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Microchip Technology AT24CS01-STUM-T
- Part No.:
- AT24CS01-STUM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AT24CS01-STUM-T.pdf
- Description:
- IC EEPROM 1KBIT I2C 1MHZ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:15,070
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Product details
Overview
AT24CS01-STUM-T from Microchip Technology is a 1-Kbit I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, organized as 128 × 8 bits, operating from 1.7V to 5.5V, and rated for -40°C to +85°C industrial temperature range. It supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) I²C protocols and features hardware write protection via WP pin.
For engineers reviewing the AT24CS01-STUM-T datasheet, AT24CS01-STUM-T pinout, AT24CS01-STUM-T application, or AT24CS01-STUM-T equivalent, key selection considerations include its guaranteed-unique serial number, ultra-low standby current (≤6 μA), 1-Mcycle endurance, 100-year data retention, and compatibility with space-constrained UDFN-8 packaging.
Technical Context
The AT24CS01-STUM-T implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and open-drain bidirectional data transfer. Its internal architecture includes a dedicated 128-bit read-only serial number block-physically separate from user memory and permanently locked during wafer fabrication.
It uses an on-chip high-voltage generation circuit for EEPROM programming, supports 8-byte page writes with partial-page capability, and incorporates Power-on Reset (POR) with 100 µs tPUP delay. Write protection is enforced by direct WP pin logic: tied to VCC disables all writes; tied to GND enables full-array access.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 1,024 bits (128 × 8), nonvolatile EEPROM storage |
| Supply voltage | 1.7V–5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifters |
| I²C speed modes | 100 kHz (Std), 400 kHz (Fast), 1 MHz (FM+) - supports scalable bus timing across legacy and high-speed designs |
| Standby current | ≤6 μA at 5.5V - critical for battery-powered IoT nodes and energy-harvesting systems |
| Write endurance | 1,000,000 cycles - ensures long-term reliability in firmware update logging or calibration storage |
| Data retention | 100 years at 55°C - guarantees archival integrity for medical, industrial, and automotive deployments |
| Serial number | 128-bit factory-programmed, permanent, globally unique - eliminates need for external serialization in device identity management |
Pinout & Package
AT24CS01-STUM-T is supplied in an 8-pad UDFN package (2.0 mm × 1.6 mm, 0.5 mm pitch) with wettable flank leads for automated optical inspection. The exposed pad is optional and may be connected to GND or left floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware address input | Configures LSB of 7-bit I²C slave address; pulled down internally if unconnected |
| A1 | Hardware address input | Configures middle bit of 7-bit I²C slave address; enables up to eight devices on one bus |
| A2 | Hardware address input | Configures MSB of 7-bit I²C slave address; required for multi-device addressing |
| GND | Ground reference | System return path for VCC and signal logic; must be low-impedance |
| SDA | Serial data I/O | Open-drain bidirectional line; requires external pull-up resistor ≤10 kΩ |
| SCL | Serial clock input | Master-generated clock; rising edge latches input, falling edge outputs data |
| WP | Write-protect control | Hardwired to VCC to lock entire memory array; pulled down internally if floating |
| VCC | Power supply | 1.7V–5.5V source; must ramp monotonically at ≤0.1 V/µs for reliable POR |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Immutable, globally unique identifier stored in dedicated ROM block - removes production-line serialization overhead |
| Three I²C speed modes | Backward-compatible 100/400 kHz plus 1 MHz FM+ support - future-proofs design against bus bandwidth upgrades |
| Hardware write protection | Pin-level WP logic prevents accidental overwrites without software intervention - enhances field reliability |
| Ultra-low power operation | 3 mA max active current and 6 μA max standby current - extends battery life in portable and sensor-edge applications |
| Noise-immune interface | Schmitt triggers + input filtering on SDA/SCL - maintains robust communication in electrically noisy industrial environments |
Applications
| Asset Tracking Tag | Medical Sensor Calibration |
|---|---|
Use Scenario: Small-form-factor BLE tag embedded in logistics pallets or reusable containers. IC Role / Device Role / Timing Role: Nonvolatile storage for unique device ID, firmware version, and last-scan timestamp. Use Value: Factory-programmed 128-bit serial number enables zero-touch provisioning and cryptographic binding without host-side ID generation. | Use Scenario: Disposable wearable patch measuring ECG or temperature over 72-hour clinical trial. IC Role / Device Role / Timing Role: Stores calibrated offset/gain coefficients and patient-specific configuration at time of manufacture. Use Value: 100-year data retention and 1M-cycle endurance ensure calibration persistence across device lifetime and repeated reprogramming. |
| Industrial PLC Module | Smart Home Hub |
Use Scenario: DIN-rail mounted controller with field-replaceable I/O expansion cards. IC Role / Device Role / Timing Role: Holds card type, revision, and calibration data; accessed during hot-plug enumeration. Use Value: Hardware WP pin prevents runtime corruption during firmware updates or brownout events in harsh factory environments. | Use Scenario: Central hub managing Zigbee/Z-Wave peripherals and local automation rules. IC Role / Device Role / Timing Role: Stores network credentials, pairing history, and user-defined scene configurations. Use Value: 1.7V operation allows direct connection to Li-ion battery backup rail (2.5–3.6V), eliminating LDO overhead. |
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 | Same 1-Kbit density and SOIC-8 package, but lacks factory-programmed serial number and FM+ support | Requires external serialization for device identity; limited to 400 kHz max I²C speed | Select when unique ID and 1 MHz timing are unnecessary and SOIC-8 footprint is preferred |
| M24C01-RMN6TP | 1-Kbit EEPROM with 1.7–5.5V range and 400 kHz I²C, but no serial number and only industrial temp grade (-40°C to +85°C) | No built-in identity feature; lower endurance (400k cycles) and shorter data retention (40 years) | Choose for cost-sensitive consumer applications where serialization is handled in MCU firmware |
Compared with AT24CS01-STUM-T, AT24C01D-SSHM-T omits the 128-bit serial number and FM+ mode, while M24C01-RMN6TP provides no hardware-based identity and offers reduced endurance and retention - making AT24CS01-STUM-T the only option delivering guaranteed uniqueness, 1-Mcycle endurance, and 1 MHz I²C in UDFN-8.
Availability
AT24CS01-STUM-T is available at Aetrix Electronics and suitable for asset tracking tags, medical sensor calibration modules, industrial PLC I/O cards, smart home hubs, and secure firmware update loggers requiring stable component supply and long-term lifecycle assurance.
Supply support for AT24CS01-STUM-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 leading provider of microcontrollers, analog, FPGA, and memory solutions, serving industrial, automotive, communications, and consumer markets with vertically integrated silicon and development tools.
The AT24CS01-STUM-T belongs to Microchip's CS-series Serial EEPROM product line, designed specifically to simplify device identity management and reduce manufacturing complexity through factory-programmed, globally unique serial numbers.
FAQ
What is the function of the WP pin on the AT24CS01-STUM-T?
The WP (Write-Protect) pin on the AT24CS01-STUM-T controls hardware-level memory write access. When tied to VCC, it disables all write operations to the entire EEPROM array; when tied to GND, normal read/write functionality is enabled. If left floating, the pin is internally pulled down to GND, enabling writes - though Microchip recommends hardwiring WP to a known state for reliability. This feature ensures immunity to accidental overwrites during power transients or software faults in the AT24CS01-STUM-T.
Does the AT24CS01-STUM-T support 1 MHz I²C communication?
Yes, the AT24CS01-STUM-T supports Fast Mode Plus (FM+) I²C operation at up to 1 MHz, but only when VCC is between 2.5V and 5.5V. At lower supply voltages (1.7V–2.5V), it operates in standard Fast Mode up to 400 kHz. This dual-speed capability allows system designers to maximize bus throughput in higher-voltage domains while maintaining compatibility with 1.8V logic interfaces using the 400 kHz mode. The AT24CS01-STUM-T meets all AC timing requirements for FM+ per its datasheet DS20006330A.
How is the 128-bit serial number accessed on the AT24CS01-STUM-T?
The 128-bit serial number on the AT24CS01-STUM-T is accessed via a dedicated I²C device address: the standard 7-bit slave address uses '1010' (0xA) as the device type identifier, whereas the serial number block uses '1011' (0xB). After sending a Start condition and this alternate address byte, the master reads 16 consecutive bytes (128 bits) sequentially. The serial number is read-only, factory-programmed, and resides in a physically separate memory region that does not consume user EEPROM space. This behavior is fully defined for the AT24CS01-STUM-T in Section 8.4 of DS20006330A.
What package type is used by the AT24CS01-STUM-T?
The AT24CS01-STUM-T is packaged in an 8-pad UDFN (Ultra Thin Dual Flat No-lead) package measuring 2.0 mm × 1.6 mm with 0.5 mm pitch and wettable flank leads. This compact, lead-free, RoHS-compliant package supports automated optical inspection and is optimized for space-constrained PCB layouts in wearables, sensors, and miniaturized IoT endpoints. The exposed thermal pad is optional and may be connected to GND or left floating - a key mechanical distinction from SOIC or TSSOP variants of the AT24CS01 family.
What is the maximum write cycle time for the AT24CS01-STUM-T?
The maximum self-timed write cycle time for the AT24CS01-STUM-T is 5 ms, applicable to both byte and page write operations. This value is guaranteed across the full operating voltage (1.7V–5.5V) and temperature (-40°C to +85°C) ranges. During this period, the device does not acknowledge I²C commands until the internal programming sequence completes - a behavior managed via acknowledge polling. This fixed 5 ms latency directly impacts firmware design for time-critical logging or configuration updates using the AT24CS01-STUM-T.
AT24CS01-STUM-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:
- 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:
- 550 ns
- Voltage - Supply:
- 1.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
AT24CS01-STUM-T FAQ
1.How can I place an order for AT24CS01-STUM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS01-STUM-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 AT24CS01-STUM-T reliable?
The price and inventory of AT24CS01-STUM-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24CS01-STUM-T is usually 5 days.
3.What payment methods are accepted for AT24CS01-STUM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS01-STUM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS01-STUM-T?
AT24CS01-STUM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS01-STUM-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 AT24CS01-STUM-T?
For technical support, including AT24CS01-STUM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS01-STUM-T requirements.
6.How does Aetrix verify that AT24CS01-STUM-T is sourced from the original manufacturer or authorized distributors?
All AT24CS01-STUM-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 AT24CS01-STUM-T meets industry standards.
7.What is the process for return or replacement of AT24CS01-STUM-T?
All AT24CS01-STUM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS01-STUM-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 AT24CS01-STUM-T part is unused and in its original packaging.
Return procedure for AT24CS01-STUM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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