Microchip Technology AT24C128-10TU-1.8

Overview

AT24C128-10TU-1.8 from Microchip Technology (formerly Atmel) is a 128 Kbit (16,384 × 8) two-wire serial EEPROM optimized for low-voltage embedded systems. It operates from 1.8 V to 3.6 V, supports 100 kHz I²C bus speed at 1.8 V, features hardware write protection via the WP pin, and delivers 1 million write cycles with 40-year data retention. It is used in industrial sensor calibration storage and power-meter firmware parameter backup.

For engineers reviewing the AT24C128-10TU-1.8 datasheet, AT24C128-10TU-1.8 pinout, AT24C128-10TU-1.8 application, or AT24C128-10TU-1.8 equivalent, key selection factors include its 1.8 V operation range, 8-lead TSSOP package (8A2), 64-byte page write capability, Schmitt-trigger inputs for noise immunity, and compatibility with standard I²C protocol timing at 100 kHz.

Technical Context

The AT24C128-10TU-1.8 implements a standard two-wire (I²C-compatible) serial interface with open-drain SDA and active-high SCL, supporting cascaded addressing via A0/A1 pins for up to four devices on one bus. Its internal architecture organizes memory as 256 pages of 64 bytes each, enabling partial-page writes without address rollover beyond page boundaries.

It uses an internal proprietary bias circuit on A0, A1, and WP pins to pull them low when floating-provided capacitive coupling to VCC plane is below 3 pF. The device enters standby mode after STOP condition receipt and supports acknowledge polling during internal write cycles to avoid software delays.

Key Specifications

Pinout & Package

AT24C128-10TU-1.8 is packaged in an 8-lead Plastic Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 variation AA, body size 4.4 mm × 3.0 mm × 1.2 mm, lead pitch 0.65 mm. Pin 1 is marked by a notch or dot in the top-left corner (viewed from top, leads down).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C128-10TU-1.8, AT24C128B-SSHM-T offers identical functionality in a larger SOIC package with guaranteed extended-temp performance, while M24128-BWMN6TP provides superior 400 kHz I²C speed at 1.8 V in the same TSSOP footprint-making it the most seamless upgrade path for throughput-sensitive applications.

Availability

AT24C128-10TU-1.8 is available at Aetrix Electronics and suitable for industrial sensor calibration storage, smart meter firmware parameter backup, and medical device configuration retention requiring stable component supply across multi-year production cycles.

Supply support for AT24C128-10TU-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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on embedded control and connectivity.

The AT24C128 series belongs to Microchip's legacy serial EEPROM product line, designed specifically for cost-sensitive, low-power, and space-constrained industrial and commercial applications requiring reliable nonvolatile storage.

FAQ

What is the maximum I²C clock frequency supported by AT24C128-10TU-1.8 at 1.8 V?

The AT24C128-10TU-1.8 supports a maximum I²C clock frequency of 100 kHz when operating at 1.8 V. This value is specified in Table 4 (AC Characteristics – Industrial Temperatures) and reflects the timing constraints imposed by lower supply voltage on internal logic propagation and bus capacitance handling. Exceeding this frequency may result in read/write failures or data corruption.

Does AT24C128-10TU-1.8 support page write operations, and what is the page size?

Yes, AT24C128-10TU-1.8 supports 64-byte page write operations. The device is internally organized into 256 pages of 64 bytes each, allowing up to 64 sequential bytes to be written in a single I²C transaction. This significantly improves write efficiency compared to byte-wise programming and is essential for logging or configuration updates where latency matters.

How is the I²C device address determined for AT24C128-10TU-1.8?

The AT24C128-10TU-1.8 uses a 7-bit I²C slave address formed as 1010[A1][A0][R/W], where A1 and A0 are hardwired or left floating (internally pulled low). With both A0 and A1 grounded or floating, the base address becomes 0x50. The R/W bit (bit 0) selects read (1) or write (0), resulting in write address 0x50 and read address 0x51 on the bus.

Is AT24C128-10TU-1.8 suitable for extended temperature applications (–40°C to +125°C)?

No, AT24C128-10TU-1.8 is rated for industrial temperature range (–40°C to +85°C) only. Devices qualified for extended temperature (–40°C to +125°C) carry the "B" process suffix (e.g., AT24C128B-SSHM-T) and are explicitly marked with a "B" on the package. Using AT24C128-10TU-1.8 beyond +85°C risks data corruption and premature wear-out.

What is the function of the WP pin on AT24C128-10TU-1.8, and how should it be connected?

The WP (Write Protect) pin on AT24C128-10TU-1.8 disables all write operations-including byte, page, and erase-when driven high to VCC. When tied to GND, normal write access is enabled. If left floating, the pin is internally pulled low (subject to <3 pF capacitive coupling), but Microchip recommends explicit GND connection for robustness in production designs.