Microchip Technology AT24C128BY6-YH-T

Overview

AT24C128BY6-YH-T from Microchip Technology (formerly Atmel) is a 128 Kbit I²C-compatible serial EEPROM organized as 16,384 × 8 bits, operating from 1.8 V to 5.5 V, featuring 64-byte page write mode, 1 MHz max clock speed at 5.5 V, and hardware write protection via WP pin - used for nonvolatile parameter storage in industrial sensor nodes and embedded control modules.

For engineers reviewing the AT24C128BY6-YH-T datasheet, AT24C128BY6-YH-T pinout, AT24C128BY6-YH-T application, or AT24C128BY6-YH-T equivalent, key selection criteria include its 2.0 mm × 3.0 mm Ultra Thin Mini MAP (8Y6) package, 1.8 V–5.5 V supply range, 1 million write cycles endurance, 40-year data retention, and compatibility with standard two-wire bus systems supporting up to eight cascaded devices.

Technical Context

The AT24C128BY6-YH-T implements a two-wire (I²C) serial interface with Schmitt-triggered, noise-filtered SDA and SCL inputs, supporting standard-mode (400 kHz at 1.8 V) and fast-mode (1 MHz at 5.5 V) operation. It uses an internal address counter and supports byte- and page-write protocols with self-timed 5 ms max write cycles.

Device addressing relies on three hardware-configurable pins (A2–A0), enabling up to eight devices on a shared bus. The WP pin provides hardware-level write inhibition when tied to V_CC, while internally pulled-down default states prevent floating-input instability - critical for robust operation in noisy industrial environments.

Key Specifications

Pinout & Package

AT24C128BY6-YH-T is packaged in an 8-lead Ultra Thin Mini MAP (DFN/MLP, 2.0 mm × 3.0 mm body, 0.50 mm pitch), JEDEC MO-229 compliant, with exposed thermal pad (non-electrical, optional grounding).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C128BY6-YH-T, M24128-BWMN6TP offers identical functionality in a larger TSSOP package, while BR24G128FJ-3GE2 adds ECC at the cost of SOIC footprint - making AT24C128BY6-YH-T optimal for space-constrained industrial designs prioritizing minimal board area and proven field reliability.

Availability

AT24C128BY6-YH-T is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, medical device serialization, and automotive body control module settings requiring stable component supply across multi-year production cycles.

Supply support for AT24C128BY6-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 product continuity, technical support, and qualification for the AT24Cxx EEPROM family.

The AT24C128B series was designed for low-power, low-voltage embedded systems requiring reliable, byte-addressable nonvolatile memory - especially where I²C bus simplicity, small footprint, and extended temperature operation are mandatory.

FAQ

What is the package type and dimensions of the AT24C128BY6-YH-T?

The AT24C128BY6-YH-T uses an 8-lead Ultra Thin Mini MAP (DFN/MLP) package, designated 8Y6, with exact dimensions of 2.0 mm × 3.0 mm body size and 0.50 mm lead pitch. Its footprint is JEDEC MO-229 compliant, and it features a non-electrical thermal pad on the bottom surface - optional to solder but recommended for thermal relief in high-duty-cycle write scenarios. This package is significantly smaller than SOIC or TSSOP alternatives.

Does the AT24C128BY6-YH-T support 1.8 V operation, and what is its maximum I²C clock frequency at that voltage?

Yes, the AT24C128BY6-YH-T fully supports 1.8 V operation across its entire specified temperature range (−40°C to +85°C). At 1.8 V, its maximum guaranteed I²C clock frequency is 400 kHz - validated under industrial conditions with 10 kΩ pull-ups and CL = 100 pF. This ensures robust communication in battery-powered or energy-harvesting systems where low-voltage operation is essential.

How many devices can share the same I²C bus with the AT24C128BY6-YH-T, and how is addressing managed?

Up to eight AT24C128BY6-YH-T devices can share a single I²C bus using hardware address pins A2, A1, and A0. These pins accept static logic levels (V_CC or GND) to generate a 3-bit device address, combined with the fixed 1010 prefix to form the full 7-bit slave address. Floating A0–A2 pins default to GND internally, but Atmel recommends hardwiring them to avoid capacitive coupling issues in noisy environments.

What is the write endurance and data retention specification for the AT24C128BY6-YH-T?

The AT24C128BY6-YH-T guarantees 1,000,000 write/erase cycles per memory location and 40 years of data retention at +25°C. These values are characterized and tested per AEC-Q100 stress methodologies and apply across the full operating voltage and temperature range. Real-world retention may extend beyond 40 years at lower ambient temperatures, but 40 years is the minimum rated specification.

Is the AT24C128BY6-YH-T RoHS-compliant and halogen-free?

Yes, the AT24C128BY6-YH-T is both RoHS-compliant and halogen-free, with NiPdAu lead finish as indicated in its ordering code suffix "-YH-T". This meets IPC-1752A material declaration requirements and supports environmentally regulated deployments in EU, Japan, and North American markets. Full compliance documentation, including substance declarations and test reports, is available through Microchip's quality portal.