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Microchip Technology SST25VF040B-50-4I-SAF-T
- Part No.:
- SST25VF040B-50-4I-SAF-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SST25VF040B-50-4I-SAF-T.pdf
- Description:
- IC FLASH 4MBIT SPI 50MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,695
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Product details
Overview
SST25VF040B-50-4I-SAF-T from Microchip Technology is a 4-Mbit SPI serial Flash memory IC designed for embedded code storage and data logging in microcontroller-based 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 firmware storage in industrial control units and IoT edge nodes.
For engineers reviewing the SST25VF040B-50-4I-SAF-T datasheet, SST25VF040B-50-4I-SAF-T pinout, SST25VF040B-50-4I-SAF-T application, or SST25VF040B-50-4I-SAF-T 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 protection, and industrial temperature range (-40°C to +85°C).
Technical Context
The SST25VF040B-50-4I-SAF-T implements a four-wire SPI interface with dual-mode support (Mode 0 and Mode 3), using CE#, SCK, SI, and SO signals for command/address/data transfer. Its SuperFlash® technology employs split-gate cells and thick-oxide tunneling injectors to achieve superior endurance and retention versus conventional NOR Flash.
Internal architecture includes dedicated I/O buffers, X/Y decoders, address latches, and control logic managing byte program, sector/block/chip erase, and STATUS register access. End-of-write detection is supported via software polling of the BUSY bit or hardware RY/BY# status output on SO during AAI mode.
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 |
| Supply Voltage | 2.7V–3.6V - enables direct integration with 3.3V microcontrollers without level-shifting |
| Max Clock Frequency | 50 MHz - supports high-speed High-Speed Read (0BH) for fast boot code fetch |
| Endurance | 100,000 program/erase cycles - sufficient for firmware update logging in field-deployed devices |
| Data Retention | Greater than 100 years - ensures long-term reliability in unattended applications |
| Erase Times | Sector/Block Erase: 18 ms typical; Chip Erase: 35 ms typical - reduces firmware update latency |
| Power Consumption | Active Read: 10 mA typical; Standby: 5 µA typical - suitable for battery-backed or low-power sensor nodes |
Pinout & Package
Package: 8-contact WSON (6 mm × 5 mm), RoHS-compliant, industrial-grade (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command sequence to prevent premature termination |
| SO | Serial Data Output | Outputs read data on SCK falling edge; reconfigurable as RY/BY# status indicator during AAI programming |
| 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 | Single 2.7V–3.6V supply input; bypass capacitor recommended near pin for noise immunity |
| HOLD# | Hold | Suspends ongoing SPI transaction without deselecting device; preserves internal state during host interrupt handling |
| SCK | Serial Clock | Provides timing reference; data sampled on rising edge (SI), output shifted on falling edge (SO) |
| SI | Serial Data Input | Accepts opcodes, addresses, and write data; MSb-first protocol aligned with SPI standard |
Key Features
| Feature | Design Value |
|---|---|
| Auto Address Increment (AAI) Programming | Reduces total programming time by eliminating repeated address transmission for sequential word writes |
| Flexible Erase Granularity | Supports 4-Kbyte sectors, 32-Kbyte blocks, and 64-Kbyte blocks - enables precise firmware partitioning and OTA update management |
| Dual SPI Mode Support | Compatible with both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) - simplifies integration across diverse MCU platforms |
| Hardware Write Protection | HOLD# and WP# pins provide real-time transaction suspension and irreversible block lock-down capability |
| End-of-Write Detection Options | Software polling (BUSY bit) or hardware RY/BY# output on SO - allows deterministic timing control in time-critical systems |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Non-volatile code storage with fast read access and robust erase/write cycling under thermal stress. Use Value: 100,000-cycle endurance and >100-year data retention ensure multi-decade field operation without refresh. | Use Scenario: Holding certified boot loader and safety-critical application code in portable diagnostic equipment requiring regulatory compliance. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage with hardware-enabled write protection (WP#/STATUS lock-down). Use Value: Block protection bits (BP3–BP0) and BPL lock-down prevent unauthorized firmware modification during service or calibration. |
| IoT Edge Node Configuration | Automotive Telematics Logging |
Use Scenario: Persisting network credentials, sensor calibration offsets, and OTA update staging data in battery-powered wireless sensors. IC Role / Device Role / Timing Role: Low-power non-volatile memory supporting frequent small-data updates with minimal energy per write. Use Value: 5 µA standby current and 7 µs byte program time extend battery life while enabling responsive configuration changes. | Use Scenario: Recording vehicle event data (e.g., crash logs, CAN bus snapshots) in telematics control units with strict write durability requirements. IC Role / Device Role / Timing Role: High-reliability data logger with fast sector erase (18 ms) to reuse memory space after critical event capture. Use Value: Uniform 4-Kbyte sector erase enables efficient overwrite of oldest log entries without disturbing active firmware partitions. |
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 SPI Flash; 85 MHz max clock; 100,000 cycles; 2.7V–3.6V; same 8-WSON package | Higher speed read but no AAI programming; different STATUS register layout and protection scheme | Preferred when maximum read throughput is prioritized over programming efficiency in update-heavy deployments |
| MX25L4005AM1I-12G | 4-Mbit SPI Flash; 50 MHz max clock; 100,000 cycles; 2.7V–3.6V; 8-SOIC (150-mil) and 8-WSON packages | Identical erase granularity and voltage range; lacks HOLD# pin; uses different instruction set for block protection | Valid alternative where board layout accommodates SOIC or where HOLD# functionality is unused in system design |
Compared with AT25DF041A-SSH-T and MX25L4005AM1I-12G, the SST25VF040B-50-4I-SAF-T uniquely combines AAI programming acceleration, HOLD# transaction suspension, and BPL-enabled irreversible block lock-down - making it optimal for resource-constrained, update-intense industrial firmware storage where deterministic timing and security are critical.
Availability
SST25VF040B-50-4I-SAF-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot code, and IoT edge node configuration requiring stable component supply across extended product lifecycles.
Supply support for SST25VF040B-50-4I-SAF-T 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 microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The SST25VF040B-50-4I-SAF-T belongs to Microchip's 25-series Serial Flash family, engineered specifically for cost-sensitive, space-constrained embedded systems needing reliable, low-pin-count non-volatile storage with industrial-grade temperature tolerance and enhanced power efficiency.
FAQ
What is the maximum SPI clock frequency supported by the SST25VF040B-50-4I-SAF-T?
The SST25VF040B-50-4I-SAF-T supports up to 50 MHz for High-Speed Read operations using the 0BH opcode. Standard Read (03H) is rated to 25 MHz. This dual-speed capability allows system designers to optimize between boot-time performance and signal integrity margins on the SPI bus. The 50 MHz rating applies only to High-Speed Read and requires proper PCB layout and termination to maintain timing compliance.
Does the SST25VF040B-50-4I-SAF-T support both SPI Mode 0 and Mode 3?
Yes, the SST25VF040B-50-4I-SAF-T explicitly supports both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), as confirmed in Section 4.0 of its datasheet. This dual-mode compatibility eliminates the need for external level shifters or protocol translation when interfacing with diverse microcontrollers - including legacy and newer ARM Cortex-M families that may default to either mode.
How does the HOLD# pin function during an active SPI transaction on the SST25VF040B-50-4I-SAF-T?
The HOLD# pin on the SST25VF040B-50-4I-SAF-T suspends an ongoing SPI sequence without resetting internal state or requiring CE# deassertion. When HOLD# is driven low while CE# is active, SO enters high-impedance and SI/SCK become don't-care, preserving address and command context. Communication resumes upon HOLD# going high, enabling seamless host interrupt handling - a critical feature for real-time systems managing concurrent peripherals.
What erase options are available on the SST25VF040B-50-4I-SAF-T, and how do they differ in use case?
The SST25VF040B-50-4I-SAF-T offers three erase granularities: 4-Kbyte sectors (20H), 32-Kbyte blocks (52H), and 64-Kbyte blocks (D8H). Sector erase suits fine-grained parameter updates; block erase optimizes firmware patching; chip erase (60H/C7H) resets the entire array. All require prior WREN execution and respect software/hardware write protection settings - ensuring safe, selective memory management in field-upgradable systems.
Can the SST25VF040B-50-4I-SAF-T be used in industrial temperature environments?
Yes, the SST25VF040B-50-4I-SAF-T is specified for industrial temperature operation from –40°C to +85°C, as indicated by the "I" suffix in its part number. This rating is validated across all electrical parameters including read/write timing, endurance, and data retention. Its SuperFlash® technology ensures stable performance across this range without derating - making it suitable for deployment in factory automation, outdoor infrastructure, and transportation electronics.
SST25VF040B-50-4I-SAF-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SAF-T FAQ
1.How can I place an order for SST25VF040B-50-4I-SAF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25VF040B-50-4I-SAF-T 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-SAF-T reliable?
The price and inventory of SST25VF040B-50-4I-SAF-T 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-SAF-T is usually 5 days.
3.What payment methods are accepted for SST25VF040B-50-4I-SAF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25VF040B-50-4I-SAF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25VF040B-50-4I-SAF-T?
SST25VF040B-50-4I-SAF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25VF040B-50-4I-SAF-T 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-SAF-T?
For technical support, including SST25VF040B-50-4I-SAF-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25VF040B-50-4I-SAF-T requirements.
6.How does Aetrix verify that SST25VF040B-50-4I-SAF-T is sourced from the original manufacturer or authorized distributors?
All SST25VF040B-50-4I-SAF-T 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-SAF-T meets industry standards.
7.What is the process for return or replacement of SST25VF040B-50-4I-SAF-T?
All SST25VF040B-50-4I-SAF-T units undergo pre-shipment inspection (PSI). If there is an issue with SST25VF040B-50-4I-SAF-T, 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-SAF-T part is unused and in its original packaging.
Return procedure for SST25VF040B-50-4I-SAF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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