Microchip Technology 24AA014HT-I/ST

Overview

24AA014HT-I/ST from Microchip Technology Inc. is a 1 Kbit (128 × 8) I²C-compatible serial EEPROM with industrial temperature range (−40°C to +85°C), 1.7V–5.5V supply operation, and hardware write-protection for the upper half of memory (addresses 40h–7Fh). It supports up to 400 kHz clock frequency, features Schmitt-trigger inputs and slope-controlled outputs, and delivers ≤400 μA active current and ≤1 μA standby current - enabling use in battery-powered sensor nodes and embedded control modules.

For engineers reviewing the 24AA014HT-I/ST datasheet, 24AA014HT-I/ST pinout, 24AA014HT-I/ST application, or 24AA014HT-I/ST equivalent, key selection considerations include its half-array hardware write-protect capability, 16-byte page write buffer, 1 million erase/write cycles, 200-year data retention, and compatibility with standard I²C bus timing at 1.7V minimum V_CC.

Technical Context

The 24AA014HT-I/ST implements a true I²C slave interface with fixed 4-bit control code (1010b), three programmable address bits (A2–A0), and R/W bit - supporting up to eight devices on one bus. Its internal address pointer auto-increments during sequential reads and wraps from 07Fh to 000h.

Write operations include byte-write and page-write (up to 16 bytes per cycle), both initiating self-timed internal erase/write sequences with typical 5 ms duration. Hardware write protection is controlled solely by the WP pin state (V_CC = protected, V_SS = disabled), independent of software commands.

Key Specifications

Pinout & Package

24AA014HT-I/ST is supplied in an 8-pin TSSOP package (3.0 mm × 4.4 mm, 0.65 mm pitch), RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA014HT-I/ST, the 24LC014HT-I/ST offers higher speed and temperature range at the cost of minimum supply voltage headroom, while the AT24C01D-SSHM-T trades hardware write protection for broader vendor support and identical voltage flexibility.

Availability

24AA014HT-I/ST is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, medical diagnostics, and automotive body control applications requiring stable component supply across extended product lifecycles.

Supply support for 24AA014HT-I/ST 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 24AA014H family delivers ultra-low-power, I²C-compatible EEPROMs optimized for space-constrained, battery-operated, and industrial-grade embedded systems requiring guaranteed data integrity and long-term reliability.

FAQ

What is the maximum I²C clock frequency supported by the 24AA014HT-I/ST?

The 24AA014HT-I/ST supports up to 400 kHz I²C clock frequency when V_CC is ≥1.8V. At V_CC < 1.8V (e.g., 1.7V), the maximum clock rate is limited to 100 kHz per DS22077B AC characteristics table. This ensures reliable timing margin across the full 1.7–5.5V operating range. The 24AA014HT-I/ST does not support 1 MHz operation - that capability is exclusive to the 24LC014H variant.

How does hardware write protection work on the 24AA014HT-I/ST?

Hardware write protection on the 24AA014HT-I/ST is controlled exclusively by the WP pin: when tied to V_CC, addresses 40h–7Fh (upper 64 bytes) are locked against write or erase; when tied to V_SS, all 128 bytes are writable. No software command can override this pin-driven protection. The 24AA014HT-I/ST will acknowledge write attempts to protected addresses but silently discard the data - ensuring fail-safe behavior in safety-critical systems.

Can the 24AA014HT-I/ST operate from a 1.8V supply in industrial temperature range?

Yes, the 24AA014HT-I/ST is fully specified for operation from 1.7V to 5.5V across the industrial temperature range (−40°C to +85°C). At 1.8V, it supports 400 kHz I²C communication, 400 μA max active current, and retains all functional features including page write, Schmitt-trigger inputs, and hardware write protection. This makes the 24AA014HT-I/ST ideal for dual-supply systems where 1.8V logic domains coexist with 3.3V or 5V peripherals.

What package type is used for the 24AA014HT-I/ST?

The 24AA014HT-I/ST is packaged in an 8-pin TSSOP (Thin Shrink Small Outline Package) with 3.0 mm × 4.4 mm body size and 0.65 mm lead pitch. This package is RoHS-compliant, lead-free, and compatible with standard surface-mount assembly processes. Pinout matches industry-standard 8-pin SOIC and PDIP layouts, enabling drop-in layout reuse where footprint constraints allow - though physical dimensions differ from SOIC.

Does the 24AA014HT-I/ST support sequential read across the entire 128-byte memory space?

Yes, the 24AA014HT-I/ST supports full 128-byte sequential read: after issuing a start condition and slave address with R/W=1, the device transmits data starting at the current address pointer and auto-increments for each subsequent byte, wrapping from address 07Fh back to 000h. Up to 128 bytes can be read in one transaction without address retransmission - reducing I²C bus overhead and improving throughput in configuration dump or firmware signature verification routines.