CAT24C01BWI Equivalent & Substitute Parts

Part Overview

The CAT24C01BWI is a 1Kbit EEPROM memory IC manufactured by onsemi, featuring I2C interface operation at 400 kHz with 8-SOIC surface mount packaging. This device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The part operates across a 1.8V to 6V supply range with -40°C to 85°C temperature specifications, serving applications requiring non-volatile serial memory with I2C protocol compatibility.

Key Parameters

Parameter	Value
Memory Size	1Kbit
Memory Organization	128 x 8
Memory Interface	I2C
Clock Frequency	400 kHz
Access Time	1 µs
Write Cycle Time	10ms
Voltage Supply Range	1.8V ~ 6V
Operating Temperature	-40°C ~ 85°C
Package Type	8-SOIC
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the CAT24C01BWI are evaluated based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Memory Interface: I2C protocol requirement
Operating Temperature Range: -40°C to 85°C minimum
Mounting Type: Surface mount configuration
Package Compatibility: Pin-compatible or functionally equivalent packaging

Secondary Consideration Parameters:

Memory Size and Organization
Clock Frequency capability
Supply Voltage overlap
Access Time and Write Cycle Time specifications

The identified substitutes maintain I2C interface compatibility and operate within the required temperature range. Package variations are noted where they differ from the original 8-SOIC specification.

Parameter Comparison

Parameter	CAT24C01BWI (Main)	N24C02UDTG	24AA014HT-I/SN
Manufacturer	onsemi	onsemi	Microchip Technology
Memory Size	1Kbit	2Kbit	1Kbit
Memory Organization	128 x 8	128 x 16	128 x 8
Memory Interface	I2C	I2C	I2C
Clock Frequency	400 kHz	1 MHz	400 kHz
Access Time	1 µs	450 ns	900 ns
Write Cycle Time	10ms	4ms	5ms
Voltage Supply Range	1.8V ~ 6V	1.6V ~ 5.5V	1.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package Type	8-SOIC	8-VFSOP	8-SOIC
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

24AA014HT-I/SN (Microchip Technology) provides the closest functional match to CAT24C01BWI. Both devices share identical memory capacity (1Kbit), organization (128 x 8), clock frequency (400 kHz), and package type (8-SOIC). The 24AA014HT-I/SN is currently in active production status with ROHS3 compliance certification, addressing the obsolescence of the original part. Supply voltage range compatibility spans the required operating window with minor upper-end variation (5.5V vs. 6V maximum). Access time specification (900 ns) and write cycle time (5ms) remain within acceptable operational parameters for I2C serial memory applications.

N24C02UDTG (onsemi) offers an alternative from the original manufacturer with enhanced performance characteristics. This device doubles memory capacity to 2Kbit with improved clock frequency (1 MHz) and faster access time (450 ns). However, package configuration differs (8-VFSOP vs. 8-SOIC), requiring PCB layout modification. The N24C02UDTG maintains active product status and ROHS3 compliance. Selection of this substitute is appropriate when increased memory capacity and performance headroom are design requirements and package transition is feasible.

Frequently Asked Questions (FAQ)

Q: Can the N24C02UDTG directly replace the CAT24C01BWI on existing PCBs?

A: No. While both are onsemi I2C EEPROM devices with compatible electrical specifications, the N24C02UDTG uses 8-VFSOP packaging versus the original 8-SOIC package. PCB footprint modification is required. The 24AA014HT-I/SN maintains identical 8-SOIC packaging and is suitable for direct board-level substitution.

Q: What is the primary advantage of selecting 24AA014HT-I/SN over N24C02UDTG?

A: The 24AA014HT-I/SN provides pin-for-pin and package-compatible replacement without PCB redesign. Both devices operate at 400 kHz I2C frequency with 1Kbit memory capacity. The Microchip part is currently in active production with established supply chain availability.

Q: Are there supply voltage compatibility concerns when substituting these parts?

A: All three devices operate within overlapping voltage ranges. The CAT24C01BWI specifies 1.8V to 6V, while both substitutes operate at 1.6V to 5.5V (N24C02UDTG) and 1.7V to 5.5V (24AA014HT-I/SN). Applications operating above 5.5V require retention of the original CAT24C01BWI or design modification.

Q: Does increased memory capacity in the N24C02UDTG affect I2C protocol compatibility?

A: I2C protocol compatibility is maintained. The N24C02UDTG doubles memory to 2Kbit with 128 x 16 organization versus 128 x 8 in the original. Address mapping and communication protocol remain I2C-standard. Firmware or software may require modification to utilize the additional memory capacity.

Q: What compliance certifications should be verified for new designs?

A: Both active substitutes (N24C02UDTG and 24AA014HT-I/SN) carry ROHS3 compliance certification. The original CAT24C01BWI compliance status is not specified in available documentation. For applications requiring specific regulatory compliance, the active parts provide documented certification.

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