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Microchip Technology AT24CS02-MAHM-T
- Part No.:
- AT24CS02-MAHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT24CS02-MAHM-T.pdf
- Description:
- IC EEPROM 2KBIT I2C 1MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:20,314
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Product details
Overview
AT24CS02-MAHM-T from Microchip Technology is a 2-Kbit I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, organized as 256 × 8 bits, operating from 1.7V to 5.5V, and rated for -40°C to +85°C industrial temperature range. It supports 1 MHz Fast Mode Plus (2.5–5.5V), includes hardware write-protection via WP pin, and delivers ultra-low standby current of 6 μA max - used in secure device identification and configuration storage for embedded sensors and IoT edge nodes.
For engineers reviewing the AT24CS02-MAHM-T datasheet, AT24CS02-MAHM-T pinout, AT24CS02-MAHM-T application, or AT24CS02-MAHM-T equivalent, key selection considerations include its guaranteed unique serial number across the CS Series, 8-byte page write capability with ≤5 ms self-timed write cycle, Schmitt-triggered noise-immune I²C interface, and compatibility with space-constrained designs using the 8-pad UDFN package.
Technical Context
The AT24CS02-MAHM-T implements a two-wire I²C slave interface with bidirectional SDA and unidirectional SCL, supporting Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) speeds depending on VCC level. Its internal architecture integrates a dedicated 128-bit read-only serial number block separate from user memory, ensuring no consumption of the 2-Kbit EEPROM array.
It features hardware write protection via the WP pin (active-high), internally pulled-down address pins (A0–A2) enabling up to eight devices per bus, and a Power-on Reset circuit requiring ≥100 µs delay after stable VCC before command acceptance. All packages support 1.7V–5.5V operation with ESD protection >4 kV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 2 Kbit (256 × 8 bits), nonvolatile EEPROM with 100-year data retention |
| Interface | I²C-compatible two-wire serial interface with 100/400 kHz and 1 MHz FM+ support |
| Supply voltage | 1.7V to 5.5V - enables direct interfacing with 1.8V, 3.3V, and 5V microcontrollers |
| Operating temp | -40°C to +85°C - qualified for industrial-grade reliability in harsh environments |
| Write endurance | 1,000,000 cycles - supports frequent firmware parameter updates in field-deployed devices |
| Standby current | 6 μA max at 5.5V - critical for battery-powered IoT nodes requiring multi-year operation |
| Serial number | 128-bit factory-programmed, permanent, globally unique identifier across all CS Series EEPROMs |
| Write cycle time | ≤5 ms maximum - enables deterministic timing for real-time configuration writes |
Pinout & Package
AT24CS02-MAHM-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 may be connected to GND or left floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Device address input | Hard-wired to GND or VCC to configure one of eight possible I²C slave addresses (1010xxx) |
| A1 | Device address input | Part of 3-bit hardware address; enables multi-device bus topology without software reconfiguration |
| A2 | Device address input | Third bit of hardware address; internal pull-down ensures default address if left unconnected |
| GND | Ground reference | System ground connection; required for proper biasing of internal circuits and noise immunity |
| SDA | Serial data I/O | Open-drain bidirectional line; requires external pull-up resistor (≤10 kΩ); supports wire-OR bus sharing |
| SCL | Serial clock input | Unidirectional clock input; latches input data on rising edge, outputs data on falling edge |
| WP | Write-protect control | Active-high hardware lock: tied to VCC disables all writes to entire memory array |
| VCC | Power supply | 1.7V–5.5V supply input; must ramp monotonically at ≤0.1 V/µs; POR circuit enforces 100 µs post-stabilization delay |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed serial number | 128-bit value permanently written during wafer test; occupies dedicated read-only memory region outside user array |
| Noise-immune I²C interface | Schmitt-trigger inputs and integrated spike suppression filters enable robust operation in electrically noisy industrial environments |
| Page write mode | 8-byte page buffer allows partial writes within a page; reduces bus occupancy vs. byte-by-byte programming |
| Low-power standby | 6 μA max standby current at 5.5V enables energy harvesting and coin-cell applications |
| Hardware write protection | WP pin provides fail-safe, non-volatile memory lock independent of firmware state or power cycling |
| Green packaging | RoHS-compliant, halide-free, lead-free UDFN package meets environmental compliance requirements for global markets |
Applications
| Secure Device Authentication | Industrial Sensor Calibration Storage |
|---|---|
Use Scenario: Embedded systems requiring tamper-resistant identity verification during boot or firmware update. IC Role / Device Role / Timing Role: Nonvolatile storage of cryptographic keys and immutable device ID; accessed early in boot sequence via I²C. Use Value: Leverages factory-programmed 128-bit serial number to eliminate production-line serialization steps and prevent cloning. | Use Scenario: Factory-calibrated pressure or temperature sensors deployed in manufacturing equipment. IC Role / Device Role / Timing Role: Stores sensor-specific calibration coefficients and offset values; read once at power-up. Use Value: Enables plug-and-play accuracy without host MCU calibration logic; 100-year retention ensures lifetime validity. |
| Smart Meter Configuration | Medical Wearable Parameter Storage |
Use Scenario: Utility meters retaining tariff schedules, billing history, and communication settings across power cycles. IC Role / Device Role / Timing Role: Low-voltage (1.8V) EEPROM for infrequent but critical configuration writes and reads over I²C. Use Value: 1.7V minimum VCC and 6 μA standby current extend battery life while maintaining regulatory data integrity. | Use Scenario: Disposable ECG patches storing patient ID, session timestamps, and gain settings. IC Role / Device Role / Timing Role: Compact, surface-mount memory for disposable medical electronics with strict size and power constraints. Use Value: 2.0 mm × 1.6 mm UDFN package fits tight PCB footprints; 1,000,000 write cycles support repeated clinical reuse or firmware updates. |
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 serial number; uses standard AT24Cxx addressing (1010xxx) | No built-in unique ID - requires external serialization or MCU-based ID generation | Select when cost sensitivity outweighs need for hardware-enforced uniqueness and traceability |
| M95M02-DFMN6TP | 2-Mbit SPI EEPROM (not I²C); 5V-tolerant; 5 ms write cycle; no serial number; operates down to 1.8V | Requires SPI interface redesign; higher density but incompatible protocol and pinout | Choose only if migrating to SPI architecture and needing larger memory with same low-power profile |
Compared with AT24CS02-MAHM-T, the AT24C02D-SSHM-T offers identical memory functionality at lower cost but forfeits the hardware-rooted identity essential for anti-counterfeiting, while the M95M02-DFMN6TP trades I²C simplicity for SPI bandwidth and density - neither provides the guaranteed cross-series uniqueness or seamless I²C integration of the CS Series.
Availability
AT24CS02-MAHM-T is available at Aetrix Electronics and suitable for secure device authentication, industrial sensor calibration storage, and smart meter configuration requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT24CS02-MAHM-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 components, and memory solutions, with a focus on embedded control and connectivity.
The AT24CS02-MAHM-T belongs to Microchip's CS Series Serial EEPROM product line, designed specifically to simplify device identity management and secure configuration storage in resource-constrained IoT and industrial endpoints.
FAQ
What is the function of the WP pin on the AT24CS02-MAHM-T?
The WP (Write-Protect) pin on the AT24CS02-MAHM-T is an active-high hardware control that, when driven to VCC, disables all write operations to the entire 2-Kbit memory array. When connected to GND or left floating (internally pulled down), normal read and write functions operate. This feature provides fail-safe, non-volatile memory protection independent of firmware state - a critical safeguard in AT24CS02-MAHM-T deployments where accidental overwrites must be prevented.
Does the AT24CS02-MAHM-T support 1 MHz I²C communication?
Yes, the AT24CS02-MAHM-T supports 1 MHz Fast Mode Plus (FM+) I²C operation, but only when VCC is between 2.5V and 5.5V. At lower supply voltages (1.7V–2.5V), it operates in Fast Mode (400 kHz) or Standard Mode (100 kHz). This voltage-dependent speed scaling ensures reliable timing margins across its full 1.7V–5.5V operating range - a key capability confirmed in the AT24CS02-MAHM-T datasheet's AC Characteristics table.
How is the 128-bit serial number accessed on the AT24CS02-MAHM-T?
The 128-bit serial number on the AT24CS02-MAHM-T is accessed via a dedicated I²C device address: the upper 4 bits are '1011' (0xBx), unlike the standard '1010' (0xAx) used for the main EEPROM array. It resides in a separate, read-only memory block and does not consume any of the 256 × 8 user memory space. The AT24CS02-MAHM-T guarantees this serial number is globally unique across all CS Series EEPROMs - a hardware-enforced feature unavailable in standard AT24Cxx parts.
What package type is used by the AT24CS02-MAHM-T?
The AT24CS02-MAHM-T uses 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, RoHS-compliant package supports automated optical inspection and is optimized for space-constrained PCB layouts - distinct from SOIC, TSSOP, or SOT23 variants in the AT24CS01/AT24CS02 family. The exposed thermal pad may be connected to GND or left floating per design requirements.
Can the AT24CS02-MAHM-T operate reliably at 1.7V?
Yes, the AT24CS02-MAHM-T is fully specified to operate at 1.7V, including I²C communication (100 kHz or 400 kHz modes), read/write functionality, and 6 μA max standby current. Its low-voltage design enables direct interfacing with 1.8V logic families and battery-powered systems near end-of-life voltage. However, 1 MHz Fast Mode Plus is disabled below 2.5V - a verified electrical characteristic documented in the AT24CS02-MAHM-T datasheet's DC and AC Operating Range tables.
AT24CS02-MAHM-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-UFDFN Exposed Pad
- 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-UDFN (2x3)
AT24CS02-MAHM-T FAQ
1.How can I place an order for AT24CS02-MAHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS02-MAHM-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-MAHM-T reliable?
The price and inventory of AT24CS02-MAHM-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-MAHM-T is usually 5 days.
3.What payment methods are accepted for AT24CS02-MAHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS02-MAHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS02-MAHM-T?
AT24CS02-MAHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS02-MAHM-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-MAHM-T?
For technical support, including AT24CS02-MAHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS02-MAHM-T requirements.
6.How does Aetrix verify that AT24CS02-MAHM-T is sourced from the original manufacturer or authorized distributors?
All AT24CS02-MAHM-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-MAHM-T meets industry standards.
7.What is the process for return or replacement of AT24CS02-MAHM-T?
All AT24CS02-MAHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS02-MAHM-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-MAHM-T part is unused and in its original packaging.
Return procedure for AT24CS02-MAHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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