AT93C46-10PI-2.7 Equivalent & Substitute Parts

Part Overview

The AT93C46-10PI-2.7 is a 1Kbit EEPROM memory IC with 3-Wire Serial interface operating at 2 MHz, manufactured by Microchip Technology in 8-DIP packaging. This part is currently obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The device supports non-volatile memory storage with supply voltage range of 2.7V to 5.5V and operates across industrial temperature range -40°C to 85°C.

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	2.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the AT93C46-10PI-2.7 is determined by the following critical parameters: memory size (1Kbit), memory format (EEPROM), package type (8-DIP), mounting type (Through Hole), and physical dimensions (0.300", 7.62mm). The memory interface type, clock frequency, voltage supply range, and write cycle time are secondary parameters that define functional compatibility.

Two categories of substitutes are identified:

Category 1: Direct Interface Compatible (Microwire Protocol) Parts using Microwire interface protocol with equivalent memory capacity and package specifications.

Category 2: Voltage Supply Consideration Parts with extended or modified voltage supply ranges affecting application suitability.

Parameter Comparison

Parameter	AT93C46-10PI-2.7	93AA46C-I/P	93C46B-I/P	93C46B/P
Memory Size	1Kbit	1Kbit	1Kbit	1Kbit
Memory Format	EEPROM	EEPROM	EEPROM	EEPROM
Memory Organization	128 x 8, 64 x 16	128 x 8, 64 x 16	64 x 16	64 x 16
Memory Interface	3-Wire Serial	Microwire	Microwire	Microwire
Clock Frequency	2 MHz	3 MHz	2 MHz	2 MHz
Write Cycle Time	10ms	6ms	2ms	2ms
Voltage Supply Range	2.7V ~ 5.5V	1.8V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C
Package Type	8-DIP	8-DIP	8-DIP	8-DIP
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

93C46B-I/P is the manufacturer-recommended substitute. This part maintains identical clock frequency (2 MHz) and write cycle time (2ms) specifications, operates across the full industrial temperature range (-40°C to 85°C), and carries ROHS3 compliance certification. Verification status is confirmed by DiGi-Electronics. Inventory availability is 5200 units.

93C46B/P provides an alternative with identical electrical specifications to 93C46B-I/P but operates within commercial temperature range (0°C to 70°C). This part is suitable for applications not requiring extended low-temperature operation. ROHS3 compliance is confirmed. Inventory availability is 3812 units.

93AA46C-I/P offers extended voltage supply range (1.8V to 5.5V) and improved write cycle time (6ms), with higher clock frequency (3 MHz). This part is suitable for low-voltage applications. ROHS3 compliance is confirmed. Inventory availability is 763 units.

All substitute parts maintain 8-DIP package compatibility, Through Hole mounting type, and equivalent memory capacity (1Kbit EEPROM).

Frequently Asked Questions (FAQ)

Q: Can 93AA46C-I/P directly replace AT93C46-10PI-2.7? A: Yes, from a package and memory capacity perspective. However, the memory interface differs (Microwire vs. 3-Wire Serial). Circuit-level compatibility depends on the application's interface implementation. The 93AA46C-I/P operates at 3 MHz versus the original 2 MHz and supports lower supply voltage (1.8V minimum).

Q: What is the difference between 93C46B-I/P and 93C46B/P? A: Both parts are electrically identical with 2 MHz clock frequency and 2ms write cycle time. The primary difference is operating temperature range: 93C46B-I/P supports -40°C to 85°C (industrial), while 93C46B/P supports 0°C to 70°C (commercial). Select based on application temperature requirements.

Q: Why does the original part show 10ms write cycle time while substitutes show 2ms or 6ms? A: Write cycle time is a specified parameter provided in the input data. The substitute parts have faster write cycle times, which represents improved performance characteristics. Applications designed for the original 10ms specification will function correctly with faster write cycle times.

Q: Are all substitute parts RoHS compliant? A: Yes. All three substitute parts (93AA46C-I/P, 93C46B-I/P, and 93C46B/P) carry ROHS3 compliance certification, while the original AT93C46-10PI-2.7 is RoHS non-compliant.

Q: What voltage supply range should I select? A: The original part supports 2.7V to 5.5V. The 93AA46C-I/P extends this to 1.8V to 5.5V for low-voltage applications. The 93C46B variants operate within 4.5V to 5.5V range. Select based on your circuit's supply voltage specifications.

Q: Is the 8-DIP package pinout identical across all parts? A: All parts use 8-DIP (0.300", 7.62mm) packaging with Through Hole mounting. Physical package dimensions are identical, enabling direct PCB footprint compatibility.

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