93C46BT-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C46BT-E/ST is a 1Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and operating at 2 MHz clock frequency. This component is designed for applications requiring small-capacity persistent data storage with low power consumption and high reliability. The part is currently in active production status. Substitute parts may be required due to inventory constraints, end-of-life considerations for legacy designs, or specific application requirements related to voltage supply range, operating temperature specifications, or write cycle performance characteristics.

Key Parameters

Parameter	Specification
Memory Type	Non-Volatile EEPROM
Memory Size	1Kbit
Memory Organization	64 x 16
Memory Interface	Microwire
Clock Frequency	2 MHz
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature Range	-40°C ~ 125°C
Write Cycle Time	2ms
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93C46BT-E/ST is determined by the following critical parameters:

Core Compatibility Requirements:

Memory capacity: 1Kbit (64 x 16 organization)
Serial interface protocol: Microwire
Clock frequency: 2 MHz
Package footprint: 8-pin TSSOP/SSOP form factor (0.173", 4.40mm width)
Surface mount technology

Flexible Parameters (allowing substitution with design considerations):

Voltage supply range: Minimum 4.5V required; extended lower voltage capability acceptable
Operating temperature range: Minimum -40°C to 125°C; narrower ranges acceptable if application requirements permit
Write cycle time: 2ms baseline; longer cycle times acceptable if system timing permits
Product status: Active preferred; Not For New Designs acceptable for existing designs

The BR93L46RFV-WE2 manufactured by Rohm Semiconductor qualifies as a direct substitute based on matching core compatibility requirements while offering extended voltage supply range (1.8V ~ 5.5V) and verified programmability status.

Parameter Comparison

Parameter	93C46BT-E/ST (Microchip)	BR93L46RFV-WE2 (Rohm)
Memory Type	Non-Volatile EEPROM	Non-Volatile EEPROM
Memory Size	1Kbit	1Kbit
Memory Organization	64 x 16	64 x 16
Memory Interface	Microwire	Microwire
Clock Frequency	2 MHz	2 MHz
Voltage Supply Range	4.5V ~ 5.5V	1.8V ~ 5.5V
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 85°C
Write Cycle Time	2ms	5ms
Package Type	8-TSSOP	8-LSSOP (8-SSOP-B)
Mounting Type	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Not For New Designs

Engineering Selection Recommendations

Primary Selection (93C46BT-E/ST): Select the Microchip 93C46BT-E/ST for new designs. This part maintains active production status, supports the full operating temperature range of -40°C to 125°C, and delivers the fastest write cycle time of 2ms. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) ensure compatibility with standard manufacturing and storage processes.

Substitute Selection (BR93L46RFV-WE2): The Rohm BR93L46RFV-WE2 is suitable for existing designs or applications where the following conditions are met: operating temperature requirements do not exceed 85°C, write cycle time of 5ms is acceptable for system timing, and voltage supply range can be maintained within 1.8V to 5.5V. This part carries verified programmability status and ROHS3 compliance. The narrower temperature range and extended write cycle time represent the primary design trade-offs against the benefit of extended low-voltage operation capability.

Both parts are ROHS3 compliant and REACH unaffected, meeting standard environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can BR93L46RFV-WE2 replace 93C46BT-E/ST in all applications?

A: Substitution is valid only when application requirements permit a maximum operating temperature of 85°C and write cycle time of 5ms. If your design requires operation above 85°C or depends on 2ms write cycle timing, the 93C46BT-E/ST is required.

Q: What is the difference between 8-TSSOP and 8-LSSOP packaging?

A: Both packages maintain the same 0.173" width (4.40mm) and 8-pin configuration, ensuring PCB footprint compatibility. TSSOP (Thin Shrink Small Outline Package) and LSSOP (Leaded Small Outline Package) differ in lead geometry and pitch specifications. Verify PCB design files support the specific package variant before substitution.

Q: Does the extended voltage range of BR93L46RFV-WE2 (1.8V ~ 5.5V) provide an advantage?

A: The extended lower voltage capability (1.8V minimum versus 4.5V minimum) is beneficial only for applications operating at reduced supply voltages. If your system operates at 4.5V or higher, both parts perform identically within the overlapping voltage range.

Q: Are both parts RoHS compliant?

A: Yes. Both 93C46BT-E/ST and BR93L46RFV-WE2 are ROHS3 compliant and REACH unaffected, meeting standard environmental regulations for electronic components.

Q: What does "Not For New Designs" status mean for BR93L46RFV-WE2?

A: This designation indicates the Rohm part is suitable for sustaining existing production and field support but should not be selected for new product development. The 93C46BT-E/ST (Active status) is the recommended choice for new designs.

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