Renesas R1EX25016ASA00I#S0

Overview

R1EX25016ASA00I#S0 from Renesas Electronics is a 16-kbit SPI serial EEPROM (2048 × 8-bit) in an SOP-8 package, operating from 1.8 V to 5.5 V with 5 MHz max clock speed at ≥2.5 V, 3 MHz at 1.8 V, and featuring 32-byte page write, 5 ms write cycle time, and industrial −40°C to +85°C temperature range. It serves as nonvolatile configuration storage in microcontroller-based embedded systems requiring reliable, low-power data retention.

For engineers reviewing the R1EX25016ASA00I#S0 datasheet, R1EX25016ASA00I#S0 pinout, R1EX25016ASA00I#S0 application, or R1EX25016ASA00I#S0 equivalent, key selection criteria include SPI mode 0/3 compatibility, hardware/software write protection via W and SRWD/BP bits, 100-year data retention at 25°C, 1M-cycle endurance, and SOP-8 footprint compatibility with legacy board layouts.

Technical Context

This device implements a Serial Peripheral Interface (SPI) with support for Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), enabling interoperability with standard MCU SPI controllers. Its MONOS memory technology delivers high reliability without external high-voltage programming circuitry.

The internal architecture includes a status register with WIP, WEL, BP1/BP0, and SRWD bits, enabling flexible software- and hardware-based memory protection schemes. The 32-byte page write buffer reduces total programming time versus byte-write-only EEPROMs, while HOLD functionality allows pausing ongoing transfers without chip deselection.

Key Specifications

Pinout & Package

Package: 8-pin SOP (PRSP0008DF-B / FP-8DBV), lead-free, 150 mil body width, 1.27 mm pitch, tape-and-reel (2500/reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25160B-SSHL-T and M95160-DFMN6TP/K, R1EX25016ASA00I#S0 uniquely combines 1.8 V operation, HOLD pin, and MONOS-based endurance-making it optimal for battery-powered, interrupt-sensitive, or mixed-voltage embedded systems where robustness and flexibility are critical.

Availability

R1EX25016ASA00I#S0 is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across multi-year production cycles.

Supply support for R1EX25016ASA00I#S0 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 was designed specifically for high-reliability, low-voltage SPI EEPROM applications in space-constrained embedded systems demanding extended data retention and robust write protection.

FAQ

What is the maximum clock frequency supported by R1EX25016ASA00I#S0 across its full voltage range?

R1EX25016ASA00I#S0 supports up to 5 MHz when VCC is 2.5 V to 5.5 V, and up to 3 MHz when VCC is 1.8 V to 5.5 V. This dual-speed capability ensures compatibility with both legacy 5 V systems and modern ultra-low-power 1.8 V MCUs without sacrificing throughput. The device automatically adapts to the applied VCC level-no configuration is required.

How does the HOLD pin function in R1EX25016ASA00I#S0, and what timing constraints apply?

The HOLD pin in R1EX25016ASA00I#S0 pauses ongoing SPI communication without deselecting the device or resetting internal state. To activate HOLD, the signal must go low while the serial clock (C) is low; deactivation requires HOLD to go high while C remains low. During HOLD, Q enters high-impedance and D/C are ignored-enabling MCU interrupt servicing without losing transaction context.

What write protection mechanisms does R1EX25016ASA00I#S0 provide, and how do they interact?

R1EX25016ASA00I#S0 provides layered protection: software-based via BP1/BP0 bits (configurable block lock) and hardware-based via the W pin combined with the SRWD bit. When W is low and SRWD = 1, the status register becomes read-only and all protected blocks are immune to electrical transients. This dual scheme prevents accidental or malicious writes during power-up/down or ESD events.

Is R1EX25016ASA00I#S0 compatible with standard SPI Mode 0 and Mode 3 interfaces?

Yes, R1EX25016ASA00I#S0 explicitly supports SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), matching the timing requirements of most ARM, Renesas RL78, and PIC microcontrollers. Data is latched on the rising edge of C and output on the falling edge-ensuring plug-and-play integration without custom driver modifications.

What is the page size and write cycle time for R1EX25016ASA00I#S0, and how does this affect firmware design?

R1EX25016ASA00I#S0 has a fixed 32-byte page size and a guaranteed 5 ms write cycle time per page. Firmware must align multi-byte writes to page boundaries and implement timeout checks based on this fixed duration-not variable latency. This deterministic behavior simplifies error recovery and avoids race conditions during over-the-air updates or field calibration routines.