Part A
AT24C512C-MAHM-T
微芯片科技
- Lifecycle
- Active
- Stock
- 2978 件
- Package
- UDFN-8
- Series
- 記憶力
Replacement verdict
Not a drop-in replacement
The AT24C512C-MAHM-T and AT24C04C-MAPD-E are both I²C serial EEPROM devices, but they differ fundamentally in memory density, package footprint, and operating voltage range, so the AT24C04C-MAPD-E cannot serve as a direct substitute for the AT24C512C-MAHM-T without design changes and validation.
Different memory density
Different package footprint
Different operating voltage
Different page size
Parts at a glance
Part B
AT24C04C-MAPD-E
微芯片科技
- Lifecycle
- Active
- Stock
- 8884 件
- Package
- UFDFN-8
- Series
- 記憶力
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AT24C512C-MAHM-T | AT24C04C-MAPD-E | Why it matters |
|---|---|---|---|
| Memory Density | 512 Kbit (64K x 8) | 4 Kbit (512 x 8) | The storage capacity differs by 128x; a 4 Kbit device cannot hold data written for a 512 Kbit device, so they are not functionally substitutable for storage size. |
| Memory Organization | 64K words x 8 bits | 512 words x 8 bits | Word count determines addressable locations; firmware addressing schemes differ significantly between these densities. |
| Package / Case | 8-UFDFN (2x3 mm) | 8-TSSOP | Different footprints require different PCB land patterns; a board designed for one package will not accept the other without redesign. |
| Operating Voltage Range | 1.7 V to 5.5 V | 1.7 V to 5.5 V | Both support the same wide supply range, so system-level voltage compatibility is equivalent. |
| Maximum Clock Frequency | 1 MHz (5 V), 400 kHz (1.7 V) | 1 MHz (5 V), 400 kHz (1.7 V) | Identical bus speed capability means timing budgets on the I2C bus remain the same. |
| Interface Type | I2C (2-wire) | I2C (2-wire) | Both use the same two-wire serial protocol, so host controller firmware protocol handling is compatible. |
| Number of Device Address Pins | A0, A1 (2 address pins) | A0, A1, A2 (3 address pins) | Address pin count affects how many devices can share the bus and how the address byte is decoded; the 4 Kbit part uses A2 while the 512 Kbit part repurposes that pin. |
| Page Size (Write Buffer) | 128 bytes | 16 bytes | Page write size determines maximum bytes per write cycle; firmware tuned for 128-byte pages may overflow a 16-byte page boundary on the smaller device. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean environmental operating limits are equivalent. |
| Write Cycle Endurance | 1,000,000 write cycles | 1,000,000 write cycles | Equal endurance ratings indicate comparable long-term reliability for write-intensive applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AT24C512C-MAHM-T | AT24C04C-MAPD-E |
|---|---|---|
| Supplier | - | Microchip Technology |
| Series | - | Automotive, AEC-Q100 |
| Part Status | Active | Active |
| Memory Type | Non-Volatile | Non-Volatile |
| Memory Format | EEPROM | EEPROM |
| Technology | EEPROM | EEPROM |
| Memory Size | 512Kb (64K x 8) | 4Kb (512 x 8) |
| Memory Interface | I²C | I²C |
| Clock Frequency | 400 kHz | 400 kHz |
| Write Cycle Time - Word Page | 5ms | 5ms |
| Access Time | 900 ns | 900 ns |
| Voltage - Supply | 1.7V ~ 3.6V | 2.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the AT24C512C-MAHM-T and AT24C04C-MAPD-E?
The AT24C512C-MAHM-T is a 512-Kbit (64K x 8) I²C serial EEPROM, while the AT24C04C-MAPD-E is a 4-Kbit (512 x 8) device. The AT24C512C offers 128 times the memory density of the AT24C04C. Both are I²C-compatible EEPROMs from Microchip Technology, but they differ in density, organization, and package options.
What are the memory densities and organizations of these two EEPROMs?
The AT24C512C-MAHM-T provides 524,288 bits organized as 65,536 words of 8 bits each (64K x 8). The AT24C04C-MAPD-E provides 4,096 bits organized as 512 words of 8 bits each (512 x 8). The AT24C512C uses a 16-bit internal word address, while the AT24C04C uses a 9-bit address with the upper bit carried in the device address byte.
What I²C bus speeds do the AT24C512C-MAHM-T and AT24C04C-MAPD-E support?
Both devices support the standard I²C Fast Mode at 400 kHz and Standard Mode at 100 kHz. The AT24C512C additionally supports Fast Mode Plus at 1 MHz, allowing higher throughput for the larger memory array. Designers should verify the specific speed grade against the manufacturer datasheet for the exact ordering code.
What supply voltage ranges do these two devices require?
The AT24C512C-MAHM-T operates from 1.7 V to 5.5 V, supporting low-voltage and standard 5 V systems. The AT24C04C-MAPD-E operates from 1.7 V to 5.5 V as well, making both devices suitable for a wide range of portable and industrial applications. Always confirm the voltage range for the specific ordering code in the datasheet.
What package types are used for the AT24C512C-MAHM-T and AT24C04C-MAPD-E?
The AT24C512C-MAHM-T is supplied in an 8-lead UDFN package (the "MAHM" suffix denotes UDFN). The AT24C04C-MAPD-E is supplied in an 8-lead TSSOP package (the "MAPD" suffix denotes TSSOP). Package footprint and land pattern differences must be considered when evaluating board-level compatibility.
Can the AT24C04C-MAPD-E be used as a drop-in replacement for the AT24C512C-MAHM-T?
No. The two devices differ in memory density (4 Kbit vs 512 Kbit), internal addressing scheme, and package type (TSSOP vs UDFN). A drop-in replacement is not possible without redesigning the PCB footprint and updating firmware to handle the different address structure and reduced storage capacity.
What are the typical end applications for each device?
The AT24C512C-MAHM-T, with its larger 512-Kbit density, is suited for applications requiring substantial non-volatile data storage such as configuration data, calibration tables, and data logging. The AT24C04C-MAPD-E, with 4 Kbit, is typically used for small parameter storage, device identification, and simple configuration settings in cost-sensitive designs.
Do both devices support the same I²C device address scheme?
Both use a 7-bit I²C slave address with a fixed 1010 prefix. However, the AT24C512C uses all three address pins (A0, A1, A2) for device selection, allowing up to eight devices on the bus. The AT24C04C uses A1 and A2 for device selection while A0 is not used for addressing, and the ninth bit of the word address is embedded in the device address byte, allowing up to four devices on the bus.