Microchip Technology AT24C02C-SSHM-B

Overview

AT24C02C-SSHM-B from Microchip Technology is a 2-Kbit I²C-compatible serial EEPROM organized as 256 × 8 bits, operating from 1.7V to 5.5V with industrial temperature range (−40°C to +85°C), supporting 1 MHz Fast Mode Plus, and featuring hardware write-protection via the WP pin for use in embedded system configuration storage.

For engineers reviewing the AT24C02C-SSHM-B datasheet, AT24C02C-SSHM-B pinout, AT24C02C-SSHM-B application, or AT24C02C-SSHM-B equivalent, key selection criteria include I²C bus compatibility up to 1 MHz, 8-byte page write capability, 1,000,000 write endurance, ultra-low standby current (6 μA max), and SOIC-8 package pinout with A0–A2 address inputs.

Technical Context

The AT24C02C-SSHM-B implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) timing modes depending on VCC level. It uses an internal high-voltage generation circuit for EEPROM programming and includes a Power-on Reset (POR) circuit with 100 µs tPUP delay.

Memory is organized into 32 pages of 8 bytes each, enabling partial page writes and sequential reads. Device addressing uses hard-wired A0–A2 pins (or internal pull-down in floating state) to support up to eight devices on one bus, with a fixed 4-bit device type identifier (1010b) and R/W bit.

Key Specifications

Pinout & Package

AT24C02C-SSHM-B is supplied in an 8-lead SOIC (Small Outline Integrated Circuit) package with standard 1.27 mm pitch and gull-wing leads. The package is RoHS-compliant, halide-free, and green-marked.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C02-RMN6TP and BR24G02FJ-3GE2, the AT24C02C-SSHM-B uniquely combines 1 MHz Fast Mode Plus support, hardware WP pin, and guaranteed 100-year data retention - making it optimal for high-reliability, high-throughput embedded systems requiring both speed and tamper resistance.

Availability

AT24C02C-SSHM-B is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, IoT sensor nodes, medical diagnostics, and automotive body electronics requiring stable component supply and long-term lifecycle support.

Supply support for AT24C02C-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 Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, with global manufacturing and quality certifications including ISO 9001 and AEC-Q200 for automotive-grade components.

The AT24Cxx series is designed specifically for robust, low-power I²C-based nonvolatile storage in industrial, automotive, and consumer applications - emphasizing reliability, wide voltage operation, and noise-immune communication.

FAQ

What is the maximum I²C clock frequency supported by the AT24C02C-SSHM-B?

The AT24C02C-SSHM-B supports up to 1 MHz Fast Mode Plus operation when VCC is 2.5V or higher. At 1.7V–2.5V, it operates at up to 400 kHz Fast Mode. This dual-speed capability allows designers to maximize throughput in 3.3V/5V systems while maintaining compatibility with 1.8V interfaces. The AT24C02C-SSHM-B's timing compliance is verified per I²C-bus specification Rev. 6.

Does the AT24C02C-SSHM-B require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C02C-SSHM-B requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is an input-only pin. Recommended values are ≤10 kΩ for SDA; exact value depends on bus capacitance and target speed (e.g., 4 kΩ for 400 kHz, 1.3 kΩ for 1 MHz). The AT24C02C-SSHM-B does not integrate internal pull-ups.

How does the Write-Protect (WP) pin function on the AT24C02C-SSHM-B?

When the WP pin of the AT24C02C-SSHM-B is driven high (to VCC), all write operations to the entire memory array are inhibited - providing hardware-level protection against accidental or malicious overwrites. When WP is grounded, normal read/write operations proceed. If left unconnected, the pin is internally pulled down, enabling writes by default - though Microchip recommends explicit biasing for reliability.

What is the memory organization of the AT24C02C-SSHM-B?

The AT24C02C-SSHM-B organizes its 2-Kbit capacity as 256 words of 8 bits each, arranged in 32 pages of 8 bytes. This structure enables efficient 8-byte page writes and supports both random and sequential read modes. The AT24C02C-SSHM-B uses a 7-bit word address for internal addressing, allowing direct access to any byte location without page boundary constraints.

Is the AT24C02C-SSHM-B compatible with standard I²C protocol implementations?

Yes, the AT24C02C-SSHM-B is fully compliant with the NXP I²C-bus specification, supporting Start/Stop conditions, ACK/NACK handshaking, 7-bit slave addressing (with A0–A2 hardware bits), and standard read/write protocols including current-address, random, and sequential reads. Its Schmitt-triggered inputs and noise filtering ensure interoperability with diverse I²C masters, including ARM Cortex-M and PIC microcontrollers.