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Microchip Technology SST25WF020-40-5I-SAF-T
- Part No.:
- SST25WF020-40-5I-SAF-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SST25WF020-40-5I-SAF-T.pdf
- Description:
- IC FLASH 2MBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,732
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Product details
Overview
SST25WF020-40-5I-SAF-T 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 within 1.65–1.95 V supply, delivers 2 mA typical active read current at 20 MHz, and targets embedded firmware storage in industrial microcontrollers and IoT edge nodes.
For engineers reviewing the SST25WF020-40-5I-SAF-T datasheet, SST25WF020-40-5I-SAF-T pinout, SST25WF020-40-5I-SAF-T application, or SST25WF020-40-5I-SAF-T equivalent, key selection considerations include its 8-lead SOIC package, RST#/HOLD# dual-function pin, software/hardware write protection, 100,000-cycle endurance, and compatibility with SPI Mode 0/3 clocking protocols.
Technical Context
This device implements a four-wire SPI interface (SCK, SI, SO, CE#) with dual-mode clock support (Mode 0 and Mode 3), enabling interoperability with diverse host controllers. Its internal SuperFlash architecture uses split-gate cells and thick-oxide tunneling injectors to achieve superior reliability over conventional NOR flash.
It supports three erase granularities-4 KByte sectors, 32 KByte blocks, and (for 2 Mbit+ variants) 64 KByte blocks-and integrates end-of-write detection via BUSY bit polling or SO pin RY/BY# status output during AAI mode. The RST#/HOLD# pin defaults to hardware reset but can be reconfigured as a suspend control via EHLD instruction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256 KByte) organized as uniform 4 KByte sectors |
| 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 in boot and update sequences |
| Endurance | 100,000 program/erase cycles - suitable for field-upgradable firmware with frequent minor updates |
| Data Retention | Greater than 100 years - ensures long-term integrity of stored configuration and calibration data |
| Active Read Current | 2 mA typical @ 20 MHz - minimizes power draw during boot-time code execution |
| Standby Current | 2 µA typical - supports ultra-low-power sleep modes in battery-operated devices |
Pinout & Package
Package: 8-lead SOIC (150 mils), RoHS compliant, industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low chip select; must remain low throughout command sequence to prevent premature termination |
| SO | Serial Data Output / RY/BY# | Primary data output; functions as ready/busy status pin during AAI programming when configured |
| WP# | Write Protect | Enables lock-down of Block-Protection bits (BP2–BP0, BPL) in status register when driven low |
| VSS | Ground | Reference return path for all I/O and core circuitry |
| VDD | Power Supply | 1.65–1.95 V supply input; decoupling capacitor required per layout guidelines |
| RST#/HOLD# | Reset or Hold Control | Defaults to hardware reset (RST#); configurable as suspend pin (HOLD#) via EHLD instruction |
| SCK | Serial Clock | Timing reference for SPI transfers; sampled on rising edge for inputs, drives outputs on falling edge |
| SI | Serial Data Input | Command, address, and data input path; latched on rising edge of SCK |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell architecture reduces program/erase time and improves endurance vs. standard NOR flash |
| Auto Address Increment (AAI) | Reduces total programming time by eliminating repeated address transmission for sequential writes |
| Dual SPI Modes (0 & 3) | Ensures compatibility with both legacy and modern SPI masters without hardware modification |
| Flexible Erase Granularity | Supports 4 KByte sectors and 32/64 KByte blocks - enables optimized wear leveling and partial firmware updates |
| Hardware Reset + Hold Pin | Single pin provides either full device reset or non-disruptive communication suspension during critical operations |
Applications
| Industrial PLC Firmware Storage | Medical Sensor Calibration Data |
|---|---|
Use Scenario: Storing boot firmware and runtime configuration in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Non-volatile code storage with fast 40 MHz read access and robust 100-year data retention. Use Value: Enables deterministic boot timing and eliminates risk of firmware corruption due to power loss during updates. | Use Scenario: Retaining calibrated sensor offset/gain coefficients across power cycles in portable diagnostic equipment. IC Role / Device Role / Timing Role: Low-power, high-reliability parameter storage accessed infrequently but requiring guaranteed integrity. Use Value: Maintains measurement accuracy over product lifetime without recalibration, supported by 2 µA standby current. |
| IoT Edge Node OTA Updates | Automotive Body Control Module Code |
Use Scenario: Hosting dual-image firmware partitions to support atomic over-the-air updates in wireless sensor nodes. IC Role / Device Role / Timing Role: Dual-sector erase capability allows safe swapping between active/inactive firmware banks. Use Value: Eliminates bricking risk during field updates by enabling rollback to known-good image if new version fails verification. | Use Scenario: Storing application code and EEPROM-emulation data in automotive body control units meeting AEC-Q100 Class 2 requirements. IC Role / Device Role / Timing Role: Industrial-grade SPI flash with –40°C to +85°C operation and 100,000-cycle endurance. Use Value: Meets automotive functional safety requirements for non-volatile storage without external error correction overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25SF021-SSHD-B | 2 Mbit, 1.7–2.0 V supply, 104 MHz DTR-capable read, no HOLD# pin, different status register map | Lacks RST#/HOLD# dual function; requires redesign of reset/suspend logic and status register handling | Choose if higher read bandwidth is critical and host supports DTR mode; verify write-protection scheme compatibility |
| W25Q20EWUXIE | 2 Mbit, 1.65–1.95 V, 133 MHz quad SPI, integrated quad enable, different erase block structure (4/32/64 KB) | Requires quad I/O routing and updated driver stack; offers faster parallel reads but adds PCB complexity | Select when system demands >40 MHz throughput and board layout accommodates extra I/O traces |
Compared with AT25SF021-SSHD-B and W25Q20EWUXIE, the SST25WF020-40-5I-SAF-T provides native RST#/HOLD# flexibility and simpler SPI Mode 0/3 compatibility, making it optimal for cost-sensitive industrial designs where pin count and firmware simplicity are prioritized over peak bandwidth.
Availability
SST25WF020-40-5I-SAF-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical sensor calibration data retention, and IoT edge node OTA updates requiring stable component supply and long-term lifecycle support.
Supply support for SST25WF020-40-5I-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 acquired Silicon Storage Technology (SST) in 2016 and maintains the Serial Flash 25 Series portfolio for embedded non-volatile memory applications.
The SST25WF020-40-5I-SAF-T belongs to the Serial Flash 25 Series, designed specifically for low-voltage, low-power, high-reliability firmware and parameter storage in space-constrained industrial and IoT systems.
FAQ
What is the maximum clock frequency supported by SST25WF020-40-5I-SAF-T?
The SST25WF020-40-5I-SAF-T supports up to 40 MHz for High-Speed Read operations using the 0BH command with dummy byte. Standard Read (03H) is rated to 20 MHz. This 40 MHz capability enables faster boot code loading and firmware updates in time-critical embedded systems, and the device maintains timing compliance across its full industrial temperature range (–40°C to +85°C).
Does SST25WF020-40-5I-SAF-T support both SPI Mode 0 and Mode 3?
Yes, SST25WF020-40-5I-SAF-T is fully compatible with both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). The device samples SI on the rising edge of SCK and drives SO on the falling edge in both modes. This dual-mode support ensures seamless integration with a wide range of microcontrollers and FPGAs without requiring hardware-level SPI controller reconfiguration.
How does the RST#/HOLD# pin function on SST25WF020-40-5I-SAF-T?
At power-on, the RST#/HOLD# pin defaults to hardware reset (RST#) functionality. It can be reconfigured as a hold pin (HOLD#) via the Enable-HOLD (EHLD) instruction (0AAH). Once set, HOLD# suspends ongoing SPI communication without deselecting the device or resetting internal state. The pin reverts to RST# only after a full power cycle. This dual-role design simplifies board layout while supporting both robust reset and non-intrusive debug/suspend use cases.
What erase block sizes are available on SST25WF020-40-5I-SAF-T?
The SST25WF020-40-5I-SAF-T supports uniform 4 KByte sector erase and 32 KByte overlay block erase. As a 2 Mbit device, it also supports 64 KByte overlay block erase - confirmed in Table 10 of the datasheet. These granularities allow precise firmware patching, wear leveling, and partitioned storage management without unnecessary bulk erases that degrade endurance.
Is SST25WF020-40-5I-SAF-T still in active production?
No, SST25WF020-40-5I-SAF-T is an obsolete (EOL) device per Microchip's DS20005016C datasheet revision 11/14. While Aetrix Electronics maintains limited legacy stock for continuity support, Microchip recommends migration paths such as the AT25SF021 or W25Q20EW series. Customers should consult Microchip Sales for official replacement guidance and verify pin, timing, and firmware compatibility before redesign.
SST25WF020-40-5I-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:
- Obsolete
- 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:
- 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-T FAQ
1.How can I place an order for SST25WF020-40-5I-SAF-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25WF020-40-5I-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 SST25WF020-40-5I-SAF-T reliable?
The price and inventory of SST25WF020-40-5I-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 SST25WF020-40-5I-SAF-T is usually 5 days.
3.What payment methods are accepted for SST25WF020-40-5I-SAF-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25WF020-40-5I-SAF-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25WF020-40-5I-SAF-T?
SST25WF020-40-5I-SAF-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25WF020-40-5I-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 SST25WF020-40-5I-SAF-T?
For technical support, including SST25WF020-40-5I-SAF-T 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-T requirements.
6.How does Aetrix verify that SST25WF020-40-5I-SAF-T is sourced from the original manufacturer or authorized distributors?
All SST25WF020-40-5I-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 SST25WF020-40-5I-SAF-T meets industry standards.
7.What is the process for return or replacement of SST25WF020-40-5I-SAF-T?
All SST25WF020-40-5I-SAF-T units undergo pre-shipment inspection (PSI). If there is an issue with SST25WF020-40-5I-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 SST25WF020-40-5I-SAF-T part is unused and in its original packaging.
Return procedure for SST25WF020-40-5I-SAF-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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