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

Part Overview

The 93C56B-I/ST is a 2Kbit EEPROM memory IC manufactured by Microchip Technology, featuring Microwire serial interface protocol and operating at 2 MHz clock frequency. This non-volatile memory device is packaged in 8-TSSOP surface mount configuration and is currently in active product status. Finding equivalent and substitute parts becomes necessary when addressing supply chain constraints, design optimization requirements, or when transitioning to alternative manufacturers while maintaining functional compatibility within system specifications.

Key Parameters

Parameter	93C56B-I/ST
Manufacturer	Microchip Technology
Memory Size	2Kbit
Memory Organization	128 x 16
Memory Interface	Microwire
Clock Frequency	2 MHz
Write Cycle Time	2ms
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP
Product Status	Active
RoHS Compliance	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 93C56B-I/ST is determined by the following critical parameters: memory size (2Kbit), memory organization (128 x 16), Microwire interface protocol, and 8-TSSOP package footprint. All substitute parts must maintain these core specifications to ensure functional compatibility at the circuit board level.

Secondary parameters including clock frequency, write cycle time, voltage supply range, and operating temperature define performance characteristics and application suitability. Substitute parts may exceed the original specifications in these areas, provided they remain within acceptable system design margins.

The substitute parts identified fall into the following categories:

Direct Functional Equivalents (Same Clock Frequency - 2 MHz):

93LC56B-I/ST (Microchip Technology) — Extended voltage range, longer write cycle time
BR93L56RFVT-WE2 (Rohm Semiconductor) — Extended voltage range, automotive-grade alternative

Enhanced Performance Alternatives (Higher Clock Frequency - 3 MHz):

BR93G56FVT-3AGE2 (Rohm Semiconductor) — Extended voltage range, higher clock frequency
BR93G56FVT-3BGE2 (Rohm Semiconductor) — Extended voltage range, higher clock frequency, obsolete status

Automotive-Grade Alternative (2 MHz, AEC-Q100 Qualified):

BR93A56RFVT-WME2 (Rohm Semiconductor) — Extended voltage range, automotive qualification, extended temperature range

Parameter Comparison

Parameter	93C56B-I/ST	93LC56B-I/ST	BR93A56RFVT-WME2	BR93L56RFVT-WE2	BR93G56FVT-3AGE2	BR93G56FVT-3BGE2
Manufacturer	Microchip	Microchip	Rohm	Rohm	Rohm	Rohm
Memory Size	2Kbit	2Kbit	2Kbit	2Kbit	2Kbit	2Kbit
Memory Organization	128 x 16	128 x 16	128 x 16	128 x 16	128 x 16	128 x 16
Memory Interface	Microwire	Microwire	Microwire	Microwire	Microwire	Microwire
Clock Frequency	2 MHz	2 MHz	2 MHz	2 MHz	3 MHz	3 MHz
Write Cycle Time	2ms	6ms	5ms	5ms	5ms	5ms
Voltage Supply Range	4.5V ~ 5.5V	2.5V ~ 5.5V	2.5V ~ 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 ~ 105°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP	8-TSSOP
Product Status	Active	Active	Active	Active	Active	Obsolete
RoHS Compliance	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Same Performance Profile): Select 93LC56B-I/ST when maintaining Microchip Technology sourcing is preferred. This part offers identical clock frequency and package configuration with extended voltage supply range (2.5V ~ 5.5V) compared to the original 93C56B-I/ST. The longer write cycle time (6ms versus 2ms) must be evaluated against system timing requirements.

For Extended Voltage Range Applications: BR93L56RFVT-WE2 provides the widest voltage supply range (1.8V ~ 5.5V) among 2 MHz alternatives, enabling operation in low-power system designs. This Rohm Semiconductor part maintains active product status and verified programmability.

For Automotive and Extended Temperature Applications: BR93A56RFVT-WME2 is qualified to AEC-Q100 automotive standards with extended operating temperature range (-40°C ~ 105°C). This part is suitable for automotive-grade designs requiring manufacturer qualification documentation.

For Higher Clock Frequency Requirements: BR93G56FVT-3AGE2 operates at 3 MHz clock frequency, providing enhanced performance headroom for timing-critical applications. This part maintains active product status and offers extended voltage supply range (1.7V ~ 5.5V).

Parts to Avoid: BR93G56FVT-3BGE2 carries obsolete product status and should not be selected for new designs or long-term supply chain planning.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a higher clock frequency than the original 93C56B-I/ST?

A: Yes. Parts operating at 3 MHz (BR93G56FVT-3AGE2, BR93G56FVT-3BGE2) are backward compatible with 2 MHz system designs. The higher clock frequency provides performance margin without affecting functional compatibility, provided the system controller supports the Microwire interface protocol.

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

A: Write cycle time defines the duration required to complete a single word or page write operation. The 93C56B-I/ST specifies 2ms, while most substitutes specify 5ms or 6ms. System firmware must accommodate the longer write cycle time through appropriate timing delays. This affects write operation throughput but does not impact read operations or functional compatibility.

Q: Are all substitute parts pin-compatible with the 93C56B-I/ST?

A: Yes. All identified substitute parts use the 8-TSSOP package with identical pinout configuration. Physical board-level compatibility is maintained across all alternatives.

Q: Which substitute part offers the lowest minimum supply voltage?

A: BR93G56FVT-3AGE2 and BR93G56FVT-3BGE2 support minimum supply voltage of 1.7V. BR93L56RFVT-WE2 supports 1.8V minimum. These extended voltage ranges enable operation in low-power applications where the original 93C56B-I/ST (4.5V minimum) cannot be used.

Q: Is RoHS compliance maintained across all substitute parts?

A: Yes. All identified substitute parts maintain ROHS3 compliance status, consistent with the original 93C56B-I/ST.

Q: Should I select a substitute part with extended temperature range?

A: Extended temperature range (BR93A56RFVT-WME2 at -40°C ~ 105°C) is beneficial only if your application requires operation above 85°C. For standard industrial applications operating within -40°C ~ 85°C, standard temperature-range parts are appropriate.

Q: What is the difference between Microchip and Rohm Semiconductor alternatives?

A: Both manufacturers produce functionally equivalent 2Kbit Microwire EEPROM devices in 8-TSSOP packaging. Rohm alternatives offer extended voltage supply ranges and, in the case of BR93A56RFVT-WME2, automotive qualification. Selection depends on supply chain availability, voltage requirements, and qualification documentation needs.

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