AT93C57-10SC-2.7 Equivalent & Substitute Parts

Part Overview

The AT93C57-10SC-2.7 is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring 3-Wire Serial interface with 2 MHz clock frequency in 8-SOIC surface mount packaging. This part is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. The 3-Wire Serial interface and specific electrical characteristics define the substitution parameters for this component.

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
Voltage Supply Range	2.7V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the AT93C57-10SC-2.7 is based on the following critical parameters:

Memory capacity: 2Kbit with 256 x 8 or 128 x 16 organization
Package compatibility: 8-SOIC surface mount form factor
Memory interface: Serial communication protocol (3-Wire Serial or Microwire compatible)
Electrical specifications: Supply voltage range and operating temperature envelope
Write cycle performance: 5ms to 10ms acceptable range

The substitute parts listed below maintain these core functional and physical requirements. Microwire interface variants are included as they provide functional compatibility with 3-Wire Serial applications through protocol overlap in the Microchip and STMicroelectronics product families.

Parameter Comparison

Parameter	AT93C57-10SC-2.7	93AA56/SN	93LC56/SN	M93C56-RMN3TP/K	M93C56-RMN6TP	M93C56-WMN6TP
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	STMicroelectronics	STMicroelectronics	STMicroelectronics
Memory Size	2Kbit	2Kbit	2Kbit	2Kbit	2Kbit	2Kbit
Memory Organization	256 x 8, 128 x 16	256 x 8, 128 x 16	256 x 8, 128 x 16	256 x 8, 128 x 16	256 x 8, 128 x 16	256 x 8, 128 x 16
Memory Interface	3-Wire Serial	Microwire	Microwire	Microwire	Microwire	Microwire
Clock Frequency	2 MHz	2 MHz	2 MHz	2 MHz	1 MHz	2 MHz
Write Cycle Time	10ms	10ms	10ms	5ms	5ms	5ms
Voltage Supply Range	2.7V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Microchip Technology):

93AA56/SN and 93LC56/SN are direct Microchip alternatives with active product status and ROHS3 compliance. Both maintain the 2Kbit capacity, 8-SOIC package, and 2 MHz clock frequency. The 93AA56/SN supports extended supply voltage range (1.8V ~ 5.5V), while 93LC56/SN operates from 2.5V ~ 5.5V. Both use Microwire interface, which is functionally compatible with 3-Wire Serial in Microchip's product ecosystem.

Secondary Substitutes (STMicroelectronics):

M93C56-RMN3TP/K, M93C56-RMN6TP, and M93C56-WMN6TP are STMicroelectronics alternatives with extended operating temperature ranges and faster write cycle times (5ms). M93C56-RMN3TP/K includes automotive qualification (AEC-Q100) and operates from -40°C to 125°C. M93C56-RMN6TP operates at 1 MHz clock frequency with -40°C to 85°C range. M93C56-WMN6TP maintains 2 MHz operation with -40°C to 85°C range and 2.5V ~ 5.5V supply voltage.

All substitutes are ROHS3 compliant and maintain the 8-SOIC package form factor. Selection should be based on specific application requirements for operating temperature range, supply voltage constraints, and clock frequency needs.

Frequently Asked Questions (FAQ)

Q: Can 93AA56/SN directly replace AT93C57-10SC-2.7?

A: Yes. Both are 2Kbit EEPROM devices in 8-SOIC packaging with 2 MHz operation. The 93AA56/SN uses Microwire interface, which is compatible with 3-Wire Serial in Microchip applications. The 93AA56/SN is active product status with ROHS3 compliance, addressing the obsolescence of the AT93C57-10SC-2.7.

Q: What is the difference between 93LC56/SN and 93AA56/SN?

A: Both are Microchip 2Kbit EEPROM devices in 8-SOIC with identical memory organization and 2 MHz clock frequency. The primary difference is supply voltage range: 93AA56/SN operates from 1.8V ~ 5.5V, while 93LC56/SN operates from 2.5V ~ 5.5V. Selection depends on minimum supply voltage requirements of the application.

Q: Why do STMicroelectronics M93C56 variants have faster write cycle times?

A: The M93C56 series specifies 5ms write cycle time compared to 10ms for the original AT93C57-10SC-2.7 and Microchip 93AA56/93LC56 variants. This is a product specification difference and represents improved performance. Applications designed for 10ms write cycles will function correctly with 5ms write cycle devices.

Q: Are M93C56-RMN6TP and M93C56-WMN6TP interchangeable?

A: Both are STMicroelectronics M93C56 variants in 8-SOIC packaging with 2Kbit capacity and Microwire interface. M93C56-RMN6TP operates at 1 MHz clock frequency, while M93C56-WMN6TP operates at 2 MHz. Selection depends on clock frequency requirements. M93C56-WMN6TP is preferred for applications requiring 2 MHz operation to match the original AT93C57-10SC-2.7 specification.

Q: Is M93C56-RMN3TP/K suitable for automotive applications?

A: Yes. M93C56-RMN3TP/K includes AEC-Q100 automotive qualification and operates from -40°C to 125°C, making it suitable for automotive temperature ranges. This variant is recommended for applications requiring extended temperature operation and automotive compliance.

Q: What packaging options are available for these substitutes?

A: All substitute parts are supplied in 8-SOIC surface mount package. Packaging formats vary: 93AA56/SN and 93LC56/SN are supplied in Tube; M93C56-RMN3TP/K and M93C56-WMN6TP are supplied in Cut Tape (CT) & Digi-Reel; M93C56-RMN6TP is supplied in Tape & Reel (TR). Packaging selection does not affect electrical or functional compatibility.

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