Microchip Technology AT24C128N-10SC-2.5

Overview

AT24C128N-10SC-2.5 from Microchip Technology (formerly Atmel) is a 128 Kbit (16,384 × 8) two-wire serial EEPROM optimized for low-voltage embedded systems. It operates across VCC = 2.5V to 5.5V, supports up to 1 MHz I²C clock at 5V and 400 kHz at 2.5V, features hardware write protection via WP pin, and delivers 100,000 write cycles with 40-year data retention - used in industrial sensor calibration storage and firmware parameter backup.

For engineers reviewing the AT24C128N-10SC-2.5 datasheet, AT24C128N-10SC-2.5 pinout, AT24C128N-10SC-2.5 application, or AT24C128N-10SC-2.5 equivalent, this page provides verified electrical specs, JEDEC SOIC-8 package mapping, noise-immune Schmitt-trigger inputs, 64-byte page write timing, and validated alternatives for voltage-flexible I²C memory designs.

Technical Context

The AT24C128N-10SC-2.5 implements a standard two-wire (I²C-compatible) interface with open-drain SDA and edge-triggered SCL, supporting cascaded bus configurations of up to four devices using A0/A1 address pins. Its internal architecture organizes memory as 256 pages of 64 bytes each, enabling partial-page writes without rollover beyond page boundaries when properly addressed.

It integrates Schmitt-trigger inputs and digital noise filtering on SDA/SCL, ensures atomic self-timed write cycles (typ. 5 ms), and uses an internal pull-down on WP to default to writable mode unless actively tied high. The device complies with I²C-bus specification timing for 400 kHz operation at 2.5V, including tLOW ≥ 1.3 µs and tHIGH ≥ 1.0 µs.

Key Specifications

Pinout & Package

AT24C128N-10SC-2.5 is packaged in an 8-pin JEDEC SOIC (8S1), 0.150" wide, with gull-wing leads. Pin 1 is marked by a notch or bevel; the package meets RoHS requirements and supports reflow soldering per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C128-WMN6TP and BR24G128FJ-WE2, the AT24C128N-10SC-2.5 delivers best-in-class noise rejection for industrial I²C buses, guaranteed 400 kHz timing at 2.5V, and proven field reliability in calibration-critical roles - making it optimal where signal integrity and long-term parameter stability outweigh footprint or extended temperature needs.

Availability

AT24C128N-10SC-2.5 is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across manufacturing batches.

Supply support for AT24C128N-10SC-2.5 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 AT24C series. The company specializes in scalable, low-power semiconductor solutions for embedded control and connectivity.

The AT24C128N-10SC-2.5 belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-voltage nonvolatile data storage in resource-constrained embedded systems where I²C simplicity and long-term data integrity are essential.

FAQ

What is the maximum I²C clock frequency supported by AT24C128N-10SC-2.5 at 2.5V?

The AT24C128N-10SC-2.5 supports up to 400 kHz I²C clock frequency when operated at VCC = 2.5V. This is confirmed in the AC Characteristics table (page 5), where fSCL Max = 400 kHz for the 2.5-volt column. Exceeding this frequency may result in timing violations such as insufficient tLOW or tHIGH, leading to communication failures. The AT24C128N-10SC-2.5 must be configured with appropriate pull-up resistors and bus capacitance ≤100 pF to maintain compliance.

Does AT24C128N-10SC-2.5 support page write operations, and what is the maximum page size?

Yes, the AT24C128N-10SC-2.5 supports 64-byte page write operations, as stated in the Features section and Memory Organization description. Each of its 256 pages holds exactly 64 bytes, and the device automatically increments the lower 6 bits of the address during sequential writes within a page. Attempting to write beyond the 64-byte boundary causes rollover to the start of the same page - so firmware must manage page boundaries explicitly. The AT24C128N-10SC-2.5 does not support cross-page writes.

How is write protection implemented on AT24C128N-10SC-2.5, and what happens when WP is left unconnected?

Write protection on the AT24C128N-10SC-2.5 is controlled by the WP pin: tying it to VCC disables all write operations (including page and byte writes), while grounding it enables full read/write access. When left unconnected, an internal pull-down circuit biases WP to GND, resulting in default writable mode. This behavior is documented in the Pin Description section (page 3) and ensures safe operation during prototyping or if the WP trace is omitted. The AT24C128N-10SC-2.5 does not support software-only write protection - WP is strictly hardware-gated.

What package type and dimensions does AT24C128N-10SC-2.5 use, and is it RoHS-compliant?

The AT24C128N-10SC-2.5 uses an 8-pin JEDEC SOIC package (designated 8S1), measuring 4.90 mm × 3.90 mm × 1.75 mm (max height), with 1.27 mm lead pitch. Per Packaging Information (page 16), it conforms to JEDEC MS-012AB standard. The device is RoHS-compliant and lead-free, qualified for Pb-free reflow soldering per J-STD-020. The "SC" suffix in AT24C128N-10SC-2.5 explicitly denotes this SOIC-8 variant, and the AT24C128N-10SC-2.5 is not interchangeable with PDIP, TSSOP, or dBGA variants without layout changes.

What is the guaranteed data retention period and write endurance for AT24C128N-10SC-2.5?

The AT24C128N-10SC-2.5 guarantees 40 years of data retention and 100,000 write/erase cycles under specified operating conditions (VCC = 2.5–5.5V, TA = -40°C to +85°C). These values are listed in the Features section and confirmed in the DC Characteristics table (page 4) under Endurance and Data Retention. Retention is measured at 25°C; elevated temperatures reduce effective lifetime logarithmically. The AT24C128N-10SC-2.5 achieves this via floating-gate oxide quality and rigorous process screening - not algorithmic wear leveling.