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Microchip Technology SST25VF040B-50-4C-QAF-T
- Part No.:
- SST25VF040B-50-4C-QAF-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
SST25VF040B-50-4C-QAF-T.pdf
- Description:
- IC FLASH 4MBIT SPI 50MHZ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,153
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Product details
Overview
SST25VF040B-50-4C-QAF-T from Microchip Technology is a 4-Mbit SPI serial Flash memory IC with SuperFlash® technology, operating at 2.7V–3.6V supply, supporting up to 50 MHz clock frequency, featuring uniform 4-Kbyte sectors and 32/64-Kbyte overlay blocks, and used for firmware storage in microcontroller-based embedded systems.
For engineers reviewing the SST25VF040B-50-4C-QAF-T datasheet, SST25VF040B-50-4C-QAF-T pinout, SST25VF040B-50-4C-QAF-T application, or SST25VF040B-50-4C-QAF-T equivalent, key selection considerations include SPI Mode 0/3 compatibility, hardware/software write protection via WP# and STATUS register, AAI programming capability, HOLD# suspend functionality, and industrial temperature range support.
Technical Context
The SST25VF040B-50-4C-QAF-T implements a four-wire SPI interface (CE#, SCK, SI, SO) with dual-mode timing (Mode 0 and Mode 3), enabling interoperability with diverse host controllers. Its internal architecture uses split-gate SuperFlash® cells with thick-oxide tunneling injectors, delivering enhanced endurance and data retention over standard NOR Flash.
It supports three erase granularities-4-Kbyte sectors, 32-Kbyte blocks, and 64-Kbyte blocks-and features Auto Address Increment (AAI) word programming to reduce sequential write overhead. End-of-write detection is implemented via BUSY bit polling or hardware RY/BY# status output on SO during AAI mode when enabled by EBSY command.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512 Kbytes), organized as uniform 4-Kbyte sectors for fine-grained firmware updates |
| Supply Voltage | 2.7V–3.6V - compatible with 3.3V logic systems without level shifting |
| Max Clock Frequency | 50 MHz - enables high-speed read operations (High-Speed Read instruction 0BH) |
| Endurance | 100,000 program/erase cycles - sufficient for field firmware upgrades over product lifetime |
| Data Retention | Greater than 100 years - ensures long-term reliability in unpowered storage |
| Operating Temp | –40°C to +85°C (Industrial grade) - validated for harsh environmental deployment |
| Active Read Current | 10 mA typical - low power consumption during boot code fetch |
| Standby Current | 5 µA typical - minimal quiescent draw in system sleep modes |
Pinout & Package
Package: 8-contact WSON (6 mm × 5 mm), RoHS-compliant, thermally enhanced for compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command sequence; deassertion resets internal logic |
| SO | Serial Data Output / RY/BY# | Outputs data on falling SCK edge; reconfigurable as Ready/Busy indicator during AAI mode via EBSY/DBSY commands |
| WP# | Write-Protect Control | Enables/disables STATUS register lock-down (BPL bit); controls software block protection activation |
| VSS | Ground Reference | System ground return path; required for stable biasing of internal circuitry |
| VDD | Power Supply | 2.7V–3.6V main supply; powers core logic, memory array, and I/O buffers |
| HOLD# | Serial Interface Suspend | Pauses ongoing SPI transaction without deselecting device or resetting clock state; requires CE# active-low |
| SCK | Serial Clock Input | Timing reference for all SPI transfers; rising edge latches input (SI), falling edge outputs data (SO) |
| SI | Serial Data Input | Accepts opcodes, addresses, and data; MSb-first, sampled on rising SCK edge |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Technology | Split-gate cell design with thick-oxide injector enables lower program current and faster erase vs. conventional NOR Flash |
| Auto Address Increment (AAI) | Reduces total programming time for multi-byte writes by eliminating repeated address transmission overhead |
| Dual SPI Mode Support | Compatible with both Mode 0 (SCK idle low) and Mode 3 (SCK idle high), easing integration with varied MCU peripherals |
| Flexible Block Protection | Software-configurable BP3–BP0 bits protect 1/16 to full memory array; BPL bit locks protection settings permanently when WP# is low |
| HOLD# Functionality | Allows temporary suspension of SPI communication (e.g., during interrupt servicing) without losing command context or requiring reinitialization |
| Hardware RY/BY# Output | SO pin repurposed as real-time busy status during AAI programming, eliminating need for STATUS register polling |
Applications
| Boot Code Storage | Firmware Update Storage |
|---|---|
Use Scenario: Stores bootloader and initial firmware image executed at MCU power-up. IC Role / Device Role / Timing Role: Non-volatile code storage accessed via SPI during cold start and reset sequences. Use Value: Enables reliable, fast boot from 50 MHz High-Speed Read mode; sector erase allows safe in-field bootloader updates. | Use Scenario: Holds field-upgradable application firmware images downloaded over CAN, USB, or wireless interfaces. IC Role / Device Role / Timing Role: Secure, protected storage partitioned using BP bits to prevent accidental overwrite of critical sections. Use Value: 100,000-cycle endurance and 100-year retention ensure long-term update viability across product lifecycle. |
| Configuration Parameter Storage | Industrial HMI Display Memory |
Use Scenario: Retains calibration data, user preferences, and runtime configuration across power cycles in PLCs and sensors. IC Role / Device Role / Timing Role: Low-power, byte-programmable non-volatile memory accessed intermittently during operation. Use Value: 5 µA standby current minimizes system energy budget; HOLD# allows pause during real-time control interrupts. | Use Scenario: Stores display assets (fonts, icons, UI bitmaps) for industrial human-machine interface panels. IC Role / Device Role / Timing Role: High-bandwidth SPI slave providing burst-read graphics data to display controller. Use Value: 50 MHz clock support enables rapid asset loading; 4-Kbyte sector erase permits partial UI updates without full memory wipe. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI serial Flash applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF041A-SSH-T | 4-Mbit SPI Flash, 85 MHz max clock, 2.7–3.6V, but lacks HOLD# pin and AAI programming | Higher speed read but no suspend capability; less suitable for interrupt-sensitive real-time systems | Prefer SST25VF040B-50-4C-QAF-T where HOLD# or AAI is required for deterministic timing control |
| W25Q40EWUXIE | 4-Mbit SPI Flash, 133 MHz Quad SPI capable, includes Quad I/O mode and deep power-down, but uses different STATUS register layout and protection scheme | Supports faster Quad Read but requires host driver changes; no native HOLD# function | Choose SST25VF040B-50-4C-QAF-T for drop-in replacement in legacy designs relying on HOLD#/WP# pin behavior and AAI workflow |
Compared with AT25DF041A-SSH-T and W25Q40EWUXIE, the SST25VF040B-50-4C-QAF-T uniquely combines industrial temperature rating, HOLD# suspend, AAI programming, and simple dual-mode SPI compatibility-making it optimal for cost-sensitive, interrupt-aware embedded systems requiring proven reliability without architectural redesign.
Availability
SST25VF040B-50-4C-QAF-T is available at Aetrix Electronics and suitable for boot code storage, firmware update storage, and configuration parameter storage requiring stable component supply and long-term industrial-grade availability.
Supply support for SST25VF040B-50-4C-QAF-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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and memory solutions, with global design and manufacturing infrastructure.
The SST25VF040B-50-4C-QAF-T belongs to Microchip's 25-series Serial Flash family, designed specifically for space-constrained embedded systems needing reliable, low-pin-count non-volatile storage with robust write protection and industrial temperature resilience.
FAQ
What is the maximum clock frequency supported by the SST25VF040B-50-4C-QAF-T?
The SST25VF040B-50-4C-QAF-T supports up to 50 MHz for High-Speed Read operations using instruction 0BH. Standard Read (03H) is rated to 25 MHz. This 50 MHz capability enables rapid firmware loading and graphics asset retrieval in time-critical embedded applications, and is explicitly confirmed in the DS20005051E datasheet Section 5.2.
Does the SST25VF040B-50-4C-QAF-T support both SPI Mode 0 and Mode 3?
Yes, the SST25VF040B-50-4C-QAF-T is fully compatible with both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as stated in the Features section and Section 4.0 of the DS20005051E datasheet. This dual-mode support simplifies integration with diverse microcontroller SPI peripherals without requiring hardware or firmware adaptation.
What package type is used for the SST25VF040B-50-4C-QAF-T?
The SST25VF040B-50-4C-QAF-T uses an 8-contact WSON package measuring 6 mm × 5 mm, as specified in the Packages section of DS20005051E. This surface-mount, leadless package provides thermal efficiency and board-space savings ideal for compact industrial and automotive modules.
How does write protection work on the SST25VF040B-50-4C-QAF-T?
The SST25VF040B-50-4C-QAF-T implements dual-layer write protection: hardware via the WP# pin (enabling BPL lock-down of STATUS register bits) and software via BP3–BP0 bits that define protected memory regions. Table 4-3 in DS20005051E details how BP bits configure protection from upper 1/16 to full memory array, with default power-up state protecting all blocks.
What is the purpose of the HOLD# pin on the SST25VF040B-50-4C-QAF-T?
The HOLD# pin on the SST25VF040B-50-4C-QAF-T suspends an ongoing SPI transaction without deselecting the device or resetting internal state - critical for handling MCU interrupts during flash access. As described in Section 4.1, HOLD# must be asserted while CE# is active-low, and SO enters high-impedance during hold, preserving bus integrity.
SST25VF040B-50-4C-QAF-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-WDFN Exposed Pad
- 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-WSON (6x5)
SST25VF040B-50-4C-QAF-T FAQ
1.How can I place an order for SST25VF040B-50-4C-QAF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25VF040B-50-4C-QAF-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-QAF-T reliable?
The price and inventory of SST25VF040B-50-4C-QAF-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-QAF-T is usually 5 days.
3.What payment methods are accepted for SST25VF040B-50-4C-QAF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25VF040B-50-4C-QAF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25VF040B-50-4C-QAF-T?
SST25VF040B-50-4C-QAF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25VF040B-50-4C-QAF-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-QAF-T?
For technical support, including SST25VF040B-50-4C-QAF-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-QAF-T requirements.
6.How does Aetrix verify that SST25VF040B-50-4C-QAF-T is sourced from the original manufacturer or authorized distributors?
All SST25VF040B-50-4C-QAF-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-QAF-T meets industry standards.
7.What is the process for return or replacement of SST25VF040B-50-4C-QAF-T?
All SST25VF040B-50-4C-QAF-T units undergo pre-shipment inspection (PSI). If there is an issue with SST25VF040B-50-4C-QAF-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-QAF-T part is unused and in its original packaging.
Return procedure for SST25VF040B-50-4C-QAF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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