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Microchip Technology SST25WF020-40-5I-QAE
- Part No.:
- SST25WF020-40-5I-QAE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
SST25WF020-40-5I-QAE.pdf
- Description:
- IC FLASH 2MBIT SPI 40MHZ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,511
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Product details
Overview
SST25WF020-40-5I-QAE 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 boot code and configuration data in space-constrained embedded systems.
For engineers reviewing the SST25WF020-40-5I-QAE datasheet, SST25WF020-40-5I-QAE pinout, SST25WF020-40-5I-QAE application, or SST25WF020-40-5I-QAE equivalent, key selection considerations include its 1.65–1.95 V single-supply operation, dual SPI modes (0 and 3), hardware reset or hold pin option, software write protection via status register bits BP2–BP0, and compatibility with SOIC-8 and WSON-8 packages.
Technical Context
This device implements a four-wire SPI interface (SCK, SI, SO, CE#) with Mode 0 and Mode 3 support, enabling low-pin-count integration into host MCU systems. Its SuperFlash split-gate cell architecture provides faster erase times (62 ms sector-erase, 125 ms chip-erase) and lower active current (2 mA @ 20 MHz) versus conventional NOR flash.
It features dual-function RST#/HOLD# pin (default reset, configurable to suspend serial sequences), WP#-controlled lock-down of block-protection bits (BPL), and end-of-write detection via BUSY bit polling or SO pin RY/BY# status in AAI mode - all critical for deterministic firmware update sequencing in real-time embedded applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256 KByte) - fixed capacity for boot code and parameter storage in mid-tier MCUs |
| Supply Voltage | 1.65–1.95 V - enables direct connection to 1.8 V I/O domains without level shifting |
| Max Clock Frequency | 40 MHz - supports high-throughput firmware reads in time-critical boot phases |
| Erase Granularity | Uniform 4 KByte sectors + 32 KByte blocks - allows fine-grained updates without full chip erase |
| Endurance & Retention | 100,000 cycles / >100 years - validated for field-updatable systems requiring long service life |
| Active Read Current | 2 mA typical @ 20 MHz - minimizes power draw during frequent configuration reads |
| Standby Current | 2 µA typical - supports ultra-low-power sleep modes in battery-backed devices |
Pinout & Package
Package: 8-contact WSON (5 mm × 6 mm), RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low selection signal; must remain low throughout command execution to prevent premature termination |
| SO | Serial Data Output / RY/BY# | Primary data output; configurable as ready/busy status pin during AAI programming for hardware flow control |
| WP# | Write Protect | Enables lock-down of status register BP bits when driven low; prevents accidental firmware corruption |
| 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; decoupling capacitor (≥1 µF) required within 5 mm of pin |
| RST#/HOLD# | Reset or Hold Control | Default hardware reset pin; programmable to suspend SPI transactions without deselecting device |
| SCK | Serial Clock | Timing reference for SI/SO transfers; supports both SPI Mode 0 (idle low) and Mode 3 (idle high) |
| SI | Serial Data Input | Command, address, and data input path; sampled on rising edge of SCK per SPI protocol |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell with thick-oxide tunneling injector enables 62 ms sector erase vs. >100 ms in standard NOR flash |
| Auto Address Increment (AAI) | Reduces multi-byte programming time by eliminating repeated address transmission - critical for fast firmware patching |
| Dual SPI Modes | Hardware-compatible with both Mode 0 and Mode 3 hosts - eliminates need for bus-level protocol translation logic |
| Flexible Block Protection | BP2/BP1/BP0 bits enable software-selectable protection of upper quarter/half/full memory - secures bootloader region |
| Low-Power Standby | 2 µA typical current allows continuous retention during MCU deep-sleep without compromising battery life |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing calibrated sensor offsets, alarm thresholds, and device-specific calibration data in Class II medical instruments with regulatory traceability requirements. IC Role / Device Role / Timing Role: Non-volatile configuration store accessed at power-on and during field recalibration; supports JEDEC ID verification for firmware authenticity. Use Value: 100-year data retention ensures calibration integrity over product lifetime without periodic refresh; WP# pin enables hardware-enforced write lockdown during normal operation. |
Use Scenario: Holding boot firmware and secure boot keys for ARM Cortex-M4-based patient monitoring units operating in extended temperature environments. IC Role / Device Role / Timing Role: Primary boot memory mapped via MCU XIP or DMA-loaded; high-speed 40 MHz read enables sub-100 ms cold boot. Use Value: 40 MHz High-Speed Read instruction reduces boot latency; industrial temperature rating (–40°C to +85°C) guarantees reliability in uncontrolled clinical settings. |
| Smart Energy Meter Bootloader | Automotive Body Control Module (BCM) Parameter Table |
Use Scenario: Storing encrypted bootloader and OTA update staging area in ANSI C12.22-compliant electricity meters deployed outdoors. IC Role / Device Role / Timing Role: Dual-role memory: executes verified bootloader code and buffers signed firmware images prior to authenticated flash update. Use Value: AAI programming cuts OTA patch time by ~40% vs. byte-program; 100,000-cycle endurance supports 10+ years of field updates. |
Use Scenario: Retaining vehicle-specific lighting profiles, door lock timing, and seat position presets in 12 V automotive BCMs with load-dump immunity. IC Role / Device Role / Timing Role: Secondary non-volatile store synchronized with main MCU EEPROM; accessed during ignition-on initialization. Use Value: 1.65–1.95 V operation tolerates brown-out conditions during cranking; RST#/HOLD# pin allows safe suspend during CAN bus arbitration spikes. |
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, 2.7–3.6 V supply, 85 MHz max clock, no HOLD# pin, SOIC-8 only | Requires external level shifter for 1.8 V hosts; lacks suspend capability for interrupt-driven updates | Select when higher speed and wider voltage range outweigh 1.8 V native operation and hold functionality |
| W25Q20EWUXIE | 2 Mbit, 1.7–2.0 V supply, 104 MHz quad SPI, WSON-8, no RST#/HOLD# pin | Supports QPI for bandwidth scaling but removes hardware reset/suspend - increases MCU software complexity | Select when system demands quad I/O throughput and can manage reset via GPIO; not drop-in for RST#/HOLD# use cases |
Compared with AT25DF021-SSH-T and W25Q20EWUXIE, the SST25WF020-40-5I-QAE uniquely combines 1.8 V native operation, hardware hold capability, and SuperFlash endurance - making it optimal for resource-constrained, safety-aware embedded designs where voltage compatibility and deterministic transaction control are non-negotiable.
Availability
SST25WF020-40-5I-QAE is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, smart energy meter bootloaders, and automotive body control module parameter tables requiring stable component supply across extended lifecycle programs.
Supply support for SST25WF020-40-5I-QAE 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 as part of its broad memory portfolio, emphasizing reliability, low-power operation, and industrial-grade qualification.
The SST25WF020-40-5I-QAE belongs to the Serial Flash 25 Series, designed specifically for cost-sensitive, space-constrained embedded systems needing robust, low-voltage non-volatile storage with deterministic timing behavior.
FAQ
What is the maximum clock frequency supported by the SST25WF020-40-5I-QAE during high-speed read operations?
The SST25WF020-40-5I-QAE supports up to 40 MHz during High-Speed Read operations using the 0BH instruction with a dummy byte. This is confirmed in the official EOL datasheet DS20005016C, Table 10. The standard Read instruction (03H) is limited to 20 MHz. The 40 MHz capability enables faster boot code loading and configuration retrieval in time-critical applications, and the SST25WF020-40-5I-QAE achieves this without requiring external clock multiplication or PLL circuitry.
Does the SST25WF020-40-5I-QAE support both SPI Mode 0 and Mode 3, and how is mode selection handled?
Yes, the SST25WF020-40-5I-QAE natively supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as explicitly stated in the datasheet Section "Device Operation". No configuration register or command is required - the device automatically adapts to the host's idle clock state. In Mode 0, SCK idles low and data is sampled on the rising edge; in Mode 3, SCK idles high with identical sampling timing. This dual-mode support ensures interoperability with diverse MCU SPI peripherals without firmware modification, and the SST25WF020-40-5I-QAE maintains full functionality in either mode.
How does the RST#/HOLD# pin function on the SST25WF020-40-5I-QAE, and can its mode be changed dynamically?
The RST#/HOLD# pin on the SST25WF020-40-5I-QAE defaults to hardware reset (RST#) at power-on. It can be reconfigured to HOLD# mode via the Enable-Hold (EHLD) instruction (0AAH), after which it remains in HOLD# mode until the next power cycle. In HOLD# mode, asserting the pin low pauses ongoing SPI transactions without resetting internal state or deselecting the device - useful for servicing higher-priority interrupts. The SST25WF020-40-5I-QAE exits HOLD# only when the pin is driven high while SCK is low, ensuring glitch-free resumption. This dual-role pin eliminates the need for separate control lines in compact designs.
What erase block sizes are available on the SST25WF020-40-5I-QAE, and are 64 KByte blocks supported?
The SST25WF020-40-5I-QAE supports uniform 4 KByte sectors and 32 KByte overlay blocks, as documented in Section "Memory Organization" and Table 10 of DS20005016C. Unlike the 4 Mbit SST25WF040 variant, the 2 Mbit SST25WF020-40-5I-QAE does not support 64 KByte blocks - that feature is explicitly reserved for 2 Mbit and 4 Mbit densities in the family datasheet, but Table 8 confirms 64 KByte block erase applies only to SST25WF040. Therefore, the SST25WF020-40-5I-QAE offers two granularities: precise 4 KByte updates for small patches and efficient 32 KByte erases for larger firmware segments.
Is the SST25WF020-40-5I-QAE still in production, and what is its lifecycle status?
The SST25WF020-40-5I-QAE is an obsolete (EOL) device, as indicated by the "EOL Data Sheet" header and "Obsolete Device" notice in DS20005016C. Microchip recommends contacting their sales organization for replacement guidance. While Aetrix Electronics maintains legacy inventory for continuity support, design-ins should consider qualified alternatives such as the SST26VF016B or newer Microchip Serial Quad Interface (SQI) flash families. The SST25WF020-40-5I-QAE remains fully functional and supported for existing production, but long-term availability cannot be guaranteed beyond current stock levels.
SST25WF020-40-5I-QAE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tube
- 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-WSON
SST25WF020-40-5I-QAE FAQ
1.How can I place an order for SST25WF020-40-5I-QAE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25WF020-40-5I-QAE 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-QAE reliable?
The price and inventory of SST25WF020-40-5I-QAE 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-QAE is usually 5 days.
3.What payment methods are accepted for SST25WF020-40-5I-QAE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25WF020-40-5I-QAE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25WF020-40-5I-QAE?
SST25WF020-40-5I-QAE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25WF020-40-5I-QAE 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-QAE?
For technical support, including SST25WF020-40-5I-QAE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25WF020-40-5I-QAE requirements.
6.How does Aetrix verify that SST25WF020-40-5I-QAE is sourced from the original manufacturer or authorized distributors?
All SST25WF020-40-5I-QAE 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-QAE meets industry standards.
7.What is the process for return or replacement of SST25WF020-40-5I-QAE?
All SST25WF020-40-5I-QAE units undergo pre-shipment inspection (PSI). If there is an issue with SST25WF020-40-5I-QAE, 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-QAE part is unused and in its original packaging.
Return procedure for SST25WF020-40-5I-QAE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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