Microchip Technology AT24C02Y1-10YU-1.8

Overview

AT24C02Y1-10YU-1.8 from Microchip Technology is a 2-Kbit (256 × 8) two-wire serial EEPROM optimized for low-voltage embedded systems. It operates from 1.8V to 5.5V, supports 100 kHz I²C communication at 1.8V, features hardware write protection via the WP pin, and delivers 1 million write cycles with 100-year data retention - used in industrial sensor calibration storage and power-management configuration memory.

For engineers reviewing the AT24C02Y1-10YU-1.8 datasheet, AT24C02Y1-10YU-1.8 pinout, AT24C02Y1-10YU-1.8 application, or AT24C02Y1-10YU-1.8 equivalent, key selection factors include its 1.8V minimum supply, 8-pin MAP (4.90 mm × 3.00 mm) package, page-write capability (8-byte pages), Schmitt-trigger inputs for noise immunity, and compatibility with standard I²C bus timing requirements.

Technical Context

The AT24C02Y1-10YU-1.8 implements a standard two-wire (I²C-compatible) interface with open-drain SDA and active-high SCL, supporting bidirectional data transfer and 7-bit device addressing with three hard-wired A0–A2 pins. Its internal architecture organizes memory as 32 pages of 8 bytes each, requiring an 8-bit word address for random access.

It uses a self-timed internal write cycle (max 5 ms), incorporates Schmitt-triggered and filtered inputs for robustness in noisy environments, and enforces hardware write protection through the dedicated WP pin - active high to lock full 2K array - while maintaining full read functionality during write-protection mode.

Key Specifications

Pinout & Package

AT24C02Y1-10YU-1.8 is housed in an 8-lead Miniature Array Package (MAP), 4.90 mm × 3.00 mm body, non-leaded dual footprint (JEDEC MO-187 compliant), with exposed pad optional per design.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02Y1-10YU-1.8, the AT24C02B-10YU-1.8 offers certified automotive reliability and identical hardware interface, while the M24C02-RMN6TP trades WP pin functionality for lower quiescent current and higher speed - making it viable only where firmware-managed protection is acceptable.

Availability

AT24C02Y1-10YU-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration, smart energy meter configuration, and automotive body control module designs requiring stable component supply and long-term obsolescence management.

Supply support for AT24C02Y1-10YU-1.8 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, serving industrial, automotive, and communications markets with vertically integrated silicon and development tools.

The AT24Cxx family was designed specifically for reliable, low-power nonvolatile data storage in space-constrained embedded systems - emphasizing voltage flexibility, noise immunity, and long-term data integrity over raw speed or density.

FAQ

What is the maximum I²C clock frequency supported by AT24C02Y1-10YU-1.8 at 1.8V?

The AT24C02Y1-10YU-1.8 supports a maximum I²C clock frequency of 100 kHz when operated at VCC = 1.8V. This is specified in Table 5 of the datasheet under "1.8-volt" AC characteristics. At higher supply voltages (≥2.7V), the device supports up to 400 kHz - but that performance is not guaranteed at 1.8V. The AT24C02Y1-10YU-1.8 must be configured accordingly in host firmware to avoid communication timeouts or NACK responses.

Does AT24C02Y1-10YU-1.8 require external pull-up resistors on SDA and SCL lines?

Yes, AT24C02Y1-10YU-1.8 requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and desired rise time; for 1.8V operation with ≤200 pF total bus load, 4.7 kΩ is recommended. The AT24C02Y1-10YU-1.8 will not function correctly without these pull-ups, as the bus cannot transition high without them.

Can AT24C02Y1-10YU-1.8 be used in automotive applications?

AT24C02Y1-10YU-1.8 is qualified for industrial temperature range (–40°C to +85°C) and meets RoHS/lead-free requirements, but it is not AEC-Q100 qualified. For production automotive applications, Microchip recommends the pin-compatible AT24C02B-10YU-1.8, which carries full AEC-Q100 Grade 2 certification. While the AT24C02Y1-10YU-1.8 may operate reliably in benign automotive subsystems, its use in safety-critical or production vehicles is not supported per manufacturer guidance.

How many devices can share the same I²C bus with AT24C02Y1-10YU-1.8?

Up to eight AT24C02Y1-10YU-1.8 devices can share a single I²C bus, enabled by the three hardware address pins (A0, A1, A2). Each device must have a unique combination of these pins tied to VCC or GND to generate distinct 7-bit slave addresses (0x50–0x57). Bus loading must remain within I²C specification limits (≤400 pF), so physical trace length and number of devices must be jointly evaluated. The AT24C02Y1-10YU-1.8 does not support software-configurable addressing.

What happens to AT24C02Y1-10YU-1.8 during a power interruption mid-write?

If power is lost during an internal write cycle, the AT24C02Y1-10YU-1.8 may leave the targeted memory location in an indeterminate state. However, the device includes built-in write-cycle abort detection and automatic memory reset upon power restoration: after power-up, issuing nine SCL clocks followed by a START condition restores bus synchronization. The AT24C02Y1-10YU-1.8 does not guarantee atomicity for multi-byte page writes - partial writes require host-side validation or checksum protection.