93LC46A-I/PG EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC46A-I/PG is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and 2 MHz clock frequency in an 8-PDIP through-hole package. This device is classified as obsolete product status, necessitating identification of active equivalent and substitute components for ongoing design support and production requirements. The part operates across a 2.5V to 5.5V supply voltage range with -40°C to 85°C temperature specification.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	1Kbit
Memory Organization	128 x 8
Memory Interface	Microwire
Clock Frequency	2 MHz
Write Cycle Time	6ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC46A-I/PG is determined by the following critical parameters: memory capacity (1Kbit), memory organization (128 x 8 minimum), serial interface protocol compatibility, 8-DIP package form factor, through-hole mounting, and supply voltage range overlap. Parts meeting these core electrical and mechanical specifications are classified as direct substitutes.

The substitute parts identified fall into two categories:

Category 1: Direct Microwire Interface Substitutes — Parts maintaining identical Microwire protocol and 2.5V minimum supply voltage requirement: 93LC46A-I/P and 93LC46A-E/P.

Category 2: Extended Voltage Range Substitutes — Parts with compatible memory specifications but differing interface protocol or expanded supply voltage range: 93AA46A-I/P (1.8V minimum supply) and AT93C46D-PU (3-Wire Serial interface, 1.8V minimum supply).

Parameter Comparison

Parameter	93LC46A-I/PG (Main)	93LC46A-I/P	93LC46A-E/P	93AA46A-I/P	AT93C46D-PU
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology
Memory Size	1Kbit	1Kbit	1Kbit	1Kbit	1Kbit
Memory Organization	128 x 8	128 x 8	128 x 8	128 x 8	128 x 8, 64 x 16
Memory Interface	Microwire	Microwire	Microwire	Microwire	3-Wire Serial
Clock Frequency	2 MHz	2 MHz	2 MHz	2 MHz	2 MHz
Write Cycle Time	6ms	6ms	6ms	6ms	5ms
Voltage Supply Range	2.5V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: 93LC46A-I/P — This part maintains identical electrical specifications and Microwire interface protocol as the 93LC46A-I/PG. Active product status ensures long-term availability. DiGi-Electronics programmable verification confirms functional compatibility. Packaging differs only in tube format versus the original PG packaging, with no impact on electrical performance or board-level integration.

Extended Temperature Substitute: 93LC46A-E/P — Suitable for applications requiring expanded operating temperature range to 125°C. Maintains Microwire protocol and identical voltage specifications. Active product status and verified programmability support production continuity. Temperature specification extension is the sole functional difference.

Low-Voltage Substitute: 93AA46A-I/P — Applicable in designs requiring minimum supply voltage of 1.8V. Maintains Microwire interface and 1Kbit capacity. Active product status confirmed. Programmability verification status is not confirmed; functional testing is advised prior to production deployment.

Alternative Protocol Substitute: AT93C46D-PU — Provides 1Kbit capacity with 3-Wire Serial interface instead of Microwire protocol. Requires circuit-level interface modification. Offers extended voltage range (1.8V minimum) and improved write cycle time (5ms). Highest inventory availability. Programmability verification status is not confirmed.

Frequently Asked Questions (FAQ)

Q: Can 93LC46A-I/P directly replace 93LC46A-I/PG without circuit modification?

A: Yes. Both parts share identical electrical specifications, Microwire interface protocol, memory organization, and package form factor. The only difference is packaging format (tube versus PG). No circuit modification is required.

Q: What is the key difference between 93LC46A-I/P and 93AA46A-I/P?

A: The 93AA46A-I/P supports lower minimum supply voltage (1.8V versus 2.5V). Both maintain Microwire protocol and 1Kbit capacity. Selection depends on system voltage requirements.

Q: Can AT93C46D-PU replace the 93LC46A-I/PG?

A: AT93C46D-PU uses 3-Wire Serial interface instead of Microwire protocol. Direct substitution requires circuit-level interface modification. Memory capacity and package form factor are compatible. This part is not a pin-compatible replacement.

Q: Which substitute offers the widest operating temperature range?

A: The 93LC46A-E/P operates from -40°C to 125°C, extending the upper temperature limit by 40°C compared to the original 93LC46A-I/PG specification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts maintain ROHS3 compliance status matching the original 93LC46A-I/PG specification.

Q: What is the inventory status of substitute parts?

A: 93LC46A-I/P: 4409 units. 93LC46A-E/P: 785 units. 93AA46A-I/P: 777 units. AT93C46D-PU: 250230 units. Availability varies; verify current stock with supplier.

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