AT24C64CN-SH-B - 64Kb I2C EEPROM, 1.8-5.5V, 8-SOIC | Microchip
部品番号: AT24C64CN-SH-B ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0.46 | $0.46 |
| 10 | $0.42 | $4.20 |
| 100 | $0.36 | $36.00 |
| 500 | $0.31 | $155.00 |
| 1,000 | $0.27 | $270.00 |
AT24C64CN-SH-B 概要
Background: A serial-EPR line is a non-volatile memory that stores small amounts of data persistently and is electrically erasable EEPROM (Electrically Erasable Programmable Read-Only Memory). As a category, serial EEPROMs belong to non-volatile memory (NVM) -> memory IC -> semiconductor IC, and sit alongside Flash and battery-backed SRAM in the storage hierarchy. Unlike parallel EEPROMs, serial parts trade bus width for pin count, using 2-wire protocols (I²C, SPI, Microwire) so a tiny 8-pin package can hold 64 Kbit. The AT24C family targets low-density configuration, user settings, black-box logs and trim/calibration storage where byte-level write endurance exceeds what Flash offers.
Key features include hardware-compatibility software support for standard, fast (400 kHz) and fast-plus (1 MHz) I²C modes, software-programmable device addresses (A0/A1/A2 pins allowing up to eight devices on a single bus), 32-byte page write buffer for efficient multi-byte writes, hardware write-protect pin, and self-timed write cycle. The 8-SOIC (3.90 mm body width) provides industrial throughput over the standard SO-8 footprint and eases hand-soldering, hand-rework and breadboarding. Operating temperature spans -40°C to +85°C for the CN-series consumer/industrial grade.
Technical depth: Internally the AT24C64CN uses a CMOS floating-gate cell array with on-chip charge pump for high-voltage generation, an I²C slave state machine with SCL/SDA glitch suppression, and a 32-byte page-latch between the I²C bus and the EEPROM array. The device supports sequential read for the entire 8 KB and uses acknowledge polling (ACK to verify) to detect write completion without busy-pin monitoring. JEDEC JESD22 standard testing applies to moisture sensitivity and thermal-shock reliability of the SOIC package.
Typical applications include storing user preferences in LCD/TV monitors, EMS (energy-management system) calibration constants in smart thermostats, IC firmware-language configuration in industrial controller settings, logging sensor-tag IDs in meter readers, and storing system frequency-locking tables in car infotainment modules. Each application benefits from the 1 MHz bus speed (fast firmware load), 32-byte page write (fast bulk update), and 1M-cycle endurance (long in-field life).
Design consideration: When migrating designs that previously used AT24C32/AT24C256 parts, identify the common I²C protocol: write-protocol compatibility for easy drop-in. Verify A0/A1/A2 address-pin strapping to avoid bus collisions, and add pull-up resistors (typically 2.2 kΩ to 10 kΩ depending on bus capacitance) on SDA and SCL for reliable operation above 400 kHz.
ドロップイン代替品: AT24C64CN-SH-B — 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: AT24C64CN-SH-B （同一形状・フットプリント） — 相違点: Data Retention, Interface, MSL Level, Memory Type, Package.
クイック比較ツール — 並列比較する代替部品を選択:
AT24C64CN-SH-T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
24LC64T-I/SN
✅ ドロップイン✓ 在庫あり
$0.23 / 個
データシートを見る →CAT24C64WI-GT3
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AT24C64CN-SH-B 最大定格＆電気的特性
| メモリタイプ | Non-volatile EEPROM (Electrically Erasable Programmable Read-Only Memory) |
| メモリサイズ | 64 Kbit (8 K × 8) |
| メモリ構成 | 8 K × 8 (8,192 bytes) |
| インターフェース | I²C (2-wire serial) |
| Clock Frequency (max) | 1 MHz (Fast-Plus mode) |
| Access Time | 550 ns |
| Operating Voltage Range | 1.8 V to 5.5 V |
| Write Endurance | 1,000,000 erase/write cycles |
| Data Retention | >40 years |
| Programmable Device Addresses | Up to 8 devices (A0/A1/A2 pins) |
| Write Protection | Hardware WP pin |
| 動作温度範囲 | -40 °C to +85 °C |
| パッケージ | 8-SOIC (3.90 mm / 0.154" body width) |
| 実装タイプ | Surface Mount |
| MSLレベル | MSL 1 (per JEDEC J-STD-020) |
| Lead-Free / RoHS | Yes / Compliant |
| ハロゲンフリー | Yes |
AT24C64CN-SH-B ピン構成
| ピン 1 | A0 — Device address input bit 0 (connect to GND/VCC for address selection) |
| ピン 2 | A1 — Device address input bit 1 (connect to GND/VCC for address selection) |
| ピン 3 | A2 — Device address input bit 2 (connect to GND/VCC for address selection) |
| ピン 4 | GND — Ground reference |
| ピン 5 | SDA — I²C serial data (open-drain, requires external pull-up) |
| ピン 6 | SCL — I²C serial clock (open-drain, requires external pull-up) |
| ピン 7 | WP — Write-protect (active-high: disables writes when HIGH) |
| ピン 8 | VCC — Power supply (1.8 V to 5.5 V) |
主な用途
AT24C64CN-SH-B の用途: 7 件s: Industrial Controller Configuration Storage, Smart Meter Calibration Data Storage, Consumer LCD/TV Display Settings Memory, Automotive Infotainment System Storage, IoT Sensor Hub Configuration and Tag Logger, Medical Device Calibration and Patient Data, Black-Box Flight Data Recorder.
Industrial Controller Configuration Storage
The AT24C64CN-SH-B stores user-configurable parameters, calibration constants and OEM settings in industrial controllers where non-volatile retention is mandatory across power cycles. Its 8 K byte (64 Kbit) capacity comfortably fits machine IDs, setpoints, trimming tables, and PID gain constants for motor drives and PLCs. The 1 MHz Fast-Plus I²C bus lets a host MCU load its configuration block in a single sequential burst, while 1,000,000 write cycles endurance support the runtime of industrial runtime where setup changes happen frequently. The 1.8 V to 5.5 V supply range means the same part fits 3.3 V MCU rails and 5 V legacy interfaces, and the -40 °C to +85 °C industrial temperature grade ensures operation in unheated cabinets.
おすすめ
Smart Meter Calibration Data Storage
Electricity, water and gas meters use the AT24C64CN-SH-B to store calibration coefficients, meter IDs, tamper flags, and rolling consumption logs. Its 8 K byte memory holds per-phase trim values, tariff tables, and rolling 30-day history buffers typical of residential smart meters. The 1 MHz I²C speed supports the runtime of smart runtime firmware that reads all calibration values during meter startup, and the 32-byte page write buffer lets the MCU commit a full set of calibration trim values in a single page write. Hardware write-protect prevents the runtime of smart runtime during firmware updates, and the 1.8 V minimum supports battery-backed meters running from single-cell Li-ion or supercap rails.
おすすめ
Consumer LCD/TV Display Settings Memory
LCD monitors and televisions use the AT24C64CN-SH-B to remember picture-mode preferences, color-temperature settings, HDMI-input labels, and user EQ presets across the display power-down power-up cycle. Its 8 K byte holds roughly 50-100 user settings including backlight brightness, gamma curves, and aspect-ratio modes per input. The 1 MHz I²C lets the video processor initialize the display quickly during boot, and the 1,000,000 write-cycle endurance supports frequent setting changes by end-users over a typical product lifetime of 7-10 years. The 8-SOIC package fits space-constrained T-CON boards, and RoHS compliance meets consumer electronics environmental regulations.
おすすめ
Automotive Infotainment System Storage
Automotive infotainment head units employ the AT24C64CN-SH-B for radio presets, paired Bluetooth device lists, navigation favourites, and driver-profile preferences that must survive key-off battery disconnect. The 8 K byte holds radio presets for AM/FM/DAB+, paired phone IDs, and the runtime of automotive runtime of seat/mirror position tables in body-control modules. The 1 MHz Fast-Plus I²C supports fast startup during the sync loader of head-unit sync, and the 32-byte page buffer lets the MCU commit an entire radio preset block atomically. Hardware write-protect pins prevent unintended writes during the runtime of automotive runtime where voltage transients are common.
おすすめ
IoT Sensor Hub Configuration and Tag Logger
Wireless sensor nodes for IoT applications use the AT24C64CN-SH-B to store sensor calibration data, network security keys, device certificates, and rolling event logs that must persist across battery swaps. The 8 K byte comfortably holds Zigbee/Z-Wave/Wi-Fi join keys, X.509 certificates, and a 1-2 day rolling buffer of sensor readings or alarm events. The 1.8 V minimum supply supports direct connection to coin-cell or single-cell Li-ion batteries, and the 1 µA standby supply is exceptionally low for battery-powered designs, where sleep current is critical. The 1 MHz I²C speed supports the runtime of IoT runtime where the SoC wakes briefly to read configuration and write sensor events.
おすすめ
Medical Device Calibration and Patient Data
Medical monitoring equipment such as glucose meters, blood pressure monitors, and pulse oximeters use the AT24C64CN-SH-B to store patient-specific calibration data, measurement history, and device configuration that must survive battery replacement. The 8 K byte holds glucose reading history for the last 200-400 measurements with timestamps, or stores calibration trim values for the optical sensor frontend. The 1.8 V to 5.5 V supply supports battery-powered operation, and the >40-year data retention matches the medical device shelf-life regulatory requirements. Hardware write-protect prevents accidental corruption of patient data during the runtime of medical runtime where electromagnetic interference is common.
おすすめ
Black-Box Flight Data Recorder
Industrial black-box data recorders and avionics subsystems use the AT24C64CN-SH-B for tamper, vibration, and event log storage in unmanned aerial vehicles (UAVs), industrial drones, and flight data monitoring systems. The 8 K byte stores recent flight parameter snapshots, error logs, and runtime of black-box runtime where the box must survive crashes and high-impact events. The 1 MHz I²C bus lets the flight controller write a full set of flight parameters in a single page write, and the 32-byte page buffer optimizes multi-byte writes. The -40 °C to +85 °C operating temperature covers the operating temperature of industrial UAVs operating at altitude and in cold environments, and the >40-year data retention supports long-term archival of diagnostic records.
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: AT24C64CN-SH-B — 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 | AT24C64CN-SH-T | 24LC64T-I/SN | CAT24C64WI-GT3 | M24C64-WMN6P | BR24L64-W |
|---|---|---|---|---|---|---|
| Package | 8-SOIC (3.90 mm) | 8-SOIC (3.90 mm) - same | 8-SOIC (3.90 mm) - same | 8-SOIC (3.90 mm) - same | 8-SO (different body) | 8-SOIC (different body) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | onsemi | STMicroelectronics | ROHM Semiconductor |
| Memory Size | 64 Kbit (8 K × 8) | 64 Kbit (8 K × 8) | 64 Kbit (8 K × 8) | 64 Kbit (8 K × 8) | 64 Kbit (8 K × 8) | 64 Kbit (8 K × 8) |
| Operating Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 2.5 V to 5.5 V | 1.8 V to 5.5 V | 2.5 V to 5.5 V | 1.8 V to 5.5 V |
| Max Clock Frequency | 1 MHz (Fast-Plus) | 1 MHz | 400 kHz | 1 MHz | 1 MHz | 400 kHz |
| Page Write Buffer | 32 bytes | 32 bytes | 32 bytes | 32 bytes | 32 bytes | 32 bytes |
| Write Endurance | 1,000,000 cycles | 1,000,000 cycles | 1,000,000 cycles | 1,000,000 cycles | 1,000,000 cycles | 1,000,000 cycles |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Hardware WP Pin | Yes | Yes | Yes | Yes | Yes | Yes |
| Packaging Format | Bulk (-B) | Tape & Reel (-T) | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel |
主な差別化要因
- Wide 1.8 V to 5.5 V supply range covers 1.8 V, 2.5 V, 3.3 V, and 5 V rails （vs 24LC64T-I/SN)
- 1 MHz Fast-Plus I²C support doubles throughput vs 400 kHz parts （vs 24LC64T-I/SN / BR24L64-W)
- Cross-brand drop-in availability with CAT24C64 （vs CAT24C64WI-GT3)
設計ノート
Place the AT24C64CN-SH-B as close as possible to the host MCU's I²C SDA/SCL pins to minimize bus capacitance and trace stubs. Per the manufacturer datasheet, the I²C bus requires external pull-ups; use 2.2 kΩ to 4.7 kΩ resistors to VCC for typical bus speeds, or 1 kΩ for 1 MHz Fast-Plus operation with multiple devices. Keep traces short and avoid routing SDA/SCL near switching power or RF traces to prevent coupling. Decouple VCC with a 100 nF ceramic capacitor placed within 5 mm of pin 8.
Do not leave A0, A1, A2 floating; tie each pin to either GND or VCC. Floating address pins can cause oscillator glitches and may intermittently pull the bus to wrong state. The WP pin (pin 7) must be tied to GND if write protection is not needed, or to a GPIO if the host needs to control write protection. A floating WP pin prevents writes when unintentionally pulled HIGH. For multi-master buses, the device supports bus arbitration but requires correct I²C protocol handling by the host MCU.
The AT24C64CN-SH-B supports 1 MHz Fast-Plus I²C but bus capacitance (Cb, trace, model) must stay below 100 pF total for reliable signal integrity at full speed. Each device adds 8-10 pF, so a bus of 4 devices plus MCU + traces easily approaches the limit. Use a bus extender or buffer if more devices are needed. The SDA and SCL pins are open-drain; never drive them HIGH actively. For multi-drop designs, verify SDA and SCL are open-drain: never drive them HIGH actively.
コンプライアンス情報
RoHS compliant, lead-free, halogen-free per manufacturer datasheet. MSL 1 per JEDEC J-STD-020. Not AEC-Q100 qualified; use AT24C64C-MAHM-T or similar automotive-grade parts for AEC-Q100 designs.
