Renesas R1EX24008ATA00I#S0

Overview

R1EX24008ATA00I#S0 from Renesas Electronics is an 8-kbit (1024 × 8-bit) two-wire serial EEPROM with I²C interface, 1.8–5.5 V single-supply operation, and 400 kHz clock frequency. It features 16-byte page write capability, 5 ms write cycle time, and operates across −40°C to +85°C for use in consumer electronics firmware storage and configuration retention.

For engineers reviewing the R1EX24008ATA00I#S0 datasheet, R1EX24008ATA00I#S0 pinout, R1EX24008ATA00I#S0 application, or R1EX24008ATA00I#S0 equivalent, key selection criteria include its TSSOP-8 package, WP-enabled hardware write protection, MONOS memory technology for 1,000k endurance, and compatibility with standard I²C bus timing requirements.

Technical Context

This device implements a two-wire I²C-compatible serial interface with fixed 1010 device code and user-configurable A0–A2 address pins supporting up to two devices on one bus. Its internal architecture includes a serial-parallel converter, high-voltage generator for programming, and address/data latches synchronized to SCL edges.

Write operations support both byte and page modes (up to 16 bytes per page), with automatic internal write-cycle timing (t_WC = 5 ms max) and acknowledge polling for host synchronization. The SDA pin uses open-drain output requiring external pull-up, while WP enables selective upper-half memory protection when driven high.

Key Specifications

Pinout & Package

Package: 8-pin plastic TSSOP (PTSP0008JC-B / TTP-8DAV), 4.4 mm × 3.0 mm body, 0.65 mm lead pitch, lead-free, RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C08D-SSHM-T and M95080-DWMT3TP/K, R1EX24008ATA00I#S0 offers superior endurance and proven MONOS reliability for long-term field deployment, while maintaining strict I²C timing compliance and hardware write protection-critical for configuration-critical consumer and industrial systems.

Availability

R1EX24008ATA00I#S0 is available at Aetrix Electronics and suitable for consumer audio, industrial sensor calibration, smart home controller, and medical diagnostic equipment requiring stable component supply and long-term obsolescence management.

Supply support for R1EX24008ATA00I#S0 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

Renesas Electronics Corporation is a Japanese semiconductor manufacturer formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, power, and memory solutions.

The R1EX24xxx series was designed specifically for cost-sensitive, space-constrained consumer and industrial applications requiring robust, low-voltage serial EEPROM with enhanced reliability beyond standard floating-gate architectures.

FAQ

What is the maximum I²C clock frequency supported by the R1EX24008ATA00I#S0?

The R1EX24008ATA00I#S0 supports a maximum I²C clock frequency of 400 kHz, compliant with standard-mode I²C specifications. This timing is validated across the full operating voltage range (1.8 V to 5.5 V) and temperature range (−40°C to +85°C). Exceeding 400 kHz may result in failed acknowledge pulses or incomplete write cycles, as confirmed in AC Characteristics Table on page 5 of REJ03C0351-0100 Rev.1.00.

Does the R1EX24008ATA00I#S0 require external pull-up resistors on SDA and SCL lines?

Yes, the R1EX24008ATA00I#S0 requires external pull-up resistors on both SDA and SCL lines because the SDA pin uses an open-drain output structure and SCL is a CMOS input. Resistor values must be selected based on bus capacitance, VOL (≤0.4 V at 3.0 mA), and system rise time requirements (<300 ns), as specified in the Pin Function section (page 7) and DC Characteristics table (page 3) of the datasheet.

How does the write protect (WP) pin function on the R1EX24008ATA00I#S0?

When the WP pin is driven high (VIH ≥ 0.7 × VCC), the R1EX24008ATA00I#S0 protects the upper half (4 kbit) of memory from write operations while allowing full read access. When WP is low or unconnected (internally pulled down), all memory is writable. This hardware-level protection prevents accidental overwrites during power transitions or firmware updates, as detailed in the Pin Description (page 2) and Write Protect Area table (page 8).

What is the guaranteed endurance and data retention for the R1EX24008ATA00I#S0?

The R1EX24008ATA00I#S0 guarantees 1,000,000 write/erase cycles at 25°C and 100 years of data retention at 25°C, as specified in the Memory Cell Characteristics table (page 4) of REJ03C0351-0100 Rev.1.00. At 85°C, endurance reduces to 100,000 cycles and retention to 10 years-values verified using MONOS charge-trap technology rather than floating-gate mechanisms.

Is the R1EX24008ATA00I#S0 compatible with 1.8 V microcontrollers?

Yes, the R1EX24008ATA00I#S0 operates across 1.8 V to 5.5 V, making it fully compatible with 1.8 V microcontrollers. Its VIH threshold is defined as VCC × 0.7 (min), so at 1.8 V supply, VIH(min) = 1.26 V-well within typical 1.8 V logic high range (1.62–1.98 V). DC Operating Conditions (page 3) and AC Characteristics (page 5) confirm full functionality at 1.8 V, including 400 kHz timing and 2 µA standby current.