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Microchip Technology SST25VF040B-50-4I-QAF-T
- Part No.:
- SST25VF040B-50-4I-QAF-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
SST25VF040B-50-4I-QAF-T.pdf
- Description:
- IC FLASH 4MBIT SPI 50MHZ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,090
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Product details
Overview
SST25VF040B-50-4I-QAF-T from Microchip Technology is a 4-Mbit SPI serial Flash memory IC with single-supply operation (2.7V–3.6V), 50 MHz max clock frequency, and industrial temperature range (–40°C to +85°C). It features uniform 4-Kbyte sectors, 32-Kbyte and 64-Kbyte overlay blocks, and Auto Address Increment (AAI) programming for accelerated firmware updates in embedded microcontroller boot loaders.
For engineers reviewing the SST25VF040B-50-4I-QAF-T datasheet, SST25VF040B-50-4I-QAF-T pinout, SST25VF040B-50-4I-QAF-T application, or SST25VF040B-50-4I-QAF-T equivalent, key selection criteria include SPI Mode 0/3 compatibility, hardware BUSY status via SO pin during AAI, sector/block erase granularity, software write protection via STATUS register BP bits, and WSON-8 (6 mm × 5 mm) package suitability for space-constrained PCB layouts.
Technical Context
The SST25VF040B-50-4I-QAF-T implements a four-wire SPI interface with dual-mode clock polarity support (Mode 0 and Mode 3), enabling interoperability with diverse host controllers including ARM Cortex-M, PIC, and ESP32 families. Its SuperFlash® technology uses split-gate cells and thick-oxide tunneling to achieve 100,000 program/erase cycles and >100 years data retention without requiring high-voltage assist circuits.
Internal control logic supports simultaneous read-while-write capability only in High-Speed Read mode (0BH command with dummy cycle), while AAI programming requires explicit WREN activation and BUSY polling or hardware RY/BY# status on SO. The HOLD# and WP# pins provide deterministic suspend and lock-down functionality independent of SPI transaction state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512 Kbytes), organized as uniform 4-Kbyte sectors for fine-grained firmware partitioning |
| Interface | SPI-compatible 4-wire bus (CE#, SCK, SI, SO) supporting Mode 0 and Mode 3 timing |
| Max Clock Frequency | 50 MHz - enables High-Speed Read (0BH) with dummy cycle for ≤20 ns access latency |
| Supply Voltage | 2.7V–3.6V - single supply eliminates need for voltage translators in 3.3V systems |
| Erase Endurance | 100,000 cycles (typical) - supports frequent field firmware updates over product lifetime |
| Data Retention | >100 years - ensures bootloader code integrity across extended storage or deployment periods |
| Active Read Current | 10 mA (typical at 50 MHz) - low dynamic power enables battery-backed or energy-harvesting applications |
| Standby Current | 5 µA (typical) - minimizes quiescent draw during system sleep modes |
Pinout & Package
Package: 8-contact WSON (6 mm × 5 mm), RoHS-compliant, moisture sensitivity level (MSL) 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command sequence; high-to-low transition initiates instruction latch |
| SO | Serial Data Output / RY/BY# | Outputs data on falling SCK edge; reconfigurable as hardware busy indicator (0 = busy, 1 = ready) during AAI mode when EBSY (70H) issued |
| WP# | Write-Protect Control | Enables BPL bit lockdown in STATUS register; low = BP3–BP0 bits become read-only; high = full software write protection configurability |
| VSS | Ground Reference | Primary return path for all I/O and core circuitry; requires low-impedance connection to system GND plane |
| VDD | Power Supply | 2.7V–3.6V input; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin per layout guidelines |
| HOLD# | Serial Interface Suspend | Pauses ongoing SPI transfer without resetting internal address pointer; requires CE# active-low and SCK stable during assertion |
| SCK | Serial Clock Input | Timing reference for all SPI transactions; commands/addresses latched on rising edge; SO data valid on falling edge |
| SI | Serial Data Input | Accepts opcodes, addresses, and data MSb-first; sampled on rising SCK edge; tolerant of VIH/VIL during HOLD# active |
Key Features
| Feature | Design Value |
|---|---|
| Auto Address Increment (AAI) Programming | Reduces multi-byte programming time by eliminating repeated address transmission; supports sequential word writes with single ADH command per 2-byte payload |
| Flexible Erase Architecture | Independent 4-Kbyte sector, 32-Kbyte block, and 64-Kbyte block erase options enable selective firmware patching without full chip erase |
| Hardware End-of-Write Detection | SO pin repurposed as RY/BY# status output (via EBSY 70H) eliminates software polling overhead during AAI, improving real-time determinism |
| Software Write Protection | STATUS register BP3–BP0 bits allow granular memory locking (e.g., protect bootloader region 70000H–7FFFFH while leaving app region writable) |
| Hold Function | Preserves internal state and address pointer during SPI suspension, enabling priority interrupt handling without transaction restart logic |
Applications
| Bootloader Storage | Firmware Over-the-Air (OTA) Update |
|---|---|
|
Use Scenario: Storing immutable bootloader code that initializes CPU, configures peripherals, and validates application image checksum before execution. IC Role / Device Role / Timing Role: Nonvolatile storage for first-stage boot code; accessed during cold start and reset recovery with deterministic 50 MHz read timing. Use Value: 4-Kbyte sector granularity allows separate locking of bootloader region (e.g., upper 1/16) while permitting runtime updates to application partition. |
Use Scenario: Receiving encrypted firmware fragments via BLE/Wi-Fi and staging them in external memory prior to authenticated flash commit. IC Role / Device Role / Timing Role: High-throughput write buffer using AAI programming; leverages 7 µs byte program time and hardware RY/BY# for rapid commit verification. Use Value: 32-Kbyte block erase capability enables atomic replacement of functional modules without disrupting adjacent firmware sections. |
| Industrial Sensor Configuration | Medical Device Calibration Data |
|
Use Scenario: Persisting sensor offset/gain coefficients, linearization tables, and operational thresholds across power cycles in programmable logic controllers. IC Role / Device Role / Timing Role: Low-power nonvolatile parameter store; accessed infrequently but requiring guaranteed retention over 10+ years. Use Value: >100 years data retention and 100,000 endurance cycles ensure calibration stability across extended service intervals without recalibration drift. |
Use Scenario: Storing FDA-mandated calibration records, device serial history, and usage logs in portable diagnostic equipment with battery backup. IC Role / Device Role / Timing Role: Tamper-resistant audit trail storage; write-protected via WP#-enabled BPL bit to prevent unauthorized modification. Use Value: Software block protection (BP bits) combined with physical WP# pin enables dual-layer write security compliant with IEC 62304 requirements. |
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, 104 MHz max clock, Quad SPI support, DTR mode, smaller 2×3 mm USON-8 package | Higher bandwidth for XIP execution; quad I/O reduces pin count but requires host controller Quad SPI support | Select W25Q40EW when system demands faster random reads or board space is constrained below 6×5 mm footprint |
| Micron MT25QL04A | 4 Mbit density, 133 MHz max clock, Octal DTR interface, built-in ECC, 8-pin SOIC and WSON packages | Supports execute-in-place (XIP) with lower latency; integrated ECC corrects bit errors without host intervention | Select MT25QL04A when deploying in high-radiation environments or where bit error resilience is critical for safety-critical firmware |
Compared with SST25VF040B-50-4I-QAF-T, W25Q40EW offers higher throughput via Quad SPI but lacks native HOLD#/WP# pin-level control granularity, while MT25QL04A provides superior reliability with ECC and faster clocks but increases BOM cost and requires Octal SPI host compatibility.
Availability
SST25VF040B-50-4I-QAF-T is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, and automotive telematics modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SST25VF040B-50-4I-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 company specializing in microcontrollers, analog devices, and memory solutions, with emphasis on embedded control and connectivity.
The SST25VF040B-50-4I-QAF-T belongs to Microchip's 25 series Serial Flash family, designed specifically for cost-sensitive, space-constrained embedded systems requiring reliable nonvolatile storage with minimal pin count and low power consumption.
FAQ
What is the maximum operating frequency supported by SST25VF040B-50-4I-QAF-T?
The SST25VF040B-50-4I-QAF-T supports up to 50 MHz clock frequency for High-Speed Read operations using the 0BH command with a dummy cycle. Standard Read (03H) is rated to 25 MHz. This 50 MHz capability enables sub-20 ns effective access times in optimized host interfaces, making SST25VF040B-50-4I-QAF-T suitable for real-time firmware fetch in resource-constrained MCUs.
Does SST25VF040B-50-4I-QAF-T support both SPI Mode 0 and Mode 3?
Yes, SST25VF040B-50-4I-QAF-T explicitly supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as confirmed in Section 4.0 of the datasheet. This dual-mode compatibility ensures interoperability with a broad range of microcontrollers-including legacy 8-bit MCUs and modern ARM-based SoCs-without requiring hardware level-shifters or protocol translation.
How does the HOLD# pin function during active SPI communication in SST25VF040B-50-4I-QAF-T?
In SST25VF040B-50-4I-QAF-T, the HOLD# pin suspends ongoing SPI transfers while preserving internal address and state registers. When asserted low (with CE# active), it places SO in high-impedance and halts clock sampling on SCK until HOLD# is deasserted. This allows external interrupts or priority tasks to execute without aborting or restarting the current command sequence-critical for deterministic real-time systems using SST25VF040B-50-4I-QAF-T.
What erase granularities are available in SST25VF040B-50-4I-QAF-T?
SST25VF040B-50-4I-QAF-T provides three distinct erase granularities: uniform 4-Kbyte sectors, 32-Kbyte overlay blocks, and 64-Kbyte overlay blocks. Sector erase uses opcode 20H with A12 addressing; 32-Kbyte block uses 52H with A15; 64-Kbyte block uses D8H with A16. This hierarchy enables precise firmware updates-e.g., patching a driver module (4 KB) without affecting application binaries (64 KB)-maximizing field upgrade efficiency in SST25VF040B-50-4I-QAF-T deployments.
Can SST25VF040B-50-4I-QAF-T be used in industrial temperature environments?
Yes, SST25VF040B-50-4I-QAF-T is specified for industrial temperature range (–40°C to +85°C), as indicated by the "I" suffix in its part number. Its SuperFlash® technology maintains full electrical performance-including 100,000 erase/write cycles and >100 years data retention-across this range. This makes SST25VF040B-50-4I-QAF-T appropriate for deployment in factory automation, outdoor metering, and transportation control systems.
SST25VF040B-50-4I-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (6x5)
SST25VF040B-50-4I-QAF-T FAQ
1.How can I place an order for SST25VF040B-50-4I-QAF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25VF040B-50-4I-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-50-4I-QAF-T reliable?
The price and inventory of SST25VF040B-50-4I-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-50-4I-QAF-T is usually 5 days.
3.What payment methods are accepted for SST25VF040B-50-4I-QAF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25VF040B-50-4I-QAF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25VF040B-50-4I-QAF-T?
SST25VF040B-50-4I-QAF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25VF040B-50-4I-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-50-4I-QAF-T?
For technical support, including SST25VF040B-50-4I-QAF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25VF040B-50-4I-QAF-T requirements.
6.How does Aetrix verify that SST25VF040B-50-4I-QAF-T is sourced from the original manufacturer or authorized distributors?
All SST25VF040B-50-4I-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-50-4I-QAF-T meets industry standards.
7.What is the process for return or replacement of SST25VF040B-50-4I-QAF-T?
All SST25VF040B-50-4I-QAF-T units undergo pre-shipment inspection (PSI). If there is an issue with SST25VF040B-50-4I-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-50-4I-QAF-T part is unused and in its original packaging.
Return procedure for SST25VF040B-50-4I-QAF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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