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Microchip Technology AT24CS08-XHM-B
- Part No.:
- AT24CS08-XHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24CS08-XHM-B.pdf
- Description:
- IC EEPROM 8KBIT I2C 1MHZ 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,962
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Product details
Overview
AT24CS08-XHM-B 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, 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.
For engineers reviewing the AT24CS08-XHM-B datasheet, AT24CS08-XHM-B pinout, AT24CS08-XHM-B application, or AT24CS08-XHM-B equivalent, key selection considerations include its 8-pin UDFN package, absence of A1 pin (NC), dual-mode I²C timing support (400 kHz / 1 MHz), permanent read-only serial number location, and compatibility with systems requiring traceable device identity and robust low-voltage nonvolatile storage.
Technical Context
The AT24CS08-XHM-B implements a two-wire I²C slave interface with Schmitt-triggered, noise-filtered SDA/SCL inputs and internal pull-downs on A2 and WP pins. Its memory array is partitioned into 64 pages of 16 bytes each, supporting byte-write, page-write (with partial-page capability), and sequential/random read operations.
It integrates a Power-on Reset (POR) circuit with 1.5 V threshold and requires ≥100 µs delay after VCC stabilization before accepting commands. The 128-bit serial number resides in a dedicated, permanently locked memory region outside the user-accessible 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), enabling storage of firmware identifiers, calibration data, or device configuration without external address latches |
| Interface | I²C-compatible two-wire bus with 100/400 kHz Standard/Fast Mode and 1 MHz Fast Mode Plus support above 2.5V - enables high-speed programming in compact embedded systems |
| Supply voltage | 1.7V to 5.5V operation - supports direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifters |
| Standby current | Max 6 μA at 5.5V - critical for battery-powered IoT nodes and energy-harvesting devices requiring multi-year shelf life |
| Write endurance | 1,000,000 cycles - suitable for logging applications with frequent parameter updates (e.g., sensor calibration counters) |
| Data retention | 100 years at 55°C - ensures long-term reliability in automotive and industrial control modules deployed in harsh thermal environments |
| Serial number | 128-bit factory-programmed, read-only, globally unique value - eliminates need for external serialization during manufacturing and enables secure device authentication |
Pinout & Package
AT24CS08-XHM-B is supplied in an 8-pad UDFN package (2 mm × 3 mm, 0.5 mm pitch) with wettable flanks, RoHS-compliant and halide-free. Pin 1 is NC; A1 is not connected per device specification.
| 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 one of two possible I²C addresses (0x50 or 0x51); internally pulled down if floating |
| 3 (GND) | Ground Reference | System ground return path; exposed pad may be connected to GND for improved thermal 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 high (VCC) disables all writes to entire memory array; internally pulled down if left floating |
| 6 (SCL) | Serial Clock Input | Master-generated clock signal; open-drain compatible with external pull-up (≤10 kΩ); edge-triggered on rising edge for data sampling |
| 7 (SDA) | Serial Data I/O | Bidirectional open-drain bus line; requires external pull-up resistor; data latched on SCL rising edge, output on falling edge |
| 8 (Exposed Pad) | Thermal / Ground | Internally connected to die substrate; recommended connection to PCB ground plane for thermal dissipation and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Immutable, globally unique identifier stored outside user memory - enables zero-touch device provisioning and cryptographic key binding |
| 1 MHz Fast Mode Plus support | Enables 1.25× faster write throughput vs. standard 400 kHz mode when powered ≥2.5V - reduces programming time in production test fixtures |
| Hardware write protection (WP pin) | Full-array lockout with single-pin control - prevents accidental firmware corruption during field updates or brown-out conditions |
| Schmitt-triggered, filtered I/O | Immunity to bus noise up to 100 ns spikes - eliminates need for external RC filtering in electrically noisy industrial PLC or motor drive environments |
| 16-byte page write with partial capability | Allows writing 1–16 bytes per cycle without erasing adjacent locations - optimizes wear leveling and minimizes write latency for small parameter updates |
Applications
| Smart Metering | Industrial PLC Modules |
|---|---|
Use Scenario: Storing tariff tables, meter calibration constants, and tamper-event logs in electricity/water/gas meters deployed in utility substations. IC Role / Device Role / Timing Role: Nonvolatile configuration and event storage element interfaced directly to an ARM Cortex-M3/M4 MCU over I²C. Use Value: 100-year data retention and 1M write cycles ensure reliable operation over 20+ year field lifetime; 128-bit serial number enables secure remote firmware validation. | Use Scenario: Holding I/O mapping definitions, PID tuning parameters, and firmware version stamps in modular programmable logic controllers. IC Role / Device Role / Timing Role: Persistent parameter store accessed during boot and runtime by the PLC's real-time OS. Use Value: Low 6 μA standby current extends backup battery life; WP pin prevents unintended writes during power transients common in factory floor environments. |
| Medical Diagnostic Devices | Automotive Body Control Modules |
Use Scenario: Recording sensor calibration offsets, usage hours, and service history in portable ultrasound or glucose monitoring units. IC Role / Device Role / Timing Role: Secure, low-power memory for FDA-regulated traceability data linked to device serial numbers. Use Value: Factory-programmed 128-bit serial number satisfies UDI (Unique Device Identification) requirements without host-side serialization logic. | Use Scenario: Storing seat position presets, mirror adjustment profiles, and lighting configuration in vehicle door modules. IC Role / Device Role / Timing Role: I²C slave storing user preferences accessible by the BCM's microcontroller during ignition-on initialization. Use Value: 1.7V operation allows direct connection to 1.8V domain MCUs; industrial temp rating (-40°C to +85°C) meets automotive ambient requirements. |
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 UDFN | SOIC variant suits through-hole prototyping or legacy board designs where UDFN reflow is unavailable | Select when manual assembly, socket-based testing, or larger PCB footprint is acceptable |
| M95M01-RDW6TP | 8-Mbit SPI EEPROM (not I²C), no factory serial number, 2.5–5.5V supply, 5 ms write cycle | Lacks built-in serialization; requires host MCU to manage unique ID generation and storage | Choose only if system already uses SPI peripherals and serialization is handled externally |
Compared with AT24CS08-SSHM-T, the AT24CS08-XHM-B offers superior board space efficiency and thermal performance in UDFN, while M95M01-RDW6TP trades protocol compatibility and hardware serialization for higher density - making AT24CS08-XHM-B optimal for space-constrained, security-aware I²C systems.
Availability
AT24CS08-XHM-B is available at Aetrix Electronics and suitable for smart metering, industrial PLC modules, medical diagnostics, and automotive body control applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT24CS08-XHM-B 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, headquartered in Chandler, Arizona, with global design and manufacturing infrastructure.
The AT24CS08-XHM-B belongs to Microchip's CS Series Serial EEPROM product line, engineered specifically for applications demanding guaranteed device uniqueness, low-voltage operation, and industrial-grade reliability in compact form factors.
FAQ
What is the function of the NC pin on the AT24CS08-XHM-B?
The NC (No Connect) pin on the AT24CS08-XHM-B is Pin 1 in the 8-pad UDFN package and is not electrically bonded to the die. It serves no functional purpose and must remain unconnected - no routing, pull-up, or pull-down is required. This distinguishes it from the AT24CS04, which uses Pin 1 as A1; the AT24CS08-XHM-B omits A1 entirely, simplifying address configuration to A2-only.
Does the AT24CS08-XHM-B support 1 MHz I²C communication across its full voltage range?
No - the AT24CS08-XHM-B supports 1 MHz Fast Mode Plus only when VCC is between 2.5V and 5.5V. At 1.7V to 2.5V, maximum I²C speed is limited to 400 kHz Fast Mode. This voltage-dependent timing behavior is explicitly defined in the datasheet's AC Characteristics table and must be observed in system-level timing budgeting for reliable high-speed operation.
How is the 128-bit serial number accessed on the AT24CS08-XHM-B?
The 128-bit serial number on the AT24CS08-XHM-B is read using a dedicated I²C command sequence: a Start condition followed by the device address (0x50 or 0x51), then the fixed command byte 0xFA, and finally eight repeated read cycles. It resides in a separate, read-only memory region outside the main 8-Kbit array and cannot be modified, erased, or overwritten under any condition - including during device programming or power cycling.
What is the maximum write cycle time for the AT24CS08-XHM-B?
The maximum write cycle time for the AT24CS08-XHM-B is 5 ms, applicable to both byte and page write operations. This self-timed duration begins after the final ACK of the write command and ends when the device releases the SDA line (acknowledge polling returns ready). No external wait states are needed beyond this fixed timeout, enabling deterministic firmware timing for memory update routines.
Can the WP pin on the AT24CS08-XHM-B be left floating in a production design?
Although the WP pin on the AT24CS08-XHM-B has an internal pull-down, Microchip explicitly recommends against leaving it floating in production designs due to risk of capacitive coupling-induced glitches. A floating WP may intermittently enable write protection or allow unintended writes. For robust operation, WP must be hard-wired to either GND (enable writes) or VCC (disable writes), or driven via a ≤10 kΩ pull-up/down resistor.
AT24CS08-XHM-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-B FAQ
1.How can I place an order for AT24CS08-XHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS08-XHM-B 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-B reliable?
The price and inventory of AT24CS08-XHM-B 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-B is usually 5 days.
3.What payment methods are accepted for AT24CS08-XHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS08-XHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS08-XHM-B?
AT24CS08-XHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS08-XHM-B 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-B?
For technical support, including AT24CS08-XHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS08-XHM-B requirements.
6.How does Aetrix verify that AT24CS08-XHM-B is sourced from the original manufacturer or authorized distributors?
All AT24CS08-XHM-B 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-B meets industry standards.
7.What is the process for return or replacement of AT24CS08-XHM-B?
All AT24CS08-XHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS08-XHM-B, 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-B part is unused and in its original packaging.
Return procedure for AT24CS08-XHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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