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Microchip Technology SST25VF020-20-4C-QAE
- Part No.:
- SST25VF020-20-4C-QAE
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
SST25VF020-20-4C-QAE.pdf
- Description:
- IC FLASH 2MBIT SPI 20MHZ 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,657
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Product details
Overview
SST25VF020-20-4C-QAE from Microchip Technology is a 2 Mbit SPI serial flash memory IC designed for embedded firmware storage, boot code retention, and configuration data in space-constrained systems. It operates at 2.7–3.6 V, supports 20 MHz SPI clock (Mode 0/3), delivers 100,000 program/erase cycles, and guarantees >100 years data retention - deployed in industrial control panels and IoT edge nodes requiring reliable nonvolatile storage.
For engineers reviewing the SST25VF020-20-4C-QAE datasheet, SST25VF020-20-4C-QAE pinout, SST25VF020-20-4C-QAE application, or SST25VF020-20-4C-QAE equivalent, key selection criteria include its 8-pin SOIC package, hardware HOLD#/WP# pins for real-time bus suspension and sector-level write protection, AAI programming mode for accelerated sequential writes, and compatibility with legacy SPI host controllers requiring no protocol translation.
Technical Context
This SPI flash uses SST's proprietary SuperFlash technology with split-gate cells and thick-oxide tunneling injectors, enabling faster erase (sector: 18 ms typ.) and lower total energy per operation versus conventional NOR flash. Its command set includes dedicated opcodes for sector/block/chip erase (20H/52H/60H), byte-program (02H), AAI program (AFH), and status register access (05H/01H).
The device implements dual software/hardware write protection: Block-Protection bits (BP1/BP0) in the status register define protected memory regions (0–100% of 2 Mbit array), while WP# physically enables/disables BPL lock-down functionality. HOLD# suspends ongoing SPI transactions without deselecting CE#, preserving internal address state across pauses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 bytes), organized as 64 uniform 4 KByte sectors or 8 overlay 32 KByte blocks |
| Supply Voltage | 2.7–3.6 V single supply - compatible with 3.3 V logic domains without level shifting |
| Max SPI Clock | 20 MHz - supports high-throughput firmware updates and boot loading in resource-limited MCUs |
| Endurance | 100,000 program/erase cycles - sufficient for field-upgradable firmware with infrequent rewrites |
| Data Retention | >100 years at +25°C - ensures long-term reliability in unattended industrial deployments |
| Active Read Current | 7 mA typical - minimizes power draw during boot code fetch and runtime configuration reads |
| Standby Current | 8 µA typical - enables ultra-low-power sleep modes in battery-powered devices |
| Operating Temp | 0°C to +70°C (Commercial grade) - validated for use in office equipment and consumer electronics |
Pinout & Package
Package: 8-lead SOIC, 150 mil body width (SA suffix), RoHS-compliant, lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low chip select; must remain low throughout SPI command sequences to maintain device engagement |
| SO | Serial Data Output | Tri-state output; drives data on falling SCK edge; enters high-impedance during HOLD# assertion |
| WP# | Write Protect | Hardware enable for status register lock-down (BPL); when low, BP1/BP0 become read-only if BPL=1 |
| VSS | Ground | Reference return path for all digital and analog circuitry; requires low-impedance PCB connection |
| VDD | Power Supply | 2.7–3.6 V input; decoupling capacitor (0.1 µF) required near pin for stable read/write timing |
| HOLD# | Hold Control | Suspends active SPI transfer without resetting internal address pointer; resumes on rising edge synchronized to SCK low |
| SCK | Serial Clock | Master-generated timing signal; latches SI on rising edge, shifts SO on falling edge; supports Mode 0/3 polarity |
| SI | Serial Data Input | Command/address/data input; sampled on rising SCK edge; MSB-first protocol alignment |
Key Features
| Feature | Design Value |
|---|---|
| Auto Address Increment (AAI) | Reduces sequential byte-program time by eliminating repeated address transmission - critical for fast firmware patching |
| Flexible Erase Granularity | Independent 4 KByte sector and 32 KByte block erase - enables targeted updates without full chip erase overhead |
| Dual Write Protection | Combines hardware WP# pin control with software-configurable BP1/BP0 bits - prevents accidental corruption of bootloader or calibration data |
| HOLD# Functionality | Pauses SPI communication mid-transfer without losing context - essential for multi-master arbitration or interrupt-driven host systems |
| SuperFlash Technology | Split-gate cell architecture lowers program/erase voltage stress and improves endurance/reliability over standard NOR flash |
| Industrial Temperature Option | Available in -40°C to +85°C variant (QAE suffix denotes Commercial; QAI would indicate Industrial) |
Applications
| Firmware Storage | Configuration Data Retention |
|---|---|
Use Scenario: Storing boot loader and application firmware for ARM Cortex-M microcontrollers in medical diagnostic instruments. IC Role / Device Role / Timing Role: Nonvolatile code storage accessed during cold start; provides deterministic 20 MHz SPI read latency for fast system initialization. Use Value: 100-year data retention ensures firmware integrity across instrument lifetime without maintenance; 4 KByte sector erase allows safe field updates without risking bootloader region. | Use Scenario: Holding calibration coefficients and user preferences in HVAC controller modules operating in commercial buildings. IC Role / Device Role / Timing Role: Persistent parameter storage updated infrequently via MCU SPI interface; withstands 100,000 write cycles over 10+ years of service. Use Value: Hardware WP# and software BP bits prevent accidental overwrite during power glitches or firmware bugs - maintaining regulatory compliance and operational safety. |
| BIOS/UEFI Code Storage | IoT Edge Node Configuration |
Use Scenario: Embedded x86 platform BIOS storage in industrial HMIs where firmware integrity is mission-critical. IC Role / Device Role / Timing Role: SPI-connected boot memory mapped via chipset; supports fast read speeds and secure write-protection lockdown. Use Value: BPL bit lock-down via WP# prevents unauthorized modification of boot code - meeting IEC 62443 security requirements for industrial automation. | Use Scenario: Storing network credentials, sensor calibration, and OTA update metadata in battery-powered smart meters. IC Role / Device Role / Timing Role: Low-power nonvolatile storage interfaced to ultra-low-power MCU; leverages 8 µA standby current for multi-year battery life. Use Value: AAI programming accelerates secure firmware updates over constrained LPWAN links - reducing radio-on time and energy consumption. |
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 W25X20CL | 2 Mbit density, 3.3 V, 20 MHz max clock, same SOIC-8 package; lacks HOLD# pin and AAI programming mode | Requires host-side polling instead of hardware hold; no accelerated sequential write capability | Select when HOLD# and AAI are unused and cost sensitivity outweighs feature parity |
| Macronix MX25L2006E | 2 Mbit density, 3.3 V, 20 MHz max clock, SOIC-8; supports HOLD# and standard SPI commands but no AAI mode | Compatible pinout and basic instruction set; missing AAI reduces sequential write throughput by ~30% | Choose for drop-in replacement where existing firmware does not leverage AAI and HOLD# usage is minimal |
Compared with SST25VF020-20-4C-QAE, W25X20CL omits HOLD# and AAI - limiting real-time bus arbitration and slowing bulk writes; MX25L2006E retains HOLD# but lacks AAI, resulting in longer firmware update durations. SST25VF020-20-4C-QAE remains optimal where both features are leveraged in production firmware.
Availability
SST25VF020-20-4C-QAE is available at Aetrix Electronics and suitable for industrial HMIs, medical diagnostics, smart metering, and consumer electronics requiring stable component supply and long-term obsolescence management.
Supply support for SST25VF020-20-4C-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 is a global provider of microcontrollers, analog, FPGA, and memory solutions, acquired Silicon Storage Technology (SST) in 2010 to expand its serial flash portfolio.
The SST25VF020-20-4C-QAE belongs to SST's legacy SuperFlash serial flash product line, engineered for cost-sensitive, space-constrained embedded systems needing robust nonvolatile storage with hardware-assisted reliability features.
FAQ
What is the maximum SPI clock frequency supported by the SST25VF020-20-4C-QAE?
The SST25VF020-20-4C-QAE supports a maximum SPI clock frequency of 20 MHz, as specified in the DS25078A datasheet. This timing applies to both Mode 0 and Mode 3 SPI configurations and enables high-speed read operations for boot code execution and firmware updates. The device maintains timing compliance across its full 2.7–3.6 V supply range and commercial temperature grade (0°C to +70°C). Exceeding 20 MHz may result in command rejection or data corruption.
Does the SST25VF020-20-4C-QAE support hardware write protection via the WP# pin?
Yes, the SST25VF020-20-4C-QAE uses the WP# pin to enable hardware-controlled lock-down of the Block-Protection-Lock (BPL) bit in the status register. When WP# is driven low, the BPL bit determines whether BP1/BP0 can be modified. If BPL = 1, those bits become read-only - preventing accidental changes to memory protection settings. This complements software-based BP bits to deliver dual-layer write security for critical firmware regions.
What erase granularities are available on the SST25VF020-20-4C-QAE?
The SST25VF020-20-4C-QAE offers two independent erase granularities: uniform 4 KByte sectors and uniform 32 KByte overlay blocks. Sector erase (opcode 20H) clears one 4 KByte region; block erase (52H) clears one 32 KByte region. Both operations are self-timed (18 ms typical) and respect software/hardware write protection. Chip erase (60H) clears the full 2 Mbit array only when no protection bits are active.
How does the HOLD# pin function during an active SPI transaction on the SST25VF020-20-4C-QAE?
The HOLD# pin on the SST25VF020-20-4C-QAE suspends an ongoing SPI sequence without deselecting the device or resetting the internal address pointer. Activation requires CE# to be low and HOLD# to fall coincident with SCK low; release occurs on HOLD# rise aligned to next SCK low. During hold, SO enters high-impedance while SI/SCK remain valid - enabling multi-master arbitration or host interrupt handling without transaction loss.
Is the SST25VF020-20-4C-QAE recommended for new designs?
No - the SST25VF020-20-4C-QAE is marked "Not Recommended for New Designs" in the official DS25078A datasheet. Microchip recommends migrating to the pin-compatible SST25VF020B, which offers enhanced reliability, extended temperature support, and improved ESD performance. While SST25VF020-20-4C-QAE remains available for legacy production and repair, new designs should evaluate SST25VF020B or modern alternatives like SST26VF016B for long-term supply assurance.
SST25VF020-20-4C-QAE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON
SST25VF020-20-4C-QAE FAQ
1.How can I place an order for SST25VF020-20-4C-QAE through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25VF020-20-4C-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 SST25VF020-20-4C-QAE reliable?
The price and inventory of SST25VF020-20-4C-QAE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25VF020-20-4C-QAE is usually 5 days.
3.What payment methods are accepted for SST25VF020-20-4C-QAE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25VF020-20-4C-QAE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25VF020-20-4C-QAE?
SST25VF020-20-4C-QAE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25VF020-20-4C-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 SST25VF020-20-4C-QAE?
For technical support, including SST25VF020-20-4C-QAE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25VF020-20-4C-QAE requirements.
6.How does Aetrix verify that SST25VF020-20-4C-QAE is sourced from the original manufacturer or authorized distributors?
All SST25VF020-20-4C-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 SST25VF020-20-4C-QAE meets industry standards.
7.What is the process for return or replacement of SST25VF020-20-4C-QAE?
All SST25VF020-20-4C-QAE units undergo pre-shipment inspection (PSI). If there is an issue with SST25VF020-20-4C-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 SST25VF020-20-4C-QAE part is unused and in its original packaging.
Return procedure for SST25VF020-20-4C-QAE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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