Microchip Technology AT24C01C-XHM-T

Overview

AT24C01C-XHM-T from Microchip Technology is a 1-Kbit I²C-compatible serial EEPROM organized as 128 × 8 bits, operating from 1.7V to 5.5V with industrial temperature range (−40°C to +85°C), 100/400 kHz I²C interface, and hardware write-protection via WP pin - used for configuration storage in embedded microcontroller systems.

For engineers reviewing the AT24C01C-XHM-T datasheet, AT24C01C-XHM-T pinout, AT24C01C-XHM-T application, or AT24C01C-XHM-T equivalent, key selection criteria include low-voltage operation, page-write capability, endurance (1M cycles), data retention (100 years), and compatibility with multi-device I²C bus topologies using A0–A2 address inputs.

Technical Context

The AT24C01C-XHM-T implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and open-drain bidirectional data transfer. It supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz at ≥2.5V) timing modes with strict tLOW/tHIGH and spike suppression requirements.

Internally, it uses an 8-byte page architecture with self-timed write cycles ≤5 ms, hardware write protection via dedicated WP pin, and internal pull-downs on A0/A1/A2 pins enabling up to eight devices per bus. Power-on reset ensures reliable initialization across 1.7–5.5V supply ramp rates ≤0.1 V/µs.

Key Specifications

Pinout & Package

AT24C01C-XHM-T is supplied in an 8-lead TSSOP package (3.0 mm × 4.4 mm, 0.65 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-XHM-T, the AT24C01D-XHM-T offers improved ESD tolerance and tighter AC parameters for next-gen industrial designs, while M24C01-RMN6TP provides 1.8V-compatible FM+ but requires external biasing - making AT24C01C-XHM-T optimal for cost-sensitive, drop-in-replacement scenarios with minimal layout change.

Availability

AT24C01C-XHM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, consumer device configuration, medical diagnostic logging, automotive body control modules, and embedded microcontroller boot configuration requiring stable component supply and long-term lifecycle support.

Supply support for AT24C01C-XHM-T 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 leading provider of microcontrollers, analog components, and memory solutions, serving industrial, automotive, and communications markets with vertically integrated silicon and software platforms.

The AT24C01C-XHM-T belongs to Microchip's legacy AT24Cxx serial EEPROM family, designed specifically for low-power, multi-voltage I²C configuration storage in space-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by AT24C01C-XHM-T?

The AT24C01C-XHM-T supports 100 kHz (Standard mode), 400 kHz (Fast mode), and 1 MHz (Fast Mode Plus) - but FM+ operation requires VCC ≥2.5V. At 1.7–2.5V, only Standard and Fast modes are guaranteed. This voltage-dependent speed scaling allows designers to optimize noise immunity versus throughput based on system rail constraints. The AT24C01C-XHM-T datasheet specifies tLOW/tHIGH minima of 500 ns for FM+ timing compliance.

Does AT24C01C-XHM-T require external pull-up resistors on SDA and SCL lines?

Yes, AT24C01C-XHM-T requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Recommended values are ≤10 kΩ for SDA and ≤4 kΩ for SCL at 400 kHz, scaling down to 1.3 kΩ for 1 MHz FM+ operation. The AT24C01C-XHM-T internal circuitry does not provide active pull-ups, and omitting external resistors will prevent bus communication entirely.

How does the write-protect (WP) pin function on AT24C01C-XHM-T?

When the WP pin of AT24C01C-XHM-T is driven high (≥0.7×VCC), all write operations to the entire memory array are inhibited - including byte, page, and sequential writes. When WP is low or floating, writes are enabled. Internally, WP is pulled down, but Microchip recommends hard-wiring it to GND or VCC to avoid noise-induced glitches. This hardware-level protection operates independently of I²C commands and cannot be overridden in software.

What is the memory organization of AT24C01C-XHM-T?

The AT24C01C-XHM-T is organized as 128 words × 8 bits (1,024 total bits), arranged in 16 pages of 8 bytes each. This structure enables efficient page-write operations: up to 8 bytes can be written in a single cycle with automatic address incrementing. The word address is 7-bit, limiting direct addressing to 0x00–0x7F. During sequential reads, the internal address counter wraps from 0x7F back to 0x00, supporting continuous streaming without host-side address management.

Can AT24C01C-XHM-T operate reliably at 1.7V supply voltage?

Yes, AT24C01C-XHM-T is fully specified for operation at 1.7V, including DC parameters (ICC1 ≤1.0 mA read current, ISB ≤1.0 μA standby), AC timing (tLOW ≥1200 ns at 100 kHz), and I²C functionality (100/400 kHz modes). Its 1.7V minimum VCC enables direct integration with 1.8V microcontrollers and ultra-low-power systems. However, FM+ (1 MHz) mode is disabled below 2.5V, and write cycle time remains ≤5 ms across the full 1.7–5.5V range - confirmed in Microchip's DS20006111A datasheet Section 4.2 and 4.4.