Microchip Technology AT24C01D-SSHM-T

Overview

AT24C01D-SSHM-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), 100/400/1000 kHz I²C interface support, and hardware write protection via WP pin - used for nonvolatile parameter storage in microcontroller-based sensor nodes and power management subsystems.

For engineers reviewing the AT24C01D-SSHM-T datasheet, AT24C01D-SSHM-T pinout, AT24C01D-SSHM-T application, or AT24C01D-SSHM-T equivalent, key selection considerations include low-voltage operation down to 1.7V, 8-byte page write capability with ≤5 ms self-timed write cycle, ultra-low standby current (≤0.8 μA), Schmitt-triggered noise-immune inputs, and hardware address flexibility via A0–A2 pins.

Technical Context

The AT24C01D-SSHM-T functions as an I²C slave device with fixed 7-bit device address prefix 1010b and three programmable hardware address bits (A0–A2), enabling up to eight devices on a shared bus. It implements a two-wire serial interface compliant with I²C Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) specifications under defined VCC conditions.

Internally, it uses a high-voltage generation circuit for EEPROM cell programming, a hardware address comparator for slave selection, and a power-on reset (POR) circuit ensuring reliable initialization at VCC ≥ 1.5 V with tPUP ≥ 100 µs delay before first command. Memory is organized into 16 pages of 8 bytes each, supporting random and sequential read modes plus byte/page write operations with acknowledge polling.

Key Specifications

Pinout & Package

AT24C01D-SSHM-T is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with standard 150-mil body width and gull-wing leads. This surface-mount package supports automated assembly and offers thermal and mechanical reliability for industrial PCB environments.

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-SSHM-T adds industrial temperature support and identical low-voltage capability; versus M24C01-RMN6TP, it delivers faster I²C throughput and lower VCC headroom - making it optimal for thermally demanding, power-constrained embedded systems requiring guaranteed performance margins.

Availability

AT24C01D-SSHM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and IoT edge node state backup requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for AT24C01D-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 leading provider of microcontrollers, analog components, and memory solutions, with a focus on embedded control and connectivity.

The AT24C01D-SSHM-T belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for reliable, low-power nonvolatile data storage in resource-constrained microcontroller systems across industrial, automotive, and consumer markets.

FAQ

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

The AT24C01D-SSHM-T supports I²C Standard Mode (100 kHz), Fast Mode (400 kHz), and Fast Mode Plus (1000 kHz). Fast Mode Plus operation requires VCC ≥ 2.5V; below that, only Standard and Fast Modes are guaranteed per datasheet DS20006100A.

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

Yes, the AT24C01D-SSHM-T requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is an input. Recommended values are ≤10 kΩ for SDA; exact value depends on bus capacitance and target I²C speed - e.g., 4 kΩ for 400 kHz, 1.3 kΩ for 1 MHz.

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

When the WP pin is driven high (to VCC), the AT24C01D-SSHM-T inhibits all write operations to its entire memory array. When WP is low (GND), normal read/write access is enabled. If left floating, WP is internally pulled down, enabling writes - but Microchip recommends hardwiring WP to a known state for reliability.

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

The AT24C01D-SSHM-T is organized as 128 words of 8 bits each (1,024 total bits), arranged in 16 pages of 8 bytes. This structure enables efficient 8-byte page writes and supports both random and sequential read operations without address wraparound limitations.

Is the AT24C01D-SSHM-T compatible with 1.8V microcontrollers?

Yes, the AT24C01D-SSHM-T operates from 1.7V to 3.6V and is fully compatible with 1.8V microcontrollers. Its I²C interface meets Standard and Fast Mode specifications at 1.8V, and its input thresholds (VIL ≤ 0.3×VCC, VIH ≥ 0.7×VCC) ensure robust logic-level interoperability without level shifters.