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Microchip Technology AT24C01B-TSU-T
- Part No.:
- AT24C01B-TSU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AT24C01B-TSU-T.pdf
- Description:
- IC EEPROM 1KBIT I2C 1MHZ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,225
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Product details
Overview
AT24C01B-TSU-T from Microchip Technology is a 1K-bit (128 × 8) two-wire serial EEPROM operating from 1.8V to 5.5V, featuring hardware write protection via WP pin, 400 kHz I²C interface at 1.8V/2.5V/2.7V, and 1 MHz at 5V. It supports partial page writes, has 1 million write cycles endurance, and is packaged in a 5-lead SOT23 for space-constrained industrial sensor nodes and embedded control modules.
For engineers reviewing the AT24C01B-TSU-T datasheet, AT24C01B-TSU-T pinout, AT24C01B-TSU-T application, or AT24C01B-TSU-T equivalent, key selection factors include its 5-lead SOT23 footprint, 1.8V–5.5V supply range, WP-enabled hardware data protection, 400 kHz/1 MHz I²C timing compliance, and guaranteed 100-year data retention under industrial temperature conditions.
Technical Context
The AT24C01B-TSU-T implements a standard I²C-compatible two-wire interface with Schmitt-triggered, noise-filtered SCL and SDA inputs. Its internal address decoder uses A0–A2 pins to support up to eight devices on the same bus, and the WP pin directly disables write operations when held high.
It features an 8-byte page write buffer, self-timed internal write cycle (≤5 ms), and EEPROM array organized as 128 words of 8 bits each. The device operates across –40°C to +85°C and meets JEDEC JESD22-A117 reliability standards for data retention and endurance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1024 bits (128 × 8), enabling storage of calibration data, device IDs, or small configuration tables in resource-limited systems |
| Supply Voltage Range | 1.8V to 5.5V - supports direct interfacing with 1.8V logic, 3.3V microcontrollers, and legacy 5V systems without level shifting |
| I²C Clock Frequency | 400 kHz (1.8V/2.5V/2.7V), 1 MHz (5V) - ensures compatibility with standard and fast-mode I²C controllers |
| Write Endurance | 1 million write cycles - suitable for applications requiring frequent parameter updates, such as power metering or sensor recalibration |
| Data Retention | 100 years at +25°C - guarantees long-term nonvolatile storage integrity in unpowered industrial equipment |
| Package | 5-lead SOT23 (5TS1) - 2.9 mm × 1.6 mm footprint ideal for compact PCB layouts in wearables and IoT edge nodes |
| Write Protect | Hardware WP pin - provides deterministic, glitch-immune write inhibition independent of firmware state |
Pinout & Package
AT24C01B-TSU-T is supplied in a 5-lead SOT23 package (ordering code 5TS1), with pin 1 marked by a dot or bevelled edge. Pinout follows standard SOT23 orientation: top view, left-to-right, pin 1–3 on bottom row, pin 4–5 on top row.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 1.8V–5.5V; decoupling capacitor required near pin for stable I²C communication |
| WP | Write protect control | Active-high; ties to VCC to disable all writes, or to GND to enable full read/write access |
| SCL | Serial clock input | Drives bidirectional clock signal; requires external pull-up resistor (typically 2.2–10 kΩ) |
| SDA | Serial data I/O | Bidirectional open-drain node; shares pull-up with SCL; supports multi-master arbitration |
| GND | Ground reference | Must be connected to system common ground; low-impedance path critical for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functional down to 1.8V VCC - enables direct integration with ultra-low-power MCUs like PIC16LF or ARM Cortex-M0+ |
| Schmitt-trigger inputs | Enhanced noise immunity on SCL/SDA - eliminates false clock/data transitions in electrically noisy industrial environments |
| Partial page write capability | Allows writing 1–8 bytes per transaction - reduces bus occupancy and improves real-time responsiveness in time-critical systems |
| Self-timed write cycle | Max 5 ms internal erase/write completion - removes need for software polling or fixed delay loops |
| Lead-free/halogen-free | Complies with RoHS Directive 2011/65/EU and JEDEC JS709C - supports green manufacturing and export compliance |
Applications
| Industrial Sensor Calibration | Smart Meter Configuration Storage |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients and temperature compensation tables for analog sensor front-ends. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during power-on initialization via I²C. Use Value: Enables field-replaceable sensors with unique calibration data retained across 100+ years without battery backup. | Use Scenario: Holding tariff schedules, billing counters, and utility-specific communication parameters in electricity/water meters. IC Role / Device Role / Timing Role: Secure, WP-protected storage for mission-critical operational data updated infrequently but read continuously. Use Value: Hardware write protection prevents accidental or malicious overwrites during firmware updates or EMI events. |
| IoT Edge Node Device ID | Embedded Controller Boot Parameters |
Use Scenario: Storing unique MAC addresses, cryptographic keys, and device serial numbers in battery-powered wireless nodes. IC Role / Device Role / Timing Role: Persistent identity register accessed early in boot sequence before secure element initialization. Use Value: 5-lead SOT23 footprint minimizes board area while supporting secure provisioning workflows with minimal BOM impact. | Use Scenario: Saving last-known operational state (e.g., fan speed, voltage setpoint) after unexpected power loss in HVAC controllers. IC Role / Device Role / Timing Role: Fast-access nonvolatile scratchpad used during graceful shutdown and cold-start recovery routines. Use Value: 1 million write cycles allow daily state saves for >2700 years - exceeding product lifecycle requirements for industrial control hardware. |
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-bit capacity, 1.7–5.5V range, but rated only to +105°C (vs. +85°C for AT24C01B-TSU-T); no WP pin in this variant | Lacks hardware write protection - requires firmware-based lock mechanisms for secure parameter storage | Select when extended temperature operation is required and WP functionality is managed in software |
| ON Semiconductor CAT24C01HU4IGT3 | Identical 5-lead SOT23 package and 1.8–5.5V range; supports 1 MHz I²C at 2.5V (AT24C01B-TSU-T requires ≥4.5V for 1 MHz) | Enables faster I²C throughput in 2.5V systems where AT24C01B-TSU-T would be limited to 400 kHz | Select when 1 MHz I²C operation at 2.5V is mandatory and pinout compatibility is required |
Compared with M24C01-RMN6TP and CAT24C01HU4IGT3, the AT24C01B-TSU-T uniquely combines hardware WP, 1.8V–5.5V operation, and verified 100-year data retention - making it optimal for safety-critical or tamper-resistant embedded designs where firmware-level protection is insufficient.
Availability
AT24C01B-TSU-T is available at Aetrix Electronics and suitable for industrial sensor calibration, smart meter configuration storage, and IoT edge node device ID management requiring stable component supply across multi-year production cycles.
Supply support for AT24C01B-TSU-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.
The AT24C01B series belongs to Microchip's serial EEPROM product line, designed specifically for reliable, low-power, and cost-effective nonvolatile data storage in space- and power-constrained embedded systems.
FAQ
What is the operating temperature range for the AT24C01B-TSU-T?
The AT24C01B-TSU-T is specified for industrial temperature operation from –40°C to +85°C. This range is validated per Microchip's qualification testing and applies to all electrical specifications in the datasheet, including I²C timing, write endurance, and data retention. The AT24C01B-TSU-T does not support extended temperature grades beyond this range.
Does the AT24C01B-TSU-T support I²C fast mode plus (1 MHz) at 1.8V?
No, the AT24C01B-TSU-T supports 1 MHz I²C only at VCC ≥ 4.5V. At 1.8V, 2.5V, and 2.7V, maximum clock frequency is 400 kHz. This limitation is defined in Table 2-3 of the official datasheet and reflects internal timing constraints of the charge pump and logic circuitry within the AT24C01B-TSU-T die.
How many devices can share the same I²C bus with the AT24C01B-TSU-T?
Up to eight AT24C01B-TSU-T devices can be addressed on a single I²C bus using the A0, A1, and A2 address input pins. Each combination of these three pins sets a unique 3-bit device address prefix, allowing distinct addressing without bus contention. All AT24C01B-TSU-T units must share the same VCC and GND references for proper operation.
Is the AT24C01B-TSU-T pin-compatible with other AT24C01x variants in SOT23 packages?
Yes - the AT24C01B-TSU-T uses the standard 5-lead SOT23 pinout (VCC, WP, SCL, SDA, GND) shared across all Microchip AT24C01x SOT23 variants, including AT24C01D-TSU-T. This allows drop-in replacement within the same package family, provided voltage and timing requirements align with the target application.
What is the maximum capacitive load the AT24C01B-TSU-T SDA and SCL pins can drive?
The AT24C01B-TSU-T SDA and SCL pins are designed to operate with a total bus capacitance ≤ 400 pF, as specified in I²C-bus standard UM10204. Input capacitance is characterized at 8 pF (SDA) and 6 pF (SCL, A0–A2), but actual bus loading depends on PCB trace length, connector parasitics, and number of attached devices - all must be included in the 400 pF limit for reliable AT24C01B-TSU-T communication.
AT24C01B-TSU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- 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:
- 550 ns
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AT24C01B-TSU-T FAQ
1.How can I place an order for AT24C01B-TSU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24C01B-TSU-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 AT24C01B-TSU-T reliable?
The price and inventory of AT24C01B-TSU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24C01B-TSU-T is usually 5 days.
3.What payment methods are accepted for AT24C01B-TSU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24C01B-TSU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24C01B-TSU-T?
AT24C01B-TSU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24C01B-TSU-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 AT24C01B-TSU-T?
For technical support, including AT24C01B-TSU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24C01B-TSU-T requirements.
6.How does Aetrix verify that AT24C01B-TSU-T is sourced from the original manufacturer or authorized distributors?
All AT24C01B-TSU-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 AT24C01B-TSU-T meets industry standards.
7.What is the process for return or replacement of AT24C01B-TSU-T?
All AT24C01B-TSU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24C01B-TSU-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 AT24C01B-TSU-T part is unused and in its original packaging.
Return procedure for AT24C01B-TSU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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