93LC56B/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 93LC56B/ST is a 2Kbit non-volatile EEPROM memory integrated circuit manufactured by Microchip Technology. This device operates using the Microwire serial interface protocol and is housed in an 8-TSSOP surface mount package. The part is currently active in production with verified programmability status and full RoHS3 compliance.

Substitute parts are necessary when the primary part number becomes unavailable, when extended operating temperature ranges are required, or when alternative supply sources are needed to maintain design flexibility and production continuity.

Substiute Parts

93LC56B/ST

Microchip TechnologyIn Stock: 226293LC56B/ST Datasheet

Current PartRFQ

93LC56B-I/ST

Microchip TechnologyIn Stock: 128193LC56B-I/ST Datasheet

MFR RecommendedRFQ

BR93G56FVT-3AGE2

Rohm SemiconductorIn Stock: 3881BR93G56FVT-3AGE2 Datasheet

MFR RecommendedRFQ

BR93G56FVT-3BGE2

ROHM SemiconductorIn Stock: 839BR93G56FVT-3BGE2 Datasheet

MFR RecommendedRFQ

BR93L56RFVT-WE2

Rohm SemiconductorIn Stock: 1660BR93L56RFVT-WE2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 93LC56B/ST is determined by the following critical parameters:

Core Compatibility Requirements:

• Memory Size: 2Kbit (fixed requirement)
• Memory Organization: 128 x 16 (fixed requirement)
• Memory Interface: Microwire (fixed requirement)
• Package Type: 8-TSSOP (fixed requirement)
• Mounting Type: Surface Mount (fixed requirement)

Allowable Variation Parameters:

• Clock Frequency: 2 MHz or higher (3 MHz acceptable)
• Write Cycle Time: 6ms or faster (5ms acceptable)
• Supply Voltage Range: Must encompass or exceed 2.5V ~ 5.5V
• Operating Temperature: May extend beyond 0°C ~ 70°C range
• Manufacturer: Microchip Technology or Rohm Semiconductor

Parts are grouped into three categories based on these parameters: direct equivalents (identical specifications), compatible substitutes (enhanced specifications), and obsolete alternatives (no longer in production).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 93LC56B-I/ST

The 93LC56B-I/ST is the recommended direct substitute for the 93LC56B/ST. Both parts are manufactured by Microchip Technology and share identical electrical specifications including 2 MHz clock frequency, 6ms write cycle time, and 2.5V ~ 5.5V supply voltage range. The 93LC56B-I/ST offers an extended operating temperature range of -40°C ~ 85°C compared to the primary part's 0°C ~ 70°C range. Programmability has been verified for this part. Both parts maintain ROHS3 compliance and are currently in active production status.

Secondary Substitute: BR93L56RFVT-WE2

The BR93L56RFVT-WE2 manufactured by Rohm Semiconductor is a compatible substitute with verified programmability. This part maintains the 2 MHz clock frequency and 2Kbit memory capacity of the primary part. The write cycle time is improved to 5ms, and the supply voltage range extends to 1.8V ~ 5.5V, providing broader operational flexibility. Operating temperature range extends to -40°C ~ 85°C. The part is supplied in Tape & Reel packaging and maintains ROHS3 compliance with active production status.

Tertiary Substitutes: BR93G56FVT-3AGE2 and BR93G56FVT-3BGE2

The BR93G56FVT-3AGE2 and BR93G56FVT-3BGE2 are Rohm Semiconductor alternatives with enhanced clock frequency of 3 MHz and improved write cycle time of 5ms. Both parts support the extended supply voltage range of 1.7V ~ 5.5V and operating temperature range of -40°C ~ 85°C. The BR93G56FVT-3AGE2 is currently in active production with Tape & Reel packaging. The BR93G56FVT-3BGE2 is marked as obsolete and should not be selected for new designs. Programmability verification status is not confirmed for these parts.

Selection Criteria:

For applications requiring verified programmability and active production status, select either 93LC56B-I/ST or BR93L56RFVT-WE2. For designs requiring extended temperature operation beyond 0°C ~ 70°C, all substitute parts provide -40°C ~ 85°C capability. For applications with lower voltage supply requirements below 2.5V, select BR93L56RFVT-WE2 (1.8V minimum) or BR93G56FVT-3AGE2 (1.7V minimum). Avoid BR93G56FVT-3BGE2 due to obsolete status.

Frequently Asked Questions (FAQ)

Q: Can the 93LC56B-I/ST be used as a direct replacement for the 93LC56B/ST?

A: Yes. Both parts share identical memory capacity (2Kbit), organization (128 x 16), interface protocol (Microwire), clock frequency (2 MHz), write cycle time (6ms), supply voltage range (2.5V ~ 5.5V), and package type (8-TSSOP). The 93LC56B-I/ST provides an extended operating temperature range of -40°C ~ 85°C. Both parts are manufactured by Microchip Technology and maintain ROHS3 compliance.

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

A: Both package designations refer to 8-pin Thin Shrink Small Outline Package with identical physical dimensions (0.173" width, 4.40mm). The "-B" suffix used by Rohm Semiconductor indicates their specific package variant. These packages are mechanically and electrically compatible for PCB layout and assembly purposes.

Q: Are the Rohm Semiconductor parts (BR93L56RFVT-WE2 and BR93G56FVT series) compatible with designs using Microchip 93LC56B parts?

A: Yes, provided the design accommodates the following variations: Rohm parts support lower minimum supply voltages (1.8V or 1.7V versus 2.5V), extended operating temperature ranges (-40°C ~ 85°C versus 0°C ~ 70°C), and in the BR93G56FVT series, higher clock frequencies (3 MHz versus 2 MHz). All parts maintain Microwire interface compatibility and identical memory organization. Verify that your application does not require the lower voltage operation before substituting.

Q: Why is BR93G56FVT-3BGE2 marked as obsolete?

A: The BR93G56FVT-3BGE2 has been discontinued by ROHM Semiconductor and is no longer in active production. While limited inventory may remain available, this part should not be selected for new designs. Use BR93G56FVT-3AGE2 as the active alternative if the 3 MHz clock frequency and 5ms write cycle time are required.

Q: What is the significance of "Programmability Verified" status?

A: Programmability Verified indicates that the part has been tested and confirmed to support standard programming protocols and procedures. The 93LC56B/ST, 93LC56B-I/ST, and BR93L56RFVT-WE2 carry verified status. The BR93G56FVT series parts are marked as "Not Verified," meaning programmability confirmation has not been established through testing. This distinction is relevant for applications requiring guaranteed programming compatibility.

Q: Can I use a substitute part with a higher clock frequency (3 MHz) in a design specified for 2 MHz operation?

A: Yes. A part with higher clock frequency (3 MHz) is backward compatible with designs specified for lower frequency (2 MHz) operation. The device will operate correctly at the lower frequency. However, verify that your circuit design does not depend on specific timing characteristics that would be affected by the higher frequency capability.

Q: What supply voltage range should I consider when selecting a substitute?

A: The primary part 93LC56B/ST operates from 2.5V ~ 5.5V. All substitute parts support this range or extend it to lower voltages. If your design operates at voltages below 2.5V, select BR93L56RFVT-WE2 (1.8V minimum) or BR93G56FVT-3AGE2 (1.7V minimum). If your design operates only within the 2.5V ~ 5.5V range, all substitutes are suitable.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The 93LC56B/ST and all listed substitute parts (93LC56B-I/ST, BR93L56RFVT-WE2, BR93G56FVT-3AGE2, and BR93G56FVT-3BGE2) maintain ROHS3 compliance status. All parts are also REACH Unaffected and classified under ECCN EAR99.