Equivalent & Substitute Parts for 93AA56X/SN

Part Overview

The 93AA56X/SN is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 8-SOIC surface mount packaging. This part operates across a supply voltage range of 1.8V to 5.5V with a 2 MHz clock frequency and 10ms write cycle time. The 93AA56X/SN is classified as obsolete, necessitating identification of functionally equivalent active alternatives to support ongoing design requirements and procurement needs.

Key Parameters

Parameter	93AA56X/SN
Memory Size	2Kbit
Memory Organization	256 x 8, 128 x 16
Memory Interface	Microwire
Clock Frequency	2 MHz
Write Cycle Time	10ms
Voltage Supply Range	1.8V ~ 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 eligibility is determined by strict alignment with the following critical parameters:

Memory Size: 2Kbit (exact match required)
Memory Organization: 256 x 8, 128 x 16 (exact match required)
Memory Interface: Microwire protocol (exact match required)
Package / Case: 8-SOIC form factor (exact match required)
Voltage Supply Range: Minimum 1.8V support (required for compatibility)
Mounting Type: Surface Mount (exact match required)

Substitute parts are grouped into two categories based on interface protocol compatibility:

Category A: Microwire Interface (Direct Substitutes) Parts maintaining identical Microwire protocol: 93AA56-I/SN, 93AA56/SN, 93AA56C-I/SN, 93AA56CX-I/SN, M93C56-RMN3TP/K, M93C56-RMN6TP, M93C56-WMN6P, M93C56-WMN6TP

Category B: 3-Wire Serial Interface (Protocol Variant) Parts with different serial interface protocol: AT93C46DN-SH-B (1Kbit, 3-Wire), AT93C56B-SSHM-B (2Kbit, 3-Wire)

Category B parts require circuit-level interface modifications and are not pin-compatible direct substitutes.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Memory Interface	Clock Frequency	Write Cycle Time	Voltage Supply	Operating Temperature	Product Status	MSL Rating
93AA56X/SN	Microchip	2Kbit	Microwire	2 MHz	10ms	1.8V ~ 5.5V	0°C ~ 70°C	Obsolete	1
93AA56-I/SN	Microchip	2Kbit	Microwire	2 MHz	10ms	1.8V ~ 5.5V	-40°C ~ 85°C	Active	1
93AA56/SN	Microchip	2Kbit	Microwire	2 MHz	10ms	1.8V ~ 5.5V	0°C ~ 70°C	Active	3
93AA56C-I/SN	Microchip	2Kbit	Microwire	3 MHz	6ms	1.8V ~ 5.5V	-40°C ~ 85°C	Active	1
93AA56CX-I/SN	Microchip	2Kbit	Microwire	3 MHz	6ms	1.8V ~ 5.5V	-40°C ~ 85°C	Active	1
M93C56-RMN3TP/K	STMicroelectronics	2Kbit	Microwire	2 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 125°C	Active	1
M93C56-RMN6TP	STMicroelectronics	2Kbit	Microwire	1 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	Active	1
M93C56-WMN6P	STMicroelectronics	2Kbit	Microwire	2 MHz	5ms	2.5V ~ 5.5V	-40°C ~ 85°C	Active	1
M93C56-WMN6TP	STMicroelectronics	2Kbit	Microwire	2 MHz	5ms	2.5V ~ 5.5V	-40°C ~ 85°C	Active	1
AT93C46DN-SH-B	Microchip	1Kbit	3-Wire Serial	2 MHz	5ms	1.8V ~ 5.5V	-40°C ~ 85°C	Active	1
AT93C56B-SSHM-B	Microchip	2Kbit	3-Wire Serial	2 MHz	5ms	1.7V ~ 5.5V	-40°C ~ 85°C	Active	3

Engineering Selection Recommendations

Primary Substitutes (Microwire Interface, Active Status)

For direct replacement with identical electrical interface and protocol:

93AA56-I/SN: Microchip active part with extended operating temperature range (-40°C ~ 85°C) and verified programmability. Recommended for applications requiring temperature margin beyond original 0°C ~ 70°C specification.
93AA56/SN: Microchip active part maintaining original 0°C ~ 70°C temperature range. Suitable for thermal profile compatibility with original design. MSL rating 3 requires moisture control during storage and assembly.
93AA56C-I/SN: Microchip active part with enhanced 3 MHz clock frequency and reduced 6ms write cycle time. Applicable where performance improvement is acceptable and circuit timing permits higher clock operation.
M93C56-RMN3TP/K: STMicroelectronics automotive-grade part (AEC-Q100 qualified) with extended temperature range to 125°C. Suitable for automotive or high-temperature applications. MSL 1 rating provides unlimited moisture tolerance.
M93C56-RMN6TP: STMicroelectronics active part with 1 MHz clock frequency. Applicable where lower clock speed is compatible with system timing requirements.
M93C56-WMN6P / M93C56-WMN6TP: STMicroelectronics active parts with 2.5V minimum supply voltage. Verify circuit design supports this higher minimum voltage threshold before selection.

Secondary Substitutes (3-Wire Serial Interface)

AT93C56B-SSHM-B: 2Kbit 3-Wire serial interface. Requires circuit redesign for interface protocol conversion. Not recommended as direct pin-compatible substitute.
AT93C46DN-SH-B: 1Kbit 3-Wire serial interface. Memory capacity reduction and protocol change require significant circuit modification. Not suitable for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can 93AA56-I/SN directly replace 93AA56X/SN without circuit modification?

A: Yes. Both parts maintain identical 2Kbit Microwire interface, 8-SOIC package, and 1.8V ~ 5.5V supply voltage range. The primary difference is product status (active vs. obsolete) and extended operating temperature range on the -I/SN variant. No circuit modification is required.

Q: What is the difference between Microchip 93AA56 variants and STMicroelectronics M93C56 variants?

A: Both manufacturers produce 2Kbit Microwire EEPROM devices in 8-SOIC packaging with compatible electrical interfaces. Key differences include write cycle time (Microchip 10ms vs. STMicroelectronics 5ms), supply voltage minimums (Microchip 1.8V vs. STMicroelectronics 1.8V or 2.5V depending on variant), and temperature ratings. Verify specific timing and voltage requirements before selection.

Q: Why are AT93C56B-SSHM-B and AT93C46DN-SH-B listed as substitutes if they use different interface protocols?

A: These parts are listed as protocol variants within the substitute ecosystem but are not direct pin-compatible replacements. They require circuit-level interface modifications to implement 3-Wire serial protocol instead of Microwire. Selection of these parts necessitates design review and validation.

Q: What does MSL rating mean and why does it matter?

A: Moisture Sensitivity Level (MSL) indicates moisture absorption tolerance during storage and assembly. MSL 1 (unlimited) parts have no moisture exposure restrictions. MSL 3 (168 hours) parts require controlled humidity storage and have time-limited exposure windows after packaging opening. Verify manufacturing process capabilities before selecting MSL 3 parts.

Q: Can I use 93AA56C-I/SN as a drop-in replacement if my circuit operates at 2 MHz?

A: Yes. The 93AA56C-I/SN operates at 3 MHz, which is backward compatible with 2 MHz circuit timing. The part will function correctly at lower clock frequencies. The reduced 6ms write cycle time provides performance margin but does not affect compatibility.

Q: Which substitute offers the widest operating temperature range?

A: M93C56-RMN3TP/K (STMicroelectronics automotive grade) operates from -40°C to 125°C, providing the widest temperature coverage. This part is AEC-Q100 qualified for automotive applications.

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