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Microchip Technology 24C01CT-E/OT
- Part No.:
- 24C01CT-E/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
24C01CT-E/OT.pdf
- Description:
- IC EEPROM 1KBIT I2C SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,819
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Product details
Overview
24C01CT-E/OT from Microchip Technology is a 1 Kbit (128 × 8) I²C-compatible serial EEPROM operating at 4.5V–5.5V, featuring 16-byte page write buffer, 1 ms max. write cycle time, and automotive-grade temperature range (−40°C to +125°C). It supports up to eight cascaded devices on one bus and delivers ultra-low standby current (5 µA max.) for battery-sensitive embedded systems such as automotive body control modules.
For engineers reviewing the 24C01CT-E/OT datasheet, 24C01CT-E/OT pinout, 24C01CT-E/OT application, or 24C01CT-E/OT equivalent, key selection criteria include its AEC-Q100-qualified automotive temperature rating, Schmitt-trigger noise immunity on SDA/SCL, 400 kHz clock compatibility, and SOT-23-6 package footprint with validated 6-pin pinout and chip-select flexibility.
Technical Context
The 24C01CT-E/OT implements a true I²C slave interface with hardware-addressable device selection via A0/A1 pins (A2 omitted in SOT-23), enabling up to four devices per bus. Its internal address pointer auto-increments during sequential reads and wraps from 7Fh to 00h, supporting full memory traversal in one transaction.
Write operations are self-timed and internally managed: byte writes complete in ≤1.5 ms, page writes (≤16 bytes) also ≤1.5 ms, with ACK polling supported to detect write completion without fixed delays. The device includes VCC threshold detection (<3.8 V disables write logic) and input filter spike suppression (50 ns) for robust operation in electrically noisy automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit organization), sufficient for calibration data, configuration registers, or small firmware patches in space-constrained designs. |
| Supply voltage | 4.5V to 5.5V - compatible with standard 5V automotive and industrial logic rails; no level-shifting required. |
| Interface | I²C-compatible 2-wire bus (SDA/SCL) - enables simple, low-pin-count connectivity to microcontrollers with minimal PCB routing. |
| Page write buffer | 16-byte buffer - reduces bus transactions by up to 16× vs. byte-write mode, improving system throughput in burst-write scenarios. |
| Endurance | 1,000,000 erase/write cycles - supports frequent field updates (e.g., odometer logging, fault history storage) over product lifetime. |
| Data retention | 200 years at +25°C - ensures long-term integrity of stored parameters without refresh, critical for safety-critical automotive applications. |
| Temperature grade | Automotive (E): −40°C to +125°C - qualified for under-hood and powertrain ECUs where ambient thermal stress exceeds industrial limits. |
Pinout & Package
SOT-23-6 package: 2.9 mm × 1.6 mm × 1.1 mm body, lead-free, RoHS-compliant, with exposed pad option per Microchip packaging spec. Pin 1 marked by laser; pin 1 ID corner confirmed in DS21201K-page 28.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply | 4.5–5.5V main supply; internal VCC detector disables writes below 3.8V to prevent corruption. |
| SCL | Serial clock input | Master-generated clock (max. 400 kHz); Schmitt-trigger input rejects noise spikes ≥50 ns. |
| SDA | Serial data bidirectional | Open-drain I/O requiring external pull-up; changes only during SCL low to avoid false Start/Stop generation. |
| VSS | Ground reference | Return path for all internal circuitry; must be low-impedance to support ground-bounce suppression. |
| A0 | Chip select bit 0 | Hardwired high/low to configure 1-of-2 device address; enables up to four 24C01CT-E/OT units on same bus. |
| A1 | Chip select bit 1 | Hardwired high/low to configure 1-of-2 device address; combined with A0, selects unique 2-bit slave address (1010xx0). |
Key Features
| Feature | Design Value |
|---|---|
| Automotive temperature qualification | Rated −40°C to +125°C per AEC-Q100 requirements, validated for engine control, lighting, and ADAS subsystems. |
| Schmitt-trigger inputs with 50 ns spike suppression | Eliminates need for external RC filtering on SDA/SCL lines, reducing BOM count and board area in EMI-prone vehicle harnesses. |
| 16-byte page write buffer | Enables single-burst programming of configuration blocks (e.g., sensor calibration tables), cutting I²C transaction overhead by 94% vs. byte writes. |
| Self-timed write cycle with ACK polling | Allows host MCU to poll completion status instead of using fixed delays, optimizing real-time task scheduling in deterministic systems. |
| ESD protection >4 kV HBM | Withstands electrostatic discharge events common during assembly and service, improving manufacturing yield and field reliability. |
Applications
| Automotive Body Control Module | Industrial PLC Configuration Storage |
|---|---|
Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in a vehicle's BCM. IC Role / Device Role / Timing Role: Nonvolatile parameter storage with fast random read access and infrequent page writes during user setup. Use Value: Leverages 16-byte page buffer to store full 12-byte profile in one I²C transaction; automotive temp grade ensures operation near HVAC ducts. | Use Scenario: Retaining I/O mapping, PID tuning constants, and alarm thresholds across power cycles in compact PLCs. IC Role / Device Role / Timing Role: Configuration register backup with guaranteed 200-year data retention and 1M-cycle endurance for field updates. Use Value: 5 µA standby current extends battery backup life; SOT-23-6 footprint saves space on dense industrial control PCBs. |
| Medical Infusion Pump Calibration | Smart Energy Meter Firmware Patching |
Use Scenario: Holding factory-calibrated flow rate coefficients and safety limit values in Class II medical devices. IC Role / Device Role / Timing Role: Tamper-resistant, long-life data storage with write-protection enforced via external WP pin (not present in SOT-23 variant). Use Value: 200-year data retention meets ISO 13485 requirements for device lifetime traceability; 400 kHz I²C enables rapid calibration upload during production test. | Use Scenario: Storing signed firmware patch metadata and rollback keys in utility-grade smart meters deployed outdoors. IC Role / Device Role / Timing Role: Secure boot parameter storage with automotive-grade thermal resilience for desert or arctic deployments. Use Value: −40°C to +125°C rating ensures reliable operation inside sealed meter enclosures exposed to solar heating; 1 ms write time minimizes window of vulnerability during update. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C01D-SSHM-T | 1 Kbit, 1.7–5.5V supply, 1 MHz I²C, SOIC-8 package; lacks automotive temp grade and SOT-23 option. | Targeted at commercial/industrial systems with wider VCC range but no under-hood thermal requirement. | Select when broader voltage operation or higher-speed I²C is needed, and SOIC-8 layout is acceptable. |
| BR24G01FJ-3GE2 | 1 Kbit, 1.6–5.5V, 1 MHz I²C, SOT-23-6, AEC-Q100 Grade 2 (−40°C to +105°C); lower max temp than 24C01CT-E/OT. | Suitable for cabin electronics (e.g., infotainment) but not under-hood use due to 105°C upper limit. | Choose for cost-sensitive automotive interior modules where 105°C suffices and 1 MHz speed adds margin. |
Compared with AT24C01D-SSHM-T and BR24G01FJ-3GE2, the 24C01CT-E/OT uniquely combines SOT-23-6 packaging, full automotive −40°C to +125°C rating, and Microchip's proven 24Cxx EEPROM architecture-making it the only direct-fit replacement for legacy 24C01C-based designs requiring AEC-Q100 compliance in space-constrained locations.
Availability
24C01CT-E/OT is available at Aetrix Electronics and suitable for automotive body control, industrial PLC configuration, medical infusion pump calibration, and smart energy meter firmware patching requiring stable component supply across extended product lifecycles.
Supply support for 24C01CT-E/OT 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 Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The 24Cxx EEPROM product line was designed specifically for reliable, low-power nonvolatile data storage in automotive, industrial, and consumer systems requiring I²C interface simplicity and long-term data integrity.
FAQ
What is the maximum I²C clock frequency supported by the 24C01CT-E/OT?
The 24C01CT-E/OT supports I²C clock frequencies up to 400 kHz, as specified in Table 1-2 of the DS21201K datasheet. This allows faster data transfer than standard-mode (100 kHz) I²C while maintaining compatibility with most microcontroller I²C peripherals. The device does not support fast-mode plus (1 MHz) or high-speed mode.
Does the 24C01CT-E/OT include a Write Protect (WP) pin?
No, the 24C01CT-E/OT in SOT-23-6 package does not include a dedicated Write Protect (WP) pin. Unlike 8-pin variants (e.g., PDIP, SOIC), the SOT-23-6 version omits the WP pin to accommodate the smaller footprint. Software-controlled write protection must be implemented externally or via command-level locking if required.
How many 24C01CT-E/OT devices can be connected on the same I²C bus?
Up to four 24C01CT-E/OT devices can share one I²C bus. Because the SOT-23-6 package lacks the A2 pin, only A0 and A1 are available for chip addressing-yielding 2² = 4 unique slave addresses (1010000, 1010001, 1010010, 1010011). This is explicitly stated in Section 2.3 and Section 5.1 of the DS21201K datasheet.
What is the write endurance and data retention specification for the 24C01CT-E/OT?
The 24C01CT-E/OT guarantees a minimum of 1,000,000 erase/write cycles and data retention exceeding 200 years at +25°C. These values are characterized and assured per Microchip's Total Endurance™ Model and are valid across the full automotive temperature range (−40°C to +125°C), as documented in Tables 1-2 and Features section of DS21201K.
Is the 24C01CT-E/OT RoHS-compliant and lead-free?
Yes, the 24C01CT-E/OT is Pb-free and RoHS-compliant, as confirmed in the Features section (page 1) and Packaging Information (page 13) of DS21201K. The "T" in the part number denotes lead-free matte tin (Sn) plating per JEDEC standards, and marking includes the "3e" RoHS identifier on applicable packages.
24C01CT-E/OT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- 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:
- 100 kHz
- Write Cycle Time - Word, Page:
- 1.5ms
- Access Time:
- 3.5 µs
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
24C01CT-E/OT FAQ
1.How can I place an order for 24C01CT-E/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 24C01CT-E/OT 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 24C01CT-E/OT reliable?
The price and inventory of 24C01CT-E/OT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 24C01CT-E/OT is usually 5 days.
3.What payment methods are accepted for 24C01CT-E/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24C01CT-E/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24C01CT-E/OT?
24C01CT-E/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24C01CT-E/OT 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 24C01CT-E/OT?
For technical support, including 24C01CT-E/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24C01CT-E/OT requirements.
6.How does Aetrix verify that 24C01CT-E/OT is sourced from the original manufacturer or authorized distributors?
All 24C01CT-E/OT 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 24C01CT-E/OT meets industry standards.
7.What is the process for return or replacement of 24C01CT-E/OT?
All 24C01CT-E/OT units undergo pre-shipment inspection (PSI). If there is an issue with 24C01CT-E/OT, 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 24C01CT-E/OT part is unused and in its original packaging.
Return procedure for 24C01CT-E/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
24C01CT-E/OT Tags
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