My Inquiry
My Account
Microchip Technology SST25WF040BT-40I/NP
- Part No.:
- SST25WF040BT-40I/NP
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
SST25WF040BT-40I/NP.pdf
- Description:
- IC FLASH 4MBIT SPI 40MHZ 8USON
- Quantity:
- Payment:
- Shipping:
Inventory:1,588
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SST25WF040BT-40I/NP from Microchip Technology is a 4 Mbit (512 KByte) 1.8V SPI serial flash memory IC with SuperFlash technology, supporting dual-output and dual I/O read modes up to 40 MHz, 1.65–1.95V single-supply operation, and industrial temperature range (–40°C to +85°C). It serves as nonvolatile program/data storage in microcontroller boot loaders, firmware update buffers, and configuration memory for embedded systems.
For engineers reviewing the SST25WF040BT-40I/NP datasheet, SST25WF040BT-40I/NP pinout, SST25WF040BT-40I/NP application, or SST25WF040BT-40I/NP equivalent, key selection considerations include its 40 MHz high-speed read capability, 256-byte page programming, uniform 4 KByte sector/64 KByte block erase architecture, and dual I/O interface compatibility with space-constrained industrial controllers and IoT edge nodes.
Technical Context
The SST25WF040BT-40I/NP implements a four-wire SPI interface compliant with Mode 0 and Mode 3 protocols, using CE#, SCK, SI/SIO0, and SO/SIO1 pins for command/address/data transfer. Its SuperFlash split-gate cell architecture enables lower programming current and shorter erase times versus conventional NOR flash.
Internal logic includes a software status register with BUSY, WEL, BP0–BP2, TB, and BPL bits for real-time operation monitoring and flexible memory protection. The HOLD# and WP# pins provide hardware-level suspend and write-lock control independent of SPI command flow.
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 |
| Supply Voltage | 1.65–1.95V - enables direct integration with 1.8V logic domains without level-shifting |
| Max Clock Frequency | 40 MHz - supports high-throughput firmware reads via Fast-Read Dual I/O (BBH) instruction |
| Page Size | 256 bytes - defines minimum programmable unit; partial-page writes wrap within boundary |
| Erase Endurance | 100,000 cycles - ensures reliable field updates for firmware patching and parameter logging |
| Data Retention | >20 years at +85°C - guarantees long-term integrity of calibration data and security keys |
| Active Read Current | 4 mA typical - minimizes power draw during boot code execution in battery-backed systems |
Pinout & Package
Package: 8-contact USON (2 mm × 3 mm, 0.45 mm height), RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command sequence; deassertion places device in standby mode |
| SIO0 / SI | Serial Data Input / Dual I/O | Primary input for commands/addresses; functions as even-bit data output (D6,D4,D2,D0) in Dual I/O mode |
| SIO1 / SO | Serial Data Output / Dual I/O | Primary output for read data; functions as odd-bit data output (D7,D5,D3,D1) in Dual I/O mode |
| SCK | Serial Clock | Timing reference; samples inputs on rising edge, drives outputs on falling edge (Mode 0/3 compatible) |
| WP# | Write Protect | Hardware enable for Block-Protection Lock-Down (BPL); low = BPL bit controls status register writability |
| HOLD# | Hold Control | Pauses ongoing SPI transaction without deselecting device; requires CE# low and synchronized SCK edge |
| VDD | Power Supply | 1.65–1.95V supply input; powers all internal logic and memory array |
| VSS | Ground | Reference return path for VDD and all signal pins |
Key Features
| Feature | Design Value |
|---|---|
| Dual I/O Read Interface | Enables 40 MHz data throughput using SIO0/SIO1 bidirectionally for address input and data output - cuts clock cycles by 50% vs standard SPI reads |
| Flexible Erase Architecture | Supports granular 4 KByte sector erase (40 ms typ), 64 KByte block erase (80 ms typ), and full chip erase (400 ms typ) - optimizes firmware update latency and wear leveling |
| Hardware Write Protection | WP# pin directly gates BPL bit functionality, allowing irreversible lockdown of status register BP bits after initial configuration - prevents accidental corruption of protected regions |
| Ultra-Low Standby Power | 2 µA typical in power-down mode - extends battery life in always-on sensor nodes and energy-harvesting devices |
| End-of-Write Detection | BUSY bit polling in status register provides deterministic completion signaling - eliminates need for fixed timing delays in host firmware |
Applications
| Industrial PLC Firmware Storage | IoT Edge Node Configuration Memory |
|---|---|
Use Scenario: Storing boot loader, application firmware, and field-upgradable parameter sets in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast 40 MHz read access enabling sub-100ms cold boot; dual I/O mode reduces SPI bus occupancy during firmware validation. Use Value: Eliminates external level shifters via 1.8V-only operation and withstands –40°C to +85°C ambient - ensuring reliable startup after thermal cycling. |
Use Scenario: Holding device-specific credentials, sensor calibration tables, and OTA update staging buffers in battery-powered wireless sensor gateways. IC Role / Device Role / Timing Role: Low-power configuration store; 2 µA power-down current extends 10-year battery life; 256-byte page programming enables atomic parameter updates. Use Value: Hardware HOLD# allows seamless suspend/resume of SPI transfers during RF transmission bursts - preventing data corruption during concurrent radio activity. |
| Medical Diagnostic Device Boot Memory | Automotive Body Control Module Log Buffer |
Use Scenario: Securely storing certified bootloader images and cryptographic keys in portable ultrasound and ECG analyzers requiring FDA-grade data integrity. IC Role / Device Role / Timing Role: Trusted firmware repository; software write protection (BP bits) + hardware WP# lock-down prevents unauthorized modification of boot code. Use Value: >20-year data retention at +85°C ensures calibration persistence across product lifetime without periodic refresh - meeting ISO 13485 reliability requirements. |
Use Scenario: Capturing fault codes, sensor diagnostics, and event timestamps in automotive body control units subject to extended temperature exposure and vibration. IC Role / Device Role / Timing Role: Robust event log storage; 100,000-cycle endurance supports frequent overwrite of rolling diagnostic buffers; 4 KByte sector erase isolates log updates from firmware partitions. Use Value: Uniform 4 KByte sectors allow precise wear leveling across 128 regions - extending usable life beyond 15 years in 24/7 vehicle operation. |
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, 1.7–2.0V supply, 104 MHz Quad SPI, 8-pin USON (2×3 mm) | Requires Quad SPI controller support; higher max clock but no Dual I/O mode | Select when system uses QSPI peripheral and demands faster random reads; not drop-in for standard SPI hosts |
| Cypress S25FL004K0XMFI011 | 4 Mbit, 2.7–3.6V supply, 85 MHz Quad SPI, 8-pin SOIC (150 mil) | Higher voltage requirement; incompatible with 1.8V logic; larger SOIC package | Choose only if existing board uses 3.3V SPI and SOIC footprint; not suitable for new 1.8V designs |
Compared with W25Q40EWUXIE and S25FL004K0XMFI011, the SST25WF040BT-40I/NP uniquely delivers 40 MHz dual-I/O performance at 1.8V in a compact USON package with hardware HOLD#/WP# pins - making it optimal for space- and power-constrained industrial microcontrollers lacking Quad SPI peripherals.
Availability
SST25WF040BT-40I/NP is available at Aetrix Electronics and suitable for industrial PLC firmware storage, IoT edge node configuration memory, and medical diagnostic device boot memory requiring stable component supply across extended product lifecycles.
Supply support for SST25WF040BT-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 industrial, automotive, and consumer applications.
The SST25WF040BT-40I/NP belongs to Microchip's Serial Flash 25 Series, designed specifically for ultra-low-power, high-reliability embedded systems requiring robust nonvolatile storage in 1.8V domains.
FAQ
What is the maximum clock frequency supported by SST25WF040BT-40I/NP for high-speed read operations?
The SST25WF040BT-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. Standard Read (03H) operates up to 30 MHz. This 40 MHz capability enables rapid firmware loading in time-critical boot sequences while maintaining compatibility with legacy SPI controllers.
Does SST25WF040BT-40I/NP require external voltage translation when interfacing with 1.8V microcontrollers?
No, the SST25WF040BT-40I/NP operates natively from 1.65V to 1.95V, matching standard 1.8V logic levels. Its input thresholds and output drive strength are specified for direct connection to 1.8V GPIOs without level shifters - reducing BOM cost and PCB area in compact embedded designs.
How does the HOLD# pin function during active SPI communication in SST25WF040BT-40I/NP?
The HOLD# pin suspends ongoing SPI transactions without deselecting the device: when asserted low (with CE# active), it places SO in high-impedance state while preserving internal address and command state. Communication resumes upon deasserting HOLD# (high) while CE# remains low - enabling coexistence with shared SPI buses in multi-peripheral systems.
What memory protection mechanisms are implemented in SST25WF040BT-40I/NP?
The SST25WF040BT-40I/NP combines hardware and software protection: WP# pin enables BPL bit lock-down of status register BP0–BP2/TB bits, while those bits configure 1/8 to full-array software write protection. This dual-layer scheme prevents accidental or malicious overwrites of critical firmware or calibration data in deployed systems.
What is the erase granularity and typical timing for SST25WF040BT-40I/NP?
The SST25WF040BT-40I/NP supports three erase granularities: 4 KByte sectors (40 ms typical), 64 KByte blocks (80 ms typical), and full chip (400 ms typical). This hierarchy allows optimized firmware updates - e.g., sector erase for parameter tables, block erase for application binaries - minimizing downtime during field upgrades.
SST25WF040BT-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:
- 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:
- 1ms
- 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-USON (2x3)
SST25WF040BT-40I/NP FAQ
1.How can I place an order for SST25WF040BT-40I/NP through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25WF040BT-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 SST25WF040BT-40I/NP reliable?
The price and inventory of SST25WF040BT-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 SST25WF040BT-40I/NP is usually 5 days.
3.What payment methods are accepted for SST25WF040BT-40I/NP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25WF040BT-40I/NP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25WF040BT-40I/NP?
SST25WF040BT-40I/NP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25WF040BT-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 SST25WF040BT-40I/NP?
For technical support, including SST25WF040BT-40I/NP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25WF040BT-40I/NP requirements.
6.How does Aetrix verify that SST25WF040BT-40I/NP is sourced from the original manufacturer or authorized distributors?
All SST25WF040BT-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 SST25WF040BT-40I/NP meets industry standards.
7.What is the process for return or replacement of SST25WF040BT-40I/NP?
All SST25WF040BT-40I/NP units undergo pre-shipment inspection (PSI). If there is an issue with SST25WF040BT-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 SST25WF040BT-40I/NP part is unused and in its original packaging.
Return procedure for SST25WF040BT-40I/NP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SST25WF040BT-40I/NP 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…
