Winbond Electronics Corporation W25Q16FWBYIG

Overview

W25Q16FWBYIG from Winbond is a 1.8V, 16M-bit serial NOR flash memory supporting Standard/Dual/Quad SPI and QPI interfaces, organized as 8192 × 256-byte pages with 4KB uniform sector erase, 32KB/64KB block erase, and chip erase capabilities. It delivers up to 104MHz SPI clock rate (416MHz equivalent Quad I/O), 50MB/s continuous read throughput, and operates across –40°C to +85°C for embedded code storage and XIP execution in space-constrained IoT and MCU systems.

For engineers reviewing the W25Q16FWBYIG datasheet, W25Q16FWBYIG pinout, W25Q16FWBYIG application, or W25Q16FWBYIG equivalent, key selection criteria include its 1.65–1.95V supply range, quad-enable (QE) bit dependency for IO2/IO3 functionality, /HOLD vs /RESET dual-mode pin behavior on Ball Y2, JEDEC ID 0xEF4015 confirmation, and WLCSP-8 (BY) package-specific ball mapping.

Technical Context

The W25Q16FWBYIG implements a flexible SPI-compatible interface with mode-selectable operation: Standard SPI uses DI/DO unidirectionally; Dual/Quad SPI repurposes /WP and /HOLD as IO2/IO3 when QE=1; QPI mode requires explicit 0x38 entry and reduces instruction overhead to 2 clocks via 4-line parallel instruction fetch. Its architecture supports true execute-in-place (XIP) via Continuous Read Mode with wrap sizes of 8/16/32/64 bytes and ≤8-clock address setup latency.

Memory protection is implemented through volatile/non-volatile status register bits (BP2–BP0, TB, SEC, CMP, SRP0/SRP1), OTP-locked security registers (3 × 256 bytes), and hardware pins (/WP active-low, /HOLD active-low). Erase/program suspend/resume enables concurrent background operations, while SFDP (Serial Flash Discoverable Parameters) register provides standardized configuration discovery.

Key Specifications

Pinout & Package

W25Q16FWBYIG uses an 8-ball WLCSP (Wafer-Level Chip Scale Package) with 0.4 mm pitch, marked "BY" per Winbond ordering codes. This ultra-compact, bottom-terminal package is optimized for high-density PCB layouts in portable and wearables applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25Q16FWBYIG, MX25L1606EM1I-12G requires voltage translation in 1.8V systems and lacks QPI's 2-clock instruction efficiency, while S25FL116K0XMFI011 adds ECC at the cost of missing QPI and higher pin-count packages - making W25Q16FWBYIG optimal for compact, low-power XIP designs needing JEDEC-compliant configurability.

Availability

W25Q16FWBYIG is available at Aetrix Electronics and suitable for firmware storage in MCU-based edge devices, secure key provisioning in IoT nodes, audio buffering in wearables, and configuration management in industrial HMIs requiring stable component supply across multi-year production cycles.

Supply support for W25Q16FWBYIG 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 consumer, industrial, and automotive markets.

The W25Q series targets high-performance, low-voltage embedded systems requiring reliable code storage, XIP execution, and robust security - with W25Q16FWBYIG specifically engineered for space-constrained 1.8V platforms demanding QPI acceleration and WLCSP integration.

FAQ

What is the package type and footprint of W25Q16FWBYIG?

W25Q16FWBYIG uses an 8-ball WLCSP (Wafer-Level Chip Scale Package) with 0.4 mm pitch and top-side marking "BY". Its dimensions are approximately 2.0 mm × 2.2 mm × 0.5 mm, designed for high-density PCB layouts in portable electronics. The ball map follows Winbond's standard WLCSP-8 assignment: A1=/CS, A2=VCC, B1=/HOLD or /RESET (IO3), B2=DO (IO1), C1=CLK, C2=/WP (IO2), D1=DI (IO0), D2=GND.

Does W25Q16FWBYIG support Quad SPI and QPI modes, and how are they enabled?

Yes, W25Q16FWBYIG supports both Quad SPI and QPI. Quad SPI requires setting the non-volatile Quad Enable (QE) bit in Status Register-2 (SR2[1]) via Write Status Register-2 (0x31) instruction. Once QE=1, /WP and /HOLD become IO2 and IO3. QPI mode is entered using the 0x38 instruction and exited with 0xFF; it is only available when QE=1 and reduces instruction fetch to 2 clocks using all four IO lines.

What is the JEDEC ID and unique identifier of W25Q16FWBYIG?

W25Q16FWBYIG returns JEDEC ID 0xEF4015 when reading with instruction 0x9F. It also provides a factory-programmed 64-bit unique serial number accessible via instruction 0x4B, enabling device-level traceability and secure binding in firmware authentication flows. This value is guaranteed unique per unit and retained across power cycles and erase operations.

How does the /HOLD pin function differ between Standard SPI and Quad SPI modes on W25Q16FWBYIG?

In Standard and Dual SPI modes (QE=0), the B1 ball functions as active-low /HOLD to pause ongoing operations while /CS is asserted. In Quad SPI or QPI modes (QE=1), B1 becomes bidirectional IO3 and /HOLD functionality is disabled. On W25Q16FWBYIG, B1 can alternatively serve as /RESET if configured via SR2[7], but only when QE=0 - confirming that /HOLD and /RESET are mutually exclusive with Quad operation.

What erase and program endurance specifications apply to W25Q16FWBYIG?

W25Q16FWBYIG guarantees a minimum of 100,000 program/erase cycles per 4KB sector and greater than 20 years of data retention at +25°C. These values are validated per JEDEC JESD22-A117 and apply across the full operating temperature range (–40°C to +85°C). Endurance is specified per sector, not per device, allowing wear leveling algorithms to distribute writes across the 512 available sectors.