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Microchip Technology SST25VF040B-50-4C-S2AF-T
- Part No.:
- SST25VF040B-50-4C-S2AF-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SST25VF040B-50-4C-S2AF-T.pdf
- Description:
- IC FLASH 4MBIT SPI 50MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,795
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Product details
Overview
SST25VF040B-50-4C-S2AF-T from Microchip Technology is a 4-Mbit SPI serial Flash memory IC with quad-wire interface, designed for embedded firmware storage and code execution in microcontroller-based systems. It operates at 2.7V–3.6V, supports up to 50 MHz clock frequency, delivers 100,000 program/erase cycles, and retains data >100 years - enabling reliable boot code storage in industrial controllers and IoT edge nodes.
For engineers reviewing the SST25VF040B-50-4C-S2AF-T datasheet, SST25VF040B-50-4C-S2AF-T pinout, SST25VF040B-50-4C-S2AF-T application, or SST25VF040B-50-4C-S2AF-T equivalent, key selection criteria include SPI Mode 0/3 compatibility, 4-Kbyte sector erase granularity, Auto Address Increment (AAI) programming efficiency, HOLD#/WP# hardware control, and WSON-8 (6 mm × 5 mm) package suitability for space-constrained PCB layouts.
Technical Context
The SST25VF040B-50-4C-S2AF-T implements a four-wire SPI interface with dual-mode clock polarity support (Mode 0 and Mode 3), enabling interoperability with diverse host MCUs. Its SuperFlash® split-gate cell architecture enables single-supply 2.7V–3.6V operation, fast byte programming (7 µs typical), and low active current (10 mA typical) without requiring high-voltage assist circuits.
It integrates hardware-level suspend/resume via HOLD# pin and configurable write protection via WP#-controlled STATUS register lock-down (BPL bit), supporting robust firmware update sequences. Erase flexibility includes uniform 4-Kbyte sectors, 32-Kbyte blocks, and 64-Kbyte blocks - all software-addressable with dedicated opcodes and no external voltage programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512 Kbytes), organized as uniform 4-Kbyte erasable sectors |
| Supply Voltage | 2.7V–3.6V - enables direct connection to 3.3V logic rails without level-shifting |
| Max Clock Frequency | 50 MHz - supports high-speed read via High-Speed Read (0BH) instruction with dummy cycle |
| Endurance | 100,000 program/erase cycles - sufficient for field firmware updates over product lifetime |
| Data Retention | >100 years at +25°C - ensures long-term integrity of stored bootloader or calibration data |
| Active Read Current | 10 mA typical - minimizes power draw during code fetch in battery-powered devices |
| Standby Current | 5 µA typical - enables ultra-low-power sleep modes in always-on edge sensors |
Pinout & Package
Package: 8-contact WSON (6 mm × 5 mm), RoHS-compliant, moisture-sensitive level 3 (MSL3).
| 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 | Drives data on falling SCK edge; reconfigurable as RY/BY# status output during AAI programming when EBSY issued |
| WP# | Write-Protect Input | Enables/disables STATUS register lock-down (BPL); low = BPL bit controls BPx write-protection persistence |
| VSS | Ground Reference | System ground return path; requires low-impedance connection to minimize noise coupling into SPI signals |
| VDD | Power Supply | 2.7V–3.6V supply input; decoupling capacitor (0.1 µF) required within 5 mm of pin per layout guidelines |
| HOLD# | Serial Interface Suspend | Pauses ongoing SPI transaction without resetting internal address pointer or clock state; requires CE# active-low |
| SCK | Serial Clock Input | Timing reference for SI sampling (rising edge) and SO output (falling edge); supports Mode 0 (idle low) and Mode 3 (idle high) |
| SI | Serial Data Input | Accepts commands, addresses, and data MSb-first; latched on rising SCK edge; high-impedance when HOLD# active |
Key Features
| Feature | Design Value |
|---|---|
| Auto Address Increment (AAI) Programming | Reduces multi-byte programming time 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 - enables selective firmware module updates without full chip erase |
| Hardware End-of-Write Detection | SO pin repurposed as RY/BY# status during AAI via EBSY (70H) command - eliminates polling overhead and improves real-time determinism |
| Software Block Protection | BP3–BP0 bits in STATUS register allow configurable memory region locking (e.g., upper 1/2 or all blocks), preventing accidental overwrite of bootloader |
| HOLD# Pin Functionality | Allows interruption of SPI sequences (e.g., during interrupt servicing) without losing context - preserves address pointer and command state |
Applications
| Firmware Storage in MCU-Based Controllers | Boot Code Storage for Industrial PLCs |
|---|---|
Use Scenario: Storing application firmware and configuration data for ARM Cortex-M4-based motor drives operating in harsh factory environments. IC Role / Device Role / Timing Role: Non-volatile code storage accessed via SPI during cold boot and runtime firmware updates; supports 50 MHz reads for fast startup. Use Value: 100-year data retention and 100,000-cycle endurance ensure firmware integrity across 15+ year equipment lifecycles without field replacement. |
Use Scenario: Holding certified bootloader and safety-critical firmware in IEC 61508-compliant programmable logic controllers. IC Role / Device Role / Timing Role: Secure, write-protected boot memory with hardware (WP#) and software (BPx/BPL) protection layers; erased only during authorized firmware upgrades. Use Value: Uniform 4-Kbyte sector erase allows incremental update of non-safety partitions while preserving locked bootloader region - meeting SIL2 functional safety requirements. |
| Configuration Memory for IoT Edge Sensors | Firmware Image Storage in Network Routers |
Use Scenario: Retaining calibrated sensor offsets, network credentials, and OTA update metadata in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Low-power configuration store accessed intermittently; leverages 5 µA standby current and HOLD#-enabled rapid wake/resume. Use Value: Ultra-low standby current extends 2xAA battery life beyond 5 years; AAI programming cuts OTA update time by ~40% vs. byte-program mode. |
Use Scenario: Hosting multiple firmware images (primary, backup, recovery) in enterprise-grade Ethernet switches requiring zero-downtime failover. IC Role / Device Role / Timing Role: Dual-image storage partitioned across 64-Kbyte blocks; enables atomic swap via block erase + program sequence. Use Value: 64-Kbyte block erase (18 ms typical) allows sub-200ms firmware rollback - meeting carrier-grade 99.999% uptime SLAs. |
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 |
|---|---|---|---|
| Winbond W25Q40EW | 4 Mbit density, 1.65V–3.6V supply, 104 MHz max clock, Quad SPI support (not present in SST25VF040B-50-4C-S2AF-T) | Supports QPI and DTR modes for higher throughput; lacks HOLD# pin and AAI programming | Choose for bandwidth-critical applications needing >50 MHz effective throughput; avoid if HOLD# or AAI are required in legacy design |
| ON Semiconductor LE25U40CMC-50G | 4 Mbit density, 2.3V–3.6V supply, 50 MHz max clock, identical pinout (WSON-8), but no AAI mode or HOLD# functionality | Offers lower VMIN (2.3V) for wider brown-out tolerance; uses standard byte-program only - no AAI acceleration | Choose for cost-sensitive designs where AAI and HOLD# are unused; verify STATUS register BP bit behavior matches SST25VF040B-50-4C-S2AF-T |
Compared with Winbond W25Q40EW and ON Semiconductor LE25U40CMC-50G, the SST25VF040B-50-4C-S2AF-T uniquely combines HOLD#-enabled SPI suspension, AAI programming for reduced firmware update latency, and robust 2.7V–3.6V operation - making it optimal for deterministic, resource-constrained embedded systems where timing predictability and legacy SPI compatibility are prioritized over raw speed or ultra-low voltage.
Availability
SST25VF040B-50-4C-S2AF-T is available at Aetrix Electronics and suitable for industrial controllers, IoT edge sensors, and network infrastructure equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SST25VF040B-50-4C-S2AF-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 is a global semiconductor company specializing in microcontrollers, analog components, and memory solutions for embedded control applications.
The SST25VF040B-50-4C-S2AF-T belongs to Microchip's Serial Flash memory product line, engineered for high-reliability, low-power, and SPI-compatible firmware storage in industrial, automotive, and consumer electronics.
FAQ
What is the maximum clock frequency supported by SST25VF040B-50-4C-S2AF-T?
The SST25VF040B-50-4C-S2AF-T supports up to 50 MHz for High-Speed Read operations using the 0BH instruction with a dummy cycle. Standard Read (03H) is rated to 25 MHz. This 50 MHz capability enables faster code execution from flash in performance-sensitive applications such as real-time motor control firmware loading.
Does SST25VF040B-50-4C-S2AF-T support both SPI Mode 0 and Mode 3?
Yes, the SST25VF040B-50-4C-S2AF-T is fully compatible with both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). The device samples SI on the rising edge and drives SO on the falling edge of SCK in both modes, ensuring interoperability with a wide range of host microcontrollers without protocol translation.
How does the HOLD# pin function in SST25VF040B-50-4C-S2AF-T?
The HOLD# pin in SST25VF040B-50-4C-S2AF-T suspends an ongoing SPI transaction without deselecting the device or resetting internal state. When asserted low (with CE# active), it places SO in high-impedance while preserving the address pointer and command context - enabling deterministic interrupt handling in time-critical embedded systems.
What erase options are available on SST25VF040B-50-4C-S2AF-T?
The SST25VF040B-50-4C-S2AF-T provides three erase granularities: uniform 4-Kbyte sectors (20H), 32-Kbyte overlay blocks (52H), and 64-Kbyte overlay blocks (D8H). All are executed via dedicated opcodes and require prior Write Enable (06H). Chip Erase (60H/C7H) is also supported, but only when all block protection bits (BP3–BP0) are cleared to '0'.
Is SST25VF040B-50-4C-S2AF-T pin-compatible with other WSON-8 SPI Flash devices?
The SST25VF040B-50-4C-S2AF-T uses the industry-standard 8-contact WSON (6 mm × 5 mm) footprint with pin 1 marked, matching common WSON-8 layouts. However, pin compatibility does not guarantee functional or timing equivalence - e.g., Winbond W25Q40EW shares the same package but lacks HOLD# and AAI features present in SST25VF040B-50-4C-S2AF-T.
SST25VF040B-50-4C-S2AF-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SST25VF040B-50-4C-S2AF-T FAQ
1.How can I place an order for SST25VF040B-50-4C-S2AF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25VF040B-50-4C-S2AF-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 SST25VF040B-50-4C-S2AF-T reliable?
The price and inventory of SST25VF040B-50-4C-S2AF-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25VF040B-50-4C-S2AF-T is usually 5 days.
3.What payment methods are accepted for SST25VF040B-50-4C-S2AF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25VF040B-50-4C-S2AF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25VF040B-50-4C-S2AF-T?
SST25VF040B-50-4C-S2AF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25VF040B-50-4C-S2AF-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 SST25VF040B-50-4C-S2AF-T?
For technical support, including SST25VF040B-50-4C-S2AF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25VF040B-50-4C-S2AF-T requirements.
6.How does Aetrix verify that SST25VF040B-50-4C-S2AF-T is sourced from the original manufacturer or authorized distributors?
All SST25VF040B-50-4C-S2AF-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 SST25VF040B-50-4C-S2AF-T meets industry standards.
7.What is the process for return or replacement of SST25VF040B-50-4C-S2AF-T?
All SST25VF040B-50-4C-S2AF-T units undergo pre-shipment inspection (PSI). If there is an issue with SST25VF040B-50-4C-S2AF-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 SST25VF040B-50-4C-S2AF-T part is unused and in its original packaging.
Return procedure for SST25VF040B-50-4C-S2AF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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