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Microchip Technology AT25040B-SSPD-T
- Part No.:
- AT25040B-SSPD-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25040B-SSPD-T.pdf
- Description:
- IC EEPROM 4KBIT SPI 5MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,585
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Product details
Overview
AT25040B-SSPD-T from Microchip Technology is a 4 Kbit (512 × 8) SPI serial EEPROM optimized for automotive-grade data logging and configuration storage. It operates from 1.7V to 5.5V, supports SPI Modes 0 and 3, delivers up to 5 MHz clock rate at 5V, features hardware write protection via WP pin, and guarantees 1,000,000 write cycles with 100-year data retention. It is AEC-Q100 qualified for Grade 3 (–40°C to +85°C) operation in engine control units and ADAS sensor modules.
For engineers reviewing the AT25040B-SSPD-T datasheet, AT25040B-SSPD-T pinout, AT25040B-SSPD-T application, or AT25040B-SSPD-T equivalent, key selection criteria include its 8-pin SOIC package, dual-voltage support (1.7–5.5V), block-level write protection (1/4, 1/2, or full array), 8-byte page write capability, and HOLD/CS-controlled suspend functionality for deterministic bus arbitration.
Technical Context
The AT25040B-SSPD-T implements a synchronous SPI slave interface with fixed MSb-first framing, rising-edge input sampling on SI, and falling-edge output latching on SO. Its internal architecture includes a nonvolatile STATUS register controlling BP1/BP0 block protection bits, WEL write-enable latch, and RDY/BSY status flag - all accessible via dedicated opcodes (RDSR, WRSR, WREN).
It integrates a high-voltage generation circuit for EEPROM programming, power-on reset (POR) logic ensuring safe initialization, and independent HOLD and WP pins enabling concurrent bus pause and hardware write inhibition. The device supports self-timed internal write cycles completing within 5 ms maximum, with no external timing components required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 4 Kbit (512 × 8) - provides sufficient space for firmware patch storage, calibration tables, or vehicle-specific configuration parameters in ECUs. |
| VCC operating range | 1.7V to 5.5V - enables direct integration into 1.8V, 3.3V, and 5V automotive subsystems without level-shifting. |
| SPI clock frequency | Up to 5 MHz at 5V - supports fast read/write throughput for time-critical parameter updates during vehicle boot or diagnostics. |
| Write endurance | 1,000,000 cycles - ensures reliable field operation over 15+ years of daily reconfiguration in telematics or infotainment systems. |
| Data retention | 100 years at 55°C - guarantees long-term integrity of safety-critical calibration data without refresh overhead. |
| Temperature grade | AEC-Q100 Grade 3 (–40°C to +85°C) - validated for under-hood and cabin-mounted automotive electronics. |
| ESD protection | >4 kV HBM - meets IEC 61000-4-2 requirements for robustness against electrostatic discharge in assembly and service environments. |
Pinout & Package
AT25040B-SSPD-T is housed in an 8-lead SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), RoHS-compliant and halide-free. Pin numbering follows standard SOIC top-view orientation with pin 1 at bottom-left corner.
| 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 output delivering MSb-first data on falling SCK edge; enters high-impedance when CS is high or HOLD is asserted. |
| WP | Write-Protect | Hardware lock: pulling low disables all write operations (including STATUS register changes); does not interrupt ongoing internal writes. |
| GND | Ground reference | System ground connection; serves as return path for VCC and all I/O signals; must be low-impedance for noise immunity. |
| SI | Serial Data Input | MSb-first instruction/address/data input sampled on rising SCK edge; ignored during HOLD mode or when CS is high. |
| SCK | Serial Clock | Master-generated clock synchronizing all SPI transfers; supports idle-low (Mode 0) or idle-high (Mode 3) polarity configurations. |
| HOLD | Suspend Serial Input | Pauses ongoing SPI communication without resetting state; requires SCK low to assert/deassert; SO goes high-Z while active. |
| VCC | Power supply | Single-supply input (1.7–5.5V); must ramp monotonically at ≤0.1 V/µs; POR circuit enforces tPUP ≥100 µs delay before first command. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 3 certified - validated for vibration, thermal cycling, and ESD stress in production automotive applications. |
| Block write protection | Configurable via STATUS register (BP1/BP0): protects 0%, 25%, 50%, or 100% of memory array - prevents accidental overwrite of critical firmware or calibration zones. |
| Page write mode | 8-byte burst writes - reduces total programming time vs. byte-by-byte writes; enables efficient storage of multi-byte sensor offsets or CAN message buffers. |
| Dual write-protection layer | Combines hardware (WP pin) and software (WREN + WRSR) controls - allows system-level lockdown while retaining field-upgrade flexibility via secure bootloader. |
| Hold function | Non-disruptive bus arbitration - suspends SPI transfer mid-sequence without losing address or command context, supporting real-time interrupt handling in microcontroller hosts. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Storing adaptive fuel trim values, misfire counters, and diagnostic trouble codes (DTCs) across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed write integrity during voltage dips or sudden power loss. Use Value: Enables compliance with OBD-II and UNECE R155 functional safety requirements through deterministic 5 ms max write cycle and 1M endurance. |
Use Scenario: Retaining camera calibration matrices, radar object tracking history, and lane departure warning thresholds between vehicle power cycles. IC Role / Device Role / Timing Role: High-reliability parameter vault interfaced directly to SoC SPI master with HOLD support for low-latency interrupt response. Use Value: 100-year data retention at 55°C ensures calibration persistence over full vehicle lifetime without periodic refresh or backup power. |
| Body Control Module (BCM) | Infotainment Head Unit |
|
Use Scenario: Saving user preferences (seat position, mirror angle, lighting profiles) and door lock programming states. IC Role / Device Role / Timing Role: Low-power serial EEPROM accessed during wake-up sequences; standby current as low as 0.1 µA at 1.7V. Use Value: 1.7V minimum VCC enables direct connection to always-on 1.8V rail, eliminating need for additional LDO in battery-backed domains. |
Use Scenario: Storing audio equalizer presets, Bluetooth pairing IDs, and display brightness settings across firmware updates. IC Role / Device Role / Timing Role: SPI-configurable memory with hardware WP pin preventing corruption during OTA update failures. Use Value: Block write protection (BP1/BP0) isolates user data partition from firmware update partition, enforcing data isolation per ISO/SAE 21434. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95040-DRMN6TP/K | 4 Kbit SPI EEPROM, 1.8–5.5V, 20 MHz max clock, SO8 package; lacks HOLD pin and AEC-Q100 qualification. | Targeted at industrial/commercial systems without automotive temperature or reliability requirements. | Select when higher speed (20 MHz) is needed and automotive qualification is unnecessary. |
| BR24G04FJ-3GE2 | 4 Kbit I²C EEPROM, 1.6–5.5V, 1 MHz max clock, TSSOP8; uses I²C interface instead of SPI, no WP/HOLD pins. | Suitable for space-constrained designs where I²C bus is already present and lower pin count is prioritized. | Choose only if host MCU lacks SPI peripheral or board layout favors I²C routing over SPI. |
Compared with M95040-DRMN6TP/K and BR24G04FJ-3GE2, the AT25040B-SSPD-T uniquely combines AEC-Q100 Grade 3 qualification, SPI HOLD functionality for real-time arbitration, and hardware write protection - making it the sole option for safety-critical automotive SPI EEPROM use cases requiring deterministic bus control and extended temperature operation.
Availability
AT25040B-SSPD-T is available at Aetrix Electronics and suitable for engine control units, ADAS sensor modules, and body control modules requiring stable component supply across automotive production lifecycles.
Supply support for AT25040B-SSPD-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 devices, and memory solutions, serving automotive, industrial, and consumer markets with vertically integrated silicon and development tools.
The AT250xxB family was designed specifically for automotive serial EEPROM applications demanding AEC-Q100 qualification, extended temperature operation, and robust SPI interface features including HOLD and hardware write protection.
FAQ
What is the maximum clock frequency supported by AT25040B-SSPD-T?
The AT25040B-SSPD-T supports up to 5 MHz SPI clock frequency when operated at VCC = 5.0V. At lower supply voltages (e.g., 1.7V–2.5V), the maximum reliable clock rate decreases per AC characteristics in DS20006285B; design margin should be applied for Grade 3 temperature operation.
Does AT25040B-SSPD-T support SPI Mode 1 or Mode 2?
No. The AT25040B-SSPD-T explicitly supports only SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1), as confirmed in the official datasheet. Modes 1 and 2 are not compatible due to fixed input sampling on rising SCK edge and output latching on falling SCK edge.
How is write protection implemented on AT25040B-SSPD-T?
AT25040B-SSPD-T implements dual-layer write protection: hardware via the WP pin (low = all writes inhibited), and software via BP1/BP0 bits in the STATUS register (configuring 0%, 25%, 50%, or 100% array protection). Both layers must be disabled for full write access.
What is the purpose of the HOLD pin on AT25040B-SSPD-T?
The HOLD pin on AT25040B-SSPD-T suspends ongoing SPI communication without resetting internal state - allowing the host MCU to service higher-priority interrupts and resume the exact same transaction. It asserts high-impedance on SO and ignores SI/SCK until deasserted during SCK low time.
Is AT25040B-SSPD-T pin-compatible with AT25020B-SSPD-T or AT25010B-SSPD-T?
Yes. All three variants (AT25010B/AT25020B/AT25040B) share identical 8-pin SOIC/TSSOP/UDFN packages, pinout, SPI interface timing, and command set. Only memory density differs (1K/2K/4K), so AT25040B-SSPD-T can replace smaller variants without PCB changes - provided firmware addresses the full 512-word space.
AT25040B-SSPD-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:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 4Kbit
- Memory Organization:
- 512 x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 5 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25040B-SSPD-T FAQ
1.How can I place an order for AT25040B-SSPD-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25040B-SSPD-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 AT25040B-SSPD-T reliable?
The price and inventory of AT25040B-SSPD-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25040B-SSPD-T is usually 5 days.
3.What payment methods are accepted for AT25040B-SSPD-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25040B-SSPD-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25040B-SSPD-T?
AT25040B-SSPD-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25040B-SSPD-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 AT25040B-SSPD-T?
For technical support, including AT25040B-SSPD-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25040B-SSPD-T requirements.
6.How does Aetrix verify that AT25040B-SSPD-T is sourced from the original manufacturer or authorized distributors?
All AT25040B-SSPD-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 AT25040B-SSPD-T meets industry standards.
7.What is the process for return or replacement of AT25040B-SSPD-T?
All AT25040B-SSPD-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25040B-SSPD-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 AT25040B-SSPD-T part is unused and in its original packaging.
Return procedure for AT25040B-SSPD-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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