Microchip Technology AT24C32N-10SC-1.8

Overview

AT24C32N-10SC-1.8 from Microchip Technology (formerly Atmel) is a 32K-bit (4096 × 8) I²C-compatible serial EEPROM optimized for ultra-low-voltage embedded systems. It operates from 1.8V to 5.5V, supports 100 kHz I²C bus speed at 1.8V, features hardware write protection via WP pin, and delivers 1 million write cycles with 100-year data retention - used in battery-powered IoT sensors and portable medical devices.

For engineers reviewing the AT24C32N-10SC-1.8 datasheet, AT24C32N-10SC-1.8 pinout, AT24C32N-10SC-1.8 application, or AT24C32N-10SC-1.8 equivalent, key selection criteria include 1.8V minimum supply operation, 32-byte page write capability, Schmitt-triggered noise-immune I²C interface, and industrial-grade temperature range compatibility (-40°C to +85°C).

Technical Context

The AT24C32N-10SC-1.8 implements a standard two-wire I²C interface with open-drain SDA/SCL pins, internal address latching via A0–A2 pins (enabling up to eight devices on one bus), and hardware-based write protection through the WP pin. Its memory is organized into 256 pages of 32 bytes each, supporting both byte and page write modes.

It uses an internal low-power bias circuit for floating A0–A2 inputs, incorporates Schmitt-triggered inputs with 100 ns noise suppression, and features automatic acknowledge polling during write cycles. The device enters standby mode after STOP condition receipt and maintains current address pointer across read/write operations.

Key Specifications

Pinout & Package

AT24C32N-10SC-1.8 is housed in an 8-pin JEDEC SOIC package (8S1), 0.150" wide, with 1.27 mm pitch and gull-wing leads. This surface-mount package supports automated assembly and provides thermal/mechanical stability for reflow-soldered PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C32-WMN6TP and BR24G32FJ-3GE2, the AT24C32N-10SC-1.8 offers the lowest guaranteed standby current at 1.8V and deterministic 100 kHz timing - making it optimal for energy-constrained, cost-sensitive industrial and medical applications where hardware-level write protection is mandatory.

Availability

AT24C32N-10SC-1.8 is available at Aetrix Electronics and suitable for smart metering, portable diagnostics, industrial PLC modules, automotive body electronics, and battery-powered sensor nodes requiring stable component supply across multi-year production cycles.

Supply support for AT24C32N-10SC-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 acquired Atmel in 2016 and maintains full product support, qualification, and manufacturing continuity for the AT24C series EEPROMs.

The AT24C32N-10SC-1.8 belongs to Microchip's legacy serial EEPROM portfolio, designed specifically for low-voltage, high-reliability nonvolatile storage in space-constrained embedded systems with stringent power budgets.

FAQ

What is the maximum I²C clock frequency supported by AT24C32N-10SC-1.8 at 1.8V?

The AT24C32N-10SC-1.8 supports a maximum I²C clock frequency of 100 kHz when operated at 1.8V. This is explicitly specified in the AC Characteristics table under "1.8-volt" column for parameter fSCL. Higher frequencies (up to 400 kHz) are only guaranteed at ≥2.5V supply, making 100 kHz the design limit for true 1.8V systems. AT24C32N-10SC-1.8 maintains timing compliance across its full industrial temperature range (-40°C to +85°C) at this speed.

Does AT24C32N-10SC-1.8 require external pull-up resistors on SDA and SCL lines?

Yes, AT24C32N-10SC-1.8 requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. The datasheet specifies typical values of 2.2 kΩ to 10 kΩ depending on bus capacitance and speed requirements. Without these resistors, the bus cannot achieve valid HIGH logic levels, and AT24C32N-10SC-1.8 will not respond to I²C commands. Pull-ups must connect to the same VCC rail used by the EEPROM.

How does the WP pin function on AT24C32N-10SC-1.8, and what happens if it is left unconnected?

On AT24C32N-10SC-1.8, the WP (Write Protect) pin disables writes to the upper quadrant (8K bits) when driven HIGH to VCC. When left unconnected, an internal pull-down resistor biases WP to GND, enabling full memory write access. This behavior is confirmed in the Pin Description section and eliminates risk of accidental lockout during prototyping. AT24C32N-10SC-1.8 does not support partial-page or byte-level software write protection - only hardware quadrant-level protection via WP.

What is the memory organization of AT24C32N-10SC-1.8, and how does page write mode work?

AT24C32N-10SC-1.8 organizes its 32K-bit memory as 256 pages of 32 bytes each. In page write mode, after sending the starting address, the host can transmit up to 32 sequential bytes before issuing a STOP condition. The EEPROM automatically increments the lower 5 address bits; exceeding 32 bytes causes rollover within the same page. This reduces I²C transaction count versus byte writes - a key efficiency gain for AT24C32N-10SC-1.8 in firmware update routines.

Is AT24C32N-10SC-1.8 qualified for industrial temperature operation?

Yes, AT24C32N-10SC-1.8 is rated for industrial temperature operation from -40°C to +85°C, as indicated by the "I" suffix in its ordering code variant (e.g., AT24C32N-10SI-1.8). The "SC" in AT24C32N-10SC-1.8 denotes SOIC packaging, and the "-1.8" suffix confirms 1.8V–5.5V operation. All electrical specifications - including 100 kHz I²C timing, 0.1 µA standby current, and write cycle time - are guaranteed across this full industrial range, per the DC and AC Characteristics tables.