Winbond Electronics Corporation W25P16VSFIG

Overview

W25P16VSFIG from Winbond is a 16M-bit (2MB) serial Flash memory IC designed for embedded code storage and data logging in space-constrained systems. It operates on a single 2.7V–3.6V supply, supports SPI Modes 0 and 3 up to 50MHz, features 256-byte page programming (3.5ms typical), 64KB sector erase (0.6s), and includes hardware/software write protection via /WP pin and status register bits BP2–BP0/SRP.

For engineers reviewing the W25P16VSFIG datasheet, W25P16VSFIG pinout, W25P16VSFIG application, or W25P16VSFIG equivalent, key selection criteria include SOIC-8 208-mil package compatibility, parameter page support for configuration data, 100,000 program/erase cycles, 20-year data retention, and SPI bus sharing capability via /HOLD functionality.

Technical Context

The W25P16VSFIG implements a standard 4-wire SPI interface (CLK, /CS, DI, DO) with optional /HOLD and /WP control lines, enabling seamless integration with microcontrollers lacking parallel memory buses. Its internal architecture organizes memory into 8,192 × 256-byte programmable pages grouped into 32 erasable sectors of 64KB each.

Write operations require explicit Write Enable (06h) instruction before Page Program (02h), Sector Erase (D8h), or Write Status Register (01h); the BUSY bit (S0) and Write Enable Latch (WEL, S1) in the 8-bit status register provide real-time execution feedback and access control. The dedicated 256-byte Parameter Page resides outside the main array and supports sub-200ms erase.

Key Specifications

Pinout & Package

W25P16VSFIG is supplied in an 8-pin SOIC package (208-mil width, Winbond code SS), pin-compatible with legacy NexFlash NX25P16 devices. This compact surface-mount package supports automated PCB assembly and fits tight board layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25Q16JVSSIQ and AT25DF161-SSH-T, the W25P16VSFIG offers proven /HOLD support for interrupt-driven SPI sharing and a dedicated parameter page for configuration-features absent in the alternatives-making it uniquely suited for legacy industrial designs requiring deterministic bus arbitration and isolated config storage.

Availability

W25P16VSFIG is available at Aetrix Electronics and suitable for firmware boot storage, industrial sensor data logging, and consumer audio voice storage requiring stable component supply across long-lifecycle programs.

Supply support for W25P16VSFIG 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 Serial Flash, PSRAM, and mobile DRAM for embedded and communications markets.

The W25P series was designed as a drop-in replacement for NexFlash NX25P devices, targeting cost-sensitive, space-constrained applications needing reliable SPI-based non-volatile storage with hardware write protection and parameter page flexibility.

FAQ

What is the package type and pin count for W25P16VSFIG?

W25P16VSFIG uses an 8-pin SOIC package with 208-mil width (Winbond package code SS). Pin assignments include /CS, DO, /WP, GND, DI, CLK, /HOLD, and VCC - fully documented in the December 2005 datasheet revision J. This package is identical to that used for W25P80 and differs from the 16-pin SOIC used for W25P32 variants.

Does W25P16VSFIG support Quad SPI or only standard SPI?

W25P16VSFIG supports only standard 4-wire SPI (CLK, /CS, DI, DO) with optional /HOLD and /WP control lines. It does not implement Quad SPI (QSPI) or Dual SPI modes. The datasheet explicitly confirms compatibility with SPI Modes 0 and 3 only, and no quad-capable instructions (e.g., 06Bh, 6BH) appear in its instruction set.

How is write protection implemented on W25P16VSFIG?

W25P16VSFIG implements dual-layer write protection: hardware-based via the /WP pin (active-low, controlling status register writes when SRP=1) and software-based via Block Protect (BP2–BP0) and Status Register Protect (SRP) bits in the status register. These bits allow selective locking of memory sectors - e.g., BP2–BP0 = 101 protects the upper 8MB - and persist through power cycles.

What is the purpose and location of the Parameter Page in W25P16VSFIG?

The Parameter Page in W25P16VSFIG is a dedicated 256-byte memory region physically separate from the main array, accessible via Read Parameter Page (53h) and Program Parameter Page (52h) instructions. It is intended for storing infrequently changed data such as device ID, calibration values, or configuration flags - enabling fast, independent erase (<200ms) without affecting firmware or logged data.

Can W25P16VSFIG be used interchangeably with W25P16VSIQ?

W25P16VSFIG and W25P16VSIQ share identical electrical specifications, pinout, instruction set, and timing - differing only in temperature grade (I: -40°C to +85°C for VSFIG; unspecified industrial grade for VSIQ) and packaging detail (G = lead-free, RoHS-compliant plating). They are functionally and mechanically interchangeable in standard industrial applications.