AT93C57W-10SC-2.7 Equivalent & Substitute Parts

Part Overview

The AT93C57W-10SC-2.7 is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring a 3-Wire Serial interface with 2 MHz clock frequency in an 8-SOIC surface mount package. This device is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. The part operates across a 2.7V to 5.5V supply voltage range with a 10ms write cycle time and is rated for 0°C to 70°C operating temperature.

Key Parameters

Parameter	Value
Memory Size	2Kbit
Memory Format	EEPROM
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
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the AT93C57W-10SC-2.7 is determined by the following critical parameters: 2Kbit memory capacity, EEPROM non-volatile memory format, 256 x 8 or 128 x 16 memory organization, 2 MHz clock frequency, 8-SOIC package footprint, and surface mount mounting type. The memory interface differs between the main part (3-Wire Serial) and available substitutes (Microwire), which represents a functional protocol difference. Voltage supply range and operating temperature specifications must be evaluated for application compatibility. Write cycle time and RoHS compliance status are secondary considerations for substitution suitability.

Parameter Comparison

Parameter	AT93C57W-10SC-2.7	93AA56/SN	M93C56-WMN6TP
Manufacturer	Microchip Technology	Microchip Technology	STMicroelectronics
Memory Size	2Kbit	2Kbit	2Kbit
Memory Format	EEPROM	EEPROM	EEPROM
Memory Organization	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
Clock Frequency	2 MHz	2 MHz	2 MHz
Write Cycle Time	10ms	10ms	5ms
Voltage Supply Range	2.7V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

Both substitute parts are classified as active products with ROHS3 compliance, addressing the obsolescence status of the AT93C57W-10SC-2.7. The 93AA56/SN maintains identical operating temperature range (0°C ~ 70°C) and write cycle time (10ms) as the original part, with broader voltage supply compatibility (1.8V ~ 5.5V). The M93C56-WMN6TP offers extended operating temperature range (-40°C ~ 85°C), faster write cycle time (5ms), and unlimited moisture sensitivity rating, with voltage supply range of 2.5V ~ 5.5V. Both substitutes employ Microwire interface protocol rather than 3-Wire Serial, requiring interface protocol verification in the target application. Selection between substitutes depends on application temperature requirements, write cycle performance needs, and interface protocol compatibility with existing system design.

Frequently Asked Questions (FAQ)

Q: Can the 93AA56/SN and M93C56-WMN6TP directly replace the AT93C57W-10SC-2.7 without circuit modification?

A: Both parts share identical memory capacity (2Kbit), memory organization (256 x 8, 128 x 16), clock frequency (2 MHz), and 8-SOIC package footprint. However, the memory interface protocol differs: the original part uses 3-Wire Serial while substitutes use Microwire. Direct replacement requires interface protocol compatibility verification in the application circuit.

Q: What are the voltage supply differences between the three parts?

A: The AT93C57W-10SC-2.7 operates at 2.7V ~ 5.5V. The 93AA56/SN extends the lower limit to 1.8V, providing broader compatibility with lower-voltage systems. The M93C56-WMN6TP operates at 2.5V ~ 5.5V, suitable for standard 3.3V and 5V applications.

Q: Which substitute part is recommended for extended temperature applications?

A: The M93C56-WMN6TP supports -40°C ~ 85°C operating temperature, compared to 0°C ~ 70°C for both the original part and the 93AA56/SN. Selection depends on specific application temperature requirements.

Q: What is the significance of the write cycle time difference?

A: The AT93C57W-10SC-2.7 and 93AA56/SN both specify 10ms write cycle time. The M93C56-WMN6TP offers 5ms write cycle time, providing faster write operations for applications requiring higher data throughput.

Q: Are there RoHS compliance considerations for these substitutes?

A: The original AT93C57W-10SC-2.7 is RoHS non-compliant. Both substitute parts (93AA56/SN and M93C56-WMN6TP) are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and production.

Q: What is the difference in moisture sensitivity between the parts?

A: The AT93C57W-10SC-2.7 and M93C56-WMN6TP both have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. The 93AA56/SN has MSL 3 (168 Hours), requiring controlled storage and handling conditions during manufacturing.

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