CAT93C46RYI-G EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The CAT93C46RYI-G is a 1Kbit EEPROM memory IC manufactured by onsemi, featuring Microwire serial interface protocol and 4 MHz clock frequency in an 8-TSSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and system maintenance. Substitute parts must maintain functional compatibility across memory capacity, interface protocol, package form factor, and electrical operating parameters.

Key Parameters

Parameter	Value
Memory Size	1Kbit
Memory Organization	128 x 8, 64 x 16
Memory Interface	Microwire
Clock Frequency	4 MHz
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Memory Type	Non-Volatile EEPROM

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following core parameters:

Memory Capacity: 1Kbit (128 x 8 or 64 x 16 organization)
Interface Protocol: Microwire or 3-Wire Serial (functionally compatible serial protocols)
Package Form Factor: 8-TSSOP surface mount package
Supply Voltage Range: Minimum 1.8V ~ 5.5V compatibility
Operating Temperature Range: Minimum -40°C ~ 85°C coverage
Mounting Type: Surface mount only

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

Category A - Microwire Interface: CAT93C46YI-G, 93AA46C-I/ST, 93AA46CT-I/ST, M93C46-RDW3TP/K, M93C46-WDW6TP

Category B - 3-Wire Serial Interface: AT93C46D-TH-B (functionally compatible alternative with different serial protocol)

Clock frequency variations (2 MHz, 3 MHz, 4 MHz) do not disqualify substitution, as lower frequencies remain compatible with systems designed for higher clock rates.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Interface	Clock Frequency	Voltage Supply	Operating Temp	Package	Product Status	Packaging Type
CAT93C46RYI-G	onsemi	1Kbit	Microwire	4 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Obsolete	Tube
CAT93C46YI-G	onsemi	1Kbit	Microwire	2 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	Tube
93AA46C-I/ST	Microchip Technology	1Kbit	Microwire	3 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	Tube
93AA46CT-I/ST	Microchip Technology	1Kbit	Microwire	3 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	Tape & Reel
AT93C46D-TH-B	Microchip Technology	1Kbit	3-Wire Serial	2 MHz	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	Tube
M93C46-RDW3TP/K	STMicroelectronics	1Kbit	Microwire	2 MHz	1.8V ~ 5.5V	-40°C ~ 125°C	8-TSSOP	Active	Tape & Reel
M93C46-WDW6TP	STMicroelectronics	1Kbit	Microwire	2 MHz	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active	Cut Tape & Digi-Reel

Engineering Selection Recommendations

Primary Substitutes (Microwire Interface - Direct Protocol Compatibility)

CAT93C46YI-G, 93AA46C-I/ST, and 93AA46CT-I/ST are direct functional equivalents with active product status and full RoHS3 compliance. These parts maintain identical memory organization, package geometry, and voltage supply specifications. Selection between these options depends on packaging requirements (Tube vs. Tape & Reel) and inventory availability.

M93C46-RDW3TP/K and M93C46-WDW6TP are STMicroelectronics alternatives with automotive-grade qualification (AEC-Q100) and extended temperature range (-40°C ~ 125°C for M93C46-RDW3TP/K). These are suitable for applications requiring enhanced reliability or automotive compliance. Note that M93C46-WDW6TP has a reduced minimum supply voltage of 2.5V, which may limit compatibility with systems requiring 1.8V operation.

Secondary Substitute (3-Wire Serial Interface - Protocol Variation)

AT93C46D-TH-B operates with 3-Wire Serial protocol instead of Microwire. This part is functionally compatible for 1Kbit EEPROM applications but requires interface-level firmware or hardware adaptation. Selection of this part is appropriate only when system architecture supports dual-protocol operation or when protocol conversion is implemented.

Recommendation Priority

CAT93C46YI-G (onsemi, active status, direct Microwire equivalent)
93AA46C-I/ST or 93AA46CT-I/ST (Microchip, active status, high inventory availability)
M93C46-WDW6TP (STMicroelectronics, high inventory, verified programmable status)
M93C46-RDW3TP/K (STMicroelectronics, automotive-qualified, extended temperature range)
AT93C46D-TH-B (protocol variation, requires interface adaptation)

Frequently Asked Questions (FAQ)

Q: Can CAT93C46YI-G directly replace CAT93C46RYI-G?

A: Yes. Both parts share identical memory capacity (1Kbit), Microwire interface protocol, 8-TSSOP package geometry, and voltage supply range (1.8V ~ 5.5V). The primary difference is clock frequency (2 MHz vs. 4 MHz). CAT93C46YI-G operates at lower frequency but remains fully compatible with systems designed for the 4 MHz variant, as timing requirements are typically less stringent than maximum clock capability.

Q: What is the difference between Microwire and 3-Wire Serial interfaces?

A: Both are serial communication protocols for EEPROM devices. Microwire is a three-wire protocol (Chip Select, Clock, Data In/Out). 3-Wire Serial is a similar but distinct protocol. AT93C46D-TH-B uses 3-Wire Serial and requires interface-level compatibility verification before substitution. Direct pin-for-pin replacement is not guaranteed without protocol adaptation.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification. The original CAT93C46RYI-G does not specify RoHS status in the provided data.

Q: Does package type (Tube vs. Tape & Reel) affect electrical compatibility?

A: No. Packaging type (Tube, Tape & Reel, Cut Tape) affects only handling, storage, and assembly processes. Electrical and functional specifications remain identical regardless of packaging format. Selection should be based on manufacturing equipment compatibility and supply chain requirements.

Q: Can M93C46-RDW3TP/K be used in non-automotive applications?

A: Yes. Automotive-qualified parts (AEC-Q100) exceed standard reliability requirements and are fully compatible with non-automotive applications. The extended operating temperature range (-40°C ~ 125°C) provides additional margin for demanding environments.

Q: What is the impact of different clock frequencies (2 MHz, 3 MHz, 4 MHz)?

A: Clock frequency determines maximum data transfer rate. A substitute part with lower clock frequency (2 MHz or 3 MHz) is compatible with systems designed for higher frequencies (4 MHz), as the system will operate within the substitute's timing specifications. Substitution with a higher clock frequency part is also compatible. Clock frequency does not affect memory capacity or data retention.

Q: Is M93C46-WDW6TP compatible with 1.8V supply systems?

A: No. M93C46-WDW6TP has a minimum supply voltage of 2.5V, making it incompatible with systems requiring 1.8V operation. All other substitute parts support the full 1.8V ~ 5.5V range. Verify system supply voltage requirements before selecting this part.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes, provided the design uses standard 8-TSSOP footprints and does not rely on manufacturer-specific timing margins. All substitute parts share identical package geometry (0.173" width, 4.40mm). Verify interface protocol compatibility (Microwire vs. 3-Wire Serial) and supply voltage requirements before implementation.

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