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Microchip Technology SST25WF040BT-40I/CS
- Part No.:
- SST25WF040BT-40I/CS
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFBGA, CSPBGA
- Datasheet:
-
SST25WF040BT-40I/CS.pdf
- Description:
- IC FLASH 4MBIT SPI 40MHZ 8CSP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SST25WF040BT-40I/CS 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 operations up to 40 MHz. It operates from 1.65–1.95 V, features uniform 4 KByte sectors and 64 KByte blocks, and delivers 100,000 program/erase cycles with >20-year data retention. It is used in embedded firmware storage for industrial microcontrollers requiring low-voltage, high-reliability nonvolatile memory.
For engineers reviewing the SST25WF040BT-40I/CS datasheet, SST25WF040BT-40I/CS pinout, SST25WF040BT-40I/CS application, or SST25WF040BT-40I/CS equivalent, key selection considerations include its 1.65–1.95 V single-supply operation, dual-output/fast-read dual I/O support (3BH/BBH), 256-byte page programming, hardware HOLD#/WP# pins, and industrial temperature range (–40°C to +85°C).
Technical Context
The SST25WF040BT-40I/CS implements a four-wire SPI interface compliant with Mode 0 and Mode 3 timing, using CE#, SCK, SI/SIO0, and SO/SIO1 signals. Its SuperFlash split-gate cell architecture enables lower programming current and shorter erase times versus conventional NOR flash.
It supports three read modes - standard Read (03H, 30 MHz), High-Speed Read (0BH, 40 MHz), and dual-output variants (3BH and BBH, both 40 MHz) - with automatic address wraparound and software polling via BUSY bit (Status Register Bit 0) for end-of-write detection.
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 | 1.65–1.95 V - enables direct interfacing with 1.8 V logic systems without level shifting |
| Max Clock Frequency | 40 MHz - supports high-throughput firmware reads in resource-constrained MCUs |
| Page Size | 256 bytes - defines minimum programmable unit; partial-page writes are ignored |
| Erase Endurance | 100,000 cycles - ensures long-term field reliability for infrequently updated configuration or boot code |
| Data Retention | >20 years at +85°C - validated retention under industrial thermal stress conditions |
| Active Read Current | 4 mA typical at 40 MHz - enables low-power operation during active firmware execution |
| Standby Current | 7 µA typical; 2 µA in power-down mode - critical for battery-backed or energy-harvesting applications |
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 sequences; high state places device in standby |
| SIO0 / SI | Serial Data Input / Dual I/O | Primary input for commands/addresses/data; 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; supports Mode 0 and Mode 3 |
| WP# | Write Protect | Hardware lock for status register Block-Protection-Lock (BPL) bit; enables lockdown of BP0–BP2/TB bits when pulled low |
| HOLD# | Hold | Pauses ongoing SPI transaction without deselecting device; requires CE# low and synchronized SCK edge transitions |
| VDD | Power Supply | 1.65–1.95 V supply input; powers internal logic and memory array; no external regulator required |
| VSS | Ground | Reference return path for all digital and memory circuitry; must be low-impedance connection |
Key Features
| Feature | Design Value |
|---|---|
| Dual I/O Fast-Read Support (3BH/BBH) | Enables 40 MHz read throughput with reduced clock cycles per byte - cuts instruction latency by ~50% vs standard SPI read |
| Uniform Sector & Block Erase | 4 KByte sectors and 64 KByte blocks allow granular firmware updates without erasing full image - minimizes wear and downtime |
| Hardware HOLD# and WP# Pins | Allow real-time transaction suspension and nonvolatile block protection configuration without software overhead or register access |
| SuperFlash Technology | Delivers lower total energy per program/erase cycle due to reduced current and shorter timing - extends system battery life |
| Industrial Temperature Range | –40°C to +85°C operation validated across voltage and timing margins - suitable for uncontrolled ambient deployments |
Applications
| Firmware Storage for Industrial MCU | Secure Boot Code Storage |
|---|---|
Use Scenario: Storing bootloader and application firmware in a programmable logic controller (PLC) with field-upgrade capability. IC Role / Device Role / Timing Role: Nonvolatile storage for executable code executed directly or copied to RAM; accessed via SPI during cold start and OTA updates. Use Value: 40 MHz dual-I/O read speed reduces boot time; 100K endurance supports frequent firmware revisions over 10+ year product lifecycle. |
Use Scenario: Holding immutable root-of-trust code in a medical diagnostic device requiring regulatory compliance. IC Role / Device Role / Timing Role: Tamper-resistant storage for signed boot images; write-protected via hardware WP# and status register BPL lock. Use Value: Hardware-enforced block protection prevents accidental or malicious overwrite; >20-year data retention ensures integrity across device service life. |
| Configuration Data Logging | IoT Edge Sensor Firmware Cache |
Use Scenario: Recording calibration parameters and fault logs in an automotive-grade telematics gateway. IC Role / Device Role / Timing Role: Persistent parameter storage with sector-level erase granularity to preserve logs across firmware updates. Use Value: Uniform 4 KByte sectors enable independent update of config/log regions; 7 µA standby current minimizes battery drain during sleep. |
Use Scenario: Caching firmware patches for wireless sensor nodes operating on coin-cell batteries. IC Role / Device Role / Timing Role: Low-voltage (1.65–1.95 V) flash buffer for OTA payloads; accessed only during scheduled maintenance windows. Use Value: 2 µA power-down mode extends node lifetime; 256-byte page programming allows efficient patch fragment writes. |
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 density (4 Mbit), 1.7–2.0 V supply, 104 MHz dual/quad SPI, but lacks HOLD# pin and uses different status register protection scheme | Higher bandwidth for quad-SPI host interfaces; not drop-in compatible due to pinout and command set differences | Select W25Q40EW only if host supports quad I/O and board layout accommodates different pin mapping and voltage tolerance |
| Cypress S25FL004A | 4 Mbit, 2.7–3.6 V supply, 50 MHz SPI, includes legacy CFI-compatible command set; no dual-I/O mode or 1.8 V operation | Requires level-shifting for 1.8 V systems; suited for legacy designs migrating from parallel NOR flash | Choose S25FL004A only for backward compatibility with existing 3.3 V designs; not suitable for new 1.8 V low-power applications |
Compared with W25Q40EW and S25FL004A, the SST25WF040BT-40I/CS uniquely combines 1.8 V operation, hardware HOLD#/WP# pins, and dual-I/O 40 MHz performance in a 2×3 mm USON package - making it optimal for space-constrained, battery-aware industrial firmware storage where voltage headroom and real-time transaction control are critical.
Availability
SST25WF040BT-40I/CS is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, automotive telematics gateways, and IoT edge sensor nodes requiring stable component supply across extended product lifecycles.
Supply support for SST25WF040BT-40I/CS 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 a focus on industrial, automotive, and aerospace reliability standards.
The SST25WF040BT-40I/CS belongs to Microchip's Serial Flash 25 Series, designed specifically for low-voltage, high-reliability embedded firmware and configuration storage in space- and power-constrained applications.
FAQ
What is the operating voltage range of the SST25WF040BT-40I/CS?
The SST25WF040BT-40I/CS operates from 1.65 V to 1.95 V - a true single-supply 1.8 V interface. This eliminates the need for external level shifters when interfacing with 1.8 V microcontrollers or FPGAs. Operation outside this range may cause undefined behavior or permanent damage. The SST25WF040BT-40I/CS is not rated for 3.3 V operation.
Does the SST25WF040BT-40I/CS support Quad SPI mode?
No, the SST25WF040BT-40I/CS does not support Quad SPI. It supports standard SPI (single I/O), Fast-Read Dual-Output (3BH), and Fast-Read Dual I/O (BBH) modes only. Quad SPI functionality requires four data lines (IO0–IO3), which the SST25WF040BT-40I/CS does not implement. Its dual I/O capability uses only SIO0 and SIO1 for bidirectional data transfer.
How is write protection implemented on the SST25WF040BT-40I/CS?
The SST25WF040BT-40I/CS implements layered write protection: hardware via the WP# pin (enabling BPL bit lockdown), and software via Block-Protection bits (BP0–BP2, TB) in the status register. When WP# is low and BPL = 1, the BP bits become read-only. Protection granularity ranges from 1/8 to full memory array, configurable per Table 4-3 in the datasheet. The SST25WF040BT-40I/CS does not support sector-lockdown independent of the status register.
What is the maximum clock frequency for dual-I/O read operations on the SST25WF040BT-40I/CS?
The SST25WF040BT-40I/CS supports dual-I/O read operations at up to 40 MHz using the Fast-Read Dual I/O instruction (0xBB). This applies to both Fast-Read Dual-Output (0x3B) and Fast-Read Dual I/O (0xBB) modes. At 40 MHz, the effective data rate reaches 10 MB/s (2 bits/clock × 40 MHz ÷ 8), doubling the throughput of standard SPI reads at the same clock frequency. The SST25WF040BT-40I/CS does not support higher frequencies in any mode.
Is the SST25WF040BT-40I/CS pin-compatible with other members of the SST25WF040B family?
Yes, the SST25WF040BT-40I/CS shares identical pinout and electrical characteristics with other variants in the SST25WF040B family, including SST25WF040BT-40I/SO (SOIC-8) and SST25WF040BT-40I/QM (USON-8). All share the same 8-pin USON footprint, signal mapping, and timing specifications. Differences are limited to packaging and temperature grade - the "T" suffix denotes tape-and-reel packaging, and "I" indicates industrial temperature range (–40°C to +85°C).
SST25WF040BT-40I/CS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-UFBGA, CSPBGA
- 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-CSP
SST25WF040BT-40I/CS FAQ
1.How can I place an order for SST25WF040BT-40I/CS through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25WF040BT-40I/CS 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/CS reliable?
The price and inventory of SST25WF040BT-40I/CS 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/CS is usually 5 days.
3.What payment methods are accepted for SST25WF040BT-40I/CS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25WF040BT-40I/CS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25WF040BT-40I/CS?
SST25WF040BT-40I/CS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25WF040BT-40I/CS 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/CS?
For technical support, including SST25WF040BT-40I/CS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25WF040BT-40I/CS requirements.
6.How does Aetrix verify that SST25WF040BT-40I/CS is sourced from the original manufacturer or authorized distributors?
All SST25WF040BT-40I/CS 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/CS meets industry standards.
7.What is the process for return or replacement of SST25WF040BT-40I/CS?
All SST25WF040BT-40I/CS units undergo pre-shipment inspection (PSI). If there is an issue with SST25WF040BT-40I/CS, 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/CS part is unused and in its original packaging.
Return procedure for SST25WF040BT-40I/CS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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