24LC01B/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC01B/ST is a 1Kbit I2C EEPROM memory integrated circuit manufactured by Microchip Technology. This non-volatile memory device operates at 400 kHz clock frequency with 4.6 µs access time and supports a supply voltage range of 2.5V to 5.5V. The device is housed in an 8-TSSOP surface mount package and maintains active product status with ROHS3 compliance.

Substitute parts are necessary when the primary part becomes unavailable, when extended operating temperature ranges are required, or when alternative packaging formats better suit manufacturing requirements. The following equivalent devices maintain functional compatibility through identical memory capacity, I2C interface protocol, and package form factor.

Key Parameters

Parameter	Value
Memory Size	1Kbit
Memory Organization	128 x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	4.6 µs
Write Cycle Time	5ms
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	0°C ~ 70°C
Package Type	8-TSSOP
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Memory capacity (1Kbit) and organization (128 x 8 bits)
I2C serial interface protocol
8-TSSOP package form factor with 0.173" width and 4.40mm dimensions
Non-volatile EEPROM technology
Surface mount mounting type
ROHS3 and REACH compliance status

Substitute parts must maintain these core specifications. Variations in clock frequency, access time, voltage supply range, and operating temperature range are permitted when the application requirements allow. Parts with extended temperature ranges (-40°C to 85°C) provide broader operational flexibility compared to the base 24LC01B/ST specification (0°C to 70°C).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status
24LC01B/ST	Microchip Technology	1Kbit	400 kHz	4.6 µs	2.5V ~ 5.5V	0°C ~ 70°C	8-TSSOP	Active
24LC01B-I/ST	Microchip Technology	1Kbit	400 kHz	4.6 µs	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
AT24CS01-XHM-T	Microchip Technology	1Kbit	1 MHz	550 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
BR24G01FVT-3GE2	Rohm Semiconductor	1Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24L01AFVT-WE2	ROHM Semiconductor	1Kbit	400 kHz	Not specified	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
BR24T01FVT-WE2	Rohm Semiconductor	1Kbit	400 kHz	Not specified	1.6V ~ 5.5V	-40°C ~ 85°C	8-TSSOP-B	Active
M24C01-RDW6TP	STMicroelectronics	1Kbit	400 kHz	900 ns	1.8V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
M24C01-WDW6TP	STMicroelectronics	1Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Not For New Designs

Engineering Selection Recommendations

All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements equivalent to the 24LC01B/ST.

For new designs, prioritize parts with Active product status: 24LC01B-I/ST, AT24CS01-XHM-T, BR24G01FVT-3GE2, BR24L01AFVT-WE2, BR24T01FVT-WE2, and M24C01-RDW6TP. The M24C01-WDW6TP carries "Not For New Designs" status and should be used only for legacy system maintenance.

The 24LC01B-I/ST from Microchip Technology provides the closest functional match with identical clock frequency and access time specifications, differing only in extended operating temperature range (-40°C to 85°C versus 0°C to 70°C).

The AT24CS01-XHM-T offers enhanced performance with 1 MHz clock frequency and 550 ns access time, along with lower minimum supply voltage (1.7V), suitable for applications requiring faster I2C communication or lower power operation.

ROHM Semiconductor devices (BR24G01FVT-3GE2, BR24L01AFVT-WE2, BR24T01FVT-WE2) provide alternative sourcing with extended temperature ranges and lower minimum supply voltages (1.6V to 1.8V), available in 8-TSSOP-B package variant.

STMicroelectronics M24C01-RDW6TP maintains 400 kHz clock frequency with 900 ns access time and supports 1.8V minimum supply voltage, offering active product status with extended temperature range.

Frequently Asked Questions (FAQ)

Q: Can I substitute 24LC01B/ST with 24LC01B-I/ST in existing designs?

A: Yes. Both devices share identical memory capacity, I2C interface, clock frequency, access time, and 8-TSSOP package. The primary difference is operating temperature range: 24LC01B-I/ST extends to -40°C to 85°C versus the original 0°C to 70°C. This substitution is functionally transparent for applications operating within the original temperature specification.

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

A: Both package types maintain the same 0.173" width and 4.40mm dimensions specified for this product category. The -B variant indicates a package revision from ROHM Semiconductor. Pin compatibility and PCB footprint remain identical for substitution purposes.

Q: Why does AT24CS01-XHM-T have different electrical specifications?

A: AT24CS01-XHM-T operates at 1 MHz clock frequency with 550 ns access time, compared to 400 kHz and 4.6 µs for the base device. This represents enhanced performance capability. The device also supports lower minimum supply voltage (1.7V). These differences do not prevent substitution; they indicate the part can operate in applications with faster I2C requirements or lower voltage constraints.

Q: Is M24C01-WDW6TP suitable for new product development?

A: No. M24C01-WDW6TP carries "Not For New Designs" status. Use this part only for legacy system maintenance or repair. For new designs, select from parts with Active product status: 24LC01B-I/ST, AT24CS01-XHM-T, BR24G01FVT-3GE2, BR24L01AFVT-WE2, BR24T01FVT-WE2, or M24C01-RDW6TP.

Q: Do all substitute parts meet the same compliance requirements?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory profile of 24LC01B/ST.

Q: What supply voltage range should I use for cross-manufacturer substitution?

A: The 24LC01B/ST operates at 2.5V to 5.5V. Substitute parts from ROHM Semiconductor and STMicroelectronics support lower minimum voltages (1.6V to 1.8V). When substituting, use the voltage range that satisfies both the original specification and the substitute part's minimum requirement. For designs operating at 2.5V or higher, all listed substitutes are compatible.

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