AT28BV256-20PC Equivalent & Substitute Parts

Part Overview

The AT28BV256-20PC is a 256Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 28-DIP package with 200 ns access time. This component is classified as obsolete, indicating discontinued production and limited availability in the market. Finding equivalent substitute parts is necessary to support ongoing system maintenance, repairs, and new designs where this legacy component is specified.

Substiute Parts

AT28BV256-20PC

Microchip TechnologyIn Stock: 1037AT28BV256-20PC Datasheet

Current PartRFQ

AT28BV256-20SU

Microchip TechnologyIn Stock: 1000302AT28BV256-20SU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AT28BV256-20PC is determined by strict equivalence in core electrical and functional parameters. The following criteria establish valid substitutes:

• Memory capacity: 256Kbit (32K x 8 organization)
• Memory type: Non-volatile EEPROM technology
• Interface: Parallel access
• Access time: 200 ns
• Supply voltage: 2.7V ~ 3.6V
• Write cycle time: 10ms
• Manufacturer: Microchip Technology (AT28BV256 base product family)

The AT28BV256-20SU qualifies as a direct electrical and functional substitute, with the primary difference being the package type (28-SOIC surface mount versus 28-DIP through-hole) and operating temperature range extension.

Parameter Comparison

Engineering Selection Recommendations

The AT28BV256-20SU is the manufacturer-recommended substitute for the AT28BV256-20PC. Selection between these parts depends on application constraints:

AT28BV256-20SU is appropriate when:

• New designs or redesigns are being implemented
• Surface mount assembly processes are available
• Extended operating temperature range (-40°C ~ 85°C) is required
• RoHS3 compliance is mandated
• Active product availability is critical for supply chain continuity

AT28BV256-20PC remains applicable when:

• Through-hole mounting is required by existing PCB designs
• Legacy system repairs demand pin-compatible replacement
• Operating temperature range is limited to 0°C ~ 70°C
• Existing inventory stock is available

Both parts share identical electrical specifications and memory organization, ensuring functional equivalence in parallel EEPROM applications.

Frequently Asked Questions (FAQ)

Q: Can AT28BV256-20SU directly replace AT28BV256-20PC in existing designs?

A: Electrical and functional replacement is direct. However, the package change from 28-DIP to 28-SOIC requires PCB redesign. The parts are not pin-compatible for direct socket substitution.

Q: What is the primary difference between these two parts?

A: The main differences are package type (through-hole DIP versus surface-mount SOIC), operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C), and RoHS compliance status. All memory specifications and electrical parameters are identical.

Q: Why is AT28BV256-20PC classified as obsolete?

A: The AT28BV256-20PC is obsolete due to discontinued manufacturing by Microchip Technology. The AT28BV256-20SU represents the active product line continuation with improved compliance and extended operating specifications.

Q: Are there other manufacturers offering equivalent 256Kbit parallel EEPROM devices?

A: This document addresses substitutes within the Microchip Technology AT28BV256 product family. Cross-manufacturer equivalents are outside the scope of this reference.

Q: What is the impact of the RoHS compliance difference?

A: The AT28BV256-20PC is RoHS non-compliant, while AT28BV256-20SU is ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the AT28BV256-20SU is the required selection.

Q: Can the extended temperature range of AT28BV256-20SU be used in place of the standard range?

A: Yes. The AT28BV256-20SU operating range (-40°C ~ 85°C) encompasses the AT28BV256-20PC range (0°C ~ 70°C), making it suitable for any application within the original temperature specification.