24AA02E48-I/OT - 2Kb I2C EEPROM with EUI-48 MAC | Microchip
MPN: 24AA02E48-I/OT ✓ Hoạt động24AA02E48-I/OT Tóm tắt
An EEPROM (Electrically Erasable Programmable Read-Only Memory) is a non-volatile memory that retains data without power and supports byte-level, in-circuit rewrites through a serial protocol. The 24AA02E48 belongs to the I2C EEPROM family -> serial EEPROM -> non-volatile memory -> memory IC -> semiconductor. It is a system-configuration memory used to store small amounts of critical data such as MAC addresses, calibration coefficients, and node identity that must survive power cycles.
Key features of the 24AA02E48-I/OT include the pre-programmed, read-only EUI-48 node identity (the globally unique 6-byte IEEE MAC address stored in the upper 128-byte block), a fixed I2C slave address (no A0/A1/A2 pins on the SOT-23 package), and page-write capability of up to 8 bytes per write cycle. The wide 1.7 V minimum supply enables direct interface to coin-cell-powered MCUs and 1.8 V SoCs without level shifting.
Architecturally, the 24AA02E48 uses Microchip's CMOS floating-gate cell array with an integrated I2C slave controller. The slave address is hard-wired (1010bxxx) with the three LSBs fixed for the SOT-23 version, and writes are protected by a software write-enable latch. ESD performance is rated at 4 kV HBM and 2 kV CDM, and the device is qualified to 1,000,000 erase/write cycles per page with greater than 200-year data retention.
Typical applications include storing the EUI-48 MAC address in Ethernet nodes, Zigbee/Thread/BLE radio modules, industrial sensor nodes, and any connected device that requires a unique IEEE 802 identity without an external EEPROM. It is also used for storing board configuration, manufacturing calibration data, and tamper-evident security keys.
When designing with the 24AA02E48-I/OT, ensure pull-up resistors on SCL and SDA (typically 4.7 kohm for 5 V and 10 kohm for 1.8 V) and respect the 30 ms maximum write cycle time. Because the upper memory block holds the pre-programmed EUI-48, do not write to addresses 0x80-0xFF unless your firmware intentionally overwrites the MAC (some host designs store a custom MAC in the lower block instead).
This page synthesizes distributor pricing, drop-in alternatives, and design notes not found in the manufacturer datasheet to accelerate EUI-48 node-identity integration.
Bộ thay thế dễ dàng lắp đặt cho 24AA02E48-I/OT — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với 24AA02E48-I/OT (cùng hình factor và footprint) — khác nhau ở Memory Type, Package, Memory Organization, Memory Size, Data Retention.
24AA02E48T-I/OT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →24AA02E48-I/OTG
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
24AA02E48T-I/OTG
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
24AA02E64T-I/OT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
24AA02E48-I/OT Tỷ lệ tối đa & tính chất điện
| Kiểu bộ nhớ | EEPROM - Serial (I2C) |
| Kích thước bộ nhớ | 2 Kbit (256 x 8) |
| Memory Organization | 2 blocks of 128 x 8-bit |
| Loại giao diện | I2C (2-wire serial) |
| Clock Frequency (Max) | 400 kHz |
| Access Time (Max) | 900 ns |
| Supply Voltage (Min) | 1.7 V |
| Supply Voltage (Max) | 5.5 V |
| Active Read Current (Max) | 1 mA |
| Standby Current (Max) | 1 uA |
| Page Write Size | 8 bytes |
| Write Cycle Time (Max) | 5 ms |
| Endurance | 1,000,000 erase/write cycles per page |
| Data Retention | greater than 200 years |
| Pre-programmed Identity | EUI-48 MAC address (in upper block, 0x80-0xFF) |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial / I grade) |
| Hộp | SOT-23-5 (OT) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân 24AA02E48-I/OT
| Chân 1 | SDA — Serial data input/output (I2C bidirectional) |
| Chân 2 | GND — Ground reference |
| Chân 3 | NC — No internal connection on SOT-23-5 variant |
| Chân 4 | WP — Write-protect input; tie to VCC for full read/write, to GND to protect upper block |
| Chân 5 | SCL — Serial clock input (I2C) |
Ứng dụng tiêu biểu
24AA02E48-I/OT phù hợp cho 6 Áp dụngs: EUI-48 MAC Address Storage for Ethernet Nodes, Zigbee / Thread / Matter Radio Module Identity, Industrial Sensor Node Configuration Memory, Wi-Fi Module EUI-48 Backup Identity, Battery-Backed Medical and Wearable Device Identity, Automotive Aftermarket Diagnostic Dongle.
EUI-48 MAC Address Storage for Ethernet Nodes
The 24AA02E48-I/OT is purpose-built to provide a globally unique EUI-48 MAC address to IEEE 802.3 Ethernet controllers, Wi-Fi modules, and Bluetooth Classic radios that lack an internal identity. Its pre-programmed upper 128-byte block contains a factory-locked EUI-48 that the host firmware reads over I2C, eliminating the need for per-board programming stations and avoiding the risk of duplicate MACs in the field. The 1.7-5.5 V supply matches typical 1.8 V SoC rails directly, and the 1 uA standby draws negligible current from always-on power domains.
Được đề xuất
Zigbee / Thread / Matter Radio Module Identity
Zigbee 3.0, Thread, and Matter radio modules based on Silicon Labs EFR32 or Nordic nRF52840 often require an external EUI-64 (or EUI-48 translated to EUI-64) node identity to bootstrap the mesh network. The 24AA02E48-I/OT supplies this identity through its upper memory block over a 400 kHz I2C bus that the radio SoC drives directly. The 1 uA standby current keeps the device compatible with battery-backed IoT nodes that spend years in sleep, and the SOT-23-5 footprint fits beneath the radio shield.
Được đề xuất
Industrial Sensor Node Configuration Memory
Industrial 4-20 mA transmitters, Modbus RTU slaves, and CANopen I/O modules often need 256 bytes of non-volatile storage for calibration coefficients, sensor linearization tables, and Modbus node address. The 24AA02E48-I/OT stores this data plus its pre-programmed identity in a single 5-pin SOT-23, simplifying the BOM versus a separate generic EEPROM plus MAC chip. The -40 C to +85 C industrial temperature range covers most outdoor and factory-floor deployments, and the greater than 200-year retention guarantees the calibration survives decades of storage.
Được đề xuất
Wi-Fi Module EUI-48 Backup Identity
Many ESP32 and RTL8710 Wi-Fi modules ship with a factory-default MAC that the host may overwrite; the 24AA02E48-I/OT provides a backup or primary EUI-48 identity that survives firmware reflash and module replacement. Placed on the carrier PCB between the 3.3 V rail and the module's I2C pins with 4.7 kohm pull-ups, the EEPROM responds at slave address 0x50 and the upper block delivers the unique MAC in 6 sequential byte reads. The 1 mA active current is well within the Wi-Fi module's I2C bus drive capability.
Được đề xuất
Battery-Backed Medical and Wearable Device Identity
Wearable medical devices, hearing aids, and patient monitors often operate for years on a coin cell and must transmit a stable unique device identifier (UDI) for FDA and EU MDR compliance. The 24AA02E48-I/OT's 1 uA maximum standby current adds less than 0.1 % to the annual battery budget of a CR2032, and its pre-programmed EUI-48 provides the EUDAMED-compatible UDI without factory programming. The 1.7 V minimum supply lets the EEPROM stay accessible down to the brown-out threshold of most 1.8 V SoCs.
Được đề xuất
Automotive Aftermarket Diagnostic Dongle
OBD-II Bluetooth and CAN diagnostic dongles require a unique identity so that the paired phone app or cloud service can recognize the same physical device across re-pairings. The 24AA02E48-I/OT serves that role with its EUI-48 pre-programmed address, eliminating the need for per-unit programming during dongle assembly. While not AEC-Q100 qualified (Microchip offers automotive-grade siblings with /VAO suffixes), it is widely used in non-safety automotive aftermarket applications at -40 C to +85 C.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho 24AA02E48-I/OT — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 24AA02E48T-I/OT | 24AA02E48-I/OTG | 24AA02E48T-I/OTG | 24AA02E64T-I/OT |
|---|---|---|---|---|---|
| Package | SOT-23-5 (OT) | SOT-23-5 (OT) - same | SOT-23-5 (OT) - same | SOT-23-5 (OT) - same | SOT-23-5 (OT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Memory Size | 2 Kbit (256 x 8) | 2 Kbit (256 x 8) | 2 Kbit (256 x 8) | 2 Kbit (256 x 8) | 2 Kbit (256 x 8) |
| Pre-programmed Identity | EUI-48 (6-byte) | EUI-48 (6-byte) | EUI-48 (6-byte) | EUI-48 (6-byte) | EUI-64 (8-byte) |
| Operating Voltage Range | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 1.7 V to 5.5 V | 1.7 V to 5.5 V |
| Max Clock Frequency | 400 kHz | 400 kHz | 400 kHz | 400 kHz | 400 kHz |
| Page Write Size | 8 bytes | 8 bytes | 8 bytes | 8 bytes | 8 bytes |
| Operating Temperature Range | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Bảo phân biệt quan trọng
- Pre-programmed EUI-48 MAC address eliminates factory programming step (vsGeneric AT24C02 2-Kbit I2C EEPROM)
- Drop-in SOT-23-5 footprint across all 24AA02E48 variants (vs24AA025E48 (SOT-23-6 with A0/A1 chip-select pins))
- Wide 1.7 V minimum supply enables direct 1.8 V SoC connection (vsOlder 24LC02 (2.5 V minimum))
Ghi chú thiết kế
The 24AA02E48-I/OT draws a maximum of 1 uA in standby and 1 mA during active read at 400 kHz. At 3.3 V supply this is negligible compared to typical MCU sleep currents. However, during the 5 ms internal write cycle the device draws its active supply - decouple VCC with a 100 nF X7R ceramic placed within 3 mm of the VCC pin to prevent supply droop from injecting noise into the I2C bus during write completion.
Use 4.7 kohm I2C pull-up resistors to VCC for 5 V operation and 10 kohm for 1.8 V operation. Place pull-ups close to the MCU side of the bus to balance rise time against bus capacitance - the SOT-23-5 footprint adds minimal capacitance (~2 pF) so the bus is typically limited by the MCU pin and PCB trace. Keep SDA and SCL traces short and parallel, with a ground guard on long runs to limit radiated emissions.
The upper 128-byte block (addresses 0x80-0xFF) of the 24AA02E48 contains the factory-locked EUI-48 MAC address. Do not perform page writes that straddle the 0x7F/0x80 boundary - the I2C page write command will silently roll over within the page. To read the EUI-48, perform sequential byte reads starting at address 0xFA (last 6 bytes) without sending a stop bit between bytes. Tie WP (pin 4) to VCC to allow writes to the lower block for user data, or to GND to hardware-protect the entire memory if the MAC must be immutable.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - choose /VAO-suffixed automotive variants for AEC-Q100. Halogen-free green package available with G suffix (24AA02E48-I/OTG).
