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Microchip Technology SST25VF040B-50-4I-QAE
- Part No.:
- SST25VF040B-50-4I-QAE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
SST25VF040B-50-4I-QAE.pdf
- Description:
- IC FLASH 4MBIT SPI 50MHZ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,353
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Product details
Overview
SST25VF040B-50-4I-QAE from Microchip Technology is a 4-Mbit SPI serial Flash memory IC designed for embedded firmware storage, boot code retention, and configuration data in space-constrained systems. It operates from a single 2.7V–3.6V supply, supports up to 50 MHz clock frequency, delivers 100,000 program/erase cycles, and guarantees >100 years of data retention - deployed in industrial controllers, IoT edge nodes, and medical diagnostics equipment.
For engineers reviewing the SST25VF040B-50-4I-QAE datasheet, SST25VF040B-50-4I-QAE pinout, SST25VF040B-50-4I-QAE application, or SST25VF040B-50-4I-QAE equivalent, key selection considerations include its dual SPI mode (0/3) compatibility, hardware/software write protection architecture, AAI programming efficiency, and industrial temperature range (-40°C to +85°C) with RoHS-compliant 8-contact WSON (6 mm × 5 mm) packaging.
Technical Context
The SST25VF040B-50-4I-QAE implements a four-wire SPI interface with CE#, SCK, SI, and SO lines, supporting both Mode 0 (SCK idle low) and Mode 3 (SCK idle high). Its SuperFlash® split-gate cell technology enables faster erase times (18 ms sector/35 ms chip) and lower active current (10 mA typical) versus conventional NOR Flash.
It integrates a software-configurable STATUS register with BUSY/WEL/AAI/BP/BPL bits, enabling precise control over write enable state, auto address increment mode, and block-level protection (BP3–BP0) - all managed via standard SPI opcodes including WRSR (01H), RDSR (05H), and EWSR (50H).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512 Kbytes), organized as uniform 4-Kbyte sectors, 32-Kbyte and 64-Kbyte overlay blocks |
| Supply Voltage | 2.7V–3.6V - single-rail operation eliminates need for auxiliary voltage regulators in 3.3V systems |
| Max Clock Frequency | 50 MHz - enables high-speed read throughput using High-Speed Read (0BH) instruction with dummy cycle |
| Endurance | 100,000 program/erase cycles - sufficient for field firmware updates and logging in industrial gateways |
| Data Retention | >100 years at +25°C - ensures long-term reliability without refresh in battery-backed or offline applications |
| Operating Temp | -40°C to +85°C - qualified for industrial-grade deployment in motor drives, PLCs, and outdoor sensor hubs |
| Active Read Current | 10 mA typical at 50 MHz - reduces thermal load and power budget impact in always-on edge devices |
| Standby Current | 5 µA typical - supports ultra-low-power sleep modes in portable and energy-harvested systems |
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; high-to-low transition initiates instruction latch |
| SO | Serial Data Output | Outputs data on falling SCK edge; reconfigurable as RY/BY# status indicator during AAI programming when EBSY (70H) issued |
| WP# | Write-Protect Input | Enables BPL bit lockdown; when low, restricts WRSR execution unless BPL = 0 per Table 4-1 |
| VSS | Ground | Reference return path for all digital and analog circuitry; requires low-impedance PCB connection |
| VDD | Power Supply | 2.7V–3.6V input; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin per layout guidelines |
| HOLD# | Hold Control | Suspends ongoing SPI transaction without deselecting device; enters high-impedance SO state while preserving internal address pointer |
| SCK | Serial Clock | Timing reference for SI/SO; rising edge latches input, falling edge outputs data; supports Mode 0/3 polarity |
| SI | Serial Data Input | Accepts opcodes, addresses, and data MSb-first; sampled on rising SCK edge; must be stable before clock transition |
Key Features
| Feature | Design Value |
|---|---|
| Auto Address Increment (AAI) Programming | Reduces multi-byte programming time by eliminating repeated address transmission - two bytes programmed per ADH command |
| Dual SPI Mode Support (Mode 0 & Mode 3) | Ensures interoperability with diverse host controllers (e.g., ARM Cortex-M, Renesas RX, NXP i.MX) without hardware modification |
| Flexible Block Protection Scheme | Eight software-selectable protection levels (via BP3–BP0) allow granular lockdown of boot sectors, parameter banks, or calibration tables |
| Hardware End-of-Write Detection | EBSY (70H) configures SO pin as real-time RY/BY# signal - removes polling overhead and improves deterministic timing in safety-critical firmware updates |
| Uniform Erase Architecture | Consistent 4-Kbyte sector / 32-Kbyte block / 64-Kbyte block erase granularity simplifies partitioning and wear leveling in custom FTL implementations |
| SuperFlash® Technology | Split-gate cell design achieves lower program current and shorter erase time vs. standard NOR Flash - reducing total energy per operation |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
|
Use Scenario: Storing boot loader, application firmware, and field-upgradable logic in programmable logic controllers operating in factory-floor environments with wide temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Non-volatile code storage with fast read access (50 MHz High-Speed Read) and robust write endurance for periodic firmware patches. Use Value: Industrial temperature rating (-40°C to +85°C) and >100-year data retention ensure reliable operation across 15+ year product lifecycles without recalibration or replacement. |
Use Scenario: Holding calibrated sensor offsets, user preferences, and regulatory-compliant audit logs in portable ultrasound and infusion pump systems requiring traceable, tamper-resistant memory. IC Role / Device Role / Timing Role: Secure configuration storage with hardware/software write protection (WP#, BPL, BP3–BP0) preventing accidental or malicious overwrite of critical parameters. Use Value: Block-level protection enables independent lockdown of calibration data (upper 1/16) while allowing runtime updates to user settings (lower 15/16) - meeting IEC 62304 Class C requirements. |
| IoT Edge Node Boot Memory | Automotive Body Control Module (BCM) Parameter Storage |
|
Use Scenario: Hosting secure boot images and encrypted OTA update payloads in battery-powered smart meters and environmental sensors deployed in remote locations. IC Role / Device Role / Timing Role: Low-power non-volatile memory supporting deep-sleep modes (5 µA standby) and rapid wake-and-read sequences for event-triggered telemetry. Use Value: Ultra-low standby current extends battery life beyond 10 years in sealed deployments; AAI programming accelerates field update delivery under constrained bandwidth. |
Use Scenario: Storing vehicle-specific configuration maps (e.g., door lock timing, lighting profiles, seat position presets) in body control modules subject to automotive qualification standards. IC Role / Device Role / Timing Role: Automotive-grade parameter storage with proven reliability (100K cycles, >100 yr retention) and SPI interface compatibility with common MCU families (e.g., Infineon AURIX, ST STM32G4). Use Value: RoHS compliance and industrial temp range meet AEC-Q100 stress test prerequisites; HOLD# pin enables safe interruption of SPI traffic during CAN bus arbitration events. |
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, 1.65V–1.95V/2.7V–3.6V dual supply | Supports QPI/DTR modes for higher bandwidth; lacks HOLD# pin and hardware RY/BY# on SO | Select when system requires faster read throughput or quad interface flexibility; verify host controller SPI mode compatibility and voltage rail availability. |
| Cypress S25FL004A | 4 Mbit density, 50 MHz max clock, legacy SPI only, 2.7V–3.6V supply, no AAI mode | Identical pinout and basic command set but omits Auto Address Increment and EBSY/DBSY functionality | Choose for drop-in replacement where AAI acceleration and hardware busy signaling are not required; confirm STATUS register bit mapping matches. |
Compared with SST25VF040B-50-4I-QAE, W25Q40EW offers higher speed and quad capability at the cost of added complexity and missing HOLD#/RY-BY# integration, while S25FL004A provides functional equivalence for basic SPI Flash use cases but sacrifices AAI efficiency and real-time status feedback - making SST25VF040B-50-4I-QAE optimal for deterministic, low-overhead firmware storage in resource-constrained industrial designs.
Availability
SST25VF040B-50-4I-QAE is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and IoT edge node applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SST25VF040B-50-4I-QAE 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, Flash memory, and security solutions - serving industrial, automotive, communications, and consumer markets since 1989.
The SST25VF040B-50-4I-QAE belongs to Microchip's 25-series Serial Flash family, engineered specifically for cost-sensitive, space-constrained embedded systems needing reliable, low-power, SPI-compatible non-volatile storage with industrial-grade endurance and retention.
FAQ
What is the maximum clock frequency supported by the SST25VF040B-50-4I-QAE?
The SST25VF040B-50-4I-QAE 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 loading and configuration retrieval in time-critical embedded applications without requiring parallel memory interfaces.
Does the SST25VF040B-50-4I-QAE support both SPI Mode 0 and Mode 3?
Yes, the SST25VF040B-50-4I-QAE 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 seamless integration with a broad range of microcontrollers - including those with fixed SPI polarity settings - without requiring level-shifting or protocol translation.
How does the HOLD# pin function on the SST25VF040B-50-4I-QAE?
The HOLD# pin on the SST25VF040B-50-4I-QAE suspends an active SPI transaction without deselecting the device or resetting internal state. When asserted low during CE# active, it places SO in high-impedance while preserving the address pointer and command context - enabling priority interrupt handling in multitasking systems. Resuming requires deasserting HOLD# while CE# remains low.
What write protection mechanisms are implemented in the SST25VF040B-50-4I-QAE?
The SST25VF040B-50-4I-QAE implements three-tiered write protection: (1) hardware WP# pin enabling BPL lockdown, (2) software-configurable BP3–BP0 bits defining eight memory protection levels, and (3) STATUS register write-enable latching (WEL bit). These layers allow selective protection of boot sectors, calibration data, or user parameters - critical for functional safety and regulatory compliance.
What is the purpose of the Auto Address Increment (AAI) feature in the SST25VF040B-50-4I-QAE?
The Auto Address Increment (AAI) feature in the SST25VF040B-50-4I-QAE allows sequential word programming without retransmitting the address for each 2-byte payload - initiated via ADH opcode. This cuts total programming time by ~40% compared to standard byte programming, especially beneficial for firmware updates and bulk configuration writes in resource-limited embedded systems.
SST25VF040B-50-4I-QAE 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (6x5)
SST25VF040B-50-4I-QAE FAQ
1.How can I place an order for SST25VF040B-50-4I-QAE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25VF040B-50-4I-QAE 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-QAE reliable?
The price and inventory of SST25VF040B-50-4I-QAE 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-QAE is usually 5 days.
3.What payment methods are accepted for SST25VF040B-50-4I-QAE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25VF040B-50-4I-QAE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25VF040B-50-4I-QAE?
SST25VF040B-50-4I-QAE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25VF040B-50-4I-QAE 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-QAE?
For technical support, including SST25VF040B-50-4I-QAE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25VF040B-50-4I-QAE requirements.
6.How does Aetrix verify that SST25VF040B-50-4I-QAE is sourced from the original manufacturer or authorized distributors?
All SST25VF040B-50-4I-QAE 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-QAE meets industry standards.
7.What is the process for return or replacement of SST25VF040B-50-4I-QAE?
All SST25VF040B-50-4I-QAE units undergo pre-shipment inspection (PSI). If there is an issue with SST25VF040B-50-4I-QAE, 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-QAE part is unused and in its original packaging.
Return procedure for SST25VF040B-50-4I-QAE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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