24C01CT-I/ST EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24C01CT-I/ST is a 1Kbit I2C EEPROM memory IC manufactured by Microchip Technology, packaged in 8-TSSOP surface mount configuration. This device operates at 400 kHz I2C clock frequency with 900 ns access time and supports supply voltages from 4.5V to 5.5V. The part is Active status and RoHS3 compliant. Substitute parts are necessary when the original part becomes unavailable, when alternative voltage ranges are required, or when different packaging formats (Tape & Reel vs. Cut Tape) are preferred for production workflows.

Key Parameters

Parameter	24C01CT-I/ST
Memory Size	1Kbit
Memory Organization	128 x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	900 ns
Write Cycle Time	1 ms
Voltage Supply Range	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 24C01CT-I/ST is determined by the following critical parameters:

Core Compatibility Requirements:

Memory Size: 1Kbit (128 x 8 organization)
Memory Interface: I2C protocol
Package / Case: 8-TSSOP form factor (0.173", 4.40mm Width)
Operating Temperature Range: -40°C ~ 85°C
Mounting Type: Surface Mount

Flexible Parameters (Allow Substitution):

Clock Frequency: 400 kHz or higher (backward compatible)
Access Time: 900 ns or faster (backward compatible)
Write Cycle Time: 1 ms or longer (backward compatible)
Voltage Supply Range: Must encompass or exceed 4.5V ~ 5.5V minimum requirement
Packaging Format: Cut Tape (CT) or Tape & Reel (TR) are interchangeable
Manufacturer: Different manufacturers acceptable if electrical specifications align

Substitute parts must maintain identical memory capacity, I2C interface protocol, and physical package dimensions. Voltage supply ranges may be broader than the original specification. Clock frequency and access time improvements are acceptable as they maintain backward compatibility.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Write Cycle Time	Voltage Supply	Package	Product Status
24C01CT-I/ST	Microchip Technology	1Kbit	400 kHz	900 ns	1 ms	4.5V ~ 5.5V	8-TSSOP	Active
24LC014T-I/ST	Microchip Technology	1Kbit	400 kHz	900 ns	5 ms	2.5V ~ 5.5V	8-TSSOP	Active
24LC01BT-I/ST	Microchip Technology	1Kbit	400 kHz	4.6 µs	5 ms	2.5V ~ 5.5V	8-TSSOP	Active
AT24CS01-XHM-T	Microchip Technology	1Kbit	1 MHz	550 ns	5 ms	1.7V ~ 5.5V	8-TSSOP	Active
BR24G01FVT-3GE2	Rohm Semiconductor	1Kbit	400 kHz	Not specified	5 ms	1.6V ~ 5.5V	8-TSSOP	Active
BR24L01AFVT-WE2	ROHM Semiconductor	1Kbit	400 kHz	Not specified	5 ms	1.8V ~ 5.5V	8-TSSOP	Active
BR24T01FVT-WE2	Rohm Semiconductor	1Kbit	400 kHz	Not specified	5 ms	1.6V ~ 5.5V	8-TSSOP	Active
M24C01-RDW6TP	STMicroelectronics	1Kbit	400 kHz	900 ns	5 ms	1.8V ~ 5.5V	8-TSSOP	Active
M24C01-WDW6TP	STMicroelectronics	1Kbit	400 kHz	900 ns	5 ms	2.5V ~ 5.5V	8-TSSOP	Not For New Designs

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Recommended for New Designs):

24LC014T-I/ST and 24LC01BT-I/ST from Microchip Technology maintain the same manufacturer ecosystem as the original part. Both are Active status and RoHS3 compliant. The 24LC014T-I/ST offers identical clock frequency and access time with extended voltage range (2.5V ~ 5.5V). The 24LC01BT-I/ST provides broader voltage compatibility with slightly longer access time (4.6 µs).

AT24CS01-XHM-T from Microchip Technology offers superior performance with 1 MHz clock frequency and 550 ns access time, supporting the widest voltage range (1.7V ~ 5.5V). This part is suitable for applications requiring higher I2C bus speeds while maintaining full backward compatibility.

Tier 2 - Cross-Manufacturer Alternatives (Active Status):

M24C01-RDW6TP from STMicroelectronics matches the original 900 ns access time specification with 400 kHz clock frequency. Voltage range is 1.8V ~ 5.5V. This part is Active status and RoHS3 compliant.

BR24G01FVT-3GE2, BR24L01AFVT-WE2, and BR24T01FVT-WE2 from Rohm Semiconductor provide 1Kbit I2C EEPROM functionality in 8-TSSOP packaging with 400 kHz clock frequency. All three are Active status and RoHS3 compliant with voltage ranges spanning 1.6V to 1.8V minimum thresholds.

Tier 3 - Legacy Status:

M24C01-WDW6TP from STMicroelectronics is marked "Not For New Designs" and should be avoided for new product development despite high inventory availability.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 24C01CT-I/ST with any 1Kbit I2C EEPROM in 8-TSSOP packaging?

A: No. Substitutes must maintain identical memory organization (128 x 8), I2C interface protocol, and 8-TSSOP physical dimensions. Additionally, the substitute's voltage supply range must support the 4.5V ~ 5.5V requirement of the original application. Clock frequency and access time may be equal or superior.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Both formats contain identical components in the same 8-TSSOP package. Cut Tape is supplied in individual strips suitable for manual assembly or small-volume production. Tape & Reel format is wound on reels for automated pick-and-place assembly. Selection depends on production volume and assembly equipment capability, not electrical performance.

Q: Is the AT24CS01-XHM-T a suitable replacement if my application only requires 400 kHz I2C operation?

A: Yes. The AT24CS01-XHM-T operates at 1 MHz maximum clock frequency but is fully backward compatible with 400 kHz I2C bus speeds. The faster access time (550 ns vs. 900 ns) and broader voltage range (1.7V ~ 5.5V) provide additional design margin without compromising compatibility.

Q: Why does the 24LC01BT-I/ST have a longer access time (4.6 µs) than the original part (900 ns)?

A: Access time specifications reflect different measurement methodologies or device variants within the same memory capacity and interface family. The 24LC01BT-I/ST remains functionally compatible as I2C protocol timing is determined by clock frequency (400 kHz) rather than access time alone. Applications with strict timing requirements should verify compatibility with specific system timing parameters.

Q: Can I use M24C01-WDW6TP as a substitute despite its "Not For New Designs" status?

A: The M24C01-WDW6TP is electrically compatible and currently in stock with high inventory (111,051 pcs). However, it is designated "Not For New Designs" by the manufacturer, indicating potential end-of-life trajectory. For new product development, select from Active status alternatives such as M24C01-RDW6TP, 24LC014T-I/ST, or AT24CS01-XHM-T.

Q: What voltage range should I specify for a design requiring maximum flexibility?

A: The AT24CS01-XHM-T supports the broadest voltage range (1.7V ~ 5.5V) among all listed substitutes. If your application requires operation below 1.7V, the BR24G01FVT-3GE2 or BR24T01FVT-WE2 support 1.6V minimum. For applications requiring 4.5V ~ 5.5V operation only, all listed substitutes are acceptable.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message