Microchip Technology AT24C01D-STUM-T

Overview

AT24C01D-STUM-T from Microchip Technology is a 1-Kbit (128 × 8) I²C-compatible serial EEPROM in an 8-pad UDFN package, operating from 1.7V to 3.6V with industrial temperature range (−40°C to +85°C), 1 MHz Fast Mode Plus support, and hardware write protection via WP pin - used for nonvolatile configuration storage in microcontroller-based sensor nodes and power management systems.

For engineers reviewing the AT24C01D-STUM-T datasheet, AT24C01D-STUM-T pinout, AT24C01D-STUM-T application, or AT24C01D-STUM-T equivalent, key selection considerations include voltage compatibility (1.7–3.6 V), I²C bus speed mode support (Standard/Fast/Fast Mode Plus), page write capability (8-byte pages), write endurance (1M cycles), and UDFN-8 footprint constraints.

Technical Context

The AT24C01D-STUM-T implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and internal pull-downs on A0/A1/A2/TP pins. It supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) timing at defined VCC ranges, with ACK/NACK protocol compliance and software reset recovery.

Memory is organized as 16 pages of 8 bytes each (128 × 8), enabling partial page writes and sequential/random reads. Write protection is controlled by the WP pin: tied to VCC disables all writes; tied to GND enables full-array writes. Internal high-voltage generation enables self-timed erase/write within ≤5 ms.

Key Specifications

Pinout & Package

AT24C01D-STUM-T is housed in an 8-pad UDFN (Ultra Thin Dual Flat No-lead) package with wettable flanks, measuring 2.0 mm × 1.6 mm × 0.55 mm, suitable for space-constrained PCB layouts and automated optical inspection (AOI).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C01C-SSHM-T, the AT24C01D-STUM-T offers 35% smaller PCB area and improved thermal performance in sealed enclosures; versus M24C01-RMN6TP, it delivers tighter low-voltage operation (1.7 V min) and native compatibility with 1.8 V I/O domains, though lacks 5 V tolerance.

Availability

AT24C01D-STUM-T is available at Aetrix Electronics and suitable for smart metering, industrial PLC I/O modules, and medical sensor pods requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for AT24C01D-STUM-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified manufacturing and global distribution.

The AT24CxxD series targets cost-sensitive, low-power embedded systems needing reliable nonvolatile storage - designed specifically for industrial, medical, and consumer applications where voltage flexibility and small form factor are critical.

FAQ

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

The AT24C01D-STUM-T supports up to 1 MHz in Fast Mode Plus, but only when VCC is between 2.5 V and 3.6 V. At lower voltages (1.7–3.6 V), it operates at 400 kHz (Fast Mode) or 100 kHz (Standard Mode). This tiered speed support ensures timing compliance across its full voltage range without external clock dividers or level shifters.

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

Yes, the AT24C01D-STUM-T requires external pull-up resistors on both SDA and SCL lines because its I²C interface uses open-drain outputs. Microchip specifies maximum values of 10 kΩ for SDA and recommends 1.3 kΩ for 1 MHz operation. The exact value depends on bus capacitance and desired rise time - typical designs use 4.7 kΩ for 400 kHz buses with ≤200 pF load.

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

The WP pin on the AT24C01D-STUM-T disables all write operations when driven high (to VCC), protecting the entire memory array from accidental modification. When pulled low (to GND), normal byte and page writes are enabled. If left floating, the pin is internally pulled down - but Microchip recommends hard-wiring WP to avoid noise-induced state transitions in noisy environments.

What is the memory organization of the AT24C01D-STUM-T?

The AT24C01D-STUM-T organizes its 1,024 bits as 128 words of 8 bits each, grouped into 16 pages of 8 bytes. This structure enables efficient page writes (up to 8 bytes per cycle) and supports both random and sequential read modes. Addressing uses a 7-bit I²C slave address (1010xxx) plus 7-bit memory word address, allowing full array access without bank switching.

Is the AT24C01D-STUM-T compatible with standard I²C protocol stacks?

Yes, the AT24C01D-STUM-T is fully compliant with the NXP I²C-bus specification, including Start/Stop conditions, ACK/NACK handshaking, and 7-bit addressing. It supports standard I²C software drivers (e.g., Linux i2c-dev, STM32 HAL_I2C, Arduino Wire) without modification - provided timing parameters (tLOW, tHIGH, tSU.STA, etc.) are respected per the datasheet's AC characteristics table.