24LC01BT-E/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC01BT-E/ST is a 1Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, designed for I2C serial communication applications. This non-volatile memory device operates across a wide voltage range of 2.5V to 5.5V and supports temperatures from -40°C to 125°C. The component is currently in active production status with 1127 units available in inventory.

Substitute parts are necessary when the primary component becomes unavailable, when design requirements demand extended temperature ranges, or when alternative sourcing improves supply chain resilience. Equivalent devices must maintain functional compatibility through matching memory capacity, interface protocol, package type, and electrical operating parameters.

Key Parameters

Parameter	Value
Memory Size	1Kbit
Memory Organization	128 x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Voltage Supply Range	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C
Write Cycle Time	5ms
Access Time	4.6 µs
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 24LC01BT-E/ST is determined by the following critical parameters:

Memory Specifications: All substitute parts must provide 1Kbit capacity with 128 x 8 organization and I2C interface protocol at 400 kHz clock frequency.

Package Compatibility: The 8-TSSOP surface mount package with 0.173" width and 4.40mm dimensions is mandatory for PCB layout compatibility.

Electrical Parameters: Voltage supply range and write cycle time must be equal to or exceed the original specification. Access time may be improved without affecting functionality.

Environmental Compliance: All parts must maintain ROHS3 compliance and REACH unaffected status.

The substitute parts identified—M24C01-RDW6TP and M24C01-WDW6TP from STMicroelectronics—meet these core substitution criteria while offering alternative sourcing options and inventory availability.

Parameter Comparison

Parameter	24LC01BT-E/ST (Microchip)	M24C01-RDW6TP (STMicroelectronics)	M24C01-WDW6TP (STMicroelectronics)
Manufacturer	Microchip Technology	STMicroelectronics	STMicroelectronics
Memory Size	1Kbit	1Kbit	1Kbit
Memory Organization	128 x 8	128 x 8	128 x 8
Memory Interface	I2C	I2C	I2C
Clock Frequency	400 kHz	400 kHz	400 kHz
Package Type	8-TSSOP	8-TSSOP	8-TSSOP
Voltage Supply Range	2.5V ~ 5.5V	1.8V ~ 5.5V	2.5V ~ 5.5V
Operating Temperature	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C
Write Cycle Time	5ms	5ms	5ms
Access Time	4.6 µs	900 ns	900 ns
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Not For New Designs
Inventory Availability	1127 Pcs	53100 Pcs	111051 Pcs

Engineering Selection Recommendations

M24C01-RDW6TP is suitable for applications requiring extended lower voltage operation (1.8V minimum) with active product status designation. This part offers superior access time performance at 900 nanoseconds and maintains full ROHS3 compliance. The higher inventory level (53100 units) provides supply chain advantages.

M24C01-WDW6TP provides the highest inventory availability (111051 units) and maintains voltage compatibility with the original specification (2.5V ~ 5.5V). However, this part carries a "Not For New Designs" product status classification, making it suitable only for legacy system maintenance or replacement applications where design finalization has already occurred.

Both STMicroelectronics alternatives operate at reduced maximum temperature (85°C versus 125°C), which represents a functional limitation for applications requiring the full thermal range of the original Microchip device.

Frequently Asked Questions (FAQ)

Q: Can M24C01-RDW6TP and M24C01-WDW6TP be used interchangeably with 24LC01BT-E/ST?

A: Both parts are functionally compatible at the I2C protocol level, sharing identical memory capacity, organization, interface frequency, and package dimensions. However, the reduced maximum operating temperature (85°C versus 125°C) must be evaluated against application requirements. M24C01-WDW6TP carries a "Not For New Designs" status and should be reserved for replacement applications only.

Q: What is the impact of the 900 nanosecond access time in the STMicroelectronics parts compared to 4.6 microseconds in the original?

A: The faster access time in M24C01-RDW6TP and M24C01-WDW6TP represents improved performance and does not create compatibility issues. Systems designed for 4.6 microsecond access time will function correctly with faster devices.

Q: Are there voltage supply differences that affect circuit design?

A: M24C01-RDW6TP supports operation down to 1.8V, enabling use in lower-voltage systems. M24C01-WDW6TP matches the original 2.5V minimum specification. Both support the full 5.5V maximum. Circuit designs operating between 2.5V and 5.5V are compatible with all three parts.

Q: What packaging considerations apply to these substitutes?

A: All three parts use identical 8-TSSOP surface mount packages with 0.173" width and 4.40mm dimensions. PCB layouts, footprints, and assembly processes require no modification for substitution.

Q: Which part should be selected for new product designs?

A: M24C01-RDW6TP is the recommended choice for new designs, maintaining active product status with STMicroelectronics while offering improved access time and extended lower voltage capability. The original 24LC01BT-E/ST remains viable if the full -40°C to 125°C temperature range is required.

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