Equivalent & Substitute Parts Reference: AT28HC256-12SC

Part Overview

The AT28HC256-12SC is an EEPROM memory IC with a capacity of 256Kbit, organized as 32K x 8 bits, featuring a parallel interface and an access time of 120 ns. It is housed in a 28-SOIC (0.295", 7.50mm Width) surface-mount package and operates with a supply voltage range of 4.5V to 5.5V. This device is currently classified as Obsolete, necessitating the identification of alternative part numbers that meet the same key electrical, mechanical, and regulatory parameters.

Substiute Parts

AT28HC256-12SC

Microchip TechnologyIn Stock: 1062AT28HC256-12SC Datasheet

Current PartRFQ

AT28HC256-12SU

Microchip TechnologyIn Stock: 1524AT28HC256-12SU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AT28HC256-12SC is based strictly on matching the following parameters: manufacturer, memory type, memory format, technology, memory size and organization, interface, write cycle time, access time, voltage supply, operating temperature, mounting type, package/case specification, supplier device package, RoHS/REACH status, moisture sensitivity level (MSL), and ECCN. Only parts with identical or explicitly compatible values for these parameters are included as substitutes.

Parameter Comparison

Engineering Selection Recommendations

The AT28HC256-12SC is designated as Obsolete. The defined substitute part, AT28HC256-12SU, matches all critical electrical, mechanical, and regulatory parameters and is classified as Active. The substitute part is ROHS3 compliant, whereas the main part is RoHS non-compliant. The substitute also offers broader operating temperature range. Both parts share the same MSL and ECCN classifications and meet REACH regulatory status. Direct substitution is justified strictly based on these documented parameters.

Frequently Asked Questions (FAQ)

Q1: Which electrical parameters determine a valid substitute for AT28HC256-12SC?
A1: Memory type, format, technology, size, organization, interface, write cycle time, access time, and supply voltage are required to match for substitution.

Q2: Are there package-related considerations for substituting AT28HC256-12SC?
A2: Yes. The mounting type, package/case specification, and supplier device package must be identical to maintain form factor compatibility.

Q3: How does RoHS status impact substitute selection?
A3: Substitute selection can include parts with different RoHS statuses as long as it is documented. AT28HC256-12SU is ROHS3 compliant, whereas the AT28HC256-12SC is RoHS non-compliant.

Q4: Why is it necessary to evaluate the ECCN and REACH status during substitution?
A4: ECCN and REACH status provide compliance confirmation for specific regulatory and export requirements, ensuring substitutes meet operational and supply chain needs.

Q5: Can substitutes with wider operating temperature ranges be used?
A5: The substitute AT28HC256-12SU operates over a broader temperature range but remains compatible with the main part’s specified range.