Part A
AT24C02C-MAHM-T
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Replacement verdict
Compatible functional replacement candidate
The AT24C04C-MAPD-E is a functional replacement candidate for the AT24C02C-MAHM-T, sharing the same I²C serial EEPROM interface, 1.7 V to 5.5 V supply range, and 5-pin SOT-23 footprint, while doubling the memory density from 2 Kbit to 4 Kbit. Designers must account for the larger memory organization and confirm the device address configuration before substituting in existing layouts.
Memory Density
High match
Interface Type
High match
Package Type
High match
Supply Voltage Range
Validation required
Parts at a glance
Part B
AT24C04C-MAPD-E
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Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AT24C02C-MAHM-T | AT24C04C-MAPD-E | Why it matters |
|---|---|---|---|
| Memory Density | 2 Kbit (256 x 8) | 4 Kbit (512 x 8) | The total storage capacity differs by a factor of two, so the 4 Kbit device can hold twice the data and is not a drop-in replacement where the full address space is used. |
| Organization | 256 pages x 8 bits (single 256-byte page) | 512 x 8 bits organized as 2 pages of 256 bytes | The 4 Kbit part uses a page-select bit in the device address byte, so the I2C addressing scheme differs and firmware must account for the extra address bit. |
| Device Address Bits Used | A2, A1, A0 all used for chip select | A2, A1 used for chip select; A0 used as page-select (P0) | Address pin functionality changes between the two parts, affecting how many devices can share the bus and how the memory is addressed. |
| Package / Mounting | 8-lead UDFN (surface mount) | 8-lead PDIP (through-hole) | Different package and mounting styles require different PCB footprints and assembly processes, preventing direct board-level substitution. |
| Operating Temperature Range | -40°C to +85°C (industrial) | -40°C to +85°C (industrial) | Both parts share the same industrial temperature range, so thermal suitability is equivalent for the application. |
| Supply Voltage Range | 1.7 V to 5.5 V | 1.7 V to 5.5 V | Identical wide supply range means both devices work across the same low-voltage and 5 V systems. |
| Interface / Bus Speed | I2C, up to 1 MHz (Fast Mode Plus) | I2C, up to 1 MHz (Fast Mode Plus) | Same I2C interface and maximum clock rate allow equivalent bus timing and throughput in the design. |
| Write Cycle Time | 5 ms max internal write cycle | 5 ms max internal write cycle | Matching write cycle timing means firmware polling and timing budgets remain the same for both parts. |
| Endurance | 1,000,000 write cycles | 1,000,000 write cycles | Equal endurance ratings indicate comparable long-term reliability for frequently rewritten data. |
| Data Retention | 100 years | 100 years | Identical retention specification confirms both parts are equally suitable for long-life non-volatile storage. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AT24C02C-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 | 2Kbit | 4Kb (512 x 8) |
| Memory Interface | I2C | I²C |
| Clock Frequency | 1 MHz | 400 kHz |
| Write Cycle Time - Word Page | - | 5ms |
| Access Time | 550 ns | 900 ns |
| Voltage - Supply | 1.7V ~ 5.5V | 2.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Base Product Number | AT24C02 | - |
| Digi Key Programmable | Not Verified | - |
| Memory Organization | 256 x 8 | - |
| Write Cycle Time - Word, Page | 5ms | - |
| Packaging | Cut Tape (CT), Tape & Reel (TR) | - |
Frequently asked questions
What are the key differences between the AT24C02C-MAHM-T and AT24C04C-MAPD-E?
The primary differences are memory density, package, and operating temperature range. The AT24C02C-MAHM-T is a 2-Kbit (256 x 8) I²C EEPROM in a 5-lead SOT-23 package rated for -40°C to +85°C, while the AT24C04C-MAPD-E is a 4-Kbit (512 x 8) I²C EEPROM in an 8-lead PDIP package rated for -40°C to +125°C.
Are the AT24C02C-MAHM-T and AT24C04C-MAPD-E pin-compatible?
No. The AT24C02C-MAHM-T uses a 5-lead SOT-23 package, whereas the AT24C04C-MAPD-E uses an 8-lead PDIP package. They differ in pin count, package footprint, and PCB land pattern, so they are not drop-in replacements.
What is the memory organization of each device?
The AT24C02C-MAHM-T is organized as 256 pages of 8 bits (2 Kbit total), and the AT24C04C-MAPD-E is organized as 512 pages of 8 bits (4 Kbit total). Both use a 2-wire I²C serial interface and support byte and page write operations.
What supply voltage range do these EEPROMs support?
Both the AT24C02C-MAHM-T and AT24C04C-MAPD-E operate from a 1.7V to 5.5V supply, supporting both 1.8V and 3.3V/5V logic systems per the Microchip datasheet.
How do the operating temperature ranges compare?
The AT24C02C-MAHM-T is specified for -40°C to +85°C (industrial temperature range), while the AT24C04C-MAPD-E is specified for -40°C to +125°C (extended temperature range), making the latter suitable for higher-temperature environments.
What are the I²C device address differences between the two parts?
The AT24C02C uses a fixed 3-bit device address (1010) plus a read/write bit, allowing up to eight devices on the bus. The AT24C04C uses a 2-bit device address plus one address bit (A2) for memory block selection, so the addressable device count and addressing scheme differ between the two parts.
Can the AT24C04C-MAPD-E be used as a direct substitute for the AT24C02C-MAHM-T in an existing design?
No. Although both are I²C EEPROMs with similar voltage ranges, they differ in memory density, package type, pin count, and temperature rating. A direct substitution would require PCB redesign for the 8-lead PDIP footprint and verification of the addressing scheme and firmware compatibility.