Microchip Technology AT24C02D-MAHM-T

Overview

AT24C02D-MAHM-T from Microchip Technology is a 2-Kbit I²C-compatible serial EEPROM organized as 256 × 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 configuration storage in embedded microcontroller systems.

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

Technical Context

The AT24C02D-MAHM-T implements a two-wire I²C slave interface with Schmitt-triggered, filtered SCL/SDA inputs for noise immunity, and supports bidirectional data transfer with ACK/NACK handshaking. It uses internal address latching and auto-incrementing during sequential reads.

Its memory is partitioned into 32 pages of 8 bytes each, enabling partial-page writes and random/sequential read modes. Write protection is controlled by the WP pin, which inhibits full-array writes when pulled high, and all address pins (A0–A2) are internally pulled down if left floating.

Key Specifications

Pinout & Package

AT24C02D-MAHM-T is housed in an 8-pad UDFN (Ultra Thin Dual Flat No-lead) package, 2.0 mm × 1.6 mm × 0.55 mm, with wettable flank leads for automated optical inspection (AOI) and solder joint reliability. Exposed pad 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, AT24C02D-MAHM-T enables faster communication and lower-voltage operation; versus BR24G02NUX-10, it offers deterministic hardware write protection without register access overhead - simplifying safety-critical firmware design.

Availability

AT24C02D-MAHM-T is available at Aetrix Electronics and suitable for smart metering, industrial PLC I/O modules, medical diagnostic sensors, and automotive body control modules requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.

Supply support for AT24C02D-MAHM-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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified quality systems and global distribution.

The AT24C02D belongs to Microchip's serial EEPROM product line, designed specifically for low-voltage, low-power, and high-reliability nonvolatile data storage in space-constrained embedded systems.

FAQ

What is the exact memory organization of the AT24C02D-MAHM-T?

The AT24C02D-MAHM-T contains 2,048 bits of EEPROM memory, organized as 256 words of 8 bits each (256 × 8). It is physically structured into 32 pages of 8 bytes, supporting both byte-write and 8-byte page-write operations. This layout allows efficient partial updates without erasing entire memory blocks, and is confirmed in Microchip's DS20006100A datasheet Section 6 and Table 6-1.

Does the AT24C02D-MAHM-T support 1 MHz I²C communication, and under what conditions?

Yes, the AT24C02D-MAHM-T supports 1 MHz Fast Mode Plus (FM+) I²C operation, but only when VCC is between 2.5V and 3.6V. At 1.7–2.4V, it operates in Standard (100 kHz) or Fast (400 kHz) mode only. This voltage-dependent speed grading is specified in DS20006100A Section 4.4, Table 4-3, and is enforced by internal timing circuitry - no external configuration is needed.

How does the write-protect (WP) pin function on the AT24C02D-MAHM-T?

On the AT24C02D-MAHM-T, the WP pin provides hardware-level write inhibition: when tied to VCC, all write operations (byte and page) to the entire memory array are blocked; when tied to GND, normal writes are enabled. If left floating, WP is internally pulled down to GND, enabling writes - but Microchip recommends hardwiring it for deterministic behavior, as stated in Section 2.5 and Table 2-2 of DS20006100A.

What is the package type and footprint of the AT24C02D-MAHM-T?

The AT24C02D-MAHM-T uses an 8-pad UDFN (Ultra Thin Dual Flat No-lead) package, measuring 2.0 mm × 1.6 mm × 0.55 mm with wettable flank leads. Pin 1 is marked by a dot; the exposed thermal pad may be connected to GND or left floating. This footprint is distinct from SOIC or TSSOP variants and is documented in DS20006100A Figure 1-1 (page 4) and Section 10.1.

What are the absolute maximum ratings and reliability metrics for the AT24C02D-MAHM-T?

The AT24C02D-MAHM-T has an absolute maximum VCC of 4.1V and operating temperature range of −40°C to +85°C. Its reliability metrics include 1,000,000 write cycles and 100 years of data retention at 55°C, both verified per JEDEC qualification standards and published in DS20006100A Section 4.5.3 (Table 4-6). ESD protection exceeds 4,000V HBM.