AT28C64-25PC Equivalent & Substitute Parts

Part Overview

The AT28C64-25PC is a 64Kbit parallel EEPROM memory IC manufactured by Microchip Technology, housed in a 28-DIP package with 250 ns access time. This part is classified as obsolete, which necessitates identification of functionally compatible alternatives for ongoing system support and new designs. The AT28C64-25PC operates within the 4.5V to 5.5V supply voltage range and supports 8K x 8 memory organization with parallel interface architecture.

Key Parameters

Parameter	Value
Memory Size	64Kbit
Memory Organization	8K x 8
Memory Interface	Parallel
Access Time	250 ns
Write Cycle Time	1 ms
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	28-DIP (0.600", 15.24mm)
Mounting Type	Through Hole
Memory Type	Non-Volatile EEPROM

Substitute Part Grouping Explanation

Substitution of the AT28C64-25PC is determined by the following critical parameters:

Memory capacity (64Kbit) and organization (8K x 8)
Parallel interface architecture
Package form factor (28-DIP)
Supply voltage compatibility (4.5V ~ 5.5V)
Physical pin configuration and mounting type (Through Hole)

The AT28C64B-15PU qualifies as a direct substitute based on matching memory size, organization, interface type, package, and voltage specifications. This substitute maintains full electrical and mechanical compatibility while offering improved performance characteristics and active product status.

Parameter Comparison

Parameter	AT28C64-25PC	AT28C64B-15PU
Memory Size	64Kbit	64Kbit
Memory Organization	8K x 8	8K x 8
Memory Interface	Parallel	Parallel
Access Time	250 ns	150 ns
Write Cycle Time	1 ms	10 ms
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Package Type	28-DIP (0.600", 15.24mm)	28-DIP (0.600", 15.24mm)
Mounting Type	Through Hole	Through Hole
Memory Type	Non-Volatile EEPROM	Non-Volatile EEPROM
Product Status	Obsolete	Active
RoHS Compliance	Non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The AT28C64B-15PU is the qualified substitute for the AT28C64-25PC. Selection of this alternative is supported by:

Active product status, ensuring continued availability and manufacturing support
ROHS3 compliance, meeting current environmental and regulatory requirements
Verified programmability status, confirming functional compatibility
Identical memory capacity, organization, interface type, and package configuration
Expanded operating temperature range (-40°C to 85°C versus 0°C to 70°C), providing broader application flexibility
Improved access time performance (150 ns versus 250 ns)

The AT28C64B-15PU operates within the same supply voltage specification and maintains full pin-for-pin compatibility with the original part.

Frequently Asked Questions (FAQ)

Q: Can the AT28C64B-15PU be used as a direct replacement for the AT28C64-25PC?

A: Yes. Both parts share identical memory capacity (64Kbit), organization (8K x 8), parallel interface, supply voltage range (4.5V ~ 5.5V), and 28-DIP package configuration. Pin-for-pin compatibility is maintained.

Q: What are the performance differences between these parts?

A: The AT28C64B-15PU offers faster access time (150 ns versus 250 ns) and an extended operating temperature range (-40°C to 85°C versus 0°C to 70°C). Write cycle time differs (10 ms versus 1 ms), which may affect programming speed in specific applications.

Q: Is the AT28C64B-15PU suitable for new designs?

A: Yes. The AT28C64B-15PU carries active product status and ROHS3 compliance, making it appropriate for new development and long-term production requirements.

Q: Are there package or mounting differences?

A: No. Both parts use 28-DIP (0.600", 15.24mm) through-hole packages with identical physical dimensions and pin configurations.

Q: What is the inventory status of the substitute part?

A: The AT28C64B-15PU has 3308 pieces in stock as new original inventory, packaged in tubes.

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