AT28BV256-20SC Equivalent & Substitute Parts Engineering Reference

Part Overview

The AT28BV256-20SC from Microchip Technology is a non-volatile EEPROM memory IC featuring 256Kbit, organized as 32K x 8, and utilizes a parallel interface. It comes in a 28-SOIC surface-mount package and provides an access time of 200 ns. The device operates within a voltage range of 2.7V to 3.6V and supports a write cycle time of 10 ms per word or page. This product is classified as obsolete and does not meet RoHS compliance, making it necessary for engineers to identify suitable substitute models to ensure ongoing product support and production.

Substiute Parts

AT28BV256-20SC

Microchip TechnologyIn Stock: 1078AT28BV256-20SC Datasheet

Current PartRFQ

AT28BV256-20SU

Microchip TechnologyIn Stock: 1000302AT28BV256-20SU Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution is possible when all key electrical and mechanical parameters match or exceed the requirements of the original part. The strictly assessed parameters for equivalency include: memory type, format, size, organization, interface, write cycle time, access time, voltage supply range, operating temperature, mounting type, package dimensions, compliance statuses (RoHS, REACH), and product status. All substitutes must conform to these stated requirements.

Parameter Comparison

Engineering Selection Recommendations

The AT28BV256-20SC is obsolete and RoHS non-compliant, while the AT28BV256-20SU is active and ROHS3 compliant. Both parts share identical electrical and mechanical key parameters, including memory size, organization, timing characteristics, voltage supply, mounting type, and package format. Compliance with RoHS and current product status support direct substitution for applications requiring regulatory adherence and ongoing availability.

Frequently Asked Questions (FAQ)

Q1: What are the main criteria for substituting AT28BV256-20SC with AT28BV256-20SU?
A1: Substitution is determined by identical memory type, size, organization, parallel interface, access and write cycle times, voltage range, mounting type, package dimensions, and compliance statuses.

Q2: Will the package and pinout be compatible for direct replacement?
A2: Both AT28BV256-20SC and AT28BV256-20SU use the same 28-SOIC package (0.295", 7.50mm width) and supplier device package, ensuring mechanical and layout compatibility.

Q3: Does the substitute part support a wider operating temperature range?
A3: The AT28BV256-20SU supports -40°C ~ 85°C (TC), which encompasses and exceeds the 0°C ~ 70°C (TC) range specified for the AT28BV256-20SC.

Q4: Is the substitute part compliant with current RoHS regulations?
A4: The AT28BV256-20SU is ROHS3 compliant, whereas the AT28BV256-20SC is RoHS non-compliant.

Q5: What is the difference in moisture sensitivity levels (MSL)?
A5: The AT28BV256-20SC carries an MSL of 2 (1 year), while the AT28BV256-20SU has an MSL of 3 (168 hours). Suitable handling procedures should be followed according to the stated MSL ratings.

Q6: Is continued supply assured for the substitute part?
A6: The AT28BV256-20SU is listed as active, supporting ongoing availability for assembly and production requirements.