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Microchip Technology SST25VF040B-50-4C-SAF
- Part No.:
- SST25VF040B-50-4C-SAF
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SST25VF040B-50-4C-SAF.pdf
- Description:
- IC FLASH 4MBIT SPI 50MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,083
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Product details
Overview
SST25VF040B-50-4C-SAF from Microchip Technology is a 4-Mbit SPI serial Flash memory IC with single-supply operation (2.7V–3.6V), SPI Mode 0/3 compatibility, and 50 MHz high-speed read capability. It features uniform 4-Kbyte sectors, 32-Kbyte and 64-Kbyte overlay blocks, and Auto Address Increment (AAI) programming for embedded firmware storage in microcontroller-based systems.
For engineers reviewing the SST25VF040B-50-4C-SAF datasheet, SST25VF040B-50-4C-SAF pinout, SST25VF040B-50-4C-SAF application, or SST25VF040B-50-4C-SAF equivalent, key selection criteria include sector/block erase flexibility, 100,000-cycle endurance, industrial temperature support (–40°C to +85°C), RoHS-compliant WSON-8 packaging, and hardware/software write protection via WP# and STATUS register bits.
Technical Context
The SST25VF040B-50-4C-SAF implements a four-wire SPI interface with dual-mode clock polarity (Mode 0 and Mode 3), enabling interoperability with diverse host controllers. Its SuperFlash® technology uses split-gate cells and thick-oxide tunneling to achieve faster erase times (18 ms sector/35 ms chip) and lower active current (10 mA typical) versus conventional NOR Flash.
Internal architecture includes dedicated I/O buffers, X/Y decoders, and control logic supporting byte program (7 µs), AAI word programming, and three end-of-write detection methods: BUSY bit polling, SO-driven RY/BY# status during AAI, and fixed timing wait states. The HOLD# pin suspends ongoing serial sequences without resetting internal state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512 Kbytes), organized as uniform 4-Kbyte sectors with 32-Kbyte and 64-Kbyte overlay blocks |
| Supply Voltage | 2.7V–3.6V single supply - enables direct interfacing with 3.3V logic without level shifting |
| Max Clock Frequency | 50 MHz - supports high-throughput firmware reads in boot and update scenarios |
| Endurance | 100,000 program/erase cycles - suitable for field-upgradable code and configuration storage |
| Data Retention | Greater than 100 years - ensures long-term reliability in unpowered storage applications |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded systems and automotive body electronics |
| Active Read Current | 10 mA typical at 50 MHz - minimizes power impact during frequent boot or parameter access |
| Standby Current | 5 µA typical - enables ultra-low-power sleep modes in battery-backed devices |
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 execution to prevent premature termination |
| SO | Serial Data Output | Outputs data on falling SCK edge; reconfigurable as RY/BY# status indicator during AAI programming |
| WP# | Write-Protect Input | Enables/disables STATUS register lock-down (BPL bit); controls software block protection activation |
| VSS | Ground | Reference return path for all digital and analog circuitry; requires low-impedance PCB connection |
| VDD | Power Supply | 2.7V–3.6V supply input; bypass capacitor (0.1 µF) recommended adjacent to pin |
| HOLD# | Serial Hold Control | Suspends SPI communication mid-sequence without resetting address pointer or internal state |
| SCK | Serial Clock | Timing reference for SI/SO; rising edge latches inputs, falling edge clocks outputs |
| SI | Serial Data Input | Accepts commands, addresses, and data MSb-first; sampled on rising SCK edge |
Key Features
| Feature | Design Value |
|---|---|
| Auto Address Increment (AAI) Programming | Reduces total programming time by eliminating repeated address transmission for sequential word writes |
| Hardware End-of-Write Detection | SO pin outputs real-time RY/BY# status during AAI, removing software polling overhead |
| Flexible Block Protection | Four BP bits enable configurable protection of upper 1/16 to full 4-Mbit array, with lock-down via BPL bit |
| Uniform Erase Granularity | Independent 4-Kbyte sector, 32-Kbyte block, and 64-Kbyte block erase options optimize wear leveling and update efficiency |
| Hold Functionality | Preserves internal state during multi-master arbitration or host interrupt servicing without command restart |
Applications
| Boot Code Storage | Firmware Update Storage |
|---|---|
Use Scenario: Stores primary bootloader and application firmware executed directly by an MCU upon power-up. IC Role / Device Role / Timing Role: Non-volatile code storage with fast 50 MHz read access and wrap-around addressing for continuous instruction fetch. Use Value: Enables reliable cold-start operation and reduces boot latency compared to slower parallel Flash or EEPROM alternatives. | Use Scenario: Holds field-upgradable firmware images and patch binaries in IoT gateways and industrial PLCs. IC Role / Device Role / Timing Role: Secure, sector-erasable storage supporting AAI programming for rapid image writes and BP-bit lockdown post-update. Use Value: Allows safe over-the-air updates with atomic sector erase and verified write completion via BUSY polling or RY/BY# signaling. |
| Configuration Parameter Storage | Calibration Data Retention |
Use Scenario: Maintains runtime-configurable settings (network IDs, sensor thresholds, UI preferences) across power cycles. IC Role / Device Role / Timing Role: Low-power, byte-programmable non-volatile memory accessed infrequently but requiring high endurance. Use Value: Delivers 100,000-cycle endurance and 100-year retention-exceeding requirements for decades-long deployment in medical or infrastructure equipment. | Use Scenario: Stores factory-calibrated coefficients for precision ADCs, temperature sensors, and motor drivers. IC Role / Device Role / Timing Role: Write-once or infrequent-write storage with hardware write protection (WP#) and STATUS register lock-down. Use Value: Prevents accidental overwrite of critical calibration data using dual-layer protection: physical WP# pin and software BPL-enabled BP bits. |
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 density, 85 MHz max clock, 2.7–3.6V, but uses different STATUS register layout and lacks AAI programming | Higher read throughput but no AAI acceleration; requires modified driver for status bit interpretation | Preferred where maximum read speed is critical and firmware update patterns favor standard byte programming |
| W25Q40EWUXIE | 4-Mbit density, 104 MHz quad SPI, 1.65–1.95V/2.7–3.6V dual supply, supports QPI/DTR modes | Requires quad I/O routing and voltage translation for 3.3V hosts; not pin-compatible | Selected when migrating to higher-bandwidth interfaces and future-proofing for quad-capable controllers |
Compared with AT25DF041A-SSH-T and W25Q40EWUXIE, the SST25VF040B-50-4C-SAF offers unique AAI programming and hardware RY/BY# signaling for deterministic firmware update timing, while maintaining proven industrial temperature reliability and simple 4-wire SPI integration without layout changes.
Availability
SST25VF040B-50-4C-SAF is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, and medical device boot storage requiring stable component supply and long-term lifecycle assurance.
Supply support for SST25VF040B-50-4C-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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with emphasis on reliability, low-power design, and embedded system integration.
The SST25VF040B-50-4C-SAF belongs to Microchip's 25-series Serial Flash product line, engineered for cost-sensitive, space-constrained embedded applications requiring robust non-volatile storage with industrial-grade temperature performance and simplified SPI interface.
FAQ
What is the package type and footprint of the SST25VF040B-50-4C-SAF?
The SST25VF040B-50-4C-SAF uses an 8-contact WSON package measuring 6 mm × 5 mm with exposed pad. It is RoHS-compliant and rated MSL3. Pinout matches standard SPI Flash layouts: CE#, SO, WP#, VSS, VDD, HOLD#, SCK, SI - identical to industry-standard 8-pin SOIC but in a smaller, thermally enhanced footprint. This allows drop-in replacement in space-constrained designs without board rework.
Does the SST25VF040B-50-4C-SAF support both SPI Mode 0 and Mode 3?
Yes, the SST25VF040B-50-4C-SAF explicitly supports 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. This dual-mode compatibility ensures interoperability with a wide range of microcontrollers, including legacy and newer ARM Cortex-M and PIC MCUs, without requiring clock polarity configuration changes.
How does the HOLD# function operate in the SST25VF040B-50-4C-SAF?
The HOLD# pin in the SST25VF040B-50-4C-SAF pauses an ongoing SPI transaction without resetting internal address counters or command state. When CE# is low and HOLD# transitions low coincident with SCK's low state, the device enters hold mode: SO goes high-impedance, while SI and SCK may float. Communication resumes when HOLD# returns high during SCK's low phase. This enables seamless multi-master arbitration and host interrupt handling without command restart overhead.
What write protection mechanisms are implemented in the SST25VF040B-50-4C-SAF?
The SST25VF040B-50-4C-SAF implements three-tiered write protection: (1) hardware via WP# pin enabling STATUS register lock-down, (2) software via BP0–BP3 bits in the STATUS register to protect memory regions (upper 1/16 to full array), and (3) BPL bit to freeze BP bits once set. Default power-up state protects all blocks (BP2–BP0 = 111), and WP# low enables BPL enforcement. This layered approach prevents accidental or malicious firmware corruption in safety-critical systems.
Can the SST25VF040B-50-4C-SAF be used in automotive applications?
The SST25VF040B-50-4C-SAF is qualified for industrial temperature range (–40°C to +85°C) and meets RoHS requirements, making it suitable for under-hood automotive body electronics (e.g., lighting control, door modules, HVAC) where extended temperature tolerance and long-term data retention (>100 years) are required. While not AEC-Q100 certified, its proven reliability in industrial deployments and SuperFlash® endurance (100,000 cycles) support automotive Tier-2 subsystem use with appropriate system-level qualification.
SST25VF040B-50-4C-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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SST25VF040B-50-4C-SAF FAQ
1.How can I place an order for SST25VF040B-50-4C-SAF through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25VF040B-50-4C-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-50-4C-SAF reliable?
The price and inventory of SST25VF040B-50-4C-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-50-4C-SAF is usually 5 days.
3.What payment methods are accepted for SST25VF040B-50-4C-SAF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25VF040B-50-4C-SAF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25VF040B-50-4C-SAF?
SST25VF040B-50-4C-SAF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25VF040B-50-4C-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-50-4C-SAF?
For technical support, including SST25VF040B-50-4C-SAF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25VF040B-50-4C-SAF requirements.
6.How does Aetrix verify that SST25VF040B-50-4C-SAF is sourced from the original manufacturer or authorized distributors?
All SST25VF040B-50-4C-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-50-4C-SAF meets industry standards.
7.What is the process for return or replacement of SST25VF040B-50-4C-SAF?
All SST25VF040B-50-4C-SAF units undergo pre-shipment inspection (PSI). If there is an issue with SST25VF040B-50-4C-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-50-4C-SAF part is unused and in its original packaging.
Return procedure for SST25VF040B-50-4C-SAF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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