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Microchip Technology AT24C256C-SSPD-T
- Part No.:
- AT24C256C-SSPD-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT24C256C-SSPD-T.pdf
- Description:
- IC EEPROM 256KBIT I2C 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,422
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Product details
Overview
AT24C256C-SSPD-T from Microchip Technology is a 256-Kbit (32,768 × 8) automotive-grade I²C serial EEPROM with AEC-Q100 Grade 1 qualification (-40°C to +125°C), 1.7V–5.5V supply range, and 64-byte page write capability. It serves as nonvolatile configuration storage in engine control units, ADAS sensor modules, and body electronics where robust data retention and low-power operation are critical.
For engineers reviewing the AT24C256C-SSPD-T datasheet, AT24C256C-SSPD-T pinout, AT24C256C-SSPD-T application, or AT24C256C-SSPD-T equivalent, key selection criteria include I²C Fast Mode (400 kHz) timing compliance, hardware write-protection via WP pin, 1,000,000 write-cycle endurance, and SOIC-8 package compatibility with automotive PCB layouts.
Technical Context
The AT24C256C-SSPD-T operates as an I²C slave device with open-drain SDA/SCL interfaces, Schmitt-triggered inputs, and integrated spike suppression filters for noise immunity in electrically harsh automotive environments. Its memory array is organized as 512 pages × 64 bytes, supporting random/sequential reads and partial page writes.
It implements a hardware-based write-protect function via the WP pin (active-high), internal pull-downs on A0–A2 address pins for flexible bus addressing (up to 8 devices), and Power-on Reset (POR) with 100 µs tPUP delay to prevent spurious writes during power-up transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8 bits); supports firmware parameter storage and calibration data logging in ECUs. |
| Interface | I²C two-wire serial; compatible with standard and fast modes (100 kHz / 400 kHz) for integration with microcontrollers without additional protocol logic. |
| Supply Voltage | 1.7V–5.5V (Grade 3) / 2.5V–5.5V (Grade 1); enables direct connection to 3.3V or 5V automotive domains without level-shifting. |
| Operating Temperature | -40°C to +125°C (AEC-Q100 Grade 1); qualified for under-hood and transmission control module deployment. |
| Write Endurance | 1,000,000 cycles; ensures reliable reprogramming over full vehicle lifetime in adaptive systems like seat position memory. |
| Data Retention | 100 years at 55°C; guarantees long-term integrity of safety-critical calibration maps without refresh overhead. |
| Active Current | ≤3.0 mA max at 5.0V/400 kHz; minimizes power impact during frequent read/write operations in always-on modules. |
| Standby Current | ≤6.0 μA max at 5.0V; reduces quiescent drain in sleep-mode vehicle networks (e.g., LIN gateway backup storage). |
Pinout & Package
AT24C256C-SSPD-T is supplied in an 8-lead SOIC package (SSPD = Small Outline Integrated Circuit, Plastic, 150 mil width). Pin assignments are standardized across SOIC, TSSOP, and UDFN variants per Microchip DS20006270B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired to GND/VCC to configure one of eight possible I²C slave addresses (1010xxxA); enables multi-device bus topology. |
| A1 | Device Address Input | Second bit of 3-bit hardware address; allows up to eight identical AT24C256C-SSPD-T devices on same I²C bus without software arbitration. |
| A2 | Device Address Input | Third bit of 3-bit hardware address; internal pull-down ensures default GND state if left unconnected, simplifying single-device designs. |
| GND | Ground Reference | System ground return path; must be low-impedance to maintain noise margin for I²C signaling in noisy automotive harnesses. |
| SDA | Serial Data I/O | Open-drain bidirectional line; requires external 1.3 kΩ pull-up (400 kHz) and must be wire-ORed with other I²C slaves on same bus. |
| SCL | Serial Clock Input | Master-generated clock; rising edge latches input data, falling edge clocks output data; Schmitt trigger ensures noise immunity. |
| WP | Write-Protect Control | Hardware lock: tied to VCC disables all writes to entire memory array; tied to GND enables full read/write access. |
| VCC | Power Supply | 1.7V–5.5V input; slew rate ≤0.1 V/µs required to ensure proper POR behavior and avoid spurious writes during power ramp. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive AEC-Q100 Grade 1 Qualification | Validated for -40°C to +125°C operation with full reliability testing (HTOL, TC, ESD >4 kV), enabling use in powertrain and chassis control units. |
| 64-Byte Page Write Mode | Reduces write time vs. byte-write: 5 ms max self-timed cycle for up to 64 bytes, improving firmware update throughput in telematics modules. |
| Hardware Write Protection (WP Pin) | Prevents accidental overwrites during system boot or brown-out conditions without requiring firmware intervention or register writes. |
| Schmitt Trigger Inputs with Filtering | Suppresses EMI-induced glitches on SDA/SCL lines in 12V/42V vehicle electrical systems, eliminating need for external RC filtering. |
| Low Standby Current (≤6 μA) | Enables permanent connection to battery-backed rails in infotainment head units without compromising sleep-mode current budgets. |
| Green RoHS/Halide-Free Packaging | Meets automotive environmental compliance requirements (e.g., ELV, REACH) with lead-free matte tin finish on SOIC leads. |
Applications
| Engine Control Unit (ECU) Calibration Storage | Advanced Driver Assistance Systems (ADAS) Sensor Configuration |
|---|---|
Use Scenario: Storing real-time calibrated parameters (fuel trim, ignition timing maps) that persist across ignition cycles and survive battery disconnects. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced via I²C to main MCU; accessed during boot and runtime recalibration events. Use Value: 100-year data retention and 1M write cycles ensure calibration integrity over 15+ year vehicle service life without degradation. | Use Scenario: Holding camera/lidar sensor alignment offsets, thermal compensation coefficients, and fault history logs in autonomous driving domain controllers. IC Role / Device Role / Timing Role: Dedicated I²C EEPROM for safety-critical configuration data, isolated from main application flash to prevent corruption during OTA updates. Use Value: AEC-Q100 Grade 1 rating guarantees operation at +125°C near power electronics, while WP pin prevents runtime overwrite during sensor initialization. |
| Body Control Module (BCM) User Preference Memory | Electric Power Steering (EPS) Motor Profile Storage |
Use Scenario: Retaining driver-specific settings (mirror position, seat memory, lighting preferences) powered from always-on battery rail. IC Role / Device Role / Timing Role: Low-quiescent-current (≤6 μA) I²C EEPROM providing persistent storage independent of ignition state. Use Value: Ultra-low standby current extends battery life in parked vehicles; SOIC-8 footprint simplifies layout in space-constrained BCM PCBs. | Use Scenario: Storing motor torque curves, temperature derating tables, and fault recovery profiles used by EPS MCU during active steering assist. IC Role / Device Role / Timing Role: High-reliability configuration store accessed during EPS startup and dynamic torque calculation loops. Use Value: 400 kHz I²C Fast Mode enables rapid profile loading (<10 ms), and 125°C rating ensures stability near EPS motor drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics M24C256-RMN6TP | Same 256-Kbit I²C EEPROM, AEC-Q100 Grade 1, but uses different internal address mapping and has 10 ms max write cycle vs. 5 ms. | Compatible in calibration storage roles but requires firmware validation for timing-critical write sequences. | Select when ST ecosystem alignment or dual-sourcing is required; verify WP pin behavior and ACK polling timing against AT24C256C-SSPD-T. |
| ON Semiconductor CAT24C256HU4IGT3 | 256-Kbit I²C EEPROM with AEC-Q100 Grade 1, but rated for 1.8V–5.5V only; lacks 1.7V support and has 3.5 mA max active current. | Suitable for 3.3V-only domains but not for 1.8V microcontroller interfaces or legacy 5V systems requiring 1.7V minimum. | Choose for cost-sensitive 3.3V ADAS modules where 1.7V operation is unnecessary; confirm SOIC-8 mechanical compatibility and WP pin logic polarity. |
Compared with M24C256-RMN6TP and CAT24C256HU4IGT3, the AT24C256C-SSPD-T offers faster 5 ms write cycles, broader 1.7V–5.5V operation, and tighter 6 μA standby current-making it optimal for multi-rail automotive systems demanding lowest power and highest timing margin.
Availability
AT24C256C-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 extended automotive production lifecycles.
Supply support for AT24C256C-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 is a leading provider of microcontrollers, analog, and Flash-IP solutions, with deep expertise in automotive-grade semiconductors and functional safety certification.
The AT24C256C-SSPD-T belongs to Microchip's automotive-qualified serial EEPROM product line, designed specifically for robust, low-power nonvolatile storage in safety-critical vehicle subsystems.
FAQ
What is the maximum I²C clock frequency supported by the AT24C256C-SSPD-T?
The AT24C256C-SSPD-T supports I²C Fast Mode operation up to 400 kHz, with guaranteed AC timing compliance including tLOW ≥1200 ns and tHIGH ≥600 ns at VCC = 2.5V–5.5V. This enables high-throughput configuration reads in time-sensitive automotive applications such as EPS startup sequences.
Does the AT24C256C-SSPD-T require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C256C-SSPD-T requires external pull-up resistors on both SDA and SCL lines due to its open-drain architecture. For 400 kHz operation, Microchip specifies a maximum SDA pull-up of 1.3 kΩ; SCL may use the same value or higher depending on bus capacitance and master drive strength.
How does the Write-Protect (WP) pin function on the AT24C256C-SSPD-T?
When the WP pin is driven high (VCC), the AT24C256C-SSPD-T inhibits all write operations to its entire memory array. When pulled low (GND), normal read/write access is enabled. If left floating, the internal pull-down defaults WP to GND, but Microchip recommends hardwiring for deterministic behavior in automotive environments.
What is the memory organization of the AT24C256C-SSPD-T?
The AT24C256C-SSPD-T organizes its 256 Kbit capacity as 32,768 words × 8 bits, segmented into 512 pages of 64 bytes each. This structure enables efficient page-write operations and supports both random and sequential read modes with address auto-increment.
Is the AT24C256C-SSPD-T compatible with standard I²C protocol stacks?
Yes, the AT24C256C-SSPD-T implements full I²C protocol compliance including Start/Stop conditions, ACK/NACK handshaking, 7-bit slave addressing with R/W bit, and 14-bit memory addressing. It interoperates with standard Linux i2c-tools, STM32 HAL_I2C, and AUTOSAR I2C drivers without modification.
AT24C256C-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:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 400 kHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- 900 ns
- 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
AT24C256C-SSPD-T FAQ
1.How can I place an order for AT24C256C-SSPD-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256C-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 AT24C256C-SSPD-T reliable?
The price and inventory of AT24C256C-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 AT24C256C-SSPD-T is usually 5 days.
3.What payment methods are accepted for AT24C256C-SSPD-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256C-SSPD-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256C-SSPD-T?
AT24C256C-SSPD-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256C-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 AT24C256C-SSPD-T?
For technical support, including AT24C256C-SSPD-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256C-SSPD-T requirements.
6.How does Aetrix verify that AT24C256C-SSPD-T is sourced from the original manufacturer or authorized distributors?
All AT24C256C-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 AT24C256C-SSPD-T meets industry standards.
7.What is the process for return or replacement of AT24C256C-SSPD-T?
All AT24C256C-SSPD-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256C-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 AT24C256C-SSPD-T part is unused and in its original packaging.
Return procedure for AT24C256C-SSPD-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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