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Microchip Technology SST25VF040B-50-4I-S2AE-T
- Part No.:
- SST25VF040B-50-4I-S2AE-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SST25VF040B-50-4I-S2AE-T.pdf
- Description:
- IC FLASH 4MBIT SPI 50MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,835
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Product details
Overview
SST25VF040B-50-4I-S2AE-T from Microchip Technology is a 4-Mbit SPI serial Flash memory IC designed for embedded firmware storage and code execution in resource-constrained systems. It operates from a single 2.7V–3.6V supply, supports up to 50 MHz clock frequency, delivers 100,000 program/erase cycles endurance, and retains data for >100 years. It is used in industrial microcontroller boot loaders requiring reliable, low-pin-count nonvolatile storage.
For engineers reviewing the SST25VF040B-50-4I-S2AE-T datasheet, SST25VF040B-50-4I-S2AE-T pinout, SST25VF040B-50-4I-S2AE-T application, or SST25VF040B-50-4I-S2AE-T equivalent, key selection criteria include SPI Mode 0/3 compatibility, 4-Kbyte sector erase granularity, Auto Address Increment (AAI) programming support, HOLD#/WP# hardware control, and industrial temperature range (-40°C to +85°C) operation.
Technical Context
The SST25VF040B-50-4I-S2AE-T implements a four-wire SPI interface with dual-mode clock polarity support (Mode 0 and Mode 3), enabling interoperability with diverse host controllers. Its SuperFlash® technology uses a split-gate cell architecture with thick-oxide tunneling injector, delivering faster erase times (18 ms sector erase) and lower active current (10 mA typical) than conventional NOR Flash.
It integrates configurable software write protection via STATUS register BP bits and hardware lock-down via WP#, plus HOLD# for pausing ongoing SPI transactions without chip deselection. End-of-write detection is supported both by polling the BUSY bit and by hardware RY/BY# status output on SO during AAI programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512 Kbytes), organized as uniform 4-Kbyte sectors, 32-Kbyte and 64-Kbyte overlay blocks |
| Supply Voltage | 2.7V–3.6V - enables direct connection to 3.3V logic rails without level-shifting |
| Max Clock Frequency | 50 MHz - supports high-speed read via High-Speed Read instruction (0BH) with dummy cycle |
| Endurance | 100,000 program/erase cycles - sufficient for frequent firmware updates in field-deployed devices |
| Data Retention | Greater than 100 years - ensures long-term reliability in unattended industrial applications |
| Erase Times | Sector/Block Erase: 18 ms typ; Chip Erase: 35 ms typ - reduces firmware update latency |
| Power Consumption | Active Read: 10 mA typ; Standby: 5 µA typ - critical for battery-backed or energy-harvesting systems |
Pinout & Package
Package: 8-contact WSON (6 mm × 5 mm), 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 sequence to prevent premature termination |
| SO | Serial Data Output / RY/BY# (in AAI mode) | Outputs data on falling SCK edge; reconfigurable as ready/busy indicator during AAI programming |
| WP# | Write-Protect Input | Enables STATUS register lock-down (BPL bit); disables software block protection modification when pulled low |
| VSS | Ground | Reference return path for all digital and analog circuitry; requires low-impedance PCB connection |
| VDD | Power Supply | Single 2.7V–3.6V supply input; decoupling capacitor required near pin for stable operation |
| HOLD# | Hold Control | Suspends ongoing SPI transaction without resetting internal state; requires CE# low and synchronized SCK edge alignment |
| SCK | Serial Clock | Timing reference for all SPI transfers; rising edge latches inputs (SI), falling edge outputs data (SO) |
| SI | Serial Data Input | Accepts commands, addresses, and data MSb-first; sampled on rising SCK edge |
Key Features
| Feature | Design Value |
|---|---|
| Auto Address Increment (AAI) Programming | Reduces multi-byte programming time by eliminating repeated address transmission - critical for fast firmware patching |
| Flexible Erase Granularity | Supports 4-Kbyte sectors, 32-Kbyte blocks, and 64-Kbyte blocks - enables precise wear leveling and partial image updates |
| Dual SPI Mode Compatibility | Operates in both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) - ensures drop-in compatibility with diverse MCU SPI peripherals |
| Hardware Write Protection Lock-Down | WP# pin enables irreversible BPL bit setting - prevents accidental or malicious corruption of block protection configuration |
| HOLD# Pin Functionality | Pauses SPI communication mid-sequence without resetting internal address pointer - preserves context during interrupt servicing |
Applications
| Firmware Boot Storage | Industrial PLC Configuration |
|---|---|
Use Scenario: Stores boot code and initial firmware for ARM Cortex-M microcontrollers in factory automation controllers. IC Role / Device Role / Timing Role: Nonvolatile code storage with XIP-capable read performance; provides deterministic startup timing via 50 MHz High-Speed Read. Use Value: Enables secure, fast boot from external Flash while minimizing PCB footprint via 8-pin WSON package. | Use Scenario: Holds user-defined ladder logic configurations and calibration parameters in programmable logic controllers operating in harsh environments. IC Role / Device Role / Timing Role: Industrial-grade parameter storage with -40°C to +85°C operation and 100-year data retention. Use Value: Guarantees configuration persistence across power cycles and thermal stress without backup batteries. |
| Medical Device Firmware Update | Smart Sensor Node Code Storage |
Use Scenario: Hosts field-upgradable firmware images for FDA-cleared diagnostic instruments requiring audit-trail-capable storage. IC Role / Device Role / Timing Role: Secure firmware repository supporting AAI programming and hardware/software write protection. Use Value: Allows safe over-the-air updates with verified block integrity and protected bootloader region. | Use Scenario: Stores sensor fusion algorithms and OTA update payloads in battery-powered wireless environmental monitors. IC Role / Device Role / Timing Role: Low-power nonvolatile memory with 5 µA standby current and sector-erase flexibility for incremental updates. Use Value: Extends battery life while enabling robust firmware maintenance in remote deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25DF041A-SSH-T | 4-Mbit SPI Flash; 85 MHz max clock; 2.7–3.6V; 100k cycles; but lacks HOLD# pin and AAI programming | Higher speed read but no hardware hold capability - unsuitable for interrupt-sensitive real-time boot sequences | Select only if maximum read bandwidth is prioritized over transaction suspension and fast multi-byte writes |
| W25Q40EWUXIE | 4-Mbit SPI Flash; 133 MHz Dual/Quad SPI; 1.65–1.95V/2.7–3.6V dual supply; includes Quad SPI mode and SFDP support | Requires Quad-capable host controller; incompatible with legacy SPI-only designs; offers higher density scalability | Choose for new designs targeting future-proofing and higher throughput; not a drop-in replacement due to voltage and interface differences |
Compared with AT25DF041A-SSH-T and W25Q40EWUXIE, the SST25VF040B-50-4I-S2AE-T uniquely balances industrial temperature operation, HOLD#/WP# hardware controls, AAI programming efficiency, and strict SPI Mode 0/3 compatibility - making it optimal for cost-sensitive, interrupt-aware embedded boot systems where pin count and proven reliability are primary constraints.
Availability
SST25VF040B-50-4I-S2AE-T is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic boot loaders, smart sensor nodes, and factory automation HMI panels requiring stable component supply across extended product lifecycles.
Supply support for SST25VF040B-50-4I-S2AE-T 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 Inc. is a leading provider of microcontrollers, analog components, and Flash memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The SST25VF040B-50-4I-S2AE-T belongs to Microchip's 25-series Serial Flash family, engineered specifically for cost-effective, low-pin-count firmware storage in industrial, automotive, and consumer embedded systems demanding high reliability and long-term data integrity.
FAQ
What is the operating temperature range of the SST25VF040B-50-4I-S2AE-T?
The SST25VF040B-50-4I-S2AE-T is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the official Microchip datasheet DS20005051E, page 1, under "Temperature Range". The 'I' suffix in the part number explicitly denotes industrial grade, distinguishing it from commercial-grade variants ('C', 0°C to +70°C). This makes SST25VF040B-50-4I-S2AE-T suitable for deployment in factory floors, outdoor equipment, and other thermally demanding environments where ambient conditions exceed commercial limits.
Does the SST25VF040B-50-4I-S2AE-T support both SPI Mode 0 and Mode 3?
Yes, the SST25VF040B-50-4I-S2AE-T explicitly supports both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), as stated in the "Features" section of DS20005051E, page 1. This dual-mode compatibility allows seamless integration with a wide range of microcontrollers - including those with fixed SPI polarity/phase settings - without requiring hardware modifications or protocol translation. The device samples SI on the rising edge and drives SO on the falling edge in both modes, ensuring consistent timing behavior regardless of selected mode.
What erase granularities does the SST25VF040B-50-4I-S2AE-T support?
The SST25VF040B-50-4I-S2AE-T supports three distinct erase granularities: uniform 4-Kbyte sectors, 32-Kbyte overlay blocks, and 64-Kbyte overlay blocks. This is documented in the "Features" list (page 1) and elaborated in Section 3.0 ("Memory Organization") of DS20005051E. Each granularity serves a specific purpose: 4-Kbyte sectors enable fine-grained updates (e.g., parameter tables), while larger blocks allow efficient bulk erasure of firmware images. All erase operations are self-timed, with typical durations of 18 ms per sector/block and 35 ms for full chip erase.
How does the HOLD# pin function on the SST25VF040B-50-4I-S2AE-T?
The HOLD# pin on the SST25VF040B-50-4I-S2AE-T suspends an ongoing SPI transaction without deselecting the device or resetting internal state. As defined in Section 4.1 and Figure 4-2 of DS20005051E, HOLD# activation requires CE# to be low and synchronization with the SCK active-low state. During hold, SO enters high-impedance while SI and SCK remain controllable. This feature is essential for real-time systems where MCU interrupts must service higher-priority tasks without corrupting Flash access - a capability not present in many competing 4-Mbit serial Flash devices.
What is the purpose of Auto Address Increment (AAI) programming in the SST25VF040B-50-4I-S2AE-T?
Auto Address Increment (AAI) programming in the SST25VF040B-50-4I-S2AE-T eliminates the need to resend the address for each subsequent word during sequential programming. As described in Section 4.3.3 and Figure 5-6 of DS20005051E, after issuing the AAI command (ADH) and initial address, two data bytes are loaded per cycle - D0 at [A23–A1] + A0=0 and D1 at [A23–A1] + A0=1 - with automatic address advancement. This reduces total programming time significantly versus standard byte programming, especially during full-image firmware updates, and is a distinguishing feature of the SST25VF040B-50-4I-S2AE-T within its density class.
SST25VF040B-50-4I-S2AE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SST25
- Package/Case:
- 8-SOIC (0.209", 5.30mm 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:
- 50 MHz
- Write Cycle Time - Word, Page:
- 10µs
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
SST25VF040B-50-4I-S2AE-T FAQ
1.How can I place an order for SST25VF040B-50-4I-S2AE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for SST25VF040B-50-4I-S2AE-T 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 SST25VF040B-50-4I-S2AE-T reliable?
The price and inventory of SST25VF040B-50-4I-S2AE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SST25VF040B-50-4I-S2AE-T is usually 5 days.
3.What payment methods are accepted for SST25VF040B-50-4I-S2AE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SST25VF040B-50-4I-S2AE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SST25VF040B-50-4I-S2AE-T?
SST25VF040B-50-4I-S2AE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SST25VF040B-50-4I-S2AE-T 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 SST25VF040B-50-4I-S2AE-T?
For technical support, including SST25VF040B-50-4I-S2AE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SST25VF040B-50-4I-S2AE-T requirements.
6.How does Aetrix verify that SST25VF040B-50-4I-S2AE-T is sourced from the original manufacturer or authorized distributors?
All SST25VF040B-50-4I-S2AE-T 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 SST25VF040B-50-4I-S2AE-T meets industry standards.
7.What is the process for return or replacement of SST25VF040B-50-4I-S2AE-T?
All SST25VF040B-50-4I-S2AE-T units undergo pre-shipment inspection (PSI). If there is an issue with SST25VF040B-50-4I-S2AE-T, 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 SST25VF040B-50-4I-S2AE-T part is unused and in its original packaging.
Return procedure for SST25VF040B-50-4I-S2AE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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