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Microchip Technology SST25WF020AT-40I/NP
- Part No.:
- SST25WF020AT-40I/NP
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
SST25WF020AT-40I/NP.pdf
- Description:
- IC FLASH 2MBIT SPI 40MHZ 8USON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SST25WF020AT-40I/NP from Microchip Technology is a 2 Mbit (256 KByte), 1.8V SPI Serial Flash memory IC designed for embedded firmware storage and code execution in space-constrained industrial and IoT applications. It operates from 1.65–1.95V, supports 40 MHz high-speed read via SPI Mode 0/3, features uniform 4 KByte sectors and 64 KByte overlay blocks, and delivers ultra-low standby current of 4 µA in power-down mode.
For engineers reviewing the SST25WF020AT-40I/NP datasheet, SST25WF020AT-40I/NP pinout, SST25WF020AT-40I/NP application, or SST25WF020AT-40I/NP equivalent, key selection considerations include its 1.8V single-supply operation, 4 µA deep power-down current, hardware HOLD#/WP# pins for real-time command suspension and block-level write protection, and compatibility with standard SPI controllers requiring no voltage translation.
Technical Context
This SPI flash uses Microchip's proprietary SuperFlash technology with split-gate cell design and thick-oxide tunneling injector, enabling higher endurance (100,000 program/erase cycles) and >20-year data retention versus conventional NOR flash. Its dual-mode SPI interface (Mode 0 and Mode 3) ensures interoperability with diverse host controllers without clock polarity reconfiguration.
The device implements a dedicated status register with BUSY bit polling, WEL latch control, and non-volatile BP0/BP1/TB/BPL bits for flexible software-based memory protection. Hardware HOLD# allows pausing active serial sequences without deselecting CE#, while WP# enables lock-down of protection bits-critical for secure boot and firmware update integrity in industrial edge nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256 KByte) - sufficient for compact bootloader, configuration tables, and sensor calibration data in microcontroller-based systems. |
| Supply Voltage | 1.65–1.95 V - compatible with modern 1.8V I/O domains; eliminates need for level shifters in low-power SoC designs. |
| Max Clock Frequency | 40 MHz - enables high-speed instruction fetch and firmware updates; supported only by High-Speed Read (0BH) command. |
| Endurance | 100,000 program/erase cycles - suitable for field-updatable firmware with frequent minor revisions over product lifetime. |
| Data Retention | >20 years at +85°C - validated for long-term reliability in unattended industrial monitoring equipment. |
| Power-Down Current | 4 µA typical - minimizes system quiescent power in battery-backed or energy-harvesting applications. |
| Erase Granularity | Uniform 4 KByte sectors and 64 KByte overlay blocks - enables fine-grained firmware partitioning (e.g., separate app/boot regions) without wasted erase overhead. |
| Page Size | 256 bytes - aligns with common MCU cache line sizes and simplifies buffer management in HAL drivers. |
Pinout & Package
Package: 8-contact USON (2 mm × 3 mm), 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 full command sequence (e.g., Page-Program or Sector-Erase); drives device into Standby when high. |
| SO | Serial Data Output | Tri-state output; data shifted out on falling edge of SCK; enters high-impedance state during HOLD# or when CE# is high. |
| WP# | Write Protect | Hardware enable for status register lock-down (BPL bit); when low, prevents modification of BP0/BP1/TB unless BPL = 0. |
| VSS | Ground | Reference return path for all digital and analog circuitry; requires low-impedance connection to PCB ground plane. |
| VDD | Power Supply | 1.65–1.95 V supply input; bypass capacitor (≥1 µF ceramic) required within 5 mm for stable high-speed operation. |
| HOLD# | Hold | Pauses ongoing SPI transaction without resetting internal address pointer; valid only when CE# is low and SCK is low. |
| SCK | Serial Clock | Input timing reference; commands/data latched on rising edge; SO data valid on falling edge; supports Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). |
| SI | Serial Data Input | Command, address, and data input; sampled on rising edge of SCK; must be stable before clock rise time. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash® Technology | Split-gate cell architecture reduces program/erase current and time vs. standard NOR, cutting total energy per operation by up to 50%. |
| Hardware HOLD# Pin | Enables deterministic pause/resume of SPI transfers-essential for real-time systems where bus arbitration or interrupt servicing must preempt flash access. |
| Flexible Block Protection | Four non-volatile BP bits (BP0, BP1, TB, BPL) allow software-defined protection of top/bottom 1/4 or 1/2 memory blocks, preventing accidental overwrite of boot code. |
| Deep Power-Down Mode | 4 µA standby current with ABH release command; achieves lowest possible system sleep power without losing memory contents. |
| High-Speed Read (0BH) | 40 MHz operation with 1 dummy byte enables ~5 MB/s effective throughput-critical for XIP (execute-in-place) of firmware from flash. |
| Uniform Erase Architecture | Both 4 KByte sectors and 64 KByte overlay blocks support identical erase timing (40 ms / 80 ms), simplifying driver development and wear-leveling algorithms. |
Applications
| Industrial PLC Firmware Storage | IoT Edge Sensor Node Configuration |
|---|---|
Use Scenario: Storing and updating ladder logic firmware and I/O mapping tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Non-volatile code storage with fast read access for real-time execution and secure in-field updates via isolated CAN or Ethernet interfaces. Use Value: 100,000-cycle endurance and >20-year data retention ensure reliable operation across 15+ year PLC service life without maintenance. |
Use Scenario: Holding calibrated sensor coefficients, network credentials, and OTA update staging buffers in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Low-power configuration store accessed intermittently during wake-up cycles; leverages 4 µA deep power-down to extend battery life. Use Value: 1.8V single-supply operation eliminates level-shifting components, reducing BOM cost and PCB area in compact sensor modules. |
| Medical Diagnostic Device Bootloader | Smart Meter Firmware Partitioning |
Use Scenario: Hosting certified bootloader and secure boot manifest in portable ultrasound or glucose meters requiring regulatory-compliant firmware integrity. IC Role / Device Role / Timing Role: Trusted code execution anchor with hardware-enforced write protection (WP# + BPL) to prevent unauthorized modification of boot sequence. Use Value: Block-protection bits (BP0/BP1/TB) enable immutable separation between bootloader (protected bottom block) and application (updatable top block). |
Use Scenario: Storing tariff tables, encryption keys, and firmware images in ANSI C12.19-compliant smart electricity meters with remote update capability. IC Role / Device Role / Timing Role: Dual-role memory supporting both fast read (40 MHz High-Speed Read) for real-time metering and robust erase/program for secure OTA updates. Use Value: Uniform 4 KByte sector erase enables atomic update of individual tariff zones without disrupting active billing functions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI serial flash applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q20EW | 2 Mbit density, 1.7–1.95 V supply, 104 MHz Dual/Quad SPI; lacks HOLD# pin and deep power-down mode. | Better raw bandwidth but higher active current (8 mA typical); not drop-in due to missing HOLD# and different status register layout. | Select W25Q20EW only if system requires Dual/Quad SPI expansion and can accommodate revised driver logic and higher quiescent power. |
| Cypress S25FL032P | 32 Mbit density, 2.7–3.6 V supply, 85 MHz Quad SPI; includes SFDP and QPI modes; incompatible voltage range. | Higher capacity and faster interface, but requires 3.3V supply and level shifting-unsuitable for native 1.8V SoC integration. | Choose S25FL032P only when migrating to larger firmware footprints and 3.3V system architecture; not a functional substitute for SST25WF020AT-40I/NP in 1.8V designs. |
Compared with W25Q20EW and S25FL032P, the SST25WF020AT-40I/NP uniquely balances ultra-low 1.8V power consumption, hardware HOLD# for deterministic real-time control, and industrial-grade reliability-making it optimal for resource-constrained, battery-aware, or safety-critical 1.8V embedded systems where pin count and voltage compatibility are non-negotiable.
Availability
SST25WF020AT-40I/NP is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic devices, smart utility meters, and battery-powered IoT sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SST25WF020AT-40I/NP 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 Inc. is a leading provider of microcontrollers, analog components, and memory solutions, serving automotive, industrial, communications, and consumer markets with vertically integrated silicon and software.
The SST25WF020AT-40I/NP belongs to Microchip's Serial Flash 25 Series, engineered specifically for ultra-low-power, high-reliability embedded firmware storage in 1.8V systems where board space, energy efficiency, and long-term data integrity are critical design constraints.
FAQ
What is the operating voltage range of the SST25WF020AT-40I/NP?
The SST25WF020AT-40I/NP operates from 1.65 V to 1.95 V. This narrow 1.8V nominal range eliminates the need for external voltage translators when interfacing with 1.8V I/O microcontrollers or SoCs. Operation outside this window may cause undefined behavior or failure to execute commands such as Page-Program or Sector-Erase. The SST25WF020AT-40I/NP is not rated for 3.3V operation.
Does the SST25WF020AT-40I/NP support Quad SPI or Dual SPI modes?
No, the SST25WF020AT-40I/NP supports only standard single-data-line SPI (Mode 0 and Mode 3). It does not implement Quad SPI (QSPI), Dual SPI, or any multi-I/O protocol extensions. All communication uses SI (input) and SO (output) on separate pins, with no shared bidirectional data lines. This is confirmed in the official DS20005139F datasheet Section 4.0 and Table 5-1.
How does the HOLD# pin function during an active SPI transaction?
The HOLD# pin suspends an ongoing SPI sequence without resetting the internal address counter or deselecting the device. It activates when CE# is low and HOLD# transitions low coincident with SCK being low; SO enters high-impedance while SI and SCK remain active. Resuming requires HOLD# high while SCK is low, then continuing the transaction. This behavior is defined in DS20005139F Figure 4-2 and Section 4.0.1.
What is the maximum erase time for a 4 KByte sector on the SST25WF020AT-40I/NP?
The typical sector-erase time for a 4 KByte sector on the SST25WF020AT-40I/NP is 40 ms, with no specified maximum value in the datasheet. This timing applies under standard industrial conditions (–40°C to +85°C) and 1.8V supply. The device uses internal self-timed logic, so host software must poll the BUSY bit in the status register rather than rely on fixed delays. This is documented in DS20005139F page 1 and Table 5-1.
Can the SST25WF020AT-40I/NP be used in place of the SST25VF020B?
No-the SST25WF020AT-40I/NP is not a direct replacement for the SST25VF020B. The VF-series operates at 2.7–3.6 V and uses older floating-gate technology, while the WF-series is 1.65–1.95 V and based on SuperFlash. They differ in voltage range, endurance (100K vs. 10K cycles), data retention, and status register bit definitions. Interchangeability would require redesign of power delivery and firmware drivers.
SST25WF020AT-40I/NP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-UFDFN 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-USON (2x3)
SST25WF020AT-40I/NP FAQ
1.How can I place an order for SST25WF020AT-40I/NP through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25WF020AT-40I/NP 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/NP reliable?
The price and inventory of SST25WF020AT-40I/NP 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/NP is usually 5 days.
3.What payment methods are accepted for SST25WF020AT-40I/NP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25WF020AT-40I/NP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25WF020AT-40I/NP?
SST25WF020AT-40I/NP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25WF020AT-40I/NP 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/NP?
For technical support, including SST25WF020AT-40I/NP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25WF020AT-40I/NP requirements.
6.How does Aetrix verify that SST25WF020AT-40I/NP is sourced from the original manufacturer or authorized distributors?
All SST25WF020AT-40I/NP 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/NP meets industry standards.
7.What is the process for return or replacement of SST25WF020AT-40I/NP?
All SST25WF020AT-40I/NP units undergo pre-shipment inspection (PSI). If there is an issue with SST25WF020AT-40I/NP, 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/NP part is unused and in its original packaging.
Return procedure for SST25WF020AT-40I/NP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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