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Microchip Technology SST25WF040BT-40E/SN
- Part No.:
- SST25WF040BT-40E/SN
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SST25WF040BT-40E/SN.pdf
- Description:
- IC FLASH 4MBIT SPI 40MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,393
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Product details
Overview
SST25WF040BT-40E/SN from Microchip Technology is a 4 Mbit (512 KByte) 1.8V SPI serial flash memory IC with SuperFlash technology, supporting dual I/O and fast-read modes up to 40 MHz. It operates from 1.65–1.95 V, delivers 4 mA typical active read current, and features uniform 4 KByte sectors and 64 KByte overlay blocks for flexible firmware storage in space-constrained embedded systems.
For engineers reviewing the SST25WF040BT-40E/SN datasheet, SST25WF040BT-40E/SN pinout, SST25WF040BT-40E/SN application, or SST25WF040BT-40E/SN equivalent, key selection criteria include single-supply 1.8V operation, industrial temperature range (–40°C to +85°C), SOIC-8 package compatibility, dual-output/fast-read instruction support (3BH/BBH), and software/hardware write protection via WP# and HOLD# pins.
Technical Context
The SST25WF040BT-40E/SN implements a four-wire SPI interface compliant with Mode 0 and Mode 3, using CE#, SCK, SI/SIO0, and SO/SIO1 signals. Its SuperFlash split-gate cell architecture enables lower program/erase energy versus conventional flash, with verified 100,000 endurance cycles and >20-year data retention.
It supports three high-speed read protocols: standard Read (03H, up to 30 MHz), High-Speed Read (0BH, up to 40 MHz with dummy cycle), and dual-mode Fast-Read Dual Output (3BH) and Fast-Read Dual I/O (BBH), both operating at 40 MHz and doubling effective throughput by leveraging SIO0/SIO1 bidirectional data lanes.
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 updates without full chip erase. |
| Supply Voltage | 1.65–1.95 V - compatible with modern low-voltage microcontrollers and eliminates need for level shifters in 1.8V systems. |
| Max Clock Frequency | 40 MHz - supports high-throughput boot code loading and real-time parameter logging in resource-constrained hosts. |
| Page Size | 256 bytes - aligns with common MCU cache line sizes and simplifies buffer management in bootloader implementations. |
| Endurance & Retention | 100,000 program/erase cycles; >20 years data retention - validated for long-life industrial control and automotive infotainment firmware storage. |
| Active Read Current | 4 mA (typical at 40 MHz) - enables low-power operation in battery-backed or energy-harvesting applications. |
| Standby Current | 7 µA (typical); 2 µA in power-down mode - critical for always-on IoT edge nodes requiring multi-year battery life. |
Pinout & Package
Package: 8-lead SOIC (150 mil), RoHS-compliant, industrial temperature grade (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE# | Chip Enable | Active-low device select; must remain low throughout command sequences - enables multi-device SPI bus sharing with hardware address decoding. |
| SCK | Serial Clock | Timing reference for all SPI transfers; rising edge latches input (SI/SIO0), falling edge outputs data (SO/SIO1) - supports both Mode 0 and Mode 3 clock polarity/idle states. |
| SI / SIO0 | Serial Data Input / Dual I/O Lane 0 | Primary input for commands, addresses, and data; functions as bidirectional lane 0 in Dual I/O mode - reduces address/data transfer time by 2× vs. standard SPI. |
| SO / SIO1 | Serial Data Output / Dual I/O Lane 1 | Primary output for read data; functions as bidirectional lane 1 in Dual I/O mode - enables simultaneous 2-bit-per-clock address input and 2-bit-per-clock data output. |
| WP# | Write Protect | Hardware lock for status register BPL bit; when low, prevents modification of block-protection bits unless BPL=0 - ensures immutable firmware partitioning in certified safety systems. |
| HOLD# | Hold | Pauses ongoing SPI transaction without deselecting device - allows host CPU to service higher-priority interrupts while preserving flash state and clock alignment. |
| VDD | Power Supply | 1.65–1.95 V supply input - requires local 1.8V LDO or DC-DC; no external voltage translation needed. |
| VSS | Ground | Reference return path for all I/O and core logic - must be low-impedance connection to minimize noise coupling into sensitive read operations. |
Key Features
| Feature | Design Value |
|---|---|
| Dual I/O Fast-Read (BBH) | Reduces 24-bit address + data transfer time by 50% vs. standard SPI, accelerating firmware validation and OTA update staging. |
| Flexible Block Protection | Software-configurable BP0–BP2/TB bits enable selective write-lock of top/bottom 1/8, 1/4, or 1/2 memory regions - supports secure bootloader + application partitioning. |
| SuperFlash Technology | Split-gate cell design cuts erase energy by >50% and shortens sector-erase time to 40 ms (typical) - extends battery life and improves field update responsiveness. |
| HOLD# Pin Functionality | Preserves internal state during host interrupt latency, eliminating need for retransmission or command re-synchronization - critical for deterministic real-time systems. |
| Industrial Temperature Range | Rated –40°C to +85°C - qualified for deployment in automotive body controllers, industrial PLCs, and outdoor metering equipment without derating. |
Applications
| Firmware Storage in Microcontroller Bootloader | Secure Configuration Parameter Storage |
|---|---|
Use Scenario: Storing immutable bootloader code and signed application images in a Cortex-M4-based motor controller. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast 40 MHz read access and hardware write protection to prevent accidental corruption during field firmware updates. Use Value: Enables secure over-the-air (OTA) updates with verified signature checking, leveraging 4 KByte sector erase granularity to minimize update window and system downtime. |
Use Scenario: Retaining calibrated sensor offsets and user preferences in a medical infusion pump with battery backup. IC Role / Device Role / Timing Role: Low-power configuration memory accessed only during startup or maintenance mode, with WP#-enabled lockdown after factory calibration. Use Value: Guarantees parameter integrity across 10+ years of operation using <2 µA power-down current and >20-year data retention - meets IEC 62304 Class C requirements. |
| Industrial HMI Display Asset Storage | Wireless Edge Node Firmware Caching |
Use Scenario: Hosting GUI assets (fonts, icons, bitmaps) for an ARM9-based human-machine interface panel in factory automation. IC Role / Device Role / Timing Role: High-bandwidth serial flash interfaced via dual-output mode (3BH) to sustain 8 MB/s display refresh without CPU bottlenecks. Use Value: Eliminates external parallel NOR flash, reducing PCB area by 60% and BOM cost while maintaining sub-100 ms UI asset load times. |
Use Scenario: Caching firmware fragments for LoRaWAN end-nodes powered by solar harvesters with intermittent energy availability. IC Role / Device Role / Timing Role: Ultra-low standby current (7 µA typical) and fast page-program (0.8 ms/256B) enable reliable fragmented writes during brief energy windows. Use Value: Supports robust field-upgrade capability in energy-constrained environments where traditional flash would fail due to insufficient charge accumulation. |
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, 1.7–1.95 V, 104 MHz quad SPI, USON-8 package only - lacks dual I/O mode and SOIC option. | Requires quad-capable host controller; unsuitable for legacy SPI-only designs or SOIC-restricted layouts. | Select if host supports QSPI and board space is constrained; avoid if pinout compatibility with existing SOIC footprint is required. |
| Cypress S25FL004KAGMFI011 | 4 Mbit, 2.7–3.6 V, 85 MHz, SOIC-8 - incompatible voltage range and no 1.8V support. | Cannot replace SST25WF040BT-40E/SN in 1.8V systems without level-shifting circuitry and layout revision. | Only viable in 3.3V designs with identical SOIC-8 footprint; not a functional substitute for 1.8V applications. |
Compared with W25Q40EWUXIE and S25FL004KAGMFI011, the SST25WF040BT-40E/SN uniquely combines 1.8V operation, SOIC-8 packaging, dual I/O support, and industrial temperature rating - making it the sole drop-in solution for space- and voltage-constrained embedded boot memory where hardware write protection and hold functionality are mandatory.
Availability
SST25WF040BT-40E/SN is available at Aetrix Electronics and suitable for industrial control systems, medical device boot storage, and automotive body electronics requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.
Supply support for SST25WF040BT-40E/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 a focus on reliability, low-power design, and long-term product availability for industrial and automotive markets.
The SST25WF040BT-40E/SN belongs to Microchip's Serial Flash 25 Series, engineered specifically for ultra-low-voltage embedded systems requiring robust, high-density nonvolatile storage with minimal power and board space overhead.
FAQ
What is the operating voltage range of the SST25WF040BT-40E/SN?
The SST25WF040BT-40E/SN operates from 1.65 V to 1.95 V, optimized for 1.8 V systems. This single-supply range eliminates the need for external level shifters when interfacing with modern low-voltage MCUs. Operation outside this range may cause unreliable read/write behavior or permanent damage. The SST25WF040BT-40E/SN datasheet specifies strict voltage tolerances to ensure SuperFlash cell integrity during programming and erasure.
Does the SST25WF040BT-40E/SN support quad SPI mode?
No, the SST25WF040BT-40E/SN does not support quad SPI. It supports standard SPI (Mode 0/3), Fast-Read Dual Output (3BH), and Fast-Read Dual I/O (BBH) - all using two I/O lines (SIO0/SIO1). Quad mode requires four data lines and is not implemented in the SST25WF040BT-40E/SN architecture. Host firmware must use dual-mode instructions to achieve 40 MHz throughput without quad-capable hardware.
How is write protection implemented on the SST25WF040BT-40E/SN?
The SST25WF040BT-40E/SN implements layered 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. The SST25WF040BT-40E/SN allows fine-grained protection of top/bottom memory regions (1/8 to 1/2) without affecting unprotected zones - essential for bootloader/application separation.
What is the maximum clock frequency supported by the SST25WF040BT-40E/SN in dual I/O mode?
The SST25WF040BT-40E/SN supports up to 40 MHz in Fast-Read Dual I/O mode (instruction BBH), matching its maximum rated SCK frequency. At this rate, address and data are transferred at two bits per clock cycle on SIO0/SIO1, effectively doubling bandwidth versus standard SPI. The SST25WF040BT-40E/SN timing specifications guarantee setup/hold margins at 40 MHz across the full industrial temperature range.
Is the SST25WF040BT-40E/SN pin-compatible with other members of the SST25WF series?
Yes, the SST25WF040BT-40E/SN is pin-compatible with other 8-lead SOIC variants in the SST25WF family (e.g., SST25WF020B, SST25WF080B), sharing identical pinout, voltage range, instruction set, and timing. This allows density scalability within the same PCB footprint. The SST25WF040BT-40E/SN maintains backward compatibility with existing SST25WF hardware designs while delivering 4 Mbit capacity and enhanced dual-mode performance.
SST25WF040BT-40E/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:
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SST25WF040BT-40E/SN FAQ
1.How can I place an order for SST25WF040BT-40E/SN through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25WF040BT-40E/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 SST25WF040BT-40E/SN reliable?
The price and inventory of SST25WF040BT-40E/SN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25WF040BT-40E/SN is usually 5 days.
3.What payment methods are accepted for SST25WF040BT-40E/SN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25WF040BT-40E/SN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25WF040BT-40E/SN?
SST25WF040BT-40E/SN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25WF040BT-40E/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 SST25WF040BT-40E/SN?
For technical support, including SST25WF040BT-40E/SN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25WF040BT-40E/SN requirements.
6.How does Aetrix verify that SST25WF040BT-40E/SN is sourced from the original manufacturer or authorized distributors?
All SST25WF040BT-40E/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 SST25WF040BT-40E/SN meets industry standards.
7.What is the process for return or replacement of SST25WF040BT-40E/SN?
All SST25WF040BT-40E/SN units undergo pre-shipment inspection (PSI). If there is an issue with SST25WF040BT-40E/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 SST25WF040BT-40E/SN part is unused and in its original packaging.
Return procedure for SST25WF040BT-40E/SN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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