Microchip Technology AT24CM01-SSHM-B

Overview

AT24CM01-SSHM-B from Microchip Technology is a 1-Mbit (131,072 × 8) I²C-compatible serial EEPROM optimized for low-voltage industrial applications. It operates from 1.7V to 5.5V, supports 1 MHz Fast Mode Plus (FM+) at ≥2.5V, delivers ultra-low standby current (6 µA max), and features hardware write protection via the WP pin. It is commonly used in embedded systems for storing calibration data, configuration parameters, and firmware metadata.

For engineers reviewing the AT24CM01-SSHM-B datasheet, AT24CM01-SSHM-B pinout, AT24CM01-SSHM-B application, or AT24CM01-SSHM-B equivalent, key selection criteria include voltage range compatibility (1.7–5.5V), FM+ timing compliance (1 MHz @ 2.5–5.5V), page-write capability (256-byte pages), built-in error detection/correction, and industrial temperature support (−40°C to +85°C).

Technical Context

The AT24CM01-SSHM-B implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and open-drain bidirectional data transfer. Its internal architecture includes a 512-page × 256-byte memory array, hardware address inputs (A1/A2) enabling up to four devices on one bus, and a dedicated Write-Protect (WP) pin that disables all writes when pulled high.

It uses an integrated power-on reset (POR) circuit with VPOR = 1.5 V and requires tPUP ≥ 100 µs after VCC stabilization before accepting commands. All write operations are self-timed with ≤5 ms completion and include built-in error detection and correction - critical for robust data integrity in mission-critical storage.

Key Specifications

Pinout & Package

AT24CM01-SSHM-B is supplied in an 8-lead SOIC package (3.9 mm × 4.9 mm), RoHS-compliant and halide-free. Pin functions are electrically identical across SOIC, TSSOP, SOIJ, and WLCSP variants per Microchip's datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C1024-SSHM-T, the AT24CM01-SSHM-B adds 1 MHz FM+ and 1.7V operation for next-gen low-power controllers; versus M95M01-RDW6TP, it preserves I²C simplicity and hardware WP - reducing validation effort in existing two-wire architectures.

Availability

AT24CM01-SSHM-B is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and smart energy meter firmware metadata storage requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AT24CM01-SSHM-B 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 AT24CM01-SSHM-B belongs to Microchip's AT24C-series serial EEPROM product line, designed specifically for reliable, low-voltage, I²C-based nonvolatile storage in industrial, medical, and automotive applications demanding extended data retention and high endurance.

FAQ

What is the minimum operating voltage for the AT24CM01-SSHM-B?

The AT24CM01-SSHM-B supports true low-voltage operation down to 1.7V across its full industrial temperature range (−40°C to +85°C). This enables direct use with 1.8V logic families and battery-powered systems where supply rails dip below 2.5V, unlike older EEPROMs limited to 2.5V minimum. The AT24CM01-SSHM-B maintains full I²C functionality-including 100 kHz and 400 kHz modes-at 1.7V.

Does the AT24CM01-SSHM-B support 1 MHz I²C communication?

Yes, the AT24CM01-SSHM-B supports Fast Mode Plus (FM+) at up to 1 MHz-but only when VCC is 2.5V or higher. At 1.7–2.4V, it operates in Standard (100 kHz) or Fast (400 kHz) mode. This dual-speed capability allows designers to maximize throughput in 3.3V/5V systems while retaining compatibility with low-voltage subsystems. The AT24CM01-SSHM-B meets all FM+ timing requirements per Figure 4-1 and Table 4-3 of its datasheet.

How does the Write-Protect (WP) pin function on the AT24CM01-SSHM-B?

The WP pin on the AT24CM01-SSHM-B provides hardware-level write inhibition: when pulled high to VCC, it disables all write operations (byte, page, and erase) across the entire memory array. When pulled low or left floating (internally pulled down), writes are enabled. Microchip recommends hardwiring WP to a known state-especially in noisy environments-to prevent spurious writes. This feature is integral to the AT24CM01-SSHM-B's robustness in safety-critical applications.

What is the memory organization of the AT24CM01-SSHM-B?

The AT24CM01-SSHM-B organizes its 1,048,576 bits as 131,072 words × 8 bits, segmented into 512 pages of 256 bytes each. This structure enables efficient 256-byte page writes and supports both random and sequential read modes. Addressing uses a 17-bit word address (A16–A0), with A2/A1 pins selecting the upper two bits of the device address-allowing up to four AT24CM01-SSHM-B devices on a single I²C bus without address conflict.

Is the AT24CM01-SSHM-B compatible with standard AT24C-series I²C protocols?

Yes, the AT24CM01-SSHM-B maintains full protocol compatibility with the AT24C family: it uses the same 1010xxxR/W device address format, supports Start/Stop conditions, ACK/NACK handshaking, and current-address, random, and sequential read modes. However, it extends functionality with FM+ timing, lower voltage operation, and enhanced error detection-making it a functional superset, not just a drop-in replacement, for legacy AT24C1024 designs.