24LC01BT/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC01BT/ST is a 1Kbit I2C EEPROM memory IC manufactured by Microchip Technology, packaged in 8-TSSOP surface mount configuration. This non-volatile memory device operates at 400 kHz I2C clock frequency with 4.6 µs access time and supports supply voltages from 2.5V to 5.5V across the 0°C to 70°C operating temperature range. The part is ROHS3 compliant and currently in active product status with 974 units in stock.

Substitute parts are necessary when the original 24LC01BT/ST becomes unavailable, when extended temperature range operation is required, or when alternative packaging options from qualified manufacturers are needed for supply chain continuity.

Key Parameters

Parameter	24LC01BT/ST
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 for the 24LC01BT/ST is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Size: 1Kbit (128 x 8 organization)
Memory Interface: I2C protocol
Package Type: 8-TSSOP form factor
Mounting Type: Surface Mount
Write Cycle Time: 5ms

Performance Parameters (Flexible):

Clock Frequency: 400 kHz minimum
Access Time: 4.6 µs or faster
Voltage Supply Range: Must encompass 2.5V ~ 5.5V or be compatible with system requirements
Operating Temperature: Extended ranges acceptable for wider application support

Compliance Requirements:

RoHS3 Compliant
REACH Unaffected status

Parts meeting these criteria are functionally interchangeable at the system level, though performance characteristics and temperature ratings may vary.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status
24LC01BT/ST	Microchip Technology	1Kbit	400 kHz	4.6 µs	2.5V ~ 5.5V	0°C ~ 70°C	8-TSSOP	Active
24LC014T-I/ST	Microchip Technology	1Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-TSSOP	Active
24LC01BT-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

Microchip Technology 24LC01BT-I/ST is the primary substitute for the 24LC01BT/ST. Both parts share identical electrical specifications and package configuration. The 24LC01BT-I/ST extends the operating temperature range to -40°C ~ 85°C, providing broader application support while maintaining full compatibility with the original part's I2C interface and memory organization.

Microchip Technology 24LC014T-I/ST offers improved access time performance (900 ns versus 4.6 µs) with extended temperature range operation. This part is suitable for applications requiring faster memory access while maintaining the same 1Kbit capacity and I2C protocol.

Microchip Technology AT24CS01-XHM-T provides the highest clock frequency (1 MHz) and fastest access time (550 ns) among Microchip options, with extended voltage supply range (1.7V ~ 5.5V). This part is appropriate for high-speed I2C applications requiring superior performance margins.

STMicroelectronics M24C01-RDW6TP is an active product offering 900 ns access time with extended temperature range and lower minimum supply voltage (1.8V). This part maintains full I2C protocol compatibility and 8-TSSOP packaging.

STMicroelectronics M24C01-WDW6TP is marked as "Not For New Designs" and should not be selected for new applications despite high inventory availability.

Rohm Semiconductor BR24G01FVT-3GE2, BR24L01AFVT-WE2, and BR24T01FVT-WE2 are alternative-source options using 8-TSSOP-B package variant. These parts maintain 400 kHz I2C operation and extended temperature range but use a different package designation. Physical compatibility with standard 8-TSSOP footprints requires verification.

All recommended substitutes are ROHS3 compliant and REACH unaffected, matching the original part's regulatory status.

Frequently Asked Questions (FAQ)

Q: Can I use 24LC014T-I/ST as a direct replacement for 24LC01BT/ST?

A: Yes. Both parts share 1Kbit capacity, 128 x 8 organization, I2C interface, 400 kHz clock frequency, 5ms write cycle time, and 8-TSSOP packaging. The 24LC014T-I/ST offers faster access time (900 ns versus 4.6 µs) and extended temperature range (-40°C ~ 85°C versus 0°C ~ 70°C), making it functionally compatible and suitable for replacement.

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

A: Both designations refer to 8-pin thin shrink small outline packages with 0.173" width and 4.40mm body dimensions. The "-B" suffix indicates a variant designation used by Rohm Semiconductor. Physical compatibility with standard 8-TSSOP PCB footprints should be confirmed with package drawings before design implementation.

Q: Why does AT24CS01-XHM-T have a lower minimum voltage (1.7V) than the original part (2.5V)?

A: The AT24CS01-XHM-T supports a wider voltage supply range (1.7V ~ 5.5V) compared to the 24LC01BT/ST (2.5V ~ 5.5V). This extended lower voltage capability allows operation in low-power applications. Systems designed for 2.5V ~ 5.5V operation remain fully compatible.

Q: Is M24C01-WDW6TP suitable for new designs?

A: No. M24C01-WDW6TP is marked as "Not For New Designs" by STMicroelectronics. Use M24C01-RDW6TP instead, which is an active product with equivalent electrical specifications and superior availability for long-term supply continuity.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: 1Kbit memory capacity, 128 x 8 organization, I2C protocol interface, 400 kHz minimum clock frequency, 5ms write cycle time, 8-TSSOP package form factor, surface mount mounting type, and ROHS3 compliance. Access time, voltage supply range, and operating temperature may vary between substitutes based on application requirements.

Q: Can I use parts with higher clock frequencies (1 MHz) as substitutes?

A: Yes. Parts with higher clock frequencies (such as AT24CS01-XHM-T at 1 MHz) are backward compatible with 400 kHz I2C systems. The I2C bus operates at the lower negotiated speed, and faster parts do not introduce compatibility issues.

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