Microchip Technology 24FC16HT-I/OT

Overview

24FC16HT-I/OT 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 1 MHz maximum clock frequency, 5 ms max page write time, and industrial temperature range (–40°C to +85°C). It is used for nonvolatile parameter storage in embedded controllers, sensor calibration data retention, and configuration memory in power management ICs.

For engineers reviewing the 24FC16HT-I/OT datasheet, 24FC16HT-I/OT pinout, 24FC16HT-I/OT application, or 24FC16HT-I/OT equivalent, key selection criteria include its 1 MHz I²C speed at full VCC range, hardware half-array write-protect (400h–7FFh), 16-byte page buffer, Schmitt-trigger inputs for noise immunity, and SOT-23-5 surface-mount package compatibility with space-constrained designs.

Technical Context

The 24FC16HT-I/OT implements a two-wire I²C slave interface with fixed 7-bit address prefix '1010' and three block-select bits, supporting byte and page write modes. Its internal Address Pointer auto-increments during sequential reads and wraps within 256-word blocks.

It uses an on-chip HV generator for EEPROM programming, features slope-controlled outputs to suppress ground bounce, and incorporates input filtering (≤100 ns spike suppression) and Schmitt-trigger hysteresis (≥0.05×VCC) for robust bus operation in electrically noisy environments.

Key Specifications

Pinout & Package

24FC16HT-I/OT is housed in a 5-lead SOT-23 package (JEDEC MO-178AA), with 1.6 mm × 2.8 mm footprint and 1.1 mm height. The package has no internal connection to A0/A1/A2 pins; all five terminals serve defined I/O or power functions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 24AA16HT-I/OT and AT24C16D-SSHM-T, the 24FC16HT-I/OT uniquely delivers 1 MHz I²C performance across its full 1.7V–5.5V supply range while retaining hardware half-array write protection - making it optimal for high-throughput, safety-aware embedded systems where both speed and data integrity are design-critical.

Availability

24FC16HT-I/OT is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, medical sensor calibration, and automotive body control modules requiring stable component supply, long-lifecycle support, and AEC-Q100-compliant nonvolatile memory.

Supply support for 24FC16HT-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 leading provider of microcontroller, analog, FPGA, and memory solutions, serving industrial, automotive, communications, and consumer markets with vertically integrated silicon and development tools.

The 24FC16HT-I/OT belongs to Microchip's 24XX16H family of I²C EEPROMs, designed specifically for reliable, low-power, and noise-immune configuration storage in resource-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by the 24FC16HT-I/OT?

The 24FC16HT-I/OT supports up to 1 MHz I²C clock frequency across its full 1.7V–5.5V supply range - unlike the 24AA16H (max 400 kHz) or 24LC16BH (max 400 kHz, minimum 2.5V). This enables faster parameter loading in time-sensitive applications such as real-time control loops or rapid boot sequences. The 24FC16HT-I/OT maintains this speed even at 1.7V, eliminating voltage-scaling trade-offs.

Does the 24FC16HT-I/OT require external pull-up resistors on SDA and SCL lines?

Yes, the 24FC16HT-I/OT requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. Recommended values are 2 kΩ for 1 MHz operation, 10 kΩ for 100 kHz. These resistors establish valid logic-high levels and ensure proper rise times per I²C specification. The 24FC16HT-I/OT does not integrate internal pull-ups, preserving flexibility across diverse bus capacitance and speed requirements.

How does the hardware write-protect (WP) pin function on the 24FC16HT-I/OT?

When the WP pin of the 24FC16HT-I/OT is tied to VCC, write operations to memory addresses 400h–7FFh (upper half-array) are inhibited; reads remain fully functional. When WP is tied to VSS, full read/write access is enabled. This hardware-level protection is active independently of software state and cannot be overridden - providing deterministic safeguarding of calibration or security-critical data stored in the protected region.

Is the 24FC16HT-I/OT AEC-Q100 qualified, and what grade does it meet?

Yes, the 24FC16HT-I/OT is AEC-Q100 qualified and rated for the Industrial temperature range (–40°C to +85°C), meeting Grade 2 requirements. This qualification confirms its suitability for automotive body electronics, infotainment interfaces, and other under-hood–adjacent applications where thermal stability and long-term reliability are mandated. The qualification covers stress testing for temperature cycling, HTOL, ESD, and latch-up per AEC-Q100 Rev H.

Can the 24FC16HT-I/OT be used interchangeably with the 24AA16HT-I/OT on the same PCB layout?

Yes, the 24FC16HT-I/OT and 24AA16HT-I/OT share identical SOT-23-5 packaging, pinout, and DC electrical characteristics, enabling drop-in replacement on existing layouts. However, firmware must be verified for 1 MHz I²C timing compliance, as the 24FC16HT-I/OT may expose setup/hold margin violations in designs originally validated only for 400 kHz. No PCB changes are required, but system-level timing validation is recommended.