Winbond Electronics Corporation W25X16VSFIG

Overview

W25X16VSFIG from Winbond is a 16 M-bit (2 MB) serial flash memory IC supporting standard and dual-output SPI interfaces, organized into 8,192 pages of 256 bytes each with uniform 4 KB sectors and 64 KB blocks, operating from 2.7V to 3.6V, and used for code storage, firmware boot, and parameter retention in space-constrained embedded systems.

For engineers reviewing the W25X16VSFIG datasheet, W25X16VSFIG pinout, W25X16VSFIG application, or W25X16VSFIG equivalent, key selection considerations include its 75 MHz SPI clock support, Fast Read Dual Output (3Bh) instruction enabling 150 Mbps effective throughput, hardware /WP and /HOLD control, and flexible sector/block erase architecture for reliable firmware updates and data logging.

Technical Context

The W25X16VSFIG implements a standard SPI interface compliant with Modes 0 and 3, with separate DO (data output) and DIO (bidirectional data I/O) pins enabling single- or dual-output read operations. Its internal architecture supports page programming (≤256 bytes), sector erase (4 KB), block erase (64 KB), and chip erase, all managed via status register-controlled write enable/disable sequences.

Write protection combines software configuration (SRP, BP2–BP0, TB bits in status register) and hardware inputs (/WP pin active-low, /HOLD for bus arbitration), while power-down mode reduces current to 1 µA typical. The device features JEDEC-compliant manufacturer and device ID reads (90h/9Fh) and auto-increment sequential read capability.

Key Specifications

Pinout & Package

W25X16VSFIG is packaged in an 8-pin SOIC 208-mil (package code SS), with gull-wing leads, 1.27 mm pitch, and body dimensions of 5.3 mm × 5.3 mm × 1.75 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT25DF161-SSHN-B, W25X16VSFIG delivers 50% higher effective read throughput via dual-output mode and finer 4 KB sector granularity; compared with S25FL132K0XMFI010, it uses simpler 4-wire SPI instead of QSPI, reducing MCU pin count and driver complexity for basic boot and storage needs.

Availability

W25X16VSFIG is available at Aetrix Electronics and suitable for boot code storage, firmware update partitions, and configuration data retention requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for W25X16VSFIG 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 memory solutions, including NOR/NAND flash, SRAM, and mobile DRAM, serving automotive, industrial, and consumer markets since 1987.

The W25X series was designed specifically for embedded systems requiring high-reliability, low-pin-count serial flash with fast read performance and robust write protection - targeting microcontroller boot, IoT firmware, and industrial HMI applications.

FAQ

What is the maximum SPI clock frequency supported by the W25X16VSFIG?

The W25X16VSFIG supports a maximum SPI clock frequency of 75 MHz. This enables standard read operations at up to 75 Mbps and Fast Read Dual Output (instruction 3Bh) at an effective 150 Mbps, matching the bandwidth of many 8-bit parallel flash devices while using only four signal lines. The 75 MHz rating is specified across the full industrial temperature range (-40°C to +85°C) and 2.7–3.6 V supply.

Does the W25X16VSFIG support dual-output SPI mode, and how is it enabled?

Yes, the W25X16VSFIG supports dual-output SPI using the Fast Read Dual Output instruction (0x3B). When this command is issued, the DIO pin functions as a second data output alongside DO, doubling read bandwidth. No configuration register setting is required - activation is instruction-driven. The feature operates only during the 0x3B command sequence; all other instructions use standard single-output SPI.

What package type does the W25X16VSFIG use, and what are its key mechanical dimensions?

The W25X16VSFIG uses an 8-pin SOIC 208-mil package (Winbond package code SS), with gull-wing leads, 1.27 mm pitch, and body dimensions of 5.3 mm × 5.3 mm × 1.75 mm. This industry-standard footprint ensures drop-in compatibility with existing PCB layouts designed for 208-mil SOIC flash devices and simplifies rework and hand-soldering.

How does hardware write protection work on the W25X16VSFIG?

Hardware write protection on the W25X16VSFIG is implemented via the /WP (pin 3) input, which - when held low - disables writes to the status register if the Status Register Protect (SRP) bit is set to 1. This prevents modification of block protection bits (BP2–BP0) and top/bottom select (TB), safeguarding firmware or configuration data from accidental overwrite during system operation or power transients.

What is the endurance and data retention specification for the W25X16VSFIG?

The W25X16VSFIG guarantees 100,000 program/erase cycles per sector and 20 years of data retention at +85°C. These specifications are validated per JEDEC standards and apply across the full operating voltage (2.7–3.6 V) and temperature (-40°C to +85°C) ranges. Endurance is measured at the sector level, allowing wear leveling across 512 independent 4 KB sectors.