24LC64T-I/SN - 64Kbit I2C EEPROM, 400kHz, SOIC-8 | Microchip
料号： 24LC64T-I/SN ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.39 | $0.39 |
| 10 | $0.36 | $3.60 |
| 100 | $0.31 | $31.00 |
| 500 | $0.27 | $135.00 |
| 1,000 | $0.23 | $230.00 |
24LC64T-I/SN 概述
A serial EEPROM (Electrically Erasable Programmable Read-Only Memory) is a type of non-volatile memory that communicates over a simple 2-wire bus and retains data without power. In the system hierarchy it sits under non-volatile memory -> memory IC -> integrated circuit. Serial EEPROMs are valued for low pin count, low standby current, byte-level write granularity, and high endurance, making them well-suited for storing configuration, calibration, and user-data records that must survive power cycles.
Key features include 64 Kbit (8 KB) density in 8-bit width, single 2.5V to 5.5V supply operation, 1 uA typical standby current and 3 mA active current, hardware write-protect pin, 32-byte page write mode, more than 1 million erase/write cycles per page, and data retention greater than 200 years. The device also offers cascadable up to 8 devices on a single I2C bus via three address pins, allowing expansion up to 512 Kbit per bus segment.
The 24LC64 uses a CMOS process with on-chip charge pump for byte and page programming; the high-voltage generator produces the elevated programming voltage internally so no external VPP supply is needed. Schmitt-triggered SCL/SDA inputs improve noise immunity in industrial environments, while the dedicated WP pin lets designers freeze the upper 32 Kbit of array against accidental writes.
Typical applications include consumer-electronics configuration storage, industrial sensor calibration logs, smart-card parameter retention, automotive infotainment settings, and any battery-backed or energy-harvesting system requiring low standby current.
When designing with the 24LC64T-I/SN, observe the 2.5V minimum VCC for proper read/write and ensure pull-up resistors on SDA/SCL are sized for the total bus capacitance; 2.2 kohm to 10 kohm is typical for 400 kHz operation with multiple devices.
This page consolidates distributor pricing, drop-in same-brand and cross-brand alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替换替代料： 24LC64T-I/SN ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： 24LC64T-I/SN （相同外形与封装尺寸） ——差异在于 Access Time, Clock Frequency (max), Data Retention, Interface, MSL Level.
快速对比工具——选择替代料号进行并排对比：
24LC64-I/SN
✅ 直接替换📋 参考替代料（不在目录中）
24AA64T-I/SN
✅ 直接替换📋 参考替代料（不在目录中）
24FC64T-I/SN
✅ 直接替换📋 参考替代料（不在目录中）
24LC64T-E/SN
✅ 直接替换📋 参考替代料（不在目录中）
AT24C64C-SSHL-T
✅ 直接替换📋 参考替代料（不在目录中）
M24C64-FMN6TP
✅ 直接替换📋 参考替代料（不在目录中）
24LC64T-I/SN 规格参数
| 存储器类型 | EEPROM - Serial (I2C) |
| 存储容量 | 64 Kbit (8 KB) |
| Memory Organization | 8K x 8 |
| 接口 | I2C (2-wire serial), 400 kHz fast-mode |
| Clock Frequency (max) | 400 kHz |
| Access Time | 900 ns |
| Supply Voltage (VCC) | 2.5 V to 5.5 V |
| Active Read Current (max) | 3 mA (typical 1 mA) |
| Standby Current (max) | 1 uA typical |
| Write Cycle Time | 5 ms (byte/page) |
| Page Size | 32 bytes |
| Write Endurance | 1,000,000 cycles/page (min) |
| Data Retention | 200 years (min) |
| 工作温度 | -40C to +85C (Industrial) |
| 封装 | 8-pin SOIC (SN), 3.90 mm body |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 (per JEDEC J-STD-020) |
| RoHS 状态 | Compliant |
24LC64T-I/SN 引脚配置
| 引脚 1 | A0 — I2C slave address bit 0 (LSB) |
| 引脚 2 | A1 — I2C slave address bit 1 |
| 引脚 3 | A2 — I2C slave address bit 2 (MSB) |
| 引脚 4 | GND — Ground reference |
| 引脚 5 | SDA — I2C serial data (bidirectional, open-drain) |
| 引脚 6 | SCL — I2C serial clock input |
| 引脚 7 | WP — Write protect (active low; tie to VCC to protect upper 32 Kbit) |
| 引脚 8 | VCC — Positive supply, 2.5 V to 5.5 V |
典型应用
24LC64T-I/SN 适用于 6 应用s: Industrial Sensor Calibration Storage, Consumer Electronics Configuration Memory, Automotive Infotainment Settings Retention, Smart Card and RFID Parameter Storage, Battery-Backed Wearable Device Memory, Industrial PLC Module Identification and Logging.
Industrial Sensor Calibration Storage
The 24LC64T-I/SN suits industrial sensor calibration with its 64 Kbit (8 KB) density enough for hundreds of calibration coefficients per device and its -40C to +85C industrial grade matching factory-floor environments. Per the Microchip datasheet, byte-level write access and 1 million cycle endurance let calibration updates be performed in the field without array wear concerns. The 1 uA standby current keeps total quiescent drain negligible across thousands of deployed sensors. Designers typically tie SDA and SCL to a 2.2 kohm pull-up to a 3.3V rail and use the WP pin to lock calibration data after factory programming, preventing accidental field overwrites.
推荐
Consumer Electronics Configuration Memory
The 24LC64T-I/SN is widely used in consumer appliances, set-top boxes, and white goods to store user preferences, factory defaults, and last-state memory. Per the Microchip datasheet, the 32-byte page-write mode lets bulk configuration be loaded in milliseconds during boot, while the 2.5V to 5.5V VCC range covers both 3.3V and 5V designs without level shifting. Random byte access enables fast lookup of menu strings or channel maps. With 1 uA standby and 200-year retention, the part can hold configuration across the entire product lifetime without battery backup.
推荐
Automotive Infotainment Settings Retention
Although not AEC-Q100 qualified itself, the 24LC64T-I/SN stores radio presets, seat/mirror position, and HVAC settings in non-automotive-grade automotive subsystems such as aftermarket infotainment. Per the Microchip datasheet, 64 Kbit is sufficient for several hundred user preferences, and 1 million write cycles per page support frequent driver-side adjustments. Designers route SDA/SCL with 4.7 kohm pull-ups to the 5V rail and add ESD protection at the connector. For OEM-grade applications requiring AEC-Q100, the Microchip 24LC64-I/SN with the automotive equivalent is recommended instead.
推荐
Smart Card and RFID Parameter Storage
The 24LC64T-I/SN stores token credentials, access logs, and transaction counters in smart-card and RFID reader designs. Per the Microchip datasheet, hardware write-protect (WP) lets designers freeze security-critical sections while allowing updates to rolling counter areas. Cascading up to 8 devices on one I2C bus supports up to 512 Kbit per reader channel, sufficient for multi-application cards. The 5 ms page-write time is acceptable for transaction logging that occurs at human-interaction timescales.
推荐
Battery-Backed Wearable Device Memory
The 24LC64T-I/SN provides non-volatile parameter and activity-log memory in wearable and battery-powered IoT devices where standby current matters. Per the Microchip datasheet, the 1 uA typical standby current adds negligible drain to a 100 mAh coin cell while still preserving 8 KB of user data, step counts, or session state. The wide 2.5V-5.5V range tolerates battery droop across discharge. Its 8-SOIC footprint is well-suited to small PCBs and supports 400 kHz I2C for fast firmware retrieval.
推荐
Industrial PLC Module Identification and Logging
The 24LC64T-I/SN holds module identity, serial number, and event logs in industrial PLC backplanes and I/O modules. Per the Microchip datasheet, the cascadable 8-device address space lets a single I2C bus serve multiple slots, and 200-year data retention keeps module identity for the lifetime of the panel. The -40C to +85C industrial temperature range covers cabinet environments, while 32-byte page writes handle event-log appends efficiently. WP can be tied to ground during factory programming and floated in field service to enable in-place updates.
推荐
推荐产品汇总
工程参考数据： 24LC64T-I/SN ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 24LC64-I/SN | 24AA64T-I/SN | 24FC64T-I/SN | AT24C64C-SSHL-T | M24C64-FMN6TP |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology (Atmel) | STMicroelectronics |
| Package | 8-SOIC (SN) | 8-SOIC (SN) - same | 8-SOIC (SN) - same | 8-SOIC (SN) - same | 8-SOIC - same | 8-SOIC - same |
| Memory Size | 64 Kbit (8K x 8) | 64 Kbit (8K x 8) | 64 Kbit (8K x 8) | 64 Kbit (8K x 8) | 64 Kbit (8K x 8) | 64 Kbit (8K x 8) |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 1.7 V to 5.5 V (wider low-end) | 2.5 V to 5.5 V | 1.8 V to 5.5 V | 2.5 V to 5.5 V |
| I2C Max Clock | 400 kHz | 400 kHz | 400 kHz | 1 MHz (faster) | 400 kHz | 400 kHz |
| Operating Temperature | -40C to +85C (I grade) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| 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 |
| Page Size | 32 bytes | 32 bytes | 32 bytes | 32 bytes | 32 bytes | 32 bytes |
| Packaging Format | Tape & Reel | Tube | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel |
关键差异点
- Wide 2.5V-5.5V supply range covers 3.3V and 5V designs without level shifting （对比 M24C64-FMN6TP)
- Cascadable up to 8 devices on a single I2C bus for 512 Kbit per segment （对比 AT24C64C-SSHL-T)
- Industrial -40C to +85C temperature grade as standard （对比 24LC64T-E/SN)
设计说明
Per the Microchip datasheet, the SDA pin is open-drain and requires a pull-up resistor to VCC; the SCL pin is also open-drain input in multi-master systems. For 400 kHz operation with one EEPROM on the bus, 2.2 kohm to 4.7 kohm pull-ups are typical. With eight cascaded devices plus a master MCU on the same bus, drop to 2.2 kohm to meet the rise-time specification of 300 ns max. Add 100 nF decoupling close to VCC, returning directly to the GND pin.
Place the 24LC64T-I/SN within 50 mm of the master MCU to minimize bus capacitance and SCL/SDA trace ringing. Keep EEPROM traces away from switching converters and high-current digital returns; route them on an inner layer with continuous ground beneath. Per the Microchip datasheet, address pins A0/A1/A2 must be tied hard to either VCC or GND - never left floating, as this can cause the device to respond to multiple addresses or miss commands.
Estimated: at 400 kHz with 5V VCC, standby current is 1 uA typical but can rise to 5 uA at 125C and with all address pins in indeterminate state. The WP pin must be tied to GND to enable writes to the entire array; tying WP to VCC protects the upper 32 Kbit. Designers commonly miss that page writes (more than 32 bytes) wrap around and overwrite the start of the page. Use the per-page ack polling feature (write, then attempt read until ACK returns) to detect completion before the next I2C transaction.
合规信息
RoHS and REACH compliant per Microchip product page. Industrial temperature grade (-40C to +85C) but NOT AEC-Q100 qualified - for AEC-Q100 automotive applications use the 24LC64 automotive equivalent or the extended-temperature variant in a separate automotive part number. MSL Level 1 per JEDEC J-STD-020.
