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Microchip Technology AT25256B-MAPDGV-E
- Part No.:
- AT25256B-MAPDGV-E
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT25256B-MAPDGV-E.pdf
- Description:
- IC EEPROM 256KBIT SPI 5MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,363
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Product details
Overview
AT25256B-MAPDGV-E from Microchip Technology is a 256 Kbit (32,768 × 8) SPI serial EEPROM optimized for automotive systems, supporting AEC-Q100 Grade 1 operation from −40°C to +125°C, 2.5V–5.5V supply, and 5 MHz clock rate at 5V. It features hardware/software write protection, 64-byte page writes, and 1,000,000 write endurance for infotainment configuration storage and ECU parameter logging.
For engineers reviewing the AT25256B-MAPDGV-E datasheet, AT25256B-MAPDGV-E pinout, AT25256B-MAPDGV-E application, or AT25256B-MAPDGV-E equivalent, this page delivers verified package mapping (8-lead SOIC), full pin function validation, real-world automotive use cases, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The AT25256B-MAPDGV-E implements a synchronous SPI slave interface compliant with Modes 0 and 3, latching input on SCK rising edge and driving output on falling edge. Its internal architecture includes a nonvolatile STATUS register with WPEN, BP1/BP0, WEL, and RDY/BSY bits, enabling configurable block write protection (1/4, 1/2, or full array) and hardware-driven data integrity control via dedicated WP and HOLD pins.
It integrates high-voltage generation circuitry for EEPROM cell programming, power-on reset (POR) logic ensuring safe initialization, and automatic self-timed write cycles completing in ≤5 ms. All operations are validated across automotive temperature and voltage ranges, with ESD robustness >4 kV per HBM and green RoHS-compliant packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbits (32,768 × 8), directly supports firmware revision tracking and calibration table storage without external address decoding |
| Interface Protocol | SPI Mode 0 & 3 compatible; ensures interoperability with common microcontroller SPI peripherals including ARM Cortex-M and Renesas RH850 |
| Operating Voltage | 2.5V to 5.5V (Grade 1); enables direct connection to 3.3V or 5V automotive MCU I/O rails without level-shifting |
| Temperature Range | −40°C to +125°C (AEC-Q100 Grade 1); qualified for under-hood and transmission control module deployment |
| Write Endurance | 1,000,000 cycles; supports daily reconfiguration of vehicle settings over 10+ years of service life |
| Data Retention | 100 years at 55°C; guarantees long-term validity of safety-critical calibration data across product lifecycle |
| Page Write Size | 64 bytes; minimizes write latency during burst updates (e.g., sensor offset compensation tables) |
| Max Clock Frequency | 5 MHz at VCC = 5V; enables sub-100 µs read access for time-sensitive diagnostic routines |
Pinout & Package
AT25256B-MAPDGV-E is housed in an 8-lead SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), pin-compatible with industry-standard SPI EEPROM footprints and suitable for automated SMT assembly in automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be driven low before any instruction; 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 SCK falling edge; enters high-impedance when CS is high or HOLD is asserted |
| WP | Write-Protect | Hardware lock for STATUS register writes when WPEN = 1; allows system-level protection against accidental firmware corruption |
| GND | Ground Reference | Primary return path for VCC and all I/O; must be connected to system ground plane with low-inductance routing |
| SI | Serial Data Input | MSb-first instruction/address/data input sampled on SCK rising edge; ignored during HOLD assertion |
| SCK | Serial Clock Input | Master-generated clock synchronizing all SPI transfers; idle state must match selected mode (low for Mode 0, high for Mode 3) |
| HOLD | Suspend Control | Pauses ongoing SPI transfer without resetting sequence; used to temporarily yield bus to higher-priority masters in multi-slave systems |
| VCC | Power Supply | 2.5V–5.5V supply input; requires local 100 nF ceramic decoupling capacitor placed within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for continuous operation at −40°C to +125°C, meeting automotive reliability requirements for engine control and ADAS modules |
| Block write protection (BP1/BP0) | Configurable via STATUS register to protect 0%, 25%, 50%, or 100% of memory-enables secure partitioning of user vs. factory data zones |
| Hardware + software write protection | Combines WP pin control with WREN/WRDI opcodes and STATUS register locking, preventing unauthorized writes even during firmware update sequences |
| Self-timed write cycle ≤5 ms | Eliminates need for external timing control or polling overhead; simplifies host driver implementation and reduces CPU load |
| 64-byte page write capability | Reduces total write time by up to 63× versus byte-write for contiguous data blocks (e.g., CAN message logs or OTA patch metadata) |
| Hold function with no sequence reset | Enables deterministic bus arbitration in multi-master SPI systems-critical for coexistence with display controllers or sensor hubs sharing same bus |
Applications
| Automotive Instrument Cluster | ADAS Camera Module |
|---|---|
|
Use Scenario: Storing and updating odometer values, trip counters, and driver preference settings across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed data retention over 100 years and immunity to battery disconnect events. Use Value: Eliminates need for backup capacitors or supercapacitors while maintaining AEC-Q100 compliance and supporting frequent write cycles during vehicle operation. |
Use Scenario: Logging lens calibration coefficients and image sensor gain tables during factory calibration and field updates. IC Role / Device Role / Timing Role: High-reliability parameter storage interfaced directly to camera SoC's SPI master port. Use Value: Enables 1M-cycle endurance for repeated recalibration without degradation, and 64-byte page writes reduce calibration time by >90% versus byte-wise updates. |
| Engine Control Unit (ECU) | Electric Power Steering (EPS) |
|
Use Scenario: Holding fuel injection timing maps, knock sensor thresholds, and emissions-related trim parameters subject to regulatory updates. IC Role / Device Role / Timing Role: Secure, write-protected memory zone for safety-critical calibration data accessible only after WREN and proper BP bit configuration. Use Value: Hardware WP pin + BP1/BP0 bits prevent inadvertent overwrite during diagnostics or reflashing, satisfying ISO 26262 ASIL-B data integrity requirements. |
Use Scenario: Storing torque sensor zero-point offsets and motor phase alignment data that must survive vehicle shutdown and thermal cycling. IC Role / Device Role / Timing Role: Temperature-stable EEPROM operating continuously at 125°C ambient inside EPS housing. Use Value: Grade 1 qualification ensures reliable read/write performance across full automotive thermal range without derating or thermal throttling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95256-DRMN6TP/K | 256 Kbit SPI EEPROM, 1.8V–5.5V supply, −40°C to +125°C, but rated for industrial (not AEC-Q100) grade; lacks HOLD pin | Not qualified for automotive safety-critical modules; suitable for non-safety infotainment accessories where HOLD is unused | Select when AEC-Q100 is not required and board space allows TSSOP-8; verify absence of HOLD does not impact system bus arbitration |
| BR25H256FJ-WE2 | 256 Kbit SPI EEPROM, 1.7V–5.5V, AEC-Q100 Grade 2 (−40°C to +105°C), integrated write protection, but no WP or HOLD pins | Limited to cabin electronics (e.g., HVAC controls); cannot support hold-based multi-master arbitration or hardware WP lockout | Choose for cost-sensitive cabin modules where full Grade 1 temp range and dual protection pins are unnecessary |
Compared with M95256-DRMN6TP/K and BR25H256FJ-WE2, AT25256B-MAPDGV-E uniquely delivers AEC-Q100 Grade 1 qualification plus both WP and HOLD pins-enabling simultaneous hardware write lockout and deterministic bus suspension in safety-critical powertrain and chassis systems.
Availability
AT25256B-MAPDGV-E is available at Aetrix Electronics and suitable for automotive instrument clusters, ADAS camera modules, engine control units, and electric power steering systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for AT25256B-MAPDGV-E 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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with deep expertise in automotive-grade IC design and qualification.
The AT25256B-MAPDGV-E belongs to Microchip's automotive-qualified serial EEPROM product line, engineered specifically for reliable nonvolatile data storage in harsh-temperature, safety-critical vehicle subsystems.
FAQ
What is the AEC-Q100 qualification grade for AT25256B-MAPDGV-E?
AT25256B-MAPDGV-E is AEC-Q100 qualified to Grade 1, meaning it is fully tested and guaranteed to operate reliably from −40°C to +125°C. This qualification covers device-level stress testing including temperature cycling, HTOL, and ESD, making AT25256B-MAPDGV-E suitable for under-hood applications such as engine control and transmission modules where thermal extremes are routine.
Does AT25256B-MAPDGV-E support both SPI Mode 0 and Mode 3?
Yes, AT25256B-MAPDGV-E supports both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1). In both modes, data is latched on the SCK rising edge and output on the falling edge. The key distinction is SCK idle state: low for Mode 0, high for Mode 3. AT25256B-MAPDGV-E requires matching SCK polarity before and after CS assertion to maintain synchronization.
How does the HOLD pin function during an active write cycle in AT25256B-MAPDGV-E?
The HOLD pin in AT25256B-MAPDGV-E has no effect on an ongoing internal write cycle-it only suspends serial communication (SI/SO/SCK interaction) while CS remains active. If a WRITE command has already initiated the self-timed 5 ms programming sequence, asserting HOLD will pause data transfer but not interrupt the EEPROM cell write. AT25256B-MAPDGV-E continues programming and asserts RDY/BSY = 1 until completion.
What memory protection options are available on AT25256B-MAPDGV-E?
AT25256B-MAPDGV-E provides three layers of memory protection: (1) hardware WP pin control (when WPEN = 1), (2) software-configurable block protection via BP1/BP0 bits (1/4, 1/2, or full array), and (3) STATUS register write lock via WREN/WRDI opcodes. These can be combined-for example, using WP to lock STATUS register writes while BP bits protect critical calibration sectors-ensuring robust defense against unintended overwrites in AT25256B-MAPDGV-E deployments.
Is AT25256B-MAPDGV-E pin-compatible with other 8-lead SOIC SPI EEPROMs?
AT25256B-MAPDGV-E uses standard 8-lead SOIC pinout (CS/SO/WP/GND/SI/SCK/HOLD/VCC), matching JEDEC MS-012AC. It is functionally pin-compatible with other SPI EEPROMs using this layout-such as the AT25128B series-but differences in HOLD/WP functionality, timing specs, and AEC-Q100 qualification mean direct substitution requires validation of timing margins, protection behavior, and automotive compliance. Always verify HOLD and WP pin usage in target system firmware before replacement.
AT25256B-MAPDGV-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K 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-UDFN (2x3)
AT25256B-MAPDGV-E FAQ
1.How can I place an order for AT25256B-MAPDGV-E through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25256B-MAPDGV-E 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 AT25256B-MAPDGV-E reliable?
The price and inventory of AT25256B-MAPDGV-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25256B-MAPDGV-E is usually 5 days.
3.What payment methods are accepted for AT25256B-MAPDGV-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25256B-MAPDGV-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25256B-MAPDGV-E?
AT25256B-MAPDGV-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25256B-MAPDGV-E 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 AT25256B-MAPDGV-E?
For technical support, including AT25256B-MAPDGV-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25256B-MAPDGV-E requirements.
6.How does Aetrix verify that AT25256B-MAPDGV-E is sourced from the original manufacturer or authorized distributors?
All AT25256B-MAPDGV-E 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 AT25256B-MAPDGV-E meets industry standards.
7.What is the process for return or replacement of AT25256B-MAPDGV-E?
All AT25256B-MAPDGV-E units undergo pre-shipment inspection (PSI). If there is an issue with AT25256B-MAPDGV-E, 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 AT25256B-MAPDGV-E part is unused and in its original packaging.
Return procedure for AT25256B-MAPDGV-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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