24LC512T-I/ST - 512Kbit I2C EEPROM, 400kHz | Microchip
MPN： 24LC512T-I/ST ✓ 啟用中24LC512T-I/ST 概覽
A Serial EEPROM is a type of non-volatile memory (NVM) that retains stored data when power is removed and communicates serially over a few wires, in contrast to parallel memory which requires many more I/O lines. Within the memory hierarchy, the 24LC512 sits in the EEPROM sub-family of Memory ICs -> Non-volatile memory -> Semiconductor memory. It is typically chosen for small, frequently-updated parameter storage rather than bulk data, with 1 million erase/write cycles per page and >200-year data retention.
Key features include 128-byte page write buffer, hardware write-protect pin, cascadable up to 8 devices on a single I2C bus via the three address pins A0/A1/A2 (giving 8 unique 7-bit slave addresses), and an industry-standard 2-wire I2C interface compatible with most microcontrollers. The 'I' suffix denotes the industrial temperature grade of -40C to +85C, and the 'T' suffix denotes Tape & Reel packaging. The 24LC512 variant operates from 2.5V to 5.5V, the 24AA512 variant operates from 1.7V to 5.5V, and the 24FC512 variant runs to 1 MHz clock frequency.
Typical applications include storage of user-configurable settings, calibration constants, and event logs in industrial controllers, automotive infotainment, medical instrumentation, smart meters, IoT edge nodes, and consumer appliances. The TSSOP-8 footprint is pin-compatible with the 24C256 and most 24Cxx/24LCxx families, simplifying PCB migration from 32 Kbit or 64 Kbit legacy parts to 512 Kbit without layout changes.
When designing with this device, observe the I2C pull-up resistor selection (typically 2.2 kohm to 10 kohm depending on bus capacitance and clock speed), enable proper write-cycle timing (5 ms max page write), and connect the WP pin high to protect the upper 256 Kbit quadrant during mission-critical operation. Avoid cascaded bus topologies exceeding 400 pF total capacitance when running at 400 kHz.
直接替換替代品，適用於 24LC512T-I/ST — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： 24LC512T-I/ST （相同外形與佔位） — 差異在於 Memory Type, RoHS Status.
24LC512-I/ST
✅ 直接替換聯絡詢價
查看資料表 →24AA512T-I/ST
✅ 直接替換📋 參考替代品（不在目錄中）
24FC512T-I/ST
✅ 直接替換📋 參考替代品（不在目錄中）
24LC512T-I/SMG
✅ 直接替換📋 參考替代品（不在目錄中）
AT24C512C-SSHL-T
✅ 直接替換📋 參考替代品（不在目錄中）
CAT24C512HU5IGT3
✅ 直接替換📋 參考替代品（不在目錄中）
24LC512T-I/ST 規格
| 記憶體類型 | Non-Volatile EEPROM |
| Memory Format | EEPROM |
| 記憶體容量 | 512 Kbit (64K x 8) |
| Memory Interface | I2C (2-Wire Serial) |
| Clock Frequency (Max) | 400 kHz |
| Access Time | 900 ns |
| Write Cycle Time (Max) | 5 ms (page write) |
| Operating Voltage Range | 2.5 V to 5.5 V |
| 工作溫度範圍 | -40C to +85C (Industrial) |
| Page Write Buffer Size | 128 bytes |
| Endurance (Erase/Write Cycles) | 1,000,000 cycles per page (typical) |
| Data Retention | >200 years |
| 封裝 | 8-pin TSSOP (ST) |
| 安裝類型 | Surface Mount |
| Packaging | Tape & Reel |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
24LC512T-I/ST 腳位配置
| 腳位 1 | A0 — User-configurable slave address bit 0 (tie to VCC or GND) |
| 腳位 2 | A1 — User-configurable slave address bit 1 (tie to VCC or GND) |
| 腳位 3 | A2 — User-configurable slave address bit 2 (tie to VCC or GND) |
| 腳位 4 | GND — Ground reference |
| 腳位 5 | SDA — I2C serial data (open-drain, requires pull-up) |
| 腳位 6 | SCL — I2C serial clock (open-drain, requires pull-up) |
| 腳位 7 | WP — Write Protect (high = upper 256 Kbit read-only, low = full write access) |
| 腳位 8 | VCC — Power supply, 2.5 V to 5.5 V |
典型應用
24LC512T-I/ST 適用於 7 應用s: Industrial Controller Parameter Storage, Smart Meter Data Logging, Audio Equipment User Settings, IoT Edge Node Configuration Storage, Medical Device Calibration Memory, Automotive Infotainment Settings, Consumer Appliance Cycle Counters.
Industrial Controller Parameter Storage
The 24LC512T-I/ST is well-suited for industrial PLC and sensor module parameter storage because of its 512 Kbit (64K x 8) capacity, 2.5 V to 5.5 V supply, and 1 million write cycles per page endurance. Per Microchip datasheet 21754M, the device connects to a microcontroller I2C peripheral and stores calibration coefficients, setpoints, and event counters that survive power-cycle reset; the 5 ms page-write time and 900 ns read access fit deterministic industrial control loops.
推薦
Smart Meter Data Logging
The 24LC512T-I/ST supports smart electricity/water/gas meter data logging applications where hourly or daily consumption records must persist for years without power. Per Microchip datasheet 21754M, its >200-year data retention, -40C to +85C industrial temperature grade, and cascadable 8-device addressing (4 Mbit total) enable long-interval log retention without an external backup battery. The 128-byte page buffer speeds bulk logging writes.
推薦
Audio Equipment User Settings
The 24LC512T-I/ST serves as a non-volatile user preference store in pro-audio mixers, home theater receivers, and musical instrument equipment where last-used EQ presets, fader positions, and license keys must be retained across power cycles. Per Microchip datasheet 21754M, the 512 Kbit capacity fits hundreds of named preset slots, and the I2C interface allows low pin-count MCU connection; the WP pin protects factory calibration from user overwrite.
推薦
IoT Edge Node Configuration Storage
The 24LC512T-I/ST fits IoT edge node and wireless sensor designs as a low-power configuration store for Wi-Fi/BLE provisioning credentials, sensor calibration tables, and OTA update staging. Per Microchip datasheet 21754M, the 2.5 V to 5.5 V supply range aligns with battery and solar harvesters, and the TSSOP-8 footprint eases integration in compact modules; standby current is in the microamp range, making it negligible against MCU sleep budgets.
推薦
Medical Device Calibration Memory
The 24LC512T-I/ST is appropriate for medical instrumentation calibration memory in patient monitors, infusion pumps, and diagnostic analyzers where periodic calibration constants must remain tamper-evident. Per Microchip datasheet 21754M, the >200-year data retention and write-protect pin enable protected storage of factory calibration constants, while the 1 million cycle endurance supports frequent in-field recalibration without concern for premature wear-out.
推薦
Automotive Infotainment Settings
The 24LC512T-I/ST supports automotive infotainment and HVAC module user settings storage, including radio presets, seat/mirror positions, and climate preferences that must persist across battery disconnects. Per Microchip datasheet 21754M, the -40C to +85C industrial temperature grade handles cabin environments, and the 8-pin TSSOP enables compact PCB placement behind head units; pair with automotive-grade MCUs for full AEC-Q100 system compliance.
推薦
Consumer Appliance Cycle Counters
The 24LC512T-I/ST functions as a non-volatile cycle counter and run-hour log store in consumer appliances such as washing machines, dishwashers, and refrigerators where service life data must be retained. Per Microchip datasheet 21754M, the 512 Kbit capacity holds tens of thousands of timestamped events, and the I2C interface connects to any appliance-grade MCU; the WP pin protects warranty counters from user tampering.
推薦
推薦產品摘要
工程參考資料，適用於 24LC512T-I/ST — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 24LC512-I/ST | 24AA512T-I/ST | 24FC512T-I/ST | CAT24C512HU5IGT3 |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | onsemi |
| Package | TSSOP-8 (ST) | TSSOP-8 (ST) - same | TSSOP-8 (ST) - same | TSSOP-8 (ST) - same | TSSOP-8 (ST equivalent) - same |
| Memory Size | 512 Kbit (64K x 8) | 512 Kbit (64K x 8) - same | 512 Kbit (64K x 8) - same | 512 Kbit (64K x 8) - same | 512 Kbit (64K x 8) - same |
| Operating Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V - same | 1.7 V to 5.5 V - extended low voltage | 2.5 V to 5.5 V - same | 1.8 V to 5.5 V - extended low voltage |
| Max I2C Clock Frequency | 400 kHz | 400 kHz - same | 400 kHz - same | 1 MHz - 2.5x faster | 400 kHz - same |
| Page Write Buffer | 128 bytes | 128 bytes - same | 128 bytes - same | 128 bytes - same | 128 bytes - same |
| Packaging | Tape & Reel | Tube | Tape & Reel | Tape & Reel | Tape & Reel |
主要差異化特點
- Industrial temperature grade with 1M write cycles and >200-year retention (對比CAT24C512HU5IGT3 (onsemi))
- Cascadable up to 8 devices (4 Mbit total) via A0/A1/A2 address pins (對比24LC512-I/ST (tube version))
- Tape-and-reel packaging for automated SMT assembly (對比24LC512-I/ST (tube))
設計說明
Pull-up resistors on SDA and SCL are mandatory for the 24LC512T-I/ST because both lines are open-drain. Per Microchip datasheet 21754M, typical values are 2.2 kohm at 5 V with 400 pF total bus capacitance or 4.7 kohm to 10 kohm for lower-speed/lower-capacitance buses. Omitting the pull-ups is the single most common cause of bus-stuck-low or no-acknowledge faults at first prototype bring-up.
The 24LC512T-I/ST supports 400 kHz Fast Mode I2C, but total bus capacitance must stay below 400 pF including all device pins, traces, and connectors. Per Microchip datasheet 21754M, when cascading 8 devices on long cables, the cumulative capacitance can approach this limit; reduce pull-up resistor values or split the bus into segments with an I2C repeater to preserve rise-time margins.
Place the 24LC512T-I/ST as close as practical to the host MCU I2C pins to minimize bus capacitance and EMI susceptibility. Per Microchip datasheet 21754M, keep SDA/SCL traces short, parallel, and away from switching signals; add a 100 nF decoupling capacitor within 5 mm of the VCC pin for noise immunity, especially in motor-drive and switching-power applications.
合規資訊
RoHS compliant and lead-free per Microchip product page. Halogen-free per Microchip environmental compliance datasheet. Not AEC-Q100 qualified; for automotive designs requiring AEC-Q100, source the automotive-grade variant (24LC512T-I/ST16KVAO or equivalent) or use the part in non-safety-critical subsystems only.
