AT24C02B-PU Microchip Integrated Circuit (Dual-In-Line Packages) In Stock
AT24C02B-PU is a 2 Kbit (256-byte) I2C serial EEPROM operating from 1.8 V to 5.5 V at up to 1 MHz I2C clock, with 1 million write/erase cycle endurance and 100-year data retention, housed in an 8-pin DIP package for prototyping and through-hole PCB assembly applications requiring non-volatile parameter storage.
- Manufacturer
- Microchip
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- AT24C02B-PU Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 2 Kbit (256-byte) EEPROM density organized as 32 pages of 8 bytes
- I2C interface supporting Standard (100 kHz), Fast (400 kHz), and FM+ (1 MHz) modes
- Wide supply range 1.8 V to 5.5 V for 3.3 V and 5 V system compatibility
- 1,000,000 write/erase cycle endurance for frequent parameter update applications
- 100-year minimum data retention at 25°C for long-life embedded configurations
- Hardware write-protect pin prevents accidental data overwrite
- 8-pin DIP package ideal for breadboard prototyping and through-hole production boards
Applications
AT24C02B-PU is used for storing small non-volatile configuration data such as calibration coefficients, device addresses, and user preferences in embedded systems including microcontroller development boards, sensor modules, and industrial instruments. The I2C interface with configurable address pins allows up to 8 AT24C02B devices to share a single 2-wire bus, making it practical for multi-node systems that store individual node configuration data. Through-hole hobbyist projects, Arduino add-on boards, and legacy industrial controllers that require replaceable EEPROM chips without soldering equipment also commonly use this device.
Specifications
| YTEOL | 0 |
| Clock Frequency-Max (fCLK) | 1MHz |
| Data Retention Time-Min | 100 |
| Endurance | 1000000 Write/Erase Cycles |
| I2C Control Byte | 1010DDDR |
| JESD-30 Code | R-PDIP-T8 |
| Memory Density | 2048bit |
| Memory IC Type | EEPROM |
| Memory Width | 8 |
| Number of Functions | 1 |
| Number of Words | 256words |
| Number of Words Code | 256 |
| Operating Mode | SYNCHRONOUS |
| Organization | 256X8 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP8,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Parallel/Serial | SERIAL |
| Programming Voltage | 5V |
| Serial Bus Type | I2C |
| Standby Current-Max | 0.000018A |
| Supply Current-Max | 0.003mA |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Write Cycle Time-Max (tWC) | 5ms |
| Write Protection | HARDWARE |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.32.00.51 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How many bytes can AT24C02B-PU store, and how is the memory organized internally?
AT24C02B-PU provides 2 Kbits (256 bytes) of EEPROM organized as 32 pages of 8 bytes each. A single page-write operation can program up to 8 bytes in one I2C transaction with a typical write cycle time of 5 ms, while a byte-write operation modifies a single byte and also completes within 5 ms.
How many devices can share a single I2C bus using AT24C02B-PU, and how is addressing configured?
AT24C02B-PU supports a 3-bit hardware address field on pins A0, A1, and A2, allowing up to 8 individual devices to coexist on the same 2-wire I2C bus. Each device is selected by its unique 7-bit I2C address formed by the fixed 1010 prefix and the 3 address pin states, enabling 8 x 256 bytes = 2 KB of total distributed EEPROM storage on one bus.
For an industrial sensor that is recalibrated frequently, how does AT24C02B-PU endurance hold up over a 10-year service life?
AT24C02B-PU is rated for 1,000,000 write/erase cycles per byte, which allows calibration updates at a rate of 273 writes per day for 10 years without exceeding the endurance limit. After the write cycles are exhausted, the data remains readable but becomes read-only, so the device continues to supply the last-written calibration values even past its write life.
At what minimum supply voltage can AT24C02B-PU operate, and what I2C speed is supported at that voltage?
AT24C02B-PU operates from a minimum of 1.8 V supply and supports I2C communication up to 400 kHz (Fast mode) at that voltage level. At 2.5 V and above, the device supports Fast-mode Plus (FM+) operation at 1 MHz, making it compatible with modern 1.8 V MCUs such as ARM Cortex-M0 devices in low-power IoT nodes.
Does AT24C02B-PU include write protection, and how is it activated?
Yes, AT24C02B-PU has a hardware write-protect (WP) pin that, when driven to VCC, prevents any write operation to the entire 256-byte array while still allowing read access. Tying WP low enables normal read/write operation. This pin is useful in safety-critical designs where calibration or configuration data must be locked against accidental overwrite after final factory programming.
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