AT24C02D-MAHM-T - 2Kb I2C EEPROM 1MHz 8-UDFN | Microchip
料号： AT24C02D-MAHM-T ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.33 | $0.33 |
| 10 | $0.3 | $3.00 |
| 100 | $0.26 | $26.00 |
| 500 | $0.23 | $115.00 |
| 1,000 | $0.21 | $210.00 |
AT24C02D-MAHM-T 概述
An EEPROM (Electrically Erasable Programmable Read-Only Memory) is a type of non-volatile memory that retains data without power and supports byte-level erase/write cycles via an electrical charge rather than ultraviolet light. Within the broader memory hierarchy, EEPROM sits between one-time-programmable ROM and higher-density flash memory, offering 1-10 million write/erase cycles per cell and 100+ year data retention. EEPROM devices like the AT24C02D belong to the serial-interface subcategory used for storing configuration parameters, calibration constants, and event logs in space-constrained designs.
Key features of the AT24C02D-MAHM-T include a wide supply-voltage range of 1.7 V to 3.6 V, low standby current of 1 uA typical, hardware write protection via a WP pin, and a 16-byte page write buffer for efficient bulk programming. The device supports Standard Mode (100 kHz), Fast Mode (400 kHz), and Fast-Plus Mode (1 MHz) I2C operation. The 8-UDFN package (2 mm x 3 mm) reduces board area by approximately 60% versus 8-SOIC, making it suitable for compact consumer and industrial modules.
The AT24C02D uses an advanced CMOS process with internal charge pump circuitry for byte and page write operations, eliminating the need for an external high-voltage programming supply. The I2C slave address is hardwired via the device part suffix, and three address pins (A0-A2) support up to eight devices sharing a single bus for multi-EEPROM systems. The exposed thermal pad on the UDFN-8 package improves mechanical solder joint reliability under thermal cycling.
Typical applications include consumer-electronics configuration storage, industrial sensor calibration memory, LCD monitor DDC/EDID storage, smart-card reader parameter retention, and IoT device settings backup. The device is qualified for industrial temperature ranges (-40 C to +85 C), making it suitable for outdoor and harsh-environment systems.
When designing with this part, place 0.1 uF decoupling capacitors close to the VCC pin and observe the 5 ms maximum page-write completion time before initiating the next I2C transaction. The WP pin must be grounded for read/write operation or tied to VCC for hardware write locking, depending on application security requirements.
This page synthesizes distributor pricing from DigiKey and Mouser, drop-in alternatives within the same UDFN-8 footprint, and practical design notes not consolidated in the manufacturer datasheet.
直接替换替代料： AT24C02D-MAHM-T ——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： AT24C02D-MAHM-T （相同外形与封装尺寸） ——差异在于 RoHS Status, Data Retention, MSL Level, Memory Type, Operating Temperature Range.
快速对比工具——选择替代料号进行并排对比：
AT24C02D-MAHM-E
✅ 直接替换📋 参考替代料（不在目录中）
AT24C01D-MAHM-T
✅ 直接替换📋 参考替代料（不在目录中）
AT24C04D-MAHM-T
✅ 直接替换📋 参考替代料（不在目录中）
M24C02-RMN6TP
✅ 直接替换✓ 有现货
$0.075 / 个
查看数据手册 →24AA02-I/SN
✅ 直接替换📋 参考替代料（不在目录中）
24LC02B-I/SN
✅ 直接替换📋 参考替代料（不在目录中）
AT24C02D-MAHM-T 规格参数
| 存储器类型 | EEPROM - Serial |
| 存储容量 | 2 Kbit (256 x 8) |
| Memory Organization | 256 x 8 |
| 接口 | I2C (2-wire serial) |
| 最大时钟频率 | 1 MHz |
| Access Time | 4.5 us (max) |
| Supply Voltage Range | 1.7 V to 3.6 V |
| Operating Current (Read) | 1 mA (max at 400 kHz) |
| Standby Current | 1 uA (typical) |
| Write Cycle Time (Byte/Page) | 5 ms (max) |
| Page Write Buffer Size | 16 bytes |
| Write Endurance | 1,000,000 cycles per byte (typical) |
| Data Retention | 100 years (typical) |
| 工作温度范围 | -40 C to +85 C (Industrial) |
| 封装 | 8-UDFN Exposed Pad (2 mm x 3 mm) |
| 安装类型 | Surface Mount |
| MSL 等级 | 1 (Unlimited) |
| RoHS 状态 | Compliant (NiPdAu lead finish, halogen-free) |
| Write Protection Pin | Yes (WP, active-high) |
| Address Pins | A0, A1, A2 (allow 8 devices on bus) |
AT24C02D-MAHM-T 引脚配置
| 引脚 1 | A0 — Slave address bit 0 (hardwired; connect to VCC or GND) |
| 引脚 2 | A1 — Slave address bit 1 (hardwired; connect to VCC or GND) |
| 引脚 3 | A2 — Slave address bit 2 (hardwired; connect to VCC or GND) |
| 引脚 4 | GND — Ground reference |
| 引脚 5 | SDA — I2C serial data (open-drain; requires external pull-up) |
| 引脚 6 | SCL — I2C serial clock (requires external pull-up) |
| 引脚 7 | WP — Write protect (tie to VCC = write-protected, GND = writable) |
| 引脚 8 | VCC — Supply voltage (1.7 V to 3.6 V) |
典型应用
AT24C02D-MAHM-T 适用于 7 应用s: Consumer Electronics Configuration Storage, Industrial Sensor Calibration Memory, Display DDC/EDID Storage, Smart-Card Reader Parameter Retention, IoT Device Settings Backup, Audio Equipment User-Preset Storage, Automotive Infotainment Non-Volatile Memory.
Consumer Electronics Configuration Storage
The AT24C02D-MAHM-T stores factory calibration constants, user preferences, and feature flags in compact consumer products such as smart-home sensors, wearables, and remote controls. Its 256-byte (2 Kbit) capacity accommodates typical use cases like Wi-Fi credentials, default brightness/volume tables, and device-pairing tokens. The 1.7-3.6 V supply matches battery-direct operation from a single Li-ion / 2xAA cell, and the 1 uA standby current is negligible against the main MCU's draw. The 8-UDFN (2 mm x 3 mm) footprint enables integration into miniaturized PCBs where SOIC-8 alternatives would consume too much board area. Designers should reserve the WP pin connection for hardware lock during firmware update flows to prevent accidental writes during brown-out events.
推荐
Industrial Sensor Calibration Memory
The AT24C02D-MAHM-T serves as non-volatile calibration memory for industrial sensor modules including pressure transmitters, gas detectors, and flow meters. Its 1 million write cycles per byte and 100-year data retention support periodic in-place recalibration without EEPROM replacement, and the industrial -40 C to +85 C temperature range survives harsh factory-floor environments. The 1 MHz I2C clock allows fast block reads during startup to populate compensation lookup tables in the host processor before the first measurement cycle. Engineers can use the three address pins (A0-A2) to place up to 8 EEPROMs on one bus for multi-channel sensor modules with separate calibration banks per channel.
推荐
Display DDC/EDID Storage
The AT24C02D-MAHM-T is widely used as DDC/EDID EEPROM in monitors, docking stations, and HDMI/DisplayPort adapters. The 256-byte capacity matches the EDID 1.4 baseline plus extension blocks up to 128 bytes, and the 100 kHz standard-mode I2C operation matches the DDC bus specification. Hardware write protection via the WP pin can be used to lock EDID contents during manufacturing test. The wide temperature range supports both commercial and industrial monitor designs. Designers should include 4.7 kohm pull-ups on SDA and SCL and a 0.1 uF decoupling cap within 5 mm of the VCC pin.
推荐
Smart-Card Reader Parameter Retention
The AT24C02D-MAHM-T retains transaction counters, last-status flags, and security keys in point-of-sale (POS) terminals and smart-card readers. Its 5 ms page-write time is fast enough to log a transaction atomically without blocking the card interface, and the 1.7 V minimum supply survives coin-cell backup during main power loss. The hardware WP pin enables secure key lockdown after factory provisioning. The compact UDFN-8 package integrates into handheld PIN-pad modules where board area is at a premium. Engineers should pair the EEPROM with a battery-backed RTC for time-stamping logged transactions.
推荐
IoT Device Settings Backup
The AT24C02D-MAHM-T provides reliable settings storage in wireless IoT nodes including BLE beacons, LoRaWAN sensors, and Wi-Fi modules. The 1 uA standby current is negligible against the host MCU's deep-sleep draw (~5-10 uA typical), making the EEPROM essentially free in battery-budget calculations. The 256-byte capacity supports mesh-network credentials, encryption keys, and device-identifying tokens. The 8-UDFN footprint integrates into coin-cell-powered beacons where total PCB area must stay below 10 mm x 10 mm. Designers should use the WP pin to lock the EEPROM during over-the-air (OTA) firmware updates to prevent partial writes during brown-out.
推荐
Audio Equipment User-Preset Storage
The AT24C02D-MAHM-T stores user-preset configurations, EQ tables, and recall-state data in professional audio equipment including mixers, amplifiers, and digital effects units. The 1 MHz I2C clock allows fast preset-switching without audible glitches, and the 5 ms write cycle supports per-channel preset save within a single MIDI footswitch press. The exposed thermal pad on the UDFN-8 package aids heat dissipation in enclosed rack-mount chassis. Engineers can use the 3 address pins to parallel up to 8 EEPROMs for multi-bank preset memory architectures in live-sound consoles.
推荐
Automotive Infotainment Non-Volatile Memory
The AT24C02D-MAHM-T supports non-volatile storage in automotive infotainment head units, instrument clusters, and HVAC control modules for storing user preferences, last-radio-station memory, and seat-position profiles. While the part itself is not AEC-Q100 qualified, its industrial -40 C to +85 C temperature range is suitable for cabin electronics that do not see under-hood thermal stress. The 256-byte capacity is ideal for storing one or two named profiles per occupant. Designers building automotive designs requiring formal AEC-Q100 qualification should migrate to the AT24C02C-SSHM-T (which carries automotive-grade screening) or to AEC-Q100-qualified alternates such as M24C02-WDW6TP from STMicroelectronics.
推荐
推荐产品汇总
工程参考数据： AT24C02D-MAHM-T ——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 | AT24C02D-MAHM-E | AT24C01D-MAHM-T | AT24C04D-MAHM-T | M24C02-RMN6TP | 24AA02-I/SN |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | STMicroelectronics | Microchip Technology |
| Package | 8-UDFN (2x3 mm) | 8-UDFN (2x3 mm) | 8-UDFN (2x3 mm) | 8-UDFN (2x3 mm) | 8-SO (150 mil) | 8-SOIC (3.90 mm) |
| Memory Size | 2 Kbit (256 x 8) | 2 Kbit | 1 Kbit (-50%) | 4 Kbit (+100%) | 2 Kbit | 2 Kbit |
| Interface | I2C, 1 MHz | I2C, 1 MHz | I2C, 1 MHz | I2C, 1 MHz | I2C, 400 kHz | I2C, 400 kHz |
| Supply Voltage Range | 1.7 V to 3.6 V | 1.7 V to 3.6 V | 1.7 V to 3.6 V | 1.7 V to 3.6 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Standby Current (typ) | 1 uA | 1 uA | 1 uA | 1 uA | 2 uA | 1 uA |
| Write Endurance | 1M cycles | 1M cycles | 1M cycles | 1M cycles | 1M cycles | 1M 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 |
关键差异点
- Wider 1.7-3.6 V supply range for low-voltage designs （对比 AT24C02C-SSHM-T)
- Higher 1 MHz I2C clock versus 400 kHz standard （对比 24AA02-I/SN)
- Compact 2 mm x 3 mm UDFN footprint （对比 M24C02-RMN6TP (SO-8))
设计说明
Place a 0.1 uF decoupling capacitor within 5 mm of the VCC pin (pin 8) and a 4.7 kohm pull-up resistor on both SDA and SCL lines to VCC. The I2C bus specification requires the RC time constant to allow SCL to settle within 1/10th of the clock period at the highest supported frequency. For 1 MHz operation, lower pull-ups to 2.2 kohm and verify rise time with an oscilloscope.
Estimated: at 1 MHz I2C with a 50 pF bus capacitance and 2.2 kohm pull-up, the SCL rise time is approximately 110 ns, which is well within the 300 ns maximum specified by the Fast-Plus Mode I2C standard. If designing with multiple devices on the bus, calculate the cumulative bus capacitance before selecting pull-up values, and consider a bus repeater (such as the LTC4311) for capacitive loads above 200 pF.
Do not exceed the maximum supply voltage of 3.6 V - the device is NOT 5 V compatible despite many legacy EEPROMs being so. For 5 V designs, use the AT24C02C-SSHM-T or 24AA02-I/SN instead. Always issue a STOP condition after a write command and wait the full 5 ms tWR before initiating the next I2C transaction; polling the device before tWR elapses returns NACK and can corrupt data.
The exposed thermal pad on the UDFN-8 package must be soldered to a PCB copper pour of at least 10 mm x 10 mm for reliable thermal performance and mechanical solder joint reliability. Although the EEPROM itself dissipates negligible power, the exposed pad prevents PCB bending-induced pad lift during temperature cycling in industrial environments.
合规信息
RoHS compliant per Microchip product page (NiPdAu lead finish, PB-free / HALO-free construction per Mouser listing). Not AEC-Q100 qualified - automotive designs should use AT24C02C-SSHM-T or qualified alternatives.
