Microchip Technology AT24C01D-MAHM-E

Overview

AT24C01D-MAHM-E 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), 1 MHz Fast Mode Plus support at 2.5–3.6V, and hardware write-protection via WP pin - used for nonvolatile parameter storage in embedded microcontroller systems.

For engineers reviewing the AT24C01D-MAHM-E datasheet, AT24C01D-MAHM-E pinout, AT24C01D-MAHM-E application, or AT24C01D-MAHM-E equivalent, key selection factors include I²C bus voltage compatibility (1.7–3.6V), page-write capability (8-byte pages), ultra-low standby current (≤0.8 μA), and hardware address pin configuration (A0–A2) for multi-device bus topology.

Technical Context

The AT24C01D-MAHM-E functions as an I²C slave device with fixed 7-bit device address prefix 1010b and three programmable hardware address bits (A0–A2), enabling up to eight devices on one bus. It implements Schmitt-triggered, filtered SDA/SCL inputs for noise immunity and supports standard (100 kHz), fast (400 kHz), and fast-mode plus (1 MHz) I²C timing.

Internally, it uses a high-voltage generation circuit for EEPROM programming, power-on reset (POR) with 1.5 V threshold and 100 µs power-up delay, and automatic internal write-cycle timing (≤5 ms). The memory array is structured as 16 pages of 8 bytes each, supporting both random and sequential read modes with ACK/NACK protocol compliance.

Key Specifications

Pinout & Package

AT24C01D-MAHM-E is housed in an 8-pad UDFN package (2.0 mm × 1.6 mm, 0.5 mm pitch) with wettable flank leads for automated optical inspection. The exposed pad is optional and may be connected to GND or left floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01D-MAHM-E, the AT24C01C-SSHM-T offers wider voltage tolerance at the cost of size and speed, while the M24C01-RMN6TP delivers matching FM+ performance with minor firmware adaptation - both serve as validated drop-in alternatives in space-constrained, low-voltage embedded systems.

Availability

AT24C01D-MAHM-E is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter firmware storage, and medical device configuration requiring stable component supply, long-term obsolescence management, and RoHS-compliant green packaging.

Supply support for AT24C01D-MAHM-E 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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified quality systems and broad industrial design-in support.

The AT24CxxD series targets low-voltage, low-power embedded systems needing reliable nonvolatile storage - optimized for I²C bus efficiency, noise immunity, and extended data retention in harsh environments.

FAQ

What is the maximum I²C clock frequency supported by AT24C01D-MAHM-E?

The AT24C01D-MAHM-E supports 100 kHz (Standard Mode), 400 kHz (Fast Mode), and 1 MHz (Fast Mode Plus) I²C clock frequencies. FM+ operation requires VCC ≥2.5 V; below that, maximum speed is 400 kHz. All modes maintain full AC timing compliance per DS20006100A, including tLOW, tHIGH, and tR specifications.

Does AT24C01D-MAHM-E require external pull-up resistors on SDA and SCL lines?

Yes, AT24C01D-MAHM-E requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is a CMOS input. Recommended values are ≤10 kΩ for SDA (based on bus capacitance and speed), and a similar resistor for SCL if not actively driven. Values must be selected per I²C bus specs: e.g., 4 kΩ for 400 kHz, 1.3 kΩ for 1 MHz.

How does the Write-Protect (WP) pin function on AT24C01D-MAHM-E?

When WP is tied to VCC, AT24C01D-MAHM-E inhibits all write operations to its entire memory array; when grounded, normal writes are permitted. If left floating, WP is internally pulled down to GND, enabling writes - but Microchip recommends hardwiring WP to avoid noise-induced glitches. This hardware lock provides deterministic protection independent of firmware state.

What is the memory organization of AT24C01D-MAHM-E?

AT24C01D-MAHM-E contains 1,024 bits organized as 128 words of 8 bits each, arranged in 16 pages of 8 bytes. This structure enables efficient page-write operations (up to 8 bytes per write cycle) and supports both random and sequential read access. The device uses a 7-bit I²C address with three hardware-configurable bits (A0–A2) for multi-device bus addressing.

Is AT24C01D-MAHM-E compatible with 1.8 V microcontroller I/O levels?

Yes, AT24C01D-MAHM-E is fully compatible with 1.8 V microcontrollers: its VCC range (1.7–3.6 V) includes 1.8 V, and its input thresholds (VIL ≤0.3×VCC, VIH ≥0.7×VCC) ensure reliable logic recognition. At 1.8 V, VIH ≥1.26 V and VIL ≤0.54 V - well within typical 1.8 V GPIO output specs. SDA/SCL rise/fall times also meet I²C AC requirements at this voltage.