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Microchip Technology AT24CS16-XHM-B
- Part No.:
- AT24CS16-XHM-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AT24CS16-XHM-B.pdf
- Description:
- IC EEPROM 16KBIT I2C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,164
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Product details
Overview
AT24CS16-XHM-B from Microchip Technology is a 16-Kbit I²C-compatible serial EEPROM with factory-programmed 128-bit unique serial number, organized as 2,048 × 8 bits, operating from 1.7V to 5.5V, and rated for -40°C to +85°C industrial temperature range. It supports Standard (100 kHz), Fast (400 kHz), and Fast Mode Plus (1 MHz) I²C speeds and includes hardware write protection via WP pin.
For engineers reviewing the AT24CS16-XHM-B datasheet, AT24CS16-XHM-B pinout, AT24CS16-XHM-B application, or AT24CS16-XHM-B equivalent, this device serves in secure device identification, configuration storage, and calibration data retention where guaranteed uniqueness, low-voltage operation, and robust I²C timing compliance are required.
Technical Context
The AT24CS16-XHM-B 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 software reset capability. Its internal architecture includes dedicated 128-bit read-only serial number memory block-physically isolated from user EEPROM array and uniquely guaranteed across the entire CS Series.
It features on-chip high-voltage generation for EEPROM programming, power-on reset (POR) circuitry with 100 µs tPUP delay, and automatic standby mode entry after Stop condition or write completion. Write protection is enforced by WP pin state: tied to VCC disables all writes; tied to GND enables full-array writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 16 Kbit (2,048 × 8), enabling compact nonvolatile storage for firmware parameters or sensor calibration tables |
| I²C speed modes | 100 kHz (1.7–5.5V), 400 kHz (1.7–5.5V), 1 MHz FM+ (2.5–5.5V) - supports scalable bus timing across voltage domains |
| Supply voltage | 1.7V to 5.5V - interoperable with 1.8V, 3.3V, and 5V microcontrollers without level shifting |
| Write endurance | 1,000,000 cycles - suitable for frequent field-updatable configuration or logging use cases |
| Data retention | 100 years at 55°C - ensures long-term reliability in unattended industrial deployments |
| Standby current | ≤6 µA at 5.5V - minimizes quiescent power in battery-backed or energy-harvesting systems |
| Serial number | 128-bit factory-programmed, permanent, globally unique across CS Series - eliminates need for external serialization infrastructure |
Pinout & Package
AT24CS16-XHM-B is supplied in an 8-lead SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), with pin 1 marked by notch or dot. All pins are surface-mount compatible and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unconnected; must be left floating or tied to GND/VCC per layout best practice - no functional impact |
| 2 (NC) | No Connect | Internally unconnected; no electrical or thermal function - no routing required |
| 3 (NC) | No Connect | Internally unconnected; unused pad - may be omitted from PCB footprint if space-constrained |
| 4 (GND) | Ground reference | System return path for VCC and I/O; requires low-impedance connection to PCB ground plane |
| 5 (SDA) | Serial Data I/O | Open-drain bidirectional line; requires external 1.3–10 kΩ pull-up resistor to VCC for proper I²C bus operation |
| 6 (SCL) | Serial Clock input | Master-generated clock; must be pulled high when idle; tolerates ≤300 ns rise/fall times per AC specs |
| 7 (WP) | Hardware write protect | Active-high signal: logic high (≥0.7×VCC) locks entire EEPROM array; floating defaults to GND via internal pull-down |
| 8 (VCC) | Power supply | 1.7–5.5V supply input; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed 128-bit serial number | Permanently programmed during wafer test; occupies separate memory space and does not reduce user EEPROM capacity |
| Three-speed I²C compatibility | Enables same part to serve legacy (100 kHz), mainstream (400 kHz), and high-throughput (1 MHz FM+) designs without redesign |
| Ultra-low standby current (≤6 µA) | Reduces system-level sleep-mode power budget - critical for coin-cell or energy-harvesting applications |
| Page write with partial-page support | Allows writing 1–16 bytes per transaction; avoids unnecessary erase/write cycles and improves update efficiency |
| ESD protection >4 kV HBM | Meets industrial handling requirements; reduces need for external ESD protection on board |
Applications
| Secure Device Authentication | Industrial Sensor Calibration |
|---|---|
Use Scenario: Embedded gateway authenticates peripheral modules using cryptographically signed challenges bound to hardware identity. IC Role / Device Role / Timing Role: AT24CS16-XHM-B provides immutable, factory-assigned 128-bit serial number used as root-of-trust identifier in challenge-response protocols. Use Value: Eliminates need for post-manufacturing serialization; prevents cloning via guaranteed global uniqueness across Microchip's CS Series EEPROMs. | Use Scenario: Factory-calibrated pressure sensor stores offset/gain coefficients and temperature compensation tables in nonvolatile memory. IC Role / Device Role / Timing Role: AT24CS16-XHM-B retains calibration data across power cycles and supports repeated field updates during maintenance. Use Value: 1,000,000 write cycles and 100-year data retention ensure lifetime calibration integrity in harsh environments. |
| Medical Device Configuration | Smart Energy Metering |
Use Scenario: Portable diagnostic instrument stores user preferences, regulatory settings, and audit logs requiring tamper-resistant storage. IC Role / Device Role / Timing Role: AT24CS16-XHM-B holds configuration registers and event logs; WP pin hardens against accidental overwrite during field servicing. Use Value: Hardware write protection and low-voltage operation (1.7V) enable safe, reliable storage even during brown-out conditions. | Use Scenario: Utility meter records tariff schedules, firmware version history, and tamper-detection timestamps over 15+ year service life. IC Role / Device Role / Timing Role: AT24CS16-XHM-B serves as secure, long-life parameter store interfaced directly to 3.3V metrology SoC via I²C. Use Value: 400 kHz I²C speed and 6 µA standby current minimize communication latency and extend battery backup duration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C16D-SSHM-T | Same 16-Kbit density and I²C interface, but lacks factory-programmed serial number; uses standard AT24C addressing (1010b prefix) | No built-in device identity - requires external serialization or MCU-based ID management | Select when serial number functionality is unnecessary and cost sensitivity outweighs traceability benefits |
| M95160-DFMN6TP | 16-Kbit SPI EEPROM (not I²C); operates 1.8–5.5V; no factory serial number; 5 ms max write cycle | Requires SPI interface redesign; incompatible bus protocol prevents drop-in replacement | Choose only if system already uses SPI peripherals and board layout allows rework for different pinout and protocol stack |
Compared with AT24C16D-SSHM-T, the AT24CS16-XHM-B adds irreplaceable device identity without sacrificing endurance or voltage range; versus M95160-DFMN6TP, it preserves I²C compatibility and simplifies firmware integration while delivering guaranteed uniqueness for secure boot or anti-counterfeiting workflows.
Availability
AT24CS16-XHM-B is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, smart energy metering, secure device authentication, and portable instrumentation requiring stable component supply and long-term lifecycle assurance.
Supply support for AT24CS16-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory solutions, with ISO 9001-certified manufacturing and global distribution.
The AT24CS16-XHM-B belongs to Microchip's CS Series Serial EEPROM product line, designed specifically to deliver factory-assured device identity alongside reliable nonvolatile storage for secure and traceable electronic systems.
FAQ
What is the factory-programmed serial number feature of the AT24CS16-XHM-B?
The AT24CS16-XHM-B includes a permanently programmed 128-bit serial number written during wafer fabrication and locked against modification. This value resides in a dedicated memory region outside the 16-Kbit user EEPROM array, ensuring no capacity loss. Uniqueness is guaranteed across all Microchip CS Series EEPROMs - including variants with different densities or interfaces - enabling system-level traceability without post-production programming.
Does the AT24CS16-XHM-B support 1 MHz I²C communication?
Yes, the AT24CS16-XHM-B supports Fast Mode Plus (FM+) at up to 1 MHz, but only when VCC is between 2.5V and 5.5V. At lower voltages (1.7V–2.5V), it operates in Fast Mode (400 kHz) or Standard Mode (100 kHz). The AC timing specifications - including tLOW (500 ns min), tHIGH (400 ns min), and tR/tF (≤300 ns) - are fully characterized for 1 MHz operation and must be met by the host controller and bus layout.
How does the WP pin function on the AT24CS16-XHM-B?
The WP (Write-Protect) pin on the AT24CS16-XHM-B is an active-high hardware control: when driven to VCC (≥0.7×VCC), it inhibits all write operations to the entire EEPROM array. When tied to GND or left floating, the internal strong pull-down engages and enables normal writes. Microchip recommends connecting WP to a defined logic level - not leaving it floating - to prevent noise-induced protection glitches in electrically noisy environments.
What is the maximum write cycle time for the AT24CS16-XHM-B?
The AT24CS16-XHM-B guarantees a maximum self-timed write cycle duration of 5 ms for both byte and page writes, as specified in the datasheet (DS20006342A, Table 4-3). This value is independent of VCC and temperature within rated operating conditions. During this period, the device does not acknowledge I²C address calls - host firmware must implement acknowledge polling or fixed-delay waits before issuing subsequent commands.
Is the AT24CS16-XHM-B compatible with 1.8V I²C systems?
Yes, the AT24CS16-XHM-B is fully compatible with 1.8V I²C systems: its VCC range starts at 1.7V, and it supports Standard Mode (100 kHz) and Fast Mode (400 kHz) across the full 1.7V–5.5V range. Input thresholds (VIL ≤0.3×VCC, VIH ≥0.7×VCC) and output drive strength (VOL ≤0.2V at 0.15 mA, 1.7V) meet I²C specification requirements at 1.8V, provided external pull-up resistors are sized appropriately (e.g., 4 kΩ for 400 kHz).
AT24CS16-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:
- 16Kbit
- Memory Organization:
- 2K 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
AT24CS16-XHM-B FAQ
1.How can I place an order for AT24CS16-XHM-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT24CS16-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 AT24CS16-XHM-B reliable?
The price and inventory of AT24CS16-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 AT24CS16-XHM-B is usually 5 days.
3.What payment methods are accepted for AT24CS16-XHM-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT24CS16-XHM-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT24CS16-XHM-B?
AT24CS16-XHM-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT24CS16-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 AT24CS16-XHM-B?
For technical support, including AT24CS16-XHM-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT24CS16-XHM-B requirements.
6.How does Aetrix verify that AT24CS16-XHM-B is sourced from the original manufacturer or authorized distributors?
All AT24CS16-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 AT24CS16-XHM-B meets industry standards.
7.What is the process for return or replacement of AT24CS16-XHM-B?
All AT24CS16-XHM-B units undergo pre-shipment inspection (PSI). If there is an issue with AT24CS16-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 AT24CS16-XHM-B part is unused and in its original packaging.
Return procedure for AT24CS16-XHM-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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