Renesas R1EX24008ATA00A#S0

Overview

R1EX24008ATA00A from Renesas Electronics is an 8-kbit (1024 × 8-bit) two-wire serial interface EEPROM with I²C-compatible bus interface, 1.8 V to 5.5 V single-supply operation, and 400 kHz maximum clock frequency. It features 16-byte page write capability, 5 ms typical write cycle time, and operates across −40°C to +85°C for use in consumer electronics configuration storage and system parameter retention.

For engineers reviewing the R1EX24008ATA00A datasheet, R1EX24008ATA00A pinout, R1EX24008ATA00A application, or R1EX24008ATA00A equivalent, key selection considerations include its TSSOP-8 package footprint, WP-enabled hardware write protection, MONOS memory technology-based endurance (1,000k cycles @25°C), and guaranteed 100-year data retention at 25°C.

Technical Context

This device implements a standard I²C protocol-compliant two-wire interface with open-drain SDA and active-high SCL, supporting standard-mode (400 kHz) timing. Addressing uses a fixed 4-bit device code "1010" plus 3-bit hardware-selectable A0–A2 pins, enabling up to eight devices on one bus when combined with external pull-ups.

Internally, it integrates MONOS nonvolatile memory cells fabricated on a CMOS process, delivering low-power operation (2 µA max standby current), automatic page write logic, and power-on reset circuitry to prevent spurious writes during VCC ramp-up/down. Write protection is controlled via the WP pin, which locks the upper 4 kbit when asserted high.

Key Specifications

Pinout & Package

Package: 8-pin plastic TSSOP (PTSP0008JC-B / JEITA TTP-8DAV), 4.4 mm × 3.0 mm body, 0.65 mm lead pitch, Ni/Pd/Au plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C08D-SSHM-T and M95080-DRE6TG, the R1EX24008ATA00A offers superior data retention (100 years vs. 40 years typical) and MONOS-based reliability at standard I²C speeds, making it optimal for long-lifecycle consumer and industrial devices where parameter integrity outweighs raw throughput.

Availability

R1EX24008ATA00A is available at Aetrix Electronics and suitable for consumer audio configuration, industrial sensor calibration, printer firmware settings, and smart meter parameter storage requiring stable component supply and long-term obsolescence management.

Supply support for R1EX24008ATA00A 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 global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT markets.

The R1EX24xxx series was designed specifically for reliable, low-voltage, I²C-based nonvolatile storage in space-constrained consumer electronics and industrial control systems requiring high endurance and long data retention.

FAQ

What is the maximum I²C clock frequency supported by the R1EX24008ATA00A?

The R1EX24008ATA00A 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 unreliable acknowledge polling or data corruption, as confirmed in AC Characteristics Table on page 5 of the REJ03C0351-0100 datasheet. The R1EX24008ATA00A does not support fast-mode (1 MHz) operation.

How does the write protect (WP) pin function on the R1EX24008ATA00A?

When the WP pin is driven high (VIH ≥ 0.7 × VCC), the R1EX24008ATA00A disables write operations to the upper 4 kbit (addresses 0x200–0x3FF), while allowing full read/write access to the lower 4 kbit. When WP is low or unconnected (internally pulled down), all 8 kbit are writable. This hardware-level protection prevents accidental overwrites of critical firmware or calibration data without requiring software intervention. The R1EX24008ATA00A implements this using internal logic that gates write enable signals based on WP state.

What package type is used for the R1EX24008ATA00A, and what are its key mechanical dimensions?

The R1EX24008ATA00A uses an 8-pin plastic TSSOP package (RENESAS code PTSP0008JC-B, JEITA code TTP-8DAV), measuring 4.4 mm × 3.0 mm with 0.65 mm lead pitch. Its height is 1.10 mm max, and typical mass is 0.034 g. The package features Ni/Pd/Au-plated leads and complies with lead-free RoHS requirements. This footprint is compatible with standard TSSOP-8 PCB footprints and reflow profiles, distinguishing it from the SOP-8 variant R1EX24008ASA00A.

Does the R1EX24008ATA00A require external pull-up resistors on SDA and SCL lines?

Yes, the R1EX24008ATA00A requires external pull-up resistors on both SDA and SCL lines because its I/O structure uses open-drain outputs. The datasheet specifies VOL ≤ 0.4 V at IOL = 3.0 mA (VCC = 2.7–5.5 V), indicating the need for appropriately sized resistors-typically 2.2 kΩ to 10 kΩ depending on bus capacitance and rise-time targets. Failure to install pull-ups will prevent proper I²C communication, as neither line can drive high without them. The R1EX24008ATA00A itself contains no internal pull-ups.

What is the endurance rating of the R1EX24008ATA00A, and how does temperature affect it?

The R1EX24008ATA00A guarantees 1,000,000 write/erase cycles at 25°C and 100,000 cycles at 85°C, as specified in the Memory Cell Characteristics table (page 4 of REJ03C0351-0100). This derating reflects accelerated oxide wear at elevated temperatures. The MONOS memory technology enables this performance without requiring erase-before-write. Endurance is measured per memory location; distributed writes across the full 1024-word array extend effective lifetime. The R1EX24008ATA00A's endurance specification is validated under worst-case VCC (5.5 V) and timing conditions.