AT93C56-10SC EEPROM Equivalent & Substitute Parts

Part Overview

The AT93C56-10SC is a 2Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, housed in an 8-SOIC surface mount package. This device implements a 3-Wire Serial interface with a 2 MHz clock frequency and operates across a 4.5V to 5.5V supply voltage range. The part is classified as obsolete, making equivalent and substitute components necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
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	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 AT93C56-10SC is determined by the following critical parameters:

Memory capacity (2Kbit) and organization (256 x 8, 128 x 16)
Physical package compatibility (8-SOIC form factor)
Serial interface protocol (3-Wire Serial or Microwire)
Supply voltage compatibility
Operating temperature range
Write cycle time performance

The substitute parts listed below maintain the same memory capacity, package footprint, and core functionality. However, interface protocol differences exist between 3-Wire Serial (original) and Microwire implementations. Microwire is a superset protocol that can operate in 3-Wire Serial mode through appropriate pin configuration, enabling functional compatibility in most applications.

Parameter Comparison

Parameter	AT93C56-10SC	93AA56/SN	M93C56-RMN3TP/K	M93C56-RMN6TP	M93C56-WMN6P	M93C56-WMN6TP
Manufacturer	Microchip	Microchip	STMicroelectronics	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
Interface Protocol	3-Wire Serial	Microwire	Microwire	Microwire	Microwire	Microwire
Clock Frequency	2 MHz	2 MHz	2 MHz	1 MHz	2 MHz	2 MHz
Write Cycle Time	10ms	10ms	5ms	5ms	5ms	5ms
Voltage Supply Range	4.5V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 125°C	-40°C ~ 85°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

93AA56/SN (Microchip Technology): This part maintains Microchip manufacturer continuity and shares identical memory specifications with the original AT93C56-10SC. It operates across an extended voltage range (1.8V to 5.5V) and is ROHS3 compliant. The Microwire interface is protocol-compatible with 3-Wire Serial operation. Product status is active with verified programmability.

M93C56-RMN3TP/K (STMicroelectronics): This automotive-grade component carries AEC-Q100 qualification and supports an extended operating temperature range (-40°C to 125°C). It features improved write cycle time (5ms versus 10ms) and is ROHS3 compliant. Suitable for applications requiring automotive-grade reliability and wider temperature operation.

M93C56-RMN6TP (STMicroelectronics): An active production part with high inventory availability. Operates at 1 MHz clock frequency (reduced from 2 MHz) with 5ms write cycle time. Temperature range extends to -40°C to 85°C. ROHS3 compliant with verified programmability.

M93C56-WMN6P (STMicroelectronics): Offers the highest inventory availability (5,000,300 pcs) with 2 MHz clock frequency matching the original specification. Minimum supply voltage is 2.5V. Operating temperature range is -40°C to 85°C. ROHS3 compliant. Programmability status is not verified.

M93C56-WMN6TP (STMicroelectronics): Active production part with 2 MHz clock frequency and 5ms write cycle time. Supply voltage range is 2.5V to 5.5V. Operating temperature extends to -40°C to 85°C. ROHS3 compliant with verified programmability.

Frequently Asked Questions (FAQ)

Q: Can Microwire interface parts directly replace the 3-Wire Serial AT93C56-10SC?

A: Microwire protocol is backward compatible with 3-Wire Serial operation through appropriate pin configuration. The substitute parts listed implement Microwire, which supports 3-Wire Serial mode, enabling functional compatibility in most applications. Circuit design review is necessary to confirm pin-level compatibility.

Q: What is the primary difference between the substitute parts?

A: Differences exist in clock frequency (1 MHz versus 2 MHz), write cycle time (5ms versus 10ms), supply voltage range minimums (1.8V, 2.5V), operating temperature ranges, and manufacturer (Microchip versus STMicroelectronics). All maintain identical 2Kbit memory capacity and 8-SOIC package footprint.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant. The original AT93C56-10SC is RoHS non-compliant, making substitution necessary for applications requiring RoHS compliance.

Q: Which substitute part offers the best temperature range coverage?

A: The M93C56-RMN3TP/K supports the widest operating temperature range (-40°C to 125°C) and includes automotive-grade AEC-Q100 qualification.

Q: Does clock frequency reduction affect compatibility?

A: The M93C56-RMN6TP operates at 1 MHz versus the original 2 MHz. This reduced frequency is compatible with applications designed for the original 2 MHz specification, as it represents a conservative operational mode. Applications with strict timing requirements should confirm compatibility with system-level timing analysis.

Q: What packaging options are available?

A: Substitute parts are available in Tube, Tape & Reel (TR), and Cut Tape (CT) & Digi-Reel packaging formats. Selection depends on production volume and assembly process requirements.

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