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Microchip Technology AT24CS08-XHM-T
- Part No.:
- AT24CS08-XHM-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24CS08-XHM-T.pdf
- Description:
- IC EEPROM 8KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,472
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Product details
Overview
AT24CS08-XHM-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, supporting 1 MHz Fast Mode Plus at 2.5–5.5V, and rated for -40°C to +85°C industrial temperature range. It delivers ultra-low standby current (6 μA max) and integrates hardware write protection via the WP pin.
For engineers reviewing the AT24CS08-XHM-T datasheet, AT24CS08-XHM-T pinout, AT24CS08-XHM-T application, or AT24CS08-XHM-T equivalent, key selection criteria include its guaranteed-unique serialization capability, dual-voltage I²C timing compliance (100/400 kHz standard/fast modes and 1 MHz FM+), page-write endurance (1M cycles), 100-year data retention, and 8-pad UDFN package compatibility with space-constrained embedded systems.
Technical Context
The AT24CS08-XHM-T implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and internal pull-downs on A2, WP, and (NC) A1 pins. Its memory array is organized as 64 pages × 16 bytes, supporting byte and 16-byte page writes with self-timed completion in ≤5 ms.
It features dedicated hardware write protection (WP pin), power-on reset (POR) with 100 µs tPUP delay, and a permanently locked 128-bit serial number stored outside user memory - ensuring uniqueness across all Microchip CS-series EEPROMs without consuming any of the 8-Kbit user address space.
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 minimal bus overhead. |
| 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, 2.5–5.5V) - ensures compatibility with legacy and high-speed host controllers. |
| Write endurance | 1,000,000 cycles - suitable for logging, calibration, or configuration updates in field-deployed equipment. |
| Data retention | 100 years at 55°C - guarantees long-term reliability for medical, industrial, and automotive applications. |
| Standby current | 6 μA max at 5.5V - minimizes quiescent power in battery-backed or energy-harvesting systems. |
| Serial number | 128-bit factory-programmed, read-only, globally unique across CS series - eliminates need for external serialization during manufacturing. |
Pinout & Package
AT24CS08-XHM-T is supplied in an 8-pad UDFN (2 mm × 3 mm, 0.5 mm pitch) package with wettable flanks, RoHS-compliant and halide-free. The exposed pad is optional and may be connected to GND or left floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No-connect | Internally unconnected; must be left floating or tied to GND - no functional impact. |
| 2 (A2) | Device address input | Hard-wired to GND or VCC to set I²C slave address; enables up to two AT24CS08 devices per bus. |
| 3 (GND) | Ground reference | System ground return path; required for stable operation and noise immunity. |
| 4 (VCC) | Power supply | 1.7–5.5V supply input; must ramp monotonically at ≤0.1 V/µs during power-up. |
| 5 (WP) | Write-protect control | Low = enable writes; high = full-array protection; internally pulled down if floating. |
| 6 (SCL) | Serial clock input | Open-drain compatible; requires external pull-up; controls data sampling timing (rising edge latch). |
| 7 (SDA) | Serial data I/O | Bidirectional open-drain line; requires external pull-up; transmits ACK/NACK on ninth clock cycle. |
| 8 (NC) | No-connect | Internally unconnected; must be left floating or tied to GND - no functional impact. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Permanently programmed and locked during wafer test - provides traceability without consuming user memory or requiring post-silicon programming. |
| Hardware write protection (WP pin) | Full-array lockout when WP = VCC - prevents accidental overwrites during firmware updates or brown-out conditions. |
| Schmitt-triggered, filtered I/O | Robust noise immunity on SDA/SCL - eliminates false start/stop detection in electrically noisy industrial environments. |
| 16-byte page write mode | Partial-page writes supported - allows efficient small-data updates without erasing entire pages. |
| Ultra-low power consumption | 3 mA active max, 6 μA standby max - extends battery life in portable and IoT endpoint devices. |
Applications
| Asset Tracking Tag | Industrial PLC Module |
|---|---|
Use Scenario: Embedded in reusable logistics tags to store unique device ID, calibration history, and usage counters across multiple supply chain handoffs. IC Role / Device Role / Timing Role: Nonvolatile configuration and identity storage with guaranteed uniqueness per unit. Use Value: Eliminates manual serialization steps; enables automated inventory reconciliation using the factory-programmed 128-bit serial number. | Use Scenario: Mounted on programmable logic controller backplanes to retain firmware revision, I/O mapping, and safety-critical configuration parameters after power loss. IC Role / Device Role / Timing Role: Persistent parameter storage with hardware write protection against runtime corruption. Use Value: WP pin ensures configuration integrity during unexpected resets or EMI events; 100-year retention meets industrial lifecycle requirements. |
| Medical Sensor Calibration | Smart Energy Meter |
Use Scenario: Stores sensor-specific offset/gain coefficients and calibration timestamps inside portable diagnostic devices certified to IEC 60601. IC Role / Device Role / Timing Role: Secure, low-power nonvolatile memory for safety-critical calibration data. Use Value: 1.7V operation enables direct connection to low-voltage analog front-ends; 1M write cycles support field recalibration. | Use Scenario: Retains tariff tables, metering logs, and cryptographic keys in utility-grade electricity meters deployed in harsh outdoor environments. IC Role / Device Role / Timing Role: Industrial-grade EEPROM with extended temperature (-40°C to +85°C) and high-reliability data retention. Use Value: 100-year data retention and 6 μA standby current ensure accuracy and security over 20+ year field deployments without maintenance. |
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 capacity and serial number feature, but in 8-lead SOIC package (5.0 mm × 4.0 mm) instead of 8-pad UDFN. | SOIC offers easier prototyping and rework; UDFN saves board area in high-density designs. | Select AT24CS08-SSHM-T for through-hole or hand-soldered evaluation; choose AT24CS08-XHM-T for miniaturized production PCBs. |
| M95M08-DWDW | 8-Mbit SPI EEPROM (not I²C); no factory serial number; 2.5–5.5V only; higher active current (5 mA typical). | Requires SPI interface and additional GPIOs; lacks built-in serialization for device identity. | Choose only if system already uses SPI peripherals and serialization is handled externally; not drop-in for I²C or serial-number-dependent use cases. |
Compared with AT24CS08-SSHM-T, AT24CS08-XHM-T reduces footprint by >70% while maintaining identical electrical behavior and serialization capability; versus M95M08-DWDW, it offers native I²C compatibility, lower voltage operation (1.7V), and guaranteed unique identification - critical for secure device onboarding.
Availability
AT24CS08-XHM-T is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and smart metering applications requiring stable component supply, long-term lifecycle assurance, and guaranteed-unique device identity.
Supply support for AT24CS08-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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified manufacturing and global distribution.
The AT24CS08-XHM-T belongs to Microchip's CS-series serial EEPROM product line, designed specifically to simplify device authentication and manufacturing traceability through factory-programmed, globally unique 128-bit identifiers - eliminating post-production serialization overhead.
FAQ
What is the function of the NC pins on the AT24CS08-XHM-T?
The AT24CS08-XHM-T has two NC (no-connect) pins - Pin 1 and Pin 8 - which are internally unconnected and serve no electrical function. They may be left floating or tied to GND for mechanical stability or ESD mitigation, but must never be driven or used as signal paths. This differs from the AT24CS04, where Pin 1 is A1; the AT24CS08-XHM-T does not implement A1, confirming its two-device addressing limit.
Does the AT24CS08-XHM-T support 1 MHz I²C communication across its full voltage range?
No - the AT24CS08-XHM-T supports 1 MHz Fast Mode Plus (FM+) only within the 2.5V to 5.5V VCC range. At 1.7V to 2.5V, maximum I²C speed is limited to 400 kHz Fast Mode. This voltage-dependent timing is explicitly defined in the DS20006350A datasheet Section 4.4, and attempting 1 MHz operation below 2.5V violates AC specifications and may cause communication failures.
How is the 128-bit serial number accessed on the AT24CS08-XHM-T?
The 128-bit serial number on the AT24CS08-XHM-T is read using a dedicated I²C command sequence: a Start condition followed by the device address (0x50–0x57), then the serial number read command (0xFA), and finally a repeated Start before reading 16 bytes from address 0x00–0x0F. This area is read-only, resides outside the main 8-Kbit memory map, and cannot be altered - verified in DS20006350A Section 8.4 and Figure 8-4.
Can the WP pin on the AT24CS08-XHM-T be left unconnected?
Although the WP pin on the AT24CS08-XHM-T is internally pulled down to GND when floating, Microchip explicitly recommends connecting it to a known state (GND for write-enable, VCC for full protection) due to potential capacitive coupling in real-world layouts. Leaving WP floating risks intermittent write-enable behavior under EMI or fast transients - confirmed in DS20006350A Section 2.5 and Table 2-2.
What is the maximum page write time for the AT24CS08-XHM-T?
The maximum self-timed write cycle time for the AT24CS08-XHM-T - whether performing a single-byte or full 16-byte page write - is 5 ms, as specified in DS20006350A Section 4.4 (tWR parameter) and Section 7.4. During this period, the device does not acknowledge I²C commands; hosts must use acknowledge polling or fixed-delay waits before issuing subsequent operations.
AT24CS08-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:
- 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-TSSOP
AT24CS08-XHM-T FAQ
1.How can I place an order for AT24CS08-XHM-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS08-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 AT24CS08-XHM-T reliable?
The price and inventory of AT24CS08-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 AT24CS08-XHM-T is usually 5 days.
3.What payment methods are accepted for AT24CS08-XHM-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS08-XHM-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS08-XHM-T?
AT24CS08-XHM-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS08-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 AT24CS08-XHM-T?
For technical support, including AT24CS08-XHM-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS08-XHM-T requirements.
6.How does Aetrix verify that AT24CS08-XHM-T is sourced from the original manufacturer or authorized distributors?
All AT24CS08-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 AT24CS08-XHM-T meets industry standards.
7.What is the process for return or replacement of AT24CS08-XHM-T?
All AT24CS08-XHM-T units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS08-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 AT24CS08-XHM-T part is unused and in its original packaging.
Return procedure for AT24CS08-XHM-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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