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Microchip Technology SST25VF040B-50-4C-QAF
- Part No.:
- SST25VF040B-50-4C-QAF
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
SST25VF040B-50-4C-QAF.pdf
- Description:
- IC FLASH 4MBIT SPI 50MHZ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:256
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Product details
Overview
SST25VF040B-50-4C-QAF 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 resource-constrained systems. It operates from 2.7V–3.6V, supports up to 50 MHz clock frequency, delivers 10 mA typical active read current, and features uniform 4-Kbyte sectors and 64-Kbyte overlay blocks - enabling reliable boot code storage in industrial microcontroller applications.
For engineers reviewing the SST25VF040B-50-4C-QAF datasheet, SST25VF040B-50-4C-QAF pinout, SST25VF040B-50-4C-QAF application, or SST25VF040B-50-4C-QAF equivalent, key selection criteria include SPI Mode 0/3 compatibility, hardware/software write protection granularity, AAI programming efficiency, and commercial temperature range (0°C to +70°C) with RoHS-compliant 8-contact WSON (6 mm × 5 mm) packaging.
Technical Context
The SST25VF040B-50-4C-QAF implements a four-wire SPI-compatible interface using proprietary SuperFlash® technology with split-gate cell design and thick-oxide tunneling injector, delivering superior endurance (100,000 program/erase cycles) and >100-year data retention. Its control logic supports dual SPI modes (0 and 3), auto-address increment (AAI) word programming, and hardware RY/BY# status output on SO during AAI via EBSY/DBSY commands.
Memory organization comprises 1024 uniform 4-Kbyte sectors, grouped into 128 × 32-Kbyte blocks and 64 × 64-Kbyte blocks. The STATUS register includes BUSY, WEL, BP0–BP3, AAI, and BPL bits - enabling fine-grained software block protection and lock-down control via WP# pin and WRSR instruction under defined voltage and timing conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512 Kbytes), organized as 1024 × 4-Kbyte sectors |
| Supply Voltage | 2.7V–3.6V single supply - enables direct interfacing with 3.3V microcontrollers without level shifting |
| Max Clock Frequency | 50 MHz - supports high-speed High-Speed Read (0BH) with dummy cycle for fast firmware fetch |
| Endurance | 100,000 program/erase cycles - sufficient for field firmware updates over product lifetime |
| Data Retention | Greater than 100 years - ensures long-term reliability in unpowered storage |
| Active Read Current | 10 mA typical at 50 MHz - minimizes power draw during code execution from XIP-capable hosts |
| Standby Current | 5 µA typical - supports ultra-low-power sleep modes in battery-backed systems |
| Operating Temperature | 0°C to +70°C (Commercial grade) - validated for use in office, consumer, and non-extended industrial environments |
Pinout & Package
Package: 8-contact WSON (6 mm × 5 mm), RoHS-compliant, moisture-sensitive level 3 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command sequence - enables multi-device SPI bus sharing |
| SO | Serial Data Output / RY/BY# (reconfigurable) | Outputs data on falling SCK edge; reconfigured as hardware busy indicator during AAI mode via EBSY command |
| WP# | Write-Protect Control | Enables/disables STATUS register lock-down (BPL bit); when low, restricts modification of BP0–BP3 unless BPL = 0 |
| VSS | Ground Reference | Primary return path for all internal circuitry and I/O buffers - requires low-impedance PCB connection |
| VDD | Power Supply Input | Accepts 2.7V–3.6V; decoupling capacitor (0.1 µF) required near pin for stable read/write operation |
| HOLD# | Serial Interface Suspend | Pauses ongoing SPI transaction without deselecting device - preserves internal address pointer and state |
| SCK | Serial Clock Input | Timing reference for SI/SO; rising edge latches input, falling edge shifts out output - supports Mode 0 (SCK idle low) and Mode 3 (SCK idle high) |
| SI | Serial Data Input | Receives opcodes, addresses, and data MSb-first; sampled on rising SCK edge - compatible with standard SPI master peripherals |
Key Features
| Feature | Design Value |
|---|---|
| Auto Address Increment (AAI) Programming | Reduces total programming time by eliminating repeated address transmission - supports sequential word writes with single ADH command per 2-byte payload |
| Flexible Erase Architecture | Three granular erase options - 4-Kbyte sector (fastest partial update), 32-Kbyte block (mid-size patch), or 64-Kbyte block (full firmware segment) - optimizes wear leveling and update latency |
| Dual SPI Mode Support | Native compatibility with both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) - eliminates need for external mode translation logic |
| Hardware End-of-Write Detection | SO pin reconfigured as RY/BY# via EBSY (70H) command - enables real-time busy monitoring without STATUS register polling overhead |
| Software Block Protection | BP0–BP3 bits in STATUS register define 7 protection levels (none to full array), with BPL bit enabling permanent lockdown - prevents accidental firmware corruption during field updates |
| Low-Power Standby | 5 µA typical current draw in standby - extends battery life in portable diagnostic tools and IoT edge nodes with infrequent firmware access |
Applications
| Firmware Boot Storage | Industrial HMI Configuration |
|---|---|
|
Use Scenario: Stores bootloader and application firmware for ARM Cortex-M4 microcontrollers in factory automation controllers. IC Role / Device Role / Timing Role: Non-volatile code storage with XIP-capable read performance; provides deterministic 50 MHz High-Speed Read access during cold start. Use Value: Enables zero-latency firmware execution from flash, reducing boot time by 35% versus parallel NOR alternatives while occupying <25% PCB area. |
Use Scenario: Holds display configuration profiles, calibration tables, and language assets for touch-based HMIs in packaging machinery. IC Role / Device Role / Timing Role: Parameter storage with sector-level erase capability - allows independent update of UI assets without disturbing core logic. Use Value: Supports over-the-air UI updates via 4-Kbyte sector erase, minimizing downtime during production line changeovers. |
| Medical Device Log Buffer | Smart Energy Meter Firmware |
|
Use Scenario: Records diagnostic logs and sensor history in Class II medical infusion pumps with regulatory data integrity requirements. IC Role / Device Role / Timing Role: Secure, endurance-optimized data logger; uses software write protection to prevent tampering with audit trail sectors. Use Value: Guarantees 100,000-cycle endurance and >100-year retention - satisfies IEC 62304 clause 5.5.3 for critical data archiving. |
Use Scenario: Hosts metrology firmware and tariff tables in ANSI C12.20-compliant smart electricity meters deployed in utility substations. IC Role / Device Role / Timing Role: Field-upgradable firmware storage with 64-Kbyte block erase - enables full firmware replacement during AMI network rollouts. Use Value: Reduces field service visits by 92% through remote firmware updates verified via STATUS register BP3–BP0 lock-down after deployment. |
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–1.95V/2.7V–3.6V dual supply, 104 MHz max clock, Quad SPI support | Supports QPI mode and faster random read; lacks HOLD# pin and AAI programming | Select for higher-speed read-intensive applications requiring quad I/O; avoid if legacy SPI-only host or AAI-based programming flow is used. |
| ON Semiconductor LE25U40CM | 4-Mbit density, 2.3V–3.6V supply, 75 MHz max clock, standard SPI only, no AAI | Lower minimum voltage enables battery-powered operation; no hardware RY/BY# reconfiguration on SO | Prefer for ultra-low-voltage designs where 2.3V operation is mandatory; not suitable for systems relying on SO-based busy detection during AAI. |
Compared with SST25VF040B-50-4C-QAF, W25Q40EW offers higher bandwidth but sacrifices AAI efficiency and HOLD# suspend functionality, while LE25U40CM trades clock speed and RY/BY# flexibility for wider voltage tolerance - making SST25VF040B-50-4C-QAF optimal for cost-sensitive, SPI-only industrial controllers needing deterministic programming latency and robust suspend capability.
Availability
SST25VF040B-50-4C-QAF is available at Aetrix Electronics and suitable for industrial HMI firmware storage, medical device log buffering, and smart energy meter firmware hosting requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for SST25VF040B-50-4C-QAF 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 for embedded control applications.
The SST25VF040B-50-4C-QAF belongs to Microchip's 25-series Serial Flash family, engineered for low-pin-count, high-reliability firmware and parameter storage in cost-sensitive industrial and consumer electronics.
FAQ
What is the maximum clock frequency supported by the SST25VF040B-50-4C-QAF?
The SST25VF040B-50-4C-QAF supports up to 50 MHz for High-Speed Read operations using the 0BH opcode with a dummy cycle. Standard Read (03H) is rated to 25 MHz. This 50 MHz capability enables faster firmware fetch in microcontroller boot sequences and reduces overall system startup time compared to lower-frequency serial Flash alternatives.
Does the SST25VF040B-50-4C-QAF support SPI Mode 0 and Mode 3 simultaneously?
Yes, the SST25VF040B-50-4C-QAF natively supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) without hardware modification. The device detects the idle state of SCK and adapts sampling edges accordingly - allowing seamless integration with diverse host processors including legacy 8-bit MCUs and modern ARM-based SoCs.
How does Auto Address Increment (AAI) programming improve efficiency in the SST25VF040B-50-4C-QAF?
AAI programming in the SST25VF040B-50-4C-QAF eliminates the need to resend the address for each subsequent word write. After initial ADH command and address, consecutive 2-byte payloads are automatically written to incrementing addresses - reducing total programming time by up to 40% versus standard Byte Program mode in full-array firmware updates.
What write protection mechanisms are implemented in the SST25VF040B-50-4C-QAF?
The SST25VF040B-50-4C-QAF implements three-tiered write protection: hardware-level via WP# pin (enabling BPL lock-down), software-level via BP0–BP3 bits in the STATUS register (defining 7 protection zones), and instruction-level via WREN requirement before any write command. This layered approach prevents accidental erasure during field firmware updates and meets IEC 62304 data integrity requirements.
Is the SST25VF040B-50-4C-QAF pin-compatible with other 8-pin WSON Flash devices?
No, the SST25VF040B-50-4C-QAF uses a proprietary 8-contact WSON (6 mm × 5 mm) footprint with specific pin assignments (e.g., HOLD# on pin 6, WP# on pin 3). While physical dimensions match JEDEC MO-252, signal mapping differs from Winbond or Macronix equivalents - requiring PCB layout verification before substitution.
SST25VF040B-50-4C-QAF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-WDFN Exposed Pad
- 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-WSON (6x5)
SST25VF040B-50-4C-QAF FAQ
1.How can I place an order for SST25VF040B-50-4C-QAF through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25VF040B-50-4C-QAF 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 reliable?
The price and inventory of SST25VF040B-50-4C-QAF 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 is usually 5 days.
3.What payment methods are accepted for SST25VF040B-50-4C-QAF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25VF040B-50-4C-QAF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25VF040B-50-4C-QAF?
SST25VF040B-50-4C-QAF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25VF040B-50-4C-QAF 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?
For technical support, including SST25VF040B-50-4C-QAF 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 requirements.
6.How does Aetrix verify that SST25VF040B-50-4C-QAF is sourced from the original manufacturer or authorized distributors?
All SST25VF040B-50-4C-QAF 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 meets industry standards.
7.What is the process for return or replacement of SST25VF040B-50-4C-QAF?
All SST25VF040B-50-4C-QAF units undergo pre-shipment inspection (PSI). If there is an issue with SST25VF040B-50-4C-QAF, 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 part is unused and in its original packaging.
Return procedure for SST25VF040B-50-4C-QAF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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