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Microchip Technology SST25VF040B-50-4I-SAF
- Part No.:
- SST25VF040B-50-4I-SAF
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SST25VF040B-50-4I-SAF.pdf
- Description:
- IC FLASH 4MBIT SPI 50MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,393
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Product details
Overview
SST25VF040B-50-4I-SAF from Microchip Technology is a 4-Mbit SPI serial Flash memory IC designed for embedded code storage and data logging in microcontroller-based systems. It operates from a single 2.7V–3.6V supply, supports up to 50 MHz clock frequency, delivers 100,000 program/erase cycles, and retains data for >100 years. It is used in industrial control firmware storage where reliable, low-power nonvolatile memory is required.
For engineers reviewing the SST25VF040B-50-4I-SAF datasheet, SST25VF040B-50-4I-SAF pinout, SST25VF040B-50-4I-SAF application, or SST25VF040B-50-4I-SAF equivalent, key selection criteria include SPI Mode 0/3 compatibility, 4-Kbyte sector erase granularity, Auto Address Increment (AAI) programming support, HOLD#/WP# hardware control, and industrial temperature range (–40°C to +85°C).
Technical Context
The SST25VF040B-50-4I-SAF implements a four-wire SPI interface with dual-mode clock polarity support (Mode 0 and Mode 3), enabling interoperability with diverse host controllers. Its SuperFlash® technology uses a split-gate cell architecture with thick-oxide tunneling injector, delivering faster erase times and lower active current than conventional NOR Flash.
It features dedicated hardware control pins - HOLD# for pausing ongoing SPI sequences without chip deselection, and WP# for enabling STATUS register lock-down - alongside software-controlled block protection (BP3–BP0) and BUSY/WEL status bits accessible via RDSR instruction. End-of-write detection is supported both by polling the BUSY bit and by hardware RY/BY# output on SO during AAI mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512 Kbytes), organized as uniform 4-Kbyte sectors, 32-Kbyte and 64-Kbyte overlay blocks |
| Supply Voltage | 2.7V–3.6V - enables direct interfacing with 3.3V logic without level shifting |
| Max Clock Frequency | 50 MHz - supports high-speed High-Speed Read (0BH) with dummy cycle for throughput-critical boot code fetch |
| Endurance | 100,000 program/erase cycles - sufficient for firmware update logging in field-deployed industrial devices |
| Data Retention | >100 years - ensures long-term reliability in unattended embedded applications |
| Active Read Current | 10 mA (typical) - minimizes power draw during frequent configuration reads in battery-backed systems |
| Standby Current | 5 µA (typical) - supports ultra-low-power sleep modes in portable or energy-harvesting designs |
| Erase Times | Sector/Block: 18 ms (typical); Chip Erase: 35 ms (typical) - reduces firmware update latency vs. legacy parallel Flash |
Pinout & Package
Package: 8-contact WSON (6 mm × 5 mm), RoHS-compliant, industrial-grade (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command sequence; high-to-low transition initiates operation |
| SO | Serial Data Output | Outputs data on falling SCK edge; reconfigurable as RY/BY# status indicator during AAI programming when EBSY issued |
| WP# | Write-Protect | Enables/disables BPL bit lock-down; when low, BPL=1 prevents modification of BP3–BP0 bits 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 | Single 2.7V–3.6V supply input; decoupling capacitor (0.1 µF) recommended near pin |
| HOLD# | Hold | Suspends SPI communication mid-sequence without resetting internal address pointer or clock state |
| SCK | Serial Clock | Provides timing reference; inputs sampled on rising edge, outputs driven on falling edge; supports Mode 0 (SCK idle low) and Mode 3 (SCK idle high) |
| SI | Serial Data Input | Accepts commands, addresses, and data MSb-first; latched on rising SCK edge |
Key Features
| Feature | Design Value |
|---|---|
| Auto Address Increment (AAI) Programming | Reduces total programming time for sequential writes by eliminating repeated address transmission - critical for fast firmware patching |
| Flexible Erase Granularity | Independent 4-Kbyte sector, 32-Kbyte block, and 64-Kbyte block erase options enable precise wear leveling and partial updates without full chip erase |
| Hardware End-of-Write Detection | EBSY/DBSY commands configure SO pin as RY/BY# output during AAI, eliminating software polling overhead and simplifying real-time interrupt-driven write completion handling |
| Software Block Protection | BP3–BP0 bits in STATUS register allow configurable protection of upper memory regions (e.g., bootloader section), preventing accidental overwrite during field updates |
| HOLD# Pin Functionality | Allows host MCU to pause ongoing read/write operations (e.g., during interrupt servicing) without losing context or requiring reinitialization |
Applications
| Firmware Storage in PLCs | Secure Bootloader Memory |
|---|---|
Use Scenario: Storing programmable logic controller (PLC) application firmware and configuration parameters that require field updates over CAN or Ethernet interfaces. IC Role / Device Role / Timing Role: Nonvolatile code storage device accessed via SPI during cold boot and runtime firmware validation; supports high-speed read (0BH) for fast startup. Use Value: 50 MHz read speed and 4-Kbyte sector erase enable rapid firmware rollback and delta updates without disrupting control loop timing. | Use Scenario: Holding immutable bootloader code in safety-critical medical devices, where unauthorized modification must be prevented across power cycles. IC Role / Device Role / Timing Role: Secure, write-protected memory segment storing signed bootloader image; accessed during secure boot sequence before application code execution. Use Value: Hardware WP# pin combined with BPL-locked BP bits ensures bootloader region remains protected even if host MCU firmware is compromised. |
| Data Logging in Remote Sensors | Configuration Storage in Industrial Gateways |
Use Scenario: Capturing sensor readings (temperature, pressure, vibration) at 10 Hz in battery-powered environmental monitoring nodes deployed for multi-year service life. IC Role / Device Role / Timing Role: Low-power persistent data buffer; programmed via AAI mode during periodic wake-up windows; erased per-sector to manage wear. Use Value: 5 µA standby current and 100,000-cycle endurance ensure >10-year operational lifetime with daily logging cycles. | Use Scenario: Storing network settings (IP, subnet, TLS certificates), calibration coefficients, and device identity in IIoT gateways operating in harsh factory environments. IC Role / Device Role / Timing Role: Industrial-temperature-rated configuration store accessed during initialization and OTA updates; protected against ESD and voltage transients via robust SOIC/WSON packaging. Use Value: –40°C to +85°C rating and RoHS compliance guarantee stable operation in uncontrolled ambient conditions typical of manufacturing floors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF041A-SSH-T | 4-Mbit density, 85 MHz max clock, 2.7–3.6V, but uses different STATUS register layout and lacks AAI programming | Higher bandwidth read capability, but no hardware-accelerated sequential write - increases firmware update time | Select when maximum read throughput is prioritized over write efficiency and legacy AT25DF driver compatibility exists |
| W25Q40EWUXIE | 4-Mbit density, 133 MHz Dual/Quad SPI, 1.65–1.95V/2.7–3.6V dual supply, includes Quad Enable bit and QPI mode | Supports faster Quad SPI protocols and lower-voltage operation, but requires additional initialization and lacks HOLD# pin | Select for next-gen designs targeting higher bandwidth or ultra-low-voltage operation, accepting added software complexity and loss of hardware hold functionality |
Compared with AT25DF041A-SSH-T and W25Q40EWUXIE, the SST25VF040B-50-4I-SAF uniquely balances industrial temperature tolerance, hardware HOLD#/WP# control, AAI programming, and proven 50 MHz SPI performance - making it optimal for cost-sensitive, reliability-focused embedded systems where deterministic timing and minimal driver changes are essential.
Availability
SST25VF040B-50-4I-SAF is available at Aetrix Electronics and suitable for industrial control firmware storage, secure bootloader implementation, remote sensor data logging, and IIoT gateway configuration management requiring stable component supply across extended product lifecycles.
Supply support for SST25VF040B-50-4I-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 is a leading provider of microcontrollers, analog components, and Flash memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.
The SST25VF040B-50-4I-SAF belongs to Microchip's 25-series Serial Flash family, engineered specifically for cost-effective, low-pin-count nonvolatile storage in resource-constrained embedded systems requiring high reliability and industrial-grade operation.
FAQ
What is the maximum SPI clock frequency supported by the SST25VF040B-50-4I-SAF?
The SST25VF040B-50-4I-SAF supports up to 50 MHz for High-Speed Read (0BH instruction) and 25 MHz for standard Read (03H instruction). This is confirmed in the "Features" section of the DS20005051E datasheet, which states "High-Speed Clock Frequency: Up to 50 MHz". The "-50" suffix in the part number explicitly denotes this 50 MHz rating, distinguishing it from slower variants like the -20 or -33 versions.
Does the SST25VF040B-50-4I-SAF support both SPI Mode 0 and Mode 3?
Yes, the SST25VF040B-50-4I-SAF is explicitly SPI-compatible with both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as stated in the "Features" list and detailed in Section 4.0 of the DS20005051E datasheet. This dual-mode support ensures interoperability with a wide range of microcontrollers and FPGAs without requiring hardware modifications to the SPI peripheral configuration.
What package type does the SST25VF040B-50-4I-SAF use, and what does the "SAF" suffix indicate?
The SST25VF040B-50-4I-SAF uses an 8-contact WSON (6 mm × 5 mm) package. The "SAF" suffix denotes industrial temperature grade (–40°C to +85°C) and RoHS-compliant, halogen-free construction, as defined in Microchip's packaging nomenclature. This is distinct from "SA" (commercial grade) and "SAB" (lead-free SOIC) variants, confirming its suitability for demanding industrial environments.
How does the HOLD# pin function on the SST25VF040B-50-4I-SAF during an active SPI transaction?
When the HOLD# pin is asserted low while CE# is active (low), the SST25VF040B-50-4I-SAF suspends the ongoing SPI sequence - freezing the internal address pointer and clock state - without deselecting the device or resetting logic. SO enters high-impedance, while SI and SCK may be driven to any valid level. Communication resumes upon deasserting HOLD#, preserving full context. This behavior is fully documented in Section 4.1 and Figure 4-2 of DS20005051E.
Can the SST25VF040B-50-4I-SAF be used as a direct replacement for the older SST25VF040B-50-4C-SAF?
No - the SST25VF040B-50-4I-SAF is not a direct replacement for the SST25VF040B-50-4C-SAF due to differing temperature grades: "I" denotes industrial (–40°C to +85°C), while "C" denotes commercial (0°C to +70°C). Although electrically and functionally identical, substituting the industrial-grade part into a commercial-design system may incur unnecessary cost, and using the commercial part in an industrial environment risks parametric failure outside its rated range. Always verify thermal requirements before substitution.
SST25VF040B-50-4I-SAF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 50 MHz
- Write Cycle Time - Word, Page:
- 10µs
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SST25VF040B-50-4I-SAF FAQ
1.How can I place an order for SST25VF040B-50-4I-SAF through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25VF040B-50-4I-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 SST25VF040B-50-4I-SAF reliable?
The price and inventory of SST25VF040B-50-4I-SAF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25VF040B-50-4I-SAF is usually 5 days.
3.What payment methods are accepted for SST25VF040B-50-4I-SAF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25VF040B-50-4I-SAF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25VF040B-50-4I-SAF?
SST25VF040B-50-4I-SAF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25VF040B-50-4I-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 SST25VF040B-50-4I-SAF?
For technical support, including SST25VF040B-50-4I-SAF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25VF040B-50-4I-SAF requirements.
6.How does Aetrix verify that SST25VF040B-50-4I-SAF is sourced from the original manufacturer or authorized distributors?
All SST25VF040B-50-4I-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 SST25VF040B-50-4I-SAF meets industry standards.
7.What is the process for return or replacement of SST25VF040B-50-4I-SAF?
All SST25VF040B-50-4I-SAF units undergo pre-shipment inspection (PSI). If there is an issue with SST25VF040B-50-4I-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 SST25VF040B-50-4I-SAF part is unused and in its original packaging.
Return procedure for SST25VF040B-50-4I-SAF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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