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Microchip Technology SST25VF040B-50-4I-S2AF
- Part No.:
- SST25VF040B-50-4I-S2AF
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SST25VF040B-50-4I-S2AF.pdf
- Description:
- IC FLASH 4MBIT SPI 50MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:536
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Product details
Overview
SST25VF040B-50-4I-S2AF from Microchip Technology is a 4-Mbit SPI serial Flash memory IC with SuperFlash® technology, supporting 2.7V–3.6V single-supply operation, 50 MHz high-speed read (via 0BH command), and flexible erase architecture including uniform 4-Kbyte sectors and 32/64-Kbyte overlay blocks. It serves as nonvolatile program/data storage in microcontroller boot loaders, firmware update buffers, and embedded configuration memory.
For engineers reviewing the SST25VF040B-50-4I-S2AF datasheet, SST25VF040B-50-4I-S2AF pinout, SST25VF040B-50-4I-S2AF application, or SST25VF040B-50-4I-S2AF equivalent, key selection criteria include SPI Mode 0/3 compatibility, industrial temperature range (–40°C to +85°C), hardware/software write protection via WP# and STATUS register, Auto Address Increment (AAI) programming for reduced total programming time, and RoHS-compliant 8-contact WSON (6 mm × 5 mm) packaging.
Technical Context
The SST25VF040B-50-4I-S2AF implements a four-wire SPI interface with CE#, SCK, SI, and SO lines, supporting both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) timing. Its internal control logic manages address decoding, status register access, and erase/program sequencing without external high-voltage support.
It integrates a software-configurable STATUS register with BUSY, WEL, BP0–BP3, AAI, and BPL bits, enabling precise block-level write protection and real-time operation monitoring. End-of-write detection is supported via software polling of the BUSY bit or hardware RY/BY# output on SO during AAI mode after EBSY (70H) command execution.
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 - enables direct interfacing with 3.3V logic systems without level shifting |
| Max Clock Frequency | 50 MHz - supports High-Speed Read (0BH) for faster firmware fetch and data streaming |
| Erase/Program Speed | Chip Erase: 35 ms typ; Sector/Block Erase: 18 ms typ; Byte Program: 7 µs typ - reduces system update latency |
| Endurance & Retention | 100,000 program/erase cycles typ; >100 years data retention - suitable for field-upgradable embedded devices |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade applications including motor control and IoT edge nodes |
| Power Consumption | Active Read: 10 mA typ; Standby: 5 µA typ - supports low-power sleep modes in battery-backed systems |
Pinout & Package
Package: 8-contact WSON (6 mm × 5 mm), lead-free and RoHS compliant.
| 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 indicator during AAI programming when enabled via EBSY (70H) |
| 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 supply input; decoupling capacitor (0.1 µF) required near pin for noise suppression |
| HOLD# | Hold Control | Suspends ongoing SPI transaction without deselecting device; allows host to service higher-priority interrupts |
| SCK | Serial Clock | Provides timing reference; data latched on rising edge (SI), output shifted on falling edge (SO) |
| SI | Serial Data Input | Accepts commands, addresses, and data MSb-first; sampled on rising SCK edge |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Technology | Split-gate cell design with thick-oxide tunneling injector delivers superior endurance (100k cycles) and retention (>100 years) vs. conventional Flash |
| Auto Address Increment (AAI) | Reduces total programming time by eliminating repeated address transmission for sequential word writes |
| Dual End-of-Write Detection | Supports both software polling (BUSY bit) and hardware RY/BY# output on SO - eliminates CPU polling overhead in AAI mode |
| Flexible Block Protection | Four BP bits (BP0–BP3) enable software-selectable protection of upper 1/16 to full 4-Mbit array, configurable via WRSR (01H) instruction |
| Industrial Temperature Range | Rated –40°C to +85°C - validated for use in automotive body electronics, industrial HMIs, and outdoor sensor gateways |
Applications
| Boot Code Storage | Firmware Update Buffer |
|---|---|
Use Scenario: Stores primary bootloader and application firmware image for microcontrollers lacking internal Flash large enough for full code footprint. IC Role / Device Role / Timing Role: Nonvolatile storage accessed at power-on reset via SPI; supports fast High-Speed Read (50 MHz) to minimize boot latency. Use Value: Enables deterministic <100 ms cold-start time in industrial PLCs using external MCU with minimal internal Flash. | Use Scenario: Holds validated firmware patches prior to atomic swap into main application space during over-the-air (OTA) updates. IC Role / Device Role / Timing Role: Dual-bank capable buffer; leverages AAI programming to write patch data in <50 ms, minimizing system downtime. Use Value: Reduces field update window by 65% compared to byte-program-only alternatives, critical for medical device regulatory compliance. |
| Configuration Parameter Storage | Calibration Data Archive |
Use Scenario: Retains user-defined settings (network IDs, scaling factors, alarm thresholds) across power cycles in smart meters and HVAC controllers. IC Role / Device Role / Timing Role: Write-protected storage using BP bits; WP# pin hardwired to VDD to prevent accidental overwrite during runtime. Use Value: Guarantees parameter integrity over 10+ years of field operation without requiring battery backup or EEPROM emulation. | Use Scenario: Archives factory-calibrated sensor coefficients (e.g., thermistor lookup tables, ADC offset/gain) for precision measurement instruments. IC Role / Device Role / Timing Role: One-time programmable archive area; protected via BPL bit lockdown after calibration to prevent field tampering. Use Value: Eliminates need for external OTP memory, reducing BOM count and enabling traceable calibration chain per unit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 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, but uses different STATUS register layout and lacks AAI programming | Higher speed read but no AAI acceleration; requires more CPU cycles for bulk writes | Prefer when maximum read throughput is critical and firmware update frequency is low |
| W25Q40EWUXIE | 4-Mbit density, 133 MHz max clock, 1.65–1.95V/2.7–3.6V dual supply, Quad SPI support, but no HOLD# pin | Supports QSPI for 4x data rate, yet lacks hardware hold functionality needed in interrupt-driven systems | Choose when migrating to QSPI interface and system design can accommodate absence of HOLD# |
Compared with AT25DF041A-SSH-T and W25Q40EWUXIE, the SST25VF040B-50-4I-S2AF provides optimal balance of industrial temperature rating, AAI programming efficiency, and HOLD#-enabled transaction suspension-making it preferred for resource-constrained, interrupt-sensitive embedded controllers where update speed and robustness outweigh raw bandwidth needs.
Availability
SST25VF040B-50-4I-S2AF is available at Aetrix Electronics and suitable for industrial control panels, medical diagnostic peripherals, and automotive infotainment head units requiring stable component supply across extended product lifecycles.
Supply support for SST25VF040B-50-4I-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 manufacturing and support infrastructure.
The SST25VF040B-50-4I-S2AF belongs to Microchip's 25-series Serial Flash family, designed specifically for cost-sensitive, space-constrained embedded systems needing reliable nonvolatile storage with low pin count and industrial-grade reliability.
FAQ
What is the maximum operating clock frequency supported by the SST25VF040B-50-4I-S2AF?
The SST25VF040B-50-4I-S2AF supports up to 50 MHz for High-Speed Read operations using the 0BH command, while standard Read (03H) operates up to 25 MHz. This 50 MHz capability is explicitly specified in the DS20005051E datasheet and applies directly to the SST25VF040B-50-4I-S2AF variant. The '50' in the part number denotes this maximum clock rating, and the device maintains timing compliance across its full industrial temperature range (–40°C to +85°C).
Does the SST25VF040B-50-4I-S2AF support both SPI Mode 0 and Mode 3?
Yes, the SST25VF040B-50-4I-S2AF is fully compatible with both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as confirmed in Section 4.0 of the DS20005051E datasheet. This dual-mode support allows seamless integration with diverse host controllers-including legacy MCUs requiring Mode 0 and newer SoCs optimized for Mode 3-without hardware modification. The SST25VF040B-50-4I-S2AF automatically adapts to the master's clock polarity and phase configuration.
How does the HOLD# pin function in the SST25VF040B-50-4I-S2AF, and what is its timing requirement?
The HOLD# pin in the SST25VF040B-50-4I-S2AF suspends an active SPI transaction without deselecting the device or resetting internal state. To activate HOLD#, CE# must be low and HOLD# must fall coincident with SCK's low state; exit occurs on HOLD# rise coincident with SCK low. If edges misalign, the device enters/exits HOLD on the next SCK low. During HOLD#, SO goes high-Z while SI and SCK remain valid. This behavior is documented in Figure 4-2 and Section 4.1 of the SST25VF040B-50-4I-S2AF datasheet.
What write protection mechanisms are implemented in the SST25VF040B-50-4I-S2AF?
The SST25VF040B-50-4I-S2AF implements three-tiered write protection: (1) Hardware via WP# pin enabling BPL bit lock-down, (2) Software via BP0–BP3 bits in the STATUS register to protect memory regions (e.g., upper 1/2, full array), and (3) Command-level enforcement-Chip Erase only executes if all BP bits = 0. These mechanisms are defined in Tables 4-1 through 4-3 and Section 4.2 of the official datasheet, and apply identically to the SST25VF040B-50-4I-S2AF package variant.
Is the SST25VF040B-50-4I-S2AF pin-compatible with other packages in the SST25VF040B family?
Yes, the SST25VF040B-50-4I-S2AF uses the 8-contact WSON (6 mm × 5 mm) package with identical pinout and electrical characteristics as the 8-lead SOIC variants (208 mil and 150 mil). Pin assignments-CE#, SO, WP#, VSS, VDD, HOLD#, SCK, SI-are functionally and physically identical across all SST25VF040B packages, enabling drop-in replacement in PCB layouts designed for SOIC footprints using adapter carriers, or direct substitution in WSON-optimized designs. This compatibility is verified in Figure 2-1 and Table 2-1 of DS20005051E.
SST25VF040B-50-4I-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SST25VF040B-50-4I-S2AF FAQ
1.How can I place an order for SST25VF040B-50-4I-S2AF through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25VF040B-50-4I-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-50-4I-S2AF reliable?
The price and inventory of SST25VF040B-50-4I-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-50-4I-S2AF is usually 5 days.
3.What payment methods are accepted for SST25VF040B-50-4I-S2AF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25VF040B-50-4I-S2AF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25VF040B-50-4I-S2AF?
SST25VF040B-50-4I-S2AF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25VF040B-50-4I-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-50-4I-S2AF?
For technical support, including SST25VF040B-50-4I-S2AF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25VF040B-50-4I-S2AF requirements.
6.How does Aetrix verify that SST25VF040B-50-4I-S2AF is sourced from the original manufacturer or authorized distributors?
All SST25VF040B-50-4I-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-50-4I-S2AF meets industry standards.
7.What is the process for return or replacement of SST25VF040B-50-4I-S2AF?
All SST25VF040B-50-4I-S2AF units undergo pre-shipment inspection (PSI). If there is an issue with SST25VF040B-50-4I-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-50-4I-S2AF part is unused and in its original packaging.
Return procedure for SST25VF040B-50-4I-S2AF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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