93C46BT-I/MC EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C46BT-I/MC is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and operating at 2 MHz clock frequency. This component is classified as Active product status with full RoHS3 compliance and REACH unaffected designation. The device is packaged in 8-DFN (2x3) surface mount configuration with exposed pad, suitable for applications requiring non-volatile memory storage in compact form factors. Substitute parts are identified when equivalent memory capacity, interface protocol, operating temperature range, and package compatibility align with the original specification requirements.

Key Parameters

Parameter	Specification
Memory Size	1Kbit
Memory Organization	64 x 16
Memory Interface	Microwire
Clock Frequency	2 MHz
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Write Cycle Time	2ms
Package Type	8-VFDFN Exposed Pad
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 93C46BT-I/MC are qualified based on the following critical parameters: memory capacity (1Kbit), memory interface protocol compatibility, clock frequency (2 MHz), operating temperature range (-40°C ~ 85°C), surface mount packaging in 8-pin DFN configuration, and regulatory compliance (RoHS3, REACH unaffected).

The 93LC46BT-I/MC qualifies as a direct substitute despite extended voltage supply range (2.5V ~ 5.5V) and increased write cycle time (6ms), as these represent relaxed specifications that maintain functional compatibility within the original operating envelope. The AT93C46DY6-YH-T qualifies as a functional substitute with modified memory organization (128 x 8, 64 x 16) and extended voltage range (1.8V ~ 5.5V), though package designation differs (8-UFDFN vs. 8-VFDFN) and interface protocol is specified as 3-Wire Serial rather than Microwire.

Parameter Comparison

Parameter	93C46BT-I/MC	93LC46BT-I/MC	AT93C46DY6-YH-T
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology
Memory Size	1Kbit	1Kbit	1Kbit
Memory Organization	64 x 16	64 x 16	128 x 8, 64 x 16
Memory Interface	Microwire	Microwire	3-Wire Serial
Clock Frequency	2 MHz	2 MHz	2 MHz
Voltage Supply Range	4.5V ~ 5.5V	2.5V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Write Cycle Time	2ms	6ms	5ms
Package Type	8-VFDFN Exposed Pad	8-VFDFN Exposed Pad	8-UFDFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

All three parts maintain Active product status with ROHS3 compliance and REACH unaffected regulatory standing. The 93LC46BT-I/MC provides direct substitution with identical package footprint (8-VFDFN) and Microwire interface protocol, with the trade-off of extended write cycle time (6ms vs. 2ms) and broader voltage tolerance (2.5V minimum vs. 4.5V minimum). The AT93C46DY6-YH-T offers the widest voltage operating range (1.8V ~ 5.5V) and fastest write cycle time (5ms), but requires interface protocol verification (3-Wire Serial vs. Microwire) and package footprint confirmation (8-UFDFN vs. 8-VFDFN) prior to implementation.

Frequently Asked Questions (FAQ)

Q: Can the 93LC46BT-I/MC replace the 93C46BT-I/MC in all applications?

A: The 93LC46BT-I/MC maintains identical memory capacity, organization, interface protocol, and package footprint. The extended write cycle time (6ms vs. 2ms) and lower minimum voltage requirement (2.5V vs. 4.5V) represent specification relaxations. Substitution is valid for applications where write cycle timing is not critical and supply voltage remains within the 4.5V ~ 5.5V range of the original part.

Q: What is the primary difference between the AT93C46DY6-YH-T and the 93C46BT-I/MC?

A: The AT93C46DY6-YH-T differs in three key areas: interface protocol (3-Wire Serial vs. Microwire), package designation (8-UFDFN vs. 8-VFDFN), and memory organization flexibility (128 x 8 or 64 x 16 vs. fixed 64 x 16). These differences require verification of firmware compatibility and PCB layout accommodation before substitution.

Q: Are all substitute parts available in the same packaging format?

A: The 93LC46BT-I/MC uses identical 8-VFDFN Exposed Pad packaging. The AT93C46DY6-YH-T uses 8-UFDFN Exposed Pad packaging, which differs in physical dimensions and pin configuration. PCB layout verification is required if substituting the AT93C46DY6-YH-T.

Q: Do all parts meet the same regulatory requirements?

A: All three parts are ROHS3 compliant and REACH unaffected. Moisture sensitivity levels differ: 93C46BT-I/MC (MSL 1), 93LC46BT-I/MC (MSL 3), and AT93C46DY6-YH-T (MSL 3). Storage and handling procedures must align with the applicable moisture sensitivity classification.

Q: What is the impact of different write cycle times on system performance?

A: The 93C46BT-I/MC specifies 2ms write cycle time, while 93LC46BT-I/MC specifies 6ms and AT93C46DY6-YH-T specifies 5ms. Applications requiring rapid sequential write operations must account for these timing differences in firmware implementation.

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