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Microchip Technology AT25256B-MAPDGV-T
- Part No.:
- AT25256B-MAPDGV-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT25256B-MAPDGV-T.pdf
- Description:
- IC EEPROM 256KBIT SPI 5MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,187
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Product details
Overview
AT25256B-MAPDGV-T 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 write protection via WP pin, HOLD suspend functionality, and 64-byte page write capability.
For engineers reviewing the AT25256B-MAPDGV-T datasheet, AT25256B-MAPDGV-T pinout, AT25256B-MAPDGV-T application, or AT25256B-MAPDGV-T equivalent, key selection criteria include automotive temperature qualification, SPI Mode 0/3 compatibility, block-level write protection granularity (1/4, 1/2, or full array), and self-timed 5 ms max write cycle performance.
Technical Context
The AT25256B-MAPDGV-T implements a synchronous SPI slave interface with fixed MSb-first data framing, rising-edge input sampling on SI, and falling-edge output valid on SO. Its internal architecture includes a nonvolatile STATUS register controlling WPEN, BP1/BP0, and WEL bits, enabling flexible software/hardware write protection schemes.
It supports dual-voltage operation (Grade 1: 2.5–5.5V; Grade 3: 1.7–5.5V), integrates Power-on Reset (POR) with 100 µs tPUP delay, and uses high-voltage generation circuitry for EEPROM cell programming. The HOLD pin suspends ongoing SPI transfers without resetting internal state, while WP pin behavior is gated by the nonvolatile WPEN bit in STATUS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbits (32,768 × 8), organized as byte-addressable linear array for direct firmware parameter storage |
| Interface | SPI slave, compatible with Modes 0 (CPOL=0, CPHA=0) and 3 (CPOL=1, CPHA=1); no master-side configuration overhead |
| Operating Voltage | 2.5V–5.5V (Grade 1), enabling direct integration into 3.3V and 5V automotive microcontroller buses |
| Temperature Range | −40°C to +125°C (AEC-Q100 Grade 1), qualified for engine control unit (ECU) and transmission control module (TCM) environments |
| Write Cycle Time | ≤5 ms maximum self-timed internal write, eliminating need for external polling delay in time-critical boot sequences |
| Endurance & Retention | 1,000,000 write cycles and 100-year data retention at 55°C, supporting long-life vehicle ECU calibration storage |
| ESD Protection | >4 kV HBM, meeting automotive board-level robustness requirements for in-vehicle deployment |
Pinout & Package
AT25256B-MAPDGV-T is supplied in an 8-lead SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), RoHS-compliant and halide-free per Microchip's green packaging standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must transition high→low before SCK to initiate command sequence; requires pull-up resistor for robust power-up behavior |
| SO | Serial Data Output | Tri-state open-drain output; data valid on falling edge of SCK; high-impedance when CS high or HOLD active |
| WP | Write-Protect | Hardware lock for STATUS register writes when WPEN=1; function disabled if WPEN=0, allowing ground-tied WP in space-constrained layouts |
| GND | Ground Reference | Primary return path for VCC and all I/O; must be low-impedance connection to minimize noise coupling into EEPROM read/write paths |
| SI | Serial Data Input | Command/address/data input; latched on rising edge of SCK; MSb-first framing required for opcode and address decoding |
| SCK | Serial Clock Input | Asynchronous master-generated clock; defines timing for SI sampling and SO output; idle polarity depends on selected SPI mode (0 or 3) |
| HOLD | Suspend Control | Pauses SPI transfer mid-sequence without resetting state; requires SCK low during assertion/deassertion; does not interrupt active write cycles |
| VCC | Power Supply | Single 2.5–5.5V rail; POR circuit ensures no spurious writes during ramp-up; slew rate ≤0.1 V/µs recommended |
Key Features
| Feature | Design Value |
|---|---|
| Automotive AEC-Q100 Grade 1 Qualification | Validated for −40°C to +125°C operation with full electrical characterization, enabling use in safety-critical ECU modules |
| Flexible Block Write Protection | Software-configurable 1/4, 1/2, or full memory array lock via BP1/BP0 bits-prevents accidental overwrites of calibration or VIN data |
| Hardware + Software Write Protection | Combines dedicated WP pin (hardware) and STATUS register control (software) for layered data integrity in field-programmable systems |
| 64-Byte Page Write Mode | Enables burst programming of up to 64 bytes per write cycle, reducing total programming time by >90% vs. byte-by-byte writes |
| HOLD Pin for SPI Bus Arbitration | Allows host MCU to pause EEPROM communication during higher-priority interrupts-preserves command context without reinitialization |
| Green Packaging (RoHS/Halide-Free) | Meets global automotive environmental compliance mandates including ELV and IMDS reporting requirements |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Storing adaptive fuel trim tables, knock sensor learning values, and emission calibration parameters that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with guaranteed write completion under transient voltage conditions during engine cranking. Use Value: 5 ms max write cycle and POR reset behavior ensure reliable parameter updates even during 8–12 V battery dips common in start-stop systems. |
Use Scenario: Retaining camera lens calibration offsets, radar object detection thresholds, and sensor fusion coefficients after power-down. IC Role / Device Role / Timing Role: High-reliability data vault for safety-critical ADAS metadata, accessed via SPI from SoC during boot initialization. Use Value: 1,000,000 write cycles and 100-year retention support lifetime recalibration events without wear-out concerns in L2+/L3 systems. |
| Transmission Control Module (TCM) | Body Control Module (BCM) |
|
Use Scenario: Logging gear shift history, clutch wear metrics, and torque converter lock-up profiles for predictive maintenance diagnostics. IC Role / Device Role / Timing Role: Field-updatable event logger with hardware WP pin preventing corruption during CAN bus firmware updates. Use Value: WP pin + WPEN bit combination allows permanent lock of critical logs while permitting dynamic update of service counters. |
Use Scenario: Holding door lock configuration, lighting scene presets, and seat position memory across vehicle power cycles. IC Role / Device Role / Timing Role: Low-power SPI EEPROM interfaced directly to 3.3V microcontroller GPIOs, drawing only 0.2 µA standby current at 2.5V. Use Value: Ultra-low ISB2 standby current extends battery life in always-on BCM applications with infrequent parameter access. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT25256B-MAHD-T | Same die, 8-lead TSSOP package (3.0 × 4.4 mm); 0.65 mm pitch; thinner profile than SOIC | Better suited for space-constrained PCBs where height or footprint area is limited (e.g., compact ADAS camera modules) | Select when board layout requires smaller footprint or lower profile; identical electrical and functional behavior |
| M95256-DFMN6TP | STMicroelectronics 256 Kbit SPI EEPROM; AEC-Q100 Grade 1; 1.7–5.5V; 20 MHz max clock; different STATUS register map | Higher speed interface but incompatible STATUS bit definitions-requires firmware adaptation for write protection logic | Choose only if system already uses ST's M95xxx family and firmware can accommodate differing BP/WPEN bit positions |
Compared with AT25256B-MAPDGV-T, the AT25256B-MAHD-T offers identical functionality in a smaller TSSOP package for density-sensitive designs, while the M95256-DFMN6TP provides faster clocking but demands register-level firmware changes due to non-matching status control semantics.
Availability
AT25256B-MAPDGV-T is available at Aetrix Electronics and suitable for automotive engine control units, advanced driver assistance systems, and transmission control modules requiring stable component supply across extended product lifecycles.
Supply support for AT25256B-MAPDGV-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 manufacturer specializing in microcontrollers, analog devices, and memory solutions, with broad automotive qualification expertise and ISO/TS 16949-certified operations.
The AT25256B-MAPDGV-T belongs to Microchip's automotive-grade serial EEPROM product line, designed specifically for mission-critical data storage in harsh-temperature vehicle subsystems where reliability and AEC-Q100 compliance are mandatory.
FAQ
What automotive qualification level does the AT25256B-MAPDGV-T meet?
The AT25256B-MAPDGV-T is AEC-Q100 qualified to Grade 1, meaning it is fully characterized and tested for operation from −40°C to +125°C ambient temperature. This qualification covers stress testing, failure analysis, and parametric validation per the AEC-Q100 standard, making AT25256B-MAPDGV-T suitable for under-hood applications such as engine control units and transmission control modules.
Does the AT25256B-MAPDGV-T support both SPI Mode 0 and Mode 3?
Yes, the AT25256B-MAPDGV-T supports both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1). In both modes, data is sampled on the rising edge of SCK and output on the falling edge. The difference lies only in SCK idle polarity-low for Mode 0, high for Mode 3-and AT25256B-MAPDGV-T automatically adapts based on the master's configuration without requiring device-side mode selection.
How does the Write-Protect (WP) pin interact with the STATUS register in the AT25256B-MAPDGV-T?
In the AT25256B-MAPDGV-T, the WP pin only inhibits writes to the STATUS register when the WPEN bit (bit 7) is set to 1. If WPEN = 0, the WP pin is ignored, allowing full STATUS register access even when WP is tied to GND. This design enables flexible system integration-AT25256B-MAPDGV-T can be installed in boards with permanently grounded WP pins while retaining software configurability of block protection bits BP1/BP0.
What is the maximum write speed and page size supported by the AT25256B-MAPDGV-T?
The AT25256B-MAPDGV-T supports a maximum SPI clock frequency of 5 MHz at 5V, enabling high-throughput communication. It implements a 64-byte page write mode, allowing up to 64 sequential bytes to be programmed in a single self-timed write cycle with ≤5 ms duration. This significantly accelerates bulk parameter updates compared to byte-write operations, which require individual 5 ms cycles per byte.
Can the AT25256B-MAPDGV-T retain data for the full vehicle lifecycle?
Yes-the AT25256B-MAPDGV-T guarantees 100 years of data retention at 55°C and 1,000,000 write/erase cycles at 25°C, as validated through accelerated life testing and qualification per AEC-Q100. These specifications exceed typical automotive platform lifespans (15+ years), ensuring calibration data, VIN information, and diagnostic logs remain intact throughout the vehicle's operational life without degradation.
AT25256B-MAPDGV-T 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-T FAQ
1.How can I place an order for AT25256B-MAPDGV-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25256B-MAPDGV-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 AT25256B-MAPDGV-T reliable?
The price and inventory of AT25256B-MAPDGV-T 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-T is usually 5 days.
3.What payment methods are accepted for AT25256B-MAPDGV-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25256B-MAPDGV-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25256B-MAPDGV-T?
AT25256B-MAPDGV-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25256B-MAPDGV-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 AT25256B-MAPDGV-T?
For technical support, including AT25256B-MAPDGV-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25256B-MAPDGV-T requirements.
6.How does Aetrix verify that AT25256B-MAPDGV-T is sourced from the original manufacturer or authorized distributors?
All AT25256B-MAPDGV-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 AT25256B-MAPDGV-T meets industry standards.
7.What is the process for return or replacement of AT25256B-MAPDGV-T?
All AT25256B-MAPDGV-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25256B-MAPDGV-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 AT25256B-MAPDGV-T part is unused and in its original packaging.
Return procedure for AT25256B-MAPDGV-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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