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Microchip Technology AT25256B-SSPDGV-T
- Part No.:
- AT25256B-SSPDGV-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25256B-SSPDGV-T.pdf
- Description:
- IC EEPROM 256KBIT SPI 5MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,844
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Product details
Overview
AT25256B-SSPDGV-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-SSPDGV-T datasheet, AT25256B-SSPDGV-T pinout, AT25256B-SSPDGV-T application, or AT25256B-SSPDGV-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 guaranteed 1,000,000 write cycles with 100-year data retention.
Technical Context
The AT25256B-SSPDGV-T implements a synchronous SPI slave interface with fixed MSb-first framing, latching input on SCK rising edge and outputting on falling edge. Its internal architecture includes a nonvolatile STATUS register controlling WPEN, BP1/BP0, and WEL bits, enabling flexible hardware/software write protection schemes without external logic.
It integrates a high-voltage generation circuit for EEPROM programming, power-on reset (POR) with 100 µs tPUP delay, and automatic self-timed write cycles completing in ≤5 ms. The HOLD pin suspends ongoing SPI transfers without resetting internal state-critical for deterministic timing in real-time automotive control loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbits (32,768 × 8), directly addressable byte-wise for firmware parameter storage and calibration data logging |
| Supply voltage range | 2.5V–5.5V (Grade 1), supports direct connection to 3.3V or 5V automotive microcontroller I/O rails without level shifting |
| Max clock frequency | 5 MHz at VCC = 5V, enabling ≤26 µs per byte read/write transfer time for time-critical boot configuration loads |
| Write endurance | 1,000,000 cycles, sufficient for >10 years of daily reprogramming in engine control unit (ECU) fault log management |
| Data retention | 100 years at 55°C, ensuring calibration data integrity over full vehicle lifetime without refresh mechanisms |
| Operating temperature | −40°C to +125°C (AEC-Q100 Grade 1), qualified for under-hood ECU placement without derating |
| Page size | 64 bytes, minimizing write latency when updating multi-byte configuration structures in single atomic operations |
Pinout & Package
AT25256B-SSPDGV-T is supplied in an 8-lead SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), RoHS-compliant and halide-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must transition high→low before SCK activity; requires pull-up ≤10 kΩ for robust power-up behavior |
| SO | Serial Data Output | Tri-state output; drives data on falling SCK edge; high-impedance when CS high or HOLD active |
| WP | Write-Protect | Hardware lock for STATUS register writes when WPEN=1; allows system-level write disable independent of software state |
| GND | Ground reference | Return path for VCC and all I/O; must be low-impedance connection to minimize noise coupling into EEPROM array |
| SI | Serial Data Input | Accepts opcodes, addresses, and data on rising SCK edge; MSb-first protocol enforces deterministic bit alignment |
| SCK | Serial Clock Input | Master-generated clock; device samples SI on rising edge and asserts SO on falling edge; supports Modes 0 and 3 |
| HOLD | Suspend Serial Input | Pauses ongoing SPI transfer without resetting internal state; enables priority interrupt handling in host MCU without data loss |
| VCC | Power supply | 2.5V–5.5V input; internal POR ensures no spurious writes during power ramp; slew rate ≤0.1 V/µs required |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C operation with full electrical characterization, eliminating need for additional automotive qualification testing |
| Block write protection (BP1/BP0) | Configurable 1/4, 1/2, or full memory array lock via STATUS register-enables secure separation of bootloader, application, and user data regions |
| HOLD pin suspend function | Halts SPI communication mid-transfer with zero-cycle recovery; preserves instruction/address context for deterministic real-time response |
| Self-timed write cycle ≤5 ms | Removes need for host MCU to poll status or manage variable write timing-simplifies firmware and guarantees worst-case latency bound |
| 1.7V–5.5V Grade 3 option | Same die supports dual-grade qualification; AT25256B-SSPDGV-T uses Grade 1 (2.5V–5.5V), but design reuse possible across voltage bands |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Storing and updating real-time calibration maps, fault codes, and adaptive learning parameters during vehicle operation. IC Role / Device Role / Timing Role: Nonvolatile configuration storage with deterministic write latency and hardware write lock to prevent corruption during power transients. Use Value: Enables field-upgradable engine tuning without requiring external backup power or complex wear-leveling firmware-reducing BOM cost and validation effort. |
Use Scenario: Retaining camera lens calibration offsets, radar sensor compensation coefficients, and lane-departure warning thresholds across ignition cycles. IC Role / Device Role / Timing Role: Automotive-grade persistent memory interfacing directly to ADAS SoC SPI bus with HOLD support for interrupt-driven updates. Use Value: Guarantees 100-year data retention at junction temperatures up to 125°C, eliminating periodic recalibration in safety-critical vision systems. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
|
Use Scenario: Saving user preferences (mirror position, seat settings, lighting profiles) and diagnostic trouble codes in distributed vehicle networks. IC Role / Device Role / Timing Role: SPI EEPROM providing secure, low-power storage with WP pin hardwired to chassis ground for tamper-resistant configuration lockdown. Use Value: Block write protection prevents accidental overwrite of factory-set security keys while allowing runtime updates to user-configurable parameters. |
Use Scenario: Logging torque sensor drift compensation values and motor phase alignment data during EPS motor commissioning and service intervals. IC Role / Device Role / Timing Role: High-reliability memory with 1,000,000 write cycles, supporting frequent recalibration events over 15+ year vehicle lifespan. Use Value: Eliminates need for external capacitor-based power-fail holdup circuitry due to ≤5 ms self-timed writes and robust POR behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95M02-DFMN6TP | 2 Mbit SPI EEPROM, 1.8V–5.5V, 20 MHz max clock, SO8 package; no HOLD pin, only WP pin | Larger capacity but lacks suspend functionality-unsuitable where host MCU must preempt EEPROM transfers | Select if higher density and faster clock are prioritized over deterministic interrupt latency |
| BR25M02FJ-WE2 | 2 Mbit SPI EEPROM, 1.7V–5.5V, AEC-Q100 Grade 1, 10 MHz max clock, TSSOP8; includes HOLD and WP pins | Same functional pinout and HOLD/WP capability, but larger memory and different page size (256 bytes) | Choose when migrating to higher-density storage while retaining identical timing and protection architecture |
Compared with AT25256B-SSPDGV-T, M95M02-DFMN6TP offers greater capacity and speed but sacrifices HOLD-based interrupt handling, whereas BR25M02FJ-WE2 provides identical automotive qualification and suspend capability at 2× memory size-making it a drop-in upgrade path for future-proofing.
Availability
AT25256B-SSPDGV-T is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, body control modules, and electric power steering systems requiring stable component supply across extended automotive temperature ranges and long production lifecycles.
Supply support for AT25256B-SSPDGV-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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with deep expertise in automotive-grade reliability and functional safety.
The AT25256B-SSPDGV-T belongs to Microchip's automotive-qualified serial EEPROM product line, designed specifically for mission-critical data storage in harsh-temperature environments where data integrity and long-term retention are non-negotiable.
FAQ
What automotive qualification does the AT25256B-SSPDGV-T meet?
The AT25256B-SSPDGV-T is AEC-Q100 qualified to Grade 1, meaning it is fully tested and characterized for operation from −40°C to +125°C ambient temperature. This qualification covers stress tests including HTOL, TC, UHAST, and ESD, confirming suitability for under-hood applications such as engine control units and transmission control modules where thermal cycling and long-term reliability are critical. AT25256B-SSPDGV-T meets all requirements defined in Rev G of the AEC-Q100 standard.
Does the AT25256B-SSPDGV-T support SPI Mode 3, and how is it configured?
Yes, the AT25256B-SSPDGV-T supports both SPI Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 0). No configuration is required-the device automatically adapts based on SCK idle state: Mode 0 expects SCK low when CS is deasserted, while Mode 3 expects SCK high. The AT25256B-SSPDGV-T samples SI on rising SCK edges and outputs SO on falling edges in both modes, ensuring interoperability with diverse host controllers without firmware changes.
How does the HOLD pin function during an active write cycle in the AT25256B-SSPDGV-T?
The HOLD pin in the AT25256B-SSPDGV-T has no effect on an ongoing internal write cycle-it only suspends serial communication (SI/SO/SCK interaction) while CS remains asserted. If a WRITE command has already triggered the self-timed 5 ms programming sequence, asserting HOLD will pause further SPI commands but will not interrupt or abort the write. The AT25256B-SSPDGV-T completes the write autonomously and sets RDY/BSY = 0 upon completion, regardless of HOLD state.
What is the factory default state of the STATUS register in the AT25256B-SSPDGV-T?
At shipment, the AT25256B-SSPDGV-T has WPEN = 0 (disabling WP pin functionality), BP1/BP0 = 00 (no array write protection), WEL = 0 (write disabled), and RDY/BSY = 0 (ready). This allows immediate read access and enables write operations only after issuing WREN. The EEPROM array itself is pre-programmed with 0xFFh bytes. These defaults ensure safe integration into new designs without unintended lockout or data corruption risks. AT25256B-SSPDGV-T retains these nonvolatile STATUS bits across power cycles.
Can the AT25256B-SSPDGV-T operate reliably at 1.8V supply voltage?
No-the AT25256B-SSPDGV-T is specified for Grade 1 operation with VCC = 2.5V to 5.5V. While some variants (e.g., AT25256B-MAHD-T) support 1.7V–5.5V, the AT25256B-SSPDGV-T variant is rated only down to 2.5V. Operating below 2.5V may result in undefined behavior, failed writes, or STATUS register corruption. For 1.8V systems, select a Grade 3 qualified variant or verify compatibility via Microchip's official DS20006269B datasheet revision history and parametric search tools.
AT25256B-SSPDGV-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:
- 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-SOIC
AT25256B-SSPDGV-T FAQ
1.How can I place an order for AT25256B-SSPDGV-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25256B-SSPDGV-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-SSPDGV-T reliable?
The price and inventory of AT25256B-SSPDGV-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-SSPDGV-T is usually 5 days.
3.What payment methods are accepted for AT25256B-SSPDGV-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25256B-SSPDGV-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25256B-SSPDGV-T?
AT25256B-SSPDGV-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25256B-SSPDGV-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-SSPDGV-T?
For technical support, including AT25256B-SSPDGV-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25256B-SSPDGV-T requirements.
6.How does Aetrix verify that AT25256B-SSPDGV-T is sourced from the original manufacturer or authorized distributors?
All AT25256B-SSPDGV-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-SSPDGV-T meets industry standards.
7.What is the process for return or replacement of AT25256B-SSPDGV-T?
All AT25256B-SSPDGV-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25256B-SSPDGV-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-SSPDGV-T part is unused and in its original packaging.
Return procedure for AT25256B-SSPDGV-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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