Renesas R1EX24004ATAS0I#S0

Overview

R1EX24004ATAS0I from Renesas Electronics is a 4 kbit (512 × 8-bit) two-wire serial interface EEPROM using MONOS memory technology, operating from 1.8 V to 5.5 V supply, supporting 400 kHz I²C clock frequency, and rated for −40°C to +85°C industrial temperature range. It serves as nonvolatile configuration storage in microcontroller-based systems requiring reliable parameter retention across power cycles.

For engineers reviewing the R1EX24004ATAS0I datasheet, R1EX24004ATAS0I pinout, R1EX24004ATAS0I application, or R1EX24004ATAS0I equivalent, key selection criteria include its TSSOP-8 package footprint, 16-byte page write capability, 5 ms write cycle time, 1,000k endurance at 25°C, and WP pin–enabled hardware write protection - all critical for embedded firmware update, calibration data logging, and sensor offset storage designs.

Technical Context

This device implements a true two-wire I²C-compatible serial interface with SCL/SDA pins, internal address decoding (A0–A2), and open-drain SDA output requiring external pull-up. Its control logic integrates voltage detection, high-voltage generation for programming, and serial-parallel conversion - enabling byte and page write operations without external high-voltage sources.

The memory array uses MONOS (Metal-Oxide-Nitride-Oxide-Silicon) charge-trap technology on a CMOS process, delivering 100-year data retention at 25°C and 10-year retention at 85°C. Write protection is implemented via dedicated WP pin with internal VSS pull-down, allowing full-array lock when driven high.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C04D-SSHM-T and BR24G04NUX-10, the R1EX24004ATAS0I delivers superior data retention (100 years) and higher write endurance at room temperature, making it optimal for applications where configuration data must survive decades without refresh - especially where replacement is impractical or costly.

Availability

R1EX24004ATAS0I is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded firmware configuration, smart meter security keys, and automotive body control module applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for R1EX24004ATAS0I 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 specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.

The R1EX24xxx series was designed specifically for high-reliability, low-power nonvolatile storage in space- and power-constrained embedded systems - emphasizing MONOS-based longevity, wide voltage operation, and industrial temperature resilience.

FAQ

What is the maximum I²C clock frequency supported by the R1EX24004ATAS0I?

The R1EX24004ATAS0I supports a maximum I²C clock frequency of 400 kHz, as specified in its AC characteristics table. This allows reliable communication with standard-mode I²C controllers without requiring high-speed mode hardware. The device meets timing parameters including tLOW ≥1200 ns and tHIGH ≥600 ns at this rate, ensuring robust operation across voltage and temperature ranges. R1EX24004ATAS0I does not support fast-mode (1 MHz) or higher I²C speeds.

How does the WP pin function on the R1EX24004ATAS0I?

The WP (Write Protect) pin on the R1EX24004ATAS0I is an active-high hardware lock that disables all write operations when driven high (VIH ≥0.7×VCC). When WP is low or floating (internally pulled down to VSS), full read/write access is enabled. During write protection, the device returns a NO ACK ('1') after receiving write data, preventing unintended overwrites. This feature is essential for safeguarding calibration data or security keys in deployed systems. R1EX24004ATAS0I implements this protection at the silicon level without software overhead.

What is the endurance rating of the R1EX24004ATAS0I at 85°C?

The R1EX24004ATAS0I is rated for 100,000 write/erase cycles at 85°C, as documented in its Memory Cell Characteristics table. This is distinct from its 1,000,000-cycle rating at 25°C and reflects accelerated wear at elevated temperature. The specification is verified per JEDEC standards and applies to the full 4 kbit array. Users designing for extended high-temperature operation should apply appropriate wear-leveling or write-minimization strategies. R1EX24004ATAS0I maintains this endurance while retaining 10 years of data at 85°C.

Does the R1EX24004ATAS0I require an external high-voltage supply for write operations?

No, the R1EX24004ATAS0I does not require an external high-voltage supply for write operations. It integrates an on-chip high-voltage generator powered solely by the 1.8 V to 5.5 V VCC rail. This eliminates the need for charge pumps or external programming voltages, simplifying system design and reducing bill-of-materials cost. All write functions - including byte and 16-byte page writes - operate transparently using only the standard I²C interface and single supply. R1EX24004ATAS0I achieves this through MONOS memory technology and internal voltage boosting circuitry.

What package type is used for the R1EX24004ATAS0I?

The R1EX24004ATAS0I uses an 8-pin plastic TSSOP package (JEITA code TTP-8DAV, Renesas code PTSP0008JC-B), measuring 4.4 mm × 3.0 mm with 0.65 mm lead pitch. It features Ni/Pd/Au-plated terminals and is lead-free compliant. This compact, surface-mount package offers superior thermal performance and board-area efficiency compared to SOP-8 variants like the R1EX24004ASAS0I. The TSSOP footprint is widely supported in automated assembly processes and PCB design libraries. R1EX24004ATAS0I's package is optimized for high-density industrial and automotive PCB layouts.