to 85°C and requires a 4.5V to 5.5V supply voltage.

Substiute Parts

AT28HC64B-90PI

Microchip TechnologyIn Stock: 702AT28HC64B-90PI Datasheet

Current PartRFQ

X28HC64PIZ-12

Renesas Electronics CorporationIn Stock: 5300X28HC64PIZ-12 Datasheet

MFR RecommendedRFQ

X28HC64PZ-12

Renesas Electronics CorporationIn Stock: 2139X28HC64PZ-12 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT28HC64B-90PI is determined by the following critical parameters:

• Memory capacity (64Kbit) and organization (8K x 8)
• Parallel interface architecture
• Package compatibility (28-DIP form factor)
• Supply voltage range (4.5V ~ 5.5V)
• Access time and write cycle time specifications

The identified substitute parts maintain these core electrical and mechanical specifications, ensuring functional compatibility in legacy circuit designs. Both substitute parts are manufactured by Renesas Electronics Corporation and are classified as active products with current availability.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products with confirmed current inventory availability, addressing the obsolescence status of the AT28HC64B-90PI. The X28HC64PZ-12 maintains full electrical parameter compatibility with the original part, including the 4.5V to 5.5V supply voltage range and 28-DIP package specification. This part achieves ROHS3 compliance and operates within a 0°C to 70°C temperature range.

The X28HC64PIZ-12 is also ROHS3 compliant and maintains the 28-DIP package form factor. Detailed electrical specifications for this variant are limited in the provided data.

Both substitute parts satisfy the core functional requirements for 64Kbit parallel EEPROM applications and are suitable for direct replacement in legacy circuit designs where the original AT28HC64B-90PI is no longer available.

Frequently Asked Questions (FAQ)

Q: Can the X28HC64PZ-12 directly replace the AT28HC64B-90PI in existing designs?

A: Yes. Both parts share identical memory capacity (64Kbit), organization (8K x 8), parallel interface, supply voltage range (4.5V ~ 5.5V), and 28-DIP package specifications. The X28HC64PZ-12 operates at 120 ns access time compared to the original 90 ns specification, which is acceptable for most legacy applications.

Q: What is the difference between the two Renesas substitute parts?

A: Both X28HC64PIZ-12 and X28HC64PZ-12 are 64Kbit parallel EEPROMs in 28-DIP packages. The X28HC64PZ-12 provides complete electrical parameter documentation including access time (120 ns) and write cycle time (5 ms). The X28HC64PIZ-12 has limited specification data available but maintains the same core memory architecture and package compatibility.

Q: Are there temperature range considerations for substitution?

A: The X28HC64PZ-12 operates across 0°C to 70°C, which is narrower than the original part's -40°C to 85°C range. Applications requiring extended temperature operation should verify compatibility with the specific operating environment.

Q: Do the substitute parts meet current compliance standards?

A: Both substitute parts are ROHS3 compliant, addressing modern environmental and regulatory requirements. The original AT28HC64B-90PI is RoHS non-compliant, making these substitutes suitable for new production and updated legacy systems.

Q: Is the 28-DIP package form factor identical across all three parts?

A: Yes. All three parts use the 28-DIP (0.600", 15.24mm) package specification, ensuring mechanical compatibility with existing PCB layouts and socket configurations.