Part A
24AA025UIDT-I/OT
Tecnologia Microchip
- Lifecycle
- Active
- Stock
- 3962 PCS
- Package
- SOT-23-6
- Series
- Memória
Replacement verdict
Compatible functional replacement candidate
The 24AA025UIDT-I/OT is a functional replacement candidate for the 24AA02UIDT-I/OT, sharing the same I²C serial EEPROM architecture, unique ID functionality, SOT-23-5 package, and 1.7V–5.5V operating range. The primary distinction is memory density, with the 24AA025 offering 2 Kbit versus 1 Kbit, which may require firmware or address map validation depending on the application.
Memory Density
High match
Package Type
High match
Supply Voltage Range
High match
Interface Type
High match
Parts at a glance
Part B
24AA02UIDT-I/OT
Tecnologia Microchip
- Lifecycle
- Active
- Stock
- 4080 PCS
- Package
- SOT-23-5
- Series
- Memória
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | 24AA02UIDT-I/OT | 24AA025UIDT-I/OT | Why it matters |
|---|---|---|---|
| Memory Size | 2 Kbit | 2 Kbit | Total EEPROM density determines how much data can be stored; both devices offer the same 2 Kbit array. |
| Memory Organization | 256 x 8 | 256 x 8 | Byte-wide organization affects addressing and access patterns; identical organization means software compatibility. |
| Unique ID Length | 128-bit | 128-bit | The factory-programmed unique ID is used for authentication and identification; both provide the same 128-bit ID. |
| Interface Type | I2C (2-wire) | I2C (2-wire) | The serial protocol determines host compatibility; both use standard I2C, allowing drop-in replacement. |
| Operating Voltage Range | 1.7 V to 5.5 V | 1.7 V to 5.5 V | Supply range must match the system rail; identical ranges ensure both work in the same low-voltage designs. |
| Maximum Clock Frequency | 400 kHz | 400 kHz | Bus speed affects read/write timing; identical 400 kHz support means no firmware timing changes are needed. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Temperature grade determines suitability for industrial vs. commercial environments; both are industrial-grade. |
| Package / Mounting | SOT-23-5, Surface Mount | SOT-23-5, Surface Mount | Footprint and mounting style must match the PCB layout; identical packages allow direct board replacement. |
| Write Protection | Software write protection | Software write protection | Protection mechanism prevents accidental data corruption; both use the same software-based scheme. |
| Supply Current (Read, typical) | 1 mA | 1 mA | Active current draw impacts power budget; identical typical read current means equivalent power consumption. |
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 | 24AA025UIDT-I/OT | 24AA02UIDT-I/OT |
|---|---|---|
| Part Status | Active | Active |
| Memory Type | Non-Volatile | Non-Volatile |
| Memory Format | EEPROM | EEPROM |
| Technology | EEPROM | EEPROM |
| Memory Size | 2Kb (128 x 8 x 2) | 2Kb (128 x 8 x 2) |
| 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 ~ 5.5V | 1.7V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the 24AA02UIDT-I/OT and the 24AA025UIDT-I/OT?
The primary difference is the memory density: the 24AA02UIDT-I/OT provides 2 Kbit of serial EEPROM, while the 24AA025UIDT-I/OT provides 2.5 Kbit. Both devices include a factory-programmed 128-bit unique ID (UID) and are offered in the same SOT-23-5 package.
Are the 24AA02UIDT-I/OT and 24AA025UIDT-I/OT pin-to-pin compatible?
Yes. Both devices are specified in the 5-lead SOT-23 package with the same pinout: SDA, SCL, VCC, VSS, and a dedicated UID/output pin. This allows a common PCB footprint, but firmware must account for the different memory sizes.
What is the operating voltage range for these devices?
Both the 24AA02UIDT-I/OT and 24AA025UIDT-I/OT operate from 1.7 V to 5.5 V, supporting low-voltage and standard 5 V systems.
Do both devices support the same I2C interface speed?
Yes. Both devices support the I2C serial interface at up to 400 kHz (Fast mode) over the full 1.7 V to 5.5 V range.
What is the purpose of the unique ID (UID) in these devices?
Each device contains a factory-programmed, 128-bit unique ID that is read-only and cannot be altered. It is typically used for authentication, anti-counterfeiting, device identification, or deriving unique keys in embedded systems.
What are the operating temperature ranges for the 24AA02UIDT-I/OT and 24AA025UIDT-I/OT?
Both devices are specified for the industrial temperature range of -40 °C to +85 °C, as indicated by the "I" suffix in the part number.
Can the 24AA02UIDT-I/OT be used as a drop-in replacement for the 24AA025UIDT-I/OT?
Not directly. Although they share the same package and pinout, the 24AA025UIDT-I/OT has a larger memory array (2.5 Kbit vs. 2 Kbit). Firmware that addresses the full 2.5 Kbit range of the 24AA025UIDT-I/OT will not be compatible with the 2 Kbit 24AA02UIDT-I/OT without modification.
What is the typical write endurance and data retention for these EEPROM devices?
Both devices are rated for a minimum of 1,000,000 write cycles and a data retention of greater than 200 years, per Microchip's datasheet specifications.