AT93C46A-10SC EEPROM Equivalent & Substitute Parts

Part Overview

The AT93C46A-10SC is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring 3-Wire Serial interface with 2 MHz clock frequency and 8-SOIC surface mount packaging. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The part operates within a 4.5V to 5.5V supply voltage range and supports 128 x 8 or 64 x 16 memory organization with a 10ms write cycle time.

Key Parameters

Parameter	Value
Memory Size	1Kbit
Memory Format	EEPROM
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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the AT93C46A-10SC is determined by the following critical parameters:

Primary Compatibility Criteria:

Memory Size: 1Kbit (non-negotiable)
Memory Format: EEPROM (non-negotiable)
Package / Case: 8-SOIC (non-negotiable)
Mounting Type: Surface Mount (non-negotiable)
Clock Frequency: 2 MHz (non-negotiable)
Voltage Supply Range: Must encompass or match 4.5V ~ 5.5V

Interface Consideration: The AT93C46A-10SC uses 3-Wire Serial interface. Substitute parts identified use Microwire interface, which is functionally compatible for this memory category and maintains the same pin configuration within the 8-SOIC package.

Secondary Factors:

Write Cycle Time variations are acceptable within engineering tolerances
Operating temperature range may extend beyond the original specification
RoHS compliance status and product status (Active vs. Obsolete) are documented for procurement planning

All identified substitutes maintain identical physical packaging, electrical interface compatibility, and memory capacity specifications.

Parameter Comparison

Parameter	AT93C46A-10SC	93C46B/SN	93C46BT/SN	93C46BX/SN	93C46BXT/SN	93LC46BXT-I/SNG
Memory Size	1Kbit	1Kbit	1Kbit	1Kbit	1Kbit	1Kbit
Memory Format	EEPROM	EEPROM	EEPROM	EEPROM	EEPROM	EEPROM
Memory Interface	3-Wire Serial	Microwire	Microwire	Microwire	Microwire	Microwire
Clock Frequency	2 MHz	2 MHz	2 MHz	2 MHz	2 MHz	2 MHz
Write Cycle Time	10ms	2ms	2ms	2ms	2ms	6ms
Voltage Supply Range	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Standard Operating Conditions (4.5V ~ 5.5V, 0°C ~ 70°C):

The 93C46B series (93C46B/SN, 93C46BT/SN, 93C46BX/SN, 93C46BXT/SN) provides direct functional replacement with active product status and ROHS3 compliance. These parts are suitable for applications requiring standard industrial temperature ranges and standard voltage supplies. Selection among these variants depends on packaging requirements: Tube (93C46B/SN, 93C46BX/SN), Cut Tape & Digi-Reel (93C46BT/SN), or Tape & Reel (93C46BXT/SN).

For Extended Operating Conditions or Low-Voltage Applications:

The 93LC46BXT-I/SNG extends the supply voltage range to 2.5V ~ 5.5V and operating temperature to -40°C ~ 85°C, making it suitable for applications requiring wider environmental tolerance. This part is supplied in Tape & Reel packaging and maintains ROHS3 compliance.

Compliance Considerations:

All substitute parts are ROHS3 compliant, addressing regulatory requirements that the obsolete AT93C46A-10SC does not meet. All parts maintain REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can the 93C46B series directly replace the AT93C46A-10SC?

A: Yes. The 93C46B series maintains identical memory capacity (1Kbit), package (8-SOIC), clock frequency (2 MHz), and voltage supply range (4.5V ~ 5.5V). The interface change from 3-Wire Serial to Microwire is functionally compatible within this memory category and maintains the same pin configuration.

Q: What is the difference between the 93C46B variants?

A: The 93C46B/SN, 93C46BT/SN, 93C46BX/SN, and 93C46BXT/SN are electrically identical. Differences exist only in packaging format: Tube, Cut Tape & Digi-Reel, Tube, and Tape & Reel respectively. Selection depends on assembly and procurement requirements.

Q: When should I use 93LC46BXT-I/SNG instead of the 93C46B series?

A: Use 93LC46BXT-I/SNG when your application requires operation below 4.5V or above 70°C. This part supports 2.5V minimum supply voltage and -40°C to 85°C operating temperature range. Write cycle time increases to 6ms compared to 2ms for the 93C46B series.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts are ROHS3 compliant, whereas the original AT93C46A-10SC is RoHS non-compliant. This is a significant advantage for new designs and procurement in regulated markets.

Q: Does the faster write cycle time of substitute parts affect compatibility?

A: No. The 93C46B series write cycle time of 2ms is faster than the original 10ms specification. Faster write cycles are backward compatible and do not create timing conflicts in applications designed for the original part.

Q: What packaging options are available for production?

A: Tube packaging (93C46B/SN, 93C46BX/SN) is suitable for manual assembly. Cut Tape & Digi-Reel (93C46BT/SN) and Tape & Reel (93C46BXT/SN, 93LC46BXT-I/SNG) are optimized for automated pick-and-place assembly.

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