25LC512-I/SN - 512Kb SPI EEPROM, 20MHz, 8-SOIC | Microchip
部品番号: 25LC512-I/SN ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $2.15 | $2.15 |
| 10 | $1.94 | $19.40 |
| 100 | $1.72 | $172.00 |
| 500 | $1.53 | $765.00 |
| 1,000 | $1.36 | $1,360.00 |
25LC512-I/SN 概要
An EEPROM (Electrically Erasable Programmable Read-Only Memory) is a non-volatile memory that retains data when power is removed and supports individual byte-level in-system rewrite without first erasing an entire block. EEPROMs sit between true ROM and Flash in the non-volatile memory hierarchy: unlike Flash, they do not require a sector erase before byte write, and unlike ROM, they are reprogrammable in-circuit. They are commonly used for device configuration, calibration constants, user preference storage, and small data-logging buffers where byte-level updates dominate the workload.
The 25LC512 distinguishes itself with a 20 MHz maximum clock rate, low active current (~5 mA typical at 5 V, 20 MHz), and a deep power-down mode that drops standby current below ~1 µA. The SOIC-8 package, low pin count, and industry-standard SPI command set make it a straightforward drop-in for any system with a microcontroller or SBC that exposes an SPI master. Page, sector (4-Kbyte), and chip erase commands extend its feature set beyond plain EEPROM toward light Flash-style use.
Typical applications include storing user settings, calibration coefficients, and black-box event logs in industrial controllers, home appliances, automotive accessory modules, medical instrumentation, and consumer electronics. The wide VCC range (2.5–5.5 V) lets the same part ride on 3.3 V or 5 V rails without level translation. Combined with the SPI bus, designers can chain multiple 25-series EEPROMs by giving each a unique CS line on the same shared SCK/SI/SO bus.
When designing with this part, observe the page-write timing: a status register poll is required before the next write, since writes are non-blocking on the SPI command interface. Hold the CS pin low for the entire SPI transaction and respect tWC (max 5 ms page write cycle) before issuing the next command. Decouple VCC with a 0.1 µF ceramic capacitor placed within a few millimetres of the supply pin.
This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes that are not consolidated in any single manufacturer datasheet, helping engineers select and qualify the 25LC512-I/SN quickly for new designs and existing BOMs.
ドロップイン代替品: 25LC512-I/SN — 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: 25LC512-I/SN （同一形状・フットプリント） — 相違点: Data Retention, Interface, Memory Type, Memory Size, Page Size.
クイック比較ツール — 並列比較する代替部品を選択:
25LC512-E/SN
✅ ドロップイン✓ 在庫あり
$0.86 / 個
データシートを見る →25LC512T-I/SN
✅ ドロップイン📋 参考代替品（カタログ未掲載）
25AA512-I/SN
✅ ドロップイン📋 参考代替品（カタログ未掲載）
25LC256-I/SN
✅ ドロップイン📋 参考代替品（カタログ未掲載）
25LC512-I/SN 最大定格＆電気的特性
| メモリタイプ | Non-Volatile EEPROM (Serial) |
| メモリサイズ | 512 Kbit (64 Kbyte) |
| Memory Organization | 64K × 8 |
| インターフェース | SPI (Mode 0 and Mode 3 compatible) |
| 最大クロック周波数 | 20 MHz |
| Supply Voltage (VCC) | 2.5 V to 5.5 V |
| Page Size | 128 byte |
| Write Cycle Time (tWC) | 5 ms (max) |
| Data Retention | 200 years |
| Endurance | 1,000,000 erase/write cycles per page |
| 動作温度 | -40 °C to +85 °C (Industrial, 'I' grade) |
| パッケージ | 8-pin SOIC (SN) 3.9 mm body width |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant (Pb-free) |
25LC512-I/SN ピン構成
| ピン 1 | CS — Chip Select (active low) |
| ピン 2 | SO — Serial Data Out (MISO) |
| ピン 3 | WP — Write-Protect (active low, tied to VCC if unused) |
| ピン 4 | VSS — Ground |
| ピン 5 | SI — Serial Data In (MOSI) |
| ピン 6 | SCK — Serial Clock Input |
| ピン 7 | HOLD — Hold (active low, tied to VCC if unused) |
| ピン 8 | VCC — Power Supply (2.5 V to 5.5 V) |
主な用途
25LC512-I/SN の用途: 7 件s: Industrial Control Parameter Storage, Home Appliance User Settings, Automotive Accessory Modules, Medical Device Calibration and Logs, Consumer Audio Equipment, IoT and Smart Home Sensor Nodes, Test and Measurement Datalogging.
Industrial Control Parameter Storage
The 25LC512-I/SN is well suited to industrial PLC, sensor and motor-drive parameter storage. Its 512 Kbit density accommodates large calibration tables and configuration blocks, while the 2.5–5.5 V supply rides directly on 3.3 V or 5 V rails derived from industrial 24 V buses. The SPI bus at 20 MHz lets the host MCU update settings in microseconds, and 1 million write cycles per page plus 200-year retention ensure decades of reliable field operation across the industrial -40 °C to +85 °C range.
おすすめ
Home Appliance User Settings
White goods and small kitchen appliances benefit from the 25LC512-I/SN's non-volatile byte-writable storage. The 64 Kbyte array holds user preferences, cycle counters and fault logs that survive power cycles without battery backup. SPI at 20 MHz keeps update latency low, and the 8-SOIC package fits tight enclosures. Designers can daisy-chain the chip on a shared SPI bus with a separate CS line, simplifying board layout and BOM cost.
おすすめ
Automotive Accessory Modules
Aftermarket automotive modules (dash cameras, GPS loggers, audio accessories) leverage the 25LC512-I/SN to store trip data, EQ curves and device IDs across battery-disconnect events. The wide 2.5–5.5 V supply tolerates 12 V-derived rails regulated down to 5 V or 3.3 V. The 128-byte page write keeps firmware simple, and the SPI bus is straightforward to bit-bang if the host MCU lacks a hardware controller. The I grade covers cabin temperatures up to +85 °C reliably.
おすすめ
Medical Device Calibration and Logs
Portable medical instrumentation (blood-pressure cuffs, glucose meters, pulse oximeters) relies on the 25LC512-I/SN for per-unit calibration constants and patient-log retention. Its byte-write capability avoids the sector-erase complexity of Flash, simplifying FDA/IEC 62304-style firmware, while 200-year data retention preserves records for the life of the device. The SPI interface keeps the bill of materials minimal and the 8-SOIC footprint is easy to source across geographies.
おすすめ
Consumer Audio Equipment
Audio equipment including headphone amplifiers, mixing consoles and instrument tuners uses the 25LC512-I/SN to store user EQ presets, network credentials and last-state configuration. The SPI bus integrates with audio DSPs that already expose an SPI master for codec configuration. Low standby current (<1 µA in deep power-down) is critical for battery-powered devices, and the wide VCC range supports both lithium-cell (3.3 V) and USB (5 V) operation.
おすすめ
IoT and Smart Home Sensor Nodes
Wi-Fi and BLE sensor nodes deploy the 25LC512-I/SN to retain last-known state, mesh credentials and event timestamps across deep-sleep power cycles. The chip's <1 µA deep power-down current is negligible compared with the radio's standby drain, so it stays on the rail continuously. SPI access at 20 MHz keeps wake-time transactions short, preserving battery life on coin-cell or energy-harvested nodes in door sensors, leak detectors and HVAC peripherals.
おすすめ
Test and Measurement Datalogging
Bench instruments and data-acquisition modules use the 25LC512-I/SN to buffer sample data when the host processor is busy or the link to a PC is offline. The 128-byte page write matches well to packet sizes typical of UART-bridged sensors, and 1 million write-cycle endurance supports continuous logging in production-test fixtures. The wide 2.5–5.5 V range accepts USB, bench PSU and battery inputs without level translation.
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: 25LC512-I/SN — 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 | 25LC512-E/SN | 25LC512T-I/SN | 25AA512-I/SN | 25LC256-I/SN |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 8-SOIC (SN) | 8-SOIC (SN) - same | 8-SOIC (SN) - same | 8-SOIC (SN) - same | 8-SOIC (SN) - same |
| Memory Size | 512 Kbit (64 Kbyte) | 512 Kbit (64 Kbyte) - same | 512 Kbit (64 Kbyte) - same | 512 Kbit (64 Kbyte) - same | 256 Kbit (32 Kbyte) - 50% smaller |
| Interface | SPI up to 20 MHz | SPI up to 20 MHz - same | SPI up to 20 MHz - same | SPI up to 20 MHz - same | SPI up to 20 MHz - same |
| Supply Voltage (VCC) | 2.5 V to 5.5 V | 2.5 V to 5.5 V - same | 2.5 V to 5.5 V - same | 1.8 V to 5.5 V - wider low-end | 2.5 V to 5.5 V - same |
| Operating Temperature | -40 °C to +85 °C (I grade) | -40 °C to +125 °C (E grade) - wider | -40 °C to +85 °C (I grade) - same | -40 °C to +85 °C (I grade) - same | -40 °C to +85 °C (I grade) - same |
| Data Retention | 200 years | 200 years - same | 200 years - same | 200 years - same | 200 years - same |
| Endurance | 1,000,000 cycles/page | 1,000,000 cycles/page - same | 1,000,000 cycles/page - same | 1,000,000 cycles/page - same | 1,000,000 cycles/page - same |
主な差別化要因
- Highest-density SPI EEPROM in the 25LC family （vs 25LC256-I/SN)
- Standard 2.5 V minimum supply vs 1.8 V on 25AA512 （vs 25AA512-I/SN)
- Industrial -40 to +85 °C grade vs extended E grade （vs 25LC512-E/SN)
設計ノート
Place a 0.1 µF ceramic decoupling capacitor within 5 mm of the VCC pin, with a wide, short trace to the pin and a via (or two) to a continuous ground plane. Keep CS, SCK, SI, SO, WP and HOLD traces away from switching-converter or motor-drive nodes; a ground guard trace on both sides of the SPI bus reduces coupled noise. WP and HOLD should be tied directly to VCC (not left floating) when unused, to prevent inadvertent protection events during power-up transients.
Always poll the WIP (Write-In-Progress) bit of the status register before issuing a new write command - the SPI bus accepts commands immediately but the internal page write takes up to 5 ms (tWC). If you skip the poll and overwrite a page mid-write, the new data will be silently ignored or partially committed. Also note that page writes cannot cross a 128-byte boundary; back-to-back writes that exceed a page boundary roll over and overwrite within the same page.
At 20 MHz the SPI bus edge rates produce ringing on long PCB traces. Keep SCK routing under 50 mm and add a small source-series resistor (22-33 Ω) close to the master SCK pin if ringing exceeds VCC × 0.3 / V swing. Match trace impedance only if the bus runs above 10 cm; the 25LC512's SPI input thresholds are CMOS-style, so simple point-to-point routing is usually adequate.
Active read current at 20 MHz is approximately 5 mA typical at 5 V; standby current is ~1 µA when CS is held high. For battery-powered designs, hold CS high during deep sleep to enter the lowest-power state. Deep power-down via the DPD command is also available (and recommended for coin-cell designs) but requires a wake-up re-initialization sequence on the next access.
コンプライアンス情報
Pb-free and RoHS compliant per Microchip product page. Not AEC-Q100 qualified - for AEC-Q100 automotive applications, consider 25LC512-I/SN with extended automotive test flow under separate Microchip part numbers. Halogen-free status not explicitly stated in the verified web data.
