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Microchip Technology AT24C256C-MAPD-E
- Part No.:
- AT24C256C-MAPD-E
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT24C256C-MAPD-E.pdf
- Description:
- IC EEPROM 256KBIT I2C 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,570
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Product details
Overview
AT24C256C-MAPD-E 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 delivers ultra-low standby current (≤6 μA), 1M write-cycle endurance, and 100-year data retention for nonvolatile storage in engine control units, ADAS sensors, and body electronics.
For engineers reviewing the AT24C256C-MAPD-E datasheet, AT24C256C-MAPD-E pinout, AT24C256C-MAPD-E application, or AT24C256C-MAPD-E equivalent, key selection criteria include I²C Fast Mode (400 kHz) timing compliance, hardware write-protect (WP) implementation, 8-pin SOIC package footprint, and Grade 1 temperature operation for under-hood deployment.
Technical Context
The AT24C256C-MAPD-E operates as an I²C slave device with fixed 7-bit address prefix '1010' and three programmable address bits (A0–A2), enabling up to eight devices on one bus. Its internal memory is organized as 512 pages × 64 bytes, supporting both random and sequential read modes plus partial-page writes.
It integrates Schmitt-trigger inputs and noise-filtered I/O for robust operation in electrically noisy automotive environments. The device features a Power-on Reset (POR) circuit with 100 µs tPUP delay and supports software reset via SCL clocking - critical for recovery after bus contention or power glitches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 256 Kbit (32,768 × 8 bits), mapped as 512 pages of 64 bytes - enables efficient firmware parameter logging without external address latching. |
| Interface | I²C two-wire serial interface, compliant with Standard (100 kHz) and Fast Mode (400 kHz) - interoperable with most microcontrollers without protocol translation. |
| Supply Voltage | 1.7V to 5.5V (Grade 3) / 2.5V to 5.5V (Grade 1) - supports direct connection to 1.8V, 3.3V, and 5V MCU I/O domains. |
| Write Endurance | 1,000,000 cycles per memory location - ensures reliable calibration data updates over full vehicle lifetime (15+ years). |
| Data Retention | 100 years at 55°C - guarantees long-term integrity of safety-critical configuration data without refresh. |
| Standby Current | ≤6 μA at VCC = 5.0V - minimizes quiescent power draw in always-on vehicle modules (e.g., gateway ECUs). |
| Write Cycle Time | ≤5 ms maximum self-timed write - eliminates need for external polling delay; ACK polling supported for precise timing control. |
Pinout & Package
AT24C256C-MAPD-E is housed in an 8-lead SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), compatible with standard surface-mount assembly processes and automotive reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardware-selectable bit for multi-device I²C addressing; internally pulled down if floating - requires explicit tie-high/tie-low for deterministic bus mapping. |
| A1 | Device Address Input | Second hardware address bit; enables up to eight unique addresses on shared I²C bus - essential for distributed sensor networks. |
| A2 | Device Address Input | Third hardware address bit; completes 3-bit slave address (A2–A0) alongside fixed '1010' prefix - defines full 7-bit I²C address. |
| GND | Ground Reference | System ground return path; must be low-impedance connection to minimize noise coupling into sensitive I²C signaling. |
| SDA | Serial Data Line | Open-drain bidirectional I/O; requires external pull-up resistor ≤10 kΩ - shares bus with other open-drain devices (e.g., sensors, MCUs). |
| SCL | Serial Clock Line | Input-only clock line; must be pulled high externally - timing-critical path governing all read/write synchronization (tLOW/tHIGH min/max defined). |
| WP | Write-Protect Control | Hardware lock for full-array write inhibition when tied to VCC - prevents accidental overwrites during ECU boot or firmware update sequences. |
| VCC | Power Supply | Primary voltage rail (1.7–5.5V); includes internal POR circuit requiring ≥100 µs stable VCC before first command - mandates proper power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for -40°C to +125°C operation - certified for placement in engine compartments and transmission control modules. |
| 64-byte page write mode | Enables burst writes up to 64 bytes per cycle without address increment overhead - reduces I²C transaction count by >90% vs. byte-write for block updates. |
| Schmitt-trigger & filtered inputs | Suppresses EMI-induced glitches on SDA/SCL - maintains communication integrity in high-noise environments (e.g., near ignition systems). |
| Hardware write-protect (WP) | Dedicated pin disables all write operations when driven high - provides fail-safe protection independent of firmware state or bus activity. |
| Ultra-low standby current | ≤6 μA at 5.0V - extends battery life in always-on telematics and remote keyless entry modules during sleep mode. |
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 parameter storage with guaranteed write completion before engine shutdown. Use Value: Maintains calibrated engine behavior across 1M+ key cycles using 100-year-retention memory cells - eliminates recalibration after battery disconnect. |
Use Scenario: Logging camera calibration offsets, radar fusion parameters, and sensor alignment data during vehicle production and field updates. IC Role / Device Role / Timing Role: Secure, tamper-resistant configuration storage accessible via I²C during boot and OTA updates. Use Value: Enables zero-downtime calibration updates via WP pin control - prevents corruption during simultaneous CAN/I²C traffic bursts. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
|
Use Scenario: Persisting user preferences (window positions, mirror angles, lighting profiles) and door-lock event history. IC Role / Device Role / Timing Role: Low-power, high-reliability storage interfaced directly to 3.3V microcontroller GPIOs. Use Value: Achieves <1 µA average system standby current using 6 μA max EEPROM ISB - meets OEM "parking mode" energy budgets. |
Use Scenario: Recording torque sensor zero-point drift compensation and motor phase alignment data during EPS initialization. IC Role / Device Role / Timing Role: Safety-critical nonvolatile storage with AEC-Q100 Grade 1 thermal margin for under-hood mounting. Use Value: Guarantees 125°C operational stability and 1M write endurance - supports lifetime recalibration without field replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST M24C256-RMN6TP | Same 256-Kbit density and I²C interface, but AEC-Q100 Grade 2 (-40°C to +105°C); 1.7–5.5V supply; no internal WP pull-down. | Limited to under-dash modules; lacks Grade 1 thermal margin for engine bay use. | Select when cost sensitivity outweighs extended temperature requirement and external WP logic is acceptable. |
| ON Semiconductor CAT24C256HU4IGT3 | 256-Kbit I²C EEPROM, AEC-Q100 Grade 1 qualified, but only supports 100 kHz Standard Mode - no Fast Mode (400 kHz) support. | Not suitable for high-throughput parameter logging where fast write cycles reduce bus occupancy time. | Choose only for legacy designs constrained to Standard Mode timing or where lower-speed operation simplifies EMC filtering. |
Compared with ST M24C256-RMN6TP and CAT24C256HU4IGT3, the AT24C256C-MAPD-E uniquely combines Grade 1 temperature rating, 400 kHz Fast Mode, and internal WP pull-down - making it the only option qualified for real-time, high-speed, under-hood EEPROM applications without external biasing components.
Availability
AT24C256C-MAPD-E is available at Aetrix Electronics and suitable for engine control units, ADAS sensor nodes, body control modules, and electric power steering systems requiring stable component supply across automotive production lifecycles.
Supply support for AT24C256C-MAPD-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 ISO/TS 16949-certified automotive manufacturing facilities.
The AT24C256C-MAPD-E belongs to Microchip's AEC-Q100-qualified serial EEPROM product line, engineered specifically for automotive subsystems demanding high reliability, extended temperature operation, and robust I²C communication in harsh electrical environments.
FAQ
What is the operating temperature range for the AT24C256C-MAPD-E?
The AT24C256C-MAPD-E is rated for AEC-Q100 Grade 1 operation from -40°C to +125°C, validated for continuous use in engine compartments and transmission control units. This specification is confirmed in the DS20006270B datasheet Section 4.2 and applies specifically to the MAPD-E variant in SOIC packaging.
Does the AT24C256C-MAPD-E support I²C Fast Mode (400 kHz)?
Yes, the AT24C256C-MAPD-E fully supports I²C Fast Mode up to 400 kHz, as specified in Table 4-3 of the DS20006270B datasheet. Its AC timing parameters (tLOW, tHIGH, tSU.STA, etc.) are characterized and guaranteed across the full Grade 1 temperature range.
How does the Write-Protect (WP) pin function on the AT24C256C-MAPD-E?
When the WP pin is driven high (to VCC), the AT24C256C-MAPD-E inhibits all write operations to its entire memory array. When WP is low (GND) or floating (internally pulled down), normal writes are enabled. This hardware-level protection operates independently of I²C commands and remains active during power transitions.
What is the maximum write cycle time for the AT24C256C-MAPD-E?
The AT24C256C-MAPD-E has a maximum self-timed write cycle time of 5 ms, applicable to both byte and page writes. This value is guaranteed across all operating voltages and temperatures per Table 4-3 in DS20006270B and enables deterministic firmware timeout handling without external delay loops.
Is the AT24C256C-MAPD-E pin-compatible with the AT24C256C-MAHM-E?
No - the AT24C256C-MAPD-E uses an 8-lead SOIC package, while the AT24C256C-MAHM-E is in an 8-lead TSSOP package. Although both share identical pin functions and ordering (A0–A2, GND, SDA, SCL, WP, VCC), their physical footprints, thermal characteristics, and reflow profiles differ; PCB layout is not interchangeable without redesign.
AT24C256C-MAPD-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:
- 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-UDFN (2x3)
AT24C256C-MAPD-E FAQ
1.How can I place an order for AT24C256C-MAPD-E through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C256C-MAPD-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 AT24C256C-MAPD-E reliable?
The price and inventory of AT24C256C-MAPD-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C256C-MAPD-E is usually 5 days.
3.What payment methods are accepted for AT24C256C-MAPD-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C256C-MAPD-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C256C-MAPD-E?
AT24C256C-MAPD-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C256C-MAPD-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 AT24C256C-MAPD-E?
For technical support, including AT24C256C-MAPD-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C256C-MAPD-E requirements.
6.How does Aetrix verify that AT24C256C-MAPD-E is sourced from the original manufacturer or authorized distributors?
All AT24C256C-MAPD-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 AT24C256C-MAPD-E meets industry standards.
7.What is the process for return or replacement of AT24C256C-MAPD-E?
All AT24C256C-MAPD-E units undergo pre-shipment inspection (PSI). If there is an issue with AT24C256C-MAPD-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 AT24C256C-MAPD-E part is unused and in its original packaging.
Return procedure for AT24C256C-MAPD-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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