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Microchip Technology SST25WF020AT-40I/MF
- Part No.:
- SST25WF020AT-40I/MF
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
SST25WF020AT-40I/MF.pdf
- Description:
- IC FLASH 2MBIT SPI 40MHZ 8WDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,674
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Product details
Overview
SST25WF020AT-40I/MF from Microchip Technology is a 2 Mbit (256 KByte) 1.8V SPI Serial Flash memory IC with single-supply operation (1.65–1.95 V), 40 MHz high-speed read capability, and industrial temperature range (–40°C to +85°C). It features uniform 4 KByte sectors and 64 KByte overlay blocks, 256-byte page programming, and hardware/software write protection for embedded firmware storage in microcontroller-based systems.
For engineers reviewing the SST25WF020AT-40I/MF datasheet, SST25WF020AT-40I/MF pinout, SST25WF020AT-40I/MF application, or SST25WF020AT-40I/MF equivalent, key selection considerations include its 1.65–1.95 V supply compatibility with low-voltage MCUs, 40 MHz High-Speed Read mode, HOLD#/WP# dual hardware control pins, SuperFlash reliability (100,000 erase/write cycles, >20 years data retention), and WDFN-8 (5 mm × 6 mm) package footprint.
Technical Context
The SST25WF020AT-40I/MF implements a four-wire SPI interface compliant with Mode 0 and Mode 3 clock polarity/phasing, supporting both standard (25 MHz) and high-speed (40 MHz) read operations with dummy-cycle timing. Its internal architecture uses proprietary SuperFlash split-gate technology with thick-oxide tunneling injector, enabling lower program/erase current and shorter erase times versus conventional flash.
Memory organization comprises 64 uniform 4 KByte sectors and four 64 KByte overlay erasable blocks. Write-enable sequencing requires explicit WREN instruction before any Program/Erase command, and status register polling (BUSY bit) is mandatory for end-of-write detection - no RDY/BSY output pin is provided.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256 KByte), organized as 64 × 4 KByte sectors and 4 × 64 KByte blocks |
| Supply Voltage | 1.65–1.95 V - enables direct interfacing with 1.8 V logic families and ultra-low-power SoCs |
| Max Clock Frequency | 40 MHz - supports High-Speed Read (0BH opcode) with 1 dummy byte for throughput up to 40 MB/s |
| Endurance | 100,000 program/erase cycles - sufficient for frequent firmware update or configuration logging |
| Data Retention | Greater than 20 years at +85°C - validated for long-life industrial deployments |
| Active Read Current | 4 mA typical at 40 MHz - enables low-power boot-time code execution |
| Power-down Current | 4 µA typical - reduces system standby power when flash is idle |
Pinout & Package
Package: 8-contact WDFN (5 mm × 6 mm, 0.5 mm pitch), moisture-sensitive level 3, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low during full command sequence; high state places device in Standby mode |
| SO | Serial Data Output | Tri-state output; data shifted out on falling edge of SCK in both Mode 0 and Mode 3 |
| WP# | Write Protect | Hardware enable/disable of Block-Protection Lock-Down (BPL) bit; low = BPL active, high = BPL disabled |
| VSS | Ground | Reference return path for all I/O and core circuitry; requires low-impedance PCB connection |
| VDD | Power Supply | 1.65–1.95 V supply input; decoupling capacitor (0.1 µF) required within 5 mm of pin |
| HOLD# | Hold Control | Pauses ongoing SPI transaction without deselecting device; requires synchronous edge alignment with SCK low state |
| SCK | Serial Clock | Input timing reference; commands/data latched on rising edge; SO driven on falling edge |
| SI | Serial Data Input | Command, address, and data input; sampled on rising edge of SCK; MSB-first protocol |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell with thick-oxide tunneling injector delivers lower program current and faster erase vs. standard NOR flash |
| Flexible Erase Granularity | Independent 4 KByte sector erase (40 ms typ.) and 64 KByte block erase (80 ms typ.) enable fine-grained firmware partitioning |
| Dual Hardware Protection | HOLD# suspends SPI transfers mid-sequence; WP# enables/disables status register lockdown for secure field updates |
| Deep Power-Down Mode | 4 µA standby current with ABH release command - ideal for battery-backed or energy-harvesting systems |
| Software Block Protection | BP0/BP1/TB bits in status register allow configurable top/bottom memory locking (1/4 or 1/2 blocks) without external hardware |
Applications
| IoT Edge Node Firmware Storage | Industrial PLC Configuration Memory |
|---|---|
Use Scenario: Storing bootloader, application firmware, and calibration tables in battery-powered wireless sensor nodes with strict power budgets. IC Role / Device Role / Timing Role: Non-volatile code storage accessed during MCU boot and over-the-air updates; operates at 40 MHz during firmware load to minimize wake time. Use Value: 4 µA deep power-down current extends battery life; 100,000-cycle endurance supports frequent OTA patching; 1.65–1.95 V supply matches energy-harvesting PMIC outputs. | Use Scenario: Retaining user-defined ladder logic, I/O mapping, and alarm thresholds across power cycles in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Configuration EEPROM replacement; accessed via SPI during startup and runtime parameter changes; write-protected during normal operation using WP# and status register bits. Use Value: Industrial temperature rating (–40°C to +85°C) ensures reliability in uncontrolled cabinet environments; sector erase allows safe reprogramming of individual function blocks without full chip erase. |
| Medical Device Boot Image Storage | Automotive Body Control Module NVM |
Use Scenario: Holding certified boot images and safety-critical diagnostic code in portable ultrasound or infusion pumps requiring regulatory traceability. IC Role / Device Role / Timing Role: Secure firmware repository; write-protection enforced via hardware WP# pin and software BPL bit to prevent unauthorized modification. Use Value: >20-year data retention meets FDA 21 CFR Part 11 long-term recordkeeping requirements; RoHS compliance supports global medical certifications. | Use Scenario: Storing vehicle-specific configuration (e.g., door lock behavior, lighting profiles) and fault logs in BCMs where space and thermal constraints limit package options. IC Role / Device Role / Timing Role: Compact NVM element soldered directly onto BCM PCB; WDFN-8 footprint minimizes board area; HOLD# enables safe interrupt handling during CAN message processing. Use Value: 5 mm × 6 mm WDFN package fits dense automotive layouts; –40°C to +85°C rating satisfies AEC-Q100 Grade 3 ambient requirements; fast 40 ms sector erase enables rapid log rotation. |
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 W25Q20EW | 2 Mbit density, 1.7–2.0 V supply, 104 MHz Dual/Quad SPI; lacks HOLD# pin and deep power-down mode | Higher bandwidth but requires Quad SPI controller support; no hardware hold function limits real-time system responsiveness | Select W25Q20EW only if host MCU supports Quad SPI and higher throughput justifies loss of HOLD# and deeper sleep modes |
| Cypress S25FL032P | 32 Mbit density, 2.7–3.6 V supply, 80 MHz SPI; incompatible voltage range and larger capacity | Not drop-in replaceable due to 3.3 V requirement and 16× larger memory map; requires PCB redesign and firmware address remapping | Choose S25FL032P only for new designs needing >2 Mbit capacity and 3.3 V compatibility - not suitable as direct alternative |
Compared with Winbond W25Q20EW and Cypress S25FL032P, the SST25WF020AT-40I/MF uniquely balances ultra-low-voltage operation (1.65–1.95 V), hardware HOLD# for deterministic SPI suspension, and 4 µA deep power-down - making it optimal for space-constrained, battery-sensitive 1.8 V embedded systems where timing predictability and energy efficiency outweigh raw bandwidth needs.
Availability
SST25WF020AT-40I/MF is available at Aetrix Electronics and suitable for IoT edge node firmware storage, industrial PLC configuration memory, and medical device boot image storage requiring stable component supply and long-term lifecycle assurance.
Supply support for SST25WF020AT-40I/MF 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, with emphasis on embedded control and reliability-critical applications.
The SST25WF020AT-40I/MF belongs to Microchip's Serial Flash 25 Series, designed specifically for low-voltage, high-reliability firmware and configuration storage in space- and power-constrained embedded systems.
FAQ
What is the operating voltage range of the SST25WF020AT-40I/MF?
The SST25WF020AT-40I/MF operates from 1.65 V to 1.95 V. This narrow 1.8 V nominal range enables direct integration with low-power microcontrollers and PMICs without level-shifting. Operation outside this window may cause undefined behavior or failure to execute commands such as Page-Program or Sector-Erase. The SST25WF020AT-40I/MF datasheet specifies that VDD must remain within these limits during all active and standby states.
Does the SST25WF020AT-40I/MF support Quad SPI mode?
No, the SST25WF020AT-40I/MF supports only standard four-wire SPI (single I/O) in Mode 0 and Mode 3. It does not implement Dual or Quad SPI protocols, nor does it have dedicated IO2/IO3 pins. All commands, addresses, and data are transferred serially via SI and SO lines. The SST25WF020AT-40I/MF achieves 40 MHz read throughput using High-Speed Read (0BH) with one dummy byte, not parallel I/O lanes.
How is write protection implemented on the SST25WF020AT-40I/MF?
The SST25WF020AT-40I/MF implements dual-layer write protection: hardware via the WP# pin (enabling/disabling status register lockdown) and software via Block-Protection bits (BP0, BP1, TB) in the status register. When WP# is low and BPL=1, the protection bits become read-only. The SST25WF020AT-40I/MF allows selective locking of top or bottom memory quarters/halves, with full array protection possible when BP0=BP1=1.
What package type is used for the SST25WF020AT-40I/MF?
The SST25WF020AT-40I/MF uses an 8-contact WDFN package measuring 5 mm × 6 mm with 0.5 mm pitch. This thermally enhanced, lead-free, RoHS-compliant package provides better thermal dissipation than SOIC-8 and smaller footprint than USON-8. The SST25WF020AT-40I/MF WDFN variant is designated by the "/MF" suffix per Microchip's ordering nomenclature.
Can the SST25WF020AT-40I/MF be used in automotive applications?
The SST25WF020AT-40I/MF is rated for industrial temperature (–40°C to +85°C) and is not AEC-Q200 qualified. While it may function in some under-hood or cabin environments, Microchip does not guarantee automotive-grade reliability, qualification testing, or extended temperature support. For automotive body control or infotainment modules, designers should verify system-level validation and consider AEC-Q100-qualified alternatives. The SST25WF020AT-40I/MF is intended for industrial, medical, and consumer embedded use.
SST25WF020AT-40I/MF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 40 MHz
- Write Cycle Time - Word, Page:
- 3.5ms
- 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-WDFN (5x6)
SST25WF020AT-40I/MF FAQ
1.How can I place an order for SST25WF020AT-40I/MF through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25WF020AT-40I/MF 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 SST25WF020AT-40I/MF reliable?
The price and inventory of SST25WF020AT-40I/MF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25WF020AT-40I/MF is usually 5 days.
3.What payment methods are accepted for SST25WF020AT-40I/MF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25WF020AT-40I/MF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25WF020AT-40I/MF?
SST25WF020AT-40I/MF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25WF020AT-40I/MF 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 SST25WF020AT-40I/MF?
For technical support, including SST25WF020AT-40I/MF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25WF020AT-40I/MF requirements.
6.How does Aetrix verify that SST25WF020AT-40I/MF is sourced from the original manufacturer or authorized distributors?
All SST25WF020AT-40I/MF 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 SST25WF020AT-40I/MF meets industry standards.
7.What is the process for return or replacement of SST25WF020AT-40I/MF?
All SST25WF020AT-40I/MF units undergo pre-shipment inspection (PSI). If there is an issue with SST25WF020AT-40I/MF, 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 SST25WF020AT-40I/MF part is unused and in its original packaging.
Return procedure for SST25WF020AT-40I/MF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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