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

Microchip Technology SST25PF040CT-40I/NP

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

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Part No.:: SST25PF040CT-40I/NP

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 8-UFDFN Exposed Pad

Datasheet:: SST25PF040CT-40I/NP.pdf

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

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Product details

Overview

SST25PF040CT-40I/NP from Microchip Technology is a 4 Mbit (512 KByte) SPI serial flash memory IC designed for embedded code storage and data logging in space-constrained industrial and automotive systems. It operates from a single 2.3–3.6V supply, supports 40 MHz high-speed read via Fast-Read Dual I/O (BBH), delivers 100,000 program/erase cycles, and retains data for >20 years at +85°C.

For engineers reviewing the SST25PF040CT-40I/NP datasheet, SST25PF040CT-40I/NP pinout, SST25PF040CT-40I/NP application, or SST25PF040CT-40I/NP equivalent, this page provides verified pin functions, dual-I/O timing behavior, sector/block erase granularity, write-protection architecture, and AEC-Q100-qualified thermal performance across USON, SOIC, and WDFN packages.

Technical Context

The SST25PF040CT-40I/NP implements a four-wire SPI interface compliant with Mode 0 and Mode 3 clock polarity/phasing, enabling interoperability with diverse microcontroller host interfaces. Its SuperFlash technology uses a split-gate cell with thick-oxide tunneling injector to achieve lower programming current and faster erase times versus conventional NOR flash.

It features dual I/O capability (SIO0/SIO1) supporting simultaneous address input and data output at up to 40 MHz, reducing instruction latency versus standard SPI reads. The device includes hardware HOLD# and WP# pins plus software-controlled block protection (BP0–BP2, TB, BPL) for flexible, layered memory security.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Density	4 Mbit (512 KByte), organized as 128 × 4 KByte sectors and 8 × 64 KByte overlay blocks - enables fine-grained firmware updates without full chip erase.
Max Clock Frequency	40 MHz for High-Speed Read (0BH), Fast-Read Dual-Output (3BH), and Fast-Read Dual I/O (BBH) - doubles effective throughput vs. standard 25 MHz SPI read.
Page Size	256 bytes - matches typical MCU cache line and bootloader packet size for efficient over-the-air firmware patching.
Erase Times	Sector-Erase: 40 ms (typical); Block-Erase: 80 ms (typical); Chip-Erase: 250 ms (typical) - reduces system downtime during field updates.
Power Consumption	Active Read: 5 mA (typical) at 40 MHz; Standby: 5 µA (typical); Power-down: 3 µA (typical) - extends battery life in always-on edge sensors.
Endurance & Retention	100,000 program/erase cycles; >20 years data retention at +85°C - meets long-lifecycle requirements for industrial control and automotive ECUs.
Operating Temperature	–40°C to +105°C (Industrial Plus grade) - qualified per AEC-Q100 Grade 2, suitable for under-hood and factory-floor environments.

Pinout & Package

Available in three RoHS-compliant packages: 8-contact USON (2 mm × 3 mm), 8-lead SOIC (150 mil), and 8-contact WDFN (5 mm × 6 mm). All share identical pinout and function mapping.

Pin/Terminal	Circuit Role	Design Meaning
CE#	Chip Enable	Active-low selection signal; must remain low throughout command sequence - enables multi-device SPI bus sharing with daisy-chained or decoded addressing.
SIO0 / SI	Serial Data Input / Dual I/O	Primary data input in standard mode; serves as even-bit data/address lane (D0/D2/D4/D6, A0/A2/…) in Dual I/O - eliminates need for separate address/data buses.
SIO1 / SO	Serial Data Output / Dual I/O	Primary data output in standard mode; serves as odd-bit data/address lane (D1/D3/D5/D7, A1/A3/…) in Dual I/O - enables 2× bandwidth efficiency in high-throughput bootloading.
SCK	Serial Clock	Edge-triggered timing reference; samples input on rising edge, outputs data on falling edge - supports both SPI Mode 0 (SCK idle low) and Mode 3 (SCK idle high).
WP#	Write Protect	Hardware lock-down enable for status register BP/BPL bits - prevents accidental firmware corruption during power transients or ESD events.
HOLD#	Hold	Pauses ongoing SPI transaction without deselecting device - allows host MCU to service higher-priority interrupts while preserving flash state.
VDD	Power Supply	2.3–3.6V single supply - compatible with 3.3V logic domains and wide-input DC-DC converters in mixed-voltage systems.
VSS	Ground	Reference return path for all digital and analog circuitry - requires low-inductance connection to minimize noise coupling into read operations.

Key Features

Feature	Design Value
Dual I/O Interface (3BH/BBH)	Enables 40 MHz read throughput with half the clock cycles of standard SPI - cuts boot time by ~35% in resource-constrained MCUs.
Flexible Erase Architecture	Independent 4 KByte sector and 64 KByte block erase - permits selective firmware module updates without disturbing calibration data or secure keys.
Hardware Write Protection	WP# pin controls BPL bit to lock status register configuration - ensures immutable boot code protection after factory programming.
SuperFlash Technology	Split-gate cell with thick-oxide tunneling injector - achieves 100K endurance and <3 µA power-down current without external charge pumps.
AEC-Q100 Qualified	Validated for automotive Grade 2 (–40°C to +105°C) operation - supports deployment in engine control units, ADAS sensors, and infotainment head units.

Applications

Firmware Storage in Automotive ECUs	Secure Bootloader in Industrial PLCs
Use Scenario: Storing calibrated engine maps, diagnostic logs, and OTA update payloads in an engine control unit operating under hood temperatures up to +105°C. IC Role / Device Role / Timing Role: Nonvolatile code storage with deterministic 40 MHz dual-I/O read access and hardware write-lock for ASIL-B critical firmware partitions. Use Value: Eliminates need for external voltage supervisors or backup capacitors due to single-supply 2.3–3.6V operation and >20-year data retention at elevated temperature.	Use Scenario: Hosting signed bootloader images and cryptographic keys in programmable logic controllers deployed in factory automation environments with frequent power cycling. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage with software-configurable block protection (BP0–BP2) and hardware WP# lockdown to prevent unauthorized firmware modification. Use Value: Enables field-upgradable firmware while maintaining integrity of root-of-trust keys - validated by AEC-Q100 thermal stress testing and 100K-cycle endurance.
Data Logging in Edge IoT Sensors	Configuration Storage in Medical Devices
Use Scenario: Capturing sensor fusion timestamps, environmental readings, and fault records in battery-powered wireless condition-monitoring nodes. IC Role / Device Role / Timing Role: Low-power nonvolatile memory with 3 µA power-down current and fast 40 ms sector erase - minimizes energy per write cycle. Use Value: Extends node lifetime beyond 5 years on coin-cell batteries by reducing active current to 5 mA at 40 MHz and eliminating standby leakage paths.	Use Scenario: Storing device calibration coefficients, user preferences, and regulatory compliance metadata in portable diagnostic equipment requiring FDA-grade traceability. IC Role / Device Role / Timing Role: Reliable, long-retention storage with end-of-write detection (BUSY bit polling) and error-resilient dual-I/O read for fail-safe configuration recovery. Use Value: Guarantees >20-year data integrity at +85°C - exceeds IEC 60601-1 ambient storage requirements for Class II medical electronics.

Firmware Storage in Automotive ECUs

Secure Bootloader in Industrial PLCs

Use Scenario: Storing calibrated engine maps, diagnostic logs, and OTA update payloads in an engine control unit operating under hood temperatures up to +105°C.

IC Role / Device Role / Timing Role: Nonvolatile code storage with deterministic 40 MHz dual-I/O read access and hardware write-lock for ASIL-B critical firmware partitions.

Use Value: Eliminates need for external voltage supervisors or backup capacitors due to single-supply 2.3–3.6V operation and >20-year data retention at elevated temperature.

Use Scenario: Hosting signed bootloader images and cryptographic keys in programmable logic controllers deployed in factory automation environments with frequent power cycling.

IC Role / Device Role / Timing Role: Secure, tamper-resistant storage with software-configurable block protection (BP0–BP2) and hardware WP# lockdown to prevent unauthorized firmware modification.

Use Value: Enables field-upgradable firmware while maintaining integrity of root-of-trust keys - validated by AEC-Q100 thermal stress testing and 100K-cycle endurance.

Data Logging in Edge IoT Sensors

Configuration Storage in Medical Devices

Use Scenario: Capturing sensor fusion timestamps, environmental readings, and fault records in battery-powered wireless condition-monitoring nodes.

IC Role / Device Role / Timing Role: Low-power nonvolatile memory with 3 µA power-down current and fast 40 ms sector erase - minimizes energy per write cycle.

Use Value: Extends node lifetime beyond 5 years on coin-cell batteries by reducing active current to 5 mA at 40 MHz and eliminating standby leakage paths.

Use Scenario: Storing device calibration coefficients, user preferences, and regulatory compliance metadata in portable diagnostic equipment requiring FDA-grade traceability.

IC Role / Device Role / Timing Role: Reliable, long-retention storage with end-of-write detection (BUSY bit polling) and error-resilient dual-I/O read for fail-safe configuration recovery.

Use Value: Guarantees >20-year data integrity at +85°C - exceeds IEC 60601-1 ambient storage requirements for Class II medical electronics.

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 W25Q40EW	4 Mbit, 1.65–1.95V or 2.7–3.6V dual supply; supports Quad SPI (QPI) but no Dual I/O; 100K endurance; –40°C to +105°C	Lacks HOLD#/WP# hardware pins; relies on software protection only; QPI mode requires different driver stack than SPI	Select if Quad SPI bandwidth >40 MHz is required and host supports QPI protocol; avoid if HOLD# interrupt handling or hardware write-lock is mandatory.
Cypress S25FL004A	4 Mbit, 2.7–3.6V; supports standard SPI only (no Dual I/O); 100K endurance; –40°C to +85°C industrial grade	No Dual I/O or Fast-Read Dual Output instructions; lacks AEC-Q100 qualification; slower 33 MHz max clock	Choose for cost-sensitive industrial designs where 40 MHz dual-I/O is unnecessary and automotive qualification is not required.

Compared with W25Q40EW and S25FL004A, the SST25PF040CT-40I/NP uniquely combines AEC-Q100 Grade 2 qualification, hardware HOLD#/WP# pins, and 40 MHz Dual I/O support - making it optimal for automotive and high-reliability industrial boot memory where deterministic timing, thermal robustness, and hardware-level security are non-negotiable.

Availability

SST25PF040CT-40I/NP is available at Aetrix Electronics and suitable for automotive ECU firmware storage, industrial PLC bootloader hosting, and medical device configuration retention requiring stable component supply across extended product lifecycles.

Supply support for SST25PF040CT-40I/NP 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 for embedded control applications.

The SST25PF040CT-40I/NP belongs to Microchip's Serial Flash 25 Series, engineered specifically for high-reliability, low-power, and space-constrained code storage in automotive, industrial, and medical systems demanding AEC-Q100 qualification and long-term data integrity.

FAQ

What is the maximum clock frequency supported by SST25PF040CT-40I/NP for high-speed read operations?

The SST25PF040CT-40I/NP supports up to 40 MHz for High-Speed Read (0BH), Fast-Read Dual-Output (3BH), and Fast-Read Dual I/O (BBH) instructions. This is confirmed in the DS20005397E datasheet Section 5.2–5.4 and Feature list. Standard Read (03H) is limited to 25 MHz. The 40 MHz capability directly enables faster boot times and reduced firmware update latency in real-time systems using the SST25PF040CT-40I/NP.

Does SST25PF040CT-40I/NP support both SPI Mode 0 and Mode 3?

Yes, the SST25PF040CT-40I/NP explicitly supports both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), as stated in the Features section and Section 4.0 of DS20005397E. This dual-mode compatibility ensures seamless integration with a broad range of microcontrollers - including those with fixed SPI polarity settings - without requiring level-shifting or protocol translation when using the SST25PF040CT-40I/NP.

How does the HOLD# pin function during an active SPI transaction with SST25PF040CT-40I/NP?

The HOLD# pin suspends an ongoing SPI sequence without deselecting the device or resetting internal state, as defined in Section 4.0.1 and Figure 4-2 of DS20005397E. When CE# is low and HOLD# transitions low coincident with SCK low, the device enters Hold mode: SO goes high-impedance, while SI and SCK remain valid. This allows the host MCU to service interrupts or reconfigure peripherals mid-transaction, then resume exactly where it left off - a critical capability for deterministic timing in safety-critical applications using the SST25PF040CT-40I/NP.

What memory protection mechanisms are implemented in SST25PF040CT-40I/NP?

The SST25PF040CT-40I/NP implements three-tiered protection: (1) Hardware WP# pin enabling BPL bit lock-down of status register bits; (2) Software-configurable block protection (BP0–BP2, TB) defining 1/8 to full-array protected regions; and (3) Write-Enable-Latch (WEL) bit requiring explicit WREN instruction before any erase/program. These are fully documented in Sections 4.1, 4.2.3, and 4.2.2 of DS20005397E. This layered approach ensures robust firmware integrity in systems deploying the SST25PF040CT-40I/NP.

Is SST25PF040CT-40I/NP qualified for automotive applications?

Yes, the SST25PF040CT-40I/NP is explicitly AEC-Q100 Qualified (Grade 2) for operation from –40°C to +105°C, as stated in the Features section and Section 1.0 of DS20005397E. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and electrical reliability - validating its suitability for under-hood automotive ECUs, body control modules, and ADAS sensors where the SST25PF040CT-40I/NP serves as primary firmware storage.

SST25PF040CT-40I/NP Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: SST25

Package/Case:: 8-UFDFN Exposed Pad

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 ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-UDFN (2x3)

SST25PF040CT-40I/NP FAQ

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

Please submit a Request for Quotation (RFQ) for SST25PF040CT-40I/NP 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-40I/NP reliable?

The price and inventory of SST25PF040CT-40I/NP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25PF040CT-40I/NP is usually 5 days.

3.What payment methods are accepted for SST25PF040CT-40I/NP?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SST25PF040CT-40I/NP?

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

Once your SST25PF040CT-40I/NP 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-40I/NP?

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

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

All SST25PF040CT-40I/NP 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-40I/NP meets industry standards.

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

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

Return procedure for SST25PF040CT-40I/NP:

1.Submit a request within 90 days.

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

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