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Microchip Technology SST25WF512-40-5I-SAF
- Part No.:
- SST25WF512-40-5I-SAF
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SST25WF512-40-5I-SAF.pdf
- Description:
- IC FLASH 512KBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,520
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Product details
Overview
SST25WF512-40-5I-SAF from Microchip Technology is a 512 Kbit (64 KB) SPI serial flash memory IC operating at 1.65–1.95 V, supporting 40 MHz high-speed read via SPI Mode 0/3, with uniform 4 KByte sector erase and Auto Address Increment (AAI) programming. It delivers 100,000 program/erase cycles and >100-year data retention for firmware storage in space-constrained industrial microcontroller boot applications.
For engineers reviewing the SST25WF512-40-5I-SAF datasheet, SST25WF512-40-5I-SAF pinout, SST25WF512-40-5I-SAF application, or SST25WF512-40-5I-SAF equivalent, key selection criteria include its 1.8V single-supply operation, SOIC-8 package compatibility, hardware reset vs. hold pin flexibility, software write protection granularity, and AAI programming efficiency for sequential firmware updates.
Technical Context
This device implements a four-wire SPI interface (SCK, SI, SO, CE#) with dual-mode clocking (Mode 0 and Mode 3), enabling interoperability with diverse host controllers. Its SuperFlash technology uses a split-gate cell and thick-oxide tunneling injector to achieve superior endurance and lower total energy per erase/program cycle versus conventional flash.
It integrates a software status register with BUSY/WEL/BP/BPL bits, supports both hardware reset (RST#) and suspend-on-hold (HOLD#) functionality via a shared pin, and provides three erasable block granularities - though only 4 KByte sectors apply to the 512 Kbit density. Write protection is enforced via BP0–BP2 bits and WP#-enabled lock-down of BPL.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 512 Kbit (64 KB) - fixed capacity for compact boot code or configuration storage |
| Supply Voltage | 1.65–1.95 V - enables direct interfacing with 1.8V logic without level shifting |
| Max Clock Frequency | 40 MHz - supports high-speed read via High-Speed Read (0BH) instruction with dummy byte |
| Endurance | 100,000 program/erase cycles - sufficient for field firmware updates over product lifetime |
| Data Retention | >100 years - ensures long-term reliability in unpowered storage scenarios |
| Erase Granularity | Uniform 4 KByte sectors only - no 32/64 KByte blocks (not supported in 512 Kbit variant) |
| Active Read Current | 2 mA typical @ 20 MHz - low power draw during active firmware fetch operations |
| Standby Current | 2 µA typical - minimal quiescent consumption in sleep or idle states |
Pinout & Package
Package: 8-lead SOIC (150 mils), 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 command sequence to prevent premature termination |
| SO | Serial Data Output / RY/BY# | Outputs read data on falling SCK edge; functions as ready/busy status pin during AAI mode when configured |
| WP# | Write Protect Input | Enables lock-down of Block-Protection-Lock (BPL) bit; disables WRSR execution when low and BPL=1 |
| VSS | Ground | Reference return path for all I/O and core circuitry; requires low-impedance PCB connection |
| VDD | Power Supply | 1.65–1.95 V supply input; decoupling capacitor required near pin for noise suppression |
| RST#/HOLD# | Reset or Hold Control | Default hardware reset (RST#); configurable to suspend SPI communication (HOLD#) via EHLD instruction |
| SCK | Serial Clock | Timing reference for SPI transfers; sampled on rising edge for inputs, drives outputs on falling edge |
| SI | Serial Data Input | Accepts commands, addresses, and data; latched on rising edge of SCK |
Key Features
| Feature | Design Value |
|---|---|
| Auto Address Increment (AAI) Programming | Reduces total programming time for sequential writes by eliminating repeated address transmission per byte |
| Flexible Write Protection | Software-configurable BP0–BP2 bits protect full, upper-half, or upper-quarter memory; lock-down enabled via WP# |
| Dual SPI Modes (0 and 3) | Ensures compatibility with host controllers using either idle-low or idle-high clock polarity conventions |
| End-of-Write Detection | Hardware-ready/busy status on SO pin or software polling of BUSY bit in status register |
| Low-Power Operation | 2 µA standby current minimizes system-level power budget impact during inactive periods |
| SuperFlash Technology | Split-gate cell architecture delivers higher reliability and faster erase times than standard NOR flash |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing bootloader and calibration parameters in DIN-rail mounted programmable logic controllers exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Non-volatile configuration and firmware image storage with guaranteed data integrity across –40°C to +85°C. Use Value: 100,000-cycle endurance supports field firmware updates; 100-year retention prevents data loss during extended shelf life or maintenance intervals. |
Use Scenario: Holding device-specific calibration coefficients and safety-critical startup sequences in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, low-power boot memory ensuring deterministic initialization before main processor activation. Use Value: WP#-enabled lock-down prevents accidental overwrite of calibrated values; 2 µA standby current extends battery runtime between charges. |
| Smart Energy Meter Boot Code | Automotive Body Control Module (BCM) Settings |
Use Scenario: Hosting secure boot loader and metering algorithm binaries in ANSI C12.22-compliant utility meters deployed outdoors. IC Role / Device Role / Timing Role: Primary SPI flash for verified firmware execution with hardware reset recovery capability. Use Value: RST#/HOLD# pin allows safe reset during brown-out events; 40 MHz read speed accelerates boot time under tight real-time constraints. |
Use Scenario: Storing vehicle-specific configuration profiles (e.g., mirror position, lighting behavior) in Class A automotive BCMs. IC Role / Device Role / Timing Role: Persistent settings storage accessible via MCU SPI interface during ignition-on initialization. Use Value: 4 KByte sector erase enables atomic update of individual feature sets without disturbing unrelated configurations. |
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 |
|---|---|---|---|
| AT25SF041-SSHD-B | 4 Mbit density, 1.7–2.0 V supply, 104 MHz max read, supports Quad SPI and DTR modes | Higher bandwidth and density; not drop-in compatible due to larger memory map and different instruction set | Select when migrating to higher-capacity firmware storage with enhanced throughput requirements |
| W25Q80DVSSIG | 8 Mbit density, 2.7–3.6 V supply, 104 MHz read, supports Dual/Quad SPI and QPI | Requires level-shifting for 1.8V systems; incompatible voltage range and advanced features increase design complexity | Choose only if existing 3.3V infrastructure exists and Quad SPI performance is mandatory |
Compared with AT25SF041-SSHD-B and W25Q80DVSSIG, the SST25WF512-40-5I-SAF offers optimal fit for cost-sensitive, space-constrained 1.8V embedded systems requiring proven reliability and minimal BOM changes - without over-provisioning memory or introducing voltage translation.
Availability
SST25WF512-40-5I-SAF is available at Aetrix Electronics and suitable for industrial control, medical diagnostics, smart metering, and automotive body electronics requiring stable component supply and long-lifecycle support.
Supply support for SST25WF512-40-5I-SAF 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 legacy SuperFlash product lines with full technical documentation and long-term support commitments.
The SST25WF512-40-5I-SAF belongs to the Serial Flash 25 Series, designed specifically for low-voltage, low-power embedded applications where reliability, small footprint, and SPI simplicity outweigh need for quad-interface bandwidth.
FAQ
What is the memory organization of the SST25WF512-40-5I-SAF?
The SST25WF512-40-5I-SAF contains 512 Kbit (64 KB) of memory organized exclusively in uniform 4 KByte sectors - totaling 16 erasable sectors. Unlike higher-density variants (SST25WF020/040), it does not support 32 KByte or 64 KByte overlay blocks. Each sector can be erased independently, and the entire array may be erased via Chip-Erase instruction.
Does the SST25WF512-40-5I-SAF support both SPI Mode 0 and Mode 3?
Yes, the SST25WF512-40-5I-SAF fully supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). This dual-mode capability ensures interoperability with a broad range of microcontrollers and FPGAs without requiring hardware modifications. The device samples SI on the rising edge and drives SO on the falling edge of SCK in both modes.
How does the RST#/HOLD# pin function on the SST25WF512-40-5I-SAF?
At power-up, the RST#/HOLD# pin defaults to hardware reset (RST#) functionality. It can be reconfigured to HOLD# mode via the Enable-Hold (EHLD) instruction. In HOLD# mode, ongoing SPI transactions pause without deselecting the device or resetting internal state. The pin reverts to RST# only after a full power cycle - not via software command.
What write protection mechanisms does the SST25WF512-40-5I-SAF provide?
The SST25WF512-40-5I-SAF implements both hardware and software write protection. WP# enables lock-down of the Block-Protection-Lock (BPL) bit in the status register. Software protection uses BP0–BP2 bits to define protected memory regions (none, upper quarter, upper half, or full array), with BPL preventing further modification when WP# is asserted low.
Is the SST25WF512-40-5I-SAF still in production or marked obsolete?
The SST25WF512-40-5I-SAF is an End-of-Life (EOL) part per Microchip's official documentation (DS20005016C, Nov 2014). However, Aetrix Electronics maintains active inventory and provides lifecycle coordination support, including last-time-buy planning and qualified replacements for ongoing production programs.
SST25WF512-40-5I-SAF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 512Kbit
- Memory Organization:
- 64K 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-SOIC
SST25WF512-40-5I-SAF FAQ
1.How can I place an order for SST25WF512-40-5I-SAF through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25WF512-40-5I-SAF 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 SST25WF512-40-5I-SAF reliable?
The price and inventory of SST25WF512-40-5I-SAF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25WF512-40-5I-SAF is usually 5 days.
3.What payment methods are accepted for SST25WF512-40-5I-SAF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25WF512-40-5I-SAF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25WF512-40-5I-SAF?
SST25WF512-40-5I-SAF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25WF512-40-5I-SAF 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 SST25WF512-40-5I-SAF?
For technical support, including SST25WF512-40-5I-SAF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25WF512-40-5I-SAF requirements.
6.How does Aetrix verify that SST25WF512-40-5I-SAF is sourced from the original manufacturer or authorized distributors?
All SST25WF512-40-5I-SAF 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 SST25WF512-40-5I-SAF meets industry standards.
7.What is the process for return or replacement of SST25WF512-40-5I-SAF?
All SST25WF512-40-5I-SAF units undergo pre-shipment inspection (PSI). If there is an issue with SST25WF512-40-5I-SAF, 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 SST25WF512-40-5I-SAF part is unused and in its original packaging.
Return procedure for SST25WF512-40-5I-SAF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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