Microchip Technology 24AA01T-I/OT

Overview

24AA01T-I/OT from Microchip Technology Inc. is a 1 Kbit I²C-compatible serial EEPROM organized as 128 × 8-bit memory with hardware write-protection, 400 kHz max clock frequency at 2.5–5.5 V, and industrial temperature range (−40°C to +85°C). It operates down to 1.7 V, features 8-byte page write buffer, Schmitt-trigger inputs, and supports embedded system configuration storage in space-constrained designs.

For engineers reviewing the 24AA01T-I/OT datasheet, 24AA01T-I/OT pinout, 24AA01T-I/OT application, or 24AA01T-I/OT equivalent, this page delivers verified electrical specs, package mapping, I²C timing constraints, endurance (1M cycles), data retention (>200 years), and real-world use context for low-power, noise-immune nonvolatile memory selection.

Technical Context

The 24AA01T-I/OT implements a 2-wire I²C interface with fixed 7-bit client address (1010xxx) and R/W bit control, supporting byte and page write modes. Its internal Address Pointer auto-increments during sequential reads and wraps within 8-byte physical pages.

It uses on-chip HV generator for EEPROM programming, includes Schmitt-trigger inputs and output slope control to suppress ground bounce and bus noise, and relies on acknowledge polling-not timeout-to detect write cycle completion.

Key Specifications

Pinout & Package

24AA01T-I/OT is supplied in SOT-23-5 package (JEDEC MO-178AA), measuring 2.9 mm × 1.6 mm × 1.1 mm, with gull-wing leads and exposed pad optional for thermal relief. Pin 1 = SCL, Pin 2 = V_SS, Pin 3 = SDA, Pin 4 = WP, Pin 5 = V_CC. A0–A2 pins are not internally connected and may be left floating or tied to V_SS/V_CC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC01B-I/OT, the 24AA01T-I/OT enables lower-voltage operation critical for energy-efficient designs, while AT24C01D-SSHM-T offers higher bandwidth at the cost of footprint and compatibility-making 24AA01T-I/OT optimal for compact, battery-sensitive applications requiring guaranteed 1.7 V functionality.

Availability

24AA01T-I/OT is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply, long-life data retention, and AEC-Q100-aligned reliability.

Supply support for 24AA01T-I/OT 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.

The 24AA01T-I/OT belongs to Microchip's 24XX01 family of serial EEPROMs, designed specifically for reliable, low-power nonvolatile storage in space- and power-constrained embedded systems across industrial, medical, and automotive markets.

FAQ

What is the maximum I²C clock frequency supported by the 24AA01T-I/OT?

The 24AA01T-I/OT supports up to 400 kHz at V_CC ≥ 2.5 V. When operating below 2.5 V (down to 1.7 V), the maximum clock frequency is reduced to 100 kHz per DS20001711M specification. This ensures reliable timing margin under low-voltage conditions. The 24AA01T-I/OT does not support 1 MHz operation-that capability is reserved for the 24FC01 variant.

How does the hardware write-protect (WP) pin function on the 24AA01T-I/OT?

When the WP pin of the 24AA01T-I/OT is tied to V_CC, all write operations-including byte and page writes-are inhibited across the full memory array (addresses 00h–7Fh); read operations remain fully functional. Tying WP to V_SS enables normal read/write access. No internal pull-up/down is present, so external biasing is mandatory for deterministic behavior.

Can the 24AA01T-I/OT be used in automotive applications?

Yes-the 24AA01T-I/OT is AEC-Q100 qualified for automotive use and rated for the industrial temperature range (−40°C to +85°C). While not explicitly qualified for extended temperature (−40°C to +125°C), its AEC-Q100 qualification confirms robustness against vibration, thermal cycling, and ESD-making it suitable for cabin and body-control applications where ambient temperatures stay within I-temp limits.

What is the purpose of the A0, A1, and A2 pins on the 24AA01T-I/OT?

The A0, A1, and A2 pins on the 24AA01T-I/OT are not internally connected and serve no functional role. They may be left floating, tied to V_SS, or tied to V_CC without affecting device operation. This differs from higher-density EEPROMs (e.g., 24AA02) where these pins encode I²C slave addresses-here, the 24AA01T-I/OT uses a fixed 7-bit address (1010xxx) with "don't care" bits.

How many write/erase cycles can the 24AA01T-I/OT endure before failure?

The 24AA01T-I/OT guarantees a minimum of 1,000,000 write/erase cycles per memory location at 25°C and 5.5 V, as specified in Table 1-2 of DS20001711M. This endurance applies to both byte and page write modes. Field reliability remains high even beyond this spec-Microchip characterizes data retention exceeding 200 years post-last-write under nominal conditions.