Microchip Technology AT24C01D-XHM-B

Overview

AT24C01D-XHM-B from Microchip Technology is a 1-Kbit I²C-compatible serial EEPROM organized as 128 × 8 bits, operating from 1.7V to 3.6V with industrial temperature range (−40°C to +85°C), 100/400 kHz I²C standard/fast mode support, and hardware write-protection via WP pin - used for configuration storage in embedded microcontroller systems.

For engineers reviewing the AT24C01D-XHM-B datasheet, AT24C01D-XHM-B pinout, AT24C01D-XHM-B application, or AT24C01D-XHM-B equivalent, key selection criteria include low-voltage operation, page-write capability (8-byte pages), ultra-low standby current (≤0.8 μA), Schmitt-triggered noise-immune inputs, and compatibility with multi-device I²C bus topologies using A0–A2 address pins.

Technical Context

The AT24C01D-XHM-B functions as an I²C slave device with fixed 7-bit device address prefix 1010b and three programmable address bits (A0–A2), enabling up to eight devices on one bus. It implements internal high-voltage generation for EEPROM writes and uses Power-on Reset (POR) with 100 µs tPUP delay after stable VCC.

Communication follows strict I²C timing: data latched on SCL rising edge, output on falling edge; supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz at ≥2.5V); includes integrated spike suppression filters and Schmitt triggers on SDA/SCL for robust noise immunity in noisy industrial environments.

Key Specifications

Pinout & Package

AT24C01D-XHM-B is supplied in an 8-lead SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), RoHS-compliant and halide-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01C-SSHM-T, AT24C01D-XHM-B adds guaranteed −40°C to +85°C operation and tighter low-voltage performance; versus M24C01-RMN6TP, it trades broader VCC range for integrated hardware write protection and lower standby current (0.8 μA vs typical 1.5 μA).

Availability

AT24C01D-XHM-B is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration, and automotive body control module designs requiring stable component supply, long-term data retention, and guaranteed industrial temperature performance.

Supply support for AT24C01D-XHM-B 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 is a U.S.-based semiconductor company specializing in microcontrollers, analog, FPGA, and memory solutions, with ISO 9001-certified manufacturing and global distribution.

The AT24C01D-XHM-B belongs to Microchip's AT24CxxD family of I²C serial EEPROMs, designed specifically for reliable, low-power nonvolatile storage in space-constrained industrial and automotive systems.

FAQ

What is the maximum I²C clock frequency supported by the AT24C01D-XHM-B?

The AT24C01D-XHM-B supports 100 kHz (Standard Mode) and 400 kHz (Fast Mode) across its full 1.7V–3.6V supply range, and 1 MHz (Fast Mode Plus) when VCC is ≥2.5V. This enables flexible bus speed selection based on system voltage and noise environment - critical for optimizing communication latency while maintaining signal integrity in mixed-voltage designs.

Does the AT24C01D-XHM-B require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C01D-XHM-B requires external pull-up resistors on both SDA and SCL lines because SDA is open-drain and SCL is input-only. Microchip specifies maximum pull-up resistance of 10 kΩ; typical values are 4.7 kΩ for 400 kHz and 1.3 kΩ for 1 MHz operation. Failure to install appropriate pull-ups will prevent I²C communication and cause bus lockup.

How does the Write-Protect (WP) pin function on the AT24C01D-XHM-B?

The WP pin on the AT24C01D-XHM-B is an active-high hardware lock: when tied to VCC, it inhibits all write operations to the entire memory array; when tied to GND, normal read/write access is enabled. If left floating, it defaults to GND via internal pull-down, but Microchip recommends hard-wiring WP to avoid noise-induced glitches - a key reliability feature absent in many competing EEPROMs.

What is the memory organization of the AT24C01D-XHM-B?

The AT24C01D-XHM-B contains 1,024 bits organized as 128 words of 8 bits each, grouped into 16 pages of 8 bytes. This page structure enables efficient 1–8 byte writes without erasing adjacent data - essential for updating configuration registers or logging small data packets while preserving memory endurance and minimizing bus traffic.

Is the AT24C01D-XHM-B compatible with other AT24Cxx devices on the same I²C bus?

Yes, the AT24C01D-XHM-B uses the standard I²C device address prefix 1010b and supports hardware address bits A0–A2, allowing up to eight AT24Cxx devices (including AT24C02D, AT24C04D, etc.) to coexist on one bus. Address collision is avoided by unique A0–A2 pin configurations - a core design feature enabling scalable system-level memory expansion without protocol changes.