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Microchip Technology SST25WF040-40-5I-SAF-T
- Part No.:
- SST25WF040-40-5I-SAF-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SST25WF040-40-5I-SAF-T.pdf
- Description:
- IC FLASH 4MBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,853
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Product details
Overview
SST25WF040-40-5I-SAF-T from Microchip Technology is a 4 Mbit (512 KByte) 1.8V SPI serial flash memory IC with uniform 4 KByte sectors, 32 KByte and 64 KByte overlay blocks, and 40 MHz high-speed read capability. It operates across industrial temperature (-40°C to +85°C), supports SPI Modes 0 and 3, and features Auto Address Increment (AAI) programming for reduced total programming time in embedded firmware storage applications.
For engineers reviewing the SST25WF040-40-5I-SAF-T datasheet, SST25WF040-40-5I-SAF-T pinout, SST25WF040-40-5I-SAF-T application, or SST25WF040-40-5I-SAF-T equivalent, key selection considerations include its 1.65–1.95 V single-supply operation, 100,000-cycle endurance, hardware reset or hold pin option, software write protection via status register BP bits, and compatibility with SOIC-8 and WSON-8 packages.
Technical Context
The SST25WF040-40-5I-SAF-T implements a four-wire SPI interface (SCK, SI, SO, CE#) with dual-mode clocking support (Mode 0 and Mode 3), enabling interoperability with diverse microcontroller host interfaces. Its SuperFlash technology uses a split-gate cell and thick-oxide tunneling injector to achieve superior reliability over conventional flash.
It integrates flexible erase architecture - including uniform 4 KByte sectors and both 32 KByte and 64 KByte overlay blocks - and supports byte-program, AAI-word-program, sector/block/chip-erase, and high-speed read (0BH command with dummy cycle) with up to 40 MHz clock frequency. End-of-write detection is implemented via BUSY-bit polling or SO pin RY/BY# status output in AAI mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512 KByte) organized as uniform 4 KByte sectors; supports 32 KByte and 64 KByte overlay blocks |
| Supply Voltage | 1.65–1.95 V - enables direct integration into 1.8 V logic domains without level shifting |
| Max Clock Frequency | 40 MHz - supports high-throughput firmware reads using High-Speed Read (0BH) instruction |
| Endurance | 100,000 program/erase cycles - suitable for field-upgradable firmware with frequent updates |
| Data Retention | Greater than 100 years - ensures long-term integrity of boot code and configuration data |
| Active Read Current | 2 mA typical @ 20 MHz - low power consumption during active firmware execution |
| Standby Current | 2 µA typical - minimizes quiescent power in always-on or battery-backed systems |
Pinout & Package
Package: 8-contact WSON (5 mm × 6 mm), RoHS-compliant, moisture-sensitive level 3 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command sequence to prevent premature termination |
| SO | Serial Data Output / RY/BY# | Primary data output; configurable as ready/busy status pin during AAI programming for hardware end-of-write detection |
| WP# | Write Protect | Enables lock-down of Block-Protection-Lock (BPL) bit; controls whether BP2/BP1/BP0 bits are writable in status register |
| VSS | Ground | Reference return path for all I/O and core circuitry; requires low-impedance connection to system ground plane |
| VDD | Power Supply | 1.65–1.95 V supply input; decoupling capacitor (≥100 nF) required within 5 mm of pin |
| RST#/HOLD# | Reset or Hold Pin | Default hardware reset at power-up; programmable to suspend SPI sequences without deselecting device via EHLD instruction |
| SCK | Serial Clock | Timing reference for SPI transfers; sampled on rising edge for inputs (SI), drives outputs (SO) on falling edge |
| SI | Serial Data Input | Command, address, and data input path; MSB-first, synchronous to SCK rising edge |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell with thick-oxide tunneling injector delivers higher endurance and longer data retention vs. standard NOR flash |
| Auto Address Increment (AAI) | Reduces total programming time by eliminating repeated address transmission for sequential word writes |
| Flexible Erase Granularity | Uniform 4 KByte sectors plus 32 KByte and 64 KByte overlay blocks enable optimized firmware update partitioning |
| Dual SPI Mode Support | Compatible with both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) hosts without hardware modification |
| Hardware Reset/Hold Option | Single-pin RST#/HOLD# provides either deterministic reset recovery or non-disruptive SPI suspension during debug or power events |
Applications
| Firmware Storage in Industrial PLCs | Secure Boot Code Storage in Medical Devices |
|---|---|
Use Scenario: Storing and executing real-time control firmware in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Non-volatile storage for boot loader and application firmware; accessed via SPI during cold start and runtime updates. Use Value: 100,000-cycle endurance and >100-year data retention ensure reliable operation over 15+ year product lifecycles without degradation. |
Use Scenario: Holding certified, immutable boot code and cryptographic keys in FDA-cleared diagnostic equipment requiring traceable firmware integrity. IC Role / Device Role / Timing Role: Secure, write-protected storage for first-stage bootloader; leverages BP2/BP1/BP0 bits and WP# pin to prevent unauthorized modification. Use Value: Software block protection combined with hardware WP# lock-down prevents accidental or malicious corruption of critical startup routines. |
| Configurable Parameter Storage in Smart Sensors | Firmware Image Swap in Network Edge Routers |
Use Scenario: Persisting calibrated sensor offsets, gain settings, and user-defined thresholds in battery-powered IoT environmental sensors. IC Role / Device Role / Timing Role: Low-power non-volatile parameter store; accessed intermittently via SPI during wake-up cycles. Use Value: 2 µA standby current and 1.65–1.95 V operation extend battery life while maintaining compatibility with energy-harvesting power supplies. |
Use Scenario: Hosting dual firmware images (active + standby) in carrier-grade edge routers to enable zero-downtime field upgrades. IC Role / Device Role / Timing Role: Dual-image flash storage supporting atomic swap via sector-level erase and AAI programming. Use Value: Uniform 4 KByte sectors and fast chip-erase (125 ms typ.) allow rapid, verified image replacement without interrupting packet forwarding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25SF041-SSHD-B | 4 Mbit, 1.7–2.0 V supply, 104 MHz max clock (quad SPI), no HOLD# pin, different status register layout | Lacks hardware hold functionality; requires quad-capable host for full speed; not pin-compatible due to differing pin functions | Select when higher throughput via Quad SPI is needed and host supports QPI; avoid if HOLD# or legacy SPI-only interface is required. |
| W25Q40EWSSIG | 4 Mbit, 1.7–1.95 V, 133 MHz max clock (quad SPI), built-in SFDP, no RST#/HOLD# pin, different erase block map | Supports JEDEC SFDP for auto-configuration but omits hardware reset/hold; uses different sector/block geometry | Prefer for new designs with SFDP-aware boot ROMs and quad-capable controllers; not drop-in for SST25WF040-40-5I-SAF-T due to pinout and command set differences. |
Compared with AT25SF041-SSHD-B and W25Q40EWSSIG, the SST25WF040-40-5I-SAF-T offers unique hardware RST#/HOLD# flexibility and proven SuperFlash reliability at 40 MHz SPI, making it optimal for legacy SPI-only industrial systems requiring deterministic reset behavior and long-term firmware stability.
Availability
SST25WF040-40-5I-SAF-T is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, smart sensor nodes, and network infrastructure requiring stable component supply and EOL mitigation support.
Supply support for SST25WF040-40-5I-SAF-T 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
Microchip Technology acquired Silicon Storage Technology (SST) in 2016 and maintains the Serial Flash 25 Series as part of its broad portfolio of non-volatile memory solutions.
The SST25WF040-40-5I-SAF-T belongs to the Serial Flash 25 Series, designed specifically for cost-sensitive, low-voltage embedded applications requiring robust firmware storage with minimal board space and power budget.
FAQ
What is the memory organization of the SST25WF040-40-5I-SAF-T?
The SST25WF040-40-5I-SAF-T contains 4 Mbit (512 KByte) of flash memory organized into uniform 4 KByte sectors. It also supports 32 KByte and 64 KByte overlay erasable blocks - the latter enabled only on 2 Mbit and 4 Mbit variants like the SST25WF040-40-5I-SAF-T. Total addressable space spans 00000H–7FFFFH.
Does the SST25WF040-40-5I-SAF-T support both SPI Mode 0 and Mode 3?
Yes, the SST25WF040-40-5I-SAF-T fully supports both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1). Input data (SI) is sampled on the rising edge of SCK in both modes, and output data (SO) is driven on the falling edge - ensuring seamless interoperability with diverse microcontroller SPI peripherals.
How does the RST#/HOLD# pin function on the SST25WF040-40-5I-SAF-T?
At power-up, the RST#/HOLD# pin defaults to hardware reset (RST#) functionality. It can be reconfigured to HOLD# mode via the Enable-Hold (EHLD) instruction. In HOLD# mode, ongoing SPI sequences pause without deselecting the device - useful for debugging or power-event handling. A full power cycle restores RST# default behavior.
What write protection mechanisms does the SST25WF040-40-5I-SAF-T provide?
The SST25WF040-40-5I-SAF-T provides dual-layer write protection: hardware-based via the WP# pin (enabling BPL bit lock-down), and software-based via Block-Protection bits BP2/BP1/BP0 in the status register. These bits define protected memory regions - from none to full array - and can be configured to safeguard boot code or calibration data.
Is the SST25WF040-40-5I-SAF-T still in production or subject to EOL?
The SST25WF040-40-5I-SAF-T is an obsolete (EOL) device per Microchip's DS20005016C datasheet revision 11/14. However, Aetrix Electronics maintains active inventory and provides lifecycle availability coordination, including last-time-buy planning and qualified alternatives for continuity-critical designs.
SST25WF040-40-5I-SAF-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 40 MHz
- Write Cycle Time - Word, Page:
- 60µs
- 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
SST25WF040-40-5I-SAF-T FAQ
1.How can I place an order for SST25WF040-40-5I-SAF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25WF040-40-5I-SAF-T 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 SST25WF040-40-5I-SAF-T reliable?
The price and inventory of SST25WF040-40-5I-SAF-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25WF040-40-5I-SAF-T is usually 5 days.
3.What payment methods are accepted for SST25WF040-40-5I-SAF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25WF040-40-5I-SAF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25WF040-40-5I-SAF-T?
SST25WF040-40-5I-SAF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25WF040-40-5I-SAF-T 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 SST25WF040-40-5I-SAF-T?
For technical support, including SST25WF040-40-5I-SAF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25WF040-40-5I-SAF-T requirements.
6.How does Aetrix verify that SST25WF040-40-5I-SAF-T is sourced from the original manufacturer or authorized distributors?
All SST25WF040-40-5I-SAF-T 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 SST25WF040-40-5I-SAF-T meets industry standards.
7.What is the process for return or replacement of SST25WF040-40-5I-SAF-T?
All SST25WF040-40-5I-SAF-T units undergo pre-shipment inspection (PSI). If there is an issue with SST25WF040-40-5I-SAF-T, 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 SST25WF040-40-5I-SAF-T part is unused and in its original packaging.
Return procedure for SST25WF040-40-5I-SAF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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