AT24C32C-PU EEPROM Memory IC Equivalent & Substitute Parts

Part Overview

The AT24C32C-PU is a 32Kbit EEPROM memory integrated circuit manufactured by Microchip Technology, featuring I2C serial interface communication at 1 MHz clock frequency. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement. The AT24C32C-PU operates across a wide supply voltage range of 1.8V to 5.5V and maintains compatibility with industrial temperature specifications from -40°C to 85°C. Through-hole 8-DIP packaging enables straightforward integration into legacy and new designs requiring non-volatile memory storage.

Substiute Parts

AT24C32C-PU

Microchip TechnologyIn Stock: 1336AT24C32C-PU Datasheet

Current PartRFQ

24AA32AF-I/P

Microchip TechnologyIn Stock: 186624AA32AF-I/P Datasheet

DirectRFQ

24AA32A-I/P

Microchip TechnologyIn Stock: 331624AA32A-I/P Datasheet

MFR RecommendedRFQ

BR24L32-W

Rohm SemiconductorIn Stock: 972BR24L32-W Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AT24C32C-PU is determined by strict alignment across the following critical parameters: memory capacity (32Kbit), memory organization (4K x 8), I2C interface protocol, package form factor (8-DIP through-hole), supply voltage compatibility, and operating temperature range. All qualified substitute parts maintain identical memory size, organization, and interface specifications. Clock frequency variations are acceptable when the substitute operates at equal or lower frequency than the original part, ensuring timing compatibility in I2C bus applications. Voltage supply ranges must encompass or exceed the original specification to guarantee operation across all intended supply conditions. Package and mounting type must remain unchanged to ensure mechanical and electrical compatibility with existing PCB designs.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—24AA32AF-I/P, 24AA32A-I/P, and BR24L32-W—satisfy the core substitution criteria for the obsolete AT24C32C-PU. The 24AA32A-I/P carries manufacturer verification status and maintains the identical voltage supply range (1.8V ~ 5.5V) as the original part, providing direct compatibility without additional circuit considerations. The 24AA32AF-I/P operates with a marginally lower minimum supply voltage (1.7V) and remains fully compatible across standard industrial applications. The BR24L32-W from Rohm Semiconductor provides an alternative source from a different manufacturer while maintaining all critical electrical and mechanical specifications. All substitute parts are currently in active production status, ensuring long-term availability and supply chain stability compared to the obsolete original part. ROHS3 compliance is maintained across all options, supporting environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the 24AA32AF-I/P, 24AA32A-I/P, or BR24L32-W directly replace the AT24C32C-PU without PCB modifications?

A: Yes. All substitute parts share identical package form factor (8-DIP), pin configuration, memory capacity (32Kbit), memory organization (4K x 8), I2C interface protocol, and operating temperature range (-40°C to 85°C). Direct pin-for-pin substitution is supported without PCB layout changes.

Q: What is the significance of the clock frequency difference between the AT24C32C-PU (1 MHz) and the substitute parts (400 kHz)?

A: The substitute parts operate at lower I2C clock frequencies. This is compatible with the original design because I2C bus timing is determined by the slowest device on the bus. Systems designed for 1 MHz operation will function correctly with 400 kHz devices; the bus will operate at the lower frequency. No timing violations occur in this direction.

Q: Are there voltage supply considerations when selecting between the substitute parts?

A: The 24AA32A-I/P and BR24L32-W both specify 1.8V minimum supply voltage, matching the original AT24C32C-PU. The 24AA32AF-I/P specifies 1.7V minimum, providing slightly broader low-voltage operation. All three support the full 5.5V maximum. Selection depends on the specific supply voltage range required by your application.

Q: Why is the 24AA32A-I/P recommended over the 24AA32AF-I/P?

A: The 24AA32A-I/P carries DiGi-Electronics Programmable verification status and maintains identical voltage specifications to the original part (1.8V ~ 5.5V). Both parts are functionally equivalent; the verification status provides additional confidence for critical applications.

Q: Is the BR24L32-W from Rohm Semiconductor a suitable alternative to the Microchip parts?

A: Yes. The BR24L32-W meets all substitution criteria: 32Kbit capacity, 4K x 8 organization, I2C interface, 8-DIP package, matching temperature range, and ROHS3 compliance. It provides supply chain diversification by sourcing from an alternative manufacturer while maintaining full electrical and mechanical compatibility.

Q: What is the impact of the 900 ns access time in substitute parts versus the 550 ns access time of the AT24C32C-PU?

A: The longer access time in substitute parts (900 ns) is acceptable because I2C protocol timing is controlled by clock frequency and bus timing parameters, not individual device access time specifications. The 400 kHz clock frequency of substitute parts inherently accommodates the longer access time. No system timing issues will occur.