Part A
AT24C02C-MAHM-T
微芯片科技
- Lifecycle
- Active
- Stock
- 2326 件
- Series
- 記憶-記憶
Replacement verdict
Compatible functional replacement candidate
The AT24C02C-MAHM-T and AT24C02C-MAPD-E are functionally compatible 2-Kbit I²C serial EEPROM devices from the same manufacturer family, sharing identical memory density, interface, and operating voltage range. The primary distinction lies in package and temperature grade, so the AT24C02C-MAPD-E can serve as a functional replacement candidate where the differing package footprint and operating temperature range are validated against the target design.
Memory Density & Organization
High match
Interface Type
High match
Package Type
Validation required
Operating Temperature Range
Validation required
Parts at a glance
Part B
AT24C02C-MAPD-E
微芯片科技
- Lifecycle
- Active
- Stock
- 6211 件
- Package
- UDFN-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 | AT24C02C-MAHM-T | AT24C02C-MAPD-E | Why it matters |
|---|---|---|---|
| Memory Size | 2 Kbit (256 x 8) | 2 Kbit (256 x 8) | Identical storage capacity means either device can hold the same amount of configuration or calibration data. |
| Memory Organization | 256 words x 8 bits | 256 words x 8 bits | Same byte-wide organization ensures identical addressing and data access patterns in firmware. |
| Interface Type | I2C (2-wire) | I2C (2-wire) | Both use the same two-wire I2C bus, so the host controller protocol and pin functions remain compatible. |
| Supply Voltage Range | 1.7 V to 5.5 V | 1.7 V to 5.5 V | Matching wide voltage range allows either part to operate in the same 1.8 V, 3.3 V, or 5 V systems. |
| Max Clock Frequency | 1 MHz | 1 MHz | Same maximum I2C speed means identical bus timing and throughput without firmware changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The wider temperature rating of the MAPD-E variant matters for automotive or high-temperature environments. |
| Package / Case | 8-UFDFN (2 x 3 mm) | 8-TSSOP | Different footprints require different PCB land patterns, so they are not drop-in board-level substitutes. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount, but the differing package styles still affect assembly and reflow considerations. |
| Write Cycle Time | 5 ms (max) | 5 ms (max) | Identical write cycle timing ensures the same firmware delays and polling behavior work for both parts. |
| Data Retention | 100 years | 100 years | Same long-term data retention guarantees equivalent non-volatile storage reliability. |
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 | AT24C02C-MAPD-E |
|---|---|---|
| Series | - | Automotive, AEC-Q100 |
| Part Status | Active | Active |
| Memory Type | Non-Volatile | Non-Volatile |
| Memory Format | EEPROM | EEPROM |
| Technology | EEPROM | EEPROM |
| Memory Size | 2Kbit | 2Kb (256 x 8) |
| Memory Interface | I2C | I²C |
| Clock Frequency | 1 MHz | 1 MHz |
| Write Cycle Time - Word Page | - | 5ms |
| Access Time | 550 ns | 450 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 AT24C02C-MAPD-E?
Both devices are 2-Kbit I²C-compatible serial EEPROMs from Microchip's AT24C02C family with identical 2-wire interface, 1.7V to 5.5V supply range, and 1 MHz (5V) / 400 kHz (1.7V) maximum clock frequency. The primary differences are the package type and operating temperature grade: the AT24C02C-MAHM-T is supplied in an 8-lead UDFN package rated for the industrial temperature range (-40°C to +85°C), while the AT24C02C-MAPD-E is supplied in an 8-lead PDIP package rated for the extended temperature range (-40°C to +125°C).
Are the AT24C02C-MAHM-T and AT24C02C-MAPD-E functionally interchangeable?
Functionally, both are 2-Kbit (256 x 8) I²C EEPROMs with the same memory organization, page size (8 bytes), and I²C protocol. However, they are not drop-in replacements because they use different packages (UDFN vs PDIP) and have different temperature ratings. Substitution requires verifying package footprint compatibility and confirming the target application's temperature range is covered by the selected grade.
What is the memory density and organization of these EEPROMs?
Both the AT24C02C-MAHM-T and AT24C02C-MAPD-E provide 2 Kbits of memory organized as 256 words of 8 bits each. The devices support byte write and page write modes with an 8-byte page size, and feature a self-timed write cycle with a maximum write cycle time of 5 ms.
What supply voltage range do these devices support?
Both the AT24C02C-MAHM-T and AT24C02C-MAPD-E operate from a single supply voltage of 1.7V to 5.5V, making them suitable for low-voltage and standard 3.3V/5V systems. The maximum I²C clock frequency is 1 MHz at 5V and 400 kHz at 1.7V.
What are the package and temperature grade differences between the two part numbers?
The AT24C02C-MAHM-T uses an 8-lead UDFN package and is specified for the industrial temperature range of -40°C to +85°C. The AT24C02C-MAPD-E uses an 8-lead PDIP package and is specified for the extended temperature range of -40°C to +125°C. The suffix codes in the part numbers reflect these package and temperature grade distinctions.
What is the write endurance and data retention specification for these EEPROMs?
Both the AT24C02C-MAHM-T and AT24C02C-MAPD-E are rated for a minimum of 1,000,000 write cycles and a data retention period of 100 years, per Microchip's AT24C02C datasheet. These specifications apply across the rated operating temperature range of each device.
Which device should be selected for high-temperature applications?
For applications requiring operation above +85°C, the AT24C02C-MAPD-E should be selected because it is rated for the extended temperature range of -40°C to +125°C. The AT24C02C-MAHM-T is limited to the industrial range of -40°C to +85°C and should not be used outside that range.
Do both devices support the same I²C interface and addressing scheme?
Yes. Both the AT24C02C-MAHM-T and AT24C02C-MAPD-E use the standard 2-wire I²C interface with a 7-bit device address, supporting up to eight devices on the same bus via the A0, A1, and A2 address pins. Both support random read, sequential read, byte write, and page write operations.