24LC01B-I/SNG EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The 24LC01B-I/SNG is a 1Kbit EEPROM memory IC manufactured by Microchip Technology, featuring I2C interface operation at 400 kHz with 8-SOIC surface mount packaging. This part is classified as obsolete, though 649 units remain in stock as new original inventory. The device operates across a supply voltage range of 2.5V to 5.5V and temperature range of -40°C to 85°C, with a 5ms write cycle time and 4.6 µs access time. Due to its obsolete status, identifying functionally equivalent active production alternatives is essential for design continuity and long-term component availability.

Key Parameters

Parameter	Value
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	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 24LC01B-I/SNG is determined by strict alignment across the following critical parameters: memory size (1Kbit), memory organization (128 x 8), interface protocol (I2C), package type (8-SOIC), and mounting method (surface mount). All substitute parts must maintain compatibility with the supply voltage range (2.5V ~ 5.5V minimum) and operating temperature range (-40°C ~ 85°C minimum). Clock frequency and access time may vary within the I2C specification, as faster variants remain backward compatible. All candidates must be RoHS3 compliant and currently in active production status to ensure long-term availability.

The substitute parts are grouped into two categories based on performance characteristics:

Category A - Standard Performance (400 kHz, 4.6 µs access time): 24LC01B-E/SN operates at identical electrical specifications to the main part but with extended temperature range (-40°C ~ 125°C) and active production status.

Category B - Enhanced Performance (400 kHz or 1 MHz, 900 ns or 400 ns access time): 24AA01-I/SN, 24AA014-I/SN, 24AA014H-I/SN, 24AA01H-I/SN, 24LC014-E/SN, 24LC014-I/SN, 24LC014H-E/SN, 24LC014H-I/SN, and 24LC01BH-E/SN provide faster access times and/or higher clock frequencies while maintaining full backward compatibility with the original part's I2C protocol and pinout.

Parameter Comparison

Part Number	Manufacturer	Memory Size	Clock Frequency	Access Time	Voltage Supply	Operating Temperature	Package	Product Status	RoHS Status
24LC01B-I/SNG	Microchip Technology	1Kbit	400 kHz	4.6 µs	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Obsolete	ROHS3 Compliant
24LC01B-E/SN	Microchip Technology	1Kbit	400 kHz	4.6 µs	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active	ROHS3 Compliant
24AA01-I/SN	Microchip Technology	1Kbit	400 kHz	3500 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
24AA014-I/SN	Microchip Technology	1Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
24AA014H-I/SN	Microchip Technology	1Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
24AA01H-I/SN	Microchip Technology	1Kbit	400 kHz	900 ns	1.7V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
24LC014-E/SN	Microchip Technology	1Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active	ROHS3 Compliant
24LC014-I/SN	Microchip Technology	1Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
24LC014H-E/SN	Microchip Technology	1Kbit	1 MHz	400 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active	ROHS3 Compliant
24LC014H-I/SN	Microchip Technology	1Kbit	1 MHz	400 ns	2.5V ~ 5.5V	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
24LC01BH-E/SN	Microchip Technology	1Kbit	400 kHz	900 ns	2.5V ~ 5.5V	-40°C ~ 125°C	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: 24LC01B-E/SN is the direct functional equivalent with identical electrical specifications (400 kHz, 4.6 µs access time, 2.5V ~ 5.5V supply) and maintains the same operating temperature minimum of -40°C. This part is in active production status and RoHS3 compliant, providing the most straightforward replacement path with zero design modification required.

Extended Temperature Alternative: 24LC01BH-E/SN offers the same 400 kHz clock frequency and 2.5V ~ 5.5V supply range as the original part while providing faster access time (900 ns) and extended temperature range (-40°C ~ 125°C). This variant is suitable for applications requiring enhanced thermal performance.

Higher Performance Variants: 24LC014-I/SN and 24LC014H-I/SN provide faster access times (900 ns and 400 ns respectively) while maintaining the 2.5V ~ 5.5V supply range and -40°C ~ 85°C operating temperature. These parts are fully backward compatible at the I2C protocol level and pinout, making them suitable for designs where improved timing margins are beneficial.

Low Voltage Capable Alternatives: 24AA01-I/SN, 24AA014-I/SN, 24AA014H-I/SN, and 24AA01H-I/SN extend the minimum supply voltage to 1.7V, enabling operation in low-power applications. These parts maintain full I2C compatibility and 8-SOIC packaging but require verification that the 1.7V minimum does not conflict with system design constraints.

All recommended substitutes are RoHS3 compliant and in active production status, ensuring long-term component availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can 24LC01B-E/SN be used as a direct drop-in replacement for 24LC01B-I/SN?

A: Yes. Both parts share identical memory capacity (1Kbit), interface protocol (I2C 400 kHz), access time (4.6 µs), supply voltage range (2.5V ~ 5.5V), and 8-SOIC package. The primary difference is product status (active vs. obsolete) and extended temperature range on the -E/SN variant (-40°C ~ 125°C vs. -40°C ~ 85°C). No circuit modifications are required.

Q: What is the difference between 24LC014-I/SN and 24LC014H-I/SN?

A: Both parts operate at 400 kHz I2C clock frequency with 2.5V ~ 5.5V supply and -40°C ~ 85°C temperature range. The 24LC014H-I/SN variant provides faster access time (400 ns vs. 900 ns) and supports 1 MHz clock frequency operation, offering improved timing performance while maintaining full backward compatibility.

Q: Are 24AA01-I/SN and 24LC01B-I/SNG pin-compatible?

A: Yes. Both parts use 8-SOIC packaging with identical pinout. The 24AA01-I/SN extends the minimum supply voltage to 1.7V and provides 3500 ns access time. I2C protocol compatibility is maintained, allowing functional substitution in applications where the lower voltage minimum does not create design conflicts.

Q: Why do some substitute parts have lower minimum supply voltage (1.7V vs. 2.5V)?

A: The 24AA series (24AA01-I/SN, 24AA014-I/SN, 24AA014H-I/SN, 24AA01H-I/SN) is designed for low-power applications and supports operation down to 1.7V. The 24LC series maintains the 2.5V minimum. Both are fully functional in systems operating at 2.5V ~ 5.5V, but the 24AA variants offer additional flexibility for lower-voltage designs.

Q: Can faster access time variants (900 ns or 400 ns) replace the original 4.6 µs part?

A: Yes. Faster access times are backward compatible in I2C systems. The 24LC014-I/SN (900 ns) and 24LC014H-I/SN (400 ns) will operate correctly in any circuit designed for the 24LC01B-I/SNG (4.6 µs). No timing violations occur when substituting a faster part for a slower one.

Q: What is the significance of the temperature range suffix (-E vs. -I)?

A: The -E suffix indicates extended temperature range (-40°C ~ 125°C), while -I indicates standard range (-40°C ~ 85°C). Selection depends on application thermal requirements. Extended range variants are suitable for industrial or automotive environments with higher ambient temperatures.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance certification, matching the regulatory status of the original 24LC01B-I/SNG. All parts are also REACH unaffected and classified as EAR99 for export control purposes.

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