93C56B-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93C56B-E/ST is a 2Kbit non-volatile EEPROM memory IC manufactured by Microchip Technology, designed for Microwire serial interface applications. This device operates at 2 MHz clock frequency with a supply voltage range of 4.5V to 5.5V and is housed in an 8-TSSOP surface mount package. The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when they maintain equivalent memory capacity, organization, interface protocol, and package form factor while meeting the same or broader operational specifications. Alternative sources become necessary for supply chain continuity, extended lead time mitigation, or when primary manufacturer inventory is constrained.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	2Kbit
Memory Organization	128 x 16
Memory Interface	Microwire
Clock Frequency	2 MHz
Supply Voltage Range	4.5V ~ 5.5V
Operating Temperature Range	-40°C ~ 125°C
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Write Cycle Time	2ms
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93C56B-E/ST is determined by strict equivalence across the following critical parameters:

Memory Capacity & Organization: Must be 2Kbit with 128 x 16 organization
Serial Interface Protocol: Must support Microwire interface at 2 MHz operation
Package Form Factor: Must be 8-TSSOP with identical 0.173" (4.40mm) width
Surface Mount Compatibility: Must use surface mount technology
Supply Voltage Compatibility: Must operate within or encompass the 4.5V ~ 5.5V range
Regulatory Compliance: Must maintain RoHS3 compliance status

The BR93L56RFVT-WE2 from Rohm Semiconductor meets all substitution criteria. While this part exhibits a broader supply voltage range (1.8V ~ 5.5V) and different write cycle time (5ms versus 2ms), it maintains full functional equivalence for the specified 4.5V ~ 5.5V operating window and identical memory architecture, interface protocol, and package specifications.

Parameter Comparison

Parameter	93C56B-E/ST (Microchip)	BR93L56RFVT-WE2 (Rohm)	Compatibility Notes
Memory Type	Non-Volatile EEPROM	Non-Volatile EEPROM	Equivalent
Memory Size	2Kbit	2Kbit	Equivalent
Memory Organization	128 x 16	128 x 16	Equivalent
Memory Interface	Microwire	Microwire	Equivalent
Clock Frequency	2 MHz	2 MHz	Equivalent
Supply Voltage Range	4.5V ~ 5.5V	1.8V ~ 5.5V	Rohm part supports broader range; compatible within 4.5V ~ 5.5V window
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 85°C	Microchip part supports extended upper temperature limit
Write Cycle Time	2ms	5ms	Rohm part has longer write cycle; acceptable for non-time-critical applications
Package / Case	8-TSSOP (0.173", 4.40mm)	8-TSSOP (0.173", 4.40mm)	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
MSL Rating	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

Primary Part (93C56B-E/ST): Select when extended operating temperature range (-40°C to 125°C) is required or when faster write cycle time (2ms) is critical to application performance. Microchip Technology maintains active production status with verified inventory availability.

Substitute Part (BR93L56RFVT-WE2): Select for supply chain diversification or when primary manufacturer lead times exceed project requirements. This part is suitable for applications operating within the -40°C to 85°C temperature window and where 5ms write cycle time does not impact system performance. Rohm Semiconductor maintains active production status with verified inventory availability. Both parts carry identical RoHS3 compliance and unlimited moisture sensitivity ratings, ensuring equivalent environmental and regulatory qualification.

Frequently Asked Questions (FAQ)

Q: Can BR93L56RFVT-WE2 be used as a direct drop-in replacement for 93C56B-E/ST?

A: Yes, within the specified operating conditions. Both parts share identical memory capacity (2Kbit), organization (128 x 16), Microwire interface protocol, 2 MHz clock frequency, and 8-TSSOP package form factor. The substitute part operates within the 4.5V ~ 5.5V supply range of the primary part. Applications must accommodate the longer write cycle time (5ms versus 2ms) and reduced maximum operating temperature (85°C versus 125°C).

Q: What are the key differences between these two parts?

A: The primary differences are: (1) Supply voltage range—Rohm part supports 1.8V ~ 5.5V versus Microchip's 4.5V ~ 5.5V; (2) Operating temperature maximum—Microchip supports 125°C versus Rohm's 85°C; (3) Write cycle time—Microchip specifies 2ms versus Rohm's 5ms. All other electrical and mechanical parameters are equivalent.

Q: Are there any package or pinout differences?

A: No. Both parts use the 8-TSSOP package with identical 0.173" (4.40mm) width and surface mount configuration. Pinout and package dimensions are equivalent, enabling direct PCB footprint compatibility.

Q: Which part should I select for high-temperature applications?

A: The 93C56B-E/ST supports operation up to 125°C and is the appropriate choice for applications requiring extended temperature range. The BR93L56RFVT-WE2 is limited to 85°C maximum operating temperature.

Q: Does write cycle time affect circuit design?

A: Write cycle time affects data programming speed but not circuit compatibility. If your application performs infrequent EEPROM writes or does not require rapid sequential write operations, the longer 5ms cycle time of the Rohm part is acceptable. Time-critical write operations should use the Microchip part with 2ms cycle time.

Q: Are both parts RoHS compliant?

A: Yes. Both 93C56B-E/ST and BR93L56RFVT-WE2 are ROHS3 compliant with unlimited moisture sensitivity (MSL 1), meeting identical environmental and regulatory requirements.

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