AT24C01B-PU Equivalent & Substitute Parts Reference

Part Overview

The AT24C01B-PU by Microchip Technology is an EEPROM Memory IC providing 1Kbit non-volatile storage using an I2C interface, operating at up to 1 MHz, with a 550 ns access time and an 8-PDIP package for through-hole mounting. This part is classified as obsolete. As a result, engineers must identify equivalent or substitute EEPROM components with matching electrical specifications, package type, and compliance in order to support ongoing production and repairs.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Memory Type	EEPROM (Non-Volatile)
Memory Size	1Kbit (128 x 8)
Memory Interface	I2C
Clock Frequency	1 MHz
Write Cycle Time	5 ms
Access Time	550 ns
Voltage - Supply	1.8V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitute parts for the AT24C01B-PU are grouped strictly by the following key parameters:

Memory Type (EEPROM, Non-Volatile)
Memory Size and Organization (1Kbit or 2Kbit where interface and package are equivalent)
I2C Interface
Supported Clock Frequency (400 kHz to 1 MHz)
Voltage Supply Range (inclusive of 1.8V ~ 5.5V)
Access Time and Write Cycle Time
Package Type and Mounting Method (8-DIP, through hole, or equivalent)
Compliance and certification status (RoHS3, REACH, ECCN)

Parameter Comparison

Part Number	Memory Size	Memory Interface	Clock Frequency	Write Cycle Time (ms)	Access Time (ns)	Voltage - Supply (V)	Operating Temp (°C)	Mounting Type	Package/Case	RoHS Status	MSL	REACH Status	Status
AT24C01B-PU	1Kbit	I2C	1 MHz	5	550	1.8 ~ 5.5	-40 ~ 85	Through Hole	8-DIP	ROHS3	1	Unaffected	Obsolete
24AA014H-I/P	1Kbit	I2C	400 kHz	5	900	1.7 ~ 5.5	-40 ~ 85	Through Hole	8-DIP	ROHS3	1	Unaffected	Active
AT24HC02C-PUM	2Kbit	I2C	1 MHz	5	550	1.7 ~ 5.5	-40 ~ 85	Through Hole	8-DIP	ROHS3	1	Unaffected	Active
24AA01-I/P	1Kbit	I2C	400 kHz	5	3500	1.7 ~ 5.5	-40 ~ 85	Through Hole	8-DIP	ROHS3	1	Unaffected	Active
24AA014-I/P	1Kbit	I2C	400 kHz	5	900	1.7 ~ 5.5	-40 ~ 85	Through Hole	8-DIP	ROHS3	1	Unaffected	Active
24AA01H-I/P	1Kbit	I2C	400 kHz	5	900	1.7 ~ 5.5	-40 ~ 85	Through Hole	8-DIP	ROHS3	1	Unaffected	Active

Engineering Selection Recommendations

When selecting substitutes for the AT24C01B-PU, use only parts that are listed as "Active," are ROHS3 compliant, and have REACH Unaffected status. Select packages and mounting type (8-DIP through hole) to match existing PCB footprints. Confirm supply voltage compatibility (1.7V to 5.5V is the common range among listed parts). All parts listed meet Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life for handling.

Frequently Asked Questions (FAQ)

Q1: Which parameters are critical for substituting AT24C01B-PU?
A1: Critical parameters include memory size (1Kbit preferred for direct functional compatibility), I2C interface, supply voltage, package type, temperature range, clock frequency, and compliance with ROHS3 and REACH requirements.

Q2: Are all substitute parts pin-to-pin compatible?
A2: Substitute parts with the same mounting type and package (8-DIP through hole) maintain direct compatibility for PCB footprints.

Q3: Can parts with different clock frequencies be used as substitutes?
A3: Substitute parts with lower clock frequencies (e.g., 400 kHz) maintain compatibility with systems not requiring the maximum 1 MHz I2C rate. For maximum clock performance, select parts supporting 1 MHz.

Q4: What are the package considerations for these EEPROM memory ICs?
A4: The AT24C01B-PU and its direct substitutes are listed in the 8-DIP (0.300", 7.62mm) through-hole package, ensuring mounting type interchangeability.

Q5: Does the supply voltage range affect substitution?
A5: All substitute parts support supply voltages within or beyond the original part's 1.8V ~ 5.5V range, ensuring electrical compatibility.

Q6: Which part statuses are suitable for new designs or replacement?
A6: Only parts with "Active" status should be selected for ongoing production or repair; obsolete components should not be used in new designs.

Q7: What compliance standards do these substitutes meet?
A7: All listed substitutes are ROHS3 compliant and REACH Unaffected, meeting standard environmental and safety requirements.

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