Microchip Technology 24AA128T-I/MNY

Overview

24AA128T-I/MNY from Microchip Technology Inc. is a 128 Kbit (16K × 8) I²C-compatible serial EEPROM with 1.7V–5.5V single-supply operation, 400 kHz max clock frequency, and industrial temperature range (–40°C to +85°C). It features 64-byte page write buffer, hardware write-protection via WP pin, and Schmitt-trigger inputs for noise immunity - deployed in embedded sensor calibration storage and industrial control configuration memory.

For engineers reviewing the 24AA128T-I/MNY datasheet, 24AA128T-I/MNY pinout, 24AA128T-I/MNY application, or 24AA128T-I/MNY equivalent, this page delivers verified package mapping (8-lead TDFN), exact I²C timing compliance (400 kHz @ VCC ≥ 2.5V), endurance (1M cycles), data retention (>200 years), and validated alternative part selection guidance.

Technical Context

The 24AA128T-I/MNY implements a two-wire I²C slave interface with fixed 4-bit control code (1010b) and user-configurable 3-bit chip address (A2–A0), enabling up to eight devices on one bus. Its internal architecture includes a 64-byte page latch, HV generator for EEPROM programming, and address pointer logic supporting random, current-address, and sequential reads across the full 128Kbit array.

Write operations are self-timed with maximum 5 ms byte/page cycle time; acknowledge polling is supported to detect completion. The device uses open-drain SDA/SCL with external pull-ups and incorporates slope control and Schmitt-trigger inputs to suppress ground bounce and noise spikes - critical for reliable operation in electrically noisy industrial environments.

Key Specifications

Pinout & Package

24AA128T-I/MNY is packaged in an 8-lead TDFN (Thin Dual Flat No-lead) with exposed pad, measuring 2 mm × 3 mm × 0.75 mm (MSL3, reflow compatible). Pin 1 is marked by chamfered corner; exposed pad may be connected to VSS or left floating per design requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC128-I/MNY and AT24C128-10PU-2.7, the 24AA128T-I/MNY uniquely supports 1.7V operation and AEC-Q100 qualification while maintaining 400 kHz speed - making it the only choice for automotive and ultra-low-power industrial designs requiring full feature parity.

Availability

24AA128T-I/MNY is available at Aetrix Electronics and suitable for industrial sensor calibration storage, medical device configuration memory, and automotive body control modules requiring stable component supply, long-term obsolescence planning, and RoHS-compliant sourcing.

Supply support for 24AA128T-I/MNY 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, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 24AA128T-I/MNY belongs to Microchip's 24XX128 family of I²C EEPROMs, engineered specifically for robust, low-power, and long-life nonvolatile data storage in automotive, industrial, and medical applications demanding AEC-Q100 qualification and extended voltage range.

FAQ

What is the minimum operating voltage for the 24AA128T-I/MNY?

The 24AA128T-I/MNY operates down to 1.7V, enabling direct interface with 1.8V logic families and battery-powered systems experiencing brown-out conditions. This is confirmed in the Device Selection Table and Electrical Characteristics section of DS20001191T, where VCC range is explicitly specified as 1.7V–5.5V for the 24AA128 variant. Operation below 1.7V is not guaranteed.

Does the 24AA128T-I/MNY support 1 MHz I²C clock speed?

No, the 24AA128T-I/MNY supports up to 400 kHz I²C clock frequency at VCC ≥ 2.5V and 100 kHz below 2.5V. The 1 MHz capability is exclusive to the 24FC128 variant per the Device Selection Table. Attempting 1 MHz operation on the 24AA128T-I/MNY will violate AC timing specifications and result in communication failure.

How many devices can be connected on the same I²C bus using the 24AA128T-I/MNY?

Up to eight 24AA128T-I/MNY devices can share one I²C bus using unique combinations of A0, A1, and A2 pins (3-bit chip address). Each device must have a distinct A2:A1:A0 state (e.g., 000, 001, ..., 111). The TDFN package used in 24AA128T-I/MNY fully supports all three address pins - unlike MSOP variants where A0/A1 are NC.

What is the function of the WP pin on the 24AA128T-I/MNY?

The WP (Write-Protect) pin on the 24AA128T-I/MNY disables all write operations when held high (tied to VCC), while allowing unrestricted read access. It is sampled only at the Stop condition edge of each write command, ensuring protection remains active even if WP toggles mid-transfer. This provides hardware-level safeguard against accidental firmware or configuration corruption.

Is the 24AA128T-I/MNY AEC-Q100 qualified?

Yes, the 24AA128T-I/MNY is AEC-Q100 qualified for automotive applications. The "I" in the part number denotes Industrial temperature grade (–40°C to +85°C), and the datasheet explicitly states "Automotive AEC-Q100 Qualified" under Features. This qualification covers stress testing for temperature cycling, humidity, and electrical robustness required for under-hood and cabin electronics.