Microchip Technology 24AA16HT-I/MS

Overview

24AA16HT-I/MS from Microchip Technology Inc. is a 16-Kbit I²C-compatible serial EEPROM organized as eight 256 × 8-bit blocks, operating from 1.7V to 5.5V with 400 kHz max clock frequency, 1 μA standby current, and hardware write-protect for the upper half-array (400h–7FFh). It is used in industrial sensor calibration storage and embedded system configuration retention.

For engineers reviewing the 24AA16HT-I/MS datasheet, 24AA16HT-I/MS pinout, 24AA16HT-I/MS application, or 24AA16HT-I/MS equivalent, key selection criteria include low-voltage operation down to 1.7V, I²C timing compliance at 400 kHz (and 100 kHz below 2.5V), MSOP-8 package footprint, half-array hardware write-protection, and AEC-Q100 qualification for extended temperature reliability.

Technical Context

The 24AA16HT-I/MS implements a two-wire I²C slave interface with Schmitt-trigger inputs and slope-controlled outputs to suppress noise and eliminate ground bounce. Its internal architecture includes an 8-bit address pointer, 16-byte page write buffer, and HV generator for EEPROM programming.

It supports byte and page write operations with self-timed erase/write cycles (≤5 ms), acknowledge polling for bus efficiency, and hardware-based write protection via the WP pin-active high to lock addresses 400h–7FFh while permitting full read access across the 16-Kbit array.

Key Specifications

Pinout & Package

24AA16HT-I/MS is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm × 1.0 mm body height), with gull-wing leads and exposed pad optional for thermal relief. Pin 1 is marked by a beveled corner or dot; A0–A2 are no-connects and may be left floating or tied to VSS/VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24LC16BHT-I/MS, the 24AA16HT-I/MS enables lower-voltage operation critical for modern ultra-low-power designs; compared with 24AA16T-I/SN, it offers 27% smaller board area while maintaining identical functional behavior and industrial temperature support.

Availability

24AA16HT-I/MS is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded configuration storage, and automotive subsystem logging requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 24AA16HT-I/MS 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 microcontrollers, analog devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.

The 24AA16HT-I/MS belongs to Microchip's 24XX16H family of I²C EEPROMs, engineered for robust, low-power nonvolatile storage in space-constrained industrial and automotive applications where voltage flexibility and data integrity are critical.

FAQ

What is the maximum I²C clock frequency supported by the 24AA16HT-I/MS?

The 24AA16HT-I/MS supports up to 400 kHz when VCC is ≥2.5V, and 100 kHz when VCC is between 1.7V and 2.49V. This dual-speed capability ensures interoperability with both standard-mode and fast-mode I²C masters across its full operating voltage range, and is explicitly defined in Microchip's DS20002118B datasheet Section 1.2 (AC Characteristics).

Does the 24AA16HT-I/MS require external pull-up resistors on SDA and SCL lines?

Yes, the 24AA16HT-I/MS requires external pull-up resistors on both SDA and SCL because its I²C interface uses open-drain outputs. A 2 kΩ resistor is recommended for 400 kHz operation; 10 kΩ is sufficient for 100 kHz. These values ensure proper rise times per I²C specification and prevent bus contention, as detailed in Section 2.2 of the DS20002118B datasheet.

How does hardware write-protection work on the 24AA16HT-I/MS?

When the WP pin of the 24AA16HT-I/MS is tied to VCC, write operations to memory addresses 400h–7FFh (upper 8 Kbit) are inhibited; reads remain fully functional. When WP is tied to VSS, full read/write access is enabled. This feature is implemented entirely in hardware and requires no software configuration, as confirmed in Section 2.4 and Figure 6-3 of DS20002118B.

Is the 24AA16HT-I/MS AEC-Q100 qualified?

Yes, the 24AA16HT-I/MS is AEC-Q100 qualified for automotive applications, as stated in the "Features" section of DS20002118B. This qualification covers stress testing for temperature cycling, humidity, and electrical reliability, supporting use in body electronics and subsystems where automotive-grade reliability is mandated.

What is the page size and maximum page write length for the 24AA16HT-I/MS?

The 24AA16HT-I/MS has a 16-byte page buffer and enforces strict page boundaries: writes crossing a 16-byte boundary (e.g., starting at address 0xFF and writing 2 bytes) wrap around within the same page instead of advancing to the next. This behavior is documented in Section 6.2 and Figure 6-2 of DS20002118B and must be managed in firmware to avoid unintended data overwrite.