AT24C01B-TH-B EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AT24C01B-TH-B is a 1Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, featuring I2C serial interface communication at 1 MHz clock frequency. This device is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing design requirements and production continuity. The part operates across a wide supply voltage range of 1.8V to 5.5V and maintains functionality across industrial temperature ranges from -40°C to 85°C. Surface mount packaging in 8-TSSOP configuration enables integration into compact electronic assemblies.

Key Parameters

Parameter	Value
Memory Type	Non-Volatile EEPROM
Memory Size	1Kbit
Memory Organization	128 x 8
Memory Interface	I2C
Clock Frequency	1 MHz
Access Time	550 ns
Write Cycle Time	5 ms
Voltage Supply Range	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package Type	8-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the AT24C01B-TH-B is determined by strict equivalence across the following critical parameters: memory capacity (1Kbit), memory organization (128 x 8 bits), interface protocol (I2C), package configuration (8-TSSOP), mounting technology (surface mount), and operating temperature range (-40°C to 85°C).

Substitute parts are grouped into two functional categories based on clock frequency performance:

Category 1: 1 MHz Clock Frequency Equivalents — Parts maintaining the original 1 MHz I2C clock speed with 550 ns access time. These provide direct functional replacement with identical performance characteristics.

Category 2: 400 kHz Clock Frequency Alternatives — Parts operating at reduced 400 kHz I2C clock speed with access times of 900 ns or 3500 ns. These function as substitutes in applications where lower clock frequency is acceptable, provided system timing requirements do not mandate 1 MHz operation.

All substitute candidates maintain compliance with ROHS3 standards, moisture sensitivity level 1, and the specified operating temperature range. Supply voltage ranges vary slightly between manufacturers but all support the minimum 1.8V to 5.5V envelope or equivalent.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Package	Product Status
AT24C01B-TH-B	Microchip Technology	1Kbit	1 MHz	550 ns	1.8V ~ 5.5V	8-TSSOP	Obsolete
24AA014H-I/ST	Microchip Technology	1Kbit	400 kHz	900 ns	1.7V ~ 5.5V	8-TSSOP	Active
24AA01-I/ST	Microchip Technology	1Kbit	400 kHz	3500 ns	1.7V ~ 5.5V	8-TSSOP	Active
24AA014-I/ST	Microchip Technology	1Kbit	400 kHz	900 ns	1.7V ~ 5.5V	8-TSSOP	Active
24AA01H-I/ST	Microchip Technology	1Kbit	400 kHz	900 ns	1.7V ~ 5.5V	8-TSSOP	Active
24AA01T-I/ST	Microchip Technology	1Kbit	400 kHz	3500 ns	1.7V ~ 5.5V	8-TSSOP	Active
AT24CS01-XHM-T	Microchip Technology	1Kbit	1 MHz	550 ns	1.7V ~ 5.5V	8-TSSOP	Active
BR24G01FVT-3AGE2	Rohm Semiconductor	1Kbit	1 MHz	Not Specified	1.6V ~ 5.5V	8-TSSOP-B	Active
BR24G01FVT-3GE2	Rohm Semiconductor	1Kbit	400 kHz	Not Specified	1.6V ~ 5.5V	8-TSSOP-B	Active
BR24T01FVT-WE2	Rohm Semiconductor	1Kbit	400 kHz	Not Specified	1.6V ~ 5.5V	8-TSSOP-B	Active
M24C01-RDW6TP	STMicroelectronics	1Kbit	400 kHz	900 ns	1.8V ~ 5.5V	8-TSSOP	Active

Engineering Selection Recommendations

For Direct Performance Equivalence (1 MHz Operation):

AT24CS01-XHM-T is the primary active equivalent, manufactured by Microchip Technology with identical 1 MHz clock frequency and 550 ns access time. This part maintains full functional compatibility with the obsolete AT24C01B-TH-B across all critical electrical parameters. Product status is active with substantial inventory availability (25,400 pcs), ensuring supply continuity. ROHS3 compliance and moisture sensitivity level 1 certification match the original specification.

BR24G01FVT-3AGE2 from Rohm Semiconductor provides alternative 1 MHz operation in 8-TSSOP-B package configuration. This part extends the supply voltage range to 1.6V minimum and maintains active product status. Package variant (8-TSSOP-B) requires verification of PCB footprint compatibility before implementation.

For Reduced Clock Frequency Operation (400 kHz):

Microchip Technology offers multiple 400 kHz alternatives: 24AA014H-I/ST, 24AA014-I/ST, and 24AA01H-I/ST all provide 900 ns access time with active product status. The 24AA01-I/ST and 24AA01T-I/ST variants operate at 400 kHz with extended 3500 ns access time. Selection among these options depends on system timing requirements and packaging preference (tube versus tape & reel).

M24C01-RDW6TP from STMicroelectronics provides 400 kHz operation at 900 ns access time with the highest inventory level (53,100 pcs) and maintains voltage supply compatibility at 1.8V to 5.5V.

BR24G01FVT-3GE2 and BR24T01FVT-WE2 from Rohm Semiconductor offer 400 kHz alternatives in 8-TSSOP-B package with extended voltage range to 1.6V minimum.

All recommended substitutes maintain ROHS3 compliance and moisture sensitivity level 1 certification, ensuring regulatory and environmental compatibility with the original design specification.

Frequently Asked Questions (FAQ)

Q: Can 400 kHz clock frequency parts directly replace the 1 MHz AT24C01B-TH-B?

A: 400 kHz parts function as substitutes only when system I2C bus timing does not require 1 MHz operation. The reduced clock frequency extends data transfer cycles proportionally. Verify that application firmware and I2C master controller support 400 kHz operation before implementation. If 1 MHz performance is mandatory, select AT24CS01-XHM-T or BR24G01FVT-3AGE2.

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

A: Both packages maintain identical 0.173" width and 4.40mm physical dimensions, suitable for standard 8-TSSOP PCB footprints. The "-B" designation indicates Rohm Semiconductor's package variant. Verify PCB layout compatibility with component supplier documentation before design implementation.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed maintain ROHS3 compliance status, matching the original AT24C01B-TH-B specification. Moisture sensitivity level 1 (unlimited) is consistent across all alternatives, eliminating special handling requirements during assembly and storage.

Q: What is the minimum supply voltage for substitute parts?

A: Microchip Technology substitutes (24AA series and AT24CS01-XHM-T) support 1.7V minimum supply voltage. STMicroelectronics M24C01-RDW6TP maintains 1.8V minimum. Rohm Semiconductor parts (BR24 series) extend to 1.6V minimum. Verify that application power supply design accommodates the selected part's minimum voltage specification.

Q: Which substitute offers the highest inventory availability?

A: M24C01-RDW6TP from STMicroelectronics provides the largest inventory stock at 53,100 pcs, followed by AT24CS01-XHM-T at 25,400 pcs. Both parts are active products with established supply chains suitable for production volume requirements.

Q: Can access time differences between 550 ns, 900 ns, and 3500 ns affect system operation?

A: Access time specifies the delay from I2C address/command transmission to data availability. Longer access times (900 ns, 3500 ns) require proportionally extended I2C read cycle timing. Verify that I2C master controller firmware accommodates the selected part's access time specification. For time-critical applications, 550 ns parts (AT24CS01-XHM-T, BR24G01FVT-3AGE2) maintain original performance characteristics.

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