93LC66BT-E/MS EEPROM Equivalent & Substitute Parts

Part Overview

The 93LC66BT-E/MS is a 4Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring Microwire interface protocol and operating across a 2.5V to 5.5V supply voltage range. This device is actively produced and widely used in embedded systems requiring persistent data storage with low power consumption. Substitute parts may be required due to inventory constraints, regional availability, or specific application requirements while maintaining functional and electrical compatibility.

Key Parameters

Parameter	Value
Memory Size	4Kbit
Memory Organization	256 x 16
Memory Interface	Microwire
Clock Frequency	2 MHz
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Package Type	8-MSOP (0.118", 3.00mm Width)
Write Cycle Time	6ms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC66BT-E/MS is determined by the following critical parameters:

Memory capacity must equal 4Kbit with 256 x 16 organization
Memory interface protocol must be Microwire compatible
Package must be 8-MSOP form factor
Supply voltage range must encompass or be compatible with 2.5V ~ 5.5V
Operating temperature range must support -40°C ~ 125°C minimum
RoHS3 compliance required

The identified substitute parts meet these core requirements while offering variations in clock frequency, write cycle time, and extended voltage specifications.

Parameter Comparison

Parameter	93LC66BT-E/MS (Main)	BR93H66RFVM-WCTR	BR93L66RFVM-WTR
Manufacturer	Microchip Technology	Rohm Semiconductor	Rohm Semiconductor
Memory Size	4Kbit	4Kbit	4Kbit
Memory Organization	256 x 16	256 x 16	256 x 16
Memory Interface	Microwire	Microwire	Microwire
Clock Frequency	2 MHz	1.25 MHz	2 MHz
Write Cycle Time	6ms	5ms	5ms
Voltage Supply Range	2.5V ~ 5.5V	2.7V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Package / Case	8-MSOP (0.118", 3.00mm)	8-MSOP (0.110", 2.80mm)	8-MSOP (0.110", 2.80mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

BR93H66RFVM-WCTR (Rohm Semiconductor): This substitute maintains Microwire interface compatibility and identical memory organization. The reduced clock frequency of 1.25 MHz is suitable for applications not requiring 2 MHz operation. The automotive-grade qualification (AEC-Q100) and extended temperature support to 125°C make this option appropriate for automotive and industrial environments. Minimum supply voltage increases to 2.7V, which may require verification in low-voltage applications.

BR93L66RFVM-WTR (Rohm Semiconductor): This substitute provides exact clock frequency matching at 2 MHz and extends the lower supply voltage limit to 1.8V, offering broader voltage compatibility. The device is verified as programmable through DiGi-Electronics. The maximum operating temperature is limited to 85°C, which restricts use in applications requiring the full -40°C ~ 125°C range of the original part.

Both substitute parts are active products with ROHS3 compliance and identical memory capacity and organization. Selection depends on specific application requirements regarding clock frequency, temperature range, and supply voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can BR93H66RFVM-WCTR replace 93LC66BT-E/MS in all applications?

A: BR93H66RFVM-WCTR is functionally compatible for Microwire interface applications. However, the reduced clock frequency (1.25 MHz vs. 2 MHz) and increased minimum supply voltage (2.7V vs. 2.5V) must be verified against specific application requirements. The automotive-grade qualification provides additional reliability for harsh environments.

Q: What is the primary difference between BR93H66RFVM-WCTR and BR93L66RFVM-WTR?

A: BR93H66RFVM-WCTR operates at 1.25 MHz with a 2.7V minimum supply voltage and supports the full -40°C ~ 125°C temperature range. BR93L66RFVM-WTR operates at 2 MHz with a 1.8V minimum supply voltage but is limited to -40°C ~ 85°C maximum temperature. Clock frequency and temperature range are the critical differentiators.

Q: Are there package compatibility concerns between the main part and substitutes?

A: All parts use 8-MSOP packaging. The main part specifies 0.118" width (3.00mm), while both substitutes specify 0.110" width (2.80mm). This minor dimensional difference must be evaluated for PCB layout and mechanical assembly compatibility in space-constrained applications.

Q: Do all parts meet the same compliance standards?

A: All three parts are ROHS3 compliant and REACH unaffected. BR93H66RFVM-WCTR carries additional AEC-Q100 automotive qualification. All parts are classified as EAR99 for export control purposes.

Q: Which substitute is recommended for low-voltage applications below 2.5V?

A: BR93L66RFVM-WTR supports operation down to 1.8V supply voltage. However, the maximum operating temperature is limited to 85°C, which may not be suitable for all industrial or automotive applications requiring extended temperature ranges.

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