Microchip Technology AT24C02D-SSHM-B

Overview

AT24C02D-SSHM-B from Microchip Technology is a 2-Kbit (256 × 8) I²C-compatible serial EEPROM in 8-lead SOIC 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 embedded microcontroller systems.

For engineers reviewing the AT24C02D-SSHM-B datasheet, AT24C02D-SSHM-B pinout, AT24C02D-SSHM-B application, or AT24C02D-SSHM-B equivalent, key selection considerations include I²C bus voltage compatibility (1.7–3.6V), page-write capability (8-byte pages), write endurance (1M cycles), data retention (100 years), and hardware write-protect functionality.

Technical Context

The AT24C02D-SSHM-B operates as an I²C slave device with fixed 7-bit address prefix 1010b and three programmable address bits (A2–A0), enabling up to eight devices on one bus. It implements Schmitt-triggered, filtered SDA/SCL inputs for noise immunity and supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) timing modes depending on VCC level.

Internally organized as 32 pages of 8 bytes each, it uses a self-timed write cycle (≤5 ms), supports random/sequential reads, and features active current ≤1 mA and standby current ≤0.8 μA. The WP pin provides full-array hardware write protection when driven high.

Key Specifications

Pinout & Package

AT24C02D-SSHM-B is supplied in an 8-lead SOIC package (SOIC-8, 150 mil width). Pin functions are standardized across SOIC, TSSOP, PDIP, UDFN, and VFBGA variants per Microchip DS20006100A.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24C02-RMN6TP and BR24G02NUX-10, the AT24C02D-SSHM-B delivers optimal balance of 1 MHz speed, ultra-low 1.7V operation, and hardware WP simplicity - making it ideal for cost-sensitive, low-power industrial MCU platforms where deterministic write protection is critical.

Availability

AT24C02D-SSHM-B is available at Aetrix Electronics and suitable for industrial sensor nodes, smart metering endpoints, and medical handheld devices requiring stable component supply, long-lifecycle assurance, and RoHS-compliant green packaging.

Supply support for AT24C02D-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 leading provider of microcontrollers, analog, FPGA, and memory solutions, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.

The AT24C02D-SSHM-B belongs to Microchip's AT24Cxx family of I²C serial EEPROMs, designed specifically for reliable, low-power nonvolatile storage in resource-constrained embedded systems across industrial, medical, and automotive markets.

FAQ

What is the maximum I²C clock frequency supported by the AT24C02D-SSHM-B?

The AT24C02D-SSHM-B supports up to 1 MHz in Fast Mode Plus, but only when VCC is ≥2.5V. At 1.7–2.4V, maximum clock frequency is limited to 400 kHz (Fast Mode). This voltage-dependent timing ensures signal integrity across its full 1.7–3.6V operating range. Always verify VCC level before configuring I²C peripheral clock dividers for AT24C02D-SSHM-B communication.

Does the AT24C02D-SSHM-B require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C02D-SSHM-B requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is a CMOS input. Microchip specifies maximum pull-up values of 10 kΩ for standard mode and lower values (e.g., 1.3 kΩ for 1 MHz) to meet rise-time requirements. Failure to install appropriate pull-ups will result in bus communication failure or intermittent ACK/NACK errors during AT24C02D-SSHM-B read/write operations.

How does the Write-Protect (WP) pin function on the AT24C02D-SSHM-B?

When the WP pin of the AT24C02D-SSHM-B is driven high (to VCC), all write operations-including byte, page, and erase-are inhibited. When WP is at GND or left floating (internally pulled down), normal writes are enabled. Microchip recommends hardwiring WP to a known state to prevent capacitive coupling-induced false writes. This hardware-level protection is active independently of I²C commands and applies across the entire 2-Kbit memory array.

What is the memory organization of the AT24C02D-SSHM-B?

The AT24C02D-SSHM-B is organized as 256 words × 8 bits (2 Kbit), arranged in 32 pages of 8 bytes each. This structure enables efficient 8-byte page writes and supports both random and sequential read modes. Addressing uses a 7-bit I²C slave address (1010b + A2A1A0) followed by a 1-byte memory address (0x00–0xFF). The page boundary alignment simplifies firmware buffer management during bulk writes to the AT24C02D-SSHM-B.

Is the AT24C02D-SSHM-B RoHS compliant and lead-free?

Yes, the AT24C02D-SSHM-B is RoHS compliant, lead-free, and halide-free per Microchip's green packaging initiative. The "-B" suffix in the part number explicitly denotes compliance with JEDEC JS709B and IPC-1752A standards. This makes the AT24C02D-SSHM-B suitable for export-controlled and environmentally regulated applications, including EU WEEE and China RoHS directives, without requiring special exemptions or material declarations beyond standard documentation.