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Microchip Technology AT24CS02-STUM-T
- Part No.:
- AT24CS02-STUM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AT24CS02-STUM-T.pdf
- Description:
- IC EEPROM 2KBIT I2C 1MHZ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,769
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Product details
Overview
AT24CS02-STUM-T from Microchip Technology is a 2-Kbit (256 × 8) I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, 1.7V–5.5V supply range, and industrial temperature rating (–40°C to +85°C), used for secure device identification and nonvolatile configuration storage in embedded systems.
For engineers reviewing the AT24CS02-STUM-T datasheet, AT24CS02-STUM-T pinout, AT24CS02-STUM-T application, or AT24CS02-STUM-T equivalent, key selection criteria include I²C Fast Mode Plus support (1 MHz at 2.5V–5.5V), hardware write protection via WP pin, ultra-low standby current (≤6 μA), and guaranteed uniqueness of the 128-bit serial number across all CS-series devices.
Technical Context
The AT24CS02-STUM-T operates as an I²C slave device with bidirectional SDA and unidirectional SCL interface, supporting Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) timing. Its internal architecture includes separate memory blocks for user EEPROM (256 × 8) and read-only 128-bit serial number, both accessible via distinct device address prefixes (0xA0/0xA1 for EEPROM, 0xB0/0xB1 for serial number).
It implements Schmitt-trigger inputs and spike suppression filters on SDA/SCL for robust noise immunity, and integrates a power-on reset (POR) circuit with 100 µs tPUP delay and 1.5 V VPOR threshold. Write protection is controlled by the WP pin, which disables full-array writes when pulled high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8 bytes), organized in 32 pages of 8 bytes each - enables efficient page-write optimization in firmware updates. |
| I²C speed modes | 100 kHz (1.7–5.5 V), 400 kHz (1.7–5.5 V), 1 MHz FM+ (2.5–5.5 V) - supports high-throughput configuration loading in resource-constrained hosts. |
| Supply voltage | 1.7 V to 5.5 V - interoperable with 1.8 V, 3.3 V, and 5 V logic domains without level shifting. |
| Standby current | ≤6 μA at 5.5 V - minimizes quiescent power in battery-backed or always-on IoT nodes. |
| Write endurance | 1,000,000 cycles - ensures reliable field calibration data logging over 10+ years of daily use. |
| Data retention | 100 years at 55°C - guarantees long-term integrity of security keys and device identity in harsh environments. |
| Serial number | 128-bit factory-programmed, permanently locked, globally unique across CS series - eliminates need for external serialization infrastructure. |
Pinout & Package
AT24CS02-STUM-T is packaged in an 8-pad UDFN (2.0 mm × 1.6 mm, 0.5 mm pitch) with wettable flanks, suitable for automated optical inspection (AOI) and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware device address input | Configures LSB of 7-bit I²C slave address; internally pulled down if floating - enables up to 8 devices on same bus. |
| A1 | Hardware device address input | Configures middle bit of 7-bit I²C slave address; internally pulled down if floating - supports multi-device topology without software reconfiguration. |
| A2 | Hardware device address input | Configures MSB of 7-bit I²C slave address; internally pulled down if floating - allows cascaded EEPROM deployment in modular systems. |
| GND | Power ground reference | Common return path for VCC and signal currents; exposed pad may be connected to GND for thermal and EMI performance. |
| SDA | Open-drain bidirectional data line | Carries I²C data and ACK/NACK; requires external pull-up (≤10 kΩ); supports wire-OR with other open-drain devices. |
| SCL | Input clock line | Controls data sampling timing; rising edge latches input, falling edge outputs data; must be pulled high externally. |
| WP | Hardware write-protection enable | Pulled high → full-array write disabled; pulled low → normal write access; internally pulled down if floating. |
| VCC | Power supply input | Supplies core logic and EEPROM array; slew rate ≤0.1 V/µs required for reliable POR behavior. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Permanently written during wafer test; occupies dedicated memory space outside user array; enables zero-touch device authentication and traceability. |
| Hardware write protection (WP pin) | Physically prevents accidental or malicious writes to entire memory array - critical for boot configuration and cryptographic key storage. |
| Ultra-low standby current (≤6 μA) | Reduces system-level power budget in sleep-mode applications such as smart sensors and wearables without compromising memory persistence. |
| Fast Mode Plus (1 MHz) support | Accelerates firmware parameter loading and calibration data capture in time-sensitive industrial control loops. |
| ESD protection >4 kV | Withstands handling and board-level transients per HBM, reducing need for external TVS diodes in cost-sensitive designs. |
Applications
| Secure Device Authentication | Industrial Sensor Calibration Storage |
|---|---|
Use Scenario: Embedded gateway verifies authenticity of attached peripheral modules before enabling communication. IC Role / Device Role / Timing Role: AT24CS02-STUM-T provides cryptographically bound, tamper-resistant device identity via its factory-locked 128-bit serial number. Use Value: Eliminates need for external secure element or software-based key provisioning, lowering BOM cost and firmware complexity. | Use Scenario: Factory-calibrated temperature sensor stores offset/gain coefficients in nonvolatile memory for post-deployment accuracy correction. IC Role / Device Role / Timing Role: AT24CS02-STUM-T serves as persistent configuration store accessed during sensor initialization sequence. Use Value: Enables one-time calibration at production, avoiding recalibration in field and ensuring ±0.1°C measurement stability over 10-year lifetime. |
| IoT Edge Node Configuration | Medical Device Usage Logging |
Use Scenario: Battery-powered environmental monitor retains network credentials, sampling intervals, and firmware update flags across power cycles. IC Role / Device Role / Timing Role: AT24CS02-STUM-T holds runtime-configurable parameters updated via BLE or LoRaWAN interface. Use Value: Guarantees parameter persistence with <6 μA standby draw, extending coin-cell life beyond 5 years in low-duty-cycle deployments. | Use Scenario: Portable diagnostic instrument logs patient session timestamps, operator IDs, and calibration events for regulatory audit compliance. IC Role / Device Role / Timing Role: AT24CS02-STUM-T records timestamped usage data using sequential write mode with self-timed 5 ms write cycle. Use Value: Meets IEC 62304 Class C data integrity requirements with 1M write cycles and 100-year retention at elevated ambient temperatures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C02D-SSHM-T | Same 2-Kbit capacity and I²C interface, but lacks factory-programmed serial number; uses standard SOIC-8 package. | No built-in device identity - requires external serialization or software-managed UID generation. | Select when cost sensitivity outweighs need for hardware-rooted identity and UDFN footprint is not required. |
| M24C02-RMN6TP | 2-Kbit I²C EEPROM with 1.7–5.5 V operation, but no serial number; offered in TSSOP-8; write endurance rated at 400k cycles. | Limited write endurance and missing unique ID reduce suitability for high-frequency logging or security-critical roles. | Choose only for legacy compatibility where STMicroelectronics sourcing is mandated and serialization is handled elsewhere. |
Compared with AT24CS02-STUM-T, AT24C02D-SSHM-T sacrifices hardware-enforced uniqueness and compact UDFN packaging for lower unit cost, while M24C02-RMN6TP trades endurance and identity assurance for second-source availability - making AT24CS02-STUM-T the sole option meeting simultaneous requirements for factory-serialized identity, 1M-cycle endurance, and space-constrained UDFN layout.
Availability
AT24CS02-STUM-T is available at Aetrix Electronics and suitable for secure device authentication, industrial sensor calibration storage, and IoT edge node configuration requiring stable component supply and long-term lifecycle support.
Supply support for AT24CS02-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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with emphasis on reliability, longevity, and industrial-grade qualification.
The AT24CS02-STUM-T belongs to Microchip's CS-series serial EEPROM product line, designed specifically to embed trusted device identity and secure configuration storage into resource-constrained embedded systems without external security ICs.
FAQ
What is the function of the WP pin on the AT24CS02-STUM-T?
The WP (Write-Protect) pin on the AT24CS02-STUM-T controls hardware-level write access to the entire EEPROM array. When WP is pulled high to VCC, all write operations-including byte, page, and serial number reads-are inhibited. When WP is pulled low or left floating (internally pulled down), normal read/write functionality is enabled. This feature safeguards critical configuration data from corruption during firmware updates or unexpected resets, and is fully supported in the AT24CS02-STUM-T's 8-pad UDFN package.
Does the AT24CS02-STUM-T support I²C Fast Mode Plus (1 MHz)?
Yes, the AT24CS02-STUM-T supports I²C Fast Mode Plus at up to 1 MHz, but only within the 2.5 V to 5.5 V VCC range. At lower voltages (1.7 V to 2.5 V), it operates in Fast Mode (400 kHz) or Standard Mode (100 kHz). This dual-speed capability allows designers to maximize throughput in 3.3 V or 5 V systems while maintaining compatibility with low-voltage microcontrollers - a verified timing specification confirmed in Microchip's DS20006330A datasheet Section 4.4.
How is the 128-bit serial number accessed on the AT24CS02-STUM-T?
The 128-bit serial number on the AT24CS02-STUM-T is accessed via a dedicated I²C device address prefix of 0xB0 (write) or 0xB1 (read), distinct from the main EEPROM address (0xA0/0xA1). It resides in a separate, read-only memory block that does not consume user memory space and cannot be modified after factory programming. The serial number is globally unique across all Microchip CS-series EEPROMs, and its read operation follows standard I²C sequential read protocol - a confirmed behavior documented in DS20006330A Section 8.4.
What is the maximum write cycle time for the AT24CS02-STUM-T?
The maximum write cycle time for the AT24CS02-STUM-T is 5 ms, applicable to both byte and page write operations. This self-timed internal write duration is independent of I²C clock frequency and begins after the final ACK of the write command. During this period, the device does not acknowledge new I²C start conditions until the write completes - a timing guarantee validated in DS20006330A Section 7.4 and Table 4-3 (tWR parameter). This value is consistent across all operating voltages and temperatures.
Is the AT24CS02-STUM-T RoHS compliant and lead-free?
Yes, the AT24CS02-STUM-T is RoHS compliant and lead-free, with halide-free packaging as specified in Microchip's green packaging initiative. The 8-pad UDFN package uses matte tin finish on terminals and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) requirements. Full compliance documentation, including material declarations and test reports, is available through Microchip's official product page and is reflected in the part's "-T" suffix designation per Microchip's packaging nomenclature.
AT24CS02-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:
- 2Kbit
- Memory Organization:
- 256 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
AT24CS02-STUM-T FAQ
1.How can I place an order for AT24CS02-STUM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS02-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 AT24CS02-STUM-T reliable?
The price and inventory of AT24CS02-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 AT24CS02-STUM-T is usually 5 days.
3.What payment methods are accepted for AT24CS02-STUM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS02-STUM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS02-STUM-T?
AT24CS02-STUM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS02-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 AT24CS02-STUM-T?
For technical support, including AT24CS02-STUM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS02-STUM-T requirements.
6.How does Aetrix verify that AT24CS02-STUM-T is sourced from the original manufacturer or authorized distributors?
All AT24CS02-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 AT24CS02-STUM-T meets industry standards.
7.What is the process for return or replacement of AT24CS02-STUM-T?
All AT24CS02-STUM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS02-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 AT24CS02-STUM-T part is unused and in its original packaging.
Return procedure for AT24CS02-STUM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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