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Winbond Electronics Corporation W25Q16FWSSIG
- Part No.:
- W25Q16FWSSIG
- Manufacturer:
- Winbond Electronics Corporation
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
W25Q16FWSSIG.pdf
- Description:
- IC FLASH 16MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,645
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Product details
Overview
W25Q16FWSSIG from Winbond is a 1.8V, 16M-bit serial flash memory IC supporting Standard/Dual/Quad SPI and QPI interfaces, organized as 8192 × 256-byte pages with 4KB uniform sector erase, 104MHz max clock, and 50MB/s continuous read throughput - used for XIP code execution, firmware storage, and parameter retention in space-constrained embedded systems.
For engineers reviewing the W25Q16FWSSIG datasheet, W25Q16FWSSIG pinout, W25Q16FWSSIG application, or W25Q16FWSSIG equivalent, key selection criteria include quad I/O enable (QE bit), /HOLD vs /RESET configuration flexibility, 1.65–1.95V supply compliance, JEDEC ID and SFDP register support, and hardware write protection via /WP and status register bits.
Technical Context
The W25Q16FWSSIG implements a multi-mode serial interface: Standard SPI (DI/DO) supports Mode 0/3; Dual SPI repurposes DI/DO as IO0/IO1; Quad SPI enables IO0–IO3 when QE=1 in Status Register-2, converting /WP and /HOLD to IO2/IO3. QPI mode further reduces instruction overhead to 2 clocks using all four I/O lines.
Its flexible erase architecture supports 4KB sector, 32KB block, 64KB block, and full-chip erase, with program-erase suspend/resume, 100K-cycle endurance per sector, and >20-year data retention. Security features include three 256-byte OTP-lockable security registers, 64-bit unique ID, and configurable top/bottom/complement array protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 16 M-bit (2 MB), organized as 8192 × 256-byte programmable pages |
| Supply Voltage | 1.65 V to 1.95 V - enables direct integration into 1.8V logic domains without level shifting |
| Max Clock Frequency | 104 MHz (SPI), enabling 208 MB/s dual-I/O and 416 MB/s quad-I/O effective throughput |
| Erase Granularity | Uniform 4 KB sectors (512 total), plus 32 KB and 64 KB blocks - supports fine-grained firmware update partitioning |
| Write Protection | Hardware /WP pin + software-configurable BP[2:0], TB, SEC, CMP, SRP[1:0] bits - enables selective sector lockdown |
| Interface Modes | Standard SPI, Dual SPI, Quad SPI, and QPI - selectable via instruction set and QE bit; QPI reduces instruction latency to 2 clocks |
| Data Retention | Greater than 20 years at +25°C - suitable for long-lifecycle industrial and automotive firmware storage |
Pinout & Package
W25Q16FWSSIG is supplied in an 8-pin SOIC 208-mil package (package code SS), with lead-free, RoHS-compliant finish and standard surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 /CS | Chip Select Input | Active-low enable; high-impedance DO and standby current when deasserted |
| 2 DO (IO1) | Data Output / Bidirectional I/O1 | Unidirectional output in Standard SPI; bidirectional in Dual/Quad SPI and QPI |
| 3 /WP (IO2) | Write Protect Input / Bidirectional I/O2 | Hardware lock for status register when QE=0; becomes IO2 in Quad SPI/QPI when QE=1 |
| 4 GND | Ground Reference | Primary return path for VCC and I/O signals; requires low-impedance PCB plane |
| 5 DI (IO0) | Data Input / Bidirectional I/O0 | Unidirectional input in Standard SPI; bidirectional in Dual/Quad SPI and QPI |
| 6 CLK | Serial Clock Input | Synchronizes all SPI/QPI transfers; supports Mode 0 and Mode 3 clock polarity/phase |
| 7 /HOLD or /RESET (IO3) | Hold or Reset Input / Bidirectional I/O3 | Pauses ongoing operation when QE=0; becomes IO3 in Quad SPI/QPI; configurable as /RESET via status register |
| 8 VCC | Power Supply | 1.65–1.95 V core supply; decoupling capacitor required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Quad Peripheral Interface (QPI) | Reduces instruction overhead from 8 to 2 clocks, enabling faster XIP startup and lower CPU load during firmware fetch |
| Erase/Program Suspend & Resume | Allows interruption of long erase/program cycles to service time-critical interrupts, then resume without data loss |
| JEDEC ID + SFDP Register | Enables automatic flash detection and parameter discovery in bootloader/firmware, eliminating hard-coded timing constants |
| 64-bit Unique Serial Number | Provides device-level traceability for secure boot, licensing, and field failure analysis without external EEPROM |
| Three 256-byte Security Registers | OTP-lockable storage for keys, certificates, or calibration data - isolated from main array and protected by dedicated locks |
Applications
| IoT Edge Node Firmware Storage | Industrial PLC Boot Memory |
|---|---|
|
Use Scenario: Storing signed firmware images and OTA update payloads in battery-powered sensor nodes with strict power budgets. IC Role / Device Role / Timing Role: Non-volatile code and configuration storage with fast Quad SPI read for low-latency boot and secure firmware validation. Use Value: 1µA power-down current and 4KB sector erase enable efficient partial updates without full reflash, extending battery life. |
Use Scenario: Hosting real-time control firmware and configuration tables in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary boot memory accessed via XIP over Quad SPI to minimize external RAM usage and reduce BOM cost. Use Value: 100K program-erase cycles and >20-year data retention ensure reliability across 15+ year product lifecycles in harsh environments. |
| Automotive Infotainment Bootloader | Medical Diagnostic Device Parameter Storage |
|
Use Scenario: Storing bootloader code and secure boot keys in head-unit ECUs requiring AEC-Q100 compliance and functional safety support. IC Role / Device Role / Timing Role: Trusted firmware repository with hardware /WP pin and OTP security registers for root-of-trust chain initialization. Use Value: 64-bit unique ID and JEDEC SFDP enable deterministic flash initialization and cryptographic key binding per unit. |
Use Scenario: Retaining calibrated sensor offsets, user preferences, and audit logs in portable ultrasound or ECG devices. IC Role / Device Role / Timing Role: Reliable parameter archive with individual sector lock (36h/39h) to prevent accidental overwrite of critical calibration data. Use Value: Top/bottom and complement array protection (TB, CMP bits) allow independent locking of clinical vs. service-accessible regions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q16JWSSIQ | Same density and pinout, but uses newer 1.65–2.0V supply range and includes enhanced security (Secure OTP, Secure OTP Lock) | Supports higher voltage margin and stronger cryptographic key protection; not drop-in due to different OTP lock behavior | Select W25Q16JWSSIQ only if Secure OTP and extended voltage tolerance are required; verify bootloader compatibility with new security register map |
| Micron MT25QL128ABA8ESF-0SIT | 128M-bit (16MB) density, 1.7–2.0V supply, supports octal DTR mode; pin-compatible but larger capacity and different command set | Used where higher firmware storage headroom is needed; requires firmware driver update for extended address space and octal commands | Choose MT25QL128ABA8ESF-0SIT only when scaling beyond 2MB firmware; confirm QPI mode and SFDP parameter compatibility in host driver stack |
Compared with W25Q16FWSSIG, W25Q16JWSSIQ offers tighter security and wider voltage margin but requires OTP lock revalidation, while MT25QL128ABA8ESF-0SIT provides 8× capacity and octal support at the cost of driver redesign and non-drop-in replacement.
Availability
W25Q16FWSSIG is available at Aetrix Electronics and suitable for IoT edge node firmware storage, industrial PLC boot memory, and automotive infotainment bootloader applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for W25Q16FWSSIG 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 NOR/NAND flash memory solutions for embedded, communications, and consumer markets.
The W25Q16FWSSIG belongs to Winbond's W25Q family of high-performance serial flash devices, designed specifically for execute-in-place (XIP) code execution, firmware storage, and secure parameter retention in resource-constrained microcontroller systems.
FAQ
What is the operating voltage range for the W25Q16FWSSIG?
The W25Q16FWSSIG operates from 1.65 V to 1.95 V. This narrow 1.8V nominal range ensures compatibility with modern ultra-low-power microcontrollers and eliminates the need for external level shifters in 1.8V system designs. Operation outside this range may cause unreliable read/write behavior or permanent damage. The W25Q16FWSSIG datasheet specifies strict power-up sequencing requirements to maintain register integrity during voltage ramp.
Does the W25Q16FWSSIG support Quad SPI mode out of the box?
No - the W25Q16FWSSIG requires the Quad Enable (QE) bit in Status Register-2 to be set before Quad SPI mode becomes active. By default, QE=0 after power-up or reset, so /WP and /HOLD function as hardware control pins. Setting QE=1 via Write Status Register-2 (31h) reassigns those pins to IO2 and IO3. The W25Q16FWSSIG must then use Quad SPI instructions (e.g., 6Bh, EBh) and cannot mix standard and quad commands without reconfiguration.
How does the /HOLD pin behave when QE=1 on the W25Q16FWSSIG?
When QE=1, the /HOLD pin on the W25Q16FWSSIG is reassigned as IO3 and no longer functions as a hold input. Attempting to assert /HOLD in Quad SPI or QPI mode has no effect on device operation. The hold function is only available in Standard and Dual SPI modes (QE=0). This behavior is explicitly defined in the W25Q16FWSSIG pin description table and verified in Section 4.4 of the official datasheet.
Can the W25Q16FWSSIG be used for secure boot applications?
Yes - the W25Q16FWSSIG supports secure boot through multiple hardware-enforced mechanisms: a 64-bit unique serial number for device identity binding, three 256-byte security registers with OTP lock capability for storing cryptographic keys, and configurable memory protection (BP, TB, CMP bits) to isolate boot code from runtime updates. These features are documented in Sections 2 and 7 of the W25Q16FWSSIG datasheet and require proper initialization in the host bootloader.
What erase options are available on the W25Q16FWSSIG?
The W25Q16FWSSIG supports four erase granularities: 4KB sector erase (20h), 32KB block erase (52h), 64KB block erase (D8h), and full chip erase (C7h/60h). It contains 512 erasable 4KB sectors and 32 erasable 64KB blocks. Erase operations are internally timed and verified; status register BUSY bit (bit 0) must be polled to confirm completion. All erase types are supported in Standard, Dual, and Quad SPI modes per the W25Q16FWSSIG instruction set table.
W25Q16FWSSIG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Winbond Electronics Corporation
- Series:
- SpiFlash®
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH - NOR
- Memory Size:
- 16Mbit
- Memory Organization:
- 2M x 8
- Memory Interface:
- SPI - Quad I/O, QPI
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- 60µs, 3ms
- Access Time:
- -
- Voltage - Supply:
- 1.65V ~ 1.95V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
W25Q16FWSSIG FAQ
1.How can I place an order for W25Q16FWSSIG through Aetrix?
Please submit a Request for Quotation (RFQ) for W25Q16FWSSIG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for W25Q16FWSSIG reliable?
The price and inventory of W25Q16FWSSIG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for W25Q16FWSSIG is usually 5 days.
3.What payment methods are accepted for W25Q16FWSSIG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for W25Q16FWSSIG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for W25Q16FWSSIG?
W25Q16FWSSIG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your W25Q16FWSSIG order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for W25Q16FWSSIG?
For technical support, including W25Q16FWSSIG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your W25Q16FWSSIG requirements.
6.How does Aetrix verify that W25Q16FWSSIG is sourced from the original manufacturer or authorized distributors?
All W25Q16FWSSIG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that W25Q16FWSSIG meets industry standards.
7.What is the process for return or replacement of W25Q16FWSSIG?
All W25Q16FWSSIG units undergo pre-shipment inspection (PSI). If there is an issue with W25Q16FWSSIG, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The W25Q16FWSSIG part is unused and in its original packaging.
Return procedure for W25Q16FWSSIG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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