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Microchip Technology SST25VF040B-50-4C-S2AF
- Part No.:
- SST25VF040B-50-4C-S2AF
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SST25VF040B-50-4C-S2AF.pdf
- Description:
- IC FLASH 4MBIT SPI 50MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:480
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Product details
Overview
SST25VF040B-50-4C-S2AF 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 up to 50 MHz clock frequency, delivers 100,000 program/erase cycles, and retains data for >100 years - enabling reliable boot code and parameter storage in industrial controllers and IoT edge nodes.
For engineers reviewing the SST25VF040B-50-4C-S2AF datasheet, SST25VF040B-50-4C-S2AF pinout, SST25VF040B-50-4C-S2AF application, or SST25VF040B-50-4C-S2AF equivalent, key selection criteria include SPI Mode 0/3 compatibility, 4-Kbyte sector + 32/64-Kbyte block erase granularity, Auto Address Increment (AAI) programming efficiency, HOLD#/WP# hardware control, and commercial temperature grade (0°C to +70°C) in 8-lead SOIC (208 mil).
Technical Context
The SST25VF040B-50-4C-S2AF implements a four-wire SPI interface with dual-mode support (Mode 0 and Mode 3), using rising-edge sampling on SI and falling-edge output on SO. Its SuperFlash® split-gate CMOS technology enables fast, low-energy erase and program operations without requiring high-voltage assist circuits.
Internal architecture includes dedicated I/O buffers, X/Y decoders, address latches, and a status register with BUSY, WEL, BPx, AAI, and BPL bits - enabling precise software-controlled write protection, hardware suspend via HOLD#, and real-time operation monitoring via SO pin reconfiguration during AAI mode.
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-supply operation eliminates need for charge pumps or auxiliary rails |
| Max Clock Frequency | 50 MHz - enables high-speed read via High-Speed Read (0BH) instruction with dummy cycle |
| Endurance | 100,000 program/erase cycles - sufficient for frequent firmware updates in field-deployed devices |
| Data Retention | Greater than 100 years - ensures long-term reliability in unattended applications |
| Active Read Current | 10 mA (typical) at 50 MHz - balances speed and power in battery-backed or energy-sensitive designs |
| Standby Current | 5 µA (typical) - minimizes quiescent power during system sleep modes |
| Erase Times | Chip Erase: 35 ms (typ); Sector/Block Erase: 18 ms (typ) - reduces firmware update latency vs. legacy parallel Flash |
Pinout & Package
Package: 8-lead SOIC (208 mil), RoHS-compliant, commercial temperature grade (0°C to +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command sequence; high-to-low transition initiates operation |
| SO | Serial Data Output | Outputs data on falling SCK edge; reconfigurable as RY/BY# status pin during AAI programming when EBSY issued |
| WP# | Write-Protect | 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 input; bypassing with 0.1 µF ceramic capacitor near pin is mandatory for stable operation |
| HOLD# | Hold Control | Suspends ongoing SPI transaction without deselecting device; preserves internal state and clock alignment |
| SCK | Serial Clock | Timing reference; rising edge latches SI, falling edge outputs SO; supports Mode 0 (idle low) and Mode 3 (idle high) |
| 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 multi-byte programming time by eliminating repeated address transmission - critical for rapid firmware patching |
| Hardware End-of-Write Detection (EBSY/DBSY) | Configures SO pin as RY/BY# status indicator during AAI, removing software polling overhead and improving deterministic timing |
| Flexible Block Protection | Four BP bits + BPL enable granular, software-configurable protection of upper 1/16 to full array - prevents accidental overwrite of bootloader or calibration data |
| HOLD# Pin Functionality | Allows interruption of SPI sequences (e.g., during interrupt servicing) without resetting internal address counters or command state |
| SuperFlash® Technology | Split-gate cell design delivers lower program current and shorter erase time vs. conventional Flash - reducing total energy per operation |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing and executing boot firmware and runtime configuration parameters in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Non-volatile code storage and execution memory interfaced directly to ARM Cortex-M microcontroller via SPI bus. Use Value: 4-Kbyte sector erase enables incremental firmware updates without disrupting active control loops; 100-year retention ensures calibration data integrity over equipment lifetime. | Use Scenario: Holding device-specific calibration tables, user preferences, and regulatory audit logs in portable diagnostic instruments with strict data integrity requirements. IC Role / Device Role / Timing Role: Secure, write-protected parameter storage with hardware-enabled lockdown (WP# + BPL) to meet IEC 62304 traceability mandates. Use Value: Software block protection prevents unauthorized modification of safety-critical settings; 5 µA standby current extends battery life between recalibrations. |
| IoT Edge Node Bootloader | Automotive Infotainment UI Assets |
Use Scenario: Hosting secure bootloader and encrypted application images in battery-powered wireless sensor nodes operating in remote locations. IC Role / Device Role / Timing Role: Primary boot memory mapped via XIP-capable SPI controller; leverages High-Speed Read (0BH) for sub-100ms startup. Use Value: 50 MHz read capability and wrap-around addressing simplify firmware loading logic; AAI programming accelerates over-the-air (OTA) patch deployment. | Use Scenario: Caching graphical assets (icons, fonts, animations) and localized language strings in automotive head units where display responsiveness impacts driver experience. IC Role / Device Role / Timing Role: Secondary SPI Flash buffer accessed asynchronously by GPU or display controller to offload main SoC memory bandwidth. Use Value: Uniform 32/64-Kbyte block erase allows efficient asset versioning; HOLD# pin enables seamless UI rendering during concurrent firmware background tasks. |
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, 2.7V–3.6V supply, but uses different status register layout and lacks AAI programming | Higher-speed read suitable for graphics buffering; no AAI means longer firmware update times | Select when maximum read throughput is prioritized over programming efficiency and legacy code compatibility is not required |
| W25Q40EWUXIE | 4-Mbit density, 133 MHz Dual/Quad SPI capable, 1.65V–1.95V/2.7V–3.6V dual supply, includes Quad Enable bit and QPI mode | Supports faster interfaces and lower voltage operation; requires additional initialization and differs in protection bit mapping | Select for new designs targeting higher bandwidth or ultra-low-power operation; not drop-in compatible due to command set and voltage range differences |
Compared with AT25DF041A-SSH-T and W25Q40EWUXIE, the SST25VF040B-50-4C-S2AF offers proven AAI programming and HOLD#/WP# hardware control optimized for deterministic embedded boot workflows - making it preferable for cost-sensitive, SPI-only applications requiring field-upgradable firmware with minimal MCU overhead.
Availability
SST25VF040B-50-4C-S2AF is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, and IoT edge node bootloader applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for SST25VF040B-50-4C-S2AF 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 Inc. is a leading provider of microcontrollers, analog components, and Flash memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The SST25VF040B-50-4C-S2AF belongs to Microchip's 25-series Serial Flash family, engineered specifically for cost-effective, low-pin-count non-volatile storage in space-constrained embedded systems where SPI interface simplicity and SuperFlash® reliability are critical.
FAQ
What is the operating temperature range for the SST25VF040B-50-4C-S2AF?
The SST25VF040B-50-4C-S2AF is specified for commercial temperature operation from 0°C to +70°C. This grade is validated for use in office equipment, consumer electronics, and industrial control panels where ambient thermal conditions remain within this envelope. The 'C' in the part number explicitly denotes the commercial temperature grade, distinct from the industrial-grade variant SST25VF040B-50-4I-S2AF (-40°C to +85°C).
Does the SST25VF040B-50-4C-S2AF support both SPI Mode 0 and Mode 3?
Yes, the SST25VF040B-50-4C-S2AF fully supports both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1). In Mode 0, SCK idles low and data is sampled on the rising edge; in Mode 3, SCK idles high and data is still sampled on the rising edge. This dual-mode compatibility allows direct integration with diverse host microcontrollers without level-shifting or protocol translation.
How does the HOLD# pin function during an active SPI transaction in the SST25VF040B-50-4C-S2AF?
The HOLD# pin in the SST25VF040B-50-4C-S2AF suspends an ongoing SPI sequence while maintaining CE# active-low and preserving internal address and command state. When HOLD# transitions low coincident with SCK's inactive state, SO enters high-impedance and SI/SCK become don't-care - allowing the host to service interrupts or perform other tasks. Communication resumes upon HOLD# going high, with no loss of synchronization or need to reissue commands.
What erase granularities are supported by the SST25VF040B-50-4C-S2AF?
The SST25VF040B-50-4C-S2AF supports three distinct erase granularities: uniform 4-Kbyte sectors, 32-Kbyte overlay blocks, and 64-Kbyte overlay blocks. Sector erase uses command 20H with A12 as MSB; 32-Kbyte block erase uses 52H with A15 as MSB; 64-Kbyte block erase uses D8H with A16 as MSB. All erase operations require prior WREN and are ignored if the target region is software-protected via BP bits.
Can the SST25VF040B-50-4C-S2AF be used for XIP (eXecute-In-Place) applications?
The SST25VF040B-50-4C-S2AF supports XIP operation when interfaced with a host controller that implements SPI memory-mapped read acceleration (e.g., via cache or prefetch buffers). Its High-Speed Read (0BH) instruction enables 50 MHz continuous reads with dummy-cycle timing, and wrap-around addressing simplifies linear code execution across sector boundaries - though true zero-wait-state XIP requires external hardware support beyond the SST25VF040B-50-4C-S2AF itself.
SST25VF040B-50-4C-S2AF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-SOIC (0.209", 5.30mm 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-S2AF FAQ
1.How can I place an order for SST25VF040B-50-4C-S2AF through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25VF040B-50-4C-S2AF 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-S2AF reliable?
The price and inventory of SST25VF040B-50-4C-S2AF 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-S2AF is usually 5 days.
3.What payment methods are accepted for SST25VF040B-50-4C-S2AF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25VF040B-50-4C-S2AF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25VF040B-50-4C-S2AF?
SST25VF040B-50-4C-S2AF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25VF040B-50-4C-S2AF 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-S2AF?
For technical support, including SST25VF040B-50-4C-S2AF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25VF040B-50-4C-S2AF requirements.
6.How does Aetrix verify that SST25VF040B-50-4C-S2AF is sourced from the original manufacturer or authorized distributors?
All SST25VF040B-50-4C-S2AF 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-S2AF meets industry standards.
7.What is the process for return or replacement of SST25VF040B-50-4C-S2AF?
All SST25VF040B-50-4C-S2AF units undergo pre-shipment inspection (PSI). If there is an issue with SST25VF040B-50-4C-S2AF, 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-S2AF part is unused and in its original packaging.
Return procedure for SST25VF040B-50-4C-S2AF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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