AT24C32 Microchip Integrated Circuit (Dual-In-Line Packages) In Stock
The Microchip AT24C32 is a 32 Kbit (4 KB) I2C serial EEPROM with a 400 kHz fast-mode interface and 1.8 V to 5.5 V wide supply range. It offers 32-byte page write and a 1,000,000-cycle endurance rating with 100-year data retention. Available in DIP-8, SOIC-8, and TSSOP-8 packages with worldwide stock and fast shipping.
- Manufacturer
- Microchip
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- AT24C32 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 32 Kbit (4 KB) capacity with 32-byte page write buffer enabling fast sequential data storage in 5 ms write cycle
- Wide 1.8 V to 5.5 V supply range compatible with 3.3 V and 5 V MCU systems without level shifters
- 400 kHz fast-mode I2C interface with hardware address pins allowing up to 8 devices on a single bus
- 1,000,000 write/erase cycle endurance and 100-year data retention for reliable non-volatile parameter storage
Applications
The AT24C32 is widely used to store calibration coefficients, device configuration parameters, and real-time clock module backup data in embedded systems ranging from Arduino shields to industrial sensor nodes. It is a staple in consumer electronics such as smart meters, medical monitoring devices, and set-top boxes that need low-cost non-volatile memory for user preference and event logging. Its 8-device bus sharing via hardware address pins also makes it ideal for multi-node network equipment storing individual node identities and firmware version tables on a shared I2C backplane.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How much data can the AT24C32 store, and how quickly can it complete a sequential page write?
The AT24C32 provides 32 Kbits (4,096 bytes) of non-volatile EEPROM storage organized in 128 pages of 32 bytes each. A full 32-byte page write completes in a maximum 5 ms write cycle time, after which the device returns an ACK on the I2C bus to signal completion. This throughput is sufficient for storing MCU firmware configuration blocks, sensor offset tables, and event log entries at rates compatible with most embedded real-time operating schedules.
What voltage range does the AT24C32 support, and can it interface directly with 3.3 V microcontrollers?
The AT24C32 operates from 1.8 V to 5.5 V, making it directly compatible with 3.3 V ARM Cortex-M MCUs and 5 V AVR or PIC microcontrollers without requiring level-shifting circuitry. At 3.3 V supply, the I2C lines operate with standard 400 kHz fast-mode timing. This broad voltage tolerance also allows the part to function in battery-backed RTC modules where supply voltage may drop to 1.8 V as the backup cell discharges.
How many AT24C32 devices can share the same I2C bus, and how is each device addressed?
Up to 8 AT24C32 devices can share a single I2C bus simultaneously using the three hardware address pins A0, A1, and A2, which define the lower 3 bits of the 7-bit device address (base 0x50 to 0x57). This is particularly useful in data-logger boards that need more than 4 KB of EEPROM: 8 devices provide 32 KB total at a cost of only 3 GPIO lines for address configuration. All 8 devices respond independently to their unique addresses without additional arbitration logic.
What is the write endurance of the AT24C32, and how long can stored data survive without power?
The AT24C32 is specified for a minimum of 1,000,000 erase/write cycles per memory cell, far exceeding the typical 100,000-cycle limit of many lower-cost EEPROMs. Data retention is guaranteed for 100 years at 25°C after the last write, making it suitable for product lifetime logging in appliances and industrial sensors deployed for 10 to 20 years. Even at elevated temperatures of 85°C, manufacturers typically guarantee 10 years of data retention without refresh.
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