Microchip Technology AT24C01D-CUM-T

Overview

AT24C01D-CUM-T from Microchip Technology is a 1-Kbit I²C-compatible serial EEPROM organized as 128 × 8 bits, operating from 1.7V to 3.6V with industrial temperature range (−40°C to +85°C), 1 MHz Fast Mode Plus support at 2.5–3.6V, and hardware write protection via WP pin - used for nonvolatile configuration storage in embedded microcontroller systems.

For engineers reviewing the AT24C01D-CUM-T datasheet, AT24C01D-CUM-T pinout, AT24C01D-CUM-T application, or AT24C01D-CUM-T equivalent, key selection considerations include low-voltage operation, page-write capability (8-byte pages), 1,000,000 write endurance, 100-year data retention, and compatibility with multi-device I²C bus topologies using A0/A1/A2 address inputs.

Technical Context

The AT24C01D-CUM-T functions as an I²C slave device with fixed 7-bit device address prefix 1010b and three programmable hardware address bits (A0, A1, A2), enabling up to eight devices on a shared bus. It implements Schmitt-triggered, filtered SDA/SCL inputs for noise immunity and supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) timing modes depending on VCC level.

Internally, it uses a high-voltage generation circuit for EEPROM programming, a hardware write-protection comparator tied to the WP pin, and a power-on reset (POR) circuit with 1.5V threshold and 100 µs tPUP delay. Memory is arranged in 16 pages of 8 bytes each, supporting both random and sequential read, byte write, and partial page write operations.

Key Specifications

Pinout & Package

AT24C01D-CUM-T is supplied in an 8-lead UDFN package (2.0 mm × 1.6 mm, 0.5 mm pitch) with wettable flanks, RoHS-compliant and halide-free. The exposed pad is internally connected to GND and may be soldered to PCB ground plane for thermal and electrical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01C-SSHM-T and M24C01-RMN6TP, AT24C01D-CUM-T delivers superior low-voltage operation (down to 1.7V), faster 1 MHz I²C throughput in 3.3V systems, and lower standby current - making it optimal for modern compact, battery-aware embedded platforms.

Availability

AT24C01D-CUM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and smart energy meter firmware requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for AT24C01D-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 leading provider of microcontrollers, analog, FPGA, and memory solutions, serving industrial, automotive, communications, and consumer markets with vertically integrated silicon and development tools.

The AT24C01D-CUM-T belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for low-power, space-constrained embedded systems requiring reliable nonvolatile storage with minimal external components and broad voltage compatibility.

FAQ

What is the maximum I²C clock frequency supported by the AT24C01D-CUM-T?

The AT24C01D-CUM-T supports 100 kHz in Standard mode (1.7–3.6V), 400 kHz in Fast mode (1.7–3.6V), and 1 MHz in Fast Mode Plus (2.5–3.6V). Operation above 400 kHz requires VCC ≥ 2.5V and adherence to tighter AC timing specs including tR/tF ≤100 ns. The 1 MHz capability reduces configuration load time in high-throughput systems.

How does the write-protect (WP) pin function on the AT24C01D-CUM-T?

When the WP pin is driven high (to VCC), the AT24C01D-CUM-T inhibits all write operations to its entire memory array - including byte, page, and erase commands. If left unconnected, WP is internally pulled down to GND, enabling normal writes. Microchip recommends hard-wiring WP to a known state (GND or VCC) to prevent noise-induced corruption during power transitions.

Can the AT24C01D-CUM-T be used with a 5V microcontroller I²C bus?

No - the AT24C01D-CUM-T is rated for 1.7V to 3.6V VCC and I/O tolerance; direct connection to a 5V I²C bus will exceed absolute maximum ratings and risk permanent damage. Level translation (e.g., TXS0102 or discrete MOSFET buffers) is required for interoperability with 5V masters, or select the AT24C01C-SSHM-T (1.8–5.5V) instead.

What is the memory organization and page structure of the AT24C01D-CUM-T?

The AT24C01D-CUM-T contains 1,024 bits organized as 128 words of 8 bits each, grouped into 16 pages of 8 bytes. This structure enables efficient 8-byte page writes (max 5 ms) and supports partial-page writes - allowing updates to sub-8-byte fields without erasing adjacent data, critical for preserving configuration integrity during field updates.

Does the AT24C01D-CUM-T require external pull-up resistors on SDA and SCL lines?

Yes - both SDA and SCL are open-drain signals requiring external pull-up resistors to VCC. Microchip specifies maximum values of 10 kΩ for SDA and recommends 1.3 kΩ (1 MHz), 4 kΩ (400 kHz), or 10 kΩ (100 kHz) for SCL depending on bus speed and capacitance. Incorrect pull-up values cause timing violations or bus lockup.