Microchip Technology AT24C01BY6-YH-T

Overview

AT24C01BY6-YH-T from Microchip Technology is a 1K-bit (128 × 8) two-wire serial EEPROM with 1.8V to 5.5V operation, 400 kHz/1 MHz I²C interface speed, hardware write protection via WP pin, and 8-ball dBGA2 package. It delivers high-reliability nonvolatile storage for space-constrained industrial control and embedded sensor nodes requiring low-power, byte-level reprogrammability.

For engineers reviewing the AT24C01BY6-YH-T datasheet, AT24C01BY6-YH-T pinout, AT24C01BY6-YH-T application, or AT24C01BY6-YH-T equivalent, key selection criteria include its 1.8V–5.5V supply range, 8-byte page write capability, 1 million write cycles endurance, 100-year data retention, and NiPdAu lead finish compatibility with fine-pitch assembly processes.

Technical Context

The AT24C01BY6-YH-T implements a standard I²C-compatible two-wire interface with Schmitt-triggered, noise-filtered SCL and SDA inputs. Its internal address decoder supports up to eight devices on one bus using A0–A2 pins, and the WP pin enables hardware-level write lock for critical configuration data.

It features self-timed write cycles (≤5 ms), partial page writes, and operates across –40°C to +85°C industrial temperature range. The device uses internal high-voltage charge pump for EEPROM programming and includes data recovery logic to ensure integrity after power loss during write operations.

Key Specifications

Pinout & Package

AT24C01BY6-YH-T is housed in an 8-ball dBGA2 package (2.0 mm × 3.0 mm body, 0.5 mm pitch), optimized for automated surface-mount assembly and thermal performance in compact layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01D-SSHM-T and M24C01-RMN6TP, the AT24C01BY6-YH-T uniquely combines ultra-small dBGA2 packaging, NiPdAu finish for fine-pitch reliability, and integrated WP pin-making it optimal for next-generation space- and safety-critical embedded systems.

Availability

AT24C01BY6-YH-T is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial PLC configuration memory, and medical sensor node ID storage requiring stable component supply and long-term lifecycle support.

Supply support for AT24C01BY6-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 leading provider of microcontrollers, analog components, and memory solutions, serving industrial, automotive, and communications markets with vertically integrated silicon and software platforms.

The AT24C01B series was designed specifically for reliable, low-voltage serial EEPROM storage in space-constrained embedded systems-emphasizing robustness, ease of I²C integration, and extended data retention under real-world operating conditions.

FAQ

What is the maximum I²C clock frequency supported by the AT24C01BY6-YH-T?

The AT24C01BY6-YH-T supports up to 1 MHz I²C clock frequency at VCC = 5.0V, and 400 kHz at VCC = 1.8V, 2.5V, or 2.7V. These speeds are validated across the full industrial temperature range (–40°C to +85°C) and align with standard-mode and fast-mode I²C specifications. The device's Schmitt-triggered inputs ensure timing margin even under noisy conditions.

Does the AT24C01BY6-YH-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C01BY6-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 to 10 kΩ depending on bus capacitance and desired rise time. The AT24C01BY6-YH-T itself does not include internal pull-ups, so omission will prevent proper bus communication.

How does the WP pin function on the AT24C01BY6-YH-T?

The WP (Write Protect) pin on the AT24C01BY6-YH-T is an active-high hardware lock that disables all write operations-including byte, page, and erase commands-when driven to VCC. When grounded or left floating (with internal weak pull-down), writes are enabled. This feature protects critical configuration data from corruption during power transients or firmware bugs.

What is the package dimension and ball pitch of the AT24C01BY6-YH-T?

The AT24C01BY6-YH-T uses an 8-ball dBGA2 package measuring 2.0 mm × 3.0 mm with a 0.5 mm ball pitch. This ultra-thin dual-no-lead format supports fine-pitch reflow assembly and offers superior thermal performance compared to SOIC or TSSOP alternatives, making it ideal for compact, thermally demanding applications.

Is the AT24C01BY6-YH-T compatible with standard I²C protocol stacks in common MCUs?

Yes, the AT24C01BY6-YH-T is fully compliant with the standard I²C protocol specification, including START/STOP conditions, ACK/NACK handshaking, and 7-bit addressing (0x50–0x57 via A0–A2). It has been validated with ARM Cortex-M, PIC, ESP32, and STM32 I²C peripherals, requiring no custom driver modifications beyond standard address and timing configuration.