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Microchip Technology SST25PF040CT-40V/SN
- Part No.:
- SST25PF040CT-40V/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SST25PF040CT-40V/SN.pdf
- Description:
- IC FLASH 4MBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,122
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Product details
Overview
SST25PF040CT-40V/SN from Microchip Technology is a 4 Mbit SPI serial flash memory IC with SuperFlash technology, supporting single-supply operation (2.3–3.6 V), 40 MHz high-speed read, dual I/O interface, and AEC-Q100-qualified industrial temperature range (–40°C to +105°C). It delivers fast page programming (4 ms/256 B), sector erase (40 ms), and chip erase (250 ms) for embedded firmware storage in space-constrained applications.
For engineers reviewing the SST25PF040CT-40V/SN datasheet, SST25PF040CT-40V/SN pinout, SST25PF040CT-40V/SN application, or SST25PF040CT-40V/SN equivalent, this device serves as a drop-in upgrade path for legacy 4 Mbit SPI flash in automotive infotainment boot code storage, industrial PLC firmware retention, and IoT edge node configuration memory where low-power standby (3 µA in power-down mode) and robust write endurance (100,000 cycles) are critical.
Technical Context
This SPI flash uses Microchip's proprietary SuperFlash split-gate cell architecture with thick-oxide tunneling injector, enabling faster erase times and higher reliability than conventional NOR flash. Its command set supports standard SPI Mode 0 and Mode 3, plus enhanced dual-output (3BH) and dual I/O (BBH) instructions for bandwidth-critical reads.
The device integrates hardware HOLD# and WP# pins for real-time suspend and block-level software write protection via status register BP0–BP2/TB/BPL bits. Memory is organized into 128 uniform 4 KByte sectors and eight 64 KByte overlay blocks, enabling granular firmware update partitioning without full chip erase.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512 KByte), sufficient for compact bootloader + parameter storage in microcontroller-based systems |
| Supply Voltage | 2.3–3.6 V single supply - compatible with 3.3 V logic rails and eliminates need for separate voltage regulators |
| Max Clock Frequency | 40 MHz - enables 5 MB/s effective read throughput using Fast-Read Dual I/O mode |
| Page Size | 256 bytes - aligns with typical MCU cache line and firmware update packet sizes for efficient programming |
| Endurance | 100,000 program/erase cycles - supports frequent field firmware updates over product lifetime |
| Data Retention | >20 years at +85°C - ensures long-term reliability in industrial and automotive environments |
| Standby Current | 3 µA in power-down mode - minimizes quiescent power in battery-backed or energy-harvested devices |
Pinout & Package
Package: 8-contact USON (2 mm × 3 mm), RoHS-compliant, thermally enhanced for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low selection signal; must remain low during entire command sequence to prevent premature termination |
| SO/SIO1 | Serial Data Output / Dual I/O Line 1 | Outputs odd data bits (D7,D5,D3,D1) in Dual I/O mode; functions as standard SO in single-I/O mode |
| WP# | Write Protect | Enables lock-down of Block-Protection bits (BP0–BP2, TB, BPL) when driven low; prevents accidental firmware overwrite |
| VSS | Ground | Reference return path for all digital and analog circuitry; requires low-impedance connection to PCB ground plane |
| VDD | Power Supply | 2.3–3.6 V input; decoupling capacitor (0.1 µF) required within 1 mm of pin for stable high-speed operation |
| HOLD# | Hold Control | Suspends ongoing SPI transaction without deselecting device; allows host to service higher-priority interrupts mid-read |
| SCK | Serial Clock | Timing reference for all SPI transfers; supports both Mode 0 (idle low) and Mode 3 (idle high) clock polarity |
| SI/SIO0 | Serial Data Input / Dual I/O Line 0 | Inputs even address/data bits in Dual I/O mode; functions as standard SI in single-I/O mode |
Key Features
| Feature | Design Value |
|---|---|
| Dual I/O Read Interface (BBH) | Reduces address+data transfer time by 50% vs standard SPI, accelerating firmware load times in resource-constrained hosts |
| Uniform 4 KByte Sectors | Enables atomic firmware patching and rollback without erasing unrelated application sections |
| Hardware HOLD# Pin | Preserves internal state during host interrupt servicing - avoids reinitialization overhead and timing-critical re-synchronization |
| Block-Protection Lock-Down (BPL) | Prevents unauthorized modification of protection bits once WP# is asserted, meeting secure boot integrity requirements |
| AEC-Q100 Qualified | Validated for automotive-grade temperature cycling, ESD, and HTOL - suitable for under-hood and infotainment ECUs |
Applications
| Automotive Infotainment Boot Memory | Industrial PLC Firmware Storage |
|---|---|
Use Scenario: Stores boot loader and initial firmware image for head unit MCU, loaded at power-on reset. IC Role / Device Role / Timing Role: Nonvolatile configuration and code storage with deterministic 40 MHz read access for sub-100 ms boot time. Use Value: AEC-Q100 qualification ensures reliable operation across –40°C to +105°C ambient; dual I/O mode reduces boot latency versus legacy 25 MHz SPI flash. |
Use Scenario: Holds user-programmable ladder logic and calibration tables in programmable logic controllers. IC Role / Device Role / Timing Role: Field-upgradable persistent memory with sector-erase granularity to preserve runtime parameters during firmware updates. Use Value: 100,000-cycle endurance supports daily firmware revisions in factory automation; 3 µA power-down current extends backup battery life. |
| IoT Edge Node Configuration | Medical Device Parameter Storage |
Use Scenario: Stores network credentials, sensor calibration offsets, and OTA update staging area in battery-powered wireless sensors. IC Role / Device Role / Timing Role: Low-energy nonvolatile memory supporting intermittent wake-up and rapid configuration reload. Use Value: 5 µA active read current and 3 µA power-down mode minimize average system power; USON package saves board space in compact enclosures. |
Use Scenario: Retains device-specific calibration coefficients, usage logs, and safety-critical configuration settings in portable diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-resistant storage with hardware write protection to meet IEC 62304 data integrity requirements. Use Value: WP#-enabled BPL bit prevents runtime corruption of calibration data; >20-year data retention ensures accuracy over multi-decade device lifespan. |
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 W25Q40EW | Same density (4 Mbit), 1.8 V min supply, 104 MHz quad I/O max, no HOLD# pin | Lacks hardware hold functionality; requires software-managed transaction suspension | Choose when quad I/O bandwidth is prioritized over interrupt-safe hold capability |
| Cypress S25FL004A | Legacy 4 Mbit SPI flash, 3.0–3.6 V only, 50 MHz max, no dual I/O support, 100K endurance | Slower read performance and narrower voltage range; lacks modern dual I/O acceleration | Acceptable for cost-sensitive, non-automotive designs where 40 MHz speed and extended temp range are not required |
Compared with W25Q40EW and S25FL004A, SST25PF040CT-40V/SN uniquely combines AEC-Q100 qualification, hardware HOLD#, and 40 MHz dual I/O in a 2×3 mm USON package-making it optimal for automotive and industrial applications demanding robustness, deterministic timing, and space efficiency.
Availability
SST25PF040CT-40V/SN is available at Aetrix Electronics and suitable for automotive infotainment boot memory, industrial PLC firmware storage, and IoT edge node configuration requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SST25PF040CT-40V/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 devices, and memory solutions, with leadership in embedded control and secure connectivity.
SST25PF040CT-40V/SN belongs to Microchip's Serial Flash 25 Series, designed specifically for high-reliability, low-power, and space-constrained embedded applications requiring fast, secure, and durable nonvolatile storage.
FAQ
What is the operating temperature range for SST25PF040CT-40V/SN?
SST25PF040CT-40V/SN is rated for the Industrial Plus temperature range of –40°C to +105°C and is AEC-Q100 qualified, making it suitable for under-hood automotive electronics and high-ambient industrial environments. This specification is validated per Microchip's DS20005397E datasheet and applies specifically to the -40V/SN suffix variant.
Does SST25PF040CT-40V/SN support both SPI Mode 0 and Mode 3?
Yes, SST25PF040CT-40V/SN fully supports both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), as confirmed in Section 4.0 of the DS20005397E datasheet. The device samples SI on the rising edge and drives SO on the falling edge of SCK in both modes, ensuring interoperability with diverse host controllers.
How does the HOLD# pin function in SST25PF040CT-40V/SN?
In SST25PF040CT-40V/SN, the HOLD# pin suspends an active SPI transaction without deselecting the device or resetting internal state. When asserted low during SCK low time, it places SO in high-impedance while preserving the command/address context - enabling the host MCU to service interrupts and resume seamlessly, as detailed in Figure 4-2 and Section 4.0.1 of the datasheet.
What is the maximum page-program time for SST25PF040CT-40V/SN?
The maximum page-program time for SST25PF040CT-40V/SN is 4 ms per 256-byte page under typical conditions, as specified in the "Fast Erase and Page-Program" section of DS20005397E. This value reflects the self-timed internal programming cycle; end-of-write detection is implemented via polling the BUSY bit in the status register.
Is SST25PF040CT-40V/SN pin-compatible with other packages in the SST25PF040C family?
Yes, SST25PF040CT-40V/SN shares identical pinout and electrical behavior with other SST25PF040C variants in SOIC (150 mil) and WDFN (5×6 mm) packages, as shown in Figure 2-1 of DS20005397E. All variants use the same 8-pin SPI interface (CE#, SO/SIO1, WP#, VSS, VDD, HOLD#, SCK, SI/SIO0) with consistent pin numbering and function mapping.
SST25PF040CT-40V/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:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 40 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SST25PF040CT-40V/SN FAQ
1.How can I place an order for SST25PF040CT-40V/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25PF040CT-40V/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 SST25PF040CT-40V/SN reliable?
The price and inventory of SST25PF040CT-40V/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25PF040CT-40V/SN is usually 5 days.
3.What payment methods are accepted for SST25PF040CT-40V/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25PF040CT-40V/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25PF040CT-40V/SN?
SST25PF040CT-40V/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25PF040CT-40V/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 SST25PF040CT-40V/SN?
For technical support, including SST25PF040CT-40V/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25PF040CT-40V/SN requirements.
6.How does Aetrix verify that SST25PF040CT-40V/SN is sourced from the original manufacturer or authorized distributors?
All SST25PF040CT-40V/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 SST25PF040CT-40V/SN meets industry standards.
7.What is the process for return or replacement of SST25PF040CT-40V/SN?
All SST25PF040CT-40V/SN units undergo pre-shipment inspection (PSI). If there is an issue with SST25PF040CT-40V/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 SST25PF040CT-40V/SN part is unused and in its original packaging.
Return procedure for SST25PF040CT-40V/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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