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Microchip Technology SST25VF020-20-4I-QAE-T
- Part No.:
- SST25VF020-20-4I-QAE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
SST25VF020-20-4I-QAE-T.pdf
- Description:
- IC FLASH 2MBIT SPI 20MHZ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,804
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Product details
Overview
SST25VF020-20-4I-QAE-T from Microchip Technology is a 2 Mbit SPI serial flash memory IC designed for embedded firmware storage and configuration data retention in microcontroller-based systems. It operates from a single 2.7–3.6 V supply, supports up to 20 MHz SPI clock (Mode 0/3), delivers 100,000 program/erase cycles, and guarantees >100 years data retention - deployed in industrial control panels requiring nonvolatile code storage with sector-level write protection.
For engineers reviewing the SST25VF020-20-4I-QAE-T datasheet, SST25VF020-20-4I-QAE-T pinout, SST25VF020-20-4I-QAE-T application, or SST25VF020-20-4I-QAE-T equivalent, key selection criteria include its 8-lead SOIC package, hardware HOLD#/WP# pins for real-time bus suspension and block protection, AAI programming mode for accelerated sequential writes, and compatibility with legacy SPI host controllers requiring deterministic erase timing (sector: 18 ms typ, chip: 70 ms typ).
Technical Context
The SST25VF020-20-4I-QAE-T implements a four-wire SPI interface with dual-mode support (Mode 0 and Mode 3), enabling interoperability with diverse host MCUs without protocol translation. Its SuperFlash technology uses a split-gate cell and thick-oxide tunneling injector to achieve lower program current (7 mA typical active read) and faster erase times versus conventional NOR flash.
Internal architecture includes a software status register with BUSY/WEL/BP0/BP1/BPL/AAI bits, supporting flexible protection schemes (full, half, quarter, or none of 2 Mbit array), auto-address increment programming, and end-of-write detection via polling. The HOLD# pin suspends ongoing SPI transfers without deselecting CE#, preserving internal state across transient host interruptions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 bytes), organized as 64 uniform 4 KByte sectors or eight 32 KByte overlay blocks - enables granular firmware updates without full chip erase. |
| Supply Voltage | 2.7–3.6 V single supply - compatible with 3.3 V logic domains and eliminates need for level shifters in most MCU interfaces. |
| Max SPI Clock | 20 MHz - supports high-throughput boot code loading and parameter logging at up to ~2.5 MB/s effective throughput (with overhead). |
| Endurance | 100,000 program/erase cycles (typical) - sufficient for field-upgradable firmware with frequent minor revisions over 10+ year product life. |
| Data Retention | >100 years at +25°C - ensures long-term reliability for unattended industrial equipment storing calibration or event logs. |
| Erase Time | Sector-erase: 18 ms typ; Chip-erase: 70 ms typ - predictable timing simplifies host firmware timeout handling and reduces system latency during updates. |
| Active Current | 7 mA typical during read - low power draw extends battery life in portable diagnostic tools using this flash for configuration storage. |
| Standby Current | 8 µA typical - enables ultra-low-power sleep modes in always-on IoT edge nodes where flash remains powered but idle. |
Pinout & Package
Package: 8-lead SOIC, 150 mil body width (SA suffix), RoHS-compliant, industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command sequence - enables multi-device SPI daisy-chaining with dedicated chip select lines. |
| SCK | Serial Clock | Timing reference for all SPI transfers; rising edge latches input (SI), falling edge outputs data (SO) - supports both Mode 0 (SCK idle low) and Mode 3 (SCK idle high). |
| SI | Serial Data Input | Command, address, and data input path; MSB-first, synchronous to SCK rising edge - accepts standard SPI opcodes (03H Read, 02H Byte-Program, 20H Sector-Erase, etc.). |
| SO | Serial Data Output | Read data and status register output; driven on SCK falling edge - high-impedance when HOLD# is asserted, allowing bus sharing without contention. |
| WP# | Write Protect | Hardware lock-down control for Block-Protection-Lock (BPL) bit; low = BPL enabled, preventing accidental status register modification - critical for certified firmware integrity in medical devices. |
| HOLD# | Hold | Suspends ongoing SPI transaction without resetting internal address pointer or state machine - preserves context during host interrupt servicing or DMA arbitration delays. |
| VDD | Power Supply | 2.7–3.6 V core supply; decoupling capacitor required near pin to suppress switching noise during program/erase pulses. |
| VSS | Ground | Reference return path for all I/O and core circuitry; must be low-impedance connection to minimize ground bounce during high-current erase operations. |
Key Features
| Feature | Design Value |
|---|---|
| Auto Address Increment (AAI) Programming | Reduces total programming time for sequential data by eliminating repeated address transmission - ideal for writing contiguous firmware images without host-side address management overhead. |
| Flexible Block Protection | Software-configurable BP0/BP1 bits enable selective write protection of full, half, quarter, or zero memory regions - supports secure bootloader partitioning and field-upgradeable application sections. |
| HOLD# Pin Functionality | Pauses SPI communication mid-transfer while retaining internal state - eliminates need for reinitialization after host interrupts, improving real-time determinism in motor control applications. |
| SuperFlash Technology | Split-gate cell architecture lowers program current and shortens erase time versus standard NOR flash - reduces total energy per operation and thermal stress during frequent updates. |
| Industrial Temperature Range | Rated for –40°C to +85°C operation - validated for deployment in outdoor automation gateways, factory-floor HMIs, and transportation electronics exposed to wide ambient swings. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing ladder logic programs and I/O mapping tables in programmable logic controllers operating in factory environments with voltage transients and temperature cycling. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast sector erase for incremental firmware patches; WP# pin hardwired to prevent runtime corruption during brown-out events. Use Value: 100,000-cycle endurance ensures 10+ years of daily update cycles; 18 ms sector erase enables sub-second firmware rollback without halting production line control. | Use Scenario: Holding calibrated sensor offsets, user preferences, and audit logs in portable ultrasound machines requiring FDA-compliant data integrity and traceability. IC Role / Device Role / Timing Role: Secure configuration store with BPL-enabled status register lock-down; HOLD# used to freeze flash access during ECG signal acquisition bursts. Use Value: >100-year data retention meets regulatory archival requirements; software block protection prevents unauthorized overwrite of calibration constants during service mode. |
| Automotive Telematics Bootloader | Smart Energy Meter Firmware |
Use Scenario: Hosting secure bootloader code in vehicle telematics units that perform OTA updates over cellular networks under varying power conditions. IC Role / Device Role / Timing Role: Dual-mode SPI (Mode 0/3) compatibility with multiple SoC platforms; AAI programming accelerates signed firmware image writes post-authentication. Use Value: 20 MHz max clock enables rapid boot code verification; chip-erase time of 70 ms typ allows full recovery from corrupted images within strict automotive boot-time budgets. | Use Scenario: Storing tariff tables, metering algorithms, and tamper-event logs in ANSI C12.22-compliant smart electricity meters deployed in utility substations. IC Role / Device Role / Timing Role: Industrial-temp-rated nonvolatile memory with hardware WP# tied to meter security controller; sector erase isolates firmware updates from revenue-critical data partitions. Use Value: 8 µA standby current minimizes battery drain during mains failure; uniform 4 KByte sectors align with ANSI-defined firmware update block sizes for certification compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q20BV | 2 Mbit density, 104 MHz max clock, Quad SPI support, 100k endurance, same SOIC-8 package | Supports QPI mode for higher bandwidth; lacks HOLD# pin; different status register layout and protection scheme | Choose for bandwidth-sensitive designs needing faster reads; verify host driver compatibility with W25Q20BV's extended instruction set and absence of HOLD#. |
| Micron MT25QL02G | 256 Mbit density (128× larger), 133 MHz max clock, Quad/Dual SPI, 100k endurance, SOIC-8 pin-compatible but functionally supersets | Requires density scaling and instruction set adaptation; supports SFDP for auto-configuration; no direct HOLD# equivalent | Consider only if future-proofing for larger firmware; requires PCB redesign for voltage tolerance (1.7–2.0 V or 2.7–3.6 V options) and firmware abstraction layer updates. |
Compared with SST25VF020-20-4I-QAE-T, W25Q20BV offers higher speed but removes HOLD# functionality critical for deterministic interrupt handling, while MT25QL02G provides massive density headroom at the cost of increased complexity, voltage constraints, and loss of pin-level compatibility for hold/resume use cases.
Availability
SST25VF020-20-4I-QAE-T is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and automotive telematics modules requiring stable component supply and long-term lifecycle support.
Supply support for SST25VF020-20-4I-QAE-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 is a global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with deep expertise in embedded control and secure connectivity.
The SST25VF020-20-4I-QAE-T belongs to Microchip's legacy SST serial flash product line, engineered for cost-sensitive, reliability-critical embedded applications where deterministic SPI timing, low-power operation, and hardware-assisted write protection are prioritized over raw bandwidth or density scalability.
FAQ
What is the maximum SPI clock frequency supported by the SST25VF020-20-4I-QAE-T?
The SST25VF020-20-4I-QAE-T supports a maximum SPI clock frequency of 20 MHz, as specified in the DS25078A datasheet. This applies to both Mode 0 and Mode 3 SPI operation. At this rate, the device achieves reliable read throughput with standard setup/hold timing margins, making it suitable for real-time firmware loading in resource-constrained microcontroller systems. The SST25VF020-20-4I-QAE-T does not support Quad SPI or higher-speed protocols.
Does the SST25VF020-20-4I-QAE-T support hardware write protection via the WP# pin?
Yes, the SST25VF020-20-4I-QAE-T uses the WP# pin to enable hardware lock-down of the Block-Protection-Lock (BPL) bit in the status register. When WP# is driven low, the BPL bit becomes effective, preventing further changes to BP1, BP0, and BPL itself - ensuring immutable protection settings after initial configuration. This feature is documented in Table 2 of the DS25078A datasheet and is fully implemented in the SST25VF020-20-4I-QAE-T.
What package type is used for the SST25VF020-20-4I-QAE-T?
The SST25VF020-20-4I-QAE-T is packaged in an 8-lead SOIC with 150 mil body width (SA package), RoHS-compliant and rated for industrial temperature range (–40°C to +85°C). This package matches standard PCB footprints for legacy SPI flash devices and supports automated assembly. The "QAE-T" suffix confirms the SOIC-8 industrial-grade variant, distinct from WSON or commercial-temp versions.
How does the HOLD# pin function on the SST25VF020-20-4I-QAE-T during SPI communication?
The HOLD# pin on the SST25VF020-20-4I-QAE-T suspends ongoing SPI transactions without deselecting the device or resetting internal state. When asserted (low) while CE# is active, it places SO in high-impedance and freezes the address counter - allowing the host to service interrupts or manage bus arbitration, then resume exactly where it left off. This behavior is electrically defined in Figure 4 and described in Section 6 of the DS25078A datasheet for the SST25VF020-20-4I-QAE-T.
Is the SST25VF020-20-4I-QAE-T recommended for new designs?
No, the SST25VF020-20-4I-QAE-T is marked "Not Recommended for New Designs" in the official DS25078A datasheet. Microchip recommends migrating to the SST25VF020B for new projects, which offers enhanced reliability and updated manufacturing process. However, the SST25VF020-20-4I-QAE-T remains fully supported for existing designs, with guaranteed supply continuity and identical pinout/functionality to the original SST25VF020 family.
SST25VF020-20-4I-QAE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-WDFN 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:
- 20 MHz
- Write Cycle Time - Word, Page:
- 20µs
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON
SST25VF020-20-4I-QAE-T FAQ
1.How can I place an order for SST25VF020-20-4I-QAE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25VF020-20-4I-QAE-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 SST25VF020-20-4I-QAE-T reliable?
The price and inventory of SST25VF020-20-4I-QAE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25VF020-20-4I-QAE-T is usually 5 days.
3.What payment methods are accepted for SST25VF020-20-4I-QAE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25VF020-20-4I-QAE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25VF020-20-4I-QAE-T?
SST25VF020-20-4I-QAE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25VF020-20-4I-QAE-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 SST25VF020-20-4I-QAE-T?
For technical support, including SST25VF020-20-4I-QAE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25VF020-20-4I-QAE-T requirements.
6.How does Aetrix verify that SST25VF020-20-4I-QAE-T is sourced from the original manufacturer or authorized distributors?
All SST25VF020-20-4I-QAE-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 SST25VF020-20-4I-QAE-T meets industry standards.
7.What is the process for return or replacement of SST25VF020-20-4I-QAE-T?
All SST25VF020-20-4I-QAE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST25VF020-20-4I-QAE-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 SST25VF020-20-4I-QAE-T part is unused and in its original packaging.
Return procedure for SST25VF020-20-4I-QAE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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