Microchip Technology AT24C02C-STUM-T

Overview

AT24C02C-STUM-T 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 Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) I²C protocols, and used for nonvolatile parameter storage in embedded control systems, sensor calibration modules, and power management units.

For engineers reviewing the AT24C02C-STUM-T datasheet, AT24C02C-STUM-T pinout, AT24C02C-STUM-T application, or AT24C02C-STUM-T equivalent, key selection criteria include write-protection capability via dedicated WP pin, 8-byte page write mode with ≤5 ms self-timed write cycle, ultra-low standby current (≤6 μA at 5.5V), and compatibility with multi-device I²C bus configurations using A0/A1/A2 address inputs.

Technical Context

The AT24C02C-STUM-T implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA and SCL inputs, supporting bidirectional data transfer with ACK/NACK handshaking and strict timing compliance across all supported modes. It features hardware write protection via dedicated WP pin and internal pull-downs on A0/A1/A2 pins when unconnected.

Memory is organized into 32 pages of 8 bytes each, enabling partial page writes and supporting random/sequential read operations. The device includes Power-on Reset (POR) circuitry with 100 µs tPUP delay and operates with VCC monotonic ramp rate ≤0.1 V/µs to ensure reliable initialization.

Key Specifications

Pinout & Package

AT24C02C-STUM-T is packaged in an 8-pad UDFN (2 mm × 3 mm, 0.5 mm pitch) with wettable flanks, optimized for automated optical inspection (AOI) and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02D-STUM-T, the AT24C02C-STUM-T offers proven field reliability but lacks enhanced ESD and sub-1.7V operation; versus M24C02-RMN6TP, it provides superior system-level robustness via dedicated WP pin and stricter industrial temp qualification - making it preferred for safety- or mission-critical deployments.

Availability

AT24C02C-STUM-T is available at Aetrix Electronics and suitable for industrial sensor nodes, smart metering modules, and automotive body controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for AT24C02C-STUM-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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified manufacturing and design centers worldwide.

The AT24C02C-STUM-T belongs to Microchip's legacy serial EEPROM product line, engineered for low-power, high-reliability nonvolatile storage in resource-constrained embedded systems across industrial, automotive, and medical markets.

FAQ

What is the maximum I²C clock frequency supported by the AT24C02C-STUM-T?

The AT24C02C-STUM-T supports three I²C speed modes: Standard mode up to 100 kHz (1.7V–5.5V), Fast mode up to 400 kHz (1.7V–5.5V), and Fast Mode Plus up to 1 MHz (2.5V–5.5V). The actual achievable frequency depends on VCC level and bus capacitance - for 1 MHz operation, VCC must be ≥2.5V and total SDA capacitance must be ≤100 pF per Microchip's DS20006111A specification.

Does the AT24C02C-STUM-T require external pull-up resistors on SDA and SCL lines?

Yes, the AT24C02C-STUM-T 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. Microchip specifies maximum pull-up resistance of 10 kΩ for 100 kHz, 4 kΩ for 400 kHz, and 1.3 kΩ for 1 MHz operation - values must be selected based on bus capacitance and desired rise time to meet AC timing requirements in DS20006111A.

How does the write-protect (WP) pin function on the AT24C02C-STUM-T?

The WP pin on the AT24C02C-STUM-T is an active-high hardware lock: when tied to VCC, it inhibits all write operations to the entire memory array; when grounded, normal writes are enabled. If left floating, the pin is internally pulled down to GND, enabling writes - but Microchip recommends hardwiring WP to a known state to prevent noise-induced corruption during transient conditions.

What is the memory organization of the AT24C02C-STUM-T and how does it affect page writes?

The AT24C02C-STUM-T organizes its 2-Kbit memory as 32 pages of 8 bytes each. This structure enables 8-byte page write mode, where up to 8 sequential bytes can be written in a single I²C transaction - significantly reducing bus overhead compared to byte-by-byte writes. Partial page writes are allowed, but crossing page boundaries requires separate write commands to avoid automatic wraparound to the start of the next page.

Is the AT24C02C-STUM-T compatible with the AT24C02D-STUM-T in terms of footprint and software?

Yes, the AT24C02C-STUM-T and AT24C02D-STUM-T share identical 8-pad UDFN package dimensions, pinout, and I²C command set - enabling drop-in replacement in existing designs. However, the AT24C02D-STUM-T adds enhanced ESD protection (>6 kV) and extends minimum VCC to 1.6V, so firmware relying on strict 1.7V startup behavior should verify compatibility before substitution.