Renesas R1EX25004ASA00I#S0

Overview

R1EX25004ASA00I from Renesas Electronics is a 4-kbit Serial Peripheral Interface (SPI) EEPROM organized as 512 words × 8 bits, featuring MONOS memory technology, 1.8–5.5 V single-supply operation, and 16-byte page programming for accelerated write cycles. It operates across −40°C to +85°C in an SOP-8 package and is used for nonvolatile parameter storage in industrial control modules, sensor calibration registers, and firmware configuration tables.

For engineers reviewing the R1EX25004ASA00I datasheet, R1EX25004ASA00I pinout, R1EX25004ASA00I application, or R1EX25004ASA00I equivalent, key selection criteria include SPI mode 0/3 compatibility, 3 MHz max clock at 1.8 V, 5 ms write cycle time, 1,000k endurance at 25°C, and hardware write protection via W and HOLD pins.

Technical Context

This SPI EEPROM implements a serial interface compliant with SPI modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1), supporting clock frequencies up to 5 MHz at VCC ≥ 2.5 V and 3 MHz down to 1.8 V. It uses a status register with WIP, WEL, and BP1/BP0 bits to manage write enable state and software block protection of memory regions.

The device integrates a high-voltage generator for internal programming, a Y-select/sense amplifier, serial-parallel converter, and address generator. Its MONOS memory cell enables 100-year data retention at 25°C and 10-year retention at 85°C, with automatic page write (32-byte pages) and hardware write protect (W pin) and hold (HOLD pin) functions for robust system-level control.

Key Specifications

Pinout & Package

Package: 150-mil 8-pin plastic SOP (PRSP0008DF-B / FP-8DBV), lead-free, halogen-free, 2.5 mm body height, 3.9 mm × 4.89 mm footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25040B-MAU-T and M95040-DRMN3TP/K, the R1EX25004ASA00I uniquely combines MONOS-based 100-year data retention, integrated HOLD functionality for glitch-free SPI pausing, and halogen-free/lead-free compliance in a standard SOP-8 - making it optimal for long-lifecycle industrial and medical applications demanding guaranteed data integrity.

Availability

R1EX25004ASA00I is available at Aetrix Electronics and suitable for industrial PLC configuration storage, automotive sensor calibration memory, and medical device usage log applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for R1EX25004ASA00I 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 is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and infrastructure markets.

The R1EX25xxx series targets cost-sensitive, reliability-critical embedded systems requiring robust nonvolatile storage with extended data retention, low-voltage operation, and SPI bus compatibility - especially where legacy parallel EEPROMs are being replaced.

FAQ

What is the maximum SPI clock frequency supported by the R1EX25004ASA00I at 1.8 V?

The R1EX25004ASA00I supports a maximum SPI clock frequency of 3 MHz when operated at 1.8 V, as specified in the AC Characteristics table for VCC = 1.8 V to 5.5 V. This ensures reliable communication with low-voltage microcontrollers while maintaining signal integrity and timing margins under worst-case voltage and temperature conditions. The R1EX25004ASA00I maintains full functionality across its entire 1.8–5.5 V range without performance degradation.

Does the R1EX25004ASA00I support hardware write protection independent of software configuration?

Yes, the R1EX25004ASA00I provides hardware write protection via the W (Write Protect) pin: when held low, it disables all WRITE and WRSR instructions regardless of the status of the WEL bit or BP1/BP0 block protect bits. This feature operates independently of software configuration and remains active even during power-up transients, ensuring fail-safe protection of critical configuration data. The R1EX25004ASA00I retains this behavior across its full −40°C to +85°C operating range.

How many write/erase cycles can the R1EX25004ASA00I endure at 85°C?

The R1EX25004ASA00I guarantees a minimum of 100,000 write/erase cycles at 85°C, as documented in the Memory Cell Characteristics table. This endurance rating is measured under worst-case thermal stress and reflects actual qualification testing - not extrapolated data. At 25°C, the R1EX25004ASA00I delivers 1,000,000 cycles, enabling long-term reliability in applications such as industrial data loggers and automotive ECUs where frequent parameter updates occur.

What package type and dimensions does the R1EX25004ASA00I use?

The R1EX25004ASA00I uses a 150-mil 8-pin plastic SOP package (JEITA code FP-8DBV, Renesas code PRSP0008DF-B), measuring 3.90 mm × 4.89 mm with 1.27 mm pitch and 2.5 mm maximum body height. It is lead-free and halogen-free, shipped in tape-and-reel format (2,500 units per reel). This standard footprint ensures drop-in compatibility with existing SOP-8 layouts and automated assembly processes without redesign.

Can the R1EX25004ASA00I be used in SPI Mode 1 or Mode 2 interfaces?

No, the R1EX25004ASA00I only supports SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), as explicitly stated in the Features section. It does not support Mode 1 (CPOL = 0, CPHA = 1) or Mode 2 (CPOL = 1, CPHA = 0). Attempting to use unsupported modes will result in incorrect data sampling or command interpretation. The R1EX25004ASA00I's pin-level timing diagrams and functional description confirm strict adherence to Modes 0 and 3 only.