AT93C57-10PI Equivalent & Substitute Parts

Part Overview

The AT93C57-10PI is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring a 3-Wire Serial interface and 2 MHz clock frequency. This device is designed for non-volatile data storage applications requiring through-hole mounting in an 8-DIP package. The part is currently listed as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	2Kbit
Memory Organization	256 x 8, 128 x 16
Memory Interface	3-Wire Serial
Clock Frequency	2 MHz
Write Cycle Time	10ms
Supply Voltage	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the AT93C57-10PI is determined by the following critical parameters:

Memory Capacity: 2Kbit capacity with 256 x 8 or 128 x 16 organization
Package Compatibility: 8-DIP through-hole form factor matching the original 0.300" (7.62mm) spacing
Interface Protocol: Serial communication interface (3-Wire Serial or Microwire compatible)
Supply Voltage Range: Operating voltage window that encompasses or exceeds the original 4.5V ~ 5.5V specification
Temperature Range: Operating temperature range of -40°C ~ 85°C
Non-Volatile Memory Type: EEPROM technology for data retention

The 93AA56C-I/P qualifies as a direct substitute based on matching memory capacity, identical package configuration, compatible serial interface protocol, and overlapping electrical specifications.

Parameter Comparison

Parameter	AT93C57-10PI	93AA56C-I/P	Compatibility
Memory Type	EEPROM	EEPROM	Match
Memory Size	2Kbit	2Kbit	Match
Memory Organization	256 x 8, 128 x 16	256 x 8, 128 x 16	Match
Memory Interface	3-Wire Serial	Microwire	Compatible
Clock Frequency	2 MHz	3 MHz	Compatible (higher)
Write Cycle Time	10ms	6ms	Compatible (faster)
Supply Voltage	4.5V ~ 5.5V	1.8V ~ 5.5V	Compatible (wider range)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Match
Package Type	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	Match
Mounting Type	Through Hole	Through Hole	Match
Product Status	Obsolete	Active	Substitute is active
RoHS Status	Non-compliant	ROHS3 Compliant	Substitute is compliant

Engineering Selection Recommendations

The 93AA56C-I/P is a suitable substitute for the obsolete AT93C57-10PI based on the following factors:

Electrical Compatibility: The substitute maintains identical memory capacity, organization, and operating temperature range. The 93AA56C-I/P features a wider supply voltage range (1.8V ~ 5.5V) that fully encompasses the original specification window, providing enhanced flexibility for power supply design.

Interface Compatibility: Both devices employ serial communication protocols (3-Wire Serial and Microwire) that are functionally compatible for data transfer operations. The 93AA56C-I/P operates at 3 MHz clock frequency, exceeding the original 2 MHz specification, and provides faster write cycle time (6ms versus 10ms), resulting in improved performance characteristics.

Package and Mounting: Identical 8-DIP through-hole package configuration ensures direct mechanical and electrical compatibility with existing PCB layouts and socket designs.

Compliance Status: The 93AA56C-I/P holds active product status and ROHS3 compliance certification, addressing regulatory requirements and ensuring long-term availability compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can the 93AA56C-I/P directly replace the AT93C57-10PI without firmware modifications?

A: The 93AA56C-I/P is pin-compatible and functionally equivalent for memory capacity and organization. Both devices use serial communication protocols (3-Wire Serial and Microwire) that are compatible. However, firmware verification is necessary to confirm protocol compatibility with the specific application controller implementation.

Q: What is the difference between 3-Wire Serial and Microwire interfaces?

A: Both protocols are serial communication standards for EEPROM devices. Microwire is a specific implementation of 3-wire serial communication. The 93AA56C-I/P Microwire interface is compatible with systems designed for 3-Wire Serial operation, as the protocol structure and pin functions remain functionally equivalent.

Q: Does the wider supply voltage range of the 93AA56C-I/P affect circuit design?

A: The 93AA56C-I/P operates across 1.8V ~ 5.5V, compared to the original 4.5V ~ 5.5V specification. This wider range provides design flexibility but does not require circuit modifications if the original supply voltage remains within the 4.5V ~ 5.5V window.

Q: Are there any package or pinout differences between these devices?

A: Both devices use identical 8-DIP (0.300", 7.62mm) through-hole packages with matching pinout configurations. Direct socket substitution is mechanically and electrically feasible.

Q: What is the significance of the 93AA56C-I/P being ROHS3 compliant while the original is non-compliant?

A: ROHS3 compliance indicates the substitute part meets current environmental and regulatory standards for hazardous substance restrictions. This is advantageous for new designs and systems requiring regulatory compliance documentation.

Q: How do the write cycle times compare between the two devices?

A: The AT93C57-10PI specifies 10ms write cycle time, while the 93AA56C-I/P provides 6ms write cycle time. The faster write performance of the substitute does not create compatibility issues and may improve overall system performance in write-intensive applications.

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