24LC512-I/ST - 512Kb I2C EEPROM 8-TSSOP | Microchip
部品番号: 24LC512-I/ST ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $2.31 | $2.31 |
| 10 | $2.05 | $20.50 |
| 100 | $1.78 | $178.00 |
| 500 | $1.55 | $775.00 |
| 1,000 | $1.34 | $1,340.00 |
24LC512-I/ST 概要
A Serial EEPROM is a type of non-volatile memory that retains data without a battery and is accessed through a simple two-wire serial protocol. The 24LC512 belongs to the broader EEPROM family, which sits alongside flash and FRAM in the non-volatile memory hierarchy. It is intended for systems that need frequent byte-level rewrites with endurance far higher than flash, typically 1 million erase/write cycles per page and over 200 years of data retention.
Key features of the 24LC512-I/ST include a 128-byte page write buffer, hardware write-protect pin (WP), cascadability for up to eight devices on a single I2C bus via the A0/A1/A2 address pins, and typical standby current of only 1 uA with active read current of approximately 1 mA at 5.5V. The internal organization is 512 pages of 128 bytes each, accessed by a 16-bit address pointer transmitted by the master.
The device uses Microchip's proprietary CMOS EEPROM process with a self-timed erase/write cycle, freeing the host MCU to perform other tasks while a write completes. Built-in error-correction and hardware data protection guard against partial writes during power-down, which is important for industrial and consumer systems that may lose power mid-write.
Typical applications include industrial data loggers, automotive accessory modules, consumer-electronics parameter storage, black-box and metering recorders, embedded system configuration EEPROM, and I/O expansion when paired with an MCU that has limited internal non-volatile memory. The wide VCC range and industrial -40C to +85C operating temperature make it a versatile drop-in for factory, automotive and battery-powered systems.
When designing with the 24LC512-I/ST, ensure the I2C pull-up resistors are sized for the bus capacitance and the target clock rate (typically 2.2-10 kohm at 400 kHz). Place a 0.1 uF decoupling capacitor close to VCC, and observe the mandatory 5 ms write-cycle time between successive page writes to avoid status-poll overhead.
This page synthesizes distributor pricing, drop-in alternatives, and practical I2C EEPROM design notes that are not consolidated in any single manufacturer datasheet, giving you a one-stop engineering reference.
ドロップイン代替品: 24LC512-I/ST — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: 24LC512-I/ST （同一形状・フットプリント） — 相違点: Memory Type, RoHS Status.
クイック比較ツール — 並列比較する代替部品を選択:
24AA512-I/ST
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
24FC512-I/ST
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
24LC512T-I/ST
✅ ドロップイン✓ 在庫あり
$1.45 / 個
データシートを見る →24LC512-E/ST
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
24LC512T-I/SN
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
AT24C512C-SSHL-T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
24LC512-I/ST 最大定格＆電気的特性
| メモリタイプ | EEPROM (Electrically Erasable PROM) |
| メモリサイズ | 512 Kbit (64K x 8) |
| メモリ構成 | 64K x 8 bits |
| インターフェース | I2C (2-wire Serial) |
| Supply Voltage (VCC) | 2.5 V to 5.5 V |
| Max Clock Frequency | 400 kHz |
| Access Time | 900 ns |
| Page Write Buffer | 128 bytes |
| Number of Pages | 512 pages of 128 bytes |
| Address Pins (A0/A1/A2) | Yes (3 pins, supports up to 8 devices on bus) |
| Write-Protect Pin (WP) | Yes (hardware WP) |
| Standby Current | 1 uA (typical) |
| Active Read Current | 1 mA (typical at 5.5V, 400 kHz) |
| Write Cycle Time | 5 ms (max) |
| Endurance | 1,000,000 erase/write cycles per page (typical) |
| Data Retention | >200 years |
| 動作温度 | -40 C to +85 C (industrial grade, 'I') |
| パッケージ | 8-pin TSSOP (ST) |
| 実装タイプ | Surface Mount |
| MSLレベル | 1 (unlimited floor life at <30 C / 85% RH) |
| RoHS ステータス | Compliant (Pb-free) |
| Lead-Free | Yes |
24LC512-I/ST ピン構成
| ピン 1 | A0 — I2C slave address bit 0 (LSB); tie to VCC or GND to set address |
| ピン 2 | A1 — I2C slave address bit 1; supports up to 8 cascaded devices |
| ピン 3 | A2 — I2C slave address bit 2 (MSB of hardware address) |
| ピン 4 | VSS — Ground reference |
| ピン 5 | SDA — I2C serial data (open-drain; requires external pull-up) |
| ピン 6 | SCL — I2C serial clock input (requires external pull-up) |
| ピン 7 | WP — Write-protect input (active-high; ties to VCC to inhibit writes) |
| ピン 8 | VCC — Supply voltage (2.5 V to 5.5 V); decouple with 0.1 uF to VSS |
主な用途
24LC512-I/ST の用途: 6 件s: Industrial Data Logging, Consumer Electronics Parameter Storage, Automotive Accessory Modules, Embedded System Configuration EEPROM, Metering and Black-Box Recorders, I/O Expansion via Memory-Mapped EEPROM.
Industrial Data Logging
The 24LC512-I/ST's 512 Kbit capacity and 128-byte page-write buffer make it ideal for industrial data loggers capturing sensor readings, calibration constants and event timestamps over long deployment windows. Its 1 million write-cycle endurance per page far exceeds typical flash, allowing frequent parameter updates without wearing out the array, while the 2.5-5.5V supply tolerates noisy factory-rail brownouts. The -40C to +85C industrial rating handles unheated enclosures, and the >200-year data retention ensures log integrity for years-long archives.
おすすめ
Consumer Electronics Parameter Storage
The 24LC512-I/ST stores user preferences, factory calibration, MAC addresses and firmware revision codes in appliances, audio gear and small appliances. Its 1 uA standby current is negligible against battery drain, and the 8-pin TSSOP footprint fits inside compact plastic enclosures. The I2C interface pairs cleanly with any 3.3V or 5V MCU, while the optional hardware write-protect pin guards bootloader parameters from accidental overwrites during field updates.
おすすめ
Automotive Accessory Modules
Aftermarket automotive accessories - alarm modules, GPS trackers, dashcam configuration memories - use the 24LC512-I/ST to log state, store installer parameters and remember trip data across battery disconnects. The wide 2.5-5.5V supply tolerates cranking transients on a 12V automotive rail when paired with a simple LDO, and the -40C to +85C rating covers cabin and trunk installations. Up to 8 cascaded devices let multi-channel trackers share one I2C bus without address collisions.
おすすめ
Embedded System Configuration EEPROM
Embedded Linux boards, industrial controllers and IoT gateways often need >16 KB of persistent storage for kernel arguments, device-tree overlays, network credentials and application logs - the 24LC512-I/ST fills that niche without the cost of a larger flash. Its simple byte-addressable I2C interface avoids complex flash translation layers, and the 5 ms write cycle is fast enough for boot-time config load. The 128-byte page buffer optimizes sequential writes of large config blobs.
おすすめ
Metering and Black-Box Recorders
Energy meters, flow meters and tamper-evident black-box recorders rely on the 24LC512-I/ST's non-volatile storage with >200-year retention to preserve billing history and tamper logs even when the meter's primary battery is removed. The 512 Kbit capacity stores thousands of timestamped events, while the hardware write-protect pin enables legal hold - once asserted, no software write can erase critical evidence. Its small TSSOP-8 package fits inside revenue-grade meter enclosures.
おすすめ
I/O Expansion via Memory-Mapped EEPROM
Small 8-bit MCUs with limited GPIO can use the 24LC512-I/ST as a low-cost I/O expander by mapping discrete output states into byte locations and toggling them through I2C writes. Each byte is independently readable, so input emulation via latched sensors is also straightforward. The TSSOP-8 footprint fits on virtually any daughter board, and the cascading A0/A1/A2 address pins let one MCU drive up to 4 Mbit of storage from only 2 I/O lines.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: 24LC512-I/ST — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | 24AA512-I/ST | 24FC512-I/ST | 24LC512T-I/ST | 24LC512-E/ST | AT24C512C-SSHL-T |
|---|---|---|---|---|---|---|
| Package | TSSOP-8 (ST) | TSSOP-8 - same | TSSOP-8 - same | TSSOP-8 - same | TSSOP-8 - same | TSSOP-8 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology (formerly Atmel) |
| Memory Size | 512 Kbit (64K x 8) | 512 Kbit | 512 Kbit | 512 Kbit | 512 Kbit | 512 Kbit |
| Supply Voltage (VCC) | 2.5 V to 5.5 V | 1.7 V to 5.5 V (wider) | 2.5 V to 5.5 V (same) | 2.5 V to 5.5 V (same) | 2.5 V to 5.5 V (same) | 1.8 V to 5.5 V (wider) |
| Max I2C Clock | 400 kHz | 400 kHz (same) | 1 MHz (faster, +150%) | 400 kHz (same) | 400 kHz (same) | 400 kHz to 1 MHz (variant-dependent) |
| Operating Temperature | -40 C to +85 C (industrial 'I') | -40 C to +85 C (same) | -40 C to +85 C (same) | -40 C to +85 C (same) | -40 C to +125 C (wider, +40C) | -40 C to +85 C (same) |
| Write Endurance | 1,000,000 cycles/page | 1,000,000 cycles/page | 1,000,000 cycles/page | 1,000,000 cycles/page | 1,000,000 cycles/page | 1,000,000 cycles/page |
| Data Retention | >200 years | >200 years | >200 years | >200 years | >200 years | >40 years (lower) |
主な差別化要因
- Industrial temperature grade standard in -I/ST suffix （vs 24LC512-E/ST)
- 400 kHz standard vs 1 MHz I2C variants available in same footprint （vs 24FC512-I/ST)
- Tape-and-reel orientation variant available without silicon change （vs 24LC512T-I/ST)
設計ノート
Place a 0.1 uF decoupling capacitor as close as possible to the VCC pin (pin 8) with a short, wide trace to the VSS pin (pin 4). For noisy industrial rails, add a bulk 1-10 uF tantalum or ceramic capacitor adjacent to the device. The TSSOP-8 thermal pad (if present on your variant) should be soldered to a ground pour to improve thermal and electrical performance under continuous write cycles.
I2C SDA and SCL are open-drain outputs - never drive them push-pull. Size pull-up resistors between 1 kohm and 10 kohm to balance rise time against bus capacitance; at 400 kHz with a 5 V supply and ~100 pF total bus capacitance, 2.2 kohm is a typical starting point. For buses longer than 10 cm or with multiple slaves, verify rise time < 300 ns with an oscilloscope. Add 4.7 kohm pull-ups on WP if you need a defined default-inactive state.
Always observe the 5 ms write-cycle time between page writes to avoid status-poll contention. Polling ACK polling (write address + read) is faster than fixed 5 ms delays for most applications. Never tie WP high during a multi-byte boot configuration load - WP must be low (VSS) for the entire sequence or writes will silently fail. A0/A1/A2 pins have no internal pull-ups - tie them explicitly to VCC or VSS, never leave them floating.
Estimated: during a page write the device draws approximately 3 mA peak from VCC for up to 5 ms. For battery-powered designs using a coin cell, gate the EEPROM's VCC through an MCU-controlled load switch to eliminate standby current when not actively writing. Active read current of 1 mA at 400 kHz is significant for continuous streaming - use page-mode reads of up to 128 bytes before issuing a STOP.
コンプライアンス情報
RoHS compliant per Microchip product page and TSSOP-8 'ST' suffix denotes lead-free / Pb-free finish. The 24LC512 family is not AEC-Q100 qualified - for AEC-Q100 automotive applications use a Q100-screened variant such as the 24LC512-I/SN automotive-grade equivalent (consult Microchip for the specific Q100 part number). Halogen-free per Microchip green-compound declaration.
