My Inquiry
My Account
Microchip Technology SST25PF040CT-40E/MF
- Part No.:
- SST25PF040CT-40E/MF
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
SST25PF040CT-40E/MF.pdf
- Description:
- IC FLASH 4MBIT SPI 40MHZ 8WDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,260
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SST25PF040CT-40E/MF from Microchip Technology is a 4 Mbit (512 KByte), 3.3V SPI serial flash memory IC with SuperFlash® technology, supporting 40 MHz high-speed read, dual-output and dual I/O modes, and uniform 4 KByte sector/64 KByte block erase - deployed in embedded firmware storage, boot code retention, and configuration data logging for industrial controllers and automotive ECUs.
For engineers reviewing the SST25PF040CT-40E/MF datasheet, SST25PF040CT-40E/MF pinout, SST25PF040CT-40E/MF application, or SST25PF040CT-40E/MF equivalent, this page delivers verified pin functions, real-world timing behavior (e.g., 4 ms/page program, 40 ms/sector erase), automotive-grade temperature support (–40°C to +125°C), and validated alternative parts for migration or sourcing continuity.
Technical Context
The SST25PF040CT-40E/MF implements a four-wire SPI interface compliant with Mode 0 and Mode 3 clock polarity/phasing, using CE#, SCK, SI/SIO0, and SO/SIO1 signals to enable single-supply (2.3–3.6 V) read/write operations without external voltage translation. Its split-gate SuperFlash cell architecture delivers 100,000 program/erase cycles and >20-year data retention.
It supports three accelerated read protocols: High-Speed Read (0BH, 40 MHz, 1 dummy byte), Fast-Read Dual-Output (3BH, 40 MHz, SIO0/SIO1 simultaneous output), and Fast-Read Dual I/O (BBH, 40 MHz, address/data on both SIO lines), all with wrap-around addressing and automatic internal address incrementing up to 7FFFFH.
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 granular firmware partitioning and OTA update staging. |
| Read Speed | 40 MHz max (High-Speed Read, Fast-Read Dual-Output, Fast-Read Dual I/O) - reduces boot time by ~60% vs. standard 25 MHz SPI flash. |
| Write/Erase Performance | Page-program: 4 ms/256 bytes; Sector-erase: 40 ms; Block-erase: 80 ms; Chip-erase: 250 ms - accelerates field firmware updates and log rotation. |
| Power Consumption | Active read current: 5 mA typical; Standby: 5 µA; Power-down mode: 3 µA - extends battery life in always-on IoT edge nodes. |
| Endurance & Retention | 100,000 program/erase cycles; >20 years data retention at +85°C - meets long-lifecycle requirements for industrial automation and automotive modules. |
| Temperature Range | –40°C to +125°C (Extended grade), AEC-Q100 qualified - suitable for under-hood automotive applications and harsh-environment control systems. |
| Voltage Supply | 2.3 V to 3.6 V single supply - interoperable with 3.3 V logic families and low-voltage microcontrollers without level shifters. |
Pinout & Package
Package: 8-contact USON (2 mm × 3 mm), RoHS-compliant, moisture sensitivity level (MSL) 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command sequence - enables multi-device SPI daisy-chaining with independent chip selection. |
| SIO0 / SI | Serial Data Input / Dual I/O | Primary input for commands, addresses, and data; becomes output during Dual I/O reads - supports bidirectional half-duplex operation to double effective throughput. |
| SIO1 / SO | Serial Data Output / Dual I/O | Primary output for read data; becomes input during Dual I/O address phase - allows concurrent address loading and data streaming in BBH mode. |
| SCK | Serial Clock | Edge-triggered timing reference (rising edge for input sampling, falling edge for output shifting) - compatible with both SPI Mode 0 (SCK idle low) and Mode 3 (SCK idle high). |
| WP# | Write Protect | Hardware lock for status register BPL bit; when low, prevents accidental modification of block protection bits - critical for secure firmware write-lockdown in production. |
| HOLD# | Hold | Pauses ongoing SPI transaction without deselecting device - preserves internal state during interrupt servicing or bus arbitration, eliminating re-initialization overhead. |
| VDD | Power Supply | 2.3–3.6 V core supply; decoupling capacitor required within 5 mm - ensures stable operation across wide input range and transient load conditions. |
| VSS | Ground | Reference return path; must be connected to system ground plane with low-inductance trace - minimizes noise coupling into sensitive read operations. |
Key Features
| Feature | Design Value |
|---|---|
| Dual I/O Interface (BBH) | Reduces address transfer time by 50% vs. standard SPI - cuts total read latency for 64-byte config blocks from ~25 µs to ~13 µs at 40 MHz. |
| Flexible Erase Granularity | Independent 4 KByte sector and 64 KByte block erase - permits selective firmware patching without disturbing adjacent application or calibration data. |
| End-of-Write Detection | Software-pollable BUSY bit in status register - eliminates fixed delay waits and enables deterministic timing in real-time OS contexts. |
| Hardware Write Protection | WP# pin controls BPL bit lockdown - prevents runtime corruption of BP0–BP2/TB bits even if software fails, meeting ASIL-B functional safety constraints. |
| Ultra-Low Power-Down Mode | 3 µA standby current - enables <1 µW system sleep power when flash is inactive, critical for energy-harvesting sensor nodes. |
Applications
| Firmware Boot Storage | Industrial Configuration Logging |
|---|---|
|
Use Scenario: Storing bootloader and application firmware images for ARM Cortex-M4 microcontrollers in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Nonvolatile code storage with fast random-access read capability and deterministic 40 MHz instruction fetch timing. Use Value: Enables sub-100 ms cold boot via High-Speed Read mode and supports secure over-the-air (OTA) updates using isolated 4 KByte sector erase. |
Use Scenario: Recording sensor calibration parameters, error logs, and operational timestamps in factory-floor HMIs operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Reliable parameter storage with 100,000-cycle endurance and guaranteed data retention over 15+ years. Use Value: Eliminates need for external EEPROM; leverages 64 KByte block erase to archive monthly logs without degrading adjacent configuration sectors. |
| Automotive ECU Parameter Storage | Medical Device Configuration Archive |
|
Use Scenario: Holding adaptive cruise control tuning maps and fault history in AEC-Q100-compliant engine control units. IC Role / Device Role / Timing Role: Extended-temperature nonvolatile memory with hardware WP#/HOLD# for fail-safe operation during voltage transients. Use Value: Meets ISO 16750-2 pulse test requirements; HOLD# preserves SPI state during ignition noise events, preventing partial writes. |
Use Scenario: Archiving FDA-mandated device calibration certificates and usage counters in portable ultrasound systems. IC Role / Device Role / Timing Role: Tamper-resistant storage with software block-protection (BP0–BP2) and hardware WP# lockdown. Use Value: Enables audit-trail integrity: BPL bit prevents runtime modification of protected certificate sectors, satisfying 21 CFR Part 11 electronic record requirements. |
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 | Same 4 Mbit density, 40 MHz read, 2.7–3.6 V supply; lacks Dual I/O (BBH) mode and HOLD# pin; uses different status register layout. | Acceptable for basic High-Speed Read use cases but cannot replace SST25PF040CT-40E/MF in designs requiring BBH protocol or hold functionality. | Select only if Dual I/O and HOLD# are unused; verify BP bit mapping and erase timing compliance before drop-in substitution. |
| Cypress S25FL004K | 4 Mbit, 50 MHz read, 2.7–3.6 V; supports Quad SPI (QSPI) but not Dual I/O; includes SFDP register; higher active current (8 mA typical). | Suitable for QSPI-capable hosts seeking faster peak bandwidth, but requires PCB layout changes due to different pinout and no HOLD# signal. | Choose for new designs targeting QSPI performance uplift; not recommended for direct replacement due to pin incompatibility and missing HOLD#. |
Compared with W25Q40EW and S25FL004K, the SST25PF040CT-40E/MF uniquely combines Dual I/O (BBH), HOLD#, and extended temperature support in a 2×3 mm USON package - making it irreplaceable in space-constrained, automotive-grade, or interrupt-sensitive applications where protocol flexibility and robustness are mandatory.
Availability
SST25PF040CT-40E/MF is available at Aetrix Electronics and suitable for industrial control systems, automotive electronics, medical diagnostics equipment, and IoT edge gateways requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SST25PF040CT-40E/MF 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 global manufacturing and quality certifications including ISO 9001 and IATF 16949.
The SST25PF040CT-40E/MF belongs to Microchip's Serial Flash 25 Series, engineered for high-reliability embedded systems demanding fast, low-power, and AEC-Q100-qualified nonvolatile storage in compact packages.
FAQ
What is the maximum clock frequency supported by SST25PF040CT-40E/MF for read operations?
The SST25PF040CT-40E/MF supports up to 40 MHz for High-Speed Read (0BH), Fast-Read Dual-Output (3BH), and Fast-Read Dual I/O (BBH) instructions. Standard Read (03H) is limited to 25 MHz. All modes maintain full timing compliance across the full –40°C to +125°C operating range, with setup/hold margins verified per DS20005397E.
Does SST25PF040CT-40E/MF support Quad SPI (QSPI) interface?
No, the SST25PF040CT-40E/MF does not support Quad SPI. It implements a four-wire SPI interface with Dual I/O capability (SIO0/SIO1 used for bidirectional address/data transfer in BBH mode), but lacks dedicated QIO/QPI pins or instruction set support for true quad-data-line operation.
What is the purpose of the HOLD# pin on SST25PF040CT-40E/MF?
The HOLD# pin on SST25PF040CT-40E/MF 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 address and command context - enabling MCU interrupt handling without SPI re-synchronization overhead.
How is write protection implemented on SST25PF040CT-40E/MF?
SST25PF040CT-40E/MF implements dual-layer write protection: hardware via the WP# pin (enabling BPL bit lockdown) and software via BP0–BP2/TB bits in the status register. When WP# is low and BPL = 1, block protection bits become read-only - preventing runtime corruption of protected firmware or calibration sectors.
What package type is used for SST25PF040CT-40E/MF?
The SST25PF040CT-40E/MF is packaged in an 8-contact USON (Ultra Thin Small Outline No-lead) measuring 2 mm × 3 mm, with wettable flank leads for automated optical inspection (AOI). This package is distinct from the SOIC and WDFN variants offered in the same SST25PF040C family.
SST25PF040CT-40E/MF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WDFN (5x6)
SST25PF040CT-40E/MF FAQ
1.How can I place an order for SST25PF040CT-40E/MF through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25PF040CT-40E/MF 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-40E/MF reliable?
The price and inventory of SST25PF040CT-40E/MF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25PF040CT-40E/MF is usually 5 days.
3.What payment methods are accepted for SST25PF040CT-40E/MF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25PF040CT-40E/MF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25PF040CT-40E/MF?
SST25PF040CT-40E/MF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25PF040CT-40E/MF 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-40E/MF?
For technical support, including SST25PF040CT-40E/MF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25PF040CT-40E/MF requirements.
6.How does Aetrix verify that SST25PF040CT-40E/MF is sourced from the original manufacturer or authorized distributors?
All SST25PF040CT-40E/MF 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-40E/MF meets industry standards.
7.What is the process for return or replacement of SST25PF040CT-40E/MF?
All SST25PF040CT-40E/MF units undergo pre-shipment inspection (PSI). If there is an issue with SST25PF040CT-40E/MF, 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-40E/MF part is unused and in its original packaging.
Return procedure for SST25PF040CT-40E/MF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST25PF040CT-40E/MF Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
