Renesas R1EX25032ASA00A#S0

Overview

R1EX25032ASA00A from Renesas Electronics is a 32-kbit serial SPI EEPROM (4096 × 8-bit) operating from 1.8 V to 5.5 V, supporting up to 5 MHz clock frequency at 2.5–5.5 V, with 32-byte page write capability and 1,000k endurance cycles at 25°C. It serves as nonvolatile configuration storage in embedded control modules requiring reliable, low-power data retention.

For engineers reviewing the R1EX25032ASA00A datasheet, R1EX25032ASA00A pinout, R1EX25032ASA00A application, or R1EX25032ASA00A equivalent, key selection considerations include its SOP-8 package, SPI Mode 0/3 compatibility, hardware write protection via W and HOLD pins, and guaranteed 100-year data retention at 25°C.

Technical Context

This SPI EEPROM implements MONOS memory technology for high reliability and low-voltage operation, with integrated high-voltage generator and serial-parallel converter enabling byte/page read/write over standard SPI bus. Its status register includes WIP, WEL, BP1/BP0, and SRWD bits for precise software/hardware write protection control.

The device supports dual SPI modes (0 and 3), features automatic page write (32-byte boundary), and uses dedicated HOLD and WRITE PROTECT pins to suspend communication or freeze protected memory regions without deselecting the chip - critical for real-time systems managing concurrent firmware and parameter updates.

Key Specifications

Pinout & Package

Package: 150-mil 8-pin plastic SOP (PRSP0008DF-B), lead-free, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25320B-MAU-Y and M95320-DFMN6TP, the R1EX25032ASA00A uniquely combines HOLD functionality, hardware-assisted block protection (W + SRWD), and MONOS-based reliability at 1.8 V - making it preferred for safety-critical or low-voltage embedded systems where deterministic SPI suspension and robust write locking are mandatory.

Availability

R1EX25032ASA00A is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for R1EX25032ASA00A 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 R1EX25xxx Series was designed specifically for cost-sensitive, space-constrained embedded systems needing robust, low-voltage serial EEPROM with advanced write protection and long data retention - targeting consumer electronics, industrial controls, and automotive body electronics.

FAQ

What is the maximum clock frequency supported by R1EX25032ASA00A at 1.8 V?

The R1EX25032ASA00A supports a maximum clock frequency of 3 MHz when operated at 1.8 V to 5.5 V, as specified in the AC Characteristics table under the 1.8 V condition. This is lower than its 5 MHz rating at 2.5–5.5 V to ensure timing margin and signal integrity at minimum supply voltage. The device automatically complies with this limit when VCC is 1.8 V.

Does R1EX25032ASA00A support SPI Mode 1 or Mode 2?

No, R1EX25032ASA00A explicitly supports only SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), as stated in the Features section. It does not support Mode 1 or Mode 2. Attempting to use unsupported modes will result in incorrect data sampling or communication failure due to mismatched clock polarity and phase timing.

How does the HOLD pin function during an active write cycle in R1EX25032ASA00A?

The HOLD pin in R1EX25032ASA00A cannot suspend an active internal write cycle (tW = 5 ms). It only pauses serial communication during read or instruction phases. If HOLD is asserted during a write, the device continues the self-timed write operation uninterrupted; Q goes high-impedance, but the WIP bit remains set until completion. Communication resumes only after the write finishes and S is reasserted.

Can R1EX25032ASA00A be used in automotive powertrain applications?

No - Renesas explicitly restricts the R1EX25032ASA00A to consumer applications such as cellular phones and audio equipment, and requires sales office consultation before use in automotive systems including powertrain. Its "Standard" quality grade (per Renesas document note #7) excludes safety-critical automotive functions; AEC-Q100 qualification is not claimed for this part.

What happens to the Write Enable Latch (WEL) bit after a WRITE instruction completes in R1EX25032ASA00A?

Upon successful completion of a WRITE instruction, the Write Enable Latch (WEL) bit in R1EX25032ASA00A is automatically reset to 0. This prevents unintended subsequent writes unless a new WREN instruction is issued first. The WEL bit is also reset by WRDI execution, power-up, or WRSR completion - ensuring strict write gating for data integrity.