My Inquiry
My Account
Winbond Electronics Corporation W25X40CLSSIG
- Part No.:
- W25X40CLSSIG
- Manufacturer:
- Winbond Electronics Corporation
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
W25X40CLSSIG.pdf
- Description:
- IC FLASH 4MBIT SPI 104MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,820
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
W25X40CLSSIG from Winbond is a 4 M-bit (512 KB) serial flash memory IC supporting standard SPI, dual-output SPI, and dual I/O SPI interfaces. It features uniform 4 KB sectors, 32 KB blocks, and 64 KB blocks; operates from 2.3 V to 3.6 V; delivers up to 208 Mbps data transfer via Fast Read Dual I/O (BBh); and supports true execute-in-place (XIP) operation with Continuous Read Mode. It is used in embedded boot code storage, firmware update storage, and parameter retention in space-constrained industrial controllers.
For engineers reviewing the W25X40CLSSIG datasheet, W25X40CLSSIG pinout, W25X40CLSSIG application, or W25X40CLSSIG equivalent, key selection considerations include its 8-pin SOIC 150-mil package (SN), 104 MHz max SPI clock, hardware /WP and /HOLD control, JEDEC-compliant ID support (9Fh), and 100,000+ erase/write cycles - all critical for reliable firmware storage in resource-limited microcontroller systems.
Technical Context
The W25X40CLSSIG implements a SPI-compatible command interface with support for Modes 0 and 3, enabling interoperability with most MCU SPI peripherals. Its internal architecture includes a 256-byte page buffer, status register with non-volatile BP2–BP0 and TB bits, and hardware write protection via /WP and /HOLD pins.
Dual I/O mode uses bidirectional IO0 and IO1 pins for simultaneous read/write on rising/falling CLK edges, achieving 208 Mbps effective throughput. The device supports full chip, block (32/64 KB), sector (4 KB), and page-level erases, with automatic WEL clearing after each program/erase cycle to enforce safe write sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 M-bit (512 KB), organized as 2048 × 256-byte pages |
| Supply Voltage | 2.3 V to 3.6 V - compatible with 2.5 V, 3.0 V, and 3.3 V logic domains |
| Max SPI Clock | 104 MHz - enables 208 Mbps dual-I/O read rates for fast boot code shadowing |
| Erase Granularity | Uniform 4 KB sectors, 32 KB blocks, 64 KB blocks - allows fine-grained firmware partitioning |
| Endurance & Retention | 100,000 program/erase cycles; >20 years data retention at +85°C |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded applications |
| Power Consumption | 1 mA active current; <1 µA power-down current - suitable for low-power IoT nodes |
Pinout & Package
W25X40CLSSIG is packaged in an 8-pin SOIC 150-mil (package code SN), with gull-wing leads, 1.27 mm pitch, and RoHS-compliant matte tin finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 /CS | Chip Select Input | Active-low enable; must transition high→low before instruction acceptance; tracks VCC at power-up |
| 2 DO (IO1) | Serial Data Output / Dual I/O | Unidirectional output in standard SPI; bidirectional I/O in dual modes (3Bh/BBh) |
| 3 /WP | Write Protect Input | Hardware lock for status register writes when SRP=1; active-low, enables sector-level hardware protection |
| 4 GND | Ground Reference | Primary return path for VCC and I/O signals; requires low-impedance PCB connection |
| 5 DI (IO0) | Serial Data Input / Dual I/O | Unidirectional input in standard SPI; bidirectional I/O in dual modes (3Bh/BBh) |
| 6 CLK | Serial Clock Input | Edge-triggered timing reference; supports SPI Modes 0 and 3; max 104 MHz frequency |
| 7 /HOLD | Hold Input | Pauses ongoing SPI transaction while /CS remains low; enables multi-device bus sharing |
| 8 VCC | Power Supply | 2.3–3.6 V supply; decoupling capacitor required within 10 mm of pin per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Continuous Read Mode | As few as 16 clocks overhead to address memory - enables efficient XIP execution without external RAM buffering |
| Dual I/O SPI Interface | Uses IO0/IO1 bidirectionally for 2× throughput vs. standard SPI - reduces boot time in MCU-based systems |
| Flexible Hardware Protection | /WP pin + non-volatile TB/BP bits allow top/bottom 4 KB–512 KB regions to be locked independently |
| JEDEC Standard IDs | Manufacturer ID EFh, Device ID 12h, JEDEC ID 9Fh, and 64-bit Unique Serial Number - simplify automated BOM verification |
| Low-Power Power-Down | <1 µA standby current with B9h instruction - extends battery life in always-on edge devices |
Applications
| Industrial PLC Firmware Storage | Medical Device Parameter Retention |
|---|---|
|
Use Scenario: Storing bootloader, application firmware, and calibration tables in programmable logic controllers with limited PCB area and no parallel bus. IC Role / Device Role / Timing Role: Non-volatile code and configuration storage; accessed via SPI during cold boot and runtime updates. Use Value: 4 KB sector granularity enables independent firmware module updates without erasing full image; 100K-cycle endurance supports field firmware upgrades over 10+ years. |
Use Scenario: Retaining patient-specific calibration data, usage logs, and safety-critical configuration in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, low-power parameter memory; accessed infrequently but with guaranteed integrity across power cycles. Use Value: Hardware /WP + SRP-enabled status register locking prevents accidental overwrite during ESD events; >20-year data retention meets medical device regulatory requirements. |
| IoT Edge Node Boot Image | Automotive Infotainment Configuration |
|
Use Scenario: Hosting compressed boot image for ARM Cortex-M microcontrollers in battery-powered sensor gateways. IC Role / Device Role / Timing Role: Primary boot source; loaded via Fast Read Dual I/O (BBh) into SRAM before execution. Use Value: 208 Mbps dual-I/O read rate cuts boot latency by ~2× vs. standard SPI; <1 µA power-down current minimizes quiescent drain. |
Use Scenario: Storing UI language packs, audio equalizer presets, and vehicle-specific CAN mapping in head units. IC Role / Device Role / Timing Role: Field-upgradable configuration store; accessed over automotive-grade SPI bus with /HOLD arbitration. Use Value: /HOLD pin enables seamless SPI bus sharing with other ECUs; −40°C to +85°C rating ensures operation across cabin temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF041A-SSH-T | 4 M-bit, 3.3 V only (2.7–3.6 V), max 85 MHz SPI clock, no dual-I/O mode, supports SFDP | Lacks dual-I/O throughput; better suited for cost-sensitive, non-XIP designs where boot speed is secondary | Select if SFDP compliance and lower unit cost outweigh need for 208 Mbps read performance |
| MX25L4005AM1I-12G | 4 M-bit, 2.7–3.6 V, 85 MHz max clock, supports dual/quad I/O, but requires QPI mode activation | Requires additional initialization sequence for dual mode; quad mode not supported by W25X40CLSSIG firmware | Choose only if existing design already uses Macronix quad-SPI drivers and layout accommodates same pinout |
Compared with AT25DF041A-SSH-T and MX25L4005AM1I-12G, the W25X40CLSSIG delivers superior dual-I/O throughput at 104 MHz without mode-switching overhead, maintains broader voltage tolerance (2.3–3.6 V), and offers simpler status register protection via dedicated /WP and /HOLD pins - making it optimal for deterministic boot-time performance in industrial and medical edge devices.
Availability
W25X40CLSSIG is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device parameter retention, and IoT edge node boot image hosting requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for W25X40CLSSIG 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, serial flash, and mobile DRAM solutions for embedded, communications, and consumer markets.
The W25X series was designed specifically for code storage and XIP-capable firmware execution in microcontroller-based systems where board space, pin count, and power efficiency are constrained.
FAQ
What is the maximum SPI clock frequency supported by the W25X40CLSSIG?
The W25X40CLSSIG supports a maximum SPI clock frequency of 104 MHz in standard and dual-I/O modes. This enables a 208 Mbps effective data rate using the Fast Read Dual I/O (BBh) instruction. Timing compliance requires adherence to AC electrical characteristics in the datasheet, including tV and tVH min/max values for CLK setup/hold relative to DI/DO transitions. The W25X40CLSSIG does not support quad-SPI or higher-frequency overclocking beyond 104 MHz.
Does the W25X40CLSSIG support execute-in-place (XIP) operation?
Yes, the W25X40CLSSIG supports true XIP operation via its Continuous Read Mode, which reduces instruction overhead to as few as 16 clock cycles for addressing - enabling direct CPU instruction fetch over SPI without intermediate RAM buffering. This capability is confirmed in Section 1 (General Description) and Section 7.1.2 (Dual SPI Instructions) of the official datasheet. The W25X40CLSSIG achieves this with deterministic latency and no internal prefetch buffers that could compromise real-time determinism.
How many program/erase cycles is the W25X40CLSSIG rated for?
The W25X40CLSSIG is rated for more than 100,000 program/erase cycles per sector, as specified in Section 2 (Features) and Section 9.4 (DC Electrical Characteristics) of the datasheet. This endurance applies uniformly across all 4 KB sectors, 32 KB blocks, and 64 KB blocks. Endurance testing follows JEDEC JESD22-A117 standards, and the specification remains valid across the full −40°C to +85°C operating temperature range.
What package type does the W25X40CLSSIG use?
The W25X40CLSSIG uses an 8-pin SOIC 150-mil package (package code SN), with 1.27 mm lead pitch, gull-wing leads, and RoHS-compliant matte tin plating. This package is explicitly listed in Section 11.1 (Valid Part Numbers and Top Side Marking) and Figure 1a of the datasheet. It is distinct from the SS (208-mil), SV (VSOP), ZP (WSON), UX (USON), and DA (PDIP) variants - the "SSIG" suffix confirms the SN package variant.
Can the W25X40CLSSIG be used with 2.5 V microcontrollers?
Yes, the W25X40CLSSIG operates across a 2.3 V to 3.6 V supply range, fully covering 2.5 V logic levels. Its input thresholds are referenced to VCC, ensuring reliable /CS, /WP, /HOLD, and CLK recognition at 2.5 V. DC and AC timing parameters - including tV, tVH, and tSU - remain valid across the entire voltage range per Section 9.2 (Operating Ranges) and Table 9-2 in the datasheet. No level-shifting is required for 2.5 V MCU interfaces.
W25X40CLSSIG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Winbond Electronics Corporation
- Series:
- SpiFlash®
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- 800µs
- Access Time:
- -
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
W25X40CLSSIG FAQ
1.How can I place an order for W25X40CLSSIG through Aetrix?
Please submit a Request for Quotation (RFQ) for W25X40CLSSIG 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 W25X40CLSSIG reliable?
The price and inventory of W25X40CLSSIG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for W25X40CLSSIG is usually 5 days.
3.What payment methods are accepted for W25X40CLSSIG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for W25X40CLSSIG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for W25X40CLSSIG?
W25X40CLSSIG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your W25X40CLSSIG 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 W25X40CLSSIG?
For technical support, including W25X40CLSSIG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your W25X40CLSSIG requirements.
6.How does Aetrix verify that W25X40CLSSIG is sourced from the original manufacturer or authorized distributors?
All W25X40CLSSIG 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 W25X40CLSSIG meets industry standards.
7.What is the process for return or replacement of W25X40CLSSIG?
All W25X40CLSSIG units undergo pre-shipment inspection (PSI). If there is an issue with W25X40CLSSIG, 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 W25X40CLSSIG part is unused and in its original packaging.
Return procedure for W25X40CLSSIG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
W25X40CLSSIG Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
