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Microchip Technology AT25FS040N-SH27-T
- Part No.:
- AT25FS040N-SH27-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25FS040N-SH27-T.pdf
- Description:
- IC FLASH 4MBIT SPI 50MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,281
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Product details
Overview
AT25FS040N-SH27-T from Microchip Technology is a 4 Mbit (524,288 × 8) serial SPI Flash memory IC optimized for low-voltage industrial applications. It operates from 2.7V to 3.6V, supports 50 MHz clock rate, uses SPI Modes 0 and 3, and features sector/block/page erase architecture with hardware/software write protection via WP pin and status register.
For engineers reviewing the AT25FS040N-SH27-T datasheet, AT25FS040N-SH27-T pinout, AT25FS040N-SH27-T application, or AT25FS040N-SH27-T equivalent, this page delivers verified electrical specs, JEDEC SOIC-8 package mapping, real-world timing behavior (tBPC = 30 µs/byte), endurance (10,000 cycles), and functional alternatives for embedded firmware storage, boot code retention, and configuration data logging.
Technical Context
The AT25FS040N-SH27-T implements a synchronous slave SPI interface with separate SI/SO lines, fixed MSB-first data framing, and automatic address incrementing during sequential reads. Its internal architecture comprises eight uniform 64 Kbyte blocks, each containing sixteen 4 Kbyte sectors and 256-byte pages - enabling granular erase granularity down to 4 Kbyte.
All write operations (PROGRAM, SECTOR ERASE, BLOCK ERASE, CHIP ERASE, WRSR) require prior WREN instruction activation and are self-timed; status is monitored via RDSR bit 0 (RDY/BUSY). Hardware write protection is enabled only when WPEN=1 and WP pin is low, while software protection configures BP[4:0] bits to lock upper 1/64 to full array.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4,194,304 bits (524,288 × 8), sufficient for firmware images up to ~512 KB in size |
| Supply Voltage Range | 2.7 V to 3.6 V - compatible with 3.3 V logic systems and tolerant of brown-out conditions |
| Max Clock Frequency | 50 MHz - enables fast read throughput up to 6.25 MB/s in FAST READ mode |
| Byte Program Time | 30 µs typical - determines minimum latency per byte written without page buffering |
| Sector Erase Time | 50–200 ms - defines time budget for updating configuration sectors without system stall |
| Endurance | 10,000 write/erase cycles - supports field-updatable firmware with moderate reprogramming frequency |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and sensor nodes |
Pinout & Package
AT25FS040N-SH27-T is packaged in an 8-lead JEDEC-standard SOIC (150 mil width), pin-compatible with legacy SPI Flash devices and suitable for automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be stable before SCK edge; controls SO high-impedance state |
| SCK | Serial Clock Input | Master-generated clock; defines timing for SI sampling and SO output (SPI Mode 0/3) |
| SI | Serial Data Input | Receives op-codes, addresses, and program data; MSB-first, sampled on SCK rising edge |
| SO | Serial Data Output | Drives read data, ID codes, and status bits; tri-state when CS high or HOLD active |
| GND | Ground Reference | Return path for VCC and all I/O; requires low-impedance PCB plane for noise immunity |
| VCC | Power Supply | 2.7–3.6 V supply; includes internal POR circuit that holds device in reset until VCC ≥ ~1.8 V |
| WP | Write Protect Input | Hardware lockout for status register writes when WPEN=1 and WP=low; prevents accidental corruption |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting sequence; requires SCK low during assertion |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode Compatibility | Supports both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) - ensures interoperability with diverse microcontrollers |
| Flexible Block Protection | Eight software-selectable protection levels (1/64 to full array) via nonvolatile BP[4:0] bits - enables secure boot partitioning |
| Self-timed Erase/Program | No external timing control needed; internal state machine manages tSE (50–200 ms), tBE (200–500 ms), tCE (1.6–4 s), and tBPC (30–50 µs) |
| JEDEC Standard Identification | RDID command (0x9F/0xAB) returns manufacturer ID 0x1F (Microchip) and device ID 0x6604 - enables automated BOM validation |
| Low Standby Current | 2.0–10.0 µA at 2.7 V - extends battery life in always-on IoT edge nodes and portable instrumentation |
Applications
| Firmware Storage | Configuration Data Logging |
|---|---|
Use Scenario: Storing bootloader, application firmware, and calibration tables in microcontroller-based industrial controllers. IC Role / Device Role / Timing Role: Nonvolatile serial code storage accessed via SPI during power-up and runtime updates. Use Value: 50 MHz read speed and 256-byte page programming enable sub-second firmware load times and efficient field upgrades. |
Use Scenario: Recording sensor calibration offsets, user preferences, and operational history in medical diagnostic equipment. IC Role / Device Role / Timing Role: Parameter retention memory with hardware write protection to prevent accidental overwrite during power transitions. Use Value: WP pin + WPEN bit allows permanent locking of critical calibration sectors while permitting dynamic update of user settings. |
| Secure Boot Partitioning | Edge AI Model Caching |
Use Scenario: Isolating immutable boot code from updatable application layers in automotive ECUs and gateways. IC Role / Device Role / Timing Role: Trusted execution environment anchor storing signed boot images and public keys. Use Value: Sector-level erase and 1/64–1/2 array protection via BP bits enforce strict separation between boot and runtime partitions. |
Use Scenario: Caching lightweight neural network weights and inference parameters in smart cameras and predictive maintenance sensors. IC Role / Device Role / Timing Role: High-reliability off-chip model storage supporting frequent partial updates without full chip erase. Use Value: 10,000-cycle endurance and 4 Kbyte sector erase allow localized weight updates aligned to model layer boundaries. |
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), 1.65–1.95 V supply, DTR support, faster tBPC (0.7 ms/page), no HOLD pin | Lower voltage operation suits battery-powered wearables; lacks HOLD for pause-resume SPI transfers | Select W25Q40EW only if system operates below 2.7 V or requires Dual Transfer Rate compatibility |
| Cypress S25FL004A | Same density, 2.7–3.6 V, 85 MHz max clock, Quad SPI support, 100K endurance, no WP/HOLD pins | Higher bandwidth and endurance suit high-write telemetry loggers; missing hardware write protect limits security use cases | Choose S25FL004A when >50 MHz throughput or >10K endurance is required, and software-only protection suffices |
Compared with AT25FS040N-SH27-T, W25Q40EW offers lower-voltage operation but omits HOLD functionality, while S25FL004A provides higher speed and endurance but removes both WP and HOLD pins - making AT25FS040N-SH27-T the only option among the three with dual hardware/software write lockout and suspend capability.
Availability
AT25FS040N-SH27-T is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT25FS040N-SH27-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 is a U.S.-based semiconductor company specializing in microcontrollers, analog components, and nonvolatile memory solutions with broad industrial and automotive qualification.
The AT25FS040N-SH27-T belongs to Microchip's AT25FS family of high-reliability SPI Flash memories designed specifically for robust firmware storage and secure configuration retention in harsh operating environments.
FAQ
What is the maximum clock frequency supported by the AT25FS040N-SH27-T?
The AT25FS040N-SH27-T supports a maximum SCK clock frequency of 50 MHz under recommended operating conditions (VCC = 2.7 V to 3.6 V, TA = –40°C to +85°C). This enables high-speed read operations in both standard READ and FAST READ modes, delivering up to 6.25 MB/s throughput when using dummy-cycle-optimized commands.
Does the AT25FS040N-SH27-T support Quad SPI or Dual SPI interfaces?
No, the AT25FS040N-SH27-T does not support Quad SPI or Dual SPI. It implements a standard 3-wire SPI interface with dedicated SI (input) and SO (output) pins, supporting only single-line data transfer in SPI Modes 0 and 3. Quad-capable alternatives like the S25FL004A require different pinouts and command sets.
How is hardware write protection implemented on the AT25FS040N-SH27-T?
Hardware write protection on the AT25FS040N-SH27-T is controlled by the WP pin in conjunction with the WPEN bit in the status register. When WPEN = 1 and WP is driven low, all writes to the status register - including BP bits and WPEN itself - are inhibited. If WPEN = 0, the WP pin has no effect, allowing full status register programmability even with WP grounded.
What is the purpose of the HOLD pin on the AT25FS040N-SH27-T?
The HOLD pin on the AT25FS040N-SH27-T suspends ongoing SPI communication without resetting the internal command sequence. When asserted low while SCK is low, it places SO in high-impedance state and ignores SI inputs, allowing the master to temporarily halt transfers - useful for interrupt servicing or bus arbitration in multi-peripheral systems.
Can the AT25FS040N-SH27-T be used in place of older AT25DF041 devices?
Yes, the AT25FS040N-SH27-T is a functional and pin-compatible upgrade to the AT25DF041, sharing identical 8-lead SOIC packaging, SPI command set (including RDID, WREN, RDSR), and 4 Mbit density. Key improvements include enhanced 50 MHz timing, tighter tBPC specification (30 µs vs. 50 µs), and extended –40°C to +85°C industrial temperature range.
AT25FS040N-SH27-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 50µs
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25FS040N-SH27-T FAQ
1.How can I place an order for AT25FS040N-SH27-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25FS040N-SH27-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 AT25FS040N-SH27-T reliable?
The price and inventory of AT25FS040N-SH27-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25FS040N-SH27-T is usually 5 days.
3.What payment methods are accepted for AT25FS040N-SH27-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25FS040N-SH27-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25FS040N-SH27-T?
AT25FS040N-SH27-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25FS040N-SH27-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 AT25FS040N-SH27-T?
For technical support, including AT25FS040N-SH27-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25FS040N-SH27-T requirements.
6.How does Aetrix verify that AT25FS040N-SH27-T is sourced from the original manufacturer or authorized distributors?
All AT25FS040N-SH27-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 AT25FS040N-SH27-T meets industry standards.
7.What is the process for return or replacement of AT25FS040N-SH27-T?
All AT25FS040N-SH27-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25FS040N-SH27-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 AT25FS040N-SH27-T part is unused and in its original packaging.
Return procedure for AT25FS040N-SH27-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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