AT93C57-10SC EEPROM 2Kbit 3-Wire Serial Equivalent & Substitute Parts

Part Overview

The AT93C57-10SC is a 2Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring 3-Wire Serial interface operation at 2 MHz. This component is classified as obsolete and is no longer in active production. Due to its discontinued status, equivalent substitute parts with compatible electrical and mechanical specifications are necessary for ongoing system support, maintenance, and new design implementations requiring equivalent functionality.

Key Parameters

Parameter	AT93C57-10SC
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	4.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

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

Mandatory Compatibility Parameters:

Memory Size: 2Kbit
Memory Organization: 256 x 8, 128 x 16
Package / Case: 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Surface Mount
Memory Type: Non-Volatile EEPROM

Interface Compatibility Consideration: The AT93C57-10SC uses 3-Wire Serial interface. Substitute parts listed use Microwire interface, which is functionally compatible with 3-Wire Serial protocol for this memory category, allowing direct substitution at the application level.

Electrical Operating Range: Substitute parts must support the application's voltage and temperature requirements. Parts with wider voltage ranges (1.8V ~ 5.5V) and extended temperature ranges (-40°C ~ 125°C) provide enhanced flexibility for diverse operating environments.

Parameter Comparison

Parameter	AT93C57-10SC	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	4.5V ~ 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
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Standard Industrial Applications: The 93AA56/SN and 93LC56/SN from Microchip Technology maintain manufacturer continuity and are direct active-production alternatives. Both are ROHS3 compliant and support the required 2Kbit memory capacity with identical memory organization. These parts are suitable for applications operating within the 0°C ~ 70°C temperature range.

For Extended Temperature and Automotive Applications: The M93C56-RMN3TP/K, M93C56-RMN6TP, and M93C56-WMN6TP from STMicroelectronics provide extended operating temperature ranges and are ROHS3 compliant. The M93C56-RMN3TP/K carries AEC-Q100 automotive qualification and supports temperatures to -40°C ~ 125°C. The M93C56-RMN6TP and M93C56-WMN6TP support -40°C ~ 85°C operation.

For Moisture-Sensitive Environments: The M93C56 series (RMN3TP/K, RMN6TP, WMN6TP) feature MSL rating of 1 (Unlimited), compared to MSL rating of 3 (168 Hours) for the 93AA56/SN and 93LC56/SN, providing superior moisture resistance for storage and handling.

Clock Frequency Consideration: The M93C56-RMN6TP operates at 1 MHz, compared to 2 MHz for all other substitutes. Applications requiring 2 MHz operation should select 93AA56/SN, 93LC56/SN, M93C56-RMN3TP/K, or M93C56-WMN6TP.

Frequently Asked Questions (FAQ)

Q: Can the AT93C57-10SC be directly replaced with the 93AA56/SN or 93LC56/SN? A: Yes. Both parts share identical memory capacity (2Kbit), memory organization (256 x 8, 128 x 16), 8-SOIC package, and 2 MHz clock frequency. The Microwire interface is functionally compatible with the 3-Wire Serial protocol for this memory category. Both are active-production parts from Microchip Technology.

Q: What is the difference between the M93C56-RMN6TP and M93C56-WMN6TP? A: Both are STMicroelectronics M93C56 variants in 8-SOIC package with 2 MHz operation and 5ms write cycle time. The primary difference is packaging format: M93C56-RMN6TP is supplied in Tape & Reel (TR), while M93C56-WMN6TP is supplied in Cut Tape (CT) & Digi-Reel. Electrical specifications are equivalent.

Q: Why does the M93C56-RMN6TP operate at 1 MHz instead of 2 MHz? A: The M93C56-RMN6TP is specified for 1 MHz clock frequency. For applications requiring 2 MHz operation, select M93C56-RMN3TP/K or M93C56-WMN6TP instead.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts (93AA56/SN, 93LC56/SN, M93C56-RMN3TP/K, M93C56-RMN6TP, M93C56-WMN6TP) are ROHS3 compliant. The original AT93C57-10SC is RoHS non-compliant.

Q: Which substitute part is suitable for automotive applications? A: The M93C56-RMN3TP/K is qualified to AEC-Q100 automotive standard and supports extended temperature operation from -40°C to 125°C, making it suitable for automotive-grade applications.

Q: What is the significance of MSL rating differences? A: MSL (Moisture Sensitivity Level) rating indicates moisture sensitivity during storage and handling. MSL 1 (Unlimited) allows indefinite storage without baking, while MSL 3 (168 Hours) requires baking if storage exceeds 168 hours in high-humidity conditions. The M93C56 series offers superior moisture resistance with MSL 1 rating.

Q: Can I use a substitute part with a wider voltage range than the original specification? A: Yes. Parts with wider voltage ranges (such as 1.8V ~ 5.5V) are backward compatible with applications designed for the original 4.5V ~ 5.5V range. The wider range provides flexibility for multi-voltage system designs.

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