Microchip Technology AT24C02A-10PU-2.7

Overview

AT24C02A-10PU-2.7 from Microchip Technology (formerly Atmel) is a 2 Kbit (256 × 8) two-wire serial EEPROM with hardware write protection, optimized for low-voltage industrial applications. It operates from 2.7V to 5.5V, supports 400 kHz I²C clock rate at 2.7V+, delivers 1 million write cycles endurance, and retains data for 100 years. It is used in embedded system configuration storage, sensor calibration data retention, and power-management parameter backup.

For engineers reviewing the AT24C02A-10PU-2.7 datasheet, AT24C02A-10PU-2.7 pinout, AT24C02A-10PU-2.7 application, or AT24C02A-10PU-2.7 equivalent, key selection considerations include its 2.7–5.5 V supply range, 8-byte page write capability, WP pin hardware lock, Schmitt-trigger noise immunity, and PDIP-8 package compatibility with legacy board layouts.

Technical Context

The AT24C02A-10PU-2.7 implements a standard I²C-compatible two-wire interface with open-drain SDA and edge-triggered SCL, supporting both byte and 8-byte page writes. Its internal address counter enables current-address and sequential reads without retransmitting the word address.

It features dedicated A0–A2 address pins for multi-device bus addressing (up to eight devices), a hardware Write Protect (WP) pin that locks the upper 1K-bit array when pulled high, and Schmitt-trigger inputs with 100 ns noise suppression on SDA/SCL - all validated across −40°C to +85°C.

Key Specifications

Pinout & Package

AT24C02A-10PU-2.7 is supplied in an 8-lead plastic dual in-line package (PDIP, JEDEC MS-001 BA), 0.300" wide body, with 0.100" lead pitch. Pin 1 is marked by a notch or dot at the top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C02A-10PU-2.7, AT24C02D-SSHM-T offers higher density packaging but sacrifices through-hole serviceability, while M24C02-RMN6TP provides second-source availability but requires validation of WP-driven write-lock behavior in safety-critical contexts.

Availability

AT24C02A-10PU-2.7 is available at Aetrix Electronics and suitable for smart metering, industrial PLC modules, and automotive body electronics requiring stable component supply across extended product lifecycles.

Supply support for AT24C02A-10PU-2.7 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 acquired Atmel in 2016 and maintains full product continuity, documentation, and qualification for the AT24C02A family. The company specializes in microcontrollers, analog, and memory solutions for industrial, automotive, and IoT markets.

The AT24C02A series was designed specifically for robust, low-power, I²C-based configuration storage in harsh environments - emphasizing write endurance, voltage flexibility, and hardware data protection for mission-critical embedded systems.

FAQ

What is the maximum I²C clock frequency supported by AT24C02A-10PU-2.7?

The AT24C02A-10PU-2.7 supports up to 400 kHz I²C clock frequency when operating at 2.7 V or higher. At 1.8 V (not applicable to this -2.7 variant), the maximum is 100 kHz. This 400 kHz capability enables faster parameter loading in time-sensitive applications like motor control calibration sequences. The AC characteristics table confirms tLOW and tHIGH timing compliance at this rate across the full −40°C to +85°C range.

How does the Write Protect (WP) pin function on AT24C02A-10PU-2.7?

On AT24C02A-10PU-2.7, the WP pin provides hardware-level write protection: when tied to GND, full read/write access is enabled; when pulled to VCC, the upper half (1K-bit) of the memory array is locked against writes. This selective protection allows critical calibration data to remain immutable while permitting updates to user-configurable fields. The behavior is explicitly defined in Table 2 of the datasheet and applies only to the AT24C02A variant.

Is AT24C02A-10PU-2.7 RoHS-compliant and halogen-free?

Yes, AT24C02A-10PU-2.7 is RoHS-compliant and halogen-free, as indicated by the "U" suffix in the part number per the Ordering Information table. This designation confirms compliance with EU Directive 2011/65/EU and JEDEC JS709 standards. The PDIP package uses lead-free matte tin plating and green molding compound, making it suitable for environmentally regulated industrial and medical deployments.

What package type is used for AT24C02A-10PU-2.7?

AT24C02A-10PU-2.7 uses an 8-lead plastic dual in-line package (PDIP), designated as 8P3 per the ordering matrix. It has a 0.300" body width, 0.100" lead pitch, and conforms to JEDEC MS-001 BA mechanical specifications. This through-hole package supports breadboard prototyping, manual rework, and legacy board designs where surface-mount alternatives are not feasible.

Can AT24C02A-10PU-2.7 operate down to 2.7 V while maintaining full 400 kHz I²C performance?

Yes, AT24C02A-10PU-2.7 is fully specified for 400 kHz I²C operation across its entire 2.7 V to 5.5 V supply range. The AC Characteristics table explicitly lists fSCL = 400 kHz under the "2.5, 2.7, 5.0-volt" column, and timing parameters (tLOW, tHIGH, tSU.STA, etc.) are guaranteed at 2.7 V. No derating is required - the device meets all timing specs at minimum VCC.