Microchip Technology AT24C02C-MAHM-T

Overview

AT24C02C-MAHM-T from Microchip Technology is a 2-Kbit (256 × 8) I²C-compatible serial EEPROM in an 8-pad UDFN package, operating from 1.7V to 5.5V 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 parameter storage in embedded controllers and sensor modules.

For engineers reviewing the AT24C02C-MAHM-T datasheet, AT24C02C-MAHM-T pinout, AT24C02C-MAHM-T application, or AT24C02C-MAHM-T equivalent, key selection considerations include its 8-pin UDFN footprint, I²C bus timing compliance (1 MHz @ VCC ≥ 2.5V), page-write capability (8-byte pages), and hardware write-protection behavior under VCC = 5.5V.

Technical Context

The AT24C02C-MAHM-T implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and internal pull-downs on A0/A1/A2/WP pins. It supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) operation depending on VCC level.

Its memory array is organized as 32 pages of 8 bytes each (256 × 8), enabling partial-page writes and sequential reads. Write cycles are self-timed with ≤5 ms maximum duration, and data retention is rated at 100 years at 55°C with 1,000,000 write endurance cycles.

Key Specifications

Pinout & Package

AT24C02C-MAHM-T uses an 8-pad UDFN package (2.0 mm × 1.6 mm, 0.5 mm pitch) with exposed pad recommended to be connected to GND for thermal and EMI performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C02-RMN6TP and BR24G02NUX-10, AT24C02C-MAHM-T delivers superior speed (1 MHz FM+), lower standby current (6 μA), and guaranteed operation across –40°C to +85°C - making it optimal for compact, battery-sensitive, and thermally demanding embedded systems.

Availability

AT24C02C-MAHM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and IoT edge node identity management requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for AT24C02C-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 leading provider of microcontrollers, analog components, and memory solutions, with a focus on embedded control and connectivity.

The AT24C02C-MAHM-T belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for reliable, low-voltage, low-power nonvolatile data storage in space-constrained industrial and automotive-qualified systems.

FAQ

What is the maximum I²C clock frequency supported by AT24C02C-MAHM-T?

AT24C02C-MAHM-T supports up to 1 MHz in Fast Mode Plus, but only when VCC is between 2.5V and 5.5V. At VCC = 1.7V to 2.5V, maximum speed is limited to 400 kHz (Fast mode). The device does not support 1 MHz operation below 2.5V, and Standard mode (100 kHz) applies across the full 1.7–5.5V range.

Does AT24C02C-MAHM-T require external pull-up resistors on SDA and SCL lines?

Yes, AT24C02C-MAHM-T requires external pull-up resistors on both SDA and SCL lines because SDA is open-drain and SCL is an input. Microchip specifies maximum pull-up values of 10 kΩ for 100 kHz, 4 kΩ for 400 kHz, and 1.3 kΩ for 1 MHz operation - values chosen to meet rise-time requirements under specified bus capacitance (≤100 pF).

How does the WP pin function on AT24C02C-MAHM-T?

When WP is driven high (to VCC), AT24C02C-MAHM-T inhibits all write operations to its entire 2-Kbit memory array. When WP is grounded or left floating (internally pulled down), normal write access is enabled. Microchip recommends hardwiring WP to a known state - not leaving it floating - to prevent spurious writes due to capacitive coupling in noisy environments.

What is the memory organization of AT24C02C-MAHM-T?

AT24C02C-MAHM-T organizes its 2,048 bits as 256 words of 8 bits each, arranged in 32 pages of 8 bytes. This structure enables efficient 8-byte page writes and supports both random and sequential read modes. The device address byte includes three hardware-selectable bits (A0–A2), allowing up to eight AT24C02C-MAHM-T devices on a single I²C bus.

Is AT24C02C-MAHM-T compatible with standard I²C protocol implementations?

Yes, AT24C02C-MAHM-T is fully compliant with standard I²C protocol specifications, including Start/Stop condition generation, ACK/NACK handshaking, 7-bit addressing with R/W bit, and clock stretching support during write cycles. It implements Schmitt-triggered inputs and spike filtering to maintain interoperability in electrically noisy systems using standard I²C masters.