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Microchip Technology AT24CS02-XHM-B
- Part No.:
- AT24CS02-XHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24CS02-XHM-B.pdf
- Description:
- IC EEPROM 2KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,350
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Product details
Overview
AT24CS02-XHM-B 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-XHM-B datasheet, AT24CS02-XHM-B pinout, AT24CS02-XHM-B application, or AT24CS02-XHM-B equivalent, this page delivers verified electrical specs, package mapping, I²C timing compliance (100/400 kHz standard/fast mode, 1 MHz FM+ at ≥2.5V), write-protection behavior, and real-world use cases in asset tracking, calibration data storage, and firmware versioning.
Technical Context
The AT24CS02-XHM-B operates as an I²C slave device with hard-wired A0–A2 address inputs enabling up to eight devices on one bus; it supports bidirectional data transfer using open-drain SDA/SCL with Schmitt-triggered, noise-filtered inputs. Its internal architecture includes dedicated 128-bit read-only serial number memory separate from user EEPROM space.
It implements hardware write protection via the WP pin (GND = enabled, VCC = full-array lock), uses 8-byte page write mode with partial-page capability, and features self-timed write cycles ≤5 ms. Power management includes ultra-low standby current (≤6 μA at 5.5V) and active current ≤3 mA during write operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8), organized in 32 pages of 8 bytes each - enables compact firmware parameter storage without external memory controller |
| Supply voltage | 1.7V to 5.5V - supports direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifting |
| I²C speed modes | 100 kHz (std), 400 kHz (fast), 1 MHz (FM+, ≥2.5V) - ensures compatibility across legacy and high-speed embedded buses |
| Write endurance | 1,000,000 cycles - suitable for frequent calibration updates or runtime logging in industrial sensors |
| Data retention | 100 years at 55°C - guarantees long-term reliability in unattended equipment like smart meters or medical devices |
| Serial number | 128-bit factory-programmed, permanent, globally unique - eliminates need for external serialization in production line programming |
| ESD protection | >4,000V HBM - enhances robustness in handling-sensitive consumer and automotive assembly environments |
Pinout & Package
AT24CS02-XHM-B is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with standard 150-mil body width and gull-wing leads. This RoHS-compliant, green package supports reflow soldering and is compatible with automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware device address input | Hard-wired to GND or VCC to set LSB of 7-bit I²C slave address; enables multi-device bus addressing (up to 8 units) |
| A1 | Hardware device address input | Hard-wired to GND or VCC to set middle bit of 7-bit I²C slave address; part of cascaded addressing scheme |
| A2 | Hardware device address input | Hard-wired to GND or VCC to set MSB of 7-bit I²C slave address; determines unique bus position among same-family devices |
| GND | Power ground reference | System return path for VCC and all internal logic; must be low-impedance connection to avoid noise-induced communication errors |
| SDA | Serial data bidirectional I/O | Open-drain interface requiring external pull-up resistor (≤10 kΩ); shares bus with other I²C devices via wire-OR topology |
| SCL | Serial clock input | Master-generated clock controlling data sampling (rising edge) and output (falling edge); must be pulled high when idle |
| WP | Hardware write-protect control | Connected to VCC to lock entire memory array against accidental writes; internally pulled down if left floating |
| VCC | Device power supply | Primary voltage source (1.7–5.5V); powers internal high-voltage generation circuit for EEPROM write operations |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Permanently written during wafer test; occupies dedicated memory block outside user space and ensures uniqueness across all CS-series EEPROMs |
| Three I²C speed modes | Supports 100 kHz (1.7–5.5V), 400 kHz (1.7–5.5V), and 1 MHz FM+ (2.5–5.5V) - allows optimal timing selection based on system voltage and noise environment |
| Schmitt-triggered, filtered inputs | Reduces susceptibility to bus noise and EMI in electrically noisy industrial settings without requiring external RC filtering |
| 8-byte page write with partial capability | Enables efficient small-data updates (e.g., single register config) without erasing full page - minimizes write latency and wear leveling overhead |
| Ultra-low standby current | Max 6 μA at 5.5V - extends battery life in always-on IoT nodes and portable diagnostic tools where EEPROM remains powered continuously |
Applications
| Asset Tracking Tag | Medical Sensor Calibration |
|---|---|
Use Scenario: Embedded in reusable surgical instruments to store sterilization count, usage history, and manufacturing traceability data. IC Role / Device Role / Timing Role: Nonvolatile memory storing immutable device identity (via 128-bit serial number) and field-updatable operational parameters. Use Value: Eliminates manual barcode scanning by enabling automatic instrument ID readout over I²C during docking; supports FDA UDI compliance with tamper-proof serial data. | Use Scenario: Mounted on patient-worn biosensors to retain factory-calibrated gain/offset coefficients and sensor-specific compensation tables. IC Role / Device Role / Timing Role: Secure configuration storage with hardware write-protection (WP pin tied to VCC) preventing runtime corruption of critical calibration values. Use Value: Ensures measurement accuracy across battery changes and firmware updates; 100-year data retention guarantees calibration validity over product lifetime. |
| Firmware Version Registry | Smart Energy Meter Security |
Use Scenario: Integrated into industrial PLC modules to log firmware revision, boot loader hash, and secure boot status after each OTA update. IC Role / Device Role / Timing Role: Persistent version-tracking memory accessed during boot sequence; supports sequential read for fast integrity verification. Use Value: Enables rollback prevention and audit trail generation; 1-MHz FM+ support allows rapid version check during cold start without delaying system initialization. | Use Scenario: Used in utility-grade electricity meters to store cryptographic keys, meter serial ID, and tariff schedule metadata with anti-tampering assurance. IC Role / Device Role / Timing Role: Tamper-resistant storage element leveraging factory-unique serial number as hardware root-of-trust anchor for key derivation. Use Value: Prevents cloning via guaranteed global uniqueness of 128-bit ID; write-protection and >4kV ESD withstand support harsh metering environments. |
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 SOIC-8 package, but lacks factory-programmed 128-bit serial number; uses standard I²C address '1010' only | No built-in serialization - requires external MCU-based ID management or additional secure element for device authentication | Select when cost sensitivity outweighs need for hardware-rooted identity; verify software-level uniqueness handling in firmware stack |
| M95M02-DFMN6TP | 2-Mbit SPI EEPROM (not I²C), 8-lead SOIC, 1.8–5.5V; no serial number; supports 20 MHz SPI clock | Interface mismatch - requires SPI-capable host and driver rewrite; higher density but no native I²C bus compatibility | Choose only if system already uses SPI peripherals and needs larger memory; not drop-in for I²C designs using AT24CS02-XHM-B |
Compared with AT24CS02-XHM-B, AT24C02D-SSHM-T offers identical memory organization and footprint but omits the hardware-secured serial number essential for zero-touch provisioning, while M95M02-DFMN6TP trades I²C simplicity for SPI bandwidth and density - neither provides the combined security, interface compatibility, and factory serialization of the AT24CS02-XHM-B.
Availability
AT24CS02-XHM-B is available at Aetrix Electronics and suitable for asset tracking, medical sensor calibration, firmware version registry, and smart energy meter security requiring stable component supply and long-term lifecycle support.
Supply support for AT24CS02-XHM-B 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 AT24CS series is designed specifically for secure, low-power embedded systems requiring guaranteed device identity and reliable nonvolatile storage - targeting applications where serialization, tamper resistance, and wide-voltage I²C interoperability are critical.
FAQ
What is the function of the WP pin on the AT24CS02-XHM-B?
The WP (Write-Protect) pin on the AT24CS02-XHM-B controls hardware-level memory locking: when tied to VCC, it disables all write operations to the entire 2-Kbit EEPROM array, preventing accidental or malicious overwrites. When grounded, normal read/write functionality is enabled. The pin is internally pulled down if left floating, but Microchip recommends a defined connection for robust operation in noisy environments. This feature directly protects calibration data and firmware metadata stored in AT24CS02-XHM-B.
Does the AT24CS02-XHM-B support 1 MHz I²C communication?
Yes, the AT24CS02-XHM-B supports 1 MHz Fast Mode Plus (FM+) I²C operation, but only when VCC is ≥2.5V. At lower supply voltages (1.7V–2.5V), it operates at up to 400 kHz Fast Mode. This dual-speed capability allows designers to maximize throughput in 3.3V/5V systems while maintaining compatibility with low-voltage 1.8V controllers at reduced speed - a key performance differentiator of the AT24CS02-XHM-B versus basic EEPROMs.
How is the 128-bit serial number accessed on the AT24CS02-XHM-B?
Access to the 128-bit serial number on the AT24CS02-XHM-B requires sending an I²C device address byte with the type identifier '1011' (0xBx) instead of the standard '1010' (0xAx) used for user memory. The 16-byte serial number resides in a dedicated, read-only memory block outside the main 256-byte EEPROM array and cannot be altered or erased. This architecture ensures that AT24CS02-XHM-B delivers immutable device identity without consuming user storage space.
What package type does the AT24CS02-XHM-B use?
The AT24CS02-XHM-B uses an 8-lead SOIC (Small Outline Integrated Circuit) package with 150-mil body width and standard gull-wing leads. This RoHS-compliant, green package is optimized for surface-mount assembly, supports reflow soldering per J-STD-020, and matches industry-standard footprints for easy integration into existing PCB layouts - confirming its physical identity as a discrete serial EEPROM component, not a module or board-level solution.
Can multiple AT24CS02-XHM-B devices share the same I²C bus?
Yes, up to eight AT24CS02-XHM-B devices can operate on a single I²C bus using hardware address pins A0, A1, and A2. Each pin can be hard-wired to GND or VCC to configure a unique 3-bit hardware address, combining with the fixed '1010' base to form a full 7-bit slave address. This cascading capability enables scalable system design - for example, a single microcontroller can manage distinct calibration profiles across eight sensor nodes, all using AT24CS02-XHM-B for consistent, serialized storage.
AT24CS02-XHM-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- 8-TSSOP
AT24CS02-XHM-B FAQ
1.How can I place an order for AT24CS02-XHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS02-XHM-B 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-XHM-B reliable?
The price and inventory of AT24CS02-XHM-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT24CS02-XHM-B is usually 5 days.
3.What payment methods are accepted for AT24CS02-XHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS02-XHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS02-XHM-B?
AT24CS02-XHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS02-XHM-B 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-XHM-B?
For technical support, including AT24CS02-XHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS02-XHM-B requirements.
6.How does Aetrix verify that AT24CS02-XHM-B is sourced from the original manufacturer or authorized distributors?
All AT24CS02-XHM-B 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-XHM-B meets industry standards.
7.What is the process for return or replacement of AT24CS02-XHM-B?
All AT24CS02-XHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS02-XHM-B, 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-XHM-B part is unused and in its original packaging.
Return procedure for AT24CS02-XHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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