93AA56BT-I/ST EEPROM Equivalent & Substitute Parts

Part Overview

The 93AA56BT-I/ST is a 2Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, featuring Microwire interface protocol and operating at 2 MHz clock frequency. This component is housed in an 8-TSSOP surface mount package with a supply voltage range of 1.8V to 5.5V and operating temperature range of -40°C to 85°C. The part is currently in active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are necessary when the primary part experiences supply constraints, inventory limitations, or when design flexibility permits selection from qualified alternatives meeting identical or enhanced electrical and mechanical specifications.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	2Kbit
Memory Organization	128 x 16
Memory Interface	Microwire
Clock Frequency	2 MHz
Write Cycle Time	6ms
Supply Voltage Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
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 93AA56BT-I/ST is determined by the following critical parameters: memory size (2Kbit), memory organization (128 x 16), Microwire interface protocol, 8-TSSOP package footprint, surface mount mounting type, and operating temperature range (-40°C to 85°C). Clock frequency and write cycle time are secondary parameters that may vary within acceptable ranges for compatible substitutes. Supply voltage range must maintain compatibility with the 1.8V minimum requirement. All substitute parts must maintain ROHS3 compliance and MSL 1 rating.

The substitute parts identified fall into two operational categories based on clock frequency: parts operating at 2 MHz (matching the primary part) and parts operating at 3 MHz (enhanced performance). Both categories maintain full electrical and mechanical compatibility with the 93AA56BT-I/ST within the specified parameter constraints.

Parameter Comparison

Parameter	93AA56BT-I/ST (Microchip)	BR93L56RFVT-WE2 (Rohm)	BR93G56FVT-3AGE2 (Rohm)	BR93G56FVT-3BGE2 (Rohm)
Manufacturer	Microchip Technology	Rohm Semiconductor	ROHM Semiconductor	ROHM Semiconductor
Memory Size	2Kbit	2Kbit	2Kbit	2Kbit
Memory Organization	128 x 16	128 x 16	128 x 16	128 x 16
Memory Interface	Microwire	Microwire	Microwire	Microwire
Clock Frequency	2 MHz	2 MHz	3 MHz	3 MHz
Write Cycle Time	6ms	5ms	5ms	5ms
Supply Voltage Range	1.8V ~ 5.5V	1.8V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-TSSOP	8-TSSOP-B	8-TSSOP-B	8-TSSOP-B
Product Status	Active	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

BR93L56RFVT-WE2 is the primary substitute for direct replacement of the 93AA56BT-I/ST. This Rohm Semiconductor part maintains identical clock frequency (2 MHz), supply voltage range (1.8V ~ 5.5V), and operating temperature specifications. The part is in active product status with verified DiGi-Electronics programmability and offers improved write cycle time (5ms versus 6ms). Inventory availability is 1,618 pieces.

BR93G56FVT-3AGE2 serves as an enhanced-performance substitute, operating at 3 MHz clock frequency with reduced write cycle time (5ms). This part is in active product status and maintains full electrical compatibility within the specified parameter range. Inventory availability is 3,868 pieces.

BR93G56FVT-3BGE2 is functionally equivalent to BR93G56FVT-3AGE2 but carries obsolete product status. Selection of this part is not recommended for new designs or long-term supply planning due to discontinued manufacturing status, despite current inventory availability of 801 pieces.

Frequently Asked Questions (FAQ)

Q: Can BR93G56FVT-3AGE2 or BR93G56FVT-3BGE2 be used as direct replacements for 93AA56BT-I/ST?

A: Yes, both parts are electrically and mechanically compatible. The 3 MHz clock frequency represents enhanced performance compared to the 2 MHz specification of the primary part. The 8-TSSOP-B package variant maintains identical footprint and pinout compatibility. However, BR93G56FVT-3BGE2 carries obsolete product status and should not be selected for new designs.

Q: What is the difference between 8-TSSOP and 8-TSSOP-B packages?

A: Both package variants maintain identical external dimensions (0.173", 4.40mm width) and surface mount compatibility. The -B designation indicates a package variant from Rohm Semiconductor. Footprint and pinout compatibility is maintained for PCB design purposes.

Q: Does the reduced write cycle time in substitute parts affect circuit design?

A: The write cycle time reduction from 6ms to 5ms in substitute parts represents improved performance. Existing circuit designs specified for 6ms write cycles remain fully compatible with parts offering 5ms write cycles. No design modifications are required.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all identified substitute parts (BR93L56RFVT-WE2, BR93G56FVT-3AGE2, and BR93G56FVT-3BGE2) maintain ROHS3 compliance and MSL 1 rating identical to the primary part.

Q: Which substitute part should be selected for new designs?

A: BR93L56RFVT-WE2 is recommended for new designs requiring direct specification match. BR93G56FVT-3AGE2 is recommended when enhanced performance (3 MHz operation) is acceptable and inventory availability is a consideration. BR93G56FVT-3BGE2 should not be selected due to obsolete product status.

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