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Microchip Technology SST25WF040B-40I/SN
- Part No.:
- SST25WF040B-40I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SST25WF040B-40I/SN.pdf
- Description:
- IC FLASH 4MBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:893
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Product details
Overview
SST25WF040B-40I/SN from Microchip Technology is a 4 Mbit (512 KByte), 1.8V SPI serial flash memory IC with SuperFlash technology, supporting 40 MHz high-speed read, dual-output and dual I/O modes, and uniform 4 KByte sector/64 KByte block erase - deployed in embedded firmware storage, boot code retention, and configuration data logging for industrial microcontrollers.
For engineers reviewing the SST25WF040B-40I/SN datasheet, SST25WF040B-40I/SN pinout, SST25WF040B-40I/SN application, or SST25WF040B-40I/SN equivalent, key selection criteria include single-supply 1.65–1.95 V operation, industrial temperature range (−40°C to +85°C), SOIC-8 and USON-8 package compatibility, and hardware/software write protection with HOLD#/WP# pins.
Technical Context
The SST25WF040B-40I/SN implements a four-wire SPI interface compliant with Mode 0 and Mode 3 timing, using SCK, SI/SIO0, SO/SIO1, CE#, WP#, and HOLD# signals. Its SuperFlash split-gate cell architecture enables lower program/erase current and faster erase times versus conventional NOR flash.
It supports three high-speed read variants: standard Read (03H, up to 30 MHz), High-Speed Read (0BH, up to 40 MHz with dummy cycle), and dual-mode instructions - Fast-Read Dual-Output (3BH) and Fast-Read Dual I/O (BBH) - both operating at 40 MHz with concurrent address/data transfer on SIO0/SIO1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512 KByte), organized as 128 × 4 KByte sectors and 8 × 64 KByte overlay blocks |
| Supply Voltage | 1.65–1.95 V - enables direct integration with 1.8 V logic domains without level shifting |
| Max Clock Frequency | 40 MHz - supports high-throughput firmware reads and fast configuration loading |
| Page Program Size | 256 bytes/page - aligns with typical MCU bootloader page boundaries and minimizes partial-write overhead |
| Erase Endurance | 100,000 program/erase cycles - suitable for field-upgradable firmware with frequent minor updates |
| Data Retention | Greater than 20 years - ensures long-term reliability in unpowered industrial deployments |
| Active Read Current | 4 mA (typical) - reduces system power budget during active firmware execution |
| Power-down Standby | 2 µA (typical) - enables ultra-low-power sleep states in battery-backed or energy-harvested systems |
Pinout & Package
Available in 8-lead SOIC (150 mil) and 8-contact USON (2 mm × 3 mm) packages. Both share identical pin functions and electrical behavior.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command sequences to maintain SPI transaction continuity |
| SCK | Serial Clock | Input timing reference; rising edge latches SI/SIO0 input, falling edge drives SO/SIO1 output |
| SI / SIO0 | Serial Data Input / Dual I/O | Primary data input in standard mode; bidirectional in Dual I/O mode (even bits A22–A0, D6–D0) |
| SO / SIO1 | Serial Data Output / Dual I/O | Primary data output in standard mode; bidirectional in Dual I/O mode (odd bits A23–A1, D7–D1) |
| WP# | Write Protect | Hardware lock for status register BPL bit; enables irreversible lockdown of block-protection settings |
| HOLD# | Hold Control | Pauses ongoing SPI sequence without deselecting device - preserves internal address pointer and state |
| VDD | Power Supply | 1.65–1.95 V supply; powers core logic, interface, and SuperFlash array |
| VSS | Ground | Reference return path for all digital and analog circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Dual I/O Read Support (BBH) | Reduces instruction latency by accepting address bits at 2 bits/clock cycle - cuts address setup time by 50% vs standard SPI |
| Flexible Erase Granularity | Independent 4 KByte sector and 64 KByte block erase - enables selective firmware patching without full chip erase |
| End-of-Write Detection | Software-pollable BUSY bit in status register - eliminates need for fixed delay timers in host firmware |
| Hardware Write Protection | WP# pin controls BPL bit lock-down - prevents accidental overwrite of critical boot sectors in field-deployed units |
| Ultra-Low Power Modes | 2 µA power-down standby - extends battery life in always-on IoT edge nodes with infrequent firmware access |
Applications
| Firmware Boot Storage | Industrial Configuration Logging |
|---|---|
Use Scenario: Stores MCU boot code and initial bootloader in space-constrained PLC controllers requiring cold-start reliability. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped via SPI XIP or DMA fetch; accessed during power-on reset sequence. Use Value: 40 MHz High-Speed Read (0BH) reduces boot latency by >30% vs legacy 30 MHz flash, accelerating system readiness. |
Use Scenario: Logs sensor calibration parameters and operational thresholds in factory-floor HMIs with periodic write cycles. IC Role / Device Role / Timing Role: Parameter storage with software-block protection (BP0–BP2) to prevent corruption during brown-out events. Use Value: 100,000-cycle endurance and 20-year data retention ensure 10+ years of unattended operation without refresh. |
| Wireless Module Firmware Update | Medical Device Calibration Data |
Use Scenario: Hosts over-the-air (OTA) firmware images in BLE/Wi-Fi modules where update integrity and partial rewrites are critical. IC Role / Device Role / Timing Role: Dual I/O (BBH) read mode enables rapid image verification pre-commit; Page-Program (02H) writes 256-byte chunks atomically. Use Value: 0.8 ms/page program time and 40 ms sector erase allow sub-second OTA commit windows, minimizing downtime. |
Use Scenario: Stores FDA-mandated calibration coefficients and usage history in portable diagnostic equipment with strict traceability. IC Role / Device Role / Timing Role: Secure parameter vault with HOLD#-enabled suspend during interrupt-driven measurement capture. Use Value: Hardware HOLD# preserves SPI state mid-read during high-priority ADC sampling - avoids bus contention or retry logic. |
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 W25Q40EW | Same density (4 Mbit), 1.7–1.95 V supply, but uses Quad SPI (QPI) and DTR modes - no native Dual I/O support like SST25WF040B-40I/SN's BBH/3BH | Requires QSPI controller; not drop-in compatible with legacy dual-I/O SPI hosts | Select if migrating to QSPI for higher bandwidth; avoid if existing design relies on BBH timing or HOLD#/WP# behavior |
| Cypress S25FL004A | 4 Mbit, 2.7–3.6 V supply only - incompatible voltage domain; lacks HOLD# pin and dual I/O instructions | Requires external level-shifting and redesign of SPI timing control logic | Only viable for new 3.3 V designs without hold/suspend requirements; not a functional substitute for SST25WF040B-40I/SN |
Compared with W25Q40EW and S25FL004A, the SST25WF040B-40I/SN uniquely delivers 1.8 V operation with dual I/O read acceleration and hardware HOLD# suspend - making it optimal for power-sensitive, interrupt-driven embedded systems where voltage compatibility and deterministic SPI pause capability are mandatory.
Availability
SST25WF040B-40I/SN is available at Aetrix Electronics and suitable for industrial control firmware storage, medical device calibration logging, and wireless module OTA updates requiring stable component supply across extended product lifecycles.
Supply support for SST25WF040B-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 manufacturer specializing in microcontrollers, analog devices, and nonvolatile memory solutions for industrial, automotive, and communications markets.
The SST25WF040B-40I/SN belongs to Microchip's Serial Flash 25 Series, designed specifically for low-voltage, high-reliability embedded firmware and configuration storage in space- and power-constrained applications.
FAQ
What is the maximum clock frequency supported by SST25WF040B-40I/SN for high-speed read operations?
The SST25WF040B-40I/SN supports up to 40 MHz for High-Speed Read (0BH), Fast-Read Dual-Output (3BH), and Fast-Read Dual I/O (BBH) instructions. Standard Read (03H) is limited to 30 MHz. All timing specifications are validated across the full industrial temperature range (−40°C to +85°C) and 1.65–1.95 V supply.
Does SST25WF040B-40I/SN support Quad SPI (QSPI) or only Dual I/O?
The SST25WF040B-40I/SN does not support Quad SPI. It implements SPI Mode 0/3 with dual-line capabilities only - Fast-Read Dual-Output (3BH) and Fast-Read Dual I/O (BBH). These use SIO0 and SIO1 for concurrent data/address transfer but do not utilize four data lines like true QSPI interfaces.
How does the HOLD# pin function during an active SPI transaction in SST25WF040B-40I/SN?
In SST25WF040B-40I/SN, HOLD# suspends an ongoing SPI sequence while CE# remains low - preserving the internal address pointer and command state. SO enters high-impedance, while SI and SCK may be driven to any valid logic level. Communication resumes upon rising HOLD# edge synchronized with SCK low, without resetting the transaction.
What is the minimum and maximum supply voltage for reliable operation of SST25WF040B-40I/SN?
The SST25WF040B-40I/SN operates reliably within 1.65 V to 1.95 V. Operation outside this range - including below 1.65 V (risk of incomplete writes) or above 1.95 V (risk of accelerated wear) - is not guaranteed per the DS20005193E datasheet and may cause data corruption or reduced endurance.
Can SST25WF040B-40I/SN be used in automotive applications?
The SST25WF040B-40I/SN is rated for industrial temperature (−40°C to +85°C), not automotive AEC-Q100 qualification. While some customers deploy it in under-hood-adjacent modules, Microchip does not guarantee performance or reliability beyond its specified industrial grade - automotive designs require AEC-Q100-qualified alternatives such as SST26VF016B.
SST25WF040B-40I/SN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- 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
SST25WF040B-40I/SN FAQ
1.How can I place an order for SST25WF040B-40I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25WF040B-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 SST25WF040B-40I/SN reliable?
The price and inventory of SST25WF040B-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 SST25WF040B-40I/SN is usually 5 days.
3.What payment methods are accepted for SST25WF040B-40I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25WF040B-40I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25WF040B-40I/SN?
SST25WF040B-40I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25WF040B-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 SST25WF040B-40I/SN?
For technical support, including SST25WF040B-40I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25WF040B-40I/SN requirements.
6.How does Aetrix verify that SST25WF040B-40I/SN is sourced from the original manufacturer or authorized distributors?
All SST25WF040B-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 SST25WF040B-40I/SN meets industry standards.
7.What is the process for return or replacement of SST25WF040B-40I/SN?
All SST25WF040B-40I/SN units undergo pre-shipment inspection (PSI). If there is an issue with SST25WF040B-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 SST25WF040B-40I/SN part is unused and in its original packaging.
Return procedure for SST25WF040B-40I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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