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Microchip Technology AT24CS08-MAHM-E
- Part No.:
- AT24CS08-MAHM-E
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-UFDFN Exposed Pad
- Datasheet:
-
AT24CS08-MAHM-E.pdf
- Description:
- IC EEPROM 8KBIT I2C 1MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,793
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Product details
Overview
AT24CS08-MAHM-E from Microchip Technology is an 8-Kbit I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, organized as 1,024 × 8-bit memory array, 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 - used for secure device identification and configuration storage in embedded control modules.
For engineers reviewing the AT24CS08-MAHM-E datasheet, AT24CS08-MAHM-E pinout, AT24CS08-MAHM-E application, or AT24CS08-MAHM-E equivalent, key selection criteria include I²C bus compatibility up to 1 MHz, factory-locked 128-bit serialization, hardware write protection, low-voltage operation down to 1.7V, and industrial-grade reliability with 1M write cycles and 100-year data retention.
Technical Context
The AT24CS08-MAHM-E implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and internal pull-downs on A2, WP, and A1 (NC on AT24CS08). It uses a dedicated high-voltage generation circuit for EEPROM programming and integrates Power-on Reset (POR) with 100 µs tPUP delay after stable VCC.
Memory is organized into 64 pages of 16 bytes each, supporting byte-write, page-write (with partial-page capability), and sequential/random read modes. The 128-bit serial number resides in a separate, permanently locked memory region outside the user-addressable 8-Kbit array and is guaranteed unique across all Microchip CS Series EEPROMs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 8 Kbit (1,024 × 8 bits), nonvolatile EEPROM storage |
| Interface | I²C-compatible two-wire bus: supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz at 2.5–5.5V) |
| Supply Voltage | 1.7V to 5.5V - enables direct interfacing with 1.8V, 2.5V, 3.3V, and 5V microcontrollers without level shifting |
| Serial Number | 128-bit factory-programmed, read-only, globally unique identifier stored outside user memory space |
| Write Endurance | 1,000,000 write cycles - ensures long-term field reliability in firmware update or calibration logging applications |
| Data Retention | 100 years at 55°C - guarantees persistent storage integrity over full product lifecycle under industrial thermal stress |
| Standby Current | ≤6 μA at 5.5V - minimizes system power budget in battery-backed or energy-harvesting designs |
| Operating Temp | -40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor IoT endpoints |
Pinout & Package
AT24CS08-MAHM-E is supplied in an 8-pad UDFN package (2.0 mm × 1.6 mm, 0.5 mm pitch) with wettable flank leads and exposed pad (recommended to be connected to GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NC | No-connect terminal | Not bonded; electrically isolated - must be left unconnected per datasheet |
| A2 | Device address input | Hard-wired to GND or VCC to configure one of two possible I²C addresses (0x50 or 0x51); enables dual-device bus sharing |
| GND | Ground reference | System return path for VCC and logic signals; exposed pad should be tied to GND for thermal and EMI performance |
| VCC | Power supply input | Accepts 1.7–5.5V; internal POR activates only after stable VCC ≥1.5V and tPUP ≥100 µs delay |
| WP | Hardware write-protect | Logic-high (VCC) disables all writes to entire memory array; internally pulled down if floating - requires explicit biasing |
| SCL | Serial clock input | Open-drain compatible; accepts 100 kHz–1 MHz clocks; incorporates noise filtering and Schmitt trigger |
| SDA | Serial data bidirectional | Open-drain I/O; requires external pull-up (≤10 kΩ); latches input on SCL rising edge, drives output on falling edge |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Serialized ID | 128-bit immutable serial number - eliminates need for post-manufacturing serialization and enables secure device authentication |
| Multi-Voltage I²C | Full 1 MHz Fast Mode Plus support at 2.5–5.5V and 400 kHz operation down to 1.7V - simplifies mixed-voltage system integration |
| Hardware Write Protection | Dedicated WP pin with internal pull-down - provides fail-safe, board-level memory lock independent of firmware state |
| Low-Power Operation | 3 mA max active current and 6 μA max standby current - extends battery life in portable and remote sensor nodes |
| Robust Bus Interface | Schmitt-triggered inputs with spike suppression filters - maintains reliable communication in electrically noisy industrial environments |
Applications
| Secure Device Authentication | Firmware Configuration Storage |
|---|---|
Use Scenario: Embedded systems requiring cryptographic binding between hardware identity and software image, such as industrial PLCs or medical diagnostics devices. IC Role / Device Role / Timing Role: AT24CS08-MAHM-E serves as tamper-resistant identity anchor, providing factory-locked 128-bit serial number for secure boot key derivation and device attestation. Use Value: Eliminates external secure element dependency by delivering cryptographically verifiable, globally unique identity directly from EEPROM silicon. | Use Scenario: Consumer smart appliances storing calibrated sensor offsets, user preferences, and operational history across power cycles. IC Role / Device Role / Timing Role: AT24CS08-MAHM-E acts as nonvolatile configuration register bank, retaining settings during brownouts and enabling zero-latency resume after reset. Use Value: Enables field-upgradable calibration and personalization without requiring MCU flash wear leveling or external backup capacitors. |
| Industrial Sensor Node Calibration | Automotive Body Control Module ID |
Use Scenario: Factory-calibrated temperature/humidity sensors deployed in HVAC systems or environmental monitoring networks. IC Role / Device Role / Timing Role: AT24CS08-MAHM-E stores per-unit calibration coefficients and sensor-specific metadata, accessed via I²C during initialization. Use Value: Guarantees traceable, permanent calibration data storage with 100-year retention - avoids recalibration drift and field service costs. | Use Scenario: Automotive interior modules (e.g., seat control, lighting) requiring OEM-specified part identification and revision tracking. IC Role / Device Role / Timing Role: AT24CS08-MAHM-E holds vehicle-specific configuration, production date code, and assembly line ID for diagnostic and recall traceability. Use Value: Meets ISO/TS 16949 traceability requirements using factory-programmed serial number and user-writable fields in single compact package. |
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 8-Kbit memory, identical serial number and electrical specs, but in 8-lead SOIC package (5.0 mm × 4.0 mm) | Larger footprint; better suited for prototyping, manual soldering, or legacy PCB layouts with SOIC footprints | Select when board space permits larger package or reworkability is prioritized over miniaturization. |
| M95M01-RMN6TP | 1-Mbit SPI EEPROM (not I²C), no factory serial number, 2.5–5.5V supply, 10 MHz SPI clock | Requires SPI interface and additional GPIO for chip select; lacks built-in serialization - needs external UID management | Choose only if system already uses SPI peripherals and serialization is handled elsewhere; not drop-in for I²C or serial ID use cases. |
Compared with AT24CS08-SSHM-T, the AT24CS08-MAHM-E offers superior board-area efficiency in UDFN format while maintaining identical functionality; versus M95M01-RMN6TP, it provides native I²C compatibility and integrated 128-bit UID - eliminating firmware complexity and external UID provisioning.
Availability
AT24CS08-MAHM-E is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, and IoT endpoint designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT24CS08-MAHM-E 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, manufacturing, and sales operations.
The AT24CS08-MAHM-E belongs to Microchip's CS Series Serial EEPROM family, engineered specifically for secure, low-power, and space-constrained applications requiring factory-assigned unique identifiers and robust I²C interoperability.
FAQ
What is the function of the NC pin on the AT24CS08-MAHM-E?
The NC (No Connect) pin on the AT24CS08-MAHM-E is electrically unconnected and not bonded to the die. Per Microchip's DS20006350A datasheet, it must remain unconnected in the PCB layout - routing or terminating this pin may cause unintended behavior or violate qualification testing conditions. This differs from the AT24CS04, where Pin 1 is A1; on AT24CS08-MAHM-E, Pin 1 is NC.
Does the AT24CS08-MAHM-E support 1 MHz I²C communication across its full voltage range?
No - the AT24CS08-MAHM-E supports 1 MHz Fast Mode Plus only at VCC = 2.5V to 5.5V. At 1.7V to 2.5V, maximum clock frequency is limited to 400 kHz. This voltage-dependent timing is specified in Table 4-3 of the official datasheet and must be enforced in system firmware to ensure reliable ACK/NACK handshaking and data integrity.
How is the 128-bit serial number accessed on the AT24CS08-MAHM-E?
The 128-bit serial number on the AT24CS08-MAHM-E is read using a dedicated I²C command sequence defined in Section 8.4 of the datasheet: a Start condition followed by the device address (0x50 or 0x51), then the serial number read command (0xFA), and finally a repeated Start before reading 16 bytes. It resides in a separate, read-only memory block and does not consume any of the 8-Kbit user EEPROM array.
Can the WP pin on the AT24CS08-MAHM-E be left floating in the circuit?
No - although the WP pin has an internal pull-down, Microchip explicitly recommends connecting it to a known logic state (GND for write-enable, VCC for full-array protection). Floating WP risks noise-induced transitions due to capacitive coupling, potentially causing intermittent write failures or accidental memory lock. A 10 kΩ or lower pull-up/down resistor is advised per Section 2.5 of DS20006350A.
What is the memory organization of the AT24CS08-MAHM-E and how does it affect page writes?
The AT24CS08-MAHM-E organizes its 8-Kbit array into 64 pages of 16 bytes each. Page write mode allows up to 16 bytes to be written in a single I²C transaction, provided all addresses fall within the same page boundary (e.g., addresses 0x00–0x0F). Crossing a page boundary during a page write will cause wraparound to the start of the same page - a critical constraint that firmware must enforce to avoid unintended overwrites.
AT24CS08-MAHM-E 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-E FAQ
1.How can I place an order for AT24CS08-MAHM-E through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS08-MAHM-E 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-E reliable?
The price and inventory of AT24CS08-MAHM-E 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-E is usually 5 days.
3.What payment methods are accepted for AT24CS08-MAHM-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS08-MAHM-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS08-MAHM-E?
AT24CS08-MAHM-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS08-MAHM-E 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-E?
For technical support, including AT24CS08-MAHM-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS08-MAHM-E requirements.
6.How does Aetrix verify that AT24CS08-MAHM-E is sourced from the original manufacturer or authorized distributors?
All AT24CS08-MAHM-E 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-E meets industry standards.
7.What is the process for return or replacement of AT24CS08-MAHM-E?
All AT24CS08-MAHM-E units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS08-MAHM-E, 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-E part is unused and in its original packaging.
Return procedure for AT24CS08-MAHM-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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