Microchip Technology AT24C01C-SSHM-T

Overview

AT24C01C-SSHM-T from Microchip Technology is a 1-Kbit I²C-compatible serial EEPROM organized as 128 × 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 WP pin - used for nonvolatile parameter storage in embedded controllers, sensor calibration modules, and power management ICs.

For engineers reviewing the AT24C01C-SSHM-T datasheet, AT24C01C-SSHM-T pinout, AT24C01C-SSHM-T application, or AT24C01C-SSHM-T equivalent, key selection criteria include its 1.7V low-voltage operation, 8-byte page write capability, 5 ms max self-timed write cycle, 1 M write-cycle endurance, and compatibility with space-constrained SOIC-8 layouts.

Technical Context

The AT24C01C-SSHM-T implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and internal pull-downs on A0–A2 and WP pins. It uses a cascaded address architecture allowing up to eight devices on one bus via hard-wired A0/A1/A2 inputs.

Memory is organized into 16 pages of 8 bytes each, supporting byte-write, page-write (with partial-page capability), random read, and sequential read. Write protection is enforced at the hardware level when WP = VCC, inhibiting all writes to the full 128-byte array.

Key Specifications

Pinout & Package

AT24C01C-SSHM-T is supplied in an 8-lead SOIC package (SOIC-8, 150 mil width), with gull-wing leads and standard JEDEC MS-012AC footprint. 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 AT24C01C-SSHM-T, AT24C01D-SSHM-T delivers faster write timing and higher ESD tolerance in identical packaging, while M24C01-RMN6TP trades 0.1V lower VCC min for tighter 1.8V optimization and different AC timing behavior below 2.5V - both require validation of WP functionality and page-write timing in target firmware.

Availability

AT24C01C-SSHM-T is available at Aetrix Electronics and suitable for industrial sensor nodes, smart meter calibration storage, and embedded controller bootloader configuration requiring stable component supply across multi-year production cycles.

Supply support for AT24C01C-SSHM-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 AT24C01C-SSHM-T belongs to Microchip's legacy AT24Cxx serial EEPROM family, designed for cost-sensitive, low-power, and space-constrained applications requiring reliable nonvolatile storage in industrial, automotive, and consumer systems.

FAQ

What is the maximum I²C clock frequency supported by AT24C01C-SSHM-T?

The AT24C01C-SSHM-T supports three I²C speed modes: 100 kHz (Standard Mode) across 1.7–5.5V, 400 kHz (Fast Mode) across 1.7–5.5V, and 1 MHz (Fast Mode Plus) only at VCC ≥ 2.5V. Its AC characteristics specify tLOW/tHIGH timing margins for each mode, ensuring interoperability with standard I²C masters without protocol modification. The 1 MHz capability enables faster configuration loads in time-critical boot sequences.

Does AT24C01C-SSHM-T require external pull-up resistors on SDA and SCL lines?

Yes, AT24C01C-SSHM-T requires external pull-up resistors on both SDA and SCL lines because SDA is open-drain and SCL is a CMOS input. Microchip specifies maximum values of 10 kΩ for pull-ups, with recommended values of 4 kΩ for 400 kHz operation and 1.3 kΩ for 1 MHz Fast Mode Plus. The resistor value must be selected based on bus capacitance and desired rise time to meet tR ≤ 300 ns per the datasheet's AC specifications.

How does the write-protect (WP) pin function on AT24C01C-SSHM-T?

On AT24C01C-SSHM-T, the WP pin provides hardware-level write inhibition: when driven to VCC, it disables all write operations (byte, page, and erase) to the entire 128-byte memory array. When grounded, normal writes are enabled. If left floating, the internal strong pull-down asserts WP = GND, enabling writes - but Microchip recommends hard-wiring WP to a defined state to prevent noise-induced glitches in industrial environments.

What is the memory organization of AT24C01C-SSHM-T and how does it affect page writes?

AT24C01C-SSHM-T organizes its 128 bytes into 16 pages of 8 bytes each. Page write mode allows up to 8 sequential bytes to be written in a single I²C transaction, provided all addresses fall within the same 8-byte boundary (e.g., addresses 0x00–0x07). Crossing a page boundary triggers automatic wraparound to the start of the same page, limiting effective burst size - this constrains firmware logic to align writes or split across boundaries, directly impacting update efficiency in configuration storage.

Is AT24C01C-SSHM-T compatible with 1.8V microcontrollers?

Yes, AT24C01C-SSHM-T is fully compatible with 1.8V microcontrollers: its guaranteed operating range starts at 1.7V, and its I²C interface meets Standard and Fast Mode timing at 1.8V (tLOW ≥ 1200 ns, tHIGH ≥ 600 ns). Input thresholds (VIL ≤ 0.3×VCC, VIH ≥ 0.7×VCC) ensure reliable logic recognition, and its 6 μA standby current avoids loading weak 1.8V rails - making it suitable for battery-powered IoT endpoints using ARM Cortex-M0+ or RISC-V MCUs.