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Microchip Technology AT25040B-SSHL-B
- Part No.:
- AT25040B-SSHL-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25040B-SSHL-B.pdf
- Description:
- IC EEPROM 4KBIT SPI 20MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,053
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Product details
Overview
AT25040B-SSHL-B from Microchip Technology is a 4-Kbit SPI Serial EEPROM (512 × 8-bit array) optimized for low-voltage embedded systems, supporting 1.8V–5.5V operation, industrial temperature range (−40°C to +85°C), and up to 20 MHz clock rate at 5V. It features hardware write protection via WP pin, HOLD suspend functionality, and 8-byte page write mode - deployed in space-constrained IoT sensor nodes, industrial PLCs, and medical device calibration storage.
For engineers reviewing the AT25040B-SSHL-B datasheet, AT25040B-SSHL-B pinout, AT25040B-SSHL-B application, or AT25040B-SSHL-B equivalent, key selection criteria include SPI Mode 0/3 compatibility, 5 ms max self-timed write cycle, 1M endurance, 100-year data retention, and SOIC-8 package with verified pin mapping for CS/SO/WP/GND/SI/SCK/HOLD/VCC.
Technical Context
The AT25040B-SSHL-B implements a synchronous SPI slave interface with fixed MSB-first framing, rising-edge input sampling (SI), and falling-edge output timing (SO). Its internal architecture includes a STATUS register with nonvolatile BP1/BP0 bits enabling quarter/half/entire array block write protection, plus WEL and RDY/BSY flags managed via RDSR/WRSR opcodes.
It supports dual-layer data protection: hardware-level inhibition via WP pin (low = all writes blocked) and software-level control via STATUS register configuration. The HOLD pin suspends serial communication without resetting the instruction sequence, provided SCK is low during assertion/deassertion - preserving state across temporary master bus arbitration delays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4 Kbit (512 words × 8 bits); enables storage of firmware patches, calibration coefficients, or device identity in compact MCU-based systems |
| Supply Voltage Range | 1.8 V to 5.5 V; supports direct interfacing with 1.8V logic, 3.3V microcontrollers, and legacy 5V industrial controllers without level-shifting |
| Max Clock Frequency | 20 MHz at VCC ≥ 4.5 V; delivers 2.5 MB/s effective read throughput for rapid configuration loading |
| Write Cycle Time | ≤ 5 ms (self-timed); eliminates need for external polling delay timers in host firmware |
| Endurance & Retention | 1,000,000 write cycles / 100 years data retention at 55°C; suitable for field-updatable systems requiring long-term reliability |
| Operating Temperature | −40°C to +85°C (industrial grade); validated for deployment in factory automation, outdoor metering, and automotive under-hood modules |
| ESD Protection | > 4,000 V HBM; reduces risk of damage during board handling and system integration |
Pinout & Package
AT25040B-SSHL-B is supplied in an 8-lead SOIC package (3.9 mm × 4.9 mm body, 1.27 mm pitch), RoHS-compliant and green (halide-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be driven low before any SPI transaction; requires pull-up resistor (≤10 kΩ) tied to VCC for robust power-up behavior |
| SO | Serial Data Output | Tri-state open-drain output; drives data on falling edge of SCK; high-impedance when CS high or HOLD active |
| WP | Write-Protect | Hardware lock: low = all write operations inhibited (including STATUS register changes); does not affect ongoing internal write cycles |
| GND | Ground Reference | System ground return path for VCC supply and all I/O signals; must be low-impedance connection to minimize noise coupling |
| SI | Serial Data Input | Input for opcodes, addresses, and write data; sampled on rising edge of SCK; ignored during HOLD or CS high |
| SCK | Serial Clock Input | Master-generated clock; defines timing for SI sampling and SO output; idle polarity depends on SPI mode (0 = low, 3 = high) |
| HOLD | Suspend Control | Pauses serial communication mid-transaction when asserted low during SCK low; resumes on deassertion during next SCK low pulse |
| VCC | Power Supply | Primary power rail; must ramp monotonically at ≤0.1 V/µs; POR circuit ensures stable initialization before accepting commands |
Key Features
| Feature | Design Value |
|---|---|
| 8-byte page write mode | Reduces average write time per byte by batching; enables efficient updates of small parameter sets without full-sector erase overhead |
| Block write protection (BP1/BP0) | Configurable via STATUS register to protect 25%, 50%, or 100% of memory - prevents accidental overwrite of critical boot or calibration data |
| Hardware/software dual protection | WP pin provides immediate physical lockout; WREN/WRDI instructions allow dynamic enable/disable of write capability under firmware control |
| HOLD pin suspend function | Maintains internal state during bus arbitration; avoids command retransmission or timeout handling in multi-master SPI environments |
| Green RoHS-compliant packaging | Meets global environmental regulations (lead-free, halide-free); qualified for use in medical, industrial, and consumer electronics with strict compliance requirements |
Applications
| Industrial Sensor Calibration Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients and linearization tables for analog sensor front-ends in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile parameter repository accessed during power-up initialization and runtime recalibration routines. Use Value: Enables traceable, field-upgradable calibration without requiring MCU flash reprogramming or external programming fixtures. | Use Scenario: Holding patient-specific therapy parameters, device serial number, and usage logs in portable infusion pumps and diagnostic monitors. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration store with hardware write-lock (WP pin) activated during normal operation. Use Value: Meets IEC 62304 safety requirements for persistent data integrity and prevents unauthorized parameter modification during clinical use. |
| Automotive Body Control Module (BCM) | Smart Energy Meter Firmware Patch Storage |
Use Scenario: Retaining user preferences (mirror position, seat settings) and fault history logs in 12V automotive BCMs operating across extended temperature ranges. IC Role / Device Role / Timing Role: Low-power EEPROM interfaced directly to 3.3V CAN microcontroller; accessed during wake-up and sleep transitions. Use Value: Operates reliably at −40°C to +85°C with 1.8V–5.5V supply tolerance, eliminating need for voltage regulators or backup batteries. | Use Scenario: Storing signed firmware patch images and version metadata in utility-grade smart meters deployed in unattended outdoor enclosures. IC Role / Device Role / Timing Role: Secure update payload storage with 1M write endurance and 100-year data retention at elevated ambient temperatures. Use Value: Supports over-the-air (OTA) updates without field replacement; BP1/BP0 bits prevent corruption of active firmware partition during patch application. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95040-DRMN3TP/K | 4-Kbit SPI EEPROM (512 × 8), 2.5–5.5 V supply, 10 MHz max clock at 2.5 V, SOIC-8 package | Lacks HOLD pin; no suspend functionality; lower max speed at 1.8V operation | Select when HOLD is unused and cost sensitivity outweighs feature parity |
| CAT25040VI-GT3 | 4-Kbit SPI EEPROM, 1.8–5.5 V, 20 MHz max clock, SOIC-8, built-in write-cycle endurance counter | Includes programmable endurance monitor register; different STATUS bit layout (no BP1/BP0) | Prefer when lifecycle tracking of write wear is required for predictive maintenance |
Compared with M95040-DRMN3TP/K and CAT25040VI-GT3, AT25040B-SSHL-B uniquely combines HOLD suspend, configurable block protection (BP1/BP0), and guaranteed 20 MHz operation down to 4.5 V - making it optimal for real-time systems requiring deterministic SPI bus arbitration and robust data partitioning.
Availability
AT25040B-SSHL-B is available at Aetrix Electronics and suitable for industrial sensor calibration storage, medical device configuration memory, and automotive body control modules requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.
Supply support for AT25040B-SSHL-B 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 devices, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The AT250xxB family is designed for reliable, low-power nonvolatile data storage in resource-constrained embedded systems - emphasizing SPI simplicity, industrial temperature resilience, and dual hardware/software write protection.
FAQ
What is the maximum SPI clock frequency supported by AT25040B-SSHL-B?
The AT25040B-SSHL-B supports up to 20 MHz SCK frequency when VCC is 4.5 V to 5.5 V, 10 MHz at 2.5 V to 5.5 V, and 5 MHz across the full 1.8 V to 5.5 V range. These limits are defined in Table 4-3 of the DS20006251A datasheet and reflect AC timing constraints for reliable setup/hold and output validity. AT25040B-SSHL-B must operate within these bounds to ensure correct opcode decoding and data transfer integrity.
Does AT25040B-SSHL-B support SPI Mode 1 or Mode 2?
No, AT25040B-SSHL-B explicitly supports only SPI Modes 0 and 3, as confirmed in Section 5 of the DS20006251A datasheet. It samples SI on the rising edge and outputs SO on the falling edge of SCK in both modes; the difference lies solely in SCK idle polarity (low for Mode 0, high for Mode 3). Attempting Mode 1 or 2 will result in incorrect data latching or communication failure. AT25040B-SSHL-B requires matching SCK idle state before and after CS assertion.
How does the HOLD pin function during an active write cycle in AT25040B-SSHL-B?
The HOLD pin has no effect on an ongoing internal write cycle in AT25040B-SSHL-B. As stated in Section 5.3, Hold mode suspends serial communication but does not pause the self-timed 5 ms write operation. If HOLD is asserted while a WRITE command is executing, SO enters high-impedance and SI/SCK are ignored, yet the EEPROM cell programming continues to completion. AT25040B-SSHL-B resumes normal SPI operation only after the write finishes and HOLD is deasserted during SCK low.
What is the default state of the STATUS register after power-up for AT25040B-SSHL-B?
At power-up, AT25040B-SSHL-B initializes with WEL = 0 (write disabled), RDY/BSY = 0 (ready), and BP1/BP0 unchanged from their last written value (nonvolatile). The EEPROM array contains all 0xFF data. This behavior is documented in Section 4.6.5 and ensures safe default operation: no writes can occur until WREN is issued, and the device signals readiness immediately. AT25040B-SSHL-B remains in standby until CS is asserted low.
Can AT25040B-SSHL-B be used with a 1.8V microcontroller without level shifting?
Yes, AT25040B-SSHL-B operates natively from 1.8 V to 5.5 V and specifies VIH(min) = 0.7 × VCC and VIL(max) = 0.3 × VCC across this range. At 1.8 V, VIH(min) = 1.26 V and VIL(max) = 0.54 V - fully compatible with standard 1.8 V CMOS logic thresholds. No level shifting is required between AT25040B-SSHL-B and 1.8 V MCUs, provided SCK rise/fall times stay within 2000 ns (Section 4.4).
AT25040B-SSHL-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 20 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25040B-SSHL-B FAQ
1.How can I place an order for AT25040B-SSHL-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25040B-SSHL-B 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 AT25040B-SSHL-B reliable?
The price and inventory of AT25040B-SSHL-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25040B-SSHL-B is usually 5 days.
3.What payment methods are accepted for AT25040B-SSHL-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25040B-SSHL-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25040B-SSHL-B?
AT25040B-SSHL-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25040B-SSHL-B 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 AT25040B-SSHL-B?
For technical support, including AT25040B-SSHL-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25040B-SSHL-B requirements.
6.How does Aetrix verify that AT25040B-SSHL-B is sourced from the original manufacturer or authorized distributors?
All AT25040B-SSHL-B 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 AT25040B-SSHL-B meets industry standards.
7.What is the process for return or replacement of AT25040B-SSHL-B?
All AT25040B-SSHL-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25040B-SSHL-B, 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 AT25040B-SSHL-B part is unused and in its original packaging.
Return procedure for AT25040B-SSHL-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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