Microchip Technology 24AA00T-I/MC

Overview

24AA00T-I/MC from Microchip Technology Inc. is a 128-bit (16 × 8) I²C-compatible serial EEPROM designed for low-voltage embedded storage of calibration data, device IDs, and manufacturing parameters. It operates from 1.8 V to 5.5 V, draws only 500 µA typical read current and 100 nA typical standby current, and supports 100 kHz/400 kHz clock rates in industrial temperature range (–40°C to +85°C). Its 5-lead SOT-23 package enables space-constrained PCB layouts.

For engineers reviewing the 24AA00T-I/MC datasheet, 24AA00T-I/MC pinout, 24AA00T-I/MC application, or 24AA00T-I/MC equivalent, key selection criteria include ultra-low standby power, Schmitt-trigger noise immunity on SDA/SCL, self-timed write cycles (3 ms typical), 1 million erase/write endurance, and 200+ year data retention - all validated for industrial-grade reliability.

Technical Context

The 24AA00T-I/MC implements a slave-only I²C interface with fixed 4-bit device code '1010' and three don't-care address bits, enabling up to eight devices on one bus. It uses internal address pointer logic for current-address, random, and sequential read modes, and incorporates a VCC threshold detector that disables write operations below 1.5 V.

Its architecture includes Schmitt-trigger inputs and input filtering (50 ns spike suppression) to ensure robust operation on noisy buses, plus slope-controlled outputs to minimize ground bounce. The device requires no external write-enable pin and relies solely on I²C protocol-level control (START/STOP/ACK polling) for write cycle management.

Key Specifications

Pinout & Package

24AA00T-I/MC is supplied in a Pb-free, RoHS-compliant 5-lead SOT-23 package (Microchip drawing C04-028D/OT), measuring 2.90 mm × 1.60 mm × 1.30 mm. The exposed pad is not electrically connected and may be left floating or grounded per layout requirements.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with 24AA00T-I/MC, the 24LC00T-I/MC raises minimum supply voltage to 2.5 V - limiting use in modern ultra-low-power designs - while the AT24C01C offers greater memory depth at the cost of higher quiescent current and no factory-programming capability.

Availability

24AA00T-I/MC is available at Aetrix Electronics and suitable for smart sensor calibration, IoT edge device identity, and industrial PLC configuration requiring stable component supply across extended production lifecycles.

Supply support for 24AA00T-I/MC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a leading provider of microcontroller, analog, and memory solutions, with a focus on embedded control and connectivity for industrial, automotive, and consumer markets.

The 24AA00T-I/MC belongs to Microchip's legacy serial EEPROM family, engineered specifically for minimal-footprint, ultra-low-power nonvolatile storage in cost-sensitive, long-lifecycle embedded systems.

FAQ

What is the maximum I²C clock frequency supported by the 24AA00T-I/MC?

The 24AA00T-I/MC supports up to 400 kHz I²C clock frequency when VCC is 4.5 V to 5.5 V, and 100 kHz when VCC is 1.8 V to 4.5 V. These limits are defined in Table 1-2 of the DS20001178J datasheet and reflect guaranteed timing margins across the full industrial temperature range. The 24AA00T-I/MC does not support fast-mode plus (1 MHz) or high-speed mode.

Does the 24AA00T-I/MC require an external write-enable (WP) pin for hardware write protection?

No, the 24AA00T-I/MC does not include a hardware write-protect pin. Write protection is implemented exclusively through I²C protocol-level control: the device ignores write commands during internal programming cycles and responds only to valid START/ADDRESS/ACK sequences. Permanent software write-lock is not supported - all memory locations remain writable throughout the device's lifetime.

Can the 24AA00T-I/MC be used in a 1.8 V system without level shifters?

Yes, the 24AA00T-I/MC is fully specified for 1.8 V operation: its I²C interface meets timing and voltage thresholds (VIH = 0.7×VCC, VIL = 0.3×VCC) at 1.8 V, and its internal logic and EEPROM array function reliably down to this rail. No level shifting is required when interfaced with 1.8 V microcontrollers or FPGAs supporting open-drain I²C I/O.

How is the device address configured for the 24AA00T-I/MC on the I²C bus?

The 24AA00T-I/MC uses a fixed 7-bit slave address: '1010' followed by three don't-care bits (e.g., 0xA0 for write, 0xA1 for read). There are no address-select pins or external resistors - up to eight 24AA00T-I/MC devices can share one I²C bus using identical addresses, as each responds only to its own write/read sequence without arbitration.

What is the purpose of the NC pin on the 24AA00T-I/MC SOT-23 package?

Pin 4 of the 24AA00T-I/MC in 5-lead SOT-23 is designated NC (No Connect) and is not bonded internally. It must remain unconnected on the PCB - routing traces to it or applying voltage may cause parasitic coupling, increased leakage, or ESD susceptibility. The NC pin exists solely for mechanical symmetry and package compatibility with other Microchip SOT-23 variants.