Renesas R1EX24032ASAS0A#U0

Overview

R1EX24032ASAS0A#U0 from Renesas Electronics is a 32 Kbit (4 K × 8) serial I²C-compatible EEPROM with 1.7 V to 5.5 V wide supply voltage range, 400 kHz maximum clock frequency, and endurance of 1,000,000 write cycles. It operates across –40 °C to +85 °C and supports page write (up to 32 bytes) and byte write modes for embedded sensor calibration, configuration storage, and power management state retention in industrial control modules.

For engineers reviewing the R1EX24032ASAS0A#U0 datasheet, R1EX24032ASAS0A#U0 pinout, R1EX24032ASAS0A#U0 application, or R1EX24032ASAS0A#U0 equivalent, key selection criteria include guaranteed 1.7 V operation at extended temperature, hardware write protection via WP pin, built-in write cycle timing control, and AEC-Q100 Grade 2 qualification for automotive body electronics integration.

Technical Context

This EEPROM implements standard I²C protocol (SMbus-compatible) with fixed 7-bit slave address (0x50–0x57) determined by A2/A1/A0 pins, supporting random and sequential read operations. It integrates an internal charge pump for reliable write operations across full VCC range without external high-voltage programming.

Write protection is enforced through both software lock bits and hardware WP pin assertion, preventing inadvertent overwrites during power transitions. The device features automatic erase-before-write, self-timed write cycles (max 5 ms), and data retention exceeding 100 years at +25 °C.

Key Specifications

Pinout & Package

Package: 8-pin SOP (Small Outline Package), 150 mil width, JEDEC MS-012AC compliant. Lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C32D-SSHM-T, R1EX24032ASAS0A#U0 provides mandatory automotive qualification and tighter write-cycle timing control; versus BR24G32FJ-3GE2, it offers identical qualification but distinct pinout compatibility and default I²C addressing-requiring minor firmware address adjustment.

Availability

R1EX24032ASAS0A#U0 is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive body electronics, and smart energy metering requiring stable component supply across extended temperature and voltage ranges.

Supply support for R1EX24032ASAS0A#U0 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 delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The R1EX24032ASAS0A#U0 belongs to Renesas' serial EEPROM product line designed for robust, low-power nonvolatile storage in safety-critical and long-lifecycle applications demanding guaranteed data integrity.

FAQ

What is the maximum I²C clock frequency supported by R1EX24032ASAS0A#U0?

R1EX24032ASAS0A#U0 supports up to 400 kHz I²C clock frequency in standard-mode operation. This ensures compatibility with legacy microcontrollers and avoids timing violations in electrically noisy industrial environments where higher-speed buses may suffer signal integrity issues. The device fully complies with I²C specification timing requirements including setup/hold times and clock low/high periods at this rate.

Does R1EX24032ASAS0A#U0 require external high-voltage programming circuitry?

No, R1EX24032ASAS0A#U0 does not require external high-voltage programming. It integrates an internal charge pump that generates the necessary programming voltage from the standard VCC supply (1.7–5.5 V), enabling single-supply operation and eliminating external components. All write operations-including page and byte writes-are self-timed and complete within 5 ms maximum.

How is write protection implemented on R1EX24032ASAS0A#U0?

R1EX24032ASAS0A#U0 implements dual-layer write protection: hardware-level lock via the WP pin (active HIGH) and software-level lock via internal lock bits. When WP is HIGH, all write operations are disabled regardless of software state. Lock bits can be set to protect specific memory blocks or the entire array, providing defense-in-depth against accidental or malicious overwrites during firmware updates or power faults.

Is R1EX24032ASAS0A#U0 qualified for automotive applications?

Yes, R1EX24032ASAS0A#U0 is AEC-Q100 Grade 2 qualified, meaning it is tested and certified for operation from –40 °C to +105 °C ambient temperature-meeting stringent automotive reliability and stress-test requirements. While its rated operating junction temperature is –40 °C to +85 °C, the qualification confirms robustness for under-dash and body-control module deployments.

What is the page write size for R1EX24032ASAS0A#U0?

R1EX24032ASAS0A#U0 supports a 32-byte page write buffer. This allows up to 32 consecutive bytes to be written in a single I²C transaction after the initial address byte, significantly improving throughput compared to byte-write mode. Page boundaries align to 32-byte offsets (0x000–0x01F, 0x020–0x03F, etc.), and crossing a boundary triggers automatic wraparound to the start of the same page.