Microchip Technology AT24C02BY6-YH-T

Overview

AT24C02BY6-YH-T from Microchip Technology (formerly Atmel) is a 2 Kbit I²C-compatible serial EEPROM organized as 256 × 8 bits, operating from 1.8 V to 5.5 V, featuring hardware write protection via the WP pin and 8-byte page write capability. It is designed for nonvolatile data storage in embedded systems requiring low-power, space-constrained configurations such as smart meters, industrial sensors, and IoT endpoint devices.

For engineers reviewing the AT24C02BY6-YH-T datasheet, AT24C02BY6-YH-T pinout, AT24C02BY6-YH-T application, or AT24C02BY6-YH-T equivalent, key selection criteria include its 1 MHz (5V) / 400 kHz (1.8V) I²C speed, 1 million write endurance, 100-year data retention, 2.0 mm × 3.0 mm Ultra-Thin Mini-MAP (MLP 2×3) DFN package, and NiPdAu lead finish for enhanced solderability and reliability.

Technical Context

The AT24C02BY6-YH-T implements a two-wire serial interface with Schmitt-triggered, noise-filtered SCL/SDA inputs and supports standard I²C protocol timing-including START/STOP conditions, ACK polling, and byte/page write sequences. Its internal address counter enables current-address, random-address, and sequential read modes without external address latching.

Device addressing uses hardwired A0–A2 pins to support up to eight devices on a shared bus; the WP pin provides hardware-level write protection for the full 2K array when tied to VCC. The EEPROM integrates high-voltage pump circuitry for internal write-cycle timing, eliminating external timing components.

Key Specifications

Pinout & Package

AT24C02BY6-YH-T is housed in an 8-lead Ultra-Thin Mini-MAP (MLP 2×3 mm) dual no-lead package with exposed thermal pad (non-electrical). Pin 1 is marked by a corner index dot on the top surface; bottom-side terminals are arranged in a 2×4 grid with no leads extending beyond the body perimeter.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C02-RMN6TP and R1EX24002ASAS0I, the AT24C02BY6-YH-T uniquely combines ultra-compact MLP 2×3 packaging, NiPdAu termination, and guaranteed 100-year data retention-making it optimal for next-generation space- and reliability-critical embedded designs.

Availability

AT24C02BY6-YH-T is available at Aetrix Electronics and suitable for smart energy meters, industrial PLC modules, medical diagnostic sensors, and automotive body control units requiring stable component supply across multi-year production cycles.

Supply support for AT24C02BY6-YH-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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with leadership in secure, low-power, and high-reliability embedded components.

The AT24C02B series was developed to deliver cost-effective, pin-compatible serial EEPROMs for industrial, medical, and consumer applications demanding long-term data integrity and minimal board space.

FAQ

What is the maximum I²C clock frequency supported by the AT24C02BY6-YH-T?

The AT24C02BY6-YH-T supports up to 1 MHz at VCC = 5.0 V and 400 kHz at VCC = 1.8 V, 2.5 V, or 2.7 V. These frequencies are specified under standard load conditions (CL = 100 pF) and ensure reliable communication across its full operating voltage range. The AT24C02BY6-YH-T does not support higher speeds such as Fast Mode Plus (1 MHz universal) or High-Speed Mode (3.4 MHz) without external signal conditioning.

Does the AT24C02BY6-YH-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C02BY6-YH-T requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Typical values range from 1.8 kΩ (for 1 MHz at 5 V) to 10 kΩ (for 400 kHz at 1.8 V), selected based on bus capacitance and rise-time requirements. The AT24C02BY6-YH-T itself contains no internal pull-ups.

How does the Write Protect (WP) pin function on the AT24C02BY6-YH-T?

When the WP pin of the AT24C02BY6-YH-T is driven high (connected to VCC), all write operations-including byte, page, and write-enable commands-are blocked, placing the entire 2K memory array in read-only mode. When WP is grounded, normal read and write access is enabled. This hardware-level protection operates independently of software commands and remains active across power cycles.

Can the AT24C02BY6-YH-T be used in automotive applications?

The AT24C02BY6-YH-T is qualified for industrial temperature range (–40°C to +85°C) and is not officially qualified for automotive AEC-Q100 standards. While it may function in some body-control or infotainment applications, Microchip does not guarantee performance under automotive qualification stress tests. For automotive use, consider the pin-compatible AT24C02C variant, which carries AEC-Q100 Grade 2 certification.

What package type does the AT24C02BY6-YH-T use, and what are its key mechanical dimensions?

The AT24C02BY6-YH-T uses the 8-lead Ultra-Thin Mini-MAP (MLP 2×3 mm) package, also designated 8Y6. Its body measures exactly 2.00 mm × 3.00 mm with 0.50 mm pitch, 0.30 mm maximum height, and a non-electrical thermal pad centered on the underside. This DFN-style package enables high-density layouts unsuitable for traditional SOIC or TSSOP footprints.