Microchip Technology 24AA128T-E/ST16KVAO

Overview

24AA128T-E/ST16KVAO 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-used in embedded system configuration storage, sensor calibration data retention, and firmware parameter backup.

For engineers reviewing the 24AA128T-E/ST16KVAO datasheet, 24AA128T-E/ST16KVAO pinout, 24AA128T-E/ST16KVAO application, or 24AA128T-E/ST16KVAO equivalent, this page delivers verified electrical specs, package mapping to 8-lead SOIC (ST), pin-level circuit roles, real-world use scenarios, and two validated alternative parts with documented functional and application differences.

Technical Context

The 24AA128T-E/ST16KVAO implements a two-wire I²C interface with slave address decoding using A0–A2 pins, supporting up to eight devices on one bus. Its internal architecture includes a 64-byte page latch, HV generator for EEPROM programming, and memory control logic enabling self-timed erase/write cycles.

It supports byte and page write modes, random/sequential reads across full 128K boundary, and acknowledge polling for write-cycle completion detection. Write protection is hardware-enforced via dedicated WP pin sampled at Stop condition, and all I/O pins feature Schmitt-trigger inputs with 50 ns spike suppression and controlled output slope to minimize ground bounce.

Key Specifications

Pinout & Package

24AA128T-E/ST16KVAO is packaged in an 8-lead SOIC (ST) per Microchip drawing C04-057-SN, with 3.90 mm body width, gull-wing leads, and RoHS-compliant matte tin finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC128-I/P, the 24AA128T-E/ST16KVAO adds 1.7V operation and AEC-Q100 qualification; compared with AT24C128-10PU-2.7, it trades maximum speed for broader voltage support, higher endurance, and automotive reliability assurance.

Availability

24AA128T-E/ST16KVAO is available at Aetrix Electronics and suitable for industrial sensor calibration storage, medical device configuration backup, and automotive body control module settings requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 24AA128T-E/ST16KVAO 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, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and development tools.

The 24AA128T-E/ST16KVAO belongs to Microchip's 24XX128 family of I²C EEPROMs, designed specifically for robust, low-power nonvolatile data storage in resource-constrained embedded systems requiring guaranteed data integrity and long-term reliability.

FAQ

What is the operating voltage range of the 24AA128T-E/ST16KVAO?

The 24AA128T-E/ST16KVAO operates from 1.7V to 5.5V, enabling direct compatibility with 1.8V, 3.3V, and 5V logic systems. This wide V_CC range is confirmed in the Device Selection Table and Electrical Characteristics section of DS20001191T, where 1.7V minimum is explicitly specified for the 24AA128 variant. The 24AA128T-E/ST16KVAO maintains full I²C functionality-including 400 kHz clock support-at all voltages within this range.

Does the 24AA128T-E/ST16KVAO support AEC-Q100 qualification?

Yes, the 24AA128T-E/ST16KVAO is AEC-Q100 qualified for automotive applications. The "E" in the part number denotes the automotive temperature grade (−40°C to +125°C), and the datasheet states "Automotive AEC-Q100 Qualified" under Features. This qualification covers stress testing for temperature cycling, humidity, ESD, and other automotive-relevant reliability metrics, making the 24AA128T-E/ST16KVAO suitable for body control modules and infotainment subsystems.

How many devices can be connected on the same I²C bus using the 24AA128T-E/ST16KVAO?

Up to eight 24AA128T-E/ST16KVAO devices can be connected on a single I²C bus using the A0, A1, and A2 address pins. These three pins form the slave address bits, allowing 2³ = 8 unique 7-bit addresses (1010xxx binary). The datasheet confirms this in the Device Selection Table and Section 2.1, noting that "Up to eight devices may be connected to the same bus by using different Chip Select bit combinations."

What is the maximum page write size for the 24AA128T-E/ST16KVAO?

The 24AA128T-E/ST16KVAO supports a maximum page write size of 64 bytes, as stated in the Features list and Section 6.2. This is implemented via an on-chip 64-byte page buffer: the host transmits up to 64 bytes after the address, and the device writes them atomically upon receiving the Stop condition. Attempting to write more than 64 bytes in one transaction causes address wraparound within the same physical page, per Figure 6-1 and associated notes.

Is hardware write protection available on the 24AA128T-E/ST16KVAO?

Yes, the 24AA128T-E/ST16KVAO includes a dedicated hardware write-protect (WP) pin. When WP is tied to VCC, all write operations-including byte and page writes-are inhibited while read operations remain fully functional. The WP state is sampled at the Stop condition of each write command, as detailed in Section 6.3 and Figure 1-1, providing deterministic, pin-level control over memory integrity.