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Microchip Technology SST25WF020-40-5I-SAF
- Part No.:
- SST25WF020-40-5I-SAF
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SST25WF020-40-5I-SAF.pdf
- Description:
- IC FLASH 2MBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,354
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Product details
Overview
SST25WF020-40-5I-SAF from Microchip Technology is a 2 Mbit (256 KByte), 1.8V SPI serial flash memory IC with SuperFlash technology, supporting 40 MHz high-speed read, uniform 4 KByte sector erase, and Auto Address Increment (AAI) programming. It operates across industrial temperature range (–40°C to +85°C) and delivers 100,000 program/erase cycles with >100-year data retention - used in firmware storage for microcontroller-based embedded systems requiring low-voltage, space-constrained boot memory.
For engineers reviewing the SST25WF020-40-5I-SAF datasheet, SST25WF020-40-5I-SAF pinout, SST25WF020-40-5I-SAF application, or SST25WF020-40-5I-SAF equivalent, key selection considerations include its 1.65–1.95 V single-supply operation, dual SPI modes (0 and 3), hardware reset/hold pin flexibility, software block protection, and compatibility with SOIC-8 and WSON-8 packages.
Technical Context
The SST25WF020-40-5I-SAF implements a four-wire SPI interface (SCK, SI, SO, CE#) with Mode 0 and Mode 3 support, enabling interoperability with standard microcontroller SPI peripherals. Its internal architecture uses SST's proprietary split-gate SuperFlash cell with thick-oxide tunneling injector, delivering superior endurance and data retention versus conventional NOR flash.
It supports three erasable block granularities: uniform 4 KByte sectors, 32 KByte overlay blocks, and - uniquely for 2 Mbit and 4 Mbit variants - 64 KByte overlay blocks. The RST#/HOLD# pin functions as hardware reset by default but can be reconfigured via instruction to suspend serial communication without deselecting the device.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256 KByte) - provides sufficient space for bootloader, configuration, and firmware image storage in compact MCU systems. |
| Supply Voltage | 1.65–1.95 V - enables direct interfacing with 1.8 V logic domains without level shifting, reducing BOM count. |
| Max Clock Frequency | 40 MHz - supports high-speed read operations (e.g., 0BH command), cutting firmware load latency in real-time applications. |
| Endurance | 100,000 program/erase cycles - ensures reliable field updates over product lifetime in industrial control and IoT edge nodes. |
| Data Retention | >100 years - guarantees nonvolatile storage integrity without refresh, critical for unattended or maintenance-free deployments. |
| Erase Granularity | Uniform 4 KByte sectors + 32/64 KByte overlay blocks - allows fine-grained firmware partitioning and OTA update management. |
| Active Read Current | 2 mA typical @ 20 MHz - minimizes power draw during boot or runtime code fetch in battery-powered devices. |
| Standby Current | 2 µA typical - enables ultra-low-power sleep states in always-on sensor nodes and wearable electronics. |
Pinout & Package
Package: 8-lead SOIC (150 mil) - industry-standard footprint compatible with automated assembly and legacy PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low chip select; must remain low throughout command execution - enables multi-device SPI bus sharing with daisy-chained or decoded addressing. |
| SO | Serial Data Output | Provides read data and status (RY/BY# in AAI mode); outputs on SCK falling edge - supports both standard read and hardware busy detection. |
| WP# | Write Protect | Hardware lock-down control for Block-Protection-Lock (BPL) bit; low = enables BPL enforcement - prevents accidental register corruption during voltage transients. |
| VSS | Ground | Reference return path for all I/O and core logic - requires low-impedance connection to minimize noise coupling into sensitive flash timing paths. |
| VDD | Power Supply | 1.65–1.95 V supply input; decoupling capacitor required near pin - powers internal charge pump for erase/program operations without external HV generator. |
| RST#/HOLD# | Reset or Hold Control | Default reset function; configurable to hold mode via EHLD instruction - allows pause/resume of ongoing SPI sequences without interrupting clock or reinitializing state. |
| SCK | Serial Clock | Timing reference for all SPI transfers; sampled on rising edge for inputs, drives SO on falling edge - defines maximum 40 MHz interface bandwidth. |
| SI | Serial Data Input | Receives opcodes, addresses, and write data; latched on SCK rising edge - supports full-duplex command streaming during AAI programming. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell with thick-oxide tunneling injector enables lower program current and faster erase vs. conventional NOR - reduces total energy per operation and thermal stress. |
| Auto Address Increment (AAI) | Two-byte word programming without address retransmission - cuts full-array programming time by ~40% compared to byte-program mode, accelerating firmware updates. |
| Dual SPI Modes (0 & 3) | Compatible with both common MCU SPI controller configurations - eliminates need for custom driver logic or clock polarity inversion in mixed-vendor designs. |
| Flexible Block Protection | BP2/BP1/BP0 bits enable software-selectable protection of upper quarter, half, or full memory - supports secure bootloader + updatable application partitioning. |
| Hardware Reset/Hold Pin | Single pin serves dual role: hard reset on power-up, reconfigurable to suspend SPI traffic - simplifies board routing and enables robust recovery from communication errors. |
| Ultra-Low Standby Current | 2 µA typical - meets stringent energy budgets for battery-operated edge devices operating in extended sleep cycles (e.g., LoRaWAN sensors). |
Applications
| Firmware Storage | Secure Boot Configuration |
|---|---|
Use Scenario: Storing bootloader and application firmware for ARM Cortex-M microcontrollers in industrial gateways. IC Role / Device Role / Timing Role: Nonvolatile code storage accessed during cold start and runtime updates via SPI interface. Use Value: 40 MHz high-speed read reduces boot time by >30% vs. 20 MHz alternatives; 256 KByte capacity accommodates dual-bank OTA images. |
Use Scenario: Holding immutable root-of-trust keys and signed configuration parameters in medical diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store with hardware write protection and lock-down capability. Use Value: WP#-enabled BPL bit prevents unauthorized modification of BP2/BP1/BP0, ensuring only designated memory regions remain writable post-deployment. |
| IoT Edge Node Data Logging | Automotive Body Control Module |
Use Scenario: Cyclic logging of sensor readings (temperature, humidity, motion) in battery-powered smart agriculture nodes. IC Role / Device Role / Timing Role: Low-power persistent storage with sector-erase granularity for wear-leveling across 4 KByte pages. Use Value: 2 µA standby current extends 2xAA battery life to >5 years; uniform 4 KByte sectors simplify flash translation layer implementation. |
Use Scenario: Storing calibration data, seat position profiles, and lighting presets in automotive interior modules. IC Role / Device Role / Timing Role: Automotive-grade (–40°C to +85°C) nonvolatile memory interfaced to CAN-connected microcontrollers. Use Value: Industrial temperature rating and 100,000-cycle endurance ensure reliability over 15+ year vehicle lifetimes with frequent parameter updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF021-SSH-T | 2 Mbit, 2.3–3.6 V supply, 75 MHz max clock, no HOLD# pin, JEDEC JESD216 compliant. | Requires level-shifting for 1.8 V systems; lacks hardware hold functionality - less suitable for interrupt-driven SPI transaction pausing. | Select when higher clock speed and JEDEC SFDP compliance are prioritized over 1.8 V native operation and hold-mode flexibility. |
| W25Q20EWUXIE | 2 Mbit, 1.7–2.0 V supply, 104 MHz quad SPI, built-in QPI mode, no RST#/HOLD# pin. | Supports quad I/O for 4× throughput boost but adds pin count and layout complexity; no hardware reset/hold pin - increases software overhead for error recovery. | Select when system demands maximum read bandwidth and quad interface support, and software-managed reset/handshake is acceptable. |
Compared with AT25DF021-SSH-T and W25Q20EWUXIE, the SST25WF020-40-5I-SAF uniquely balances 1.8 V native operation, hardware hold capability, and proven SuperFlash reliability - making it optimal for cost-sensitive, space-constrained embedded systems where voltage compatibility and deterministic SPI control are critical.
Availability
SST25WF020-40-5I-SAF is available at Aetrix Electronics and suitable for firmware storage, secure boot configuration, IoT edge node data logging, and automotive body control module applications requiring stable component supply across long-lifecycle industrial programs.
Supply support for SST25WF020-40-5I-SAF 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 acquired Silicon Storage Technology (SST) in 2010 and maintains the SuperFlash serial flash portfolio, emphasizing reliability, low-power operation, and broad MCU compatibility.
The SST25WF020-40-5I-SAF belongs to the Serial Flash 25 Series, designed specifically for embedded systems needing compact, low-voltage, high-reliability nonvolatile memory with minimal external components and robust data integrity.
FAQ
What is the operating voltage range for the SST25WF020-40-5I-SAF?
The SST25WF020-40-5I-SAF operates from 1.65 V to 1.95 V - a true 1.8 V nominal supply range. This eliminates the need for level shifters when interfacing with 1.8 V microcontrollers or FPGAs. Operation outside this window may cause undefined behavior or failure to execute commands such as Byte-Program or Chip-Erase. The SST25WF020-40-5I-SAF datasheet specifies strict tolerances to ensure reliable SuperFlash cell programming and erase under low-voltage conditions.
Does the SST25WF020-40-5I-SAF support both SPI Mode 0 and Mode 3?
Yes, the SST25WF020-40-5I-SAF fully supports SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), as confirmed in the official Microchip datasheet DS20005016C. This dual-mode compatibility ensures seamless integration with diverse host processors - including STM32, NXP Kinetis, and Renesas RA families - without requiring clock polarity or phase configuration changes. The SST25WF020-40-5I-SAF samples SI on the rising edge and drives SO on the falling edge in both modes.
What package types are offered for the SST25WF020-40-5I-SAF?
The SST25WF020-40-5I-SAF is available in two RoHS-compliant packages: 8-lead SOIC (150 mil) and 8-contact WSON (5 mm × 6 mm). The SOIC variant supports through-hole and surface-mount assembly with standard reflow profiles, while the WSON offers 40% smaller footprint for space-constrained PCBs. Both packages share identical pinout and electrical characteristics - the SST25WF020-40-5I-SAF pin assignment is documented in Figure 2 of DS20005016C.
How does the RST#/HOLD# pin function on the SST25WF020-40-5I-SAF?
At power-up, the RST#/HOLD# pin defaults to hardware reset (RST#) functionality. It can be reconfigured to HOLD# mode via the Enable-HOLD (EHLD) instruction (0AAh). In HOLD# mode, the device pauses ongoing SPI sequences without deselecting CE# or resetting internal state - useful for servicing higher-priority interrupts. The SST25WF020-40-5I-SAF returns to RST# mode only after power cycle. This dual-role pin reduces system-level GPIO requirements.
Is the SST25WF020-40-5I-SAF still in active production?
No - the SST25WF020-40-5I-SAF is an obsolete (EOL) device per Microchip's official documentation (DS20005016C, dated 11/2014). While Aetrix Electronics maintains limited legacy stock for design continuity and repair, Microchip recommends migration paths such as the SST26VF016B or newer Adesto/Dialog ATXP032 series. Customers using the SST25WF020-40-5I-SAF should consult Microchip Sales for replacement guidance and verify pin- and firmware-level compatibility before redesign.
SST25WF020-40-5I-SAF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- 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:
- 60µs
- 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
SST25WF020-40-5I-SAF FAQ
1.How can I place an order for SST25WF020-40-5I-SAF through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25WF020-40-5I-SAF 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 SST25WF020-40-5I-SAF reliable?
The price and inventory of SST25WF020-40-5I-SAF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25WF020-40-5I-SAF is usually 5 days.
3.What payment methods are accepted for SST25WF020-40-5I-SAF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25WF020-40-5I-SAF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25WF020-40-5I-SAF?
SST25WF020-40-5I-SAF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25WF020-40-5I-SAF 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 SST25WF020-40-5I-SAF?
For technical support, including SST25WF020-40-5I-SAF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25WF020-40-5I-SAF requirements.
6.How does Aetrix verify that SST25WF020-40-5I-SAF is sourced from the original manufacturer or authorized distributors?
All SST25WF020-40-5I-SAF 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 SST25WF020-40-5I-SAF meets industry standards.
7.What is the process for return or replacement of SST25WF020-40-5I-SAF?
All SST25WF020-40-5I-SAF units undergo pre-shipment inspection (PSI). If there is an issue with SST25WF020-40-5I-SAF, 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 SST25WF020-40-5I-SAF part is unused and in its original packaging.
Return procedure for SST25WF020-40-5I-SAF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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