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Microchip Technology SST25WF040BT-40I/SN
- Part No.:
- SST25WF040BT-40I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SST25WF040BT-40I/SN.pdf
- Description:
- IC FLASH 4MBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,917
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Product details
Overview
SST25WF040BT-40I/SN from Microchip Technology is a 4 Mbit (512 KByte), 1.65–1.95V SPI serial flash memory IC with dual I/O support, 40 MHz high-speed read capability, and SuperFlash technology enabling fast erase/program cycles and ultra-low power consumption. It operates across the industrial temperature range (−40°C to +85°C) and is used for firmware storage in space-constrained embedded controllers and IoT edge nodes.
For engineers reviewing the SST25WF040BT-40I/SN datasheet, SST25WF040BT-40I/SN pinout, SST25WF040BT-40I/SN application, or SST25WF040BT-40I/SN equivalent, key selection considerations include its 1.8V single-supply operation, dual-output/fast-read dual I/O command support (3BH/BBH), 4 KByte sector and 64 KByte block erase granularity, 256-byte page programming, and hardware write protection via WP# and HOLD# pins.
Technical Context
The SST25WF040BT-40I/SN implements a four-wire SPI interface compatible with Mode 0 and Mode 3 clock polarity/phasing, supporting standard Read (03H), High-Speed Read (0BH), Fast-Read Dual-Output (3BH), and Fast-Read Dual I/O (BBH) instructions. Its SuperFlash split-gate cell architecture enables reliable 100,000 program/erase cycles and >20-year data retention at 85°C.
Internal control logic manages status register bits (BUSY, WEL, BP0–BP2, TB, BPL) to coordinate write-enable sequencing, software block protection, and end-of-write detection via polling. The device supports flexible erase hierarchy-sector (4 KByte), block (64 KByte), and chip-wide-with typical times of 40 ms, 80 ms, and 400 ms respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512 KByte); sufficient for bootloader, configuration, and firmware image storage in microcontroller-based systems |
| Supply Voltage | 1.65–1.95 V; enables direct integration with 1.8V logic domains without level-shifting |
| Max Clock Frequency | 40 MHz; supports high-throughput firmware reads in real-time applications |
| Erase Granularity | Uniform 4 KByte sectors and 64 KByte overlay blocks; allows fine-grained updates without full chip reprogramming |
| Page Size | 256 bytes; aligns with common MCU cache line and DMA buffer sizes for efficient writes |
| Endurance & Retention | 100,000 cycles / >20 years at 85°C; validated for long-life industrial deployments |
| Active Read Current | 4 mA typical at 40 MHz; minimizes dynamic power during frequent code fetches |
| Power-down Current | 2 µA typical; critical for battery-powered sensor nodes during sleep states |
Pinout & Package
Package: 8-contact USON (2 mm × 3 mm), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command sequences; deassertion places device in standby mode |
| SO/SIO1 | Serial Data Output / Dual I/O Line 1 | Outputs MSB-first data during Read; serves as odd-bit (D7/D5/D3/D1) output in Dual I/O modes |
| WP# | Write Protect | Enables lock-down of Block-Protection bits (BP0–BP2, TB, BPL) when driven low; disables software write protection when high |
| VSS | Ground | Reference return path for all digital and analog circuitry; requires low-impedance PCB connection |
| VDD | Power Supply | 1.65–1.95 V supply input; bypass capacitor (0.1 µF) required near pin for noise suppression |
| HOLD# | Hold Control | Pauses ongoing SPI transaction without deselecting device; requires synchronization with SCK low state |
| SCK | Serial Clock | Timing reference for all SPI transfers; sampled on rising edge for inputs, drives outputs on falling edge |
| SI/SIO0 | Serial Data Input / Dual I/O Line 0 | Accepts commands, addresses, and data; serves as even-bit (D6/D4/D2/D0) output in Dual I/O modes |
Key Features
| Feature | Design Value |
|---|---|
| Dual I/O Interface Support | Enables 3BH (Fast-Read Dual-Output) and BBH (Fast-Read Dual I/O) commands, doubling effective throughput versus standard SPI Read |
| SuperFlash Technology | Split-gate cell design reduces program/erase current and time, lowering total energy per operation by up to 50% vs conventional flash |
| Flexible Erase Architecture | Independent 4 KByte sector and 64 KByte block erase permits partial firmware updates without disrupting adjacent code or config data |
| Hardware Write Protection | WP# and HOLD# pins provide deterministic, glitch-immune control over memory modification and bus arbitration |
| Industrial Temperature Range | Rated −40°C to +85°C; qualified for deployment in automotive body electronics, industrial HMIs, and outdoor IoT gateways |
| RoHS Compliance | Meets EU Directive 2011/65/EU; supports lead-free reflow assembly and global environmental compliance requirements |
Applications
| Firmware Storage in MCU-Based Edge Nodes | Secure Bootloader Image Storage |
|---|---|
Use Scenario: Storing application firmware and OTA update images in battery-powered wireless sensor nodes with ARM Cortex-M0+ MCUs. IC Role / Device Role / Timing Role: Non-volatile code storage device interfaced via SPI; provides deterministic 40 MHz read access for fast boot and low-latency instruction fetch. Use Value: 2 µA power-down current extends 10-year battery life; 4 KByte sector erase enables atomic firmware patching without full reflash. | Use Scenario: Holding immutable bootloader code that validates signed application images before execution in medical diagnostic equipment. IC Role / Device Role / Timing Role: Trusted boot storage element; accessed early in reset sequence to load verified startup code into SRAM. Use Value: Hardware WP# pin and BPL-enabled status register lockdown prevent runtime corruption or unauthorized modification of boot code. |
| Configuration Parameter Storage in Industrial PLCs | FPGA Bitstream Storage in Compact Test Equipment |
Use Scenario: Retaining calibrated sensor offsets, PID tuning parameters, and user-defined I/O mapping tables across power cycles in programmable logic controllers. IC Role / Device Role / Timing Role: Persistent configuration memory mapped via SPI; updated infrequently but requiring guaranteed write integrity. Use Value: 100,000 endurance cycles support decades of field calibration events; software block protection prevents accidental overwrite of critical settings. | Use Scenario: Storing Xilinx Spartan-7 FPGA configuration bitstreams in portable automated test equipment with tight board area constraints. IC Role / Device Role / Timing Role: Configuration memory for FPGA initialization; loaded on power-up via dedicated SPI master controller. Use Value: 2 mm × 3 mm USON package saves >60% board area vs SOIC-8; 40 MHz read speed reduces system boot time to <150 ms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q40EWBYIG | 4 Mbit, 1.7–1.95 V, 104 MHz Quad SPI, 4 KByte sectors, 100K endurance, same USON-8 package | Supports QPI and DTR modes for higher bandwidth; lacks HOLD# pin; different status register layout | Select for designs requiring >40 MHz throughput or quad I/O expansion; verify hold functionality is not needed |
| Cypress S25FL004K0XMFI011 | 4 Mbit, 2.7–3.6 V, 80 MHz SPI, 4 KByte sectors, 100K endurance, SOIC-8 only | Higher voltage range incompatible with 1.8V systems; no dual I/O support; includes SFDP for auto-configuration | Select only if migrating from legacy 3.3V designs; requires level-shifting for 1.8V MCU interfaces |
Compared with W25Q40EWBYIG and S25FL004K0XMFI011, the SST25WF040BT-40I/SN uniquely delivers 1.8V operation with dual I/O acceleration and HOLD#/WP# hardware controls in a space-saving USON package-making it optimal for new 1.8V embedded designs prioritizing footprint, power, and deterministic bus control.
Availability
SST25WF040BT-40I/SN is available at Aetrix Electronics and suitable for firmware storage, secure bootloader implementation, industrial configuration retention, and FPGA bitstream loading requiring stable component supply and long-term lifecycle assurance.
Supply support for SST25WF040BT-40I/SN 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 company specializing in microcontrollers, analog devices, and memory solutions for embedded control applications.
The SST25WF040BT-40I/SN belongs to Microchip's Serial Flash 25 Series, designed specifically for low-voltage, low-power, high-reliability code and data storage in space-constrained industrial and IoT endpoints.
FAQ
What is the operating voltage range of the SST25WF040BT-40I/SN?
The SST25WF040BT-40I/SN operates from 1.65 V to 1.95 V. This narrow 1.8V nominal range eliminates the need for external voltage translation when interfacing with modern 1.8V microcontrollers and FPGAs. Operation outside this range may cause unreliable read/write behavior or permanent damage. The device draws only 4 mA typical active current and just 2 µA in power-down mode at these voltages.
Does the SST25WF040BT-40I/SN support dual I/O read commands?
Yes, the SST25WF040BT-40I/SN supports two dual I/O read instructions: Fast-Read Dual-Output (3BH) and Fast-Read Dual I/O (BBH). Both operate at up to 40 MHz and use SI/SIO0 and SO/SIO1 pins to transfer address and data in parallel, effectively doubling throughput versus standard SPI Read (03H). These commands require proper initialization of the status register and are detailed in Table 5-1 of the official Microchip datasheet DS20005193E.
What is the memory organization of the SST25WF040BT-40I/SN?
The SST25WF040BT-40I/SN contains 4 Mbit (512 KByte) of SuperFlash memory organized into 128 uniform 4 KByte sectors and eight 64 KByte overlay erasable blocks. Each sector can be erased independently in 40 ms (typical), and each block in 80 ms (typical). The device supports page programming in 256-byte increments, with a typical programming time of 0.8 ms per page. This hierarchical structure enables efficient partial updates without full chip erasure.
How does hardware write protection work on the SST25WF040BT-40I/SN?
Hardware write protection on the SST25WF040BT-40I/SN is implemented via the WP# pin and status register bits (BP0–BP2, TB, BPL). When WP# is driven low, it enables the BPL bit; setting BPL=1 locks the block protection configuration, preventing further changes to BP0–BP2 and TB. Software write protection is configured through these bits to protect top or bottom memory regions (e.g., 1/8, 1/4, or 1/2 blocks). The WP# pin must be tied high or controlled externally to allow reconfiguration.
What package type is used for the SST25WF040BT-40I/SN?
The SST25WF040BT-40I/SN uses an 8-contact USON (Ultra Thin Small Outline No-lead) package measuring 2 mm × 3 mm with 0.5 mm pitch. This RoHS-compliant, moisture-sensitive-level-3 (MSL-3) package offers significantly smaller footprint and lower profile than the alternative 8-lead SOIC variant, making it ideal for compact wearable, sensor, and portable electronics where board space is constrained.
SST25WF040BT-40I/SN 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:
- 40 MHz
- Write Cycle Time - Word, Page:
- 1ms
- Access Time:
- -
- Voltage - Supply:
- 1.65V ~ 1.95V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SST25WF040BT-40I/SN FAQ
1.How can I place an order for SST25WF040BT-40I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25WF040BT-40I/SN 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 SST25WF040BT-40I/SN reliable?
The price and inventory of SST25WF040BT-40I/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25WF040BT-40I/SN is usually 5 days.
3.What payment methods are accepted for SST25WF040BT-40I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25WF040BT-40I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25WF040BT-40I/SN?
SST25WF040BT-40I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25WF040BT-40I/SN 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 SST25WF040BT-40I/SN?
For technical support, including SST25WF040BT-40I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25WF040BT-40I/SN requirements.
6.How does Aetrix verify that SST25WF040BT-40I/SN is sourced from the original manufacturer or authorized distributors?
All SST25WF040BT-40I/SN 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 SST25WF040BT-40I/SN meets industry standards.
7.What is the process for return or replacement of SST25WF040BT-40I/SN?
All SST25WF040BT-40I/SN units undergo pre-shipment inspection (PSI). If there is an issue with SST25WF040BT-40I/SN, 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 SST25WF040BT-40I/SN part is unused and in its original packaging.
Return procedure for SST25WF040BT-40I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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