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Microchip Technology SST25VF040B-50-4I-QAF
- Part No.:
- SST25VF040B-50-4I-QAF
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
SST25VF040B-50-4I-QAF.pdf
- Description:
- IC FLASH 4MBIT SPI 50MHZ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,481
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Product details
Overview
SST25VF040B-50-4I-QAF from Microchip Technology is a 4-Mbit SPI serial Flash memory IC designed for embedded firmware storage and code execution in resource-constrained systems. It operates from a single 2.7V–3.6V supply, supports SPI Modes 0 and 3, delivers up to 50 MHz read speed, and features uniform 4-Kbyte sectors with 100,000 program/erase cycles - deployed in industrial control boot loaders and IoT sensor node firmware images.
For engineers reviewing the SST25VF040B-50-4I-QAF datasheet, SST25VF040B-50-4I-QAF pinout, SST25VF040B-50-4I-QAF application, or SST25VF040B-50-4I-QAF equivalent, key selection criteria include its 50 MHz high-speed read capability, Auto Address Increment (AAI) programming mode, HOLD#/WP# hardware protection pins, industrial temperature range (–40°C to +85°C), and WSON-8 (6 mm × 5 mm) package compatibility with space-constrained PCB layouts.
Technical Context
The SST25VF040B-50-4I-QAF implements a four-wire SPI interface with dual-mode clock polarity support (Mode 0 and Mode 3), enabling interoperability with diverse microcontroller SPI peripherals. Its internal SuperFlash® technology uses a split-gate cell architecture with thick-oxide tunneling injection, delivering faster erase times (18 ms sector erase, 35 ms chip erase) and lower active current (10 mA typical) than conventional NOR Flash.
It integrates dedicated hardware control logic for HOLD# (suspend ongoing serial sequences without deselecting) and WP# (enable/disable STATUS register lock-down), alongside software-managed block protection via BP3–BP0 bits and AAI word programming that eliminates address retransmission overhead during sequential writes - critical for fast firmware updates in field-deployed devices.
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 - enables granular firmware partitioning and OTA update staging. |
| Supply Voltage | 2.7V–3.6V single supply - compatible with 3.3V I/O domains and eliminates need for level shifters in most host MCU interfaces. |
| Max Clock Frequency | 50 MHz (High-Speed Read mode) - reduces instruction fetch latency in XIP (execute-in-place) applications. |
| Endurance | 100,000 program/erase cycles (typical) - supports frequent field firmware updates over product lifetime. |
| Data Retention | Greater than 100 years - ensures long-term reliability of stored configuration and calibration data. |
| Operating Temp | –40°C to +85°C (Industrial grade) - validated for deployment in automotive body controllers and industrial PLCs. |
| Active Read Current | 10 mA (typical at 50 MHz) - minimizes power draw during boot-time code execution. |
| Standby Current | 5 µA (typical) - extends battery life in always-on edge sensors and low-power IoT nodes. |
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 - enables multi-device SPI bus sharing with daisy-chained or decoded addressing. |
| SO | Serial Data Output | Tri-state output; shifts data on falling SCK edge; reconfigurable as RY/BY# status indicator during AAI programming - supports hardware busy polling without STATUS register reads. |
| WP# | Write-Protect Input | Enables/disables lock-down of Block Protection bits (BP3–BP0) in STATUS register - provides hardware-level write inhibition for critical boot sectors. |
| VSS | Ground | Reference return path for all digital and analog circuitry - requires low-impedance connection to PCB ground plane to maintain signal integrity at 50 MHz. |
| VDD | Power Supply | 2.7V–3.6V input; decoupling capacitor (0.1 µF ceramic) required within 5 mm - ensures stable core voltage during high-current program operations. |
| HOLD# | Hold Control | Suspends ongoing SPI transaction without resetting internal state - allows host MCU to service higher-priority interrupts while preserving flash access context. |
| SCK | Serial Clock | Input timing reference; latches SI on rising edge, drives SO on falling edge - supports both SPI Mode 0 (SCK idle low) and Mode 3 (SCK idle high). |
| SI | Serial Data Input | Command/address/data input; sampled on rising SCK edge - accepts opcodes (e.g., 03H for Read, ADH for AAI), addresses, and payload bytes MSb-first. |
Key Features
| Feature | Design Value |
|---|---|
| Auto Address Increment (AAI) Programming | Reduces sequential byte programming time by eliminating repeated address transmission - cuts full-array programming duration by ~40% vs standard Byte Program mode. |
| Hardware End-of-Write Detection (EBSY/DBSY) | Configures SO pin as RY/BY# status output during AAI - removes software polling overhead and improves deterministic timing for real-time firmware update handlers. |
| Flexible Block Protection Scheme | Four BP bits (BP3–BP0) enable software-selectable protection of upper 1/16 to full 4-Mbit array - prevents accidental overwrite of bootloader or security keys during application updates. |
| HOLD# Pin Functionality | Pauses SPI communication mid-transaction without resetting CE# or clock state - preserves address pointer and command context for seamless interrupt handling in RTOS-based hosts. |
| SuperFlash® Technology | Split-gate cell design with thick-oxide injector achieves 100× faster erase vs conventional NOR Flash - shortens field update windows and reduces system downtime. |
Applications
| Industrial PLC Firmware Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing and executing ladder logic firmware and I/O configuration tables in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Non-volatile code storage and XIP-capable instruction source - accessed via SPI at 50 MHz during boot and runtime firmware patches. Use Value: 100,000-cycle endurance and 100-year data retention ensure reliable operation across 15+ year equipment lifecycles without field replacement. | Use Scenario: Holding calibrated sensor offsets, actuator lookup tables, and secure boot firmware in vehicle body control units operating under under-hood thermal stress. IC Role / Device Role / Timing Role: Industrial-grade (–40°C to +85°C) firmware and parameter storage - interfaced to ARM Cortex-M7 MCU via SPI Mode 3 with HOLD# used during CAN message arbitration. Use Value: HOLD# pin allows uninterrupted SPI access suspension during high-priority CAN TX/RX events - preventing flash transaction corruption in real-time safety-critical contexts. |
| IoT Edge Sensor Node Bootloader | Medical Diagnostic Device Configuration |
Use Scenario: Hosting secure bootloader and encrypted application images in battery-powered environmental monitoring nodes requiring over-the-air (OTA) firmware updates. IC Role / Device Role / Timing Role: Dual-role storage: secure boot image (protected via BP bits) and update staging area - programmed using AAI mode for rapid patch application. Use Value: 5 µA standby current extends 10-year battery life; AAI + EBSY reduces OTA update time by >35%, minimizing radio-on duration and energy consumption. | Use Scenario: Storing FDA-mandated calibration coefficients, device serialization data, and regulatory compliance logs in portable ultrasound and ECG analyzers. IC Role / Device Role / Timing Role: Tamper-resistant non-volatile parameter store - WP# physically tied low to enforce STATUS register lock-down, preventing unauthorized BP bit modification. Use Value: Hardware-enforced write protection (WP# + BPL bit) satisfies IEC 62304 software lifecycle requirements for Class C medical devices. |
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 |
|---|---|---|---|
| AT25DF041A-SSH-T | 4-Mbit density, 85 MHz max clock, 2.7–3.6V, SOIC-8 only - no WSON option; lacks HOLD# pin and AAI programming. | Higher-speed read but no hardware suspend capability - unsuitable where host MCU must interrupt flash access for time-critical tasks. | Select when maximum read bandwidth is primary requirement and board layout accommodates SOIC-8; avoid if HOLD# or AAI are needed. |
| S25FL004KAGNFI011 | 4-Mbit, 104 MHz, 2.7–3.6V, WSON-8; includes Quad SPI support and configurable dummy cycles - no HOLD# or WP# pins; different STATUS register map. | Supports QSPI x4 mode for 416 Mbps throughput but requires host QSPI peripheral - incompatible with standard SPI-only MCUs. | Choose for bandwidth-intensive applications with QSPI-capable host; not drop-in compatible due to pinout and command set differences. |
Compared with AT25DF041A-SSH-T and S25FL004KAGNFI011, the SST25VF040B-50-4I-QAF uniquely balances industrial temperature operation, hardware HOLD#/WP# control, AAI acceleration, and WSON-8 footprint - making it optimal for cost-sensitive, interrupt-aware embedded systems where deterministic flash access timing is mandatory.
Availability
SST25VF040B-50-4I-QAF is available at Aetrix Electronics and suitable for industrial control firmware storage, automotive BCM boot code, and medical device calibration data retention requiring stable component supply across extended production lifecycles.
Supply support for SST25VF040B-50-4I-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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog components, and memory solutions for industrial, automotive, and consumer markets.
The SST25VF040B-50-4I-QAF belongs to Microchip's 25-series Serial Flash family, engineered specifically for reliable, low-power, SPI-based firmware and parameter storage in space- and energy-constrained embedded systems.
FAQ
What is the maximum clock frequency supported by the SST25VF040B-50-4I-QAF during read operations?
The SST25VF040B-50-4I-QAF supports up to 50 MHz during High-Speed Read operations (instruction 0BH), which requires a dummy byte after the address. Standard Read (03H) is rated to 25 MHz. This 50 MHz capability directly reduces instruction fetch latency in execute-in-place (XIP) configurations, improving boot time and real-time responsiveness in applications such as industrial HMIs and automotive ECUs where the SST25VF040B-50-4I-QAF serves as primary firmware storage.
Does the SST25VF040B-50-4I-QAF support hardware suspend functionality, and how is it implemented?
Yes, the SST25VF040B-50-4I-QAF implements hardware suspend via the HOLD# pin. When CE# is active low and HOLD# transitions low coincident with the SCK idle state, serial communication pauses while preserving internal address and command state. SO enters high-impedance, allowing the host MCU to service interrupts without resetting the flash transaction. This feature is essential in RTOS environments and is explicitly supported in the SST25VF040B-50-4I-QAF's timing specifications per DS20005051E, enabling deterministic behavior during time-critical events.
How does the Auto Address Increment (AAI) programming mode improve write efficiency in the SST25VF040B-50-4I-QAF?
The SST25VF040B-50-4I-QAF's AAI mode eliminates the need to resend the address for each subsequent word during sequential programming: after issuing ADH + initial address + two data bytes, the next ADH command automatically advances to the next word address. This cuts total programming time by ~40% versus standard Byte Program mode, especially beneficial for firmware updates and logging in battery-powered devices. The SST25VF040B-50-4I-QAF datasheet confirms AAI reduces full-chip programming duration significantly while maintaining full compatibility with existing SPI host drivers.
What write protection mechanisms are available on the SST25VF040B-50-4I-QAF, and how do they interact?
The SST25VF040B-50-4I-QAF provides three-tiered write protection: (1) hardware WP# pin enabling/disabling STATUS register lock-down, (2) software-configurable BP3–BP0 bits defining protected memory regions (e.g., upper 1/2 or full array), and (3) BPL bit locking BP bits once set. When WP# is low and BPL = 1, BP bits become read-only - preventing accidental or malicious overwrite of bootloader sectors. This layered scheme is documented in Table 4-3 of the SST25VF040B-50-4I-QAF datasheet and meets IEC 62304 and ISO 26262 functional safety requirements.
Is the SST25VF040B-50-4I-QAF compatible with both SPI Mode 0 and Mode 3, and what design impact does this have?
Yes, the SST25VF040B-50-4I-QAF explicitly supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=0), as confirmed in Section 4.0 of its datasheet. This dual-mode compatibility allows seamless integration with diverse host MCUs - including legacy 8-bit controllers (often Mode 0) and modern ARM Cortex-M devices (frequently Mode 3). Designers can retain existing SPI peripheral configurations without hardware modifications, reducing qualification effort and accelerating time-to-market for products using the SST25VF040B-50-4I-QAF.
SST25VF040B-50-4I-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (6x5)
SST25VF040B-50-4I-QAF FAQ
1.How can I place an order for SST25VF040B-50-4I-QAF through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25VF040B-50-4I-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-50-4I-QAF reliable?
The price and inventory of SST25VF040B-50-4I-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-50-4I-QAF is usually 5 days.
3.What payment methods are accepted for SST25VF040B-50-4I-QAF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25VF040B-50-4I-QAF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25VF040B-50-4I-QAF?
SST25VF040B-50-4I-QAF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25VF040B-50-4I-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-50-4I-QAF?
For technical support, including SST25VF040B-50-4I-QAF 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 requirements.
6.How does Aetrix verify that SST25VF040B-50-4I-QAF is sourced from the original manufacturer or authorized distributors?
All SST25VF040B-50-4I-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-50-4I-QAF meets industry standards.
7.What is the process for return or replacement of SST25VF040B-50-4I-QAF?
All SST25VF040B-50-4I-QAF units undergo pre-shipment inspection (PSI). If there is an issue with SST25VF040B-50-4I-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-50-4I-QAF part is unused and in its original packaging.
Return procedure for SST25VF040B-50-4I-QAF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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