93LC46B/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC46B/ST is a 1Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, featuring Microwire serial interface protocol and operating at 2 MHz clock frequency. This device is classified as Active product status and is widely used in embedded systems requiring non-volatile memory storage with low pin count and minimal board space requirements.

Substitute parts become necessary when the primary part experiences supply constraints, inventory limitations, or when design requirements necessitate extended operating temperature ranges or alternative interface protocols while maintaining core memory functionality.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	1Kbit
Memory Organization	64 x 16
Memory Interface	Microwire
Clock Frequency	2 MHz
Write Cycle Time	6ms
Supply Voltage Range	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC46B/ST is determined by the following critical parameters:

Primary Substitution Criteria:

Memory capacity (1Kbit) and organization (64 x 16 bits)
Package form factor (8-TSSOP or mechanically equivalent)
Serial interface protocol compatibility (Microwire or 3-Wire Serial)
Clock frequency (2 MHz operation)
Supply voltage envelope compatibility

Secondary Considerations:

Operating temperature range extensions
Write cycle time variations
Product lifecycle status
Packaging format (Tube vs. Tape & Reel)

The substitute parts listed maintain functional equivalence through identical memory capacity, compatible interface protocols, and matching package dimensions, while offering variations in temperature rating and supply voltage specifications.

Parameter Comparison

Parameter	93LC46B/ST	93LC46B-I/ST	AT93C46E-TH-B	BR93L46RFV-WE2
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Rohm Semiconductor
Memory Size	1Kbit	1Kbit	1Kbit	1Kbit
Memory Organization	64 x 16	64 x 16	64 x 16	64 x 16
Memory Interface	Microwire	Microwire	3-Wire Serial	Microwire
Clock Frequency	2 MHz	2 MHz	2 MHz	2 MHz
Write Cycle Time	6ms	6ms	5ms	5ms
Supply Voltage	2.5V ~ 5.5V	2.5V ~ 5.5V	1.8V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-TSSOP	8-TSSOP	8-TSSOP	8-LSSOP
Product Status	Active	Active	Active	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

93LC46B-I/ST is the primary direct substitute for 93LC46B/ST. Both devices are manufactured by Microchip Technology with identical memory specifications, Microwire interface, and 8-TSSOP packaging. The 93LC46B-I/ST offers extended operating temperature range (-40°C ~ 85°C) compared to the original part (0°C ~ 70°C), making it suitable for industrial and automotive applications requiring wider temperature operation. Both parts maintain Active product status and ROHS3 compliance.

AT93C46E-TH-B provides functional substitution with the following distinctions: interface protocol is 3-Wire Serial rather than Microwire, supply voltage range extends to 1.8V minimum (versus 2.5V), and write cycle time is reduced to 5ms. This part is suitable when circuit design accommodates 3-Wire Serial protocol and lower voltage operation is beneficial. Active product status and ROHS3 compliance are maintained.

BR93L46RFV-WE2 is a Rohm Semiconductor alternative maintaining Microwire interface and 2 MHz operation. This part carries "Not For New Designs" product status, indicating manufacturer discontinuation trajectory. Supply voltage extends to 1.8V and write cycle time is 5ms. Package is 8-LSSOP rather than 8-TSSOP. Selection of this part is not recommended for new designs due to lifecycle status.

Frequently Asked Questions (FAQ)

Q: Can 93LC46B-I/ST directly replace 93LC46B/ST in existing designs?

A: Yes. Both parts share identical memory capacity (1Kbit), organization (64 x 16), Microwire interface protocol, 2 MHz clock frequency, and 8-TSSOP package dimensions. The 93LC46B-I/ST extends operating temperature range to -40°C ~ 85°C, which is backward compatible with designs specified for 0°C ~ 70°C operation.

Q: What is the primary difference between AT93C46E-TH-B and 93LC46B/ST?

A: The AT93C46E-TH-B uses 3-Wire Serial interface protocol instead of Microwire. This requires circuit-level interface modifications. The AT93C46E-TH-B also supports lower minimum supply voltage (1.8V vs. 2.5V) and offers faster write cycle time (5ms vs. 6ms). Substitution requires verification of interface protocol compatibility in the target application.

Q: Why is BR93L46RFV-WE2 marked "Not For New Designs"?

A: This designation indicates the manufacturer (Rohm Semiconductor) has discontinued active development and is transitioning this part to end-of-life status. While currently available in inventory, new designs should not incorporate this part. Use 93LC46B-I/ST or AT93C46E-TH-B for new applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (93LC46B-I/ST, AT93C46E-TH-B, BR93L46RFV-WE2) maintain ROHS3 compliance and are REACH unaffected, matching the environmental compliance profile of the original 93LC46B/ST.

Q: What packaging formats are available?

A: 93LC46B/ST and 93LC46B-I/ST are supplied in Tube packaging. AT93C46E-TH-B is supplied in Tube packaging. BR93L46RFV-WE2 is supplied in Tape & Reel format. Verify packaging requirements for automated assembly processes before selection.

Q: Can I use a substitute part with extended temperature range in a design specified for 0°C ~ 70°C?

A: Yes. Extended temperature range parts (93LC46B-I/ST, AT93C46E-TH-B, BR93L46RFV-WE2) are backward compatible with designs specified for narrower temperature ranges. The extended range provides additional operational margin without design modification.

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