AT93C46R-10SC EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AT93C46R-10SC is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring 3-Wire Serial interface and 2 MHz clock frequency in an 8-SOIC surface mount package. This part is currently listed as obsolete, which necessitates identification of functionally equivalent substitute components for ongoing design support and production continuity. The part operates within a 4.5V to 5.5V supply voltage range and supports 128 x 8 or 64 x 16 memory organization.

Key Parameters

Parameter	Value
Memory Size	1Kbit
Memory Format	EEPROM
Memory Organization	128 x 8, 64 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
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AT93C46R-10SC is determined by the following critical parameters:

Memory Size: Must be 1Kbit
Memory Format: Must be EEPROM
Package / Case: Must be 8-SOIC (0.154", 3.90mm Width)
Mounting Type: Must be Surface Mount
Clock Frequency: Must be 2 MHz
Memory Interface: Must support 3-Wire Serial or Microwire protocol (both are compatible serial interfaces for this memory class)

The substitute parts identified maintain these core electrical and mechanical specifications. Variations in supply voltage range, operating temperature, write cycle time, and product status are secondary considerations that do not prevent functional substitution but may affect application suitability.

Parameter Comparison

Parameter	AT93C46R-10SC	AT93C46DN-SH-B	CAV93C46VE-GT3	M93C46-RMN3TP/K	M93C46-WMN6TP
Manufacturer	Microchip Technology	Microchip Technology	onsemi	STMicroelectronics	STMicroelectronics
Memory Size	1Kbit	1Kbit	1Kbit	1Kbit	1Kbit
Memory Organization	128 x 8, 64 x 16	128 x 8, 64 x 16	128 x 8	128 x 8, 64 x 16	128 x 8, 64 x 16
Memory Interface	3-Wire Serial	3-Wire Serial	Microwire	Microwire	Microwire
Clock Frequency	2 MHz	2 MHz	2 MHz	2 MHz	2 MHz
Write Cycle Time	10ms	5ms	Not specified	5ms	5ms
Voltage Supply Range	4.5V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All identified substitute parts maintain the core electrical and mechanical specifications required for functional equivalence to the AT93C46R-10SC. Selection among these alternatives should be based on the following criteria:

AT93C46DN-SH-B (Microchip Technology): This part is the direct manufacturer equivalent from Microchip Technology with active product status and ROHS3 compliance. It maintains the 3-Wire Serial interface identical to the original part and offers improved write cycle time (5ms versus 10ms). Extended operating temperature range (-40°C to 85°C) and wider supply voltage support (1.8V to 5.5V) provide greater design flexibility.

CAV93C46VE-GT3 (onsemi): This part features automotive-grade qualification (AEC-Q100) and the widest operating temperature range (-40°C to 125°C). It uses Microwire interface protocol and supports 2.5V to 5.5V supply voltage. Suitable for applications requiring automotive-grade components.

M93C46-RMN3TP/K (STMicroelectronics): This part offers automotive-grade qualification (AEC-Q100) with extended temperature range (-40°C to 125°C) and wide supply voltage support (1.8V to 5.5V). Microwire interface and 5ms write cycle time are provided. Suitable for automotive and industrial applications.

M93C46-WMN6TP (STMicroelectronics): This part is verified for DiGi-Electronics programmability and offers the highest inventory availability (61,180 pcs). It provides ROHS3 compliance, Microwire interface, 5ms write cycle time, and 2.5V to 5.5V supply voltage support with -40°C to 85°C operating range.

Frequently Asked Questions (FAQ)

Q: Can I use a Microwire interface part as a substitute for the 3-Wire Serial AT93C46R-10SC?

A: Yes. Microwire and 3-Wire Serial are compatible serial interface protocols for this memory class. Both protocols support the same functional operations and pin configurations required for 1Kbit EEPROM memory access.

Q: What is the primary reason the AT93C46R-10SC is being replaced?

A: The AT93C46R-10SC is listed as obsolete. All identified substitute parts maintain active product status, ensuring long-term availability and manufacturing support.

Q: Are all substitute parts RoHS compliant?

A: All identified substitute parts are ROHS3 compliant. The original AT93C46R-10SC is RoHS non-compliant. If RoHS compliance is required for your application, any of the substitute parts will satisfy this requirement.

Q: Do the substitute parts fit the same PCB footprint?

A: Yes. All substitute parts use the 8-SOIC (0.154", 3.90mm Width) package, which is mechanically and electrically compatible with the original part's footprint.

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

A: Both CAV93C46VE-GT3 and M93C46-RMN3TP/K support the widest operating temperature range of -40°C to 125°C, compared to the original part's 0°C to 70°C range.

Q: What is the difference in write cycle time between the original and substitute parts?

A: The AT93C46R-10SC specifies 10ms write cycle time. All substitute parts reduce this to 5ms, providing faster write operations without affecting functional compatibility.

Q: Are automotive-grade parts necessary for my application?

A: Automotive-grade qualification (AEC-Q100) is required only if your application is automotive or operates in harsh industrial environments. For standard commercial applications, non-automotive-grade parts are suitable.

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