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Microchip Technology AT24CS02-XHM-T
- Part No.:
- AT24CS02-XHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24CS02-XHM-T.pdf
- Description:
- IC EEPROM 2KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,413
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Product details
Overview
AT24CS02-XHM-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 operation, and hardware write protection via WP pin - deployed in industrial sensor calibration, secure boot credential storage, and embedded device identity management.
For engineers reviewing the AT24CS02-XHM-T datasheet, AT24CS02-XHM-T pinout, AT24CS02-XHM-T application, or AT24CS02-XHM-T equivalent, key selection factors include guaranteed uniqueness of the 128-bit serial number across all CS-series devices, Fast Mode Plus (1 MHz) support at ≥2.5V, and 8-lead UDFN package compatibility with space-constrained PCB layouts.
Technical Context
The AT24CS02-XHM-T operates as an I²C slave device with fixed 7-bit address prefix 0b1010 for main memory and 0b1011 for serial number access. It implements Schmitt-triggered, filtered SDA/SCL inputs and internal pull-downs on A0/A1/A2/WP pins to ensure robust noise immunity in noisy industrial environments.
Its memory architecture supports byte and 8-byte page writes with self-timed erase/write cycles ≤5 ms, and includes dedicated hardware write protection that disables all memory writes when WP = VCC - independent of software control or I²C command state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8), organized in 32 pages of 8 bytes each |
| Supply voltage | 1.7V to 5.5V - enables direct interface with 1.8V, 3.3V, and 5V microcontrollers without level shifters |
| I²C speed modes | Standard (100 kHz), Fast (400 kHz), Fast Mode Plus (1 MHz @ 2.5–5.5V) |
| Serial number | 128-bit factory-programmed, read-only, globally unique across entire CS series - occupies separate address space, no user memory overhead |
| Write endurance | 1,000,000 cycles - validated at 3.3V/25°C, suitable for frequent calibration data updates |
| Data retention | 100 years at 55°C - ensures long-term reliability in sealed industrial enclosures |
| Active current | ≤3.0 mA max at 5.0V/400 kHz - minimizes power impact during active reads/writes |
| Standby current | ≤6.0 μA max at 5.5V - supports ultra-low-power sleep states in battery-operated edge nodes |
Pinout & Package
AT24CS02-XHM-T is supplied in an 8-pad UDFN (2 mm × 3 mm, 0.5 mm pitch) package with wettable flank leads for automated optical inspection (AOI). The exposed pad is internally connected to GND and may be soldered to PCB ground plane for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware slave address input | Hardwired to GND or VCC to configure one of eight possible I²C addresses (0x50–0x57); internally pulled down if floating |
| A1 | Hardware slave address input | Second bit of 3-bit hardware address; enables multi-device bus topology without software address conflict |
| A2 | Hardware slave address input | Third bit of 3-bit hardware address; allows up to eight AT24CS02-XHM-T devices on same I²C bus |
| GND | Power ground reference | Common return path for VCC and signal currents; must be low-impedance connection to system ground plane |
| SDA | Bidirectional open-drain data line | Requires external pull-up resistor (≤10 kΩ); supports wire-OR with other I²C devices; Schmitt-triggered for noise immunity |
| SCL | Input clock line | Master-generated clock; rising edge latches input data, falling edge outputs data; filtered and Schmitt-triggered |
| WP | Hardware write-protect enable | Logic high (VCC) disables all write operations to main memory - provides tamper-resistant configuration lock |
| VCC | Power supply input | Accepts 1.7–5.5V; internal POR circuit enforces 100 µs delay after stable VCC before accepting commands |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Permanently programmed during wafer test; globally unique across all CS-series EEPROMs; zero user memory cost |
| Triple-speed I²C interface | Supports 100 kHz, 400 kHz, and 1 MHz (FM+) - enables high-throughput firmware update logging without bus contention |
| Hardware write protection | WP pin disables all memory writes when tied to VCC - eliminates risk of accidental overwrites during field firmware updates |
| Ultra-low standby current | ≤6 μA at 5.5V - extends battery life in always-on IoT sensors and portable diagnostic tools |
| Industrial temperature range | -40°C to +85°C - qualified for deployment in automotive under-hood modules and factory automation controllers |
Applications
| Secure Device Identity | Sensor Calibration Storage |
|---|---|
Use Scenario: Assigning cryptographically verifiable identity to edge nodes in a distributed IIoT network. IC Role / Device Role / Timing Role: Non-volatile storage of immutable 128-bit serial number used as hardware root-of-trust seed for TLS certificate generation. Use Value: Eliminates need for post-manufacturing serialization; enables zero-touch provisioning with deterministic, collision-free device IDs. | Use Scenario: Storing factory-calibrated coefficients for MEMS pressure sensors in medical ventilators. IC Role / Device Role / Timing Role: Retentive storage of 8-byte calibration parameters accessed at power-on by MCU ADC driver. Use Value: Ensures measurement accuracy traceability across 100-year data retention window, even after repeated sterilization cycles. |
| Firmware Configuration Lock | Industrial Controller Boot Security |
Use Scenario: Preventing unauthorized modification of operational parameters in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Hardware-enforced write lock on critical configuration registers using WP pin tied to secure supervisor rail. Use Value: Guarantees parameter integrity against malware or misconfigured HMI writes - no software bypass possible. | Use Scenario: Storing cryptographic keys and secure boot hash values in rail-side signaling controllers. IC Role / Device Role / Timing Role: Tamper-resistant non-volatile memory for bootloader verification assets accessed during cold start. Use Value: Meets EN 50129 SIL-2 requirements for safety-critical data retention under extended temperature cycling (-40°C to +85°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24CS02-SSHM-T | Same die, 8-lead SOIC package (5.0 mm × 4.0 mm); no wettable flanks; 0.5 mm lead pitch | Preferred for through-hole prototyping or legacy reflow profiles incompatible with UDFN thermal mass | Select when board assembly uses SOIC-compatible pick-and-place or requires manual rework accessibility. |
| M24C02-RMN6TP | 2-Kbit I²C EEPROM with 1.7–5.5V operation but no factory serial number; 8-lead TSSOP package | Lacks hardware-unique ID - requires external serialization infrastructure for device identity use cases | Select only when serial number functionality is unnecessary and cost sensitivity outweighs traceability requirements. |
Compared with AT24CS02-XHM-T, the AT24CS02-SSHM-T offers identical electrical and functional behavior in a larger SOIC package ideal for development, while M24C02-RMN6TP sacrifices the critical 128-bit unique serial number - making it unsuitable for secure identity or zero-touch provisioning systems requiring guaranteed uniqueness.
Availability
AT24CS02-XHM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, secure device identity provisioning, and firmware configuration lock applications requiring stable component supply across multi-year production lifecycles.
Supply support for AT24CS02-XHM-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 Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The AT24CS02-XHM-T belongs to Microchip's CS-series Serial EEPROM product line, engineered specifically for applications demanding guaranteed device uniqueness, industrial-grade reliability, and seamless integration into secure embedded systems.
FAQ
What is the factory-programmed serial number capability of the AT24CS02-XHM-T?
The AT24CS02-XHM-T contains a permanently programmed, read-only 128-bit serial number that is globally unique across all CS-series EEPROMs - including AT24CS01, AT24CS02, and future variants. This serial number resides in a dedicated memory block outside the user-accessible 2-Kbit array and is programmed during Microchip's wafer-level test process. It cannot be altered, erased, or overwritten after shipment, and requires a distinct I²C address prefix (0b1011) for access.
Does the AT24CS02-XHM-T support 1 MHz I²C communication?
Yes, the AT24CS02-XHM-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), maximum speed is limited to 400 kHz (Fast mode). The device automatically adapts to the bus speed negotiated by the master, and its Schmitt-triggered, filtered SDA/SCL inputs maintain signal integrity at full FM+ rates.
How does the WP pin function on the AT24CS02-XHM-T?
The WP (Write-Protect) pin on the AT24CS02-XHM-T provides hardware-level write inhibition: when driven to VCC, it disables all write operations to the main 2-Kbit memory array - including byte, page, and sequential writes - regardless of I²C command content. When WP is at GND or left floating (internally pulled down), normal write functionality is enabled. This feature is independent of software control and cannot be overridden by I²C commands.
What package type is used for the AT24CS02-XHM-T?
The AT24CS02-XHM-T is packaged in an 8-pad UDFN (Ultra Thin Dual Flat No-lead) measuring 2.0 mm × 3.0 mm with 0.5 mm pitch and wettable flank leads. The exposed thermal pad is internally connected to GND and is designed for soldering to the PCB ground plane to enhance thermal dissipation and EMI performance - critical for dense, thermally constrained industrial PCB layouts.
What is the data retention and endurance specification for the AT24CS02-XHM-T?
The AT24CS02-XHM-T guarantees 100 years of data retention at 55°C and 1,000,000 write/erase cycles per memory location - both validated per JEDEC standards at 3.3V and 25°C. These specifications apply to the entire 2-Kbit memory array (256 × 8 bits) and are unaffected by use of the 128-bit serial number region, which is read-only and not subject to wear-out mechanisms.
AT24CS02-XHM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- 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:
- 8-TSSOP
AT24CS02-XHM-T FAQ
1.How can I place an order for AT24CS02-XHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS02-XHM-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-XHM-T reliable?
The price and inventory of AT24CS02-XHM-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-XHM-T is usually 5 days.
3.What payment methods are accepted for AT24CS02-XHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS02-XHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS02-XHM-T?
AT24CS02-XHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS02-XHM-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-XHM-T?
For technical support, including AT24CS02-XHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS02-XHM-T requirements.
6.How does Aetrix verify that AT24CS02-XHM-T is sourced from the original manufacturer or authorized distributors?
All AT24CS02-XHM-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-XHM-T meets industry standards.
7.What is the process for return or replacement of AT24CS02-XHM-T?
All AT24CS02-XHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS02-XHM-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-XHM-T part is unused and in its original packaging.
Return procedure for AT24CS02-XHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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