Renesas R1EX25008ASA00I#S0

Overview

R1EX25008ASA00I from Renesas Electronics is an 8-kbit SPI-compatible serial EEPROM (1024 × 8-bit) using MONOS memory technology, operating from 1.8 V to 5.5 V with 5 MHz max clock speed at ≥2.5 V, 32-byte page write capability, and industrial temperature range (−40°C to +85°C). It serves as nonvolatile configuration storage in microcontroller-based systems requiring reliable, low-power data retention.

For engineers reviewing the R1EX25008ASA00I datasheet, R1EX25008ASA00I pinout, R1EX25008ASA00I application, or R1EX25008ASA00I equivalent, this device delivers verified SPI Mode 0/3 compatibility, 100-year data retention at 25°C, 1,000k write endurance, sub-2.0 μA standby current, and hardware/software write protection via SRWD/BP bits and W/HOLD pins - critical for embedded firmware parameter storage and calibration data logging.

Technical Context

This SPI EEPROM implements a serial interface with dedicated chip select (S), serial clock (C), data input (D), data output (Q), write protect (W), and hold (HOLD) pins, supporting both standard and fast read/write timing across voltage ranges. Its internal architecture includes a high-voltage generator, Y/X decoders, sense amplifiers, and a serial-parallel converter enabling byte- and page-level access.

The device uses MONOS (Metal-Oxide-Nitride-Oxide-Silicon) charge-trap memory cells fabricated on a CMOS process, delivering high reliability without floating-gate wear-out mechanisms. Block protection is implemented via non-volatile BP1/BP0 bits in the status register, configurable per instruction, and hardware-locked when SRWD = 1 and W = low - ensuring robust immunity against unintended writes during power transients.

Key Specifications

Pinout & Package

Package: 8-pin plastic SOP (150 mil width), JEITA code FP-8DBV, Renesas code PRSP0008DF-B, lead-free, tape-and-reel (2,500 pcs/reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25080B-SSHL-T and M95080-DRMN6TP/K, the R1EX25008ASA00I uniquely combines 1.8 V operation, HOLD pin, MONOS-based 1,000k endurance, and SOP-8 packaging - making it optimal for low-power, thermally demanding, or legacy-compatible designs where functional completeness outweighs raw speed.

Availability

R1EX25008ASA00I is available at Aetrix Electronics and suitable for industrial PLC configuration storage, medical device calibration data logging, automotive body control modules, smart energy meter firmware parameters, and embedded system boot configuration requiring stable component supply over extended product lifecycles.

Supply support for R1EX25008ASA00I 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, high-reliability embedded systems requiring SPI EEPROM with extended voltage range, robust data protection, and long-term data integrity - optimized for factory-programmed calibration and field-updatable configuration.

FAQ

What is the maximum clock frequency supported by the R1EX25008ASA00I at 1.8 V?

The R1EX25008ASA00I supports a maximum clock frequency of 3 MHz when operated at 1.8 V to 5.5 V. This is specified in the AC Characteristics table on page 6 of the preliminary datasheet (R10DS0220EJ0200 Rev.2.00), with timing parameters including tCH/tCL ≥ 150 ns minimum to ensure reliable sampling under low-voltage conditions. The R1EX25008ASA00I maintains full SPI Mode 0/3 compatibility at this rate.

Does the R1EX25008ASA00I support hardware write protection independent of software configuration?

Yes, the R1EX25008ASA00I supports hardware write protection via the combination of the SRWD bit and the W pin. When SRWD = 1 and W is driven low, the device enters Hardware Protected Mode (HPM), locking the BP1/BP0 and SRWD bits in the status register. In this mode, the R1EX25008ASA00I rejects all WRSR instructions regardless of WEL state - providing immunity against firmware bugs or voltage transients.

What is the page size and write time for the R1EX25008ASA00I?

The R1EX25008ASA00I has a fixed page size of 32 bytes and a maximum write cycle time of 5 ms per page, as confirmed in the Features section (page 1) and AC Characteristics (page 5). This applies to both single-byte and multi-byte writes within the same page boundary. Page writes reduce effective programming time versus byte-by-byte operations, and the 5 ms value is guaranteed across the full −40°C to +85°C temperature range.

Is the R1EX25008ASA00I pin-compatible with other 8-pin SPI EEPROMs in SOP-8 packages?

The R1EX25008ASA00I uses standard SPI pin assignments (S, C, D, Q, W, HOLD, VCC, VSS) in an 8-pin SOP package (PRSP0008DF-B / FP-8DBV), matching industry conventions. However, pin compatibility with other vendors' parts is not guaranteed due to differences in HOLD/W behavior, status register format, and timing margins. Always verify functional equivalence and timing compliance before substitution - the R1EX25008ASA00I's HOLD pin and MONOS endurance are distinct design features.

What is the default state of the status register and memory contents at shipment for the R1EX25008ASA00I?

Per page 18 of the datasheet, all memory bits of the R1EX25008ASA00I are shipped as logical "1" (0xFF hex), and the status register bits SRWD, BP1, and BP0 are all initialized to "0". This means the device ships in Software Protected Mode (SPM) with no memory blocks protected, and the status register remains writable until SRWD is set and W is pulled low - enabling immediate configuration upon first power-up.