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Microchip Technology 24C01CT-I/OT
- Part No.:
- 24C01CT-I/OT
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-6
- Datasheet:
-
24C01CT-I/OT.pdf
- Description:
- IC EEPROM 1KBIT I2C SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:958
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Product details
Overview
24C01CT-I/OT from Microchip Technology is a 1 Kbit (128 × 8) I²C-compatible serial EEPROM operating from 4.5V to 5.5V, featuring 16-byte page write buffer, 1 ms max. write cycle time, and industrial temperature range (–40°C to +85°C). It uses Schmitt-trigger inputs and slope-controlled outputs for noise immunity on shared buses in embedded control and sensor calibration systems.
For engineers reviewing the 24C01CT-I/OT datasheet, 24C01CT-I/OT pinout, 24C01CT-I/OT application, or 24C01CT-I/OT equivalent, this device supports cascaded multi-device I²C configurations up to eight units, delivers >1 million erase/write cycles with >200-year data retention, and requires no external high-voltage programming circuitry.
Technical Context
The 24C01CT-I/OT implements a two-wire I²C interface with master-controlled clock (SCL) and bidirectional open-drain data (SDA), supporting both byte and page write modes. Its internal address pointer auto-increments during sequential reads and wraps at 0x7F, enabling full memory traversal in one transaction.
Device addressing uses a fixed 4-bit control code (1010b) plus three hardware-selectable chip address bits (A0–A2), allowing up to eight devices on one bus. The SOT-23-6 package variant omits A2, limiting cascading to four devices and restricting address bit A10 usage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1 Kbit (128 × 8-bit organization), sufficient for small configuration storage or calibration constants |
| Interface | I²C-compatible 2-wire serial bus, compatible with standard microcontroller I²C peripherals without protocol translation |
| Write speed | Page write time ≤1 ms; enables rapid firmware parameter updates without blocking host CPU for extended periods |
| Endurance | ≥1,000,000 erase/write cycles, suitable for logging or counter applications with frequent updates |
| Data retention | ≥200 years at +85°C, ensuring long-term reliability in unattended industrial equipment |
| Supply voltage | 4.5V to 5.5V only - not 2.5V or 3.3V compatible; requires stable 5V rail or level-shifting for mixed-voltage systems |
| Operating temp | –40°C to +85°C (Industrial grade), validated for use in factory automation, HVAC controls, and power supply monitoring |
Pinout & Package
24C01CT-I/OT is supplied in Pb-free, RoHS-compliant SOT-23-6 package (6-lead, 1.6 mm × 2.8 mm body, 0.95 mm pitch). Pin 1 is laser-marked; exposed pad absent.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Must be 4.5–5.5V; internal VCC threshold detector disables writes below ~3.8V to prevent corruption |
| SCL | Serial clock input | Master-generated clock; Schmitt-trigger input ensures reliable edge detection on noisy PCB traces |
| SDA | Serial data bidirectional | Open-drain output requiring external pull-up (2 kΩ for 400 kHz); changes only during SCL low except for Start/Stop |
| VSS | Ground reference | Return path for all internal logic and I/O; must be low-impedance connection to minimize ground bounce |
| A0 | Chip select bit 0 | Hardwired high/low to configure slave address; enables up to four devices on same bus in SOT-23 package |
| A1 | Chip select bit 1 | Second address bit; combined with A0, defines unique I²C address within 4-device limit for this package |
Key Features
| Feature | Design Value |
|---|---|
| 16-byte page write buffer | Reduces I²C transaction count by up to 16× vs. byte writes, lowering bus occupancy and host CPU overhead |
| Schmitt-trigger inputs (SCL/SDA) | Provides ≥50 mV hysteresis (0.05 × VCC), rejecting noise spikes up to 50 ns duration without external filtering |
| Output slope control | Slows SDA fall time to eliminate ground bounce-induced glitches during high-current switching events |
| Self-timed erase/write cycle | Eliminates need for external timing circuitry or polling delay loops; host can issue ACK polling to detect completion |
| ESD protection | ≥4000 V HBM on all pins, enabling safe handling and operation in electrostatic-prone assembly environments |
Applications
| Smart Sensor Calibration | Industrial PLC Configuration |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in environmental monitoring nodes. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during power-up initialization via I²C; no timing-critical access required. Use Value: Enables field-replaceable sensors without recalibration; leverages 200-year retention to avoid drift-related recalibration over product lifetime. |
Use Scenario: Holding user-defined I/O mapping, alarm thresholds, and communication parameters in modular programmable logic controllers. IC Role / Device Role / Timing Role: Persistent settings storage updated infrequently but read at every boot; operates as I²C slave under ARM Cortex-M host control. Use Value: Supports hot-swappable I/O modules with independent configuration; page write capability allows atomic update of multi-parameter sets. |
| Power Supply Sequencing | Medical Device Usage Log |
Use Scenario: Storing startup delay values and voltage ramp rates for multi-rail DC/DC converters in telecom infrastructure equipment. IC Role / Device Role / Timing Role: Configuration EEPROM interfaced to PMIC controller; accessed during pre-power-on initialization sequence. Use Value: Allows OEM-specific sequencing profiles without firmware reflash; 1 ms write time enables dynamic profile updates during maintenance mode. |
Use Scenario: Recording cumulative operational hours, error codes, and calibration history in portable diagnostic instruments. IC Role / Device Role / Timing Role: Wear-leveling–free nonvolatile log storage; writes occur only at session end or fault event, minimizing endurance wear. Use Value: Meets IEC 62304 traceability requirements; 1M-cycle endurance supports >10 years of daily logging at 300 entries/year. |
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, I²C, SOIC-8; supports 1 MHz clock (vs. 400 kHz max for 24C01CT-I/OT) | Wider voltage range enables direct use with 3.3V microcontrollers; SOIC-8 footprint incompatible with SOT-23-6 layout | Select when system uses 3.3V I/O and board space permits SOIC-8; not drop-in for SOT-23-6 designs |
| STK12C01-55I/M | 1 Kbit, 4.5–5.5V, NVSRAM with automatic store-on-power-loss; no I²C interface (uses parallel x8 bus) | Provides instant-write capability and unlimited write endurance; requires 8 data lines + address/control signals instead of 2-wire bus | Select when deterministic sub-μs write latency is critical and parallel interface is available; incompatible pinout and protocol |
Compared with AT24C01D-SSHM-T and STK12C01-55I/M, the 24C01CT-I/OT offers optimal fit for space-constrained 5V-only I²C systems requiring proven industrial-grade reliability, minimal BOM count, and zero layout change from legacy SOT-23-6 footprints.
Availability
24C01CT-I/OT is available at Aetrix Electronics and suitable for industrial PLC configuration, smart sensor calibration, and medical device usage logging requiring stable component supply across multi-year production cycles.
Supply support for 24C01CT-I/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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products, with global manufacturing and quality certifications.
The 24C01CT-I/OT belongs to Microchip's legacy 24Cxx serial EEPROM family, designed for cost-sensitive, low-power, space-constrained embedded systems requiring simple, robust nonvolatile storage without complex firmware drivers.
FAQ
What is the maximum I²C clock frequency supported by the 24C01CT-I/OT?
The 24C01CT-I/OT supports up to 400 kHz I²C clock frequency under industrial temperature conditions. At 25°C, it may operate reliably at higher frequencies, but 400 kHz is the guaranteed maximum per datasheet AC specifications. Exceeding this limit risks timing violations in setup/hold windows, especially with capacitive bus loads above 400 pF.
Does the 24C01CT-I/OT require an external pull-up resistor on the SDA line?
Yes, the 24C01CT-I/OT requires an external pull-up resistor on the SDA line because its SDA pin is open-drain. A 2 kΩ resistor to VCC is recommended for 400 kHz operation; 10 kΩ is sufficient for 100 kHz. Without this resistor, the SDA line cannot achieve valid high-level logic states, preventing proper I²C communication.
Can the 24C01CT-I/OT be used in a 3.3V system?
No, the 24C01CT-I/OT is specified only for 4.5V to 5.5V operation. Using it with 3.3V violates absolute maximum ratings and will result in unreliable read/write behavior or complete failure. For 3.3V systems, consider Microchip's AT24C01D or similar 1.7–5.5V EEPROMs with compatible pinout and protocol.
How many 24C01CT-I/OT devices can be connected on the same I²C bus?
Up to four 24C01CT-I/OT devices can share one I²C bus when using the SOT-23-6 package, because A2 is not bonded out. Address selection relies solely on A0 and A1, yielding four unique combinations (00, 01, 10, 11). This differs from 8-pin packages which support eight devices via A0–A2.
What happens if a page write crosses a 16-byte boundary on the 24C01CT-I/OT?
If a page write command attempts to cross a 16-byte boundary, the address counter wraps within the current page - data beyond the boundary overwrites earlier bytes in that same page instead of advancing to the next page. This behavior is documented in the datasheet and requires firmware to split writes at page boundaries to avoid unintended data loss.
24C01CT-I/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:
- 400 kHz
- Write Cycle Time - Word, Page:
- 1ms
- Access Time:
- 900 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
24C01CT-I/OT FAQ
1.How can I place an order for 24C01CT-I/OT through Aetrix?
Please submit a Request for Quotation (RFQ) for 24C01CT-I/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-I/OT reliable?
The price and inventory of 24C01CT-I/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-I/OT is usually 5 days.
3.What payment methods are accepted for 24C01CT-I/OT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 24C01CT-I/OT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 24C01CT-I/OT?
24C01CT-I/OT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 24C01CT-I/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-I/OT?
For technical support, including 24C01CT-I/OT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 24C01CT-I/OT requirements.
6.How does Aetrix verify that 24C01CT-I/OT is sourced from the original manufacturer or authorized distributors?
All 24C01CT-I/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-I/OT meets industry standards.
7.What is the process for return or replacement of 24C01CT-I/OT?
All 24C01CT-I/OT units undergo pre-shipment inspection (PSI). If there is an issue with 24C01CT-I/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-I/OT part is unused and in its original packaging.
Return procedure for 24C01CT-I/OT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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