Microchip Technology AT24C32D-MAHM-E

Overview

AT24C32D-MAHM-E from Microchip Technology is a 32-Kbit I²C-compatible serial EEPROM organized as 4,096 × 8 bits, operating from 1.7V to 5.5V across -40°C to +85°C, with hardware write protection (WP), 32-byte page write capability, and 1 MHz Fast Mode Plus support at 2.5–5.5V - deployed in industrial sensor calibration, embedded configuration storage, and power-management parameter retention.

For engineers reviewing the AT24C32D-MAHM-E datasheet, AT24C32D-MAHM-E pinout, AT24C32D-MAHM-E application, or AT24C32D-MAHM-E equivalent, key selection considerations include VCC voltage range compatibility, WP pin functionality for hardware data lock, I²C bus timing compliance (100/400 kHz standard/fast mode and 1 MHz FM+), page write latency (≤5 ms), and industrial-grade reliability (1M write cycles, 100-year data retention).

Technical Context

The AT24C32D-MAHM-E operates as an I²C slave device with fixed 7-bit device address prefix 1010b and configurable A2/A1/A0 inputs enabling up to eight devices on one bus. It implements Schmitt-triggered, noise-filtered SDA/SCL inputs and supports bidirectional data transfer with ACK/NACK handshaking per byte.

Memory is organized into 128 pages of 32 bytes each, supporting byte-write, page-write (with partial-page capability), current-address read, random read, and sequential read. Internal Power-on Reset (POR) ensures command rejection until VCC stabilizes above 1.5 V and tPUP ≥ 100 µs elapses.

Key Specifications

Pinout & Package

AT24C32D-MAHM-E is supplied in an 8-pad XDFN package (2.0 mm × 1.6 mm, 0.5 mm pitch) with wettable flank leads for automated optical inspection. Pin 1 is A0 (top-left corner, marked dot); pin layout matches industry-standard 8-pad XDFN footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32D-MAHM-E, the SOIC variant offers easier manual handling and thermal margin at the cost of footprint size, while the ST alternative trades 1 MHz performance for second-source availability - neither provides drop-in replacement without layout or timing validation.

Availability

AT24C32D-MAHM-E is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded configuration storage, and power-management parameter retention requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.

Supply support for AT24C32D-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified manufacturing and global distribution.

The AT24C32D-MAHM-E belongs to Microchip's AT24Cxx family of I²C EEPROMs, designed specifically for robust, low-power, multi-voltage nonvolatile storage in industrial, automotive, and consumer systems where data integrity and long-term reliability are mandatory.

FAQ

What is the maximum I²C clock frequency supported by the AT24C32D-MAHM-E?

The AT24C32D-MAHM-E supports three I²C speed modes: 100 kHz (Standard Mode), 400 kHz (Fast Mode), and 1 MHz (Fast Mode Plus). FM+ operation requires VCC ≥ 2.5 V and is validated per DS20006047A AC characteristics. At 5.0 V, the device achieves full 1 MHz timing compliance with tLOW/tHIGH ≤ 500 ns.

Does the AT24C32D-MAHM-E require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C32D-MAHM-E requires external pull-up resistors on both SDA and SCL. SDA is open-drain and must be pulled high (≤10 kΩ recommended); SCL may be driven actively or pulled up. Resistor value depends on bus capacitance and target speed: 1.3 kΩ for 1 MHz, 4 kΩ for 400 kHz, and 10 kΩ for 100 kHz per Microchip's DS20006047A.

How does the Write-Protect (WP) pin function on the AT24C32D-MAHM-E?

The WP pin on the AT24C32D-MAHM-E is an active-high hardware lock. When tied to VCC, it disables all write operations to the entire memory array. When grounded or left floating (internally pulled down), normal writes are enabled. Microchip recommends hardwiring WP to a known state - not relying on internal pull-down - to prevent spurious writes during noise events.

What is the memory organization of the AT24C32D-MAHM-E?

The AT24C32D-MAHM-E contains 32,768 bits organized as 4,096 words of 8 bits each, structured into 128 pages of 32 bytes. Addressing uses two 8-bit word address bytes: the first carries A11–A8 (bits 3–0) with "don't care" upper bits, and the second carries A7–A0. This layout enables efficient sequential reads across page boundaries.

Is the AT24C32D-MAHM-E compatible with standard I²C protocol stacks?

Yes, the AT24C32D-MAHM-E is fully compliant with the NXP I²C-bus specification v3.0. It implements standard START/STOP conditions, ACK/NACK handshaking, 7-bit addressing with R/W bit, and byte-wise data transfer. No custom drivers are needed - it works with generic Linux i2c-dev, Arduino Wire, or STM32 HAL_I2C libraries without modification.