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HomeProductsIntegrated Circuits (ICs)Specialized ICsW25X20BLIG
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W25X20BLIG - Winbond Electronics Corporation

Manufacturer Part Number
W25X20BLIG
Manufacturer
Winbond Electronics Corporation
Allelco Part Number
32D-W25X20BLIG
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
16,920 pcs available, New & Original
Parts Description
DAC91001
Data sheet
-
Category
Integrated Circuits (ICs) > Specialized ICs
RoHs Status
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In stock: 16920

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Specifications

W25X20BLIG Tech Specifications
Winbond Electronics Corporation - W25X20BLIG technical specifications, attributes, parameters and parts with similar specifications to Winbond Electronics Corporation - W25X20BLIG

Product Attribute Attribute Value
Part Number W25X20BLIG
Package DAC91001
Description DAC91001
Stock Condition Get 16920 pcs available quantity at Allelco
Payment PayPal / TT / Credit Card / Western Union
Allelco Certifications ESD / ISO 9001 / ISO 13485 / ISO 28000
Product Attribute Attribute Value
Manufacturer Winbond Electronics Corporation
RoHs Status -
Warranty 100% Perfect Functions
Transport port Hong Kong
Shipping by DHL / FedEx / UPS / TNT / SF Express
RFQ Email info@allelco.com

Frequently Asked Questions(FAQ)

How does the W25X20BLIG compare to other serial flash memory devices in terms of power consumption during active write operations, and what are the implications for battery-powered applications?
The W25X20BLIG operates at a typical active current of 3 mA during page program operations at 2.7V supply voltage. This is relatively moderate compared to modern ultra-low-power serial flashes that can achieve sub-1 mA active currents, but still favorable for small form-factor applications where energy efficiency is balanced with performance. In continuous programming scenarios over 10ms, this consumes approximately 30 µJ per operation—a figure that becomes significant when considering thousands of erase/write cycles in embedded firmware update systems. For battery-powered IoT nodes operating on coin cell sources, minimizing write frequency while maintaining adequate throughput often proves more impactful than raw current reduction alone.
What is the maximum clock frequency supported by the W25X20BLIG, and how does it influence system-level design decisions when interfacing with microcontrollers running at lower internal clock speeds?
The W25X20BLIG supports a maximum SPI clock frequency of 104 MHz in standard dual/quad output modes and up to 85 MHz in single I/O mode. When paired with a microcontroller such as an ARM Cortex-M0+ running at 48 MHz without hardware SPI acceleration, software-based bit-banging would limit effective data transfer rates to roughly 6–8 Mbps—well below the chip’s capability. However, even with full-duplex quad-mode transfers enabled, achieving sustained throughput above 50 Mbps requires careful PCB layout, short trace lengths, and proper pull-up/pull-down configurations on IO pins. Designers must evaluate whether the added complexity of enabling quad-I/O justifies the marginal bandwidth gain versus using a simpler single-wire interface.
Can the W25X20BLIG be used in automotive-grade temperature environments, and what derating or reliability considerations should engineers apply?
No, the W25X20BLIG is specified for commercial temperature ranges only (0°C to +70°C). It lacks AEC-Q100 qualification required for automotive applications. Operating outside this range risks parametric drift, increased leakage currents, and reduced endurance. In industrial edge devices deployed in unregulated enclosures exposed to seasonal extremes, supplemental thermal management—such as heatsinking or localized climate control—may extend functional life beyond datasheet guarantees. Endurance under elevated temperatures degrades nonlinearly; for every 10°C increase above 25°C, typical block erase cycles may drop by 30–40%, necessitating conservative wear-leveling algorithms in file storage implementations.
What is the minimum erase time for a 4KB sector in the W25X20BLIG, and how does it affect real-time system scheduling?
The typical sector erase time for a 4KB block in the W25X20BLIG is 150 ms, with a maximum of 250 ms. While not catastrophic for non-real-time tasks, this duration introduces latency that must be accounted for in time-critical firmware routines. For instance, if a bootloader attempts to reconfigure itself from flash mid-execution, the intervening delay could violate timing constraints in safety-critical monitoring loops. Engineers often implement erase-and-reprogram workflows during idle periods or use shadow RAM buffers to decouple erase operations from active execution paths.
Does the W25X20BLIG support deep power-down modes, and how does its wake-up latency compare to competing serial flash ICs?
Yes, the W25X20BLIG enters a deep power-down state consuming less than 5 µA when the CS# pin is deasserted and no activity occurs. Wake-up time from this state is typically 3 µs, allowing rapid resume after brief interruptions. Compared to some newer ultra-low-power competitors offering sub-µA sleep currents with similar wake times, the W25X20BLIG trades slightly higher quiescent current for proven compatibility with legacy SPI controllers lacking advanced low-power protocols. This makes it suitable for intermittent-logging applications where frequent context switches are expected, though continuous duty cycling benefits more from newer architectures with finer-grained sleep states.
How does the write protection feature of the W25X20BLIG function at the individual block level, and what safeguards exist against accidental overwrites?
The W25X20BLIG implements flexible write protection via status register bits that allow locking specific sectors individually. Each of the eight 4KB blocks can be independently protected using the WRSR command followed by setting WPEN or BP[2:0] bits. However, unlike some modern flashes with hardware write-protect pins tied to GPIOs, this device relies entirely on software control. A critical limitation is that bulk unlock requires sending an explicit RESET command or power cycling, leaving systems vulnerable to partial lock states if firmware crashes mid-protection sequence. Therefore, robust application code should verify protection status post-boot and maintain redundant copies of critical parameters in unprotected regions.
What happens if the W25X20BLIG receives a power glitch during a write cycle, and how can data integrity be ensured?
During a power interruption during a write or erase operation, the W25X20BLIG may leave a sector in an undefined state—potentially corrupted or partially programmed. The device offers a 1-byte configuration register to enable write protect during power loss, but this only guards against writes initiated before the glitch; it cannot recover data already being modified. To mitigate risk, designers should incorporate a brown-out detection circuit on the VCC line and ensure sufficient decoupling capacitance (typically 10 µF tantalum + 100 nF ceramic) close to the package. Additionally, implementing journaling filesystems or checksum-verified transaction logs helps detect inconsistencies during subsequent boots.
Is it possible to read the unique identifier of the W25X20BLIG, and how can this be leveraged for secure boot or device authentication?
Yes, the W25X20BLIG provides access to a factory-programmed 96-bit unique ID through the RDID command. This ID remains unalterable and can serve as a hardware fingerprint for anti-counterfeiting measures or secure boot validation. However, since the ID is stored in non-volatile memory like all other contents, it cannot be hidden from malicious actors with physical access. Thus, while useful for basic device identification, it should not replace cryptographic authentication mechanisms. Instead, pairing the ID with asymmetric signatures or encrypted firmware headers enhances security without relying solely on hardware uniqueness.
What is the recommended solder reflow profile for mounting the W25X20BLIG, and what failure modes arise from improper handling?
The W25X20BLIG is rated for lead-free reflow soldering with a peak temperature of 260°C and exposure time not exceeding 30 seconds within 220–260°C range. Exceeding these limits risks delamination of internal layers or degradation of bond wires, manifesting as increased leakage or complete functional failure. Many engineers overlook the importance of preheating ramps exceeding 2°C/s to avoid thermal shock, especially in QFN packages where the center pad exacerbates heat concentration. Post-reflow visual inspection under magnification often reveals insufficient wetting on adjacent pads, leading to intermittent connections that surface as erratic read errors rather than outright failures.
How does the W25X20BLIG handle clock stretching, and what challenges arise when interfacing with master devices that do not support it?
The W25X20BLIG does not support clock stretching; it strictly adheres to the SPI protocol by asserting or deasserting SCLK based on its own timing requirements. When connected to masters incapable of adaptive clocking—such as many legacy microcontrollers or FPGA soft-SPI cores—the mismatch can cause data misalignment if the master assumes fixed timing margins. In practice, this forces the master to poll the BUSY flag before issuing commands, effectively turning sequential operations into serialized ones. While functional, this negates much of the benefit of high-speed modes and increases total command overhead by 20–50% depending on access patterns.
What are the typical voltage levels for reliable operation of the W25X20BLIG, and how sensitive is it to supply noise?
The W25X20BLIG operates reliably across a supply range of 2.7V to 3.6V, with absolute maximum ratings extending to 4.0V. Voltage ripple above 100 mV p-p can induce transient errors during erase/program cycles due to analog charge pumps used internally. In noisy environments such as motor-driven systems, adding LC filters (e.g., 10 µH ferrite bead + 1 µF ceramic) between regulator output and VCC improves stability. Notably, the input logic thresholds scale proportionally with VCC—meaning a 3.3V system accepts ~0.9V as valid HIGH, while a 2.7V system raises this to ~0.75V—requiring careful consideration when sharing signals with mixed-voltage peripherals.
How does the endurance specification of the W25X20BLIG translate into practical lifespan expectations for typical embedded applications?
The W25X20BLIG guarantees 100,000 program/erase cycles per sector at 25°C, decreasing exponentially with temperature. Assuming uniform wear across all blocks and a worst-case scenario of 10 writes per sector daily, this yields approximately 2.7 years of continuous operation. However, most applications employ dynamic wear leveling that distributes writes evenly, extending usable life to several decades. For firmware patches or telemetry logging, actual usage rarely approaches endurance limits unless logging at kilohertz rates. Nevertheless, engineers should avoid storing frequently updated counters directly in flash; instead, buffer changes in SRAM and commit periodically to minimize cycle count.
Can multiple W25X20BLIG chips be daisy-chained on the same SPI bus, and what precautions are necessary to prevent address conflicts?
Yes, multiple W25X20BLIG devices can share an SPI bus using separate chip select lines. Since each device contains identical memory maps, the master must ensure unique addressing during read/write operations by selecting only one CS# at a time. A common pitfall is failing to deselect CS# completely between transactions, causing residual charge on floating inputs that leads to phantom writes. Additionally, when reading status registers concurrently, cross-talk between devices may corrupt data lines if rise/fall times are slow or termination resistors are omitted. Always verify signal integrity with an oscilloscope during development phases.
What is the impact of enabling quad-I/O mode on the W25X20BLIG, and how does it affect PCB routing complexity?
Enabling quad-I/O mode (via QE bit in configuration register) allows simultaneous bidirectional data transfer over four lines, doubling theoretical bandwidth compared to single-wire reads. However, it demands strict impedance matching and controlled-length traces to preserve signal integrity at frequencies approaching 100 MHz. Differential pairs are unnecessary, but skew between I/O0–I/O3 must be kept under 50 ps to avoid setup/hold violations. Routing becomes particularly challenging in compact designs where space constraints force parallel traces near noisy digital buses. Skipping quad mode simplifies layout significantly and avoids potential EMI issues, making it preferable for cost-sensitive or low-performance applications.
How does the W25X20BLIG respond to repeated power-up sequences with incomplete initialization, and what initialization best practices should be followed?
On cold starts, the W25X20BLIG defaults to single-wire mode and requires a dummy clock cycle to synchronize. If the host fails to send this, subsequent commands will fail silently. Repeated partial resets exacerbate this issue by leaving the internal state machine in ambiguous conditions. Best practice dictates always performing a soft reset (RSTEN followed by RST) after wake-up from deep power-down or brown-out recovery. Furthermore, initializing the configuration register early in the boot sequence ensures consistent behavior regardless of prior state—especially critical when migrating between development and production firmware versions.
What alternatives exist to the W25X20BLIG for applications requiring higher density or lower power consumption, and when might migration be justified?
Alternatives include Winbond’s W25Q series (e.g., W25Q40BV for 4Mb capacity) offering larger densities and improved power profiles, or newer devices like the ISSI IS25LP080D supporting down to 1.65V operation. Migration is justified when system requirements evolve toward smaller node sizes, stricter energy budgets, or enhanced security features absent in the W25X20BLIG. However, replacing existing designs incurs NRE costs, revalidation effort, and potential BOM changes. Unless compelling performance gains outweigh these factors, retaining the W25X20BLIG in mature products often reduces risk and accelerates time-to-market.

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Brazil 7
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New Zealand 5
Asia India 4
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DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
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Winbond Electronics Corporation

W25X20BLIG

Winbond Electronics Corporation
32D-W25X20BLIG

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