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Microchip Technology SST25WF020AT-40I/SN
- Part No.:
- SST25WF020AT-40I/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SST25WF020AT-40I/SN.pdf
- Description:
- IC FLASH 2MBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,074
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Product details
Overview
SST25WF020AT-40I/SN 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 implements SuperFlash technology for enhanced reliability, supports uniform 4 KByte sectors and 64 KByte overlay blocks, and is used in firmware storage, boot code execution, and configuration data retention for microcontroller-based embedded systems.
For engineers reviewing the SST25WF020AT-40I/SN datasheet, SST25WF020AT-40I/SN pinout, SST25WF020AT-40I/SN application, or SST25WF020AT-40I/SN equivalent, key selection criteria include SPI Mode 0/3 compatibility, ultra-low active/standby current (4 mA / 10 µA), hardware HOLD#/WP# control, 100,000 program/erase endurance, and 20+ year data retention - all verified for the exact SOIC-8 (150-mil) package variant denoted by the /SN suffix.
Technical Context
The SST25WF020AT-40I/SN uses proprietary SuperFlash split-gate cell architecture with thick-oxide tunneling injector, enabling faster erase times (sector: 40 ms typ., chip: 300 ms typ.) and lower total energy per write cycle versus conventional flash. Its serial interface operates at up to 40 MHz in High-Speed Read mode (0BH command with dummy byte) and supports dual-mode SPI timing (Mode 0 and Mode 3), with CE#-synchronized command framing and MSB-first data transfer.
Internal control logic includes a software status register with BUSY (bit 0), WEL (bit 1), and configurable block-protection bits (BP0/BP1/TB/BPL), managed via WREN/WRSR instructions. Hardware HOLD# suspends ongoing SPI sequences without deselecting the device, while WP# enables lock-down of protection bits when BPL = 1 - both functions validated for the /SN SOIC-8 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256 KByte), organized as 64 × 4 KByte sectors and four 64 KByte overlay blocks - defines firmware partitioning granularity and update flexibility. |
| Supply Voltage | 1.65–1.95 V - enables direct integration with 1.8 V I/O domains without level shifting, reducing BOM count and power rail complexity. |
| Max Clock Frequency | 40 MHz (High-Speed Read mode) - delivers ~4 MB/s sequential read throughput, sufficient for fast boot and real-time code shadowing. |
| Endurance & Retention | 100,000 program/erase cycles; >20 years data retention - ensures long-term reliability in field-deployed industrial controllers and medical devices. |
| Power Consumption | 4 mA typical active read current; 10 µA typical standby; 4 µA in deep power-down - extends battery life in always-on IoT edge nodes. |
| Erase/Program Speed | Sector-erase: 40 ms typ.; page-program (256 B): 3 ms typ. - reduces firmware update latency and improves over-the-air (OTA) deployment efficiency. |
| Operating Temperature | −40°C to +85°C (industrial grade) - qualified for use in automotive body electronics, industrial HMIs, and outdoor telecom equipment. |
Pinout & Package
Package: 8-lead SOIC (150 mils), surface-mount, RoHS-compliant - compatible with standard reflow profiles and automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command sequence; drives device into Standby mode when high. |
| SO | Serial Data Output | Tri-state output; data shifted out on falling SCK edge; enters high-impedance state during HOLD# or standby. |
| WP# | Write Protect | Hardware enable/disable of status register lock-down (BPL bit); low = BPL functional; high = BPL disabled. |
| VSS | Ground | Reference return path for all digital and analog circuitry; requires low-impedance PCB connection to minimize noise coupling. |
| VDD | Power Supply | 1.65–1.95 V supply input; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin for stable read/write operation. |
| HOLD# | Hold | Active-low suspend signal; pauses SPI communication without resetting clock phase; valid only when CE# is low. |
| SCK | Serial Clock | Input timing reference; rising edge latches SI data; falling edge clocks SO data; supports Mode 0 (idle low) and Mode 3 (idle high). |
| SI | Serial Data Input | Command/address/data input; sampled on rising SCK edge; MSB-first protocol applies to all instructions including RDSR and WRSR. |
Key Features
| Feature | Design Value |
|---|---|
| SuperFlash Technology | Split-gate cell with thick-oxide tunneling injector enables 40 ms sector-erase and 3 ms page-program - cuts firmware update time by >3× vs. standard NOR flash. |
| Flexible Block Protection | Software-configurable BP0/BP1/TB bits support 1/4 or 1/2 top/bottom memory block protection - allows secure bootloader + user-application partitioning. |
| Dual SPI Mode Support | Native compatibility with both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) - eliminates need for external SPI mode translation logic. |
| HOLD# Functionality | Hardware suspend without CE# toggle preserves SCK phase alignment - prevents bus contention in multi-master SPI systems. |
| Deep Power-Down Mode | 4 µA standby current with ABH release command - enables <1 µW system sleep states in battery-powered sensor nodes. |
Applications
| Firmware Storage | Boot Code Execution |
|---|---|
Use Scenario: Storing MCU firmware images, calibration tables, and device-specific configuration parameters in industrial PLCs. IC Role / Device Role / Timing Role: Non-volatile code storage with fast random-access read and atomic sector-level updates. Use Value: 40 MHz High-Speed Read enables sub-100 ms boot time; 100,000-cycle endurance supports field firmware upgrades over 10+ years. |
Use Scenario: Hosting boot ROM for ARM Cortex-M microcontrollers in medical diagnostic equipment. IC Role / Device Role / Timing Role: XIP-capable SPI flash providing instruction fetch directly to CPU cache via memory-mapped interface. Use Value: Uniform 4 KByte sectors allow safe in-field bootloader replacement without corrupting active application code. |
| Configuration Data Retention | Secure Device Identity |
Use Scenario: Saving network credentials, encryption keys, and user preferences in smart home gateways. IC Role / Device Role / Timing Role: Low-power persistent storage with hardware write-protection (WP# + BPL) to prevent accidental overwrite. Use Value: 4 µA deep power-down current extends battery backup life to >5 years; software block-protection prevents unauthorized key erasure. |
Use Scenario: Providing unique device identification and manufacturer traceability in automotive telematics modules. IC Role / Device Role / Timing Role: JEDEC ID (9FH) and Read-ID (ABH) support secure provisioning and anti-counterfeiting verification. Use Value: Factory-programmed 32-bit JEDEC ID and 24-bit device ID enable cryptographic binding to hardware root-of-trust during manufacturing. |
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, 1.7–2.0 V supply, 104 MHz Dual/Quad SPI; no HOLD# pin; different status register map. | Requires Quad-SPI host controller; lacks hardware HOLD# for multi-master arbitration; higher speed but incompatible command set. | Select only if migrating to QSPI interface and redesigning driver firmware; not drop-in compatible. |
| Cypress S25FL004A | 4 Mbit density, 2.7–3.6 V supply, 50 MHz SPI; supports SFDP; different sector layout (64 × 64 KB). | Higher voltage incompatible with 1.8 V systems; double density increases cost and footprint; SFDP simplifies initialization but adds overhead. | Use only in 3.3 V designs requiring larger capacity; requires voltage translation and layout changes for SST25WF020AT-40I/SN replacement. |
Compared with Winbond W25Q20EW and Cypress S25FL004A, the SST25WF020AT-40I/SN offers optimal fit for 1.8 V, space-constrained industrial controllers needing hardware HOLD#, deterministic 40 MHz timing, and proven 20-year data retention - without requiring QSPI migration or voltage translation.
Availability
SST25WF020AT-40I/SN is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and automotive body electronics requiring stable component supply, long-lifecycle support, and guaranteed RoHS compliance.
Supply support for SST25WF020AT-40I/SN 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 global semiconductor company specializing in microcontrollers, analog components, and memory solutions, with emphasis on reliability, longevity, and embedded system integration.
The SST25WF020AT-40I/SN belongs to Microchip's Serial Flash 25 Series, designed specifically for low-voltage, low-power embedded applications where firmware integrity, fast boot performance, and industrial-grade environmental resilience are critical.
FAQ
What is the exact package type and lead count for SST25WF020AT-40I/SN?
The SST25WF020AT-40I/SN is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with 150-mil body width. This package is surface-mount, RoHS-compliant, and matches the pinout shown in Figure 2-1 of the DS20005139F datasheet - confirming CE#, SO, WP#, VSS, VDD, HOLD#, SCK, and SI assignments. The "/SN" suffix explicitly denotes the SOIC-8 variant.
Does SST25WF020AT-40I/SN support both SPI Mode 0 and Mode 3, and how is this implemented?
Yes, the SST25WF020AT-40I/SN natively supports both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), as confirmed in Section 4.0 of the datasheet. The device samples SI on the rising edge and drives SO on the falling edge of SCK in both modes; the only difference is SCK idle state (low in Mode 0, high in Mode 3), allowing seamless integration with diverse host controllers without protocol translation.
What is the maximum clock frequency for read operations on SST25WF020AT-40I/SN, and which command enables it?
The SST25WF020AT-40I/SN supports up to 40 MHz for High-Speed Read operations using the 0BH command (with one dummy byte), as specified in Table 5-1 and Figure 5-2 of the datasheet. Standard Read (03H) is limited to 25 MHz. The 40 MHz capability enables sustained read throughput of approximately 4 MB/s, critical for fast boot and real-time code loading.
How does hardware write protection work on SST25WF020AT-40I/SN, and what role does the WP# pin play?
On the SST25WF020AT-40I/SN, the WP# pin controls the Block-Protection Lock-Down (BPL) bit in the status register. When WP# is low, BPL becomes functional: if BPL = 1, BP0/BP1/TB bits become read-only, preventing further modification of memory protection settings. When WP# is high, BPL is disabled and all protection bits remain writable - enabling flexible, field-updatable security policies.
What are the erase granularities supported by SST25WF020AT-40I/SN, and how do they map to memory organization?
The SST25WF020AT-40I/SN supports three erase granularities: 4 KByte sectors (64 total), 64 KByte overlay blocks (four), and full-chip erase. Memory is organized as 000000H–03FFFFH (2 Mbit), with sector addresses aligned to 4 KByte boundaries (e.g., 000000H, 001000H) and block addresses aligned to 64 KByte boundaries (e.g., 000000H, 010000H). This structure enables precise firmware partitioning and atomic updates.
SST25WF020AT-40I/SN 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:
- Active
- 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:
- 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-SOIC
SST25WF020AT-40I/SN FAQ
1.How can I place an order for SST25WF020AT-40I/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25WF020AT-40I/SN 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/SN reliable?
The price and inventory of SST25WF020AT-40I/SN 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/SN is usually 5 days.
3.What payment methods are accepted for SST25WF020AT-40I/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25WF020AT-40I/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25WF020AT-40I/SN?
SST25WF020AT-40I/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25WF020AT-40I/SN 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/SN?
For technical support, including SST25WF020AT-40I/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25WF020AT-40I/SN requirements.
6.How does Aetrix verify that SST25WF020AT-40I/SN is sourced from the original manufacturer or authorized distributors?
All SST25WF020AT-40I/SN 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/SN meets industry standards.
7.What is the process for return or replacement of SST25WF020AT-40I/SN?
All SST25WF020AT-40I/SN units undergo pre-shipment inspection (PSI). If there is an issue with SST25WF020AT-40I/SN, 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/SN part is unused and in its original packaging.
Return procedure for SST25WF020AT-40I/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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