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Microchip Technology SST25WF040-40-5I-SAF
- Part No.:
- SST25WF040-40-5I-SAF
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SST25WF040-40-5I-SAF.pdf
- Description:
- IC FLASH 4MBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,299
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Product details
Overview
SST25WF040-40-5I-SAF from Microchip Technology is a 4 Mbit (512 KByte) 1.8V SPI serial flash memory IC used for non-volatile code and data storage in embedded systems. It operates from 1.65–1.95V, supports 40 MHz high-speed read via SPI Mode 0/3, features uniform 4 KByte sectors and 64 KByte overlay blocks, and delivers 100,000 program/erase cycles with >100-year data retention - deployed in industrial microcontroller boot loaders and firmware update storage.
For engineers reviewing the SST25WF040-40-5I-SAF datasheet, SST25WF040-40-5I-SAF pinout, SST25WF040-40-5I-SAF application, or SST25WF040-40-5I-SAF equivalent, key selection criteria include its 4 Mbit density, 1.8V single-supply operation, hardware reset/HOLD# dual-function pin, AAI programming mode, and SOIC-8/WSON-8 package compatibility in space-constrained industrial designs.
Technical Context
The SST25WF040-40-5I-SAF implements a four-wire SPI interface (SCK, SI, SO, CE#) with support for both Mode 0 and Mode 3 clock polarity/idle states. Its SuperFlash technology uses split-gate cells and thick-oxide tunneling to achieve superior endurance and low-power write operations.
It integrates configurable write protection via WP# pin and status register BP2/BP1/BP0 bits, supports end-of-write detection via BUSY bit polling or SO pin RY/BY# assertion in AAI mode, and provides dual RST#/HOLD# functionality - defaulting to hardware reset at power-up and switchable to hold mode via EHLD instruction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512 KByte) - supports full firmware images for mid-complexity MCUs without external memory expansion. |
| Supply Voltage | 1.65–1.95V - enables direct interfacing with 1.8V I/O domains of modern microcontrollers and SoCs. |
| Max Clock Frequency | 40 MHz - enables high-throughput firmware reads (e.g., XIP boot) with ~5 MB/s effective throughput using High-Speed Read (0BH). |
| Endurance | 100,000 program/erase cycles - sufficient for field firmware updates over 10+ years in industrial control applications. |
| Data Retention | >100 years - ensures long-term reliability in unpowered storage scenarios such as configuration backup or calibration data. |
| Erase Granularity | Uniform 4 KByte sectors + 32/64 KByte overlay blocks - allows flexible partitioning for bootloader, app, and parameter sectors. |
| Active Read Current | 2 mA typical @ 20 MHz - minimizes system power budget during active firmware execution or configuration loading. |
| Standby Current | 2 µA typical - supports ultra-low-power sleep modes in battery-backed or energy-harvesting systems. |
Pinout & Package
Package: 8-lead SOIC (150 mil), RoHS-compliant, industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command sequences to prevent premature termination. |
| SO | Serial Data Output / RY/BY# | Outputs read data on falling SCK edge; functions as ready/busy status pin during AAI programming when enabled via EBSY. |
| WP# | Write Protect | Enables lock-down of Block-Protection bits (BP2–BP0) in status register when driven low; disables software write protection when high. |
| VSS | Ground | Reference return path for all digital and core logic; requires low-impedance connection to minimize noise coupling into SPI signaling. |
| VDD | Power Supply | 1.65–1.95V supply input; decoupling capacitor (≥100 nF) required adjacent to pin for stable high-speed read/write operation. |
| RST#/HOLD# | Reset or Hold Control | Default hardware reset pin at power-up; configurable to suspend SPI transactions without deselecting device via EHLD instruction. |
| SCK | Serial Clock | Provides timing reference; sampled on rising edge for inputs (SI), drives outputs (SO) on falling edge; supports Mode 0 (idle low) and Mode 3 (idle high). |
| SI | Serial Data Input | Accepts opcodes, addresses, and data MSB-first on rising SCK edge; requires setup/hold timing compliance per DS20005016C. |
Key Features
| Feature | Design Value |
|---|---|
| Auto Address Increment (AAI) Programming | Reduces total programming time by eliminating repeated address transmission - critical for bulk firmware updates in production programming. |
| Flexible Erase Architecture | Supports 4 KByte sector, 32 KByte, and 64 KByte block erases - enables precise wear leveling and partial image updates without full chip erase. |
| Dual-Function RST#/HOLD# Pin | Eliminates need for separate hold logic or external reset supervisor; simplifies PCB layout while retaining suspend capability during SPI transfers. |
| Hardware Write Protection Lock-Down | Prevents accidental modification of protection bits (BP2–BP0) once BPL=1 is set - ensures bootloader integrity in deployed field units. |
| High-Speed Read (0BH) | Delivers 40 MHz read performance with dummy cycle - enables faster boot times and real-time data streaming vs. standard 20 MHz Read (03H). |
| SuperFlash Technology | Split-gate cell design achieves lower program current and shorter erase time vs. conventional flash - reduces total energy per operation by ~40%. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Backup |
|---|---|
Use Scenario: Storing firmware images and runtime parameters in programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Non-volatile boot memory and configuration store accessed via SPI during cold start and runtime reconfiguration. Use Value: 100,000-cycle endurance and >100-year retention ensure reliable operation across 15+ year product lifecycles without data corruption. |
Use Scenario: Retaining calibrated sensor offsets, user preferences, and audit logs in portable diagnostic equipment with infrequent but critical updates. IC Role / Device Role / Timing Role: Secure, low-power parameter archive with hardware write protection to prevent unauthorized modification. Use Value: WP#-enabled lock-down of status register BP bits prevents accidental overwrite of medical calibration data during service events. |
| IoT Edge Node OTA Update Storage | Automotive Body Control Module Bootloader |
Use Scenario: Holding staged firmware images for over-the-air (OTA) updates in battery-powered wireless sensors with constrained power budgets. IC Role / Device Role / Timing Role: Dual-bank storage partition supporting atomic swap between active and update images via sector-level erase control. Use Value: 2 µA standby current extends battery life to multi-year intervals; 4 KByte sector granularity enables minimal update payload sizes. |
Use Scenario: Hosting secure bootloader code that validates and loads application firmware in automotive body control modules (BCM). IC Role / Device Role / Timing Role: Trusted boot source with hardware reset integration and RST#/HOLD#-assisted safe recovery during power transients. Use Value: RST# functionality ensures deterministic recovery from brown-out conditions; SOIC-8 package meets AEC-Q200 board space constraints. |
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 Mbit, 2.3–3.6V supply, 70 MHz max clock, no HOLD# pin, JEDEC-standard SFDP support | Lacks dual RST#/HOLD# function; requires external reset management; higher voltage incompatible with 1.8V-only systems | Select only if system operates at ≥2.3V and requires SFDP-based auto-configuration; not drop-in compatible. |
| W25Q40EWUXIE | 4 Mbit, 1.65–1.95V supply, 104 MHz quad SPI, QPI mode, no RST# pin, integrated security registers | Quad I/O interface increases bandwidth but requires 4-bit bus routing; lacks hardware reset pin - relies on software reset command | Choose for higher throughput needs where PCB layout supports quad signals; verify bootloader supports QPI mode. |
Compared with AT25DF041A-SSH-T and W25Q40EWUXIE, the SST25WF040-40-5I-SAF uniquely combines 1.8V operation, hardware RST#/HOLD# flexibility, and AAI programming - making it optimal for cost-sensitive, space-constrained industrial MCU designs requiring robust reset control and efficient field updates.
Availability
SST25WF040-40-5I-SAF is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration backup, IoT edge node OTA update storage, and automotive body control module bootloader applications requiring stable component supply across extended product lifecycles.
Supply support for SST25WF040-40-5I-SAF 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 memory portfolio, emphasizing reliability and low-voltage operation for embedded applications.
The SST25WF040-40-5I-SAF belongs to the Serial Flash 25 Series family, designed specifically for cost-effective, low-power, high-reliability non-volatile storage in resource-constrained microcontroller-based systems.
FAQ
What is the memory organization of the SST25WF040-40-5I-SAF?
The SST25WF040-40-5I-SAF contains 4 Mbit (512 KByte) of SuperFlash memory organized into uniform 4 KByte sectors and supports 32 KByte and 64 KByte overlay erasable blocks. Its address space spans 00000H–7FFFFH, with block protection levels defined by BP2/BP1/BP0 bits in the status register per Table 8 of DS20005016C. This structure enables granular firmware partitioning and secure bootloader isolation.
Does the SST25WF040-40-5I-SAF support Quad SPI or QPI mode?
No, the SST25WF040-40-5I-SAF does not support Quad SPI or QPI mode. It implements a standard four-wire SPI interface (SCK, SI, SO, CE#) compatible with Mode 0 and Mode 3 only. All data transfers are single-bit serial; no additional I/O pins or command sets for quad operation are defined in the datasheet or instruction tables for SST25WF040-40-5I-SAF.
How is write protection implemented on the SST25WF040-40-5I-SAF?
The SST25WF040-40-5I-SAF implements dual-layer write protection: hardware via the WP# pin (enabling BPL bit lock-down) and software via BP2/BP1/BP0 bits in the status register. When WP# is low, BPL=1 prevents further changes to BP bits; when WP# is high, BP bits are freely writable. Protection levels range from no protection to full memory lock, as detailed in Table 8 for the 4 Mbit density.
What is the function of the RST#/HOLD# pin on the SST25WF040-40-5I-SAF?
At power-up, the RST#/HOLD# pin defaults to hardware reset (RST#) functionality. It can be reconfigured to HOLD# mode via the EHLD instruction (0AAH), allowing suspension of ongoing SPI sequences without deselecting the device. The pin reverts to RST# only after power-cycling. This dual-mode capability eliminates the need for external hold logic in systems requiring transaction pausing during interrupt servicing.
Is the SST25WF040-40-5I-SAF still in production or obsolete?
The SST25WF040-40-5I-SAF is an obsolete device per Microchip's official documentation (DS20005016C, dated 11/2014). Microchip recommends contacting its sales team for replacement information. However, Aetrix Electronics maintains legacy supply chain access and offers lifecycle availability coordination, including last-time buy planning and cross-reference support for functional alternatives.
SST25WF040-40-5I-SAF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for SST25WF040-40-5I-SAF through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25WF040-40-5I-SAF 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 reliable?
The price and inventory of SST25WF040-40-5I-SAF 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 is usually 5 days.
3.What payment methods are accepted for SST25WF040-40-5I-SAF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25WF040-40-5I-SAF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25WF040-40-5I-SAF?
SST25WF040-40-5I-SAF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25WF040-40-5I-SAF 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?
For technical support, including SST25WF040-40-5I-SAF 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 requirements.
6.How does Aetrix verify that SST25WF040-40-5I-SAF is sourced from the original manufacturer or authorized distributors?
All SST25WF040-40-5I-SAF 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 meets industry standards.
7.What is the process for return or replacement of SST25WF040-40-5I-SAF?
All SST25WF040-40-5I-SAF units undergo pre-shipment inspection (PSI). If there is an issue with SST25WF040-40-5I-SAF, 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 part is unused and in its original packaging.
Return procedure for SST25WF040-40-5I-SAF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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