Part A
AT24C02C-MAHM-T
Công nghệ Microchip
- Lifecycle
- Active
- Stock
- 2326 PCS
- Series
- Memory - Memory
Replacement verdict
Compatible functional replacement candidate
The AT24C08C-MAPD-E is a viable 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 -40 °C to +85 °C operating window, while offering a larger 8 Kbit density in place of 2 Kbit. Designers must confirm the higher memory capacity, the different I²C slave address configuration, and the alternate package and pinout before substituting in an existing layout.
Memory Density
Validation required
Supply Voltage Range
High match
Package and Pinout
Validation required
Operating Temperature Range
High match
Parts at a glance
Part B
AT24C08C-MAPD-E
Công nghệ Microchip
- Lifecycle
- Active
- Stock
- 6982 PCS
- Package
- UFDFN-8
- Series
- Memory
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 | AT24C08C-MAPD-E | Why it matters |
|---|---|---|---|
| Memory Density | 2 Kbit (256 x 8) | 8 Kbit (1024 x 8) | The total storage capacity differs by 4x, so the AT24C08C can hold more data and is not a drop-in replacement where the full 8 Kbit address space is used. |
| Organization | 256 pages x 8 bits (8-byte page) | 1024 pages x 8 bits (16-byte page) | Page size affects write buffering and firmware page-write routines; the AT24C08C uses 16-byte pages versus 8-byte pages on the AT24C02C. |
| I2C Device Address | Fixed (single address, no address pins) | Configurable via address pins (up to 4 devices on bus) | The AT24C08C allows multiple devices on the same bus through address pin strapping, while the AT24C02C occupies a single fixed address. |
| Operating Supply Voltage | 1.7 V to 5.5 V | 1.7 V to 5.5 V | Both support the same wide supply range, so voltage compatibility is not a differentiator for substitutability. |
| Maximum Clock Frequency | 1 MHz (5 V), 400 kHz (1.7 V) | 1 MHz (5 V), 400 kHz (1.7 V) | Identical bus speed ratings mean timing and throughput behavior are equivalent across both parts. |
| Package / Mounting | 8-lead UDFN (surface mount) | 8-lead TSSOP (surface mount) | Different package footprints require PCB layout changes; the parts are not physically interchangeable without a board redesign. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching industrial temperature ranges confirm both parts suit the same environmental conditions. |
| Write Cycle Endurance | 1,000,000 write cycles | 1,000,000 write cycles | Equal endurance ratings indicate comparable long-term reliability for frequent-write applications. |
| Data Retention | 100 years | 100 years | Identical retention specifications mean both are equally suitable for non-volatile storage over the product lifetime. |
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 | AT24C08C-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 | 8Kb (1K x 8) |
| Memory Interface | I2C | I²C |
| Clock Frequency | 1 MHz | 1 MHz |
| 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 AT24C08C-MAPD-E?
The AT24C02C-MAHM-T is a 2-Kbit (256 x 8) I²C serial EEPROM in a 5-lead SOT-23 package, while the AT24C08C-MAPD-E is an 8-Kbit (1024 x 8) I²C serial EEPROM in an 8-lead UDFN package. The primary differences are memory density (2 Kbit vs 8 Kbit), package type and pin count, and the resulting PCB footprint.
Are the AT24C02C-MAHM-T and AT24C08C-MAPD-E pin-compatible?
No. The AT24C02C-MAHM-T uses a 5-lead SOT-23 package, whereas the AT24C08C-MAPD-E uses an 8-lead UDFN package. The pin counts and package footprints differ, so they are not drop-in pin-compatible replacements.
What I²C interface and voltage range do these EEPROMs support?
Both devices are I²C-bus serial EEPROMs from Microchip's AT24C series. The AT24C02C-MAHM-T operates from 1.7V to 5.5V, and the AT24C08C-MAPD-E operates from 1.7V to 5.5V, supporting standard I²C communication with 2-wire interface (SDA/SCL).
How do the memory organizations of the two devices differ?
The AT24C02C-MAHM-T provides 2,048 bits organized as 256 words of 8 bits each. The AT24C08C-MAPD-E provides 8,192 bits organized as 1,024 words of 8 bits each. The larger device offers four times the storage capacity.
Do these devices support the same I²C device addressing scheme?
Both use standard 7-bit I²C addressing with the AT24C family's fixed prefix. The AT24C02C uses the address pins to select among up to eight devices on the bus, while the AT24C08C uses address pins for block selection within its larger array. Designers should verify the exact address configuration in the respective datasheets before sharing a bus.
What are the operating temperature ranges for these parts?
The AT24C02C-MAHM-T is specified for the industrial temperature range of -40°C to +85°C. The AT24C08C-MAPD-E is specified for the industrial temperature range of -40°C to +85°C. Both are suitable for industrial-grade applications.
Can the AT24C08C-MAPD-E be used as a direct substitute for the AT24C02C-MAHM-T in an existing design?
Not directly. Although both are I²C EEPROMs with compatible voltage ranges, the AT24C08C-MAPD-E has a different package (8-lead UDFN vs 5-lead SOT-23), a different pinout, and a larger memory array. A PCB redesign and firmware adjustment for the higher address space would be required.