Microchip Technology AT24C02D-MAHM-E

Overview

AT24C02D-MAHM-E from Microchip Technology is a 2-Kbit I²C-compatible serial EEPROM organized as 256 × 8-bit memory, operating from 1.7V to 3.6V with industrial temperature range (−40°C to +85°C), 1 MHz Fast Mode Plus support, and hardware write-protection via WP pin - used for nonvolatile configuration storage in embedded microcontroller systems.

For engineers reviewing the AT24C02D-MAHM-E datasheet, AT24C02D-MAHM-E pinout, AT24C02D-MAHM-E application, or AT24C02D-MAHM-E equivalent, key selection considerations include voltage compatibility (1.7–3.6 V), I²C bus speed mode support (Standard/Fast/Fast Mode Plus), page write capability (8-byte pages), write endurance (1M cycles), and package-specific pin mapping (8-pad UDFN).

Technical Context

The AT24C02D-MAHM-E functions as an I²C slave device with fixed 7-bit address prefix 1010b and three programmable address bits (A2–A0), enabling up to eight devices on one bus. It implements Schmitt-triggered, filtered SDA/SCL inputs for noise immunity and supports bidirectional data transfer with ACK/NACK handshaking per byte.

Its internal architecture includes a high-voltage generation circuit for EEPROM programming, hardware write protection logic tied to the WP pin, and automatic power-on reset (POR) with tPUP = 100 µs delay before command acceptance. Memory is organized into 32 pages of 8 bytes each, supporting both random and sequential read modes.

Key Specifications

Pinout & Package

AT24C02D-MAHM-E is packaged in an 8-pad UDFN (2 mm × 3 mm, 0.5 mm pitch) with wettable flanks, RoHS-compliant and halide-free. 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 M24C02-RMN6TP and BR24G02FJ-WE2, AT24C02D-MAHM-E delivers superior industrial reliability (−40°C to +85°C), lowest guaranteed standby current (0.8 μA max), and full 1 MHz Fast Mode Plus support - making it optimal for space-constrained, battery-powered, and harsh-environment designs.

Availability

AT24C02D-MAHM-E is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, medical sensors, automotive body control units, and battery-powered IoT edge nodes requiring stable component supply across extended temperature and long product lifecycles.

Supply support for AT24C02D-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 leading provider of microcontrollers, analog, FPGA, and memory solutions, with a focus on embedded control and connectivity.

The AT24C02D-MAHM-E belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for low-voltage, low-power, and high-reliability nonvolatile data storage in resource-constrained embedded systems.

FAQ

What is the memory organization of the AT24C02D-MAHM-E?

The AT24C02D-MAHM-E contains 2,048 bits of EEPROM memory organized as 256 words of 8 bits each, grouped into 32 pages of 8 bytes. This structure supports efficient byte-level writes and 8-byte page writes, enabling optimized update patterns for configuration data without full-array erasure. The memory map is fixed and does not require initialization.

Does the AT24C02D-MAHM-E support 1 MHz I²C communication?

Yes, the AT24C02D-MAHM-E supports Fast Mode Plus (FM+) at up to 1 MHz, but only when VCC is between 2.5 V and 3.6 V. At lower voltages (1.7–2.5 V), it operates in Standard (100 kHz) or Fast (400 kHz) mode. This voltage-dependent speed scaling ensures signal integrity while maximizing throughput where supply conditions allow.

How does the Write-Protect (WP) pin function on the AT24C02D-MAHM-E?

When the WP pin is driven high (to VCC), the AT24C02D-MAHM-E inhibits all write operations to its entire memory array. When WP is low (GND), normal writes are enabled. If left floating, WP is internally pulled down - but Microchip recommends hardwiring it to avoid noise-induced glitches. This hardware lock complements software-based protection for critical configuration data.

What is the maximum write cycle time for the AT24C02D-MAHM-E?

The AT24C02D-MAHM-E has a maximum self-timed write cycle time of 5 ms, covering both byte and page writes. During this period, the device does not respond to I²C commands and pulls SDA low to signal busy status. Host firmware can use acknowledge polling or fixed delay to detect completion - no external timing components are needed.

Is the AT24C02D-MAHM-E compatible with standard I²C protocol?

Yes, the AT24C02D-MAHM-E is fully I²C-compatible, implementing standard Start/Stop conditions, 7-bit addressing with 1010b prefix, ACK/NACK handshaking, and clock stretching. It adheres to I²C specification timing requirements across all supported modes (Standard, Fast, Fast Mode Plus), ensuring interoperability with any compliant master controller.