AT28C256F-15SC EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AT28C256F-15SC is a 256Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 28-SOIC surface mount package. This device provides non-volatile memory storage with a 150 ns access time and 3ms write cycle time, operating across a 4.5V to 5.5V supply voltage range. The part is currently classified as obsolete, making identification of compatible substitute components essential for ongoing system support, design updates, and production continuity.

Substiute Parts

AT28C256F-15SC

Microchip TechnologyIn Stock: 667AT28C256F-15SC Datasheet

Current PartRFQ

AT28C256F-15SU

Microchip TechnologyIn Stock: 1326AT28C256F-15SU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT28C256F-15SC is determined by strict alignment of the following critical parameters:

• Memory capacity: 256Kbit (32K x 8 organization)
• Interface type: Parallel
• Access time: 150 ns or faster
• Write cycle time: 3ms or faster
• Supply voltage: 4.5V ~ 5.5V compatible
• Package: 28-SOIC form factor
• Mounting: Surface mount

The AT28C256F-15SU qualifies as a direct substitute based on identical electrical specifications and package configuration. Differences in product status, operating temperature range, and compliance certifications do not affect functional interchangeability within the specified electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

The AT28C256F-15SU is the qualified substitute for the AT28C256F-15SC. Both devices share identical electrical and mechanical specifications, ensuring direct functional compatibility. The AT28C256F-15SU offers the additional advantage of active product status, providing ongoing availability and supply chain stability compared to the obsolete AT28C256F-15SC.

For applications requiring RoHS3 compliance, the AT28C256F-15SU meets this requirement, whereas the AT28C256F-15SC does not. The extended operating temperature range of the AT28C256F-15SU (-40°C ~ 85°C versus 0°C ~ 70°C) provides broader environmental tolerance, though this does not affect substitution validity for applications within the original temperature specification.

Frequently Asked Questions (FAQ)

Q: Can AT28C256F-15SU directly replace AT28C256F-15SC in existing designs?

A: Yes. Both parts are electrically and mechanically identical across all critical parameters: 256Kbit capacity, 32K x 8 organization, parallel interface, 150 ns access time, 3ms write cycle time, 4.5V ~ 5.5V supply voltage, and 28-SOIC package. Pin-for-pin compatibility is confirmed.

Q: What is the difference in operating temperature range between these parts?

A: The AT28C256F-15SC operates from 0°C to 70°C, while the AT28C256F-15SU operates from -40°C to 85°C. For applications within the 0°C to 70°C range, both parts perform identically. The extended range of the AT28C256F-15SU does not affect substitution for standard industrial temperature applications.

Q: Does the RoHS compliance difference affect substitution?

A: RoHS compliance status does not affect electrical or mechanical interchangeability. The AT28C256F-15SU is ROHS3 compliant while the AT28C256F-15SC is not. Selection between these parts should be based on system-level compliance requirements, not functional compatibility.

Q: Are there any packaging differences between these substitutes?

A: Both parts use identical 28-SOIC surface mount packaging (0.295", 7.50mm width). No PCB layout or assembly process modifications are required for substitution.

Q: Why is the AT28C256F-15SC listed as obsolete?

A: Product obsolescence reflects manufacturer discontinuation. The AT28C256F-15SU remains in active production, making it the recommended choice for new designs and ongoing system support.