Winbond Electronics Corporation W25R128FVEIQ

Overview

W25R128FVEIQ from Winbond is a 128M-bit (16MB) serial NOR flash memory with Dual/Quad SPI interface and integrated Replay Protection Monotonic Counter (RPMC) security. It operates from 2.7V to 3.6V, supports up to 104MHz clock frequency, delivers 50MB/s continuous read throughput, and features uniform 4KB sectors, 64-bit unique ID, and three 256-byte OTP-locked security registers. It is used for secure code storage and XIP execution in embedded boot systems.

For engineers reviewing the W25R128FVEIQ datasheet, W25R128FVEIQ pinout, W25R128FVEIQ application, or W25R128FVEIQ equivalent, this page provides verified package mapping (8-pin WSON 6×5-mm), confirmed RPMC cryptographic operation (HMAC-SHA-256), validated Quad SPI instruction set (6Bh/EBh), and real-world design constraints including /CS tracking requirement at power-up and /RESET pin behavior on SOIC-16 variants.

Technical Context

The W25R128FVEIQ implements a SPI-compatible bus supporting Mode 0 and Mode 3 clock polarity, with dedicated hardware /RESET only on 16-pin SOIC packages - the W25R128FVEIQ (EIQ suffix) uses the 8-pin WSON 6×5-mm (Package Code P) and lacks a physical /RESET pin. Its RPMC subsystem includes four independent 32-bit monotonic counters addressed via 8-bit Counter_Address and secured by HMAC-SHA-256 key derivation using root key and HMAC key registers.

Quad SPI operation requires IO0–IO3 bidirectional pins and factory-set QE bit (non-volatile, unchangeable); standard/dual SPI uses only IO0 and IO1. Erase granularity includes 4KB sectors, 32KB blocks, and 64KB blocks, with suspend/resume capability for both erase and program operations - all managed through status register bits (SUS, WEL, BUSY) and discrete instructions (75h/7Ah).

Key Specifications

Pinout & Package

W25R128FVEIQ uses the 8-pad WSON 6×5-mm package (Package Code P), with exposed thermal pad (not electrically connected). Pin 1 is marked by a dot or beveled corner; pin numbering follows counter-clockwise orientation from top-left when viewed from top.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial NOR flash applications.

Compared with W25R128FVEIQ, W25Q128JVSIM offers higher clock speed but omits RPMC and OTP security registers, making it unsuitable for certified secure boot; S25FL128SAGMFI00 provides alternate vendor sourcing but lacks hardware anti-replay and requires board-level interface redesign for HyperBus use.

Availability

W25R128FVEIQ is available at Aetrix Electronics and suitable for secure boot loader storage, firmware OTA update partitioning, industrial HMI configuration archiving, and automotive infotainment media caching requiring stable component supply and long-term lifecycle assurance.

Supply support for W25R128FVEIQ 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

Winbond Electronics is a Taiwan-based semiconductor company specializing in specialty DRAM, mobile DRAM, and serial flash memory solutions for embedded, communications, and consumer markets.

The W25R series was designed specifically for secure embedded applications requiring hardware-enforced anti-replay protection, monotonic counter integrity, and robust SPI-based code storage - targeting automotive telematics, industrial controllers, and IoT edge nodes.

FAQ

What is the package type and footprint of W25R128FVEIQ?

W25R128FVEIQ uses the 8-pad WSON 6×5-mm package (Package Code P) with an exposed thermal pad. It has no /RESET pin - that feature is exclusive to the 16-pin SOIC variant (W25R128FVF). The pinout matches Figure 1b in the datasheet: /CS, IO1, IO2, GND, IO0, CLK, IO3, VCC in counter-clockwise order from pin 1. This package is RoHS-compliant and compatible with standard reflow profiles.

Does W25R128FVEIQ support hardware reset via /RESET pin?

No, W25R128FVEIQ does not include a hardware /RESET pin. That functionality is only present on the 16-pin SOIC package (e.g., W25R128FVF). For W25R128FVEIQ, reset must be performed via software sequence: Enable Reset (66h) followed by Reset Device (99h), which takes ~30 µs. The absence of /RESET simplifies PCB layout but requires host firmware to manage reset timing and error recovery.

How is RPMC implemented in W25R128FVEIQ and what cryptographic algorithm does it use?

W25R128FVEIQ implements RPMC using four independent 32-bit monotonic counters addressed via 8-bit Counter_Address, secured by HMAC-SHA-256. The HMAC process combines a secret root key (written to Root Key Register via 9Bh+00h) and HMAC key (updated via 9Bh+01h) with message data to generate a 256-bit authentication tag. Each counter increments only upon successful authenticated write, preventing rollback or replay of prior states.

Is the Quad SPI mode enabled by default on W25R128FVEIQ?

Yes, Quad SPI mode is factory-enabled on W25R128FVEIQ via the unchangeable Quad Enable (QE) bit in Status Register-1 (bit 6). This means IO2 and IO3 are active for Quad I/O instructions (e.g., EBh, 6Bh) without software configuration. Attempting to clear QE has no effect - ensuring guaranteed high-speed interface readiness and eliminating configuration errors in production firmware.

What are the valid operating voltage and temperature ranges for W25R128FVEIQ?

W25R128FVEIQ operates from 2.7 V to 3.6 V over an industrial temperature range of −40°C to +85°C. It draws as little as 4 mA during active read operations and less than 10 µA in deep power-down mode (B9h). These specifications are fully characterized and guaranteed across the entire range - critical for battery-powered edge sensors and fanless industrial controllers where thermal margin is constrained.