Microchip Technology AT24C32CY6-YH-T

Overview

AT24C32CY6-YH-T from Microchip Technology (formerly Atmel) is a 32 Kbit I²C-compatible serial EEPROM organized as 4096 × 8 bits, housed in an 8-lead Ultra Thin Mini-MAP (MLP 2×3) package with NiPdAu lead finish. It operates from 1.8 V to 5.5 V, supports up to 1 MHz clock at 5.0 V, features hardware write protection via WP pin, and delivers 1 million write cycles with 100-year data retention - deployed in industrial sensor calibration and embedded system configuration storage.

For engineers reviewing the AT24C32CY6-YH-T datasheet, AT24C32CY6-YH-T pinout, AT24C32CY6-YH-T application, or AT24C32CY6-YH-T equivalent, key selection criteria include its 2.0 mm × 3.0 mm DFN footprint, 32-byte page write capability, Schmitt-triggered noise-immune inputs, and compatibility with 1.8 V–5.5 V supply rails across automotive control modules, medical device parameter storage, and IoT edge node firmware settings.

Technical Context

The AT24C32CY6-YH-T implements a standard two-wire (I²C) interface with open-drain SDA and active-high SCL, supporting standard-mode (400 kHz at 1.8 V) and fast-mode (1 MHz at 5.0 V) operation. Its internal address counter enables current-address and random-address read modes, while cascading up to eight devices on one bus is enabled by three hardware-configurable address pins (A0–A2).

Write operations use either byte-write (single 8-bit word) or page-write (up to 32 bytes per cycle), with self-timed internal erase/write completing in ≤5 ms. The WP pin provides hardware-level memory lockout when pulled high, and all inputs feature Schmitt-triggering plus digital filtering for robustness in electrically noisy environments.

Key Specifications

Pinout & Package

AT24C32CY6-YH-T uses an 8-lead Ultra Thin Mini-MAP (MLP 2×3) package: 2.00 mm × 3.00 mm body, 0.50 mm pitch, dual no-lead (DFN) construction with exposed thermal pad (non-electrical, optional grounding). Pin 1 is marked by a dot in the bottom-left corner (viewed from top).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32CY6-YH-T, AT24C32D-SSHM-T offers SOIC handling advantages but requires PCB redesign, while M24C32-WMN6TP provides true pin-and-footprint compatibility with marginally faster write timing - making it the preferred alternative for second-source qualification without layout change.

Availability

AT24C32CY6-YH-T is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device parameter storage, and automotive body control modules requiring stable component supply across extended product lifecycles.

Supply support for AT24C32CY6-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 acquired Atmel in 2016 and maintains full technical and manufacturing continuity for the AT24Cxx EEPROM family.

The AT24C32 series targets cost-sensitive, space-constrained embedded systems needing reliable nonvolatile storage with minimal external components and broad voltage compatibility.

FAQ

What is the maximum I²C clock frequency supported by the AT24C32CY6-YH-T?

The AT24C32CY6-YH-T supports up to 1 MHz I²C clock frequency when VCC = 5.0 V, and guarantees 400 kHz operation at minimum VCC = 1.8 V. AC timing parameters including tLOW (1.3 µs min at 1.8 V) and tHIGH (0.6 µs min at 1.8 V) are fully characterized across the industrial temperature range (−40°C to +85°C). This ensures interoperability with both legacy 400 kHz controllers and modern fast-mode peripherals without protocol adaptation.

Does the AT24C32CY6-YH-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C32CY6-YH-T requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Recommended values are 1.3 kΩ for 5.0 V operation and 10 kΩ for 1.8 V operation, per the datasheet's AC measurement conditions. These values ensure proper rise times (tR ≤ 0.3 µs) and noise immunity while maintaining bus capacitance compliance (CL ≤ 100 pF).

How does the WP (Write Protect) pin function on the AT24C32CY6-YH-T?

The WP pin on the AT24C32CY6-YH-T disables all write operations when pulled high to VCC. When WP is low or left floating (internally biased to GND if capacitive coupling to VCC plane <3 pF), normal read/write access is permitted. This hardware-level protection prevents accidental overwrites during power transitions or firmware errors - a critical safeguard for calibration data and safety-critical configuration in AT24C32CY6-YH-T deployments.

What package type is used for the AT24C32CY6-YH-T, and what are its key mechanical dimensions?

The AT24C32CY6-YH-T uses an 8-lead Ultra Thin Mini-MAP (MLP 2×3) package, also referenced as DFN or 8Y6. Its body measures 2.00 mm × 3.00 mm with 0.50 mm pitch; overall height is ≤0.60 mm. Pin 1 is marked by a dot in the bottom-left corner. The thermal pad is non-electrical and may be grounded optionally - no solder connection is required for functionality.

Can multiple AT24C32CY6-YH-T devices share the same I²C bus?

Yes, up to eight AT24C32CY6-YH-T devices can share a single I²C bus using hardware address pins A0, A1, and A2. Each pin can be hardwired to VCC or GND to configure a unique 3-bit device address (0x50–0x57). Floating address pins default to GND via internal bias, enabling simple expansion without additional address decoding logic - a key advantage in modular AT24C32CY6-YH-T-based systems.