Microchip Technology AT24C02N-10SC-2.5

Overview

AT24C02N-10SC-2.5 from Microchip Technology (formerly Atmel) is a 2 Kbit (256 × 8) serial EEPROM IC operating from 2.5V to 5.5V, featuring I²C-compatible 2-wire interface, 100 kHz clock speed at 2.5V, hardware write protection via WP pin, and 8-byte page write capability. It serves as nonvolatile configuration storage in embedded microcontroller systems requiring low-voltage operation and industrial temperature tolerance.

For engineers reviewing the AT24C02N-10SC-2.5 datasheet, AT24C02N-10SC-2.5 pinout, AT24C02N-10SC-2.5 application, or AT24C02N-10SC-2.5 equivalent, key selection criteria include supply voltage range (2.5–5.5 V), page write size (8 bytes), endurance (1 million cycles), data retention (100 years), and JEDEC SOIC-8 package compatibility with standard PCB footprints.

Technical Context

The AT24C02N-10SC-2.5 implements a fixed 256-word × 8-bit memory array organized into 32 pages of 8 bytes each, requiring an 8-bit word address for random access. Its I²C interface uses open-drain SDA and Schmitt-triggered SCL with noise filtering, supporting standard-mode timing (tLOW ≥ 4.7 µs, tHIGH ≥ 4.0 µs at 2.5V).

Device addressing uses hardwired A0–A2 pins (all active for 2K devices), enabling up to eight AT24C02N-10SC-2.5 units on one bus. Write protection is controlled solely by the WP pin state-low enables full read/write, high disables all writes across the entire 2K array.

Key Specifications

Pinout & Package

AT24C02N-10SC-2.5 is housed in an 8-lead JEDEC-standard SOIC package (8S1), 3.9 mm × 4.9 mm body, 1.27 mm lead pitch, gull-wing leads, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02N-10SC-2.5, AT24C02D-SSHM-T extends temperature range and ESD rating for harsh environments, while M24C02-RMN6TP trades hardware WP for wider voltage support and faster I²C - making each suitable for distinct reliability or integration constraints.

Availability

AT24C02N-10SC-2.5 is available at Aetrix Electronics and suitable for smart metering, industrial PLC I/O modules, medical diagnostic equipment, and automotive body control units requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for AT24C02N-10SC-2.5 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 nonvolatile memory solutions, with broad industrial and automotive qualification expertise.

The AT24C02N-10SC-2.5 belongs to Microchip's AT24Cxx family of I²C-compatible serial EEPROMs, designed specifically for reliable, low-power, pin-efficient nonvolatile storage in resource-constrained embedded systems.

FAQ

What is the maximum clock frequency supported by AT24C02N-10SC-2.5 at 2.5V?

The AT24C02N-10SC-2.5 supports a maximum I²C clock frequency of 100 kHz when operated at 2.5V. This is specified in the AC Characteristics table under "2.7-, 2.5-, 1.8-volt" conditions. At 5.0V, it supports up to 400 kHz, but the -2.5 suffix denotes optimization for the lower-voltage domain where 100 kHz is the validated maximum timing rate for guaranteed functionality.

Does AT24C02N-10SC-2.5 require external pull-up resistors on SDA and SCL lines?

Yes, AT24C02N-10SC-2.5 requires external pull-up resistors on both SDA and SCL lines because its SDA pin is open-drain and SCL is a CMOS input with Schmitt trigger. Typical values range from 2.2 kΩ to 10 kΩ depending on bus capacitance and speed requirements; Microchip recommends 4.7 kΩ for standard-mode (100 kHz) operation with moderate trace length.

How many AT24C02N-10SC-2.5 devices can share the same I²C bus?

Up to eight AT24C02N-10SC-2.5 devices can share a single I²C bus. This is enabled by the three hardware address pins (A0, A1, A2), each configurable as high or low, yielding 2³ = 8 unique 7-bit device addresses. The base address is 0x50, and the full address is formed as 0b1010AAAx, where AAA is the A2–A0 combination.

What happens to AT24C02N-10SC-2.5 when the WP pin is left floating?

Leaving the WP pin floating on AT24C02N-10SC-2.5 is undefined and violates recommended operating conditions. The WP pin has no internal pull-up or pull-down; a floating state may cause intermittent write protection failure or erratic behavior. Microchip specifies that WP must be actively driven to either VCC (to disable writes) or GND (to enable writes) - a pull-down resistor to GND is commonly used for default-enable configurations.

Is AT24C02N-10SC-2.5 compatible with 1.8V I²C systems?

No, AT24C02N-10SC-2.5 is not guaranteed for 1.8V operation. Its suffix "-2.5" specifies a minimum supply voltage of 2.5V (2.5V to 5.5V range). For 1.8V systems, Microchip offers the AT24C02N-10SC-1.8 variant, which is characterized and tested down to 1.8V and features adjusted input thresholds and timing parameters optimized for that voltage.