93LC46BXT-I/SNG Equivalent & Substitute Parts

Part Overview

The 93LC46BXT-I/SNG is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and operating at 2 MHz clock frequency. This non-volatile memory device is packaged in 8-SOIC surface mount configuration with supply voltage range of 2.5V to 5.5V and operating temperature range of -40°C to 85°C. The part is currently active in production status and ROHS3 compliant. Equivalent and substitute parts are identified based on matching memory capacity, interface protocol compatibility, package form factor, and electrical operating parameters to ensure functional interchangeability in circuit applications.

Key Parameters

Parameter	Specification
Memory Type	Non-Volatile EEPROM
Memory Size	1Kbit
Memory Organization	64 x 16
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-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the 93LC46BXT-I/SNG are grouped based on the following critical parameters that determine functional interchangeability:

Primary Substitution Criteria:

Memory capacity: 1Kbit
Memory organization: 64 x 16 bit structure
Interface protocol: Microwire serial communication
Clock frequency: 2 MHz operation
Package form factor: 8-SOIC surface mount
Supply voltage compatibility: Minimum 2.5V operation
Operating temperature range: -40°C to 85°C
RoHS3 compliance status

Substitution Groups:

Group 1 - Microchip Technology Microwire EEPROM (Direct Equivalents): Parts 93AA46BT-I/SN, 93LC46BT-I/SN, and 93LC46BXT-I/SN maintain identical memory specifications and Microwire interface protocol. These parts differ in packaging format (Tape & Reel vs. Cut Tape) and supply voltage range, with 93AA46BT-I/SN supporting extended lower voltage operation (1.8V minimum).

Group 2 - Rohm Semiconductor Microwire EEPROM: Parts BR93L46F-WE2, BR93L46FJ-WE2, and BR93L46RFJ-WE2 provide equivalent 1Kbit Microwire EEPROM functionality with identical memory organization and clock frequency. These parts feature 8-SOP package variants with slightly different body widths (0.173" vs. 0.154") and support lower supply voltage operation (1.8V minimum).

Group 3 - STMicroelectronics EEPROM: Part M93C46-WMN6TP provides Microwire interface with flexible memory organization (128 x 8 or 64 x 16 configuration) and identical electrical specifications. Part M93S46-WMN6TP offers SPI interface alternative with equivalent memory capacity and electrical parameters.

Group 4 - Microchip Technology 3-Wire Serial EEPROM: Part AT93C46EN-SH-T provides 1Kbit EEPROM with 3-Wire Serial interface (alternative to Microwire protocol) in 8-SOIC package, supporting extended lower voltage operation (1.8V minimum) with faster write cycle time (5ms vs. 6ms).

Parameter Comparison

Part Number	Manufacturer	Memory Size	Interface	Clock Freq	Write Cycle	Voltage Range	Package	MSL
93LC46BXT-I/SNG	Microchip	1Kbit	Microwire	2 MHz	6ms	2.5V ~ 5.5V	8-SOIC	1
93AA46BT-I/SN	Microchip	1Kbit	Microwire	2 MHz	6ms	1.8V ~ 5.5V	8-SOIC	1
93LC46BT-I/SN	Microchip	1Kbit	Microwire	2 MHz	6ms	2.5V ~ 5.5V	8-SOIC	1
93LC46BXT-I/SN	Microchip	1Kbit	Microwire	2 MHz	6ms	2.5V ~ 5.5V	8-SOIC	3
AT93C46EN-SH-T	Microchip	1Kbit	3-Wire Serial	2 MHz	5ms	1.8V ~ 5.5V	8-SOIC	1
BR93L46F-WE2	Rohm	1Kbit	Microwire	2 MHz	5ms	1.8V ~ 5.5V	8-SOP	1
BR93L46FJ-WE2	Rohm	1Kbit	Microwire	2 MHz	5ms	1.8V ~ 5.5V	8-SOP-J	1
BR93L46RFJ-WE2	Rohm	1Kbit	Microwire	2 MHz	5ms	1.8V ~ 5.5V	8-SOP-J	1
M93C46-WMN6TP	STMicroelectronics	1Kbit	Microwire	2 MHz	5ms	2.5V ~ 5.5V	8-SOIC	1
M93S46-WMN6TP	STMicroelectronics	1Kbit	SPI	2 MHz	5ms	2.5V ~ 5.5V	8-SOIC	1

Engineering Selection Recommendations

Direct Substitution (Microwire Interface Maintained):

For applications requiring strict Microwire protocol compatibility, select from 93AA46BT-I/SN, 93LC46BT-I/SN, 93LC46BXT-I/SN, BR93L46F-WE2, BR93L46FJ-WE2, BR93L46RFJ-WE2, or M93C46-WMN6TP. All maintain identical 1Kbit capacity, 64 x 16 organization, 2 MHz clock frequency, and 8-SOIC package footprint. Selection among these parts depends on supply voltage requirements (1.8V minimum for 93AA46BT-I/SN, BR93L46 series, and AT93C46EN-SH-T vs. 2.5V minimum for 93LC46 and M93C46 series), packaging format preference (Tape & Reel vs. Cut Tape), and write cycle time tolerance (5ms vs. 6ms).

Alternative Interface Protocols:

Part AT93C46EN-SH-T provides 3-Wire Serial interface as alternative to Microwire, requiring circuit redesign for signal protocol compatibility. Part M93S46-WMN6TP offers SPI interface alternative, also requiring protocol adaptation in host circuitry.

Compliance and Availability:

All substitute parts maintain ROHS3 compliance and active production status. Moisture sensitivity level (MSL) is 1 (unlimited) for all parts except 93LC46BXT-I/SN (MSL 3, 168 hours), which requires controlled storage conditions. Inventory availability varies across manufacturers and packaging formats, with M93C46-WMN6TP and 93LC46BT-I/SN showing highest stock levels (61,180 and 66,400 units respectively).

Frequently Asked Questions (FAQ)

Q: Can 93AA46BT-I/SN replace 93LC46BXT-I/SNG in all applications?

A: Yes, for applications operating at 2.5V or higher. The 93AA46BT-I/SN supports extended lower voltage operation (1.8V minimum) and maintains identical Microwire interface, memory capacity, clock frequency, and 8-SOIC package. Both parts are ROHS3 compliant with MSL 1 rating.

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

A: Microwire and 3-Wire Serial are distinct serial communication protocols requiring different signal timing and pin configurations. AT93C46EN-SH-T uses 3-Wire Serial protocol, while 93LC46BXT-I/SNG uses Microwire. Direct substitution requires circuit redesign to accommodate protocol differences.

Q: Are Rohm BR93L46 parts compatible with the 93LC46BXT-I/SNG package footprint?

A: BR93L46F-WE2 uses 8-SOP package (0.173" width) versus 93LC46BXT-I/SNG 8-SOIC package (0.154" width). BR93L46FJ-WE2 and BR93L46RFJ-WE2 use 8-SOP-J package (0.154" width) matching the original part's body width. PCB layout verification is required for package variant substitution.

Q: What is the significance of MSL rating differences?

A: Moisture Sensitivity Level (MSL) 1 indicates unlimited shelf life under standard conditions. 93LC46BXT-I/SN with MSL 3 requires controlled storage at 30°C/60% RH maximum for 168 hours after packaging. For applications with extended storage requirements, select parts with MSL 1 rating.

Q: Can M93S46-WMN6TP (SPI interface) replace 93LC46BXT-I/SNG (Microwire interface)?

A: No direct substitution without circuit modification. SPI and Microwire protocols differ in signal timing, clock requirements, and data format. M93S46-WMN6TP requires host controller redesign to implement SPI communication protocol.

Q: Which substitute part offers the fastest write cycle time?

A: AT93C46EN-SH-T, BR93L46F-WE2, BR93L46FJ-WE2, BR93L46RFJ-WE2, M93C46-WMN6TP, and M93S46-WMN6TP all feature 5ms write cycle time versus 6ms for 93LC46BXT-I/SNG. This 1ms improvement may be significant for time-critical write operations.

Q: Are all substitute parts available in Tape & Reel packaging?

A: BR93L46F-WE2, BR93L46FJ-WE2, BR93L46RFJ-WE2, 93AA46BT-I/SN, and 93LC46BXT-I/SN are available in Tape & Reel format. M93C46-WMN6TP and M93S46-WMN6TP are supplied in Cut Tape & Digi-Reel format. AT93C46EN-SH-T and 93LC46BT-I/SN are available in Cut Tape & Digi-Reel format.

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