Microchip Technology AT24C02D-XHM-B

Overview

AT24C02D-XHM-B 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 parameter storage in embedded control modules, sensor calibration registers, and power-management configuration.

For engineers reviewing the AT24C02D-XHM-B datasheet, AT24C02D-XHM-B pinout, AT24C02D-XHM-B application, or AT24C02D-XHM-B equivalent, key selection considerations include VCC voltage compatibility (1.7–3.6V), 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 for UDFN-8.

Technical Context

The AT24C02D-XHM-B 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, noise-filtered SDA/SCL inputs and supports bidirectional data transfer with ACK/NACK handshaking per byte.

Its memory is organized into 32 pages of 8 bytes each, supporting byte-write, page-write (with partial-page capability), random read, and sequential read. Internal high-voltage generation enables self-timed write cycles completing within 5 ms maximum, with automatic power-on reset (POR) and tPUP = 100 µs delay before command acceptance.

Key Specifications

Pinout & Package

AT24C02D-XHM-B is supplied in an 8-pad UDFN (Ultra Thin Dual Flat No-lead) package with wettable flanks, measuring 2.0 mm × 1.6 mm × 0.55 mm, RoHS-compliant and halide-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02D-XHM-B, AT24C02C-SSHM-T offers identical electrical behavior but larger SOIC packaging, while M24C02-RMN6TP requires voltage redesign and address remapping - making AT24C02D-XHM-B optimal for compact, low-voltage, production-ready designs.

Availability

AT24C02D-XHM-B is available at Aetrix Electronics and suitable for industrial sensor nodes, medical calibration storage, and smart energy metering requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.

Supply support for AT24C02D-XHM-B 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, FPGA, and memory solutions, with ISO 9001-certified manufacturing and broad automotive/industrial qualification coverage.

The AT24C02D-XHM-B belongs to Microchip's AT24CxxD serial EEPROM family, designed specifically for ultra-low-power, wide-VCC-range nonvolatile storage in space-constrained embedded systems where reliability and I²C interoperability are critical.

FAQ

What is the maximum I²C clock frequency supported by the AT24C02D-XHM-B?

The AT24C02D-XHM-B supports 100 kHz in Standard Mode (1.7–3.6V), 400 kHz in Fast Mode (1.7–3.6V), and 1 MHz in Fast Mode Plus (2.5–3.6V). Operation above 400 kHz requires VCC ≥2.5V and adherence to tR/tF ≤100 ns rise/fall time specifications. The AT24C02D-XHM-B does not support 1 MHz below 2.5V.

Does the AT24C02D-XHM-B require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C02D-XHM-B 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 100 kHz, ≤4 kΩ for 400 kHz, and ≤1.3 kΩ for 1 MHz operation, per Microchip's DS20006100A specification. The AT24C02D-XHM-B itself provides no internal pull-ups.

How is write protection implemented on the AT24C02D-XHM-B?

Write protection on the AT24C02D-XHM-B is implemented via the dedicated WP (Write-Protect) pin: when WP is driven to VCC, all memory writes (byte and page) are inhibited; when WP is at GND, normal write operations proceed. If left floating, WP is internally pulled down to GND, enabling writes - but Microchip recommends hardwiring WP to avoid noise-induced state changes. This hardware lock applies to the entire 2-Kbit array.

What is the memory organization of the AT24C02D-XHM-B?

The AT24C02D-XHM-B is organized as 256 words of 8 bits each (2,048 total bits), arranged in 32 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 modes. The AT24C02D-XHM-B uses a 7-bit I²C address with three hardware-configurable bits (A2–A0), allowing up to eight devices on one bus.

Is the AT24C02D-XHM-B compatible with standard I²C protocol stacks?

Yes, the AT24C02D-XHM-B is fully compliant with the standard I²C protocol, including Start/Stop conditions, ACK/NACK handshaking, 7-bit addressing with R/W bit, and repeated Start support. It implements standard timing parameters (tLOW, tHIGH, tSU.STA, etc.) per NXP I²C-bus specification, and has been validated with common MCU I²C peripherals (e.g., STM32, PIC, ESP32). The AT24C02D-XHM-B requires no custom driver extensions.