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Microchip Technology AT24C01C-XPD-T
- Part No.:
- AT24C01C-XPD-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24C01C-XPD-T.pdf
- Description:
- IC EEPROM 1KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,648
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Product details
Overview
AT24C01C-XPD-T from Microchip Technology (acquired Atmel) is a 1-kilobit (128 × 8) automotive-grade serial EEPROM with I²C-compatible 2-wire interface, 2.5V–5.5V supply range, -40°C to +125°C Grade 1 temperature operation, and hardware write protection via WP pin. It delivers 1,000,000 write cycles and 100-year data retention for critical nonvolatile storage in engine control units and ADAS modules.
For engineers reviewing the AT24C01C-XPD-T datasheet, AT24C01C-XPD-T pinout, AT24C01C-XPD-T application, or AT24C01C-XPD-T equivalent, key selection considerations include its TSSOP-8 package, 400kHz I²C speed at 2.5V, 8-byte page write capability, Schmitt-trigger inputs for noise immunity, and AEC-Q100 Grade 1 qualification for under-hood automotive use.
Technical Context
The AT24C01C-XPD-T implements a standard I²C protocol with start/stop condition detection, acknowledge polling, and bidirectional SDA communication using open-drain logic. Its internal architecture includes a 7-bit word address counter, page-based write buffer, and high-voltage pump for EEPROM cell programming.
It supports byte and page write modes (up to 8 bytes per page), current/random/sequential read operations, and features hardware write protection activated when WP = VCC. The device enters low-power standby mode after Stop conditions or power-up, drawing ≤4.0μA at 5.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1,024 bits (128 words × 8 bits), organized as 16 pages of 8 bytes each |
| Interface | I²C-compatible 2-wire serial bus with 400kHz max clock frequency at 2.5V |
| Supply Voltage | 2.5V to 5.5V - supports direct connection to 3.3V or 5V microcontroller I/O rails |
| Operating Temp | -40°C to +125°C (AEC-Q100 Grade 1) - qualified for engine compartment deployment |
| Write Endurance | 1,000,000 cycles - enables frequent calibration data updates in ECU firmware |
| Data Retention | 100 years at 125°C - ensures long-term reliability without refresh in safety-critical systems |
| Write Cycle Time | ≤5ms self-timed - allows deterministic timing budgeting in real-time firmware |
Pinout & Package
AT24C01C-XPD-T is housed in an 8-lead TSSOP (8X) package: 4.4mm body width, 0.65mm lead pitch, gull-wing leads, RoHS-compliant NiPdAu finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device Address Input | Hardwired LSB of 3-bit device address; enables up to eight AT24C01C devices on one I²C bus |
| A1 | Device Address Input | Mid-bit of device address; used with A0 and A2 to configure unique I²C slave address (1010xx0/1) |
| A2 | Device Address Input | MSB of device address; completes 3-bit hardware address for multi-device bus topology |
| GND | Ground Reference | System return path for VCC, SDA, SCL, and WP; must be low-impedance for noise immunity |
| VCC | Power Supply | 2.5V–5.5V main supply; powers internal logic, EEPROM array, and level-shifted I/O buffers |
| WP | Write Protect Control | Active-high hardware lock: WP = VCC disables all writes; WP = GND enables normal R/W operation |
| SCL | Serial Clock Input | Positive-edge sampled clock for synchronous data transfer; requires external pull-up resistor |
| SDA | Serial Data I/O | Open-drain bidirectional line; shared across I²C bus; requires external pull-up resistor |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs | Enables robust operation in noisy automotive environments by rejecting sub-threshold voltage transients on SCL/SDA |
| Hardware write protection | Prevents accidental overwrites during power brownouts or firmware faults via dedicated WP pin tied to VCC |
| Partial page writes | Allows writing fewer than 8 bytes in a single page cycle - reduces firmware overhead and avoids unnecessary erase cycles |
| Low standby current | Max 4.0μA at 5.0V - minimizes quiescent power draw in always-on vehicle subsystems |
| Automotive qualification | AEC-Q100 Grade 1 certified - validated for sustained operation at 125°C ambient in engine control applications |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Storing adaptive fuel trim values, fault codes, and sensor calibration offsets that persist across ignition cycles. IC Role / Device Role / Timing Role: Nonvolatile configuration memory interfaced directly to MCU via I²C; accessed during boot and runtime re-calibration. Use Value: Enables closed-loop engine optimization without battery-backed SRAM; survives 100+ years of thermal cycling in under-hood environments. | Use Scenario: Retaining camera lens distortion parameters and radar object tracking history between system resets. IC Role / Device Role / Timing Role: Persistent parameter store for vision/radar processing units; written during factory calibration and field updates. Use Value: Eliminates need for external backup capacitors or supercapacitors; meets ASIL-B data integrity requirements via write-protection and endurance rating. |
| Body Control Module (BCM) | Infotainment Head Unit |
Use Scenario: Saving user preferences (seat position, mirror angle, lighting profiles) and door lock configuration states. IC Role / Device Role / Timing Role: Low-power I²C EEPROM accessed during wake-up sequences; retains data during sleep mode (≤4μA). Use Value: Supports ultra-low-power BCM designs compliant with ISO 16750-2; withstands repeated 12V battery disconnect/reconnect events. | Use Scenario: Storing display brightness settings, audio equalizer presets, and Bluetooth pairing tables across power cycles. IC Role / Device Role / Timing Role: Secondary configuration memory co-located with application processor; accessed via shared I²C bus with other peripherals. Use Value: Provides deterministic 5ms write latency for UI responsiveness; immune to ESD-induced corruption due to Schmitt-trigger inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STMicroelectronics M24C01-RMN6TP | Same 1K density, TSSOP-8, I²C, 1.7–5.5V, but rated only to 105°C (Grade 2) | Limited to cabin-mounted modules; not qualified for under-hood use above 105°C | Select when cost sensitivity outweighs extended temperature requirement |
| Rohm BR24G01FJ-WE2 | 1K, TSSOP-8, I²C, 1.7–5.5V, -40°C to +105°C, built-in write protect register (no WP pin) | Software-configurable protection; lacks hardware-level WP pin for fail-safe lockout | Choose when firmware-controlled write enable is preferred over hardware lock |
Compared with M24C01-RMN6TP and BR24G01FJ-WE2, the AT24C01C-XPD-T uniquely combines Grade 1 temperature rating (-40°C to +125°C), dedicated hardware WP pin, and 400kHz I²C speed at 2.5V - making it the only option qualified for direct integration into powertrain ECUs without derating.
Availability
AT24C01C-XPD-T is available at Aetrix Electronics and suitable for engine control units, ADAS sensors, body control modules, and infotainment head units requiring stable component supply across automotive production lifecycles.
Supply support for AT24C01C-XPD-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 acquired Atmel in 2016 and maintains full product support, qualification, and manufacturing continuity for the AT24C01C-XPD-T.
This device belongs to the AT24CxxC automotive EEPROM family, designed specifically for AEC-Q100-compliant nonvolatile storage in harsh-temperature automotive subsystems where reliability, data integrity, and long-term retention are mandatory.
FAQ
What is the maximum I²C clock frequency supported by the AT24C01C-XPD-T?
The AT24C01C-XPD-T supports up to 400kHz I²C clock frequency when operated at VCC = 2.5V. At higher supply voltages (e.g., 5.0V), timing margins improve, but the device remains fully compatible with standard Fast-mode I²C controllers. AC characteristics including tLOW (1200ns min) and tHIGH (600ns min) are guaranteed across the full -40°C to +125°C temperature range.
Does the AT24C01C-XPD-T require external pull-up resistors on SDA and SCL lines?
Yes, the AT24C01C-XPD-T requires external pull-up resistors on both SDA and SCL lines because its I/O pins are open-drain. Recommended values are 1.3kΩ for 2.5V/5.5V operation and 10kΩ for 1.7V operation, per the datasheet's AC measurement conditions. These ensure proper rise times (≤300ns) and noise margin compliance.
How does the write protect (WP) pin function on the AT24C01C-XPD-T?
When the WP pin is driven high (connected to VCC), the AT24C01C-XPD-T disables all write operations - including byte, page, and sequential writes - across the entire memory array. When WP is low (connected to GND), normal read and write functions operate. This hardware-level lock prevents corruption during power transitions or firmware errors.
What is the page size and write latency for the AT24C01C-XPD-T?
The AT24C01C-XPD-T has an 8-byte page size and a maximum self-timed write cycle time of 5ms. During this period, the device ignores all I²C commands until the internal programming completes. Acknowledge polling (repeated Start + device address) can be used to detect completion without fixed delay loops.
Is the AT24C01C-XPD-T pin-compatible with other members of the AT24CxxC family?
Yes, the AT24C01C-XPD-T shares identical pinout, package dimensions, and I²C protocol with AT24C02C-XPD-T, AT24C04C-XPD-T, and AT24C08C-XPD-T in TSSOP-8. However, memory size, page size (8 vs. 16 bytes), and device addressing bits (A0/A1/A2 usage) differ - requiring firmware adjustments when substituting densities.
AT24C01C-XPD-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 128 x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 1 MHz
- 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-TSSOP
AT24C01C-XPD-T FAQ
1.How can I place an order for AT24C01C-XPD-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C01C-XPD-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 AT24C01C-XPD-T reliable?
The price and inventory of AT24C01C-XPD-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C01C-XPD-T is usually 5 days.
3.What payment methods are accepted for AT24C01C-XPD-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C01C-XPD-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C01C-XPD-T?
AT24C01C-XPD-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C01C-XPD-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 AT24C01C-XPD-T?
For technical support, including AT24C01C-XPD-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C01C-XPD-T requirements.
6.How does Aetrix verify that AT24C01C-XPD-T is sourced from the original manufacturer or authorized distributors?
All AT24C01C-XPD-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 AT24C01C-XPD-T meets industry standards.
7.What is the process for return or replacement of AT24C01C-XPD-T?
All AT24C01C-XPD-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C01C-XPD-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 AT24C01C-XPD-T part is unused and in its original packaging.
Return procedure for AT24C01C-XPD-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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