AT28BV64-30SC EEPROM Equivalent & Substitute Parts

Part Overview

The AT28BV64-30SC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology in a 28-SOIC package. This device provides non-volatile memory storage with a 300 ns access time and operates across a 2.7V to 3.6V supply voltage range. The part is currently classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	Parallel
Access Time	300 ns
Write Cycle Time	3 ms
Voltage Supply Range	2.7V ~ 3.6V
Operating Temperature	0°C ~ 70°C
Package Type	28-SOIC
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the AT28BV64-30SC is determined by the following critical parameters:

Memory Capacity & Organization: Substitute parts must maintain 64Kbit capacity with 8K x 8 organization to ensure pin-compatible operation and identical address/data bus requirements.
Package & Pinout: The 28-SOIC package is mandatory for mechanical and electrical compatibility with existing PCB layouts.
Memory Interface: Parallel interface operation is required to maintain functional equivalence with the original design.
Voltage Supply Range: Substitute parts must support the 2.7V to 3.6V supply voltage specification.
Access Time: Substitute parts with equal or faster access times (≤300 ns) are electrically compatible.

The AT28BV64B-20SU meets all substitution criteria, offering improved performance characteristics while maintaining full compatibility with the AT28BV64-30SC electrical and mechanical specifications.

Parameter Comparison

Parameter	AT28BV64-30SC (Main Part)	AT28BV64B-20SU (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Memory Size	64Kbit	64Kbit
Memory Organization	8K x 8	8K x 8
Memory Interface	Parallel	Parallel
Access Time	300 ns	200 ns
Write Cycle Time	3 ms	10 ms
Voltage Supply Range	2.7V ~ 3.6V	2.7V ~ 3.6V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Package Type	28-SOIC	28-SOIC
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The AT28BV64B-20SU is the direct substitute for the AT28BV64-30SC based on the following factors:

Product Status: The AT28BV64B-20SU maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete AT28BV64-30SC.
Regulatory Compliance: The substitute part is ROHS3 compliant, meeting current environmental and regulatory requirements, whereas the original part is non-compliant.
Performance Enhancement: The AT28BV64B-20SU provides faster access time (200 ns versus 300 ns), delivering improved read performance while maintaining full electrical compatibility.
Extended Temperature Range: The substitute supports -40°C to 85°C operation, providing broader thermal operating capability than the original 0°C to 70°C range.
Pin Compatibility: Both parts utilize the identical 28-SOIC package with matching pinout, enabling direct replacement without PCB modification.

Frequently Asked Questions (FAQ)

Q: Can the AT28BV64B-20SU be used as a direct replacement for the AT28BV64-30SC?

A: Yes. Both parts share identical memory capacity (64Kbit), organization (8K x 8), parallel interface, supply voltage range (2.7V to 3.6V), and 28-SOIC package configuration. The substitute offers faster access time and extended temperature range, making it functionally superior while maintaining full compatibility.

Q: What are the key differences between these two parts?

A: The primary differences are access time (200 ns versus 300 ns), write cycle time (10 ms versus 3 ms), operating temperature range (-40°C to 85°C versus 0°C to 70°C), product status (active versus obsolete), and RoHS compliance (ROHS3 compliant versus non-compliant).

Q: Are there any package or pinout differences?

A: No. Both the AT28BV64-30SC and AT28BV64B-20SU use the 28-SOIC package with identical pinout. No PCB layout modifications are required for substitution.

Q: Does the faster access time of the substitute part affect system compatibility?

A: No. Faster access time is a performance enhancement that maintains backward compatibility. Systems designed for 300 ns access time operate correctly with 200 ns components.

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

A: The AT28BV64B-20SU is ROHS3 compliant, meeting current environmental regulations for hazardous substance restrictions. The original part is non-compliant, which may restrict its use in new designs or regulated applications.

Q: Can the AT28BV64-30SC be used in new designs?

A: The AT28BV64-30SC is obsolete and not recommended for new designs. The AT28BV64B-20SU is the active production alternative and should be specified for all new applications.

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