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Microchip Technology AT24CS08-MAHM-T
- Part No.:
- AT24CS08-MAHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT24CS08-MAHM-T.pdf
- Description:
- IC EEPROM 8KBIT I2C 1MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT24CS08-MAHM-T from Microchip Technology is an 8-Kbit (1,024 × 8) I²C-compatible serial EEPROM with a factory-programmed, permanent 128-bit unique serial number, operating from 1.7V to 5.5V across -40°C to +85°C. It supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) I²C speeds, features hardware write protection via the WP pin, and delivers ultra-low standby current (≤6 μA). It is used for secure device identification and nonvolatile parameter storage in industrial sensor nodes and embedded control modules.
For engineers reviewing the AT24CS08-MAHM-T datasheet, AT24CS08-MAHM-T pinout, AT24CS08-MAHM-T application, or AT24CS08-MAHM-T equivalent, key selection considerations include its 8-pin UDFN package, absence of A1 pin (NC), guaranteed uniqueness of the 128-bit serial number across all CS-series devices, and compatibility with I²C bus systems requiring <6 μA standby power and industrial temperature operation.
Technical Context
The AT24CS08-MAHM-T implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA and SCL inputs, supporting bidirectional data transfer with ACK/NACK protocol and self-timed internal write cycles ≤5 ms. Its memory is organized as 64 pages of 16 bytes each, enabling partial page writes and sequential/random read modes.
Hardware addressing uses only the A2 pin (A1 is NC), allowing up to two AT24CS08 devices on a single bus. The 128-bit serial number resides in a dedicated, read-only memory region outside the user-accessible 8-Kbit array and is permanently locked during Microchip's production process.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 8 Kbit (1,024 × 8 bits), organized as 64 pages × 16 bytes - enables efficient firmware parameter storage with page-level write granularity. |
| 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 (Fast Mode Plus, ≥2.5V) - allows flexible timing budget allocation in mixed-speed bus environments. |
| Standby current | ≤6 μA at VCC = 5.5V - critical for battery-powered IoT endpoints requiring multi-year operation on coin cells. |
| Write endurance | 1,000,000 cycles - ensures reliable logging of infrequent configuration updates over product lifetime. |
| Data retention | 100 years at 55°C - guarantees long-term integrity of calibration data and security identifiers in harsh thermal environments. |
| Serial number | 128-bit factory-programmed, permanent, globally unique across all CS-series EEPROMs - eliminates need for external serialization infrastructure in manufacturing. |
| Operating temperature | -40°C to +85°C - qualified for deployment in industrial automation, automotive under-hood sensors, and outdoor metering equipment. |
Pinout & Package
AT24CS08-MAHM-T is packaged in an 8-pad UDFN (2 mm × 3 mm, 0.5 mm pitch) with exposed pad. Pin 1 is NC; pins A1 and A2 are designated per package drawing but A1 is no-connect on AT24CS08. The exposed pad may be connected to GND or left floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Not bonded; must be left unconnected - no routing or pull-up/pull-down required. |
| 2 (A2) | Device Address Input | Hard-wired to GND or VCC to set I²C slave address; enables up to two AT24CS08 devices on one bus. |
| 3 (GND) | Ground Reference | System ground return path; recommended to connect exposed pad to GND for thermal and EMI performance. |
| 4 (VCC) | Power Supply | 1.7–5.5V supply input; requires local 100 nF decoupling capacitor placed near pin. |
| 5 (WP) | Write-Protect Control | Logic low = enable writes; logic high = full-array write inhibition - provides hardware-level data integrity assurance. |
| 6 (SCL) | Serial Clock Input | Open-drain compatible; requires external pull-up; clock edges control data latching (rising) and output (falling). |
| 7 (SDA) | Serial Data I/O | Bidirectional open-drain line; shared across I²C bus; requires external pull-up ≤10 kΩ; supports wire-OR topology. |
| 8 (NC) | No Connect | Not bonded; must be left unconnected - no routing or termination needed. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Permanently programmed and locked during wafer sort; occupies no user memory space; guaranteed unique across entire CS series - removes serialization step from end-of-line manufacturing. |
| Hardware write protection (WP pin) | Dedicated pin enables full-array write lock independent of software state - prevents accidental or malicious overwrites during field operation or firmware updates. |
| Ultra-low standby current (≤6 μA) | Enables multi-year operation on primary lithium batteries in remote sensors and asset trackers without compromising memory density or interface flexibility. |
| I²C Fast Mode Plus (1 MHz) | Reduces EEPROM configuration time by up to 10× vs. Standard Mode - accelerates boot-time parameter loading in real-time control systems. |
| Schmitt-triggered, filtered I/O | Suppresses bus noise and EMI-induced glitches on SDA/SCL - improves reliability in electrically noisy industrial enclosures without external RC filtering. |
| 16-byte page write with partial writes | Allows writing 1–16 bytes per cycle without erasing full page - optimizes write latency and endurance when updating small configuration fields. |
Applications
| Industrial Sensor Calibration | Secure Device Identity Management |
|---|---|
Use Scenario: Storing factory-calibrated offset/gain coefficients and temperature compensation tables in pressure, humidity, and current-sense sensors deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile configuration storage element with guaranteed data retention over 100 years and immunity to brown-out events during power cycling. Use Value: Eliminates recalibration during field replacement; enables plug-and-play sensor swaps while preserving traceable metrology data. |
Use Scenario: Embedding immutable, globally unique identifiers into medical wearables, smart meters, and industrial gateways for secure boot, firmware signing, and anti-counterfeiting. IC Role / Device Role / Timing Role: Dedicated identity anchor providing cryptographically verifiable serial number separate from application firmware storage. Use Value: Enables zero-touch provisioning and hardware-rooted trust without consuming main EEPROM array or requiring external secure elements. |
| Embedded Controller Parameter Storage | IoT Edge Node Configuration |
Use Scenario: Retaining user-configurable settings (e.g., communication baud rate, alarm thresholds, display brightness) in HVAC controllers and PLC I/O modules after power loss. IC Role / Device Role / Timing Role: Low-voltage (1.7V) serial EEPROM supporting fast I²C access during cold-start initialization sequences. Use Value: Ensures consistent user experience across power cycles; supports brown-out tolerant write operations down to 1.7V supply. |
Use Scenario: Storing network credentials (Wi-Fi SSID/password, TLS certificates), device-specific keys, and OTA update metadata in battery-powered environmental monitors. IC Role / Device Role / Timing Role: Ultra-low-power (≤6 μA standby) nonvolatile memory enabling multi-year operation on CR2032 coin cells. Use Value: Extends battery life while maintaining secure, persistent configuration - critical for inaccessible deployments like structural health monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24CS08-SSHM-T | Same die, but in 8-lead SOIC package (5.0 mm × 4.0 mm); includes A1 pin (functional, not NC) - supports up to four devices on bus. | Preferred where board space permits larger package and higher device density on I²C bus is required. | Select AT24CS08-SSHM-T only if A1 functionality and SOIC handling are needed; AT24CS08-MAHM-T offers smaller footprint and lower profile. |
| M95M01-RMN6TP | 1-Mbit SPI EEPROM (128K × 8); no factory serial number; operates 1.8–5.5V; max SPI clock 10 MHz; standby current 5 μA. | Suitable for designs already using SPI peripherals; lacks hardware-based unique ID - requires external serialization or software management. | Choose M95M01-RMN6TP only if SPI interface is mandatory and 128-bit serial number is not required; AT24CS08-MAHM-T provides I²C simplicity and built-in identity. |
Compared with AT24CS08-SSHM-T, AT24CS08-MAHM-T saves board area and height but sacrifices A1-based bus scalability; compared with M95M01-RMN6TP, it trades SPI speed and density for I²C compatibility and integrated cryptographic identity - making it optimal for compact, secure, I²C-based edge nodes.
Availability
AT24CS08-MAHM-T is available at Aetrix Electronics and suitable for industrial sensor calibration, secure device identity management, embedded controller parameter storage, IoT edge node configuration, and medical wearable data anchoring requiring stable component supply, long-lifecycle support, and RoHS-compliant green packaging.
Supply support for AT24CS08-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 global semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with a focus on robust, low-power, and secure embedded components.
The AT24CS08-MAHM-T belongs to Microchip's CS-series Serial EEPROM family, designed specifically for applications demanding guaranteed device uniqueness, industrial-grade reliability, and seamless integration into resource-constrained I²C systems.
FAQ
What is the function of the NC pins on the AT24CS08-MAHM-T?
The AT24CS08-MAHM-T has two NC (no-connect) pins - Pin 1 and Pin 8 - which are not internally bonded and serve no electrical function. They must remain unconnected in layout; neither routing nor termination is required. This reflects the AT24CS08's simplified addressing scheme, where only A2 (Pin 2) is used for hardware address selection - unlike the AT24CS04, which utilizes both A1 and A2.
Does the AT24CS08-MAHM-T support I²C Fast Mode Plus (1 MHz) across its full voltage range?
No - AT24CS08-MAHM-T supports 1 MHz I²C operation only at VCC ≥ 2.5V. At 1.7V–2.5V, maximum clock frequency is limited to 400 kHz (Fast Mode). This voltage-dependent speed grading is specified in the AC Characteristics table (DS20006350A, Table 4-3) and must be observed to ensure reliable communication in low-voltage applications such as energy-harvesting sensor nodes.
How is the 128-bit serial number accessed on the AT24CS08-MAHM-T?
The 128-bit serial number is read using a dedicated I²C command sequence defined in Section 8.4 of the datasheet: a Start condition followed by the device address, then the fixed command byte 0xFA, and finally a repeated Start with read mode. The number resides in a protected, read-only memory region outside the main 8-Kbit array and cannot be altered or erased - it is permanently programmed and verified during Microchip's wafer-level test.
Can the WP pin on the AT24CS08-MAHM-T be left floating in a design?
Although the WP pin has an internal pull-down, Microchip explicitly recommends against leaving it floating due to risk of capacitive coupling causing spurious write-enable states. For robust operation, WP should be actively driven to GND (enable writes) or VCC (disable writes) - or pulled to GND via ≤10 kΩ resistor if permanently enabling write access. This guidance is stated in Section 2.5 of DS20006350A.
What is the maximum write cycle time for the AT24CS08-MAHM-T, and how does it affect system timing?
The AT24CS08-MAHM-T guarantees a maximum write cycle time of 5 ms, applicable to both byte and page writes. During this period, the device does not acknowledge I²C commands - requiring host firmware to implement acknowledge polling (repeated START + device address until ACK received) or fixed-delay waits. This deterministic 5 ms ceiling simplifies real-time scheduling in safety-critical systems where worst-case EEPROM latency must be bounded.
AT24CS08-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:
- 8Kbit
- Memory Organization:
- 1K 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)
AT24CS08-MAHM-T FAQ
1.How can I place an order for AT24CS08-MAHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS08-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 AT24CS08-MAHM-T reliable?
The price and inventory of AT24CS08-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 AT24CS08-MAHM-T is usually 5 days.
3.What payment methods are accepted for AT24CS08-MAHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS08-MAHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS08-MAHM-T?
AT24CS08-MAHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS08-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 AT24CS08-MAHM-T?
For technical support, including AT24CS08-MAHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS08-MAHM-T requirements.
6.How does Aetrix verify that AT24CS08-MAHM-T is sourced from the original manufacturer or authorized distributors?
All AT24CS08-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 AT24CS08-MAHM-T meets industry standards.
7.What is the process for return or replacement of AT24CS08-MAHM-T?
All AT24CS08-MAHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS08-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 AT24CS08-MAHM-T part is unused and in its original packaging.
Return procedure for AT24CS08-MAHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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