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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology SST25PF040CT-40V/MF18GVAO

Name: SST25PF040CT-40V/MF18GVAO
Brand: Microchip Technology
SKU: SST25PF040CT-40V/MF18GVAO
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SST25PF040CT-40V/MF18GVAO

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-WDFN Exposed Pad

Datasheet:: SST25PF040CT-40V/MF18GVAO.pdf

Description:: IC FLASH 4MBIT SPI 40MHZ 8WDFN

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Product details

Overview

SST25PF040CT-40V/MF18GVAO from Microchip Technology is a 4 Mbit (512 K × 8) SPI serial flash memory IC with SuperFlash® technology, operating at 2.3–3.6 V, supporting 40 MHz high-speed read via Fast-Read Dual I/O (BBH), and qualified for industrial temperature range (−40°C to +105°C). It delivers ultra-low active current (5 mA typ), 100,000 program/erase endurance, and 20+ years data retention - deployed in firmware storage for microcontroller-based edge sensors and boot code storage in industrial PLCs.

For engineers reviewing the SST25PF040CT-40V/MF18GVAO datasheet, SST25PF040CT-40V/MF18GVAO pinout, SST25PF040CT-40V/MF18GVAO application, or SST25PF040CT-40V/MF18GVAO equivalent, key selection considerations include its dual-I/O timing compliance (Mode 0/3), 256-byte page programming granularity, 4 KB sector/64 KB block erase flexibility, HOLD#/WP# hardware control support, and USON-8 (2 mm × 3 mm) package footprint for space-constrained embedded designs.

Technical Context

This SPI flash uses proprietary SuperFlash split-gate cell architecture with thick-oxide tunneling injector, enabling lower program current and shorter erase times versus conventional NOR flash. Its command set supports four distinct read modes - standard Read (03H, 25 MHz), High-Speed Read (0BH, 40 MHz), Fast-Read Dual-Output (3BH), and Fast-Read Dual I/O (BBH) - all synchronized to CE# low assertion and SCK edge-triggered sampling.

The device implements a software status register with BUSY (bit 0), WEL (bit 1), and configurable block protection (BP0–BP2, TB, BPL) bits, where WP# enables BPL lock-down and HOLD# suspends ongoing serial transfers without deselecting the chip. Memory is organized into 128 uniform 4 KB sectors and eight 64 KB overlay blocks, with address wrap-around on sequential reads.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Density	4 Mbit (512 K × 8), sufficient for bootloader + configuration + firmware patch storage in resource-limited MCUs
Supply Voltage	2.3–3.6 V single supply - compatible with 3.3 V I/O domains and eliminates need for level shifters
Max Clock Frequency	40 MHz (Fast-Read Dual I/O mode) - enables ~10 MB/s effective throughput with dual-line data transfer
Erase Granularity	Uniform 4 KB sectors and 64 KB blocks - allows fine-grained firmware update partitioning without full chip erase
Endurance & Retention	100,000 program/erase cycles; >20 years data retention - meets long-life requirements for industrial field equipment
Power Consumption	5 µA standby (typ), 3 µA power-down - critical for battery-backed or energy-harvesting sensor nodes
Temperature Range	−40°C to +105°C (Industrial Plus) - validated for operation inside sealed enclosures near motor drives or power converters

Pinout & Package

Package: 8-contact USON (2 mm × 3 mm), RoHS-compliant, moisture-sensitive level 3 (MSL3).

Pin/Terminal	Circuit Role	Design Meaning
CE#	Chip Enable	Active-low device select; must remain low throughout command sequence; high state places device in standby
SO/SIO1	Serial Data Output / Dual I/O Line 1	Outputs odd data bits (D7,D5,D3,D1) during Dual I/O reads; functions as input for address bits A23,A21,… in BBH mode
WP#	Write Protect	Enables BPL bit lock-down; when low, prevents modification of BP0–BP2, TB, and BPL bits in status register
VSS	Ground	Reference return path for all digital and analog circuitry; requires low-impedance PCB connection
VDD	Power Supply	2.3–3.6 V supply input; decoupling capacitor (≥100 nF) required within 5 mm of pin per layout guidelines
HOLD#	Hold Control	Suspends active SPI transaction (e.g., mid-read) without resetting internal address pointer or clock phase
SCK	Serial Clock	Edge-triggered interface clock; supports both SPI Mode 0 (SCK idle low) and Mode 3 (SCK idle high)
SI/SIO0	Serial Data Input / Dual I/O Line 0	Inputs commands/addresses/data; outputs even data bits (D6,D4,D2,D0) during Dual I/O reads

Key Features

Feature	Design Value
SuperFlash® Technology	Split-gate cell with thick-oxide injector reduces program current and erase time - cuts total energy per erase by >40% vs. standard NOR
Dual I/O Interface (BBH)	Simultaneous address input (A23–A0) and data output on SIO0/SIO1 - halves clock cycles needed for 24-bit address + data fetch
Flexible Block Protection	Configurable top/bottom 1/8, 1/4, or 1/2 memory protection via BP0–BP2/TB bits - enables secure bootloader partitioning
HOLD# Pin Functionality	Pauses active SPI sequences (e.g., during interrupt servicing) without losing address context or requiring re-initialization
Page Programming	256-byte page boundary alignment with automatic wrap-around - simplifies host firmware buffer management for partial-page writes

Applications

Firmware Storage in Industrial PLCs	Secure Boot Code Storage
Use Scenario: Stores ladder logic firmware and I/O mapping tables in programmable logic controllers operating in factory-floor environments with EMI and thermal cycling. IC Role / Device Role / Timing Role: Non-volatile code storage accessed via SPI during cold boot and runtime firmware updates; supports fast 40 MHz Dual I/O reads to minimize boot latency. Use Value: 100,000-cycle endurance ensures reliable field updates over 10+ years; −40°C to +105°C rating guarantees operation inside sealed control cabinets near 3-phase inverters.	Use Scenario: Holds immutable bootloader image and public-key verification keys in safety-critical medical devices requiring secure boot chain validation. IC Role / Device Role / Timing Role: Read-only boot memory with hardware write protection (WP# + BPL); verified during power-on reset before loading application firmware. Use Value: Software-configurable block protection (TB/BP bits) isolates bootloader region from accidental overwrite; >20-year data retention prevents key corruption in shelf-stored devices.
Edge Sensor Configuration Storage	Wireless Gateway Firmware Caching
Use Scenario: Stores calibrated sensor coefficients, network credentials, and OTA update metadata in battery-powered environmental monitoring nodes. IC Role / Device Role / Timing Role: Low-power configuration store accessed intermittently via SPI; leverages 3 µA power-down mode between transmissions. Use Value: 5 µA standby and 3 µA power-down current extend 10-year battery life in LoRaWAN sensors; USON-8 package minimizes PCB area in compact IP67 housings.	Use Scenario: Caches firmware images and routing tables in cellular/NB-IoT gateways that perform periodic remote updates over constrained links. IC Role / Device Role / Timing Role: High-throughput firmware staging memory; uses Fast-Read Dual I/O (BBH) to load 256 KB images in <250 ms. Use Value: 40 MHz dual-line read speed enables sub-second firmware load times; 4 KB sector erase allows atomic patch application without disrupting active services.

Firmware Storage in Industrial PLCs

Secure Boot Code Storage

Use Scenario: Stores ladder logic firmware and I/O mapping tables in programmable logic controllers operating in factory-floor environments with EMI and thermal cycling.

IC Role / Device Role / Timing Role: Non-volatile code storage accessed via SPI during cold boot and runtime firmware updates; supports fast 40 MHz Dual I/O reads to minimize boot latency.

Use Value: 100,000-cycle endurance ensures reliable field updates over 10+ years; −40°C to +105°C rating guarantees operation inside sealed control cabinets near 3-phase inverters.

Use Scenario: Holds immutable bootloader image and public-key verification keys in safety-critical medical devices requiring secure boot chain validation.

IC Role / Device Role / Timing Role: Read-only boot memory with hardware write protection (WP# + BPL); verified during power-on reset before loading application firmware.

Use Value: Software-configurable block protection (TB/BP bits) isolates bootloader region from accidental overwrite; >20-year data retention prevents key corruption in shelf-stored devices.

Edge Sensor Configuration Storage

Wireless Gateway Firmware Caching

Use Scenario: Stores calibrated sensor coefficients, network credentials, and OTA update metadata in battery-powered environmental monitoring nodes.

IC Role / Device Role / Timing Role: Low-power configuration store accessed intermittently via SPI; leverages 3 µA power-down mode between transmissions.

Use Value: 5 µA standby and 3 µA power-down current extend 10-year battery life in LoRaWAN sensors; USON-8 package minimizes PCB area in compact IP67 housings.

Use Scenario: Caches firmware images and routing tables in cellular/NB-IoT gateways that perform periodic remote updates over constrained links.

IC Role / Device Role / Timing Role: High-throughput firmware staging memory; uses Fast-Read Dual I/O (BBH) to load 256 KB images in <250 ms.

Use Value: 40 MHz dual-line read speed enables sub-second firmware load times; 4 KB sector erase allows atomic patch application without disrupting active services.

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial flash memory applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Winbond W25Q40EWUXIE	4 Mbit, 1.65–1.95 V core + 3.3 V I/O; Quad SPI only; no HOLD#/WP# pins; SOIC-8 only	Lacks hardware hold/write-protect pins; requires external GPIO control for suspend/protection; incompatible pinout	Select if system uses Quad SPI controller and operates at 1.8 V; avoid if HOLD#/WP# hardware control or USON-8 footprint is required.
Cypress S25FL004KAGMFI010	4 Mbit, 2.7–3.6 V; supports x1/x2/x4 SPI; includes SFDP register; SOIC-8/WSON-8 packages	Higher minimum voltage (2.7 V); supports SFDP for auto-configuration; no USON-8 option in this variant	Prefer for systems needing JEDEC-standard SFDP discovery; verify 2.7 V min supply compatibility; confirm WSON-8 (6×5 mm) fits layout vs. USON-8 (2×3 mm).

Compared with W25Q40EWUXIE and S25FL004KAGMFI010, SST25PF040CT-40V/MF18GVAO uniquely combines USON-8 footprint, dedicated HOLD#/WP# pins, 2.3 V low-voltage operation, and SuperFlash energy efficiency - making it optimal for space- and power-constrained industrial edge nodes requiring robust hardware-controlled flash access.

Availability

SST25PF040CT-40V/MF18GVAO is available at Aetrix Electronics and suitable for industrial automation controllers, medical diagnostic sensors, and wireless gateway firmware caching requiring stable component supply across multi-year production cycles.

Supply support for SST25PF040CT-40V/MF18GVAO 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with emphasis on reliability, longevity, and industrial-grade qualification.

SST25PF040CT-40V/MF18GVAO belongs to Microchip's Serial Flash 25 Series, designed specifically for cost-sensitive, space-constrained embedded systems requiring high reliability, low power, and flexible erase/program operations in harsh environments.

FAQ

What is the maximum clock frequency supported by SST25PF040CT-40V/MF18GVAO in Fast-Read Dual I/O mode?

SST25PF040CT-40V/MF18GVAO supports up to 40 MHz in Fast-Read Dual I/O (BBH) mode. This mode uses both SIO0 and SIO1 for simultaneous address input and data output, achieving higher effective throughput than standard SPI reads. The 40 MHz rating is specified under industrial temperature conditions (−40°C to +105°C) and 3.3 V supply, with setup/hold timing margins maintained per DS20005397E.

Does SST25PF040CT-40V/MF18GVAO support SPI Mode 0 and Mode 3 simultaneously?

Yes, SST25PF040CT-40V/MF18GVAO is fully compatible with both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1). The device samples SI on the rising edge and drives SO on the falling edge of SCK in both modes. Mode selection is determined by the host controller's SCK idle state - no configuration register or command is required to switch between them.

How does the HOLD# pin function during an active read operation in SST25PF040CT-40V/MF18GVAO?

During an active read, asserting HOLD# low (while CE# remains low and SCK is low) suspends the ongoing SPI transaction without resetting the internal address pointer or clock phase. SO enters high-impedance, while SI and SCK may be driven to any valid logic level. Resuming requires driving HOLD# high coincident with SCK low - the device continues from the exact byte position where it paused, preserving seamless firmware streaming.

What memory organization does SST25PF040CT-40V/MF18GVAO use, and how does it affect erase operations?

SST25PF040CT-40V/MF18GVAO organizes its 4 Mbit array into 128 uniform 4 KB sectors and eight 64 KB overlay blocks. Sector-erase (20H/D7H) clears one 4 KB unit in 40 ms (typ); block-erase (D8H) clears one 64 KB unit in 80 ms (typ). This hierarchy enables precise firmware updates - e.g., erasing only the application partition while preserving bootloader and calibration data in protected sectors.

Is SST25PF040CT-40V/MF18GVAO qualified for automotive applications?

No, SST25PF040CT-40V/MF18GVAO is not AEC-Q100 qualified. While the underlying SST25PF040C family includes AEC-Q100 variants (e.g., SST25PF040CT-40V/MF18GVAO's datasheet notes "Automotive AEC-Q100 Qualified" for the base part), this specific suffix (-MF18GVAO) denotes the Industrial Plus grade (−40°C to +105°C), packaged in USON-8. For automotive use, Microchip offers separate AEC-Q100 qualified SKUs with different temperature screening and traceability.

SST25PF040CT-40V/MF18GVAO Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

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:: 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:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 8-WDFN (5x6)

SST25PF040CT-40V/MF18GVAO FAQ

1.How can I place an order for SST25PF040CT-40V/MF18GVAO through Aetrix?

Please submit a Request for Quotation (RFQ) for SST25PF040CT-40V/MF18GVAO 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/MF18GVAO reliable?

The price and inventory of SST25PF040CT-40V/MF18GVAO 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/MF18GVAO is usually 5 days.

3.What payment methods are accepted for SST25PF040CT-40V/MF18GVAO?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25PF040CT-40V/MF18GVAO transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SST25PF040CT-40V/MF18GVAO?

SST25PF040CT-40V/MF18GVAO orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SST25PF040CT-40V/MF18GVAO 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/MF18GVAO?

For technical support, including SST25PF040CT-40V/MF18GVAO datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25PF040CT-40V/MF18GVAO requirements.

6.How does Aetrix verify that SST25PF040CT-40V/MF18GVAO is sourced from the original manufacturer or authorized distributors?

All SST25PF040CT-40V/MF18GVAO 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/MF18GVAO meets industry standards.

7.What is the process for return or replacement of SST25PF040CT-40V/MF18GVAO?

All SST25PF040CT-40V/MF18GVAO units undergo pre-shipment inspection (PSI). If there is an issue with SST25PF040CT-40V/MF18GVAO, 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/MF18GVAO part is unused and in its original packaging.

Return procedure for SST25PF040CT-40V/MF18GVAO:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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