Microchip Technology AT24C04C-CUM-T

Overview

AT24C04C-CUM-T from Microchip Technology is a 4-Kbit I²C-compatible serial EEPROM organized as 512 × 8 bits, operating from 1.7V to 5.5V with industrial temperature range (–40°C to +85°C), supporting 100 kHz/400 kHz/1 MHz I²C modes, and featuring hardware write-protection via the WP pin - used for nonvolatile configuration storage in microcontroller-based embedded systems.

For engineers reviewing the AT24C04C-CUM-T datasheet, AT24C04C-CUM-T pinout, AT24C04C-CUM-T application, or AT24C04C-CUM-T equivalent, key selection considerations include its 8-pin UDFN package, 16-byte page write capability, 5 ms max self-timed write cycle, 1,000,000 write endurance, and compatibility with I²C bus hosts requiring low-voltage, low-power, and robust noise immunity in space-constrained designs.

Technical Context

The AT24C04C-CUM-T implements a two-wire I²C interface with Schmitt-triggered, filtered SDA and SCL inputs for noise suppression, and supports bidirectional data transfer with ACK/NACK handshaking on every byte. Its internal address comparator decodes device addresses using A1/A2 pins, enabling up to four devices on one bus.

It features an integrated power-on reset (POR) circuit with 100 µs tPUP delay, internal pull-downs on A1, A2, and WP (disengaging above ~0.5×VCC), and a high-voltage generation circuit for EEPROM cell programming - all managed by a system control module coordinating column/row decoding and write protection logic.

Key Specifications

Pinout & Package

AT24C04C-CUM-T is supplied in an 8-pad UDFN (Ultra Thin Dual Flat No-lead) package, 2.0 mm × 1.6 mm × 0.55 mm, with wettable flank leads and RoHS-compliant, halide-free construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C04C-CUM-T, the M24C04-RMN6TP trades miniaturization for broader manufacturing compatibility, while the CAT24C04HU4I-GT3 matches the UDFN form factor but extends thermal capability - making the latter a drop-in replacement only when higher temperature operation is needed.

Availability

AT24C04C-CUM-T is available at Aetrix Electronics and suitable for smart sensor nodes, industrial PLC modules, medical wearables, and consumer IoT hubs requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for AT24C04C-CUM-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 is a global semiconductor company specializing in microcontrollers, analog, FPGA, and memory solutions, with a focus on reliability, longevity, and embedded system integration.

The AT24C04C-CUM-T belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for low-voltage, low-power, and space-constrained embedded applications demanding high endurance and data integrity.

FAQ

What is the package type and dimensions of the AT24C04C-CUM-T?

The AT24C04C-CUM-T uses an 8-pad UDFN (Ultra Thin Dual Flat No-lead) package measuring 2.0 mm × 1.6 mm × 0.55 mm with wettable flank leads. This compact, surface-mount footprint supports automated optical inspection and is optimized for high-density PCB layouts where board space is constrained. The exposed pad may be left floating or connected to GND per design requirements.

Does the AT24C04C-CUM-T support 1 MHz I²C communication?

Yes, the AT24C04C-CUM-T supports Fast Mode Plus (FM+) at up to 1 MHz - but only when VCC is 2.5V or higher. At 1.7V–2.5V, it operates up to 400 kHz. This dual-speed capability allows designers to maximize throughput in 3.3V/5V systems while maintaining compatibility with lower-voltage domains, all without changing firmware I²C timing configurations.

How does the write-protect (WP) pin function on the AT24C04C-CUM-T?

When the WP pin is driven high (to VCC), the AT24C04C-CUM-T inhibits all write operations to its entire memory array - providing hardware-level protection against accidental or malicious overwrites. If left floating, the pin is internally pulled down to GND (enabling writes), but Microchip recommends tying it explicitly to VCC or GND to avoid noise-induced state ambiguity in real-world PCB layouts.

What is the maximum write cycle time for the AT24C04C-CUM-T?

The AT24C04C-CUM-T has a maximum self-timed write cycle time of 5 ms, covering both byte and page writes. This value is guaranteed across the full operating voltage and temperature range (–40°C to +85°C). Host systems can use ACK polling to detect write completion, eliminating the need for fixed delays and improving overall bus efficiency during frequent small writes.

Is the AT24C04C-CUM-T compatible with other AT24Cxx devices on the same I²C bus?

Yes - the AT24C04C-CUM-T uses the standard I²C device address prefix '1010' and supports hardware address inputs A1 and A2, allowing up to four AT24C04C devices (or mixed AT24C04C/AT24C08C with proper addressing) on a single bus. Its 7-bit slave address is configurable as 0x50–0x53, ensuring interoperability with existing I²C infrastructure and host drivers designed for the AT24Cxx family.