Microchip Technology AT24C04-10PC-1.8

Overview

AT24C04-10PC-1.8 from Microchip Technology (formerly Atmel) is a 4K-bit (512 × 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. It is used in battery-powered IoT sensors for nonvolatile configuration storage.

For engineers reviewing the AT24C04-10PC-1.8 datasheet, AT24C04-10PC-1.8 pinout, AT24C04-10PC-1.8 application, or AT24C04-10PC-1.8 equivalent, key selection criteria include 1.8V minimum supply compatibility, 16-byte page write capability, SOIC-8 package footprint, and hardware write-protect functionality in space-constrained industrial control modules.

Technical Context

The AT24C04-10PC-1.8 implements a two-wire I²C interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and open-drain bidirectional data transfer. Its internal memory is organized as 32 pages of 16 bytes each, requiring a 9-bit word address for random access.

Device addressing uses A2 and A1 pins (A0 is NC), enabling up to four AT24C04 devices on one bus. Write protection is controlled by the WP pin: tied to GND for full read/write access, tied to VCC to lock the entire 4K array against writes.

Key Specifications

Pinout & Package

AT24C04-10PC-1.8 is supplied in an 8-lead JEDEC-standard SOIC package (8S1), 3.9 mm × 4.9 mm body, 1.27 mm pitch, with gull-wing leads. Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C04-10PI-1.8, the AT24C04-10PC-1.8 offers lower cost for commercial-temperature applications, while M24C04-RMN6TP provides alternate sourcing with identical layout compatibility but trade-offs in write cycle lifetime and data retention duration.

Availability

AT24C04-10PC-1.8 is available at Aetrix Electronics and suitable for smart meter calibration storage, industrial PLC configuration backup, and medical sensor serial numbering requiring stable component supply across multi-year production cycles.

Supply support for AT24C04-10PC-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 components, and memory solutions, with deep expertise in embedded control and secure data storage.

The AT24C04-10PC-1.8 belongs to Microchip's legacy serial EEPROM product line, designed specifically for reliable, low-voltage nonvolatile data retention in resource-constrained embedded systems.

FAQ

What is the maximum I²C clock frequency supported by AT24C04-10PC-1.8 at 1.8V?

The AT24C04-10PC-1.8 supports up to 100 kHz I²C clock frequency when operated at 1.8V supply. This is specified in the AC Characteristics table under fSCL for 1.8V operation. Higher frequencies (e.g., 400 kHz) require ≥4.5V supply and are not guaranteed at 1.8V. The AT24C04-10PC-1.8 maintains timing compliance across its full 1.8V–5.5V range, with appropriate derating below 2.5V.

Is AT24C04-10PC-1.8 pin-compatible with other AT24Cxx variants in SOIC-8 package?

Yes, AT24C04-10PC-1.8 shares identical SOIC-8 pinout and I²C interface behavior with AT24C01A, AT24C02, AT24C08, and AT24C16 in the same package. However, memory size, page length (16 bytes for AT24C04 vs. 8 bytes for AT24C02), and device addressing (A0 is NC on AT24C04 but functional on AT24C02) differ - firmware must be adapted accordingly. The AT24C04-10PC-1.8 remains electrically interoperable at the bus level.

How does the Write Protect (WP) pin function on AT24C04-10PC-1.8?

On AT24C04-10PC-1.8, the WP pin is active-high: when tied to VCC, it locks the entire 4K memory array against all write operations (byte, page, and erase); when grounded, full read/write access is enabled. Unlike software locks, this hardware protection persists across power cycles and cannot be overridden by I²C commands. The AT24C04-10PC-1.8 implements this at silicon level for robust security in field-deployed devices.

What is the memory organization of AT24C04-10PC-1.8?

The AT24C04-10PC-1.8 contains 4096 bits organized as 512 words of 8 bits each, internally structured as 32 pages of 16 bytes. This requires a 9-bit word address for random access. Page boundaries align every 16 bytes, enabling efficient 16-byte burst writes without crossing page limits - a key optimization implemented in the AT24C04-10PC-1.8 architecture.

Does AT24C04-10PC-1.8 support partial page writes?

Yes, AT24C04-10PC-1.8 supports partial page writes: the host may transmit fewer than 16 bytes in a single page write sequence, and the EEPROM will accept them without error. Remaining bytes in the page retain their prior values. This capability is explicitly confirmed in the "Features" section and applies identically across all AT24C04-10PC-1.8 operating voltages, including 1.8V. The AT24C04-10PC-1.8 handles address incrementing automatically within the active page.